CS FALLBACK PARAMETER

eRAN TDD

CS Fallback Feature ParameterDescription

Issue 02

Date 2016-04-20

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2016. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent of Huawei Technologies Co., Ltd. Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.All other trademarks and trade names mentioned in this document are the property of their respectiveholders. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees orrepresentations of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute a warranty of any kind, express or implied.

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Issue 02 (2016-04-20) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd.

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mailto:[email protected]

Contents

1 About This Document.................................................................................................................. 11.1 Scope.............................................................................................................................................................................. 11.2 Intended Audience..........................................................................................................................................................21.3 Change History............................................................................................................................................................... 21.4 Differences Between eNodeB Types.............................................................................................................................. 5

2 Overview......................................................................................................................................... 62.1 Introduction.................................................................................................................................................................... 72.2 Benefits...........................................................................................................................................................................72.3 Application Scenarios.....................................................................................................................................................72.4 CSFB Mechanisms......................................................................................................................................................... 92.4.1 CSFB to UTRAN.......................................................................................................................................................102.4.2 CSFB to GERAN.......................................................................................................................................................11

3 CSFB to UTRAN.......................................................................................................................... 143.1 Overview...................................................................................................................................................................... 153.2 Feature Description.......................................................................................................................................................163.2.1 TDLOFD-001033 CS FallBack to UTRAN..............................................................................................................163.2.2 TDLOFD-001052 Flash CS Fallback to UTRAN.....................................................................................................163.2.3 TDLOFD-081223 Ultra-Flash CSFB to UTRAN..................................................................................................... 173.2.4 TDLOFD-001068 CS Fallback with LAI to UTRAN...............................................................................................173.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering.......................................................................................193.2.6 TDLOFD-001088 CS Fallback Steering to UTRAN................................................................................................ 213.2.7 Load-based CSFB to UTRAN...................................................................................................................................233.3 Triggering Events......................................................................................................................................................... 233.4 Target Cell/Frequency Selection...................................................................................................................................243.5 Decision........................................................................................................................................................................ 303.5.1 Basic Decision Method..............................................................................................................................................313.5.2 Decision Based on System Information.................................................................................................................... 323.6 Execution...................................................................................................................................................................... 333.6.1 CSFB Policy Selection.............................................................................................................................................. 333.6.2 Redirection-based CSFB Optimization for UEs in Idle Mode.................................................................................. 363.6.3 CSFB Admission Optimization for UEs in Idle Mode..............................................................................................373.6.4 Retry and Penalty.......................................................................................................................................................37

eRAN TDDCS Fallback Feature Parameter Description Contents


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3.7 RIM Procedure Between E-UTRAN and UTRAN...................................................................................................... 373.7.1 RIM Procedure Through the Core Network.............................................................................................................. 383.7.2 RIM Procedure Through the eCoordinator................................................................................................................40

4 CSFB to GERAN.......................................................................................................................... 424.1 Overview...................................................................................................................................................................... 434.2 Feature Description.......................................................................................................................................................434.2.1 TDLOFD-001034 CS Fallback to GERAN...............................................................................................................434.2.2 TDLOFD-001053 Flash CSFB to GERAN...............................................................................................................454.2.3 TDLOFD-001069 CS Fallback with LAI to GERAN...............................................................................................454.2.4 TDLOFD-001089 CS Fallback Steering to GERAN................................................................................................ 454.2.5 TDLOFD-081203 Ultra-Flash CSFB to GERAN..................................................................................................... 464.3 Triggering..................................................................................................................................................................... 474.4 Target Cell/Frequency Selection...................................................................................................................................474.5 Decision........................................................................................................................................................................ 484.6 Execution...................................................................................................................................................................... 484.7 RIM Procedure Between E-UTRAN and GERAN...................................................................................................... 50

5 Handover and CSFB Procedure Conflict Optimization.......................................................52

6 Related Features...........................................................................................................................536.1 Features Related to TDLOFD-001033 CS FallBack to UTRAN................................................................................. 536.2 Features Related to TDLOFD-001052 Flash CS Fallback to UTRAN........................................................................ 546.3 Features Related to TDLOFD-081223 Ultra-Flash CSFB to UTRAN........................................................................ 546.4 Features Related to TDLOFD-001068 CS Fallback with LAI to UTRAN..................................................................556.5 Features Related to TDLOFD-001088 CS Fallback Steering to UTRAN................................................................... 556.6 Features Related to TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering.......................................................... 566.7 Features Related to TDLOFD-001034 CS Fallback to GERAN..................................................................................566.8 Features Related to TDLOFD-001053 Flash CSFB to GERAN..................................................................................576.9 Features Related to TDLOFD-081203 Ultra-Flash CSFB to GERAN........................................................................ 576.10 Features Related to TDLOFD-001069 CS Fallback with LAI to GERAN................................................................586.11 Features Related to TDLOFD-001089 CS Fallback Steering to GERAN..................................................................58

7 Network Impact........................................................................................................................... 607.1 TDLOFD-001033 CS FallBack to UTRAN.................................................................................................................607.2 TDLOFD-001052 Flash CS Fallback to UTRAN........................................................................................................617.3 TDLOFD-081223 Ultra-Flash CSFB to UTRAN........................................................................................................ 617.4 TDLOFD-001068 CS Fallback with LAI to UTRAN..................................................................................................627.5 TDLOFD-001088 CS Fallback Steering to UTRAN................................................................................................... 627.6 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering..........................................................................................627.7 TDLOFD-001034 CS Fallback to GERAN..................................................................................................................637.8 TDLOFD-001053 Flash CSFB to GERAN..................................................................................................................637.9 TDLOFD-081203 Ultra-Flash CSFB to GERAN........................................................................................................ 647.10 TDLOFD-001069 CS Fallback with LAI to GERAN................................................................................................647.11 TDLOFD-001089 CS Fallback Steering to GERAN................................................................................................. 64



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8 Engineering Guidelines............................................................................................................. 658.1 TDLOFD-001033 CS Fallback to UTRAN..................................................................................................................658.1.1 When to Use CS Fallback to UTRAN.......................................................................................................................658.1.2 Required Information................................................................................................................................................ 658.1.3 Requirements............................................................................................................................................................. 668.1.4 Precautions.................................................................................................................................................................678.1.5 Data Preparation and Feature Activation...................................................................................................................678.1.5.1 Data Preparation..................................................................................................................................................... 678.1.5.2 Using the CME....................................................................................................................................................... 748.1.5.3 Using MML Commands.........................................................................................................................................758.1.6 Activation Observation..............................................................................................................................................798.1.7 Deactivation...............................................................................................................................................................858.1.7.1 Using the CME....................................................................................................................................................... 858.1.7.2 Using MML Commands.........................................................................................................................................858.1.8 Performance Monitoring............................................................................................................................................868.1.9 Parameter Optimization.............................................................................................................................................878.2 RIM Procedure from E-UTRAN to UTRAN............................................................................................................... 918.2.1 When to Use RIM Procedure from E-UTRAN to UTRAN...................................................................................... 918.2.2 Required Information................................................................................................................................................ 918.2.3 Requirements............................................................................................................................................................. 918.2.4 Precautions.................................................................................................................................................................928.2.5 Data Preparation and Feature Activation...................................................................................................................928.2.5.1 Data Preparation..................................................................................................................................................... 928.2.5.2 Using the CME....................................................................................................................................................... 938.2.5.3 Using MML Commands.........................................................................................................................................938.2.6 Activation Observation..............................................................................................................................................938.2.7 Deactivation...............................................................................................................................................................958.2.7.1 Using the CME....................................................................................................................................................... 958.2.7.2 Using MML Commands.........................................................................................................................................958.2.8 Performance Monitoring............................................................................................................................................958.2.9 Parameter Optimization.............................................................................................................................................958.3 TDLOFD-001052 Flash CS Fallback to UTRAN........................................................................................................958.3.1 When to Use Flash CS Fallback to UTRAN............................................................................................................. 968.3.2 Required Information................................................................................................................................................ 968.3.3 Requirements............................................................................................................................................................. 978.3.4 Precautions.................................................................................................................................................................978.3.5 Data Preparation and Feature Activation...................................................................................................................978.3.5.1 Data Preparation..................................................................................................................................................... 978.3.5.2 Using the CME..................................................................................................................................................... 1018.3.5.3 Using MML Commands.......................................................................................................................................1018.3.6 Activation Observation............................................................................................................................................1028.3.7 Deactivation.............................................................................................................................................................103



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8.3.7.1 Using the CME..................................................................................................................................................... 1048.3.7.2 Using MML Commands.......................................................................................................................................1048.3.8 Performance Monitoring..........................................................................................................................................1048.3.9 Parameter Optimization...........................................................................................................................................1048.4 TDLOFD-081223 Ultra-Flash CSFB to UTRAN...................................................................................................... 1048.4.1 When to Use Ultra-Flash CSFB to UTRAN........................................................................................................... 1048.4.2 Required Information.............................................................................................................................................. 1048.4.3 Requirements........................................................................................................................................................... 1058.4.4 Precautions...............................................................................................................................................................1058.4.5 Data Preparation and Feature Activation.................................................................................................................1058.4.5.1 Data Preparation................................................................................................................................................... 1058.4.5.2 Using the CME..................................................................................................................................................... 1078.4.5.3 Using MML Commands.......................................................................................................................................1078.4.6 Activation Observation............................................................................................................................................1088.4.7 Deactivation............................................................................................................................................................. 1118.4.7.1 Using the CME..................................................................................................................................................... 1118.4.7.2 Using MML Commands....................................................................................................................................... 1118.4.8 Performance Monitoring..........................................................................................................................................1118.4.9 Parameter Optimization........................................................................................................................................... 1128.5 TDLOFD-001068 CS Fallback with LAI to UTRAN................................................................................................ 1128.5.1 When to Use CS Fallback with LAI to UTRAN..................................................................................................... 1128.5.2 Required Information...............................................................................................................................................1128.5.3 Requirements........................................................................................................................................................... 1148.5.4 Precautions...............................................................................................................................................................1148.5.5 Data Preparation and Feature Activation.................................................................................................................1148.5.5.1 Data Preparation................................................................................................................................................... 1148.5.5.2 Using the CME..................................................................................................................................................... 1148.5.5.3 Using MML Commands....................................................................................................................................... 1148.5.6 Activation Observation............................................................................................................................................ 1148.5.7 Deactivation............................................................................................................................................................. 1158.5.8 Performance Monitoring..........................................................................................................................................1158.5.9 Parameter Optimization........................................................................................................................................... 1158.6 TDLOFD-001088 CS Fallback Steering to UTRAN................................................................................................. 1158.6.1 When to Use CS Fallback Steering to UTRAN.......................................................................................................1158.6.2 Required Information...............................................................................................................................................1168.6.3 Requirements........................................................................................................................................................... 1168.6.4 Precautions...............................................................................................................................................................1178.6.5 Data Preparation and Feature Activation.................................................................................................................1178.6.5.1 Data Preparation................................................................................................................................................... 1178.6.5.2 Using the CME..................................................................................................................................................... 1228.6.5.3 Using MML Commands.......................................................................................................................................1228.6.6 Activation Observation............................................................................................................................................124



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8.6.7 Deactivation.............................................................................................................................................................1248.6.7.1 Using the CME..................................................................................................................................................... 1258.6.7.2 Using MML Commands.......................................................................................................................................1258.6.8 Performance Monitoring..........................................................................................................................................1258.6.9 Parameter Optimization...........................................................................................................................................1258.7 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering........................................................................................1258.7.1 When to Use E-UTRAN to UTRAN CS/PS Steering............................................................................................. 1258.7.2 Required Information.............................................................................................................................................. 1268.7.3 Requirements........................................................................................................................................................... 1268.7.4 Precautions...............................................................................................................................................................1268.7.5 Data Preparation and Feature Activation.................................................................................................................1278.7.5.1 Data Preparation................................................................................................................................................... 1278.7.5.2 Using the CME..................................................................................................................................................... 1288.7.5.3 Using MML Commands.......................................................................................................................................1298.7.6 Activation Observation............................................................................................................................................1298.7.7 Deactivation.............................................................................................................................................................1308.7.7.1 Using the CME..................................................................................................................................................... 1308.7.7.2 Using MML Commands.......................................................................................................................................1308.7.8 Performance Monitoring..........................................................................................................................................1318.7.9 Parameter Optimization...........................................................................................................................................1318.8 TDLOFD-001034 CS Fallback to GERAN................................................................................................................1318.8.1 When to Use CS Fallback to GERAN.....................................................................................................................1318.8.2 Required Information.............................................................................................................................................. 1318.8.3 Requirements........................................................................................................................................................... 1328.8.4 Precautions...............................................................................................................................................................1338.8.5 Data Preparation and Feature Activation.................................................................................................................1338.8.5.1 Data Preparation................................................................................................................................................... 1338.8.5.2 Using the CME..................................................................................................................................................... 1398.8.5.3 Using MML Commands.......................................................................................................................................1398.8.6 Activation Observation............................................................................................................................................1458.8.7 Deactivation.............................................................................................................................................................1488.8.7.1 Using MML Commands.......................................................................................................................................1488.8.8 Performance Monitoring..........................................................................................................................................1488.8.9 Parameter Optimization...........................................................................................................................................1508.9 RIM Procedure from E-UTRAN to GERAN............................................................................................................. 1518.9.1 When to Use RIM Procedure from E-UTRAN to GERAN.................................................................................... 1518.9.2 Required Information.............................................................................................................................................. 1528.9.3 Requirements........................................................................................................................................................... 1528.9.4 Precautions...............................................................................................................................................................1528.9.5 Data Preparation and Feature Activation.................................................................................................................1528.9.5.1 Data Preparation................................................................................................................................................... 1538.9.5.2 Using the CME..................................................................................................................................................... 153



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8.9.5.3 Using MML Commands.......................................................................................................................................1538.9.6 Activation Observation............................................................................................................................................1548.9.7 Deactivation.............................................................................................................................................................1558.9.7.1 Using the CME..................................................................................................................................................... 1558.9.7.2 Using MML Commands.......................................................................................................................................1558.9.8 Performance Monitoring..........................................................................................................................................1568.9.9 Parameter Optimization...........................................................................................................................................1568.10 TDLOFD-001053 Flash CSFB to GERAN..............................................................................................................1568.10.1 When to Use Flash CS Fallback to GERAN......................................................................................................... 1568.10.2 Required Information............................................................................................................................................ 1568.10.3 Requirements......................................................................................................................................................... 1578.10.4 Precautions.............................................................................................................................................................1588.10.5 Data Preparation and Feature Activation...............................................................................................................1588.10.5.1 Data Preparation................................................................................................................................................. 1588.10.5.2 Using the CME................................................................................................................................................... 1628.10.5.3 Using MML Commands.....................................................................................................................................1628.10.6 Activation Observation..........................................................................................................................................1638.10.7 Deactivation...........................................................................................................................................................1648.10.7.1 Using the CME................................................................................................................................................... 1658.10.7.2 Using MML Commands.....................................................................................................................................1658.10.8 Performance Monitoring........................................................................................................................................1658.10.9 Parameter Optimization.........................................................................................................................................1658.11 TDLOFD-081203 Ultra-Flash CSFB to GERAN.................................................................................................... 1658.11.1 When to Use Ultra-Flash CSFB to GERAN..........................................................................................................1658.11.2 Required Information.............................................................................................................................................1658.11.3 Requirements......................................................................................................................................................... 1668.11.4 Precautions.............................................................................................................................................................1668.11.5 Data Preparation and Feature Activation...............................................................................................................1668.11.5.1 Data Preparation................................................................................................................................................. 1668.11.5.2 Using the CME................................................................................................................................................... 1708.11.5.3 Using MML Commands..................................................................................................................................... 1708.11.6 Activation Observation.......................................................................................................................................... 1718.11.7 Deactivation........................................................................................................................................................... 1728.11.7.1 Using the CME................................................................................................................................................... 1738.11.7.2 Using MML Commands..................................................................................................................................... 1738.11.8 Performance Monitoring........................................................................................................................................1738.11.9 Parameter Optimization......................................................................................................................................... 1738.12 TDLOFD-001069 CS Fallback with LAI to GERAN..............................................................................................1748.12.1 When to Use CS Fallback with LAI to GERAN................................................................................................... 1748.12.2 Required Information............................................................................................................................................ 1748.12.3 Requirements......................................................................................................................................................... 1758.12.4 Precautions.............................................................................................................................................................175



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8.12.5 Data Preparation and Feature Activation...............................................................................................................1768.12.5.1 Data Preparation................................................................................................................................................. 1768.12.5.2 Using the CME................................................................................................................................................... 1768.12.5.3 Using MML Commands.....................................................................................................................................1768.12.6 Activation Observation..........................................................................................................................................1768.12.7 Deactivation...........................................................................................................................................................1778.12.8 Performance Monitoring........................................................................................................................................1778.12.9 Parameter Optimization.........................................................................................................................................1778.13 TDLOFD-001089 CS Fallback Steering to GERAN............................................................................................... 1778.13.1 When to Use CS Fallback Steering to GERAN.................................................................................................... 1778.13.2 Required Information............................................................................................................................................ 1778.13.3 Requirements......................................................................................................................................................... 1788.13.4 Precautions.............................................................................................................................................................1788.13.5 Data Preparation and Feature Activation...............................................................................................................1788.13.5.1 Data Preparation................................................................................................................................................. 1788.13.5.2 Using the CME................................................................................................................................................... 1818.13.5.3 Using MML Commands.....................................................................................................................................1818.13.6 Activation Observation..........................................................................................................................................1828.13.7 Deactivation...........................................................................................................................................................1828.13.7.1 Using the CME................................................................................................................................................... 1838.13.7.2 Using MML Commands.....................................................................................................................................1838.13.8 Performance Monitoring........................................................................................................................................1838.13.9 Parameter Optimization.........................................................................................................................................1838.14 Troubleshooting........................................................................................................................................................ 1838.14.1 CSFB Calling Procedure Failure........................................................................................................................... 1838.14.2 eNodeB Receiving No Measurement Report........................................................................................................ 1848.14.3 CSFB Blind Handover Failure.............................................................................................................................. 1848.14.4 CSFB Handover Failure........................................................................................................................................ 185

9 Parameters...................................................................................................................................187

10 Counters.................................................................................................................................... 264

11 Glossary.....................................................................................................................................300

12 Reference Documents............................................................................................................. 301

13 Appendix...................................................................................................................................30213.1 Signaling Procedures Involved in CSFB to UTRAN............................................................................................... 30213.1.1 Combined EPS/IMSI Attach Procedure................................................................................................................ 30213.1.2 CSFB Based on PS Handover............................................................................................................................... 30313.1.3 CSFB Based on Redirection.................................................................................................................................. 30513.1.4 Flash CSFB............................................................................................................................................................30713.1.5 Ultra-Flash CSFB to UTRAN............................................................................................................................... 30813.1.6 Redirection-based CSFB Optimization for UEs in Idle Mode.............................................................................. 311



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13.1.7 Signaling Procedures for SMS...............................................................................................................................31113.1.8 Emergency Call..................................................................................................................................................... 31213.1.9 CSFB for LCS....................................................................................................................................................... 31213.2 Signaling Procedures Involved in CSFB to GERAN............................................................................................... 31213.2.1 Combined EPS/IMSI Attach Procedure................................................................................................................ 31213.2.2 CSFB Based on PS Handover............................................................................................................................... 31313.2.3 CSFB Based on CCO/NACC................................................................................................................................ 31413.2.4 CSFB Based on Redirection.................................................................................................................................. 31613.2.5 Flash CSFB............................................................................................................................................................31713.2.6 Ultra-Flash CSFB to GERAN............................................................................................................................... 31913.2.7 Signaling Procedures for SMS.............................................................................................................................. 32113.2.8 Emergency Call..................................................................................................................................................... 32113.2.9 CSFB for LCS....................................................................................................................................................... 321



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1 About This Document

1.1 ScopeThis document describes circuit switched fallback (CSFB), including its technical principles,related features, network impact, and engineering guidelines.

This document covers the following features:

l TDLOFD-001033 CS Fallback to UTRANl TDLOFD-001052 Flash CSFB to UTRANl TDLOFD-081223 Ultra-Flash CSFB to UTRANl TDLOFD-001068 CS Fallback with LAI to UTRANl TDLOFD-001088 CS Fallback Steering to UTRANl TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steeringl TDLOFD-001034 CS Fallback to GERANl TDLOFD-001053 Flash CSFB to GERANl TDLOFD-001069 CS Fallback with LAI to GERANl TDLOFD-001089 CS Fallback Steering to GERANl TDLOFD-081203 Ultra-Flash CSFB to GERAN

This document mainly describes CSFB implementation principles on the E-UTRAN. IfHuawei devices are used in the GERAN or UTRAN to which CS fallback is performed, referto the following documents to obtain details about CSFB implementation in the correspondingnetwork:

l For the GERAN, see CS Fallback Feature Parameter Description in GBSS FeatureDocumentation.

l For the UTRAN, see Interoperability Between UMTS and LTE Feature ParameterDescription in RAN Feature Documentation.

Any managed objects (MOs), parameters, alarms, or counters described herein correspond tothe software release delivered with this document. Any future updates will be described in theproduct documentation delivered with future software releases.

This document applies only to LTE TDD. Any "LTE" in this document refers to LTE TDD,and "eNodeB" refers to LTE TDD eNodeB.

eRAN TDDCS Fallback Feature Parameter Description 1 About This Document


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This document applies to the following types of eNodeBs.

eNodeB Type Model

Macro DBS3900 LTE TDD

LampSite DBS3900 LampSite TDD

Micro BTS3205E

1.2 Intended AudienceThis document is intended for personnel who:

l Need to understand the features described herein

l Work with Huawei products

1.3 Change HistoryThis section provides information about the changes in different document versions. There aretwo types of changes:

l Feature change

Changes in features and parameters of a specified version as well as the affected entities

l Editorial change

Changes in wording or addition of information and any related parameters affected byeditorial changes. Editorial change does not specify the affected entities.

eRAN TDD 11.1 02 (2016-04-20)

This issue includes the following changes.

ChangeType

Change Description ParameterChange

AffectedEntity

Featurechange

None None None

Editorialchange

Revised descriptions in thedocument.

None N/A

eRAN TDD 11.1 Draft A (2015-12-30)

Compared with Issue 01 (2015-09-20) of eRAN TDD 11.0, Draft A (2015-12-30) of eRANTDD 11.1 includes the following changes.



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ChangeType

Change Description Parameter Change Affected Entity

Featurechange

Added the switch ofdisabling blind handoverto disable the blindhandover function of UEssupporting ultra-flashCSFB when the blindhandover function takeseffect. For details, see 3.3Triggering Events.

Added theUFCsfbBlindHoDisSwitch option of theCellHoParaCfg.HoModeSwitch parameter.

Macro, micro, andLampSite eNodeBs

Added the function ofdeleting inter-frequencymeasurements duringGERAN measurement.For details, see 4.3Triggering.

Added theCSFB_MEAS_DEL_INTERFREQ_SWoption of theCellAlgoSwitch.MeasOptAlgoSwitchparameter.


Added retry and penaltymechanisms for CSFB.For details, see 3.6.4Retry and Penalty and4.6 Execution.

None Macro, micro, andLampSite eNodeBs

Added the processingmechanism when theCSFB procedure conflictswith the handoverprocedure. The former ispreferentially processed.For details, see 5Handover and CSFBProcedure ConflictOptimization.

Added theCsfbFlowFirstSwitchoption of theGlobalProcSwitch.HoProcCtrlSwitchparameter.




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ChangeType


Added cell-level switchcontrol parameters to thefollowing features:l TDLOFD-001033 CS

Fallback to UTRANl TDLOFD-001052

Flash CS Fallback toUTRAN

l TDLOFD-001078 E-UTRAN to UTRANCS/PS Steering

l TDLOFD-001088 CSFallback Steering toUTRAN

l TDLOFD-001034 CSFallback to GERAN

l TDLOFD-001053Flash CS Fallback toGERAN

l TDLOFD-001089 CSFallback Steering toGERAN

Added the followingparameters:l UtranCsfbSwitch

option of theCellAlgoSwitch.HoAllowedSwitchparameter

l UtranFlashCsfbSwitch option of theCellAlgoSwitch.HoAllowedSwitchparameter

l UtranFreqLayerMeasSwitchoption of theCellAlgoSwitch.FreqLayerSwitchparameter

l UtranFreqLayerBlindSwitchoption of theCellAlgoSwitch.FreqLayerSwitchparameter

l UtranCsfbSteeringSwitch option oftheCellAlgoSwitch.HoAllowedSwitchparameter

l GeranCsfbSwitchoption of theCellAlgoSwitch.HoAllowedSwitchparameter

l GeranFlashCsfbSwitch option of theCellAlgoSwitch.HoAllowedSwitchparameter

l GeranCsfbSteeringSwitch optionof theCellAlgoSwitch.HoAllowedSwitchparameter




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ChangeType


Editorialchange

Revised descriptions inthe document.

None N/A

Revised the descriptionsof CME-based featureconfiguration inengineering guidelines.

None N/A

1.4 Differences Between eNodeB TypesThe features described in this document are implemented in the same way on macro, micro,and LampSite eNodeBs.



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2 Overview

In an early phase of evolved packet system (EPS) construction, operators who own a matureUTRAN or GERAN can protect their investments in legacy CS networks and reduce theirinvestments in the EPS by using the legacy UTRAN or GERAN to provide CS services.

Currently, CSFB and voice over IP (VoIP) over IP multimedia subsystem (IMS) are the twostandard solutions to provide voice services for UEs on LTE networks. After the technologicalmaturity, industry chain, and deployment costs of the two methods are well weighed, CSFB ischosen to serve as an interim solution for voice service access before mature commercial useof IMS.

eRAN TDDCS Fallback Feature Parameter Description 2 Overview


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2.1 IntroductionWith the CSFB solution, when a UE initiates a CS service, the mobility management entity(MME) instructs the UE to fall back to a legacy CS network before the UE performs theservice. CSFB is a session setup procedure. The UE falls back to the CS network before theCS session is set up, and it stays in the CS network during the CS session. For details, see3GPP TS 23.272 V8.5.0.

After receiving CS Fallback Indicator, eNodeBs handle CSFB for different types of CSservices in a uniform way. The CS services can be voice services, short message service(SMS), location service (LCS), and emergency calls.

2.2 BenefitsCSFB offers the following benefits:

l Facilitates voice services for LTE networks.l Helps operators reduce costs by reusing legacy CS networks with no need to deploy an

IMS network.

2.3 Application ScenariosCSFB can be used when the CS network of the UTRAN/GERAN has the same or largercoverage area than that of the E-UTRAN.

Figure 2-1 shows the network architecture for CSFB to UTRAN/GERAN.

Figure 2-1 Network architecture for CSFB to UTRAN/GERAN

Table 2-1 describes the elements of the network architecture in Figure 2-1.



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Table 2-1 Elements of the network architecture for CSFB to UTRAN/GERAN

Element Function

SGs interface l Is an interface between the MME and the mobile switching center(MSC) server.

l Assists mobility management and paging between the EPS and theCS network.

l Transmits mobile originated (MO) and mobile terminated (MT)SMS messages.

l Transmits messages related to combined attach and combined TAU/LAU. (TAU is short for tracking area update, and LAU is short forlocation area update.)

UE l Is capable of accessing the EPS and accessing the UTRAN,GERAN, or both.

l Supports combined EPS/IMSI (IMSI is short for internationalmobile subscriber identity) attach, combined EPS/IMSI detach, andcombined TAU/LAU.

l Supports CSFB mechanisms, such as redirection and handover.NOTE

CSFB-capable UEs must support SMS over SGs, but UEs that support SMS overSGs are not necessarily CSFB-capable.

MME l Supports the SGs interface to the MSC/VLR.l Selects the VLR and location area identity (LAI) based on the

tracking area identity (TAI) of the serving cell.l Forwards paging messages delivered by the MSC.l Performs public land mobile network (PLMN) selection and

reselection.l Supports combined EPS/IMSI attach, combined EPS/IMSI detach,

and combined TAU/LAU.l Routes CS signaling.l Supports SMS over SGs.l Supports RAN information management (RIM), which is required

when flash CSFB or CCO with NACC is used as the CSFBmechanism. (CCO is short for cell change order and NACC is shortfor network assisted cell change.)

MSC l Supports combined EPS/IMSI attach.l Supports SMS over SGs.l Forwards paging messages transmitted through the SGs interface.



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Element Function

E-UTRAN l Forwards paging messages related to CSFB.l Selects target cells for CSFB.l Supports one or more of the following functions:

– PS redirection to UTRAN or GERAN, if PS redirection is usedas the CSFB mechanism.

– PS handover to UTRAN or GERAN, if PS handover is used asthe CSFB mechanism.

– CCO to GERAN, if CCO is used as the CSFB mechanism.– RIM for acquiring the system information of GERAN cells, if

NACC is used as the CSFB mechanism.– RIM for acquiring the system information of UTRAN or

GERAN cells, in addition to PS redirection, if flash CSFB isused as the CSFB mechanism.

UTRAN/GERAN

Supports one or more of the following functions:l Incoming handovers from the E-UTRAN, if PS handover is used as

the CSFB mechanism.l RIM for delivering the system information of GERAN cells to

eNodeBs, if NACC is used as the CSFB mechanism.l RIM for delivering the system information of UTRAN or GERAN

cells to eNodeBs, in addition to PS redirection, if flash CSFB isused as the CSFB mechanism.

NOTEThe UTRAN and GERAN do not need to provide extra functions to support PSredirection. The GERAN does not need to provide extra functions to supportCCO.

SGSN l Supports the follow-up procedures performed for PS handovers,including data forwarding, path switching, RAU, authentication,and encryption.

l Supports RIM, which is required when flash CSFB or CCO withNACC is used as the CSFB mechanism.

eCoordinator Is a network element provided by Huawei, and is optional. TheeCoordinator supports information exchange during RIM procedures.

To implement CSFB to provide CS services for E-UTRAN, all MSCs that serve overlappingareas with the E-UTRAN coverage must be upgraded to support functions involving the SGsinterfaces between MSCs and MMEs. These functions include combined attach, combinedTAU/LAU, paging, and SMS. If the live network uses an MSC pool, only one or multipleMSCs in the MSC pool need to be upgraded to support the SGs interface.

2.4 CSFB Mechanisms



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2.4.1 CSFB to UTRANBased on the capabilities of UEs and networks, three fallback mechanisms are available for aneNodeB to perform CSFB to UTRAN:

l R8 PS redirection

After receiving a CS Fallback Indicator, the eNodeB sends the UE an RRC ConnectionRelease message that contains frequency information about the target UTRAN. Based on thereceived frequency information, the UE searches for a UTRAN cell, reads the systeminformation of the UTRAN cell, and initiates initial access and CS sservice setup.

l R9 PS redirection (flash CSFB)

After receiving a CS Fallback Indicator, the eNodeB sends the UE an RRC ConnectionRelease message that contains information about a target UTRAN frequency as well assystem information about multiple cells on the frequency. Based on the received frequencyinformation, the UE searches for a UTRAN cell. As the UE has obtained the systeminformation about the target cell, the UE directly initiates initial access and CS service setupin the target cell, reducing voice delay.

l PS handover

The UE is handed over to the UTRAN through a PS handover procedure between the eNodeBand the UTRAN. After the handover, the UE initiates CS service setup in the target cell.

Table 2-2 describes the requirements of the three CSFB mechanisms on the network side andUEs.

Table 2-2 Requirements of CSFB to UTRAN for networks and UEs

Element R8 PS Redirection R9 PS Redirection(Flash CSFB)

PS Handover

UE l Support combinedEPS/CS attach andcombined TAU/LAU.

l Support CSFB by PSredirection.

l Support R9 PSredirection with SIB.

l The otherrequirements are thesame as those of R8PS redirection.

l Support PShandover.

l The otherrequirements arethe same as thoseof R8 PSredirection.

eNodeB Support CSFB by R8 PSredirection.

l Support the RIMprocedure.


Support PS handover.

UTRAN N/A Support the RIMprocedure.

Support PS Handover.



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Element R8 PS Redirection R9 PS Redirection(Flash CSFB)

PS Handover

MME l Support combinedEPS/CS attach andcombined TAU/LAU.

l Support the CSFBprocedure.

l Support the RIMprocedure.



SGSN N/A Support the RIMprocedure.


MSC l Support combinedEPS/CS attach andcombined TAU/LAU.

l Support the CSFBprocedure.

The requirements are thesame as those of R8 PSredirection.

The requirements arethe same as those ofR8 PS redirection.

2.4.2 CSFB to GERANBased on the capabilities of UEs and networks, five fallback mechanisms are available for aneNodeB to perform CSFB to GERAN:

l R8 PS redirection

For details, see 2.4.1 CSFB to UTRAN.

l R9 PS redirection (flash CSFB)


l CCO

After receiving a CS Fallback Indicator, the eNodeB sends the UE aMobilityFromEUTRACommand message that contains a target GERAN cell, instructing theUE to access the cell. The UE must acquire synchronization with the cell and read systeminformation about the cell before it can access the cell to initiate a CS service.

l CCO with NACC

If NACC is enabled, the RIM procedure is started during CCO from E-UTRAN to GERAN.With this procedure, the eNodeB acquires system information about the target cell anddelivers it to the UE. The UE accesses the target cell to initiate a CS service with no need toread the system information, reducing the delay.

l PS handover


Table 2-3 describes the requirements of the five CSFB mechanisms for networks and UEs.



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Table 2-3 Requirements of CSFB to GERAN for networks and UEs

Element

R8 PSRedirection

R9 PSRedirection(Flash CSFB)

CCO CCO withNACC

PSHandover

UE l SupportcombinedEPS/CSattach andcombinedTAU/LAU.

l SupportCSFB byPSredirection.

l Support R9PSredirectionwith SIB.

l The otherrequirementsare the sameas those ofR8 PSredirection.

l SupportCCO.

l Theotherrequirementsare thesame asthose ofR8 PSredirection.

l SupportNACC

l Theotherrequirements arethe sameas thoseof R8 PSredirection.

l SupportPShandover.

l Theotherrequirementsare thesame asthose ofR8 PSredirection.

eNodeB Support CSFBby R8 PSredirection.

l Support theRIMprocedure.


SupportCCO.

l Supportthe RIMprocedure.


Support PShandover.

GERAN N/A Support the RIMprocedure.

N/A Support theRIMprocedure.

Support PShandover.

MME l SupportcombinedEPS/CSattach andcombinedTAU/LAU.

l Support theCSFBprocedure.

l Support theRIMprocedure.


Therequirements are thesame asthose of R8PSredirection.

l Supportthe RIMprocedure.


Support PShandover.



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Element

R8 PSRedirection

R9 PSRedirection(Flash CSFB)

CCO CCO withNACC

PSHandover

SGSN N/A Support the RIMprocedure.

N/A Support theRIMprocedure.

Support PShandover.

MSC l SupportcombinedEPS/CSattach andcombinedTAU/LAU.

l Support theCSFBprocedure.

Therequirements arethe same asthose of R8 PSredirection.






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3 CSFB to UTRAN

This chapter describes each CSFB to UTRAN feature, CSFB procedure, and RIM procedurebetween E-UTRAN and UTRAN.

eRAN TDDCS Fallback Feature Parameter Description 3 CSFB to UTRAN


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3.1 OverviewCSFB to UTRAN can be implemented in different ways and includes the following featuresand functions:

l TDLOFD-001033 CS Fallback to UTRANl TDLOFD-001052 Flash CS Fallback to UTRANl TDLOFD-081223 Ultra-Flash CSFB to UTRANl TDLOFD-001068 CS Fallback with LAI to UTRANl TDLOFD-001088 CS Fallback Steering to UTRANl Load-based CSFB to UTRAN

CSFB Procedure

Figure 3-1 shows the CSFB to UTRAN procedure.

Figure 3-1 CSFB to UTRAN procedure

Measurement and Blind Handling

The eNodeB determines whether to trigger UTRAN measurements or blind handling forCSFB to UTRAN based on the status of the blind handover switch first.



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l If the switch is on, the eNodeB triggers a blind handling.l If the switch is off, the eNodeB checks the UE capability:

– If the UE supports UTRAN measurements, the eNodeB triggers inter-RATmeasurements.

– If the UE does not support UTRAN measurements, the eNodeB triggers blindhandling.

For details about the measurement and handover, see Overview of Mobility Management inConnected Mode Feature Parameter Description.

NOTE

Unless otherwise specified, blind handling includes PS HO, redirection, and fast redirection for CSFB toUTRAN and includes PS HO, CCO, NACC, redirection, and fast redirection for CSFB to GERAN inthis document.

3.2 Feature Description

3.2.1 TDLOFD-001033 CS FallBack to UTRANThis section describes the optional feature TDLOFD-001033 CS Fallback to UTRAN. Thisfeature is controlled by the UtranCsfbSwitch option of the cell-level parameterCellAlgoSwitch.HoAllowedSwitch.

NOTE

This feature is also controlled by the UtranCsfbSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to usethe cell-level parameter.

When a UE initiates a CS service in the E-UTRAN, the MME sends the eNodeB an S1-APmessage containing CS Fallback Indicator, instructing the eNodeB to transfer the UE with theCS service to a target network. For details about MOC and MTC signaling procedures, see13.1 Signaling Procedures Involved in CSFB to UTRAN.

3.2.2 TDLOFD-001052 Flash CS Fallback to UTRANThis section describes the optional feature TDLOFD-001033 Flash CS Fallback to UTRAN.This feature is controlled by the UtranFlashCsfbSwitch option of the cell-level parameterCellAlgoSwitch.HoAllowedSwitch.

NOTE

This feature is also controlled by the UtranFlashCsfbSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to usethe cell-level parameter.

This feature is an enhancement to the optional feature TDLOFD-001033 CS Fallback toUTRAN. After the two features are activated, the eNodeB obtains the system information of



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UTRAN cells through RIM procedures and then sends UEs the EUTRAN-to-UTRANredirection messages that contain the system information. In this way, the UEs access theUTRAN cells with no need to read the system information in the cells. This reduces theaccess delay. For details about how the UTRAN sends the system information to the eNodeBthrough RIM procedures, see Flash CS Fallback Based on RIM Feature ParameterDescription.

This feature requires that the eNodeB can obtain UTRAN cell information through the RIMprocedures and the networks and UEs involved should comply with 3GPP Release 9 or later.For details about the RIM procedure, see 3.7 RIM Procedure Between E-UTRAN andUTRAN.

Other procedures are the same as those for CS Fallback to UTRAN. For details, see 3.2.1TDLOFD-001033 CS FallBack to UTRAN.

3.2.3 TDLOFD-081223 Ultra-Flash CSFB to UTRANThis section describes the optional feature TDLOFD-081223 Ultra-Flash CSFB to UTRAN.The UtranUltraFlashCsfbSwitch option of the ENodeBAlgoSwitch.HoAlgoSwitchparameter specifies whether to enable this feature. This feature is a Huawei-proprietary one.To enable this feature, the MME, MSC, and RNC must be all provided by Huawei andsupport this feature. No IMS needs to be deployed.

When a UE initiates a CS service setup request in an LTE network that does not supportVoLTE, this feature enables the eNodeB to hand over the UE to the UTRAN through theSRVCC procedure. The procedure has CS resources on the UTRAN prepared in advance andomits certain protocol-defined signaling procedures during access to the UTRAN, shorteningthe CSFB delay by 1s and improving user experience significantly. For the detailed signalingprocedure, see 13.1.5 Ultra-Flash CSFB to UTRAN.

The measurement procedure and blind handling procedure for this feature are the same asthose described in 3.2.1 TDLOFD-001033 CS FallBack to UTRAN.

NOTE

If a UE does not support ultra-flash CSFB, a UE compatibility issue arises. To address this issue, selectthe UltraFlashCsfbComOptSw option of the GlobalProcSwitch.UeCompatSwitch parameter.

3.2.4 TDLOFD-001068 CS Fallback with LAI to UTRAN

Application Scenarios

This section describes the optional feature TDLOFD-001068 CS Fallback with LAI toUTRAN. This feature is under license control but not under switch controll .

This feature works in the following scenarios:

l In a multi-PLMN or national roaming scenarioAn LAI consists of a PLMN ID and a location area code (LAC). The PLMN IDidentifies the CS network that a UE has registered with and will fall back to.If the serving E-UTRAN cell has multiple neighboring UTRAN or GERAN cells withdifferent PLMN IDs or the serving PLMN differs from the target PLMN, the operatorcan use the CSFB with LAI function so that the UE will preferentially fall back to thePLMN indicated by the LAI.

l In a tracking area (TA) that overlaps multiple location areas (LAs)



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To prevent a further LAU after CSFB, the eNodeB selects a CSFB target cell with thesame LAC as that specified for the UE during attach. Therefore, the CSFB delay doesnot include the LAU time.

The eNodeB derives the LAI from an Initial Context Setup Req or UE Context Mod Reqmessage sent by the MME.

This feature is an enhancement to the optional feature TDLOFD-001033 CS Fallback toUTRAN. With this feature, the eNodeB selects frequencies or cells for measurement or blindhandling based on LAIs sent by the MME. The following describes target selection formeasurement and blind handling.

Handover Measurementl Selecting frequencies

During measurement configuration, the eNodeB selects only inter-RAT frequencies onwhich the PLMN ID of any neighboring cell is the same as that in the LAI received. Thefollow-up measurement procedure is similar to that in CS Fallback to UTRAN.

l Selecting neighboring cellsThe eNodeB additionally filters neighboring cells in the following order after receivingmeasurement reports from a UE:

a. Neighboring cells with PLMN IDs and LACs the same as those in the LAIb. Neighboring cells with PLMN IDs the same as that in the LAI but LACs different

from that in the LAI

If no frequency or neighboring cell can be selected based on the LAI, the process is thesame as that when no LAI is received.

Blind Handlingl Selecting frequencies

If no neighboring UTRAN cell is configured, the eNodeB preferentially selects theUTRAN frequencies whose PLMN ID is the same as that in the LAI. For details, see 3.3Triggering Events.If neighboring UTRAN cells are configured, the eNodeB preferentially selects theoperating UTRAN frequencies of the neighboring UTRAN cells whose PLMN ID is thesame as that in the LAI. The eNodeB then sorts the frequencies based on the blindhandover priorities of the neighboring cells and frequency priorities for connected-modeUEs. For details, see 3.3 Triggering Events.

l Selecting neighboring cellsThe neighboring cell selection sequence is controlled by theLaiCsfbBlindNCellSelSwitch option of the ENodeBAlgoSwitch.HoCommOptSwitchparameter.

NOTE

When the coverage of an E-UTRAN cell is not completely included in that of a neighboring cellwith a configured blind handover priority, you are advised to select the option, thereby ensuringthe CSFB success rate and reducing the delay.

When the option is selected, the selection sequence is as follows:

a. Neighboring cells with PLMN IDs the same as those in the LAIb. Neighboring cells with the highest blind-handover priority among a



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c. Neighboring cells with LACs the same as those in the LAI among b

When the option is cleared, the selection sequence is as follows:

a. Neighboring cells with PLMN IDs the same as those in the LAIb. Neighboring cells with LACs the same as those in the LAI among ac. Neighboring cells with the highest blind-handover priority among b

3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS SteeringThis section describes the CS steering function in the optional feature TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering. For details about the PS steering function in this feature,see Inter-RAT Mobility Management in Connected Mode Feature Parameter Description.

This feature can be used when service steering is required in a UTRAN with multipleUTRAN frequencies. By setting CS service priorities for UTRAN frequencies, the operatorcan achieve CSFB from E-UTRAN only to the UTRAN frequency that has the highest CSservice priority.

CS Steering in CSFBThis function is an enhancement to the CS Fallback to UTRAN feature. The enhancementsare as follows:

l Frequencies with the highest CS service priority are preferentially selected for inter-RATmeasurement on the UTRAN.This function is controlled by the UtranFreqLayerMeasSwitch option of the cell-levelparameter CellAlgoSwitch.FreqLayerSwitch.

NOTE

This function is also controlled by the UtranFreqLayerMeasSwitch option of the eNodeB-levelparameter ENodeBAlgoSwitch.FreqLayerSwtich.

The option of the cell-level parameter takes effect only when that option of the eNodeB-levelparameter is cleared.

The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised touse the cell-level parameter.

If this option is selected, the eNodeB preferentially selects frequencies with the highestCS service priority specified by the UtranNFreq.CsPriority parameter for measurement.A larger value of this parameter indicates a higher priority. If this parameter is set toPriority_0(Priority 0) for a frequency, the eNodeB does not select this frequency formeasurement. The follow-up measurement procedure is the same as that in CS Fallbackto UTRAN. For details, see 3.4 Target Cell/Frequency Selection.

l Frequencies with the highest CS service priority are preferentially selected for blindredirection, or cells on frequencies with the highest CS service priority are preferentiallyselected as the target cells of blind handovers.This function is controlled by the UtranFreqLayerBlindSwitch option of the cell-levelparameter CellAlgoSwitch.FreqLayerSwitch.



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NOTE

This function is also controlled by the UtranFreqLayerBlindSwitch option of the eNodeB-levelparameter ENodeBAlgoSwitch.FreqLayerSwtich.



If this option is selected, the eNodeB preferentially selects a frequency with the highestCS service priority specified by the UtranNFreq.CsPriority parameter or a cell on thefrequency for blind handling. A larger value of this parameter indicates a higher priority.If this parameter is set to Priority_0(Priority 0) for a frequency, this frequency is notinvolved in frequency prioritization. The follow-up blind handling procedure is the sameas that in CS Fallback to UTRAN. For details, see 3.4 Target Cell/Frequency Selection.

LAI-based CS Steering in CSFB

This function is an enhancement to the CS Fallback with LAI to UTRAN feature. Theenhancements are as follows:

l Enhancement in measurement

a. The eNodeB selects inter-RAT frequencies on which the PLMN ID of aneighboring cell is the same as the PLMN ID in the LAI.

b. Among the selected frequencies, the eNodeB selects frequencies with the highestCS service priority, which is specified by the UtranNFreq.CsPriority parameter.

c. The follow-up measurement procedure is the same as that in CS Fallback toUTRAN. For details, see 3.4 Target Cell/Frequency Selection.

The difference is that the eNodeB additionally sorts neighboring cells in the followingorder after receiving measurement reports from a UE:

a. Neighboring cells with PLMN IDs and LACs the same as those in the LAI

b. Neighboring cells with PLMN IDs the same as that in the LAI but LACs differentfrom that in the LAI

c. Neighboring cells with PLMN IDs the same as the serving PLMN ID of the UE

l Enhancement in blind handling

a. The eNodeB selects frequencies whose PLMN ID is the same as the PLMN ID inthe LAI.

b. Among the selected frequencies, the eNodeB selects frequencies with the highestCS service priority, which is specified by the UtranNFreq.CsPriority parameter.

c. The eNodeB selects a neighboring cell whose PLMN ID and LAC are the same asthose in the LAI.

d. If such a neighboring cell is unavailable, the eNodeB selects a neighboring cellwhose PLMN ID is the same as that in the LAI but LAC is different from that in theLAI.

e. The follow-up blind handling procedure is the same as that in CS Fallback toUTRAN. For details, see 3.4 Target Cell/Frequency Selection.



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3.2.6 TDLOFD-001088 CS Fallback Steering to UTRANThis section describes the optional feature TDLOFD-001088 CS Fallback Steering toUTRAN. This feature is controlled by the UtranCsfbSteeringSwitch option of the cell-levelparameter CellAlgoSwitch.HoAllowedSwitch.

NOTE

This feature is also controlled by the UtranCsfbSteeringSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.

The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.

The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to usethe cell-level parameter.

This feature is an enhancement to the optional feature TDLOFD-001033 CS Fallback toUTRAN. Operators can set target RATs for UEs in different states at the time when the UEsinitiate CS services. There are two types of UEs:

l CS-only UEIf the MME uses an INITIAL CONTEXT SETUP REQUEST message to send a CSFallback Indicator to the eNodeB, the eNodeB determines that the UE is in idle modewhen initiating the CS service. This UE is called a CS-only UE.

l CS+PS UEIf the MME uses a UE CONTEXT MODIFICATION REQUEST message to send a CSFallback Indicator to the eNodeB, the eNodeB determines that the UE is performing PSservices when initiating the CS service. This UE is called a CS+PS UE.

CS-Only UEThe eNodeB selects the target RAT based on the RAT priorities specified by the parameters inTable 3-1.

Table 3-1 Target RAT priority parameter list for CSFB of CS-only UEs

Target RAT Priority forCSFB of CS-only UEs

eNodeB-LevelParameter

Cell-Level Parameter

CSFB Highest priority InterRatfor Idle UE

CSFallBackBlind-HoCfg.IdleCsfbHighestPri

CellOpHoCfg.IdleCsfbHighestPri

CSFB Second priority InterRatfor Idle UE

CSFallBackBlind-HoCfg.IdleCsfbSecondPri

CellOpHoCfg.IdleCsfbSecondPri

CSFB Lowest priority InterRatfor Idle UE

CSFallBackBlind-HoCfg.IdleCsfbLowestPri

CellOpHoCfg.IdleCsfbLowestPri



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NOTE

Parameters in the CSFallBackBlindHoCfg MO are eNodeB-level. When you run ADD CNoperatorwith CnOperatorId configured to add an operator, parameters in the CSFallBackBlindHoCfg MO areautomatically set to default values. Cell-level parameters for inter-RAT handovers are configured byrunning ADD CELLOPHOCFG. When both CSFallBackBlindHoCfg and CellOpHoCfg areconfigured, CellOpHoCfg prevails.

The eNodeB can select a neighboring cell or frequency with a lower-priority RAT only if noneighboring cell or frequency with higher-priority RATs is configured.

If UTRAN is assigned the highest RAT priority, the eNodeB selects target frequencies basedon the setting of the UtranNFreq.CsPriority parameter. For details, see 3.2.5TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering.

The eNodeB selects the handover policy for CSFB of CS-only UEs based on the setting of theCSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg parameter. PS handover takes priorityover redirection.

CS+PS UE

If the UE is a CS+PS UE, the eNodeB selects the target RAT based on the RAT prioritiesspecified by the parameters in Table 3-2.

Table 3-2 Target RAT priority parameter list for CSFB of CS+PS UEs

Target RAT Priority forCSFB of CS+PS UEs

eNodeB-LevelParameter

Cell-Level Parameter

Highest priority InterRat CSFallBackBlind-HoCfg.InterRatHighest-Pri

CellOpHoCfg.InterRatHighestPri

Second priority InterRat CSFallBackBlind-HoCfg.InterRatSecondPri

CellOpHoCfg.InterRatSecondPri

Lowest priority InterRat CSFallBackBlind-HoCfg.InterRatLowestPri

CellOpHoCfg.InterRatLowestPri

The eNodeB can select a neighboring cell or frequency with a lower-priority RAT only if noneighboring cell or frequency with higher-priority RATs is configured.

If UTRAN is assigned the highest RAT priority, the eNodeB selects target frequencies basedon the setting of the UtranNFreq.CsPsMixedPriority parameter. TheUtranNFreq.CsPsMixedPriority and UtranNFreq.CsPriority parameters have similarsetting principles. For details, see 3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PSSteering.

The eNodeB selects the handover policy for CSFB based on the setting of theCSFallBackPolicyCfg.CsfbHoPolicyCfg parameter. PS HO and redirection are selected indescending order.



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3.2.7 Load-based CSFB to UTRANThis section describes load-based CSFB to UTRAN. This function is an enhancement to theCS Fallback to UTRAN feature. The CSFBLoadInfoSwitch option of theENodeBAlgoSwitch.HoAlgoSwitch parameter specifies whether to enable this function.

In load-based CSFB to UTRAN, the eNodeB uses the RIM procedure in Multiple Reportmode to obtain the load information about UTRAN cells. For details about the RIMprocedure, see 3.7 RIM Procedure Between E-UTRAN and UTRAN. After receiving theload information about UTRAN cells, the eNodeB saves the information and uses theinformation to determine the target UTRAN cell for the CSFB.

In load-based CSFB to UTRAN, the measurement and blind handover procedures are thesame as those in the CS Fallback to UTRAN feature. For details, see 3.2.1 TDLOFD-001033CS FallBack to UTRAN.

When selecting a target cell for CSFB to UTRAN, the eNodeB considers UTRAN cells in thefollowing priority order of load status: normal, congested, and overloaded.

Load-based CSFB to UTRAN affects the target cell selection at a later phase. In themeasurement phase, if necessary, cell load status does not affect frequency selection: TheeNodeB does not select a low-priority frequency because all UTRAN cells on a high-priorityfrequency are overloaded.

3.3 Triggering EventsCSFB triggering is classified into measurement triggering and blind handling triggering.

Measurement Triggering

During CSFB, the eNodeB starts UTRAN measurements after it receives a CS FallbackIndicator. The measurement configuration procedure is the same as that for coverage-basedhandovers from E-UTRAN to UTRAN. For details, see Inter-RAT Mobility Management inConnected Mode.

They have different thresholds and time-to-trigger. Table 3-3 lists the thresholds and time-to-trigger related to event B1 for CSFB to UTRAN. Other parameters are the same as thoserelated to event B1 for coverage-based inter-frequency handovers.

Table 3-3 Parameters related to event B1 for CSFB to UTRAN

Parameter Name Parameter ID Parameter Description

CSFB UTRAN EventB1RSCP Trigger Threshold

CSFallBackHo.CsfbHoUtranB1ThdRscp

TheInterRatHoComm.InterRATHoUtranB1MeasQuan parameterdetermines which threshold is to beused.

CSFB UTRAN EventB1ECN0 Trigger Threshold

CSFallBackHo.CsfbHoUtranB1ThdEcn0

CSFB Utran EventB1Time To Trig

CSFallBackHo.CsfbHoUtranTimeToTrig

-



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Blind Handling TriggeringBlind handling is controlled by the following two options. The blind handling function takeseffect only when both options are selected.

l BlindHoSwitch of the eNodeB-level ENodeBAlgoSwitch.HoModeSwitch parameterl BlindHoSwitch of the cell-level CellHoParaCfg.HoModeSwitch parameter

After ultra-flash CSFB to UTRAN or GERAN is enabled and the blind handling functiontakes effect, the eNodeB performs further operations on UEs supporting ultra-flash CSFBbased on the UFCsfbBlindHoDisSwitch option of the CellHoParaCfg.HoModeSwitchparameter.

l If this option is selected, the blind handling function for UEs supporting ultra-flashCSFB does not take effect. Therefore, the eNodeB performs a measurement-based CSFBprocedure for the UEs.

l If this option is cleared, the eNodeB performs a blind-handling-based CSFB procedurefor the UEs supporting ultra-flash CSFB.

When an E-UTRAN coverage area is larger than a UTRAN coverage area and E-UTRAN andUTRAN base stations are co-sited, adaptive blind handover for CSFB can be used. It Itestimates the signal strength of the neighboring UTRAN cell based on the signal strength ofthe serving E-UTRAN cell. The estimation result determines the type of handover.

l If the UE is located in the center of the E-UTRAN cell, the eNodeB performs a blindhandling.

l If the UE is located at the edge of the E-UTRAN cell, the eNodeB performs ameasurement before the CSFB decision.

When the blind handling function is enabled:

l If adaptive blind handover for CSFB is disabled, the eNodeB enters the blind handlingprocedure.

l If adaptive blind handover for CSFB is enabled, the eNodeB delivers the event A1-related measurement configuration after CSFB is started.– If the eNodeB receives an event A1 report, it determines that the UE is located in

the center of the E-UTRAN cell. A blind handling procedure starts.– If the eNodeB does not receive an event A1 report, it determines that the UE is

located at the edge of the E-UTRAN cell. A measurement procedure starts.The threshold for event A1 is specified by the CSFallBackHo.BlindHoA1ThdRsrpparameter, and other event-A1-related principles are the same as these in coverage-basedhandover from E-UTRAN to UTRAN. For details, see Inter-RAT Mobility Managementin Connected Mode Feature Parameter Description.

3.4 Target Cell/Frequency Selection

Measurement Object SelectionThe selection procedure is as follows:

1. The eNodeB selects the target RAT.– If CS Fallback Steering to UTRAN and CS Fallback Steering to GERAN are

enabled and the highest-priority RAT is specified, the eNodeB selects only



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frequencies of the highest-priority RAT. For example, if theCSFallBackBlindHoCfg.IdleCsfbHighestPri parameter is set to UTRAN, theeNodeB selects only UTRAN frequencies for measurement.

– If CS Fallback Steering to UTRAN and CS Fallback Steering to GERAN aredisabled, the eNodeB selects all frequencies for measurement.

2. The eNodeB filters frequencies and neighboring cells.When selecting frequencies of a target RAT for measurement, the eNodeB filters thefrequencies configured on it. It filters out the frequencies not supported by the UE andthen filters out the following neighboring cells on the remaining frequencies:– Blacklisted neighboring cells– Neighboring cells to which handovers are prohibited as indicated by the No

handover indicator parameter for cells in neighboring cell lists– Neighboring cells with different PLMN IDs from the serving cell in neighboring

cell lists (If the inter-PLMN handover switch is on, the eNodeB does not filter outthese neighboring cells.)

– Cells to which handovers are prohibited as indicated by the Handover RestrictionList IE in the INITIAL CONTEXT SETUP REQUEST message sent from theMME

3. The eNodeB selects cells to measure.Figure 3-2 shows the selection procedure.

Figure 3-2 Procedure for selecting cells to measure



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The procedure shown in Figure 3-2 involves the following data configuration andactivities:– Neighboring UTRAN frequencies are configured in UtranNFreq MOs.– The CS service priority is specified by the UtranNFreq.CsPriority or

UtranNFreq.CsPsMixedPriority parameter. For details about this parameter, see3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering and 3.2.6TDLOFD-001088 CS Fallback Steering to UTRAN.

– The priorities of neighboring UTRAN frequencies for connected-mode UEs arespecified by the UtranNFreq.ConnFreqPriority parameter.

– The measurement priority for neighboring UTRAN cells can be automaticallyoptimized by ANR. The UTRAN_SWITCH option of theENodeBAlgoSwitch.NCellRankingSwitch parameter controls the automaticoptimization function. It is recommended that this option be selected only if ANR isenabled.n If this option is selected, the eNodeB automatically optimizes the

UtranNCell.NCellMeasPriority parameter for neighboring UTRAN cells.This parameter cannot be modified manually. For details, see ANRManagement Feature Parameter Description.

n If this option is deselected, the measurement priority is specified by theUtranNCell.CellMeasPriority parameter, which must be configured manually.

– When the eNodeB selects highest-priority frequencies or cells, the number offrequencies or cells selected is equal to the number of candidates if the number doesnot exceed the maximum permissible number. If the number of candidates exceedsthe maximum permissible number, the eNodeB randomly selects the maximumpermissible number of frequencies or cells from the candidates.

– The maximum permissible number of frequencies is specified by theCellUeMeasControlCfg.MaxUtranTddMeasFreqNum parameter.

– The maximum permissible number of neighboring cells is defined in section 6.4"RRC multiplicity and type constraint values" of 3GPP TS 36.331 V10.1.0.

Blind Handling Target Selection

The selection procedure is as follows:

1. The eNodeB selects the target RAT.During blind handling for CSFB, the eNodeB selects the target RAT based on the RATpriorities specified by the parameters in Table 3-4. If both eNodeB- and cell-levelparameters are set, the cell-level parameter settings prevail.

Table 3-4 RAT priority parameters

RAT Priority eNodeB-Level Parameter Cell-Level Parameter

Highest priorityInterRat

CSFallBackBlind-HoCfg.InterRatHighestPri


Second priorityInterRat

CSFallBackBlind-HoCfg.InterRatSecondPri


Lowest priorityInterRat

CSFallBackBlind-HoCfg.InterRatLowestPri




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If CSFallBackBlindHoCfg.InterRatHighestPri or CellOpHoCfg.InterRatHighestPriis set to UTRAN, the eNodeB performs CSFB to UTRAN.

2. The eNodeB filters frequencies and cells.During target selection, the eNodeB filters the frequencies configured on it. It filters outthe frequencies not supported by the UE and then filters out the following neighboringcells on the remaining frequencies:– Blacklisted neighboring cells– Neighboring cells to which handovers are prohibited as indicated by the No

handover indicator parameter for cells in neighboring cell lists– Neighboring cells with different PLMN IDs from the serving cell in neighboring

cell lists (If the inter-PLMN handover switch is on, the eNodeB does not filter outthese neighboring cells.)

– Cells to which handovers are prohibited as indicated by the Handover RestrictionList IE in the INITIAL CONTEXT SETUP REQUEST message sent from theMME

3. The eNodeB selects the target cell or frequency.– Before the eNodeB can select a cell as the target cell for the blind handover from E-

UTRAN to UTRAN, the neighboring UTRAN cell must be configured on theeNodeB and be assigned a blind-handover priority. Figure 3-3 shows the procedurefor selecting the target cell for a blind handover.



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Figure 3-3 Target cell selection for a blind handover

The procedure shown in Figure 3-3 involves the following data configuration andactivities:n The CS service priority is specified by the UtranNFreq.CsPriority or

UtranNFreq.CsPsMixedPriority parameter. For details about this parameter,see 3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering and 3.2.6TDLOFD-001088 CS Fallback Steering to UTRAN.

n Neighboring UTRAN cells are configured in UtranNCell MOs.n The blind-handover priorities of neighboring UTRAN cells are specified by

the UtranNCell.BlindHoPriority parameter.n If there is more than one highest-priority frequency or neighboring cell, the

eNodeB randomly selects one.– Before the blind redirection from E-UTRAN to UTRAN, neighboring UTRAN

frequencies and their priorities for connected-mode UEs must be configured.Neighboring UTRAN cell configurations are not required. Figure 3-4 shows theprocedure for selecting the target frequency for blind redirection.



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Figure 3-4 Target frequency selection for blind redirection

The procedure shown in Figure 3-4 involves the following data configuration andactivities:n Neighboring UTRAN frequencies are configured in UtranNFreq MOs.n The priorities of neighboring UTRAN frequencies for connected-mode UEs

are specified by the UtranNFreq.ConnFreqPriority parameter.n The CS service priority is specified by the UtranNFreq.CsPriority or

UtranNFreq.CsPsMixedPriority parameter. For details about this parameter,see 3.2.5 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering and 3.2.6TDLOFD-001088 CS Fallback Steering to UTRAN.

n Neighboring UTRAN cells are configured in UtranNCell MOs.n The eNodeB selects a frequency from the candidates based on blind-handover

priorities of neighboring cells as follows:○ If neighboring cells are assigned non-zero blind-handover priorities,

which is specified by UtranNCell.BlindHoPriority, the eNodeB selectsthe operating frequency of the cell with the highest blind-handoverpriority.

○ If all neighboring cells are assigned blind-handover priority 0, theeNodeB considers frequency priorities for connected-mode UEs It



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preferentially selects the frequency with the highest priority forconnected-mode UEs.

n The PLMN information about neighboring UTRAN frequencies is containedin UtranRanShare or UtranExternalCell MOs.

n If there is more than one highest-priority frequency or cell, the eNodeBrandomly selects one.

3.5 DecisionIn the decision phase, the eNodeB checks the candidate cell list. Based on the check result, theeNodeB determines whether a CSFB needs to be initiated and, if so, to which cell the UE is tobe fallen back to.

The candidate cell list generated for CSFB is controlled by theCellHoParaCfg.L2UCsfbMRProMode parameter.

This parameter has three values: HANDOVERIMMEDIATELY,BASEDONSIGNALSTRENGTH, and BASEDONFREQPRIORITY. Figure 3-5 showsthe candidate cell list generation procedure when parameter configurations are different.



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Figure 3-5 Candidate cell list generation procedure

As shown in Figure 3-5, the CellHoParaCfg.CsfbMRWaitingTimer parameter specifies thetimer for candidate cell list generation during CSFB.

When a candidate cell based on BASEDONSIGNALSTRENGTH orBASEDONFREQPRIORITY is selected and the subsequent handover preparation fails, theeNodeB no longer starts the timer to wait but performs the decision immediately afterreceiving the measurement report.

3.5.1 Basic Decision MethodWhen the CSFB policy is PS handover, SRVCC, or redirection (excluding flash redirection),the eNodeB uses the basic decision method, with no need to obtain system information of thepeer.

In the decision phase, the eNodeB checks the candidate cell list. Based on the check result, theeNodeB determines whether a CSFB needs to be initiated and, if so, to which cell the UE is tobe fallen back to. If the eNodeB receives measurement reports about different RATs, ithandles the reports in a first-in first-out manner.



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The eNodeB sends a handover request to the target cell. If the handover request fails, theeNodeB sends the handover request to the next target cell, as described in Table 3-5.

Table 3-5 Sequence of handover requests to be sent by the eNodeB

Candidate Cell ListGenerated by

Sequence of Handover Requests

Measurement A handover request is sent to the cell with the best signalquality.

Blind handover A handover request is sent to a cell or frequency that has thehighest priority. If multiple cells have the highest priority, theeNodeB randomly selects a cell for blind handover.

If the handover request fails in all candidate cells:

l In a measurement-based handover procedure, the eNodeB waits for a next measurementreport from the UE.

l In a blind handover procedure, the eNodeB stops the handover attempt.

3.5.2 Decision Based on System InformationWhen the handover policy (for example, flash redirection) requires the eNodeB to obtainsystem information about the peer, the eNodeB makes a handover decision based on systeminformation. In this phase, the eNodeB delivers system information about cells about thetarget RAT to the UE. Therefore, the UE does need to read the system information, shorteningthe delay of access to the target network.

Decision based on system information adheres to the following principles:

l In blind handling scenarios:

a. The eNodeB generates a candidate cell list based on the blind-handover priorities ofcells on the target frequencies of redirection and then adds other cells on thesefrequencies to the list. The UTRAN_SWITCH option of theENodeBAlgoSwitch.NCellRankingSwitch parameter specifies the sequence ofadding other cells.If this switch is on, the eNodeB adds other cells on the target frequencies indescending order of UtranNCell.NCellMeasPriority.If this switch is off, the eNodeB adds cells with the highest measurement priorityspecified by the UtranNCell.CellMeasPriority parameter.

b. The eNodeB takes the actions described in 3.5.1 Basic Decision Method.c. The eNodeB filters out the cells whose system information has not been obtained.d. The eNodeB filters cells based on SPID-based mobility management in connected

mode. For details, see LOFD-00105401 Camp & Handover Based on SPID inFlexible User Steering Feature Parameter Description.

l In measurement scenarios:

a. The eNodeB adds cells on the target frequency for redirection but not inmeasurement reports to the target cell list generated based on measurement reports.



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The UTRAN_SWITCH option of the ENodeBAlgoSwitch.NCellRankingSwitchparameter specifies the sequence of adding other cells.

b. The eNodeB takes the actions described in 3.5.1 Basic Decision Method.c. The eNodeB filters out the cells whose system information has not been obtained.

Operators can set the InterRatHoComm.CellInfoMaxUtranCellNum parameter to specifythe maximum permissible number of UTRAN cells contained in a redirection message.Assume that this parameter is set to N.

l If the number of target cells in the filtering result is greater than N, the eNodeB selectsthe first N cells.

l If the number of target cells in the filtering result is smaller than N, the eNodeB selectsall these cells.

The eNodeB obtains system information about target cells through the RIM procedure. If atarget cell does not support the RIM procedure, the eNodeB cannot obtain system informationabout that cell.

3.6 ExecutionIn the execution phase, the eNodeB controls the fallback of the UE from the source cell to thetarget cell or frequency.

3.6.1 CSFB Policy SelectionCSFB from E-UTRAN to UTRAN can be based on PS handover, redirection, or flashredirection, as shown in Figure 3-6. This policy selection procedure is based on theassumption that neighboring frequencies and cells have been configured appropriately.



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Figure 3-6 EUTRAN-to-UTRAN CSFB policy selection procedure

The CSFB policy is determined by different parameters, depending on whetherTDLOFD-001088 CS Fallback Steering to UTRAN is enabled.

l If this feature is enabled:

– The CSFB policy for UEs in idle mode is specified by theCSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg parameter.

– The CSFB policy for UEs in connected mode is specified by theCSFallBackPolicyCfg.CsfbHoPolicyCfg parameter.

l If this feature is disabled, the CSFB policy is specified by theCSFallBackPolicyCfg.CsfbHoPolicyCfg parameter, regardless of whether UEs are inidle or connected mode.

The parameters in Figure 3-6 are described as follows:



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l If blind redirection for CSFB is required, select the REDIRECTION option of theCSFallBackPolicyCfg.CsfbHoPolicyCfg parameter.

l The CSFB protection timer is specified by the CSFallBackHo.CsfbProtectionTimerparameter.If the UE does not send inter-RAT measurement reports and stays in the area covered bythe eNodeB when the timer expires, the eNodeB performs redirection for CSFB.– The eNodeB preferentially selects a system that the UE has not measured. For

example, if the UE has measured the UTRAN, the eNodeB preferentially selects theGERAN for redirection.

– The eNodeB preferentially selects the operating frequency of a cell to which theeNodeB has never attempted to hand over the UE as the target frequency forredirection.

– If there is no target frequency available for redirection, the eNodeB stops theprocedure.If flash CSFB is enabled in this situation, redirection performed by the eNodeB isreferred to as emergency redirection for CSFB. In this scenario, operators mustmust set the InterRatHoComm.UtranCellNumForEmcRedirect parameter tospecify the maximum number of UTRAN cells that can be included in anemergency redirection message.

l The eNodeB selects the target cell for redirection as it does during blind handling. Fordetails about the selection, see 3.4 Target Cell/Frequency Selection.– Blind handover is controlled by the BlindHoSwitch option in the eNodeB-level

parameter ENodeBAlgoSwitch.HoModeSwitch and the BlindHoSwitch option inthe cell-level parameter CellHoParaCfg.HoModeSwitch. The blind handoverfunction takes effect only when both options are selected.

– Adaptive blind handover for CSFB is controlled by theCsfbAdaptiveBlindHoSwitch option of the cell-level parameterCellAlgoSwitch.HoAllowedSwitch.

NOTE

This function is also controlled by the CsfbAdaptiveBlindHoSwitch option of the eNodeB-level parameter ENodeBAlgoSwitch.HoAlgoSwitch.

The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameter is cleared.

The eNodeB-level parameter will no longer be used in later versions. Therefore, you areadvised to use the cell-level parameter.

l If PS handover for CSFB is required, the UtranPsHoSwitch option of theCellHoParaCfg.HoModeSwitch parameter and the PS_HO option of theCSFallBackPolicyCfg.CsfbHoPolicyCfg parameter must be selected. If either option iscleared, PS handover for CSFB does not take effect. The eNodeB selects redirection asthe CSFB policy. If redirection does not take effect either, the eNodeB enters theemergency blind redirection procedure when the CSFB protection timer expires.

NOTE

This function is also controlled by the UtranPsHoSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoModeSwitch.





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l During a blind PS handover for CSFB, if the handover preparation in the target cell withthe highest blind handover priority fails, the eNodeB tries the cell with the secondhighest blind handover priority. The eNodeB can try a maximum of eight cells. If allthese cells fail in handover preparation, the eNodeB performs emergency blindredirection.

3.6.2 Redirection-based CSFB Optimization for UEs in Idle ModeRedirection-based CSFB for UEs in idle mode has been optimized to accelerate CSFB byshortening end-to-end delay and to reduce the CSFB failure rate due to initial context setupfailures.

An eNodeB evaluates whether to perform the optimized redirection procedure after itdetermines to perform a blind handover, as shown in Figure 3-7.

Figure 3-7 Redirection-based CSFB optimization for UEs in idle mode

The optimization is controlled by the IdleCsfbRedirectOptSwitch option of theGlobalProcSwitch.ProtocolMsgOptSwitch parameter.

For details about how to decide between redirection and flash redirection, see 3.6.1 CSFBPolicy Selection.



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For details about the signaling procedure for redirection-based CSFB optimization for UEs inidle mode, see 13.1.6 Redirection-based CSFB Optimization for UEs in Idle Mode.

NOTE

When the optimization switch is turned on and CSFB with LAI to UTRAN or GERAN is enabled, it isrecommended that the RsvdSwPara1_bit25 option of the ENBRsvdPara.RsvdSwPara1 parameter beselected to prevent function conflicts.

3.6.3 CSFB Admission Optimization for UEs in Idle ModeA UE in idle mode only has a default bearer for data service, and the allocation/retentionpriority (ARP) of the default bearer is generally lower. At CSFB to a cell that is congested orcannot accommodate more UEs, this UE cannot preempt resources in the target cell.

To increase the CSFB success rate in this scenario, the eNodeB can preferentially admit CSFBUEs. This function is controlled by the CSFallBackPolicyCfg.CsfbUserArpCfgSwitchparameter.

A larger value of the CsFallbackPolicyCfg.NormalCsfbUserArp parameter indicates ahigher probability that UEs in idle mode are admitted to target cells for CSFB. For detailsabout the admission procedure, see Admission and Congestion Control .

3.6.4 Retry and PenaltyFor CSFB to UTRAN based on PS handover, after the eNodeB sends a handover request tothe target cell and admission failure, including resource admission failure and non-resourceadmission failure, occurs, the eNodeB imposes a penalty on the target cell. During the penaltyperiod, the eNodeB does not allow UEs to be handed over to the target cell, avoidingunnecessary handover request signaling and increasing the handover preparation failure rate.After the penalty period, if the target cell meets handover requirements, the eNodeB retriesthe handover request to the target cell. For details about the penalty and retry, see Intra-RATMobility Management in Connected Mode Feature Parameter Description.

If the emergency blind redirection procedure for CSFB is triggered, the eNodeB does notconsider whether the target cell is penalized during target cell selection.

3.7 RIM Procedure Between E-UTRAN and UTRANThe RIM procedure exchanges information between the E-UTRAN and UTRAN.

In CSFB procedures, an eNodeB obtains the load information of external UTRAN cells fromRNCs through the RIM procedure. When the GlobalProcSwitch.UtranLoadTransChanparameter is set to BASED_ON_RIM, the eNodeB obtains UTRAN cell load informationthrough the RIM procedure for target cell selection.

In flash CSFB procedures, an eNodeB obtains the system information (SI) of UTRAN cellsfrom RNCs through the RIM procedure.

The RIM procedure may use one of the following information exchange modes:

l Single Report

In Single Report mode, the source sends a request, and then the target responds with asingle report.



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When flash CSFB to UTRAN is activated, the eNodeB sends a RIM request to the RNCand then includes the obtained SI in a redirection message to the UE. If the eNodeB failsto obtain SI from the RNC, the eNodeB no longer sends the RIM request.

l Multiple ReportCurrently, the eNodeB triggers a RIM procedure in Multiple Report mode only if MMEscomply with 3GPP Release 9 or later.In Multiple Report mode, the target responds with a report after receiving a request fromthe source, and the target also sends a report to the source each time information aboutthe target changes.When flash CSFB to UTRAN is enabled, the eNodeB sends RIM requests to allneighboring UTRAN cells every 4 seconds no matter whether the eNodeB has CSFBservices.To ensure that the SI of a UTRAN neighboring cell can be obtained successfully, theeNodeB starts a 4s timer when it sends a RIM request.– If the eNodeB receives a response to the RIM request before the timer expires, the

eNodeB saves the obtained SI.– If the eNodeB receives a response to the RIM request after the timer expires, the

eNodeB considers that an exception has occurred and discards the SI.– If the eNodeB does not receive a response to the RIM request even after the timer

expires, the eNodeB sends the RIM request and starts the timer again (called aretry) 2 hours later. If the eNodeB still does not receive a response after 10 retries,the RIM request fails. The interval between the nth and (n-1)th retries is twice thenumber of the retries n. For example, the first retry occurs 2 hours after the first SIacquisition fails, the second retry occurs 4 hours after the first retry fails, and thethird retry occurs 6 hours after the second retry fails. For each retry, the eNodeBsends a RIM request and restarts the timer.

The eNodeB may obtain incorrect SI due to errors in the UTRAN, core network, ortransport network. To avoid this situation, the eNodeB randomly selects a time pointevery day from 02:00 a.m. to 04:00 a.m and deletes all the obtained SI. Then, theeNodeB requests the SI of UTRAN cells through the RIM procedure again.If a neighboring UTRAN cell is faulty or deactivated, the RNC sends the eNodeB anEND message, instructing the eNodeB to stop the RIM procedure. The eNodeB thendeletes the obtained SI and requests SI again in the next RIM procedure.

The RIM procedure can be performed through the core network or eCoordinator.

3.7.1 RIM Procedure Through the Core NetworkIf ENodeBAlgoSwitch.RimOnEcoSwitch is set to OFF(Off), the RIM procedure isperformed through the core network. As shown in Figure 3-8, the RIM procedure involvesthe eNodeB, MME, SGSN, and RNC Among these NEs, the MME and the SGSN transfer butdo not interpret information. For details, see section 8c "Signalling procedures between RIMSAPs" in 3GPP TS 48.018 V10.0.0.



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Figure 3-8 RIM procedure through the core network

In Figure 3-9:

l The UTRAN_RIM_SWITCH option of the ENodeBAlgoSwitch.RimSwitch parametercontrols the RIM procedure between E-UTRAN and UTRAN.If this option is selected, the eNodeB uses the RIM procedure in Multiple Report modeto obtain the SI of external UTRAN cells.

l The UtranSepOpMobilitySwitch option of theENodeBAlgoSwitch.MultiOpCtrlSwitch parameter specifies whether UTRAN operatorscan use different mobility policies.

l The UtranNetworkCapCfg.NetworkCapCfg parameter specify the capability of SIacquisition through RIM. If the capability is not configured for an operator or RNC, it issupported by default.



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Figure 3-9 Information exchange mode selection for the RIM procedure

3.7.2 RIM Procedure Through the eCoordinatorIf ENodeBAlgoSwitch.RimOnEcoSwitch is set to ON(On), the RIM procedure is performedthrough the eCoordinator. As shown in Figure 3-10, the RIM procedure through theeCoordinator involves the eNodeB, eCoordinator, and RNC. Among these NEs, theeCoordinator transfers but does not interpret information.

Figure 3-10 RIM procedure through the eCoordinator



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The RIM procedure through the eCoordinator requires that the corresponding switches of thisfunction be on at all these NEs.

During this RIM procedure, each NE does not send RIM messages to the core network orprocess RIM messages from the core network.

The information exchange mode for the eCoordinator-based RIM procedure is controlled byUTRAN_RIM_SWITCH of the ENodeBAlgoSwitch.RimSwitch parameter.

l If this switch is on, the eNodeB uses the RIM procedure in Multiple Report mode toobtain the SI of external UTRAN cells.

l If this switch is off, the eNodeB uses the RIM procedure in Single Report mode.



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4 CSFB to GERAN

This chapter describes each CSFB to GERAN feature, CSFB procedure, and RIM procedurebetween E-UTRAN and GERAN.

eRAN TDDCS Fallback Feature Parameter Description 4 CSFB to GERAN


42

4.1 OverviewCSFB to GERAN can be implemented in different ways, and this chapter covers the followingfeatures:

l TDLOFD-001034 CS Fallback to GERANl TDLOFD-001053 Flash CS Fallback to GERANl TDOFD-001069 CS Fallback with LAI to GERANl TDLOFD-001089 CS Fallback Steering to GERANl TDLOFD-081203 Ultra-Flash CSFB to GERAN

Figure 4-1 shows the CSFB to GERAN procedure.

Figure 4-1 CSFB to GERAN procedure

4.2 Feature Description

4.2.1 TDLOFD-001034 CS Fallback to GERANThis section describes the optional feature TDLOFD-001034 CS Fallback to GERAN. Thisfeature is controlled by the GeranCsfbSwitch option of the cell-level parameterCellAlgoSwitch.HoAllowedSwitch.



43

NOTE

This feature is also controlled by the GeranCsfbSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to usethe cell-level parameter.

This feature has the same principles as CS Fallback to UTRAN, except the precedingparameters. For details about the principles, see 3.2.1 TDLOFD-001033 CS FallBack toUTRAN.

Handover MeasurementThe frequency priority used during target frequency selection is specified by theGeranNfreqGroup.ConnFreqPriority parameter. A larger value indicates a higher priority.

During the GERAN frequency selection for measurement that is different from the UTRANfrequency selection, if the total number of the GERAN frequencies that can be delivered inthe frequency group with the highest priority and the frequencies that have been deliveredexceeds the allowed maximum number 32, all frequencies in this frequency group cannot bedelivered. The eNodeB determines whether the GERAN frequencies in the frequency groupwith the second highest priority can be delivered until the number of delivered frequencies isless than or equal to the maximum number of GERAN frequencies allowed for measurementor all frequency groups are determined.

In GERAN, no cell measurement priority is configured. If the number of cells working on afrequency exceeds the specification, the eNodeB randomly measures certain cells.

Blind HandlingIf the eNodeB-level CSFallBackBlindHoCfg.InterRatHighestPri parameter or cell-levelCellOpHoCfg.InterRatHighestPri parameter is set to GERAN(GERAN), the eNodeBperforms CSFB to GERAN. In case that both eNodeB- and cell-level parameters areconfigured, the cell-level parameter settings prevail.

During blind handling, the target RAT selection procedure is different, depending on whetherneighboring GERAN cells are configured.

l If neighboring GERAN cells are configured:– The blind handover priority of a GERAN neighboring cell is specified by the

GeranNcell.BlindHoPriority parameter. A larger value indicates a higher priority.– The GERAN frequency group with the highest priority (specified by the

GeranNfreqGroup.ConnFreqPriority parameter) is selected for blind handling. Alarger value indicates a higher priority.

– If the priorities of neighboring cells or frequencies are the same, the eNodeBrandomly selects a target cell or frequency. Due to uncertainty of random selection,you are not advised to set the priorities to the same to ensure the blind handoversuccess.

l If no neighboring GERAN cell is configured:– Neighboring GERAN frequencies are configured in GeranNfreqGroup MOs.– The PLMN information of the neighboring GERAN frequency is contained in the

configured GeranRanShare or GeranExternalCell MOs.



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4.2.2 TDLOFD-001053 Flash CSFB to GERANThis section describes the optional feature TDLOFD-001053 Flash CSFB to GERAN. Thisfeature is controlled by the GeranFlashCsfbSwitch option of the cell-level parameterCellAlgoSwitch.HoAllowedSwitch.

NOTE

This feature is also controlled by the GeranFlashCsfbSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.



This feature is an enhancement to the optional feature TDLOFD-001034 CS Fallback toGERAN. After this feature is activated, the eNodeB obtains the system information ofGERAN cells through the RIM procedure and then sends UEs the EUTRAN-to-GERANredirection messages that contain the system information. TheInterRatHoComm.CellInfoMaxGeranCellNum parameter specifies the maximum numberof GERAN cells that can be contained in a redirection message.

With this feature, UEs access the GERAN cells with no need to read the system informationin the cells. This reduces the access delay. For details about how the GERAN sends thesystem information to the eNodeB through RIM procedures, see Interoperability BetweenGSM and LTE.

This feature has the same principles as Flash CS Fallback to UTRAN. For details, see 3.2.2TDLOFD-001052 Flash CS Fallback to UTRAN.

4.2.3 TDLOFD-001069 CS Fallback with LAI to GERANThis section describes the optional feature TDLOFD-001069 CS Fallback with LAI toGERAN. This feature is under license control but not under switch control.

This feature has the same principles as CS Fallback with LAI to UTRAN. For details, see3.2.4 TDLOFD-001068 CS Fallback with LAI to UTRAN.

4.2.4 TDLOFD-001089 CS Fallback Steering to GERANThis section describes the optional feature TDLOFD-001089 CS Fallback Steering toGERAN. This feature is controlled by the GeranCsfbSteeringSwitch option of the cell-levelparameter CellAlgoSwitch.HoAllowedSwitch.

NOTE

This feature is also controlled by the GeranCsfbSteeringSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.



The principles of this feature are similar to the principles of the CS Fallback Steering toUTRAN feature. For details about the principles, see 3.2.6 TDLOFD-001088 CS FallbackSteering to UTRAN.



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The eNodeB selects a handover policy for CSFB of a CS-only UE based on the setting of theCSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg parameter. The eNodeB selects PShandover, CCO, or redirection in descending order of priority.

The eNodeB selects a handover policy for CSFB of a CS+PS UE based on the setting of theCSFallBackPolicyCfg.CsfbHoPolicyCfg parameter. The eNodeB selects PS handover, CCO,or redirection in descending order of priority.

4.2.5 TDLOFD-081203 Ultra-Flash CSFB to GERANThis section describes the optional feature TDLOFD-081203 Ultra-Flash CSFB to GERAN.The GeranUltraFlashCsfbSwitch option of the ENodeBAlgoSwitch.HoAlgoSwitchparameter specifies whether to enable this feature. This feature is a Huawei-proprietary one.To enable this feature, the MME, MSC, and eNodeB must be all provided by Huawei andsupport this feature. No IMS needs to be deployed.

When a UE initiates a CS service setup request in an LTE network that does not supportVoLTE, this feature enables the eNodeB to hand over the UE to the GERAN through theSRVCC procedure. The procedure has CS resources on the GERAN prepared in advance andomits certain protocol-defined signaling procedures during access to the GERAN, shorteningthe CSFB delay by 2s. For the detailed signaling procedure, see 13.2.6 Ultra-Flash CSFB toGERAN.

The measurement procedure and blind handling procedure for this feature are the same asthose described in 3.2.1 TDLOFD-001033 CS FallBack to UTRAN.

This feature works when external GERAN cells support it.l If all external GERAN cells support this feature, no configuration on the eNodeB is

required.l If some external GERAN cells do not support ultra-flash CSFB to GERAN, the

following configurations are required:– Set UltraFlashCsfbInd to BOOLEAN_FALSE for external GERAN cells that do

not support ultra-flash CSFB to GERAN.– The ultra-flash CSFB to GERAN capability for external GERAN cells is specified

by the GeranExternalCell.UltraFlashCsfbInd parameter.

If the Fast Return to LTE feature is enabled on the GERAN side, the UE can quickly return tothe E-UTRAN when it completes the voice service on the GERAN. To achieve this, theChannel Release message must contain E-UTRA frequency information, based on which theUE selects a suitable E-UTRAN cell to camp on.

When IratMeasCfgTransSwitch under the GlobalProcSwitch.ProtocolMsgOptSwitchparameter is on, the eNodeB filters E-UTRA frequencies supported by the UE based on theUE capability to obtain a frequency set. During the SRVCC procedure, the eNodeB sends thetarget BSC a Handover Required message containing the frequency set, which serves as areference for the fast return procedure.

If the CellDrxPara.DrxForMeasSwitch parameter is set to ON(On), the eNodeB delivers theDRX and gap-assisted measurement configurations if the following conditions are met. In thefollowing scenarios, the UE performs measurements preferentially in consecutive sections ofsleep time in DRX to accelerate the measurements and decrease the delay.

l The UE cannot autonomously perform gap-assisted measurements. In this case, theAutoGapSwitch option of the ENodeBAlgoSwitch.HoModeSwitch parameter isdeselected or the interRAT-NeedForGaps IE for the GSM frequency is TRUE in the UEcapability message.



46

l The UE supports DRX.

l The BlindHoSwitch option of the ENodeBAlgoSwitch.HoModeSwitch parameter iscleared or the following conditions are met:

– The BlindHoSwitch option of the ENodeBAlgoSwitch.HoModeSwitch parameteris selected.

– The BlindHoSwitch option of the CellHoParaCfg.HoModeSwitch parameter isselected.

– The UFCsfbBlindHoDisSwitch option of the CellHoParaCfg.HoModeSwitchparameter is selected.

To increase the probability of the UE entering sleep time, set DRX parameters to achieve alonger sleep time. However, this setting affects scheduling and therefore decreases cellthroughput.

For details about how to configure measurement-specific DRX parameters, see DRX andSignaling Control.

NOTE

If a UE does not support ultra-flash CSFB, a UE compatibility issue arises. To address this issue, selectthe UltraFlashCsfbComOptSw option of the GlobalProcSwitch.UeCompatSwitch parameter.

4.3 TriggeringCSFB triggering is classified into measurement triggering and blind handling triggering. Fordetails, see 3.3 Triggering Events.

When the CSFB_MEAS_DEL_INTERFREQ_SW option of theCellAlgoSwitch.MeasOptAlgoSwitch parameter is selected, the eNodeB implements thefollowing optimization for measurement:

l When the GSM measurement is triggered by CSFB, the eNodeB releases all the inter-frequency measurement.

l After the GSM measurement is triggered by CSFB, starting the inter-frequencymeasurement is forbidden.

4.4 Target Cell/Frequency Selection

Measurement Object Selection

The frequency priority used during measurement object selection is specified by theGeranNfreqGroup.ConnFreqPriority parameter. A larger value indicates a higher priority.

Unlike the UTRAN frequency selection, in the GERAN frequency selection, if the totalnumber of GERAN frequencies in the highest-priority frequency group to be delivered andfrequencies that have been delivered exceeds the maximum number 32, the eNodeB does notdeliver any frequency in this group. The eNodeB then evaluates whether to deliver theGERAN frequencies in the frequency group with the second highest priority. The evaluationstops when the number of delivered frequencies is less than or equal to the maximum numberor all frequency groups have been evaluated.



47

For CSFB to GERAN, no cell measurement priority is configured. If the number of cells on afrequency exceeds the maximum permissible number, the eNodeB randomly selects cells formeasurement.

Blind Handling Target Selection

If CSFallBackBlindHoCfg.InterRatHighestPri is set to GERAN(GERAN), the eNodeBperforms CSFB to GERAN.

The target RAT selection procedure varies depending on whether neighboring GERAN cellshave been configured.

l If neighboring GERAN cells have been configured, the eNodeB selects a target cell withthe highest blind handover priority or a target frequency group with the highest priorityfor connected-mode UEs.

– The blind handover priority of a GERAN neighboring cell is specified by theGeranNcell.BlindHoPriority parameter. A larger value indicates a higher priority.

– The GERAN frequency group priority for connected-mode UEs is specified by theGeranNfreqGroup.ConnFreqPriority parameter. A larger value indicates a higherpriority.

– If neighboring cells or frequencies have the same priority, the eNodeB randomlyselects one. To prevent uncertainty of random selection and increase the successrate of blind handovers, you are not advised to set an identical priority for cells orfrequencies.

l If no neighboring GERAN cell has been configured:

– Neighboring GERAN frequency groups are configured in GeranNfreqGroupMOs.

– The PLMN information about neighboring GERAN frequencies is contained in theGeranRanShare or GeranExternalCell MOs.

4.5 DecisionThe decision for CSFB to GERAN is the same as that for CSFB to UTRAN. For details, see3.5 Decision.

4.6 ExecutionWhen a UE in an LTE network needs to perform a voice service but the LTE network does notsupport VoLTE, a procedure of CSFB to an inter-RAT network is triggered.

CSFB from E-UTRAN to GERAN can be based on PS handover, CCO/NACC, redirection, orflash redirection, as shown in Figure 4-2. This policy selection procedure is based on theassumption that neighboring frequencies and cells have been configured appropriately.

During a blind PS handover for CSFB, if the handover preparation in the target cell with thehighest blind handover priority fails, the eNodeB tries the cell with the second highest blindhandover priority. The eNodeB can try a maximum of eight cells. If all these cells fail inhandover preparation, the eNodeB performs emergency blind redirection.



48

Figure 4-2 EUTRAN-to-GERAN CSFB policy selection procedure

The parameters in Figure 4-2 are described as follows:

l The CSFB protection timer is specified by the CSFallBackHo.CsfbProtectionTimerparameter. If the UE stays in the area covered by the eNodeB when the timer expires, theeNodeB performs redirection for CSFB.

– The eNodeB preferentially selects a system that the UE has not measured. Forexample, if the UE has measured the UTRAN, the eNodeB preferentially selects theGERAN for redirection.

– If there is no target frequency available for redirection, the eNodeB stops theprocedure.

If flash CSFB is enabled in this situation, redirection performed by the eNodeB isreferred to as CSFB emergency redirection. For this type of CSFB, you must set theInterRatHoComm.GeranCellNumForEmcRedirect parameter to specify themaximum number of GERAN cells that can be contained in a message delivered tothe UE during a CSFB emergency redirection procedure.

l Blind handover is controlled by the BlindHoSwitch option of the eNodeB-levelparameter ENodeBAlgoSwitch.HoModeSwitch and the BlindHoSwitch option of the



49

cell-level parameter CellHoParaCfg.HoModeSwitch. The blind handover function takeseffect only when both options are selected.

l Adaptive blind handover for CSFB is controlled by the CsfbAdaptiveBlindHoSwitchoption of the cell-level parameter CellAlgoSwitch.HoAllowedSwitch.

NOTE

This function is also controlled by the CsfbAdaptiveBlindHoSwitch option of the eNodeB-levelparameter ENodeBAlgoSwitch.HoAlgoSwitch.The option of the cell-level parameter takes effect only when that option of the eNodeB-levelparameter is cleared.The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised touse the cell-level parameter.

l The CSFB policies are controlled by the options of theENodeBAlgoSwitch.HoModeSwitch parameter:– The PS handover capability is specified by GeranPsHoSwitch.– The CCO capability is specified by GeranCcoSwitch.– The NACC capability is specified by GeranNaccSwitch.– The redirection capability is specified by GeranRedirectSwitch.

When CSFB to GERAN is based on CCO with NACC, the eNodeB obtains SI ofexternal cells from RNCs through the RIM procedure. For details about the RIMprocedure, see 4.7 RIM Procedure Between E-UTRAN and GERAN.

l The CSFB policy is determined by different parameters, depending on whetherTDLOFD-001089 CS Fallback Steering to GERAN is enabled.If this feature is enabled:– The CSFB policy for UEs in idle mode is specified by the

CSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg parameter.– The CSFB policy for UEs in connected mode is specified by the

CSFallBackPolicyCfg.CsfbHoPolicyCfg parameter.If this feature is disabled, the CSFB policy is specified by theCSFallBackPolicyCfg.CsfbHoPolicyCfg parameter, regardless of whether UEs are inidle or connected mode.If a target cell experiences admission failure during a handover from E-UTRAN toGERAN, the target cell enters the penalty and retry procedure. The penalty and retryprocedure from E-UTRAN to GERAN is the same as that from E-UTRAN to UTRAN.For details, see 3.6.4 Retry and Penalty.

4.7 RIM Procedure Between E-UTRAN and GERANThe principles of the RIM procedure between E-UTRAN and GERAN are the same as thosedescribed in 3.7 RIM Procedure Between E-UTRAN and UTRAN.

The RIM procedure between E-UTRAN and GERAN is enabled by default because there isno switch for selecting a load information transfer channel.

If ENodeBAlgoSwitch.RimOnEcoSwitch is set to OFF(Off), the RIM procedure isperformed through the core network. If this parameter is set to ON(On), the RIM procedure isperformed through the eCoordinator. The two RIM procedures select information exchangemodes in the same way.

In Figure 4-3:



50

l The RIM procedure between E-UTRAN and GERAN is controlled by theGERAN_RIM_SWITCH option of the ENodeBAlgoSwitch.RimSwitch parameter.– If this option is selected, the eNodeB uses the RIM procedure in Multiple Report

mode to obtain the SI of external GERAN cells. If external GERAN cells do notsupport the Multiple Report mode, they do not notify the eNodeB of any systeminformation change after the initial request.

– If this option is cleared, the eNodeB uses the RIM procedure in Single Report modeto obtain the system information of external GERAN cells.

Figure 4-3 Information exchange mode selection for the RIM procedure



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5 Handover and CSFB Procedure Conflict

Optimization

When the UE in connected mode initiates the CSFB procedure during S1/X2-based handoverpreparation, the CSFB procedure conflicts with the handover procedure. The eNodeBpreferentially processes the handover procedure and responds to the MME with a CSFB callrequest failure message. After the handover is complete, the MME re-sends a CSFB requestmessage to the eNodeB to re-initiate the CSFB procedure, as stipulated by 3GPP TS 23.401.If the MME cannot re-send the CSFB reestablishment request in such a scenario, the CSFBcall fails.

When a UE attaching to the network or in idle mode initiates a TAU procedure, a defaultbearer is established. The eNodeB considers the UE in connected mode and allows thehandover procedure before completing the Attach or TAU procedure. However, the MMEallows the handover procedure only after the attach or TAU procedure is completed.Therefore, the MME identifies the handover request from the eNodeB as inappropriate anddiscards it. The eNodeB waits for the handover request response for 20s (default valuespecified by the timer). If the eNodeB receives the UE CONTEXT MODIFICATIONREQUEST message with the CS Fallback Indicator IE from the MME, the eNodeB rejects theCSFB request and therefore the CSFB call fails.

To solve CSFB call failure problems in the preceding scenarios, the eNodeB needs topreferentially process the CSFB procedure upon the conflict. Select theCsfbFlowFirstSwitch option of the GlobalProcSwitch.HoProcCtrlSwitch parameter so thatthe eNodeB preferentially processes the CSFB procedure during handover preparation. If theeNodeB receives the UE CONTEXT MODIFICATION REQUEST message with the CSFallback Indicator IE before handover indication is transmitted over the air interface, theeNodeB sends the HANDOVER CANCEL message to the MME to cancel the handoverprocedure and prioritize the CSFB procedure.

NOTE

When the CSFB procedure conflicts with the inter-eNodeB reestablishment with no context, the eNodeBpreferentially processes the reestablishment procedure.

eRAN TDDCS Fallback Feature Parameter Description 5 Handover and CSFB Procedure Conflict Optimization


52

6 Related Features

6.1 Features Related to TDLOFD-001033 CS FallBack toUTRAN

Prerequisite Features

Feature ID Feature Name Description

TDLOFD-001019 PS Inter-RAT Mobilitybetween E-UTRAN andUTRAN

None

Mutually Exclusive Features

None

Impacted Features


TDLOFD-001035 CS Fallback toCDMA2000 1xRTT

When a UE initiates a CSFB request,the eNodeB cannot determine whetherthe target inter-RAT network is aCDMA2000 1xRTT network or aGERAN/UTRAN, according to 3GPPRelease 9. Therefore, it is notrecommended that CSFB to GERAN/UTRAN be enabled together withCSFB to CDMA2000 1xRTT. That is, itis not recommended that this feature beenabled together with the preceding twofeatures.

eRAN TDDCS Fallback Feature Parameter Description 6 Related Features


53


TDLOFD-001090 Enhanced CS Fallback toCDMA2000 1xRTT

If both CSFB to UTRAN and CSFB toCDMA2000 are enabled, the eNodeBattempts to perform CSFB to UTRANfirst. If the attempt fails, the eNodeBtries CSFB to CDMA2000.

6.2 Features Related to TDLOFD-001052 Flash CS Fallbackto UTRAN



TDLOFD-001033 CS Fallback to UTRAN None


None

Impacted Features

None

6.3 Features Related to TDLOFD-081223 Ultra-Flash CSFBto UTRAN





None

Impacted Features

None



54

6.4 Features Related to TDLOFD-001068 CS Fallback withLAI to UTRAN

Prerequisite FeaturesFeature ID Feature Name Description


Mutually Exclusive FeaturesNone

Impacted FeaturesNone

6.5 Features Related to TDLOFD-001088 CS FallbackSteering to UTRAN




Impacted FeaturesFeature ID Feature Name Description

TDLOFD-001089 CS Fallback Steering toGERAN

In overlapping coverage of GSM,UMTS, and LTE networks, these twofeatures, if enabled simultaneously,achieve CSFB steering to differentRATs.



55

6.6 Features Related to TDLOFD-001078 E-UTRAN toUTRAN CS/PS Steering



TDLOFD-001033 CS Fallback to UTRAN This feature depends on eitherpreceding feature.

TDLOFD-001019 PS Inter-RAT Mobilitybetween E-UTRAN andUTRAN


None

Impacted Features

None

6.7 Features Related to TDLOFD-001034 CS Fallback toGERAN



TDLOFD-001020 PS Inter-RAT Mobilitybetween E-UTRAN andGERAN

None


None

Impacted Features


TDLOFD-001035 CS Fallback toCDMA2000 1xRTT

When a UE initiates a CSFB request,the eNodeB cannot determine whetherthe target inter-RAT network is aCDMA2000 1xRTT network or a



56


TDLOFD-001090 Enhanced CS Fallback toCDMA2000 1xRTT

GERAN/UTRAN, according to 3GPPRelease 9. Therefore, it is notrecommended that CSFB to GERAN/UTRAN be enabled together withCSFB to CDMA2000 1xRTT. That is, itis not recommended that this feature beenabled together with either of thepreceding features.If both CSFB to GERAN and CSFB toCDMA2000 are enabled, the eNodeBattempts to perform CSFB to GERANfirst. If the attempt fails, the eNodeBtries CSFB to CDMA2000.

6.8 Features Related to TDLOFD-001053 Flash CSFB toGERAN


TDLOFD-001034 CS Fallback to GERAN None



6.9 Features Related to TDLOFD-081203 Ultra-Flash CSFBto GERAN





57



6.10 Features Related to TDLOFD-001069 CS Fallback withLAI to GERAN





6.11 Features Related to TDLOFD-001089 CS FallbackSteering to GERAN






58

Impacted FeaturesFeature ID Feature Name Description

TDLOFD-001088 CS Fallback Steering toUTRAN

In overlapping coverage of GSM,UMTS, and LTE networks, these twofeatures, if enabled simultaneously,achieve CSFB steering to differentRATs.



59

7 Network Impact

7.1 TDLOFD-001033 CS FallBack to UTRAN

System CapacityIn essence, CSFB provides CS service access for E-UTRAN UEs. Considering that thenumber of UEs that request CS services within an area is relatively stable and is not affectedby EPS deployment, CSFB has no impact on the total number of UEs that request CS serviceswithin a network.

Load-based CSFB to UTRAN prevents PS handover preparation failure caused by UTRANcell congestion, because the eNodeB selects a target cell based on the UTRAN cell loadstatus. This increases system capacity.

CSFB mechanisms affect signaling overhead as follows:

l If redirection is used as the CSFB mechanism, no extra signaling message is required forthe UTRAN because each CSFB procedure is equivalent to the initiation of a new CSservice. The EPS does not need to interact with the target network. Therefore, signalingoverhead is negligible.

l If PS handover is used as the CSFB mechanism, extra signaling messages are requiredfrom each NE for the request, preparation, and execution of each handover. However,from the perspective of traffic statistics, the number of UEs that initiate CS services persecond per cell during peak hours is far below cell capacity. Therefore, signalingoverhead caused by PS handovers is low.

Network PerformanceLoad-based CSFB to UTRAN prevents PS handover preparation failure caused by UTRANcell congestion, because the eNodeB selects a target cell based on the UTRAN cell loadstatus. This increases the CSFB delay.

CSFB affects the access success rate as follows:

l CSFB affects the access success rate as follows: If redirection is used as the CSFBmechanism, each CSFB procedure is equivalent to the initiation of a new CS service.Therefore, the access success rate for CSFB UEs is theoretically the same as that fornormal CS UEs in the UTRAN.

eRAN TDDCS Fallback Feature Parameter Description 7 Network Impact


60

l If PS handover is used as the CSFB mechanism, the access success rate for CSFB UEsdepends on the success rate of handovers to the target RAT. Handover-triggered CSservice access has a higher requirement for signal quality compared with normal CSservice access. Therefore, the access success rate for CSFB UEs is a little lower than thatfor normal CS UEs in the UTRAN.

7.2 TDLOFD-001052 Flash CS Fallback to UTRAN

System Capacity

In essence, CSFB provides CS service access for E-UTRAN UEs. Considering that thenumber of UEs that request CS services within an area is relatively stable and is not affectedby EPS deployment, CSFB has no impact on the total number of UEs that request CS serviceswithin a network.


l Extra signaling messages are required only during eNodeB deployment. Afterward,signaling overhead is negligible because of infrequent system information updates.

Network Performance

Flash CSFB to UTRAN decreases the CSFB delay by up to 1.28s because UEs obtaininformation about the target UTRAN cell for redirection before RRC connections to the LTEnetwork are released.

Flash CSFB affects the access success rate as follows:

l Each flash CSFB procedure is equivalent to the initiation of a new CS service. Therefore,the access success rate for CSFB UEs is theoretically the same as that for normal CSUEs in the UTRAN.

l The RRC connection setup success rate may decrease slightly for the UTRAN. Theuplink interference information contained in SIB7 in the UTRAN updates frequently.The RNC cannot update the uplink interference information in the system informationsent to the LTE network based on SIB7 in the UTRAN. Therefore, the uplinkinterference information contained in SIB7 in the LTE network is a default value (–105dBm). If the actual uplink interference in the UTRAN is greater than –105 dBm, thetransmit power on UEs' physical random access channel (PRACH) increases and theRRC connection setup success rate may decrease.

7.3 TDLOFD-081223 Ultra-Flash CSFB to UTRAN

System Capacity

No impact.

Network Performance

Compared with standard CSFB, this feature reduces the delay of CSFB to UTRAN by 1second, improving user experience.



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7.4 TDLOFD-001068 CS Fallback with LAI to UTRAN

System CapacityNo impact.

Network PerformanceCSFB with LAI ensures that a UE can fall back to the CS network to which the UE hasattached. This prevents CSFB failure or long delay caused by incorrect target RAT selectionand increases the CSFB success rate.

7.5 TDLOFD-001088 CS Fallback Steering to UTRAN


Network PerformanceUsing this feature, an operator that owns inter-RAT networks can specify the target RAT andfrequency for CSFB based on the network plan and network load balancing requirements andthereby improve network operating efficiency.

If the frequency with the highest priority is inappropriately configured, for example, if thehighest-priority frequency has coverage holes, a UE may fail to measure this frequency andtherefore the CSFB delay increases.

This feature may conflict with the service-based directed retry decision (DRD) algorithm usedfor UTRAN, thereby affecting user experience. For example, if a CS service is initiated for aUE that is performing PS services, the eNodeB may select a High Speed Packet Access(HSPA) frequency used in UTRAN for CSFB based on configured policies. However, if theUE requests CS bearer establishment first after the fallback, the UTRAN may transfer the UEto an R99 frequency.

7.6 TDLOFD-001078 E-UTRAN to UTRAN CS/PS Steering


Network PerformanceE-UTRAN to UTRAN CS/PS Steering enables an eNodeB to include only UTRANfrequencies with the highest CS service priority in measurement configurations. This preventsredundant measurements, reduces the measurement time, and decreases end-to-end CSFBdelay.

Consistent settings of the CS service priorities for UTRAN frequencies between the E-UTRAN and the UTRAN help prevent further handovers for service steering after CSFB.



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7.7 TDLOFD-001034 CS Fallback to GERAN

System Capacity



l If redirection or CCO without NACC is used as the CSFB mechanism, no extra signalingmessage is required for the GERAN because each CSFB procedure is equivalent to theinitiation of a new CS service. The EPS does not need to interact with the target network.Therefore, signaling overhead is negligible.

l If CCO with NACC is used as the CSFB mechanism, extra signaling messages arerequired only during eNodeB deployment.

l If PS handover is used as the CSFB mechanism, extra signaling messages are requiredfrom each NE for the request, preparation, and execution of each handover. However,from the perspective of traffic statistics, the number of UEs that initiate CS services persecond per cell during peak hours is far below cell capacity. Therefore, signalingoverhead caused by PS handovers is low.

Network Performance

CSFB affects the access success rate as follows:

l If redirection or CCO/NACC is used as the CSFB mechanism, each CSFB procedure isequivalent to the initiation of a new CS service. Therefore, the access success rate forCSFB UEs is theoretically the same as that for normal CS UEs in the GERAN.

l If PS handover is used as the CSFB mechanism, the access success rate for CSFB UEsdepends on the success rate of handovers to the target RAT. Handover-triggered CSservice access has a higher requirement for signal quality compared with normal CSservice access. Therefore, the access success rate for CSFB UEs is a little lower than thatfor normal CS UEs in the GERAN.

7.8 TDLOFD-001053 Flash CSFB to GERAN

System Capacity


CSFB mechanisms affect signaling overhead as follows: Extra signaling messages arerequired only during eNodeB deployment. Afterward, signaling overhead is negligiblebecause of infrequent system information updates.



63

Network Performance

If flash CSFB is used as the CSFB mechanism, each CSFB procedure is equivalent to theinitiation of a new CS service. Therefore, the access success rate for CSFB UEs istheoretically the same as that for normal CS UEs in the GERAN.

Flash CSFB to GERAN decreases the CSFB delay by up to 2s because UEs obtaininformation about the target GERAN cell for redirection before RRC connections to the LTEnetwork are released.

7.9 TDLOFD-081203 Ultra-Flash CSFB to GERAN

System Capacity

When DRX is used for measurements, there is a higher probability that the UE enters sleeptime. This affects the scheduling and therefore decreases cell throughput.

Network Performance

Compared with standard CSFB, this feature reduces the delay of CSFB to GERAN by 2s,improving user experience.

7.10 TDLOFD-001069 CS Fallback with LAI to GERAN

System Capacity

No impact.

Network Performance

CSFB with LAI ensures that a UE can fall back to the CS network to which the UE hasattached. This prevents CSFB failure or long delay caused by incorrect target RAT selectionand increases the CSFB success rate.

7.11 TDLOFD-001089 CS Fallback Steering to GERAN

System Capacity

No impact.

Network Performance

Using this feature, an operator that owns inter-RAT networks can specify the target RAT andfrequency for CSFB based on the network plan and network load balancing requirements andthereby improve network operating efficiency.

If the frequency with the highest priority is inappropriately configured, for example, if thehighest-priority frequency has coverage holes, a UE may fail to measure this frequency andtherefore the CSFB delay increases.



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8 Engineering Guidelines

8.1 TDLOFD-001033 CS Fallback to UTRANThis section provides engineering guidelines for TDLOFD-001033 CS Fallback to UTRAN.

8.1.1 When to Use CS Fallback to UTRANUse this feature in the initial phase of LTE network deployment when the followingconditions are met:

l The operator owns a mature UTRAN network.

l The LTE network does not provide VoLTE services, or UEs in the LTE network do notsupport VoLTE services.

For policies on whether to use PS handover or PS redirection for CSFB, see Inter-RATMobility Management in Connected Mode. If UTRAN and E-UTRAN cells cover the samearea, or the UTRAN cell provides better coverage than the E-UTRAN cell, use CSFB basedon blind handover to decrease the CSFB delay.

8.1.2 Required Information1. Collect the operating frequencies, coverage areas, and configurations of the E-UTRAN

and UTRAN cells. Information about coverage areas includes engineering parameters ofsites (such as latitude and longitude), TX power of cell reference signals, and neighborrelationship configurations.

2. Collect the versions and configurations of the NEs in the E-UTRAN, UTRAN, and corenetworks, and ensure that they all support CSFB. Table 8-1 describes the requirementsof CSFB to UTRAN for the core networks.

3. Collect the following information about the UEs that support UMTS and LTE on the livenetwork:

– Supported frequency bands

– Whether the UEs support redirection from E-UTRAN to UTRAN

– Whether the UEs support PS handover from E-UTRAN to UTRAN

– Whether the UEs support UTRAN measurements

eRAN TDDCS Fallback Feature Parameter Description 8 Engineering Guidelines


65

This information is used to configure neighboring UTRAN cells and to determinewhether to perform CSFB based on handover or redirection. For details, see Inter-RATMobility Management in Connected Mode.

4. Collect information about the RNC, MME, and SGSN to check whether they all supportRIM procedures.

Table 8-1 Requirements of CSFB to UTRAN for core networks

NE Requirement

MME l Supports: SGs interface to the MSCl LAI selection based on the TAI of the serving

celll MSC-initiated pagingl PLMN selection and reselectionl Combined EPS/IMSI attach, combined EPS/

IMSI detach, and combined TAU/LAUl CS signaling message routingl SMS over SGs

MSC l Supports: Combined EPS/IMSI attachl SMS over SGsl Paging message forwarding over the SGs

interface

SGSN Does not activate idle mode signaling reduction(ISR) during the combined RAU/LAU procedureinitiated by the UE.

8.1.3 Requirements

Operating Environmentl For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is not

for eRAN3.0, messages may not be parsed.l For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 8.

Check that software versions for the EPC are correct.

LicenseThe operator has purchased and activated the license for the feature listed in Table 8-2.



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Table 8-2 License control item for CSFB to UTRAN

Feature ID FeatureName

Model LicenseControlItem

NE Sales Unit

TDLOFD-001033

CS Fallbackto UTRAN

LT1ST0CFBU00

CS FallbacktoUTRAN(TDD)

eNodeB per RRCConnectedUser

8.1.4 PrecautionsNone

8.1.5 Data Preparation and Feature Activation

8.1.5.1 Data PreparationThis section describes the data that you need to collect for setting parameters. Required data isdata that you must collect for all scenarios. Collect scenario-specific data when necessary fora specific feature deployment scenario.

There are three types of data sources:

l Network plan (negotiation not required): parameter values planned and set by theoperator

l Network plan (negotiation required): parameter values planned by the operator andnegotiated with the EPC or peer transmission equipment

l User-defined: parameter values set by users

Required DataBefore configuring CSFB to UTRAN, collect the data related to neighbor relationships withUTRAN cells. This section provides only the information about managed objects (MOs)related to neighboring UTRAN cells. For more information about how to collect data for theparameters in these MOs, see Inter-RAT Mobility Management in Connected Mode FeatureParameter Description. Collect data for the parameters in the following MOs:

1. UtranNFreq: used to configure neighboring UTRAN frequencies.2. UtranExternalCell: used to configure external UTRAN cells. The

UtranExternalCell.Rac parameter must be set.3. UtranExternalCellPlmn: used to configure additional PLMN IDs for each shared

external UTRAN cell. This MO is required only if the NodeB that serves the externalUTRAN cell works in RAN sharing with common carriers mode and multiple operatorsshare the external UTRAN cell.

4. UtranNCell: used to configure the neighboring relationship with a UTRAN cell. If aneighboring UTRAN cell supports blind handovers according to the network plan, theblind-handover priority of the cell must be specified by theUtranNCell.BlindHoPriority parameter.



67

Scenario-specific DataThe following table describes the parameters that must be set in the CellHoParaCfg andCellAlgoSwitch MOs to set the cell-level handover mode and handover allowed switches forCS Fallback to UTRAN.

Parameter Name

Parameter ID

DataSource

Setting Notes

HandoverModeswitch

CellHoParaCfg.HoModeSwitch

Networkplan(negotiationnotrequired)

Set this parameter based on the network plan.To activate PS handovers, select theUtranPsHoSwitch(UtranPsHoSwitch) option. Ifthis option is not selected, redirection will be usedfor CSFB to UTRAN.

HandoverAllowedSwitch

CellAlgoSwitch.HoAllowedSwitch


To activate CSFB to UTRAN, select theUtranCsfbSwitch(UtranCsfbSwitch) option.

The following table describes the parameters that must be set in the ENodeBAlgoSwitch andCellHoParaCfg MOs to set eNodeB- and cell-level blind handover switches.

Parameter Name

Parameter ID

DataSource

Setting Notes

HandoverModeswitch

ENodeBAlgoSwitch.HoModeSwitch


To activate blind handovers, select theBlindHoSwitch(BlindHoSwitch) option of theparameter. If the BlindHoSwitch(BlindHoSwitch)option is cleared, blind handovers for all cells underthe eNodeB are invalid.

HandoverModeswitch



To activate blind handovers for a cell under theeNodeB, select theBlindHoSwitch(BlindHoSwitch) option of theparameter. If the BlindHoSwitch(BlindHoSwitch)option is cleared, blind handovers for the cell areinvalid.

The following table describes the parameters that must be set in the CellAlgoSwitch andCSFallBackHo MOs to set the switch for cell-level adaptive blind handover for CSFB andthe A1 threshold for adaptive blind handover for CSFB.



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Parameter Name

Parameter ID

DataSource

Setting Notes




When UMTS and LTE cells are co-sited with thesame coverage, you can enableCsfbAdaptiveBlindHoSwitch. The eNodeB selectsa measurement or blind handover to UMTS basedon the event A1 report submitted by a UE.

CSFBAdaptiveBlind HoA1 RSRPTriggerThreshold

CSFallBackHo.BlindHoA1ThdRsrp


This parameter specifies the RSRP threshold of theserving cell above which a CSFB-triggered adaptiveblind handover is triggered. If the RSRP valuemeasured by a UE exceeds this threshold, the UEsubmits a event A1 report. If the eNodeB receivesan event A1 report, it directly enters the blindhandling procedure. If the eNodeB does not receivean event A1 report (the UE is located at the edge ofthe E-UTRAN cell), it enters the measurementprocedure. The target measurement RAT depends onconfigured RAT priorities and UE capabilities.On the live network, set this parameter based onnetwork coverage.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfgMO to set the blind-handover priorities of different RATs for CSFB.

ParameterName

ParameterID

DataSource

Setting Notes

CNOperator ID

CSFallBackBlindHoCfg.CnOperatorId

Network plan(negotiationnotrequired)

Set this parameter based on the network plan. Thisparameter identifies the operator whose RAT blind-handover priorities are to be set.

HighestpriorityInterRat

CSFallBackBlindHoCfg.InterRatHighestPri


Set this parameter based on the network plan. Thisparameter is set to UTRAN by default and specifiesthe highest-priority RAT to be considered in blindhandovers for CSFB. For CSFB to UTRAN, retain thedefault value.



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ParameterName

ParameterID

DataSource

Setting Notes

SecondpriorityInterRat

CSFallBackBlindHoCfg.InterRatSecondPri


Set this parameter based on the network plan. Thisparameter is set to GERAN by default and specifiesthe second-highest-priority RAT to be considered inblind handovers for CSFB. Ensure that this parameteris set to a different value from the CSFallBackBlind-HoCfg.InterRatHighestPri and CSFallBackBlind-HoCfg.InterRatLowestPri parameters.

LowestpriorityInterRat

CSFallBackBlindHoCfg.InterRatLowestPri


Set this parameter based on the network plan. Thisparameter is set to CDMA2000 by default andspecifies the lowest-priority RAT to be considered inblind handovers for CSFB. Ensure that this parameteris set to a different value from the CSFallBackBlind-HoCfg.InterRatHighestPri and CSFallBackBlind-HoCfg.InterRatSecondPri parameters.

UTRAN LCScapability

CSFallBackBlindHoCfg.UtranLcsCap


Set this parameter based on the network plan. Thisparameter specifies the LCS capability of theUTRAN.

The following table describes the parameters that must be set in the CellOpHoCfg MO to setcell-level handover priorities of different RATs for CSFB.

Parameter Name

Parameter ID DataSource

Setting Notes

CNOperatorID

CellOpHoCfg.CnOperatorId


Set this parameter based on the networkplan. This parameter identifies the operatorwhose RAT blind-handover priorities are tobe set.

Local cellID

CellOpHoCfg.LocalCellId


Set this parameter based on the networkplan. This parameter identifies the cellwhose RAT blind-handover priorities are tobe set.




Set this parameter based on the networkplan. This parameter is set to UTRAN bydefault and specifies the highest-priorityRAT to be considered in blind handoversfor CSFB. For CSFB to UTRAN, retain thedefault value.



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Parameter Name


Setting Notes




Set this parameter based on the networkplan. This parameter is set to GERAN bydefault and specifies the second-highest-priority RAT to be considered in blindhandovers for CSFB. Ensure that thisparameter is set to a different value fromthe CSFallBackBlind-HoCfg.InterRatHighestPri andCSFallBackBlind-HoCfg.InterRatLowestPri parameters.




Set this parameter based on the networkplan. This parameter is set to CDMA2000by default and specifies the lowest-priorityRAT to be considered in blind handoversfor CSFB. Ensure that this parameter is setto a different value from theCellOpHoCfg.InterRatHighestPri andCellOpHoCfg.InterRatSecondPriparameters.

The following table describes the parameter that must be set in the ENodeBAlgoSwitch MOto activate load-based CSFB.

Parameter Name

ParameterID

Data Source Setting Notes

HandoverAlgoswitch

ENodeBAlgoSwitch.HoAlgoSwitch

Network plan(negotiation notrequired)

To activate load-based CSFB, select theCSFBLoadInfoSwitch(CSFBLoadInfoSwitch) option.

The following table describes the parameter that must be set in the GlobalProcSwitch MO toset load-based CSFB to UTRAN.

ParameterName

ParameterID

DataSource

Setting Notes

ChooseUTRAN CellLoad InfoTrans Channel

GlobalProcSwitch.UtranLoadTransChan

Networkplan(negotiation notrequired)

Set this parameter to BASED_ON_RIM toenable UTRAN cell load informationacquisition through RIM if the RNC,MME, and SGSN support RIM.

The following table describes the parameter that must be set in the CSFallBackHo MO to setthe CSFB protection timer.



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Parameter Name

ParameterID


CSFBProtectionTimer

CSFallBackHo.CsfbProtectionTimer


Set this parameter based on the networkplan. The default value 4 applies to aGSM+UMTS+LTE network. The value2 is recommended for a UMTS+LTEnetwork. If this parameter is set toolarge, the CSFB delay increases inabnormal CSFB scenarios. If thisparameter is set too small, normalmeasurement or handover proceduresmay be interrupted.

The following table describes the parameter that must be set in the CSFallBackPolicyCfgMO to specify the CSFB policy.

ParameterName

ParameterID


CSFBhandoverpolicyConfiguration

CSFallBackPolicyCfg.CsfbHoPolicyCfg

Network plan(negotiationnot required)

Set this parameter based on the network plan.The default values are REDIRECTION,CCO_HO, and PS_HO. You are advised to setthis parameter based on the UE capabilities andnetwork capabilities.NOTE

If none of the three options is selected andmeasurement-based mobility is enabled, the eNodeBdoes not perform CSFB for a UE until the CSFBprotection timer expires. Then the eNodeB performsa blind redirection for the UE. If blind handover isenabled, the eNodeB directly performs a blindredirection for the UE.

CCO_HO applies only to CSFB to GERAN.

The following table describes the parameter that must be set in the GlobalProcSwitch MO tocontrol redirection-based CSFB optimization for UEs in idle mode.



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ParameterName


Setting Notes

ProtocolMessageOptimizationSwitch

GlobalProcSwitch.ProtocolMsgOptSwitch


To shorten the CSFB delay by skipping an RRCconnection reconfiguration procedure duringblind redirection for CSFB, select theIdleCsfbRedirectOptSwitch option of thisparameter.

The following table describes the parameter that must be set in the CSFallBackBlindHoCfgMO to set the round-robin switch when multiple frequencies are of the same priority forCSFB-based blind redirections.

ParameterName

ParameterID


CSFBtoUTRANBlindRedirectionRRSwitch

CSFallBackBlindHoCfg.UtranCsfbBlindRedirRrSw


The function corresponding to this parameterdoes not take effect when CSFB steering orCS/PS steering is enabled. This parameter willbe cancelled in later versions. The default valueOFF is recommended.

The following table describes the parameter that must be set in the GlobalProcSwitch MO toset the CSFB frequency selection optimization switch.

ParameterName

ParameterID


CSFBFlowOptimizationSwitch

GlobalProcSwitch.CsfbFlowOptSwitch


SetUTRAN_CSFB_FREQ_CHOOSE_OPT_SWbased on the network plan. The option is clearedby default. If there are multiple targetfrequencies or cells of the same priority, the UEselects the target frequency or cell randomly andevenly. The target frequency selection is affectedby the number of cell priorities of the targetfrequency.



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The following table describes the parameters that must be set in the CellHoParaCfg MO toconfigure the measurement report processing and waiting functions.

Parameter Name

Parameter ID Data Source Setting Notes

LTE ToUTRANCSFBMeasurementProcessing Mode

CellHoParaCfg.L2UCsfbMRProMode


If this parameter is set toBASED_ON_SIGNAL_STRENGTH orBASED_ON_FREQ_PRIORITY, the eNodeB does notimmediately trigger handover afterreceiving a measurement report.Instead, it waits for othermeasurement reports so that it canselect a desired cell from themeasurement reports for CSFB.

CSFBMeasurementWaitingTimer

CellHoParaCfg.CsfbMRWaitingTimer


The default value 100ms isrecommended. This avoids longtime in waiting for the nextmeasurement report and theimpact on CSFB delay.

The following table describes the parameter that must be set in the GlobalProcSwitch MO toset the policy for handling the conflicts between handover and CSFB procedures.

Parameter Name


HandoverProcessControlSwitch

GlobalProcSwitch.HoProcCtrlSwitch


It is recommended that thisparameter be set when handoverand CSFB procedures conflict,increasing the number of CSFBpreparation failures. The numberof CSFB preparation failuresbecause of procedure conflicts isobtained fromL.CSFB.PrepFail.Conflict.

8.1.5.2 Using the CMEl Fast Batch Activation

This feature can be batch activated using the Feature Operation and Maintenancefunction of the CME. For detailed operations, see the following section in the CMEproduct documentation or online help: CME Management > CME Guidelines >Enhanced Feature Management > Feature Operation and Maintenance.

l Single/Batch ConfigurationThis feature can be activated for a single eNodeB or a batch of eNodeBs on the CME.For detailed operations, see CME-based Feature Configuration.



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8.1.5.3 Using MML Commands

Using MML Commands

Basic scenario 1: CSFB to UTRAN using blind redirection

CSFB to UTRAN using blind redirection works regardless of whether neighboring UTRANcells are configured.l If you want to configure a neighboring UTRAN cell, you must configure the

UtranNFreq and UtranNCell MOs. For details about parameter settings, see Inter-RATMobility Management in Connected Mode.

l If you do not want to configure a neighboring UTRAN cell, you must configure theUtranRanShare or UtranExternalCell MO. For details about parameter settings, seeInter-RAT Mobility Management in Connected Mode.

Step 1 Run the MOD CELLALGOSWITCH command with theUtranCsfbSwitch(UtranCsfbSwitch) option of the Handover Allowed Switch parameterselected.

NOTE

This function is also controlled by the UtranCsfbSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.


The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that theeNodeB-level parameter be turned off and the cell-level parameter be used.

Step 2 Run the following eNodeB- and cell-level commands to enable blind handovers for CSFB toUTRAN:

1. Run the MOD ENODEBALGOSWITCH command with theBlindHoSwitch(BlindHoSwitch) option of the Handover Mode switch parameterselected.

2. Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of theHandover Mode switch parameter selected.

Step 3 Run the MOD CSFALLBACKPOLICYCFG command with the CCO_HO and PS_HOoptions of the CSFB handover policy Configuration parameter cleared and theREDIRECTION option of the same parameter selected.

Step 4 (Optional) If you require UTRAN to have the highest priority for CSFB, run the followingeNodeB- and cell-level commands:

1. Run the MOD CSFALLBACKBLINDHOCFG command with the Highest priorityInterRat and Second priority InterRat parameters set to UTRAN and GERAN,respectively.

2. Run the ADD CELLOPHOCFG command with the Highest priority InterRat andSecond priority InterRat parameters set to UTRAN and GERAN, respectively.

Step 5 (Optional) If a neighboring UTRAN cell is configured, run the MOD UTRANNCELLcommand with the Blind handover priority parameter set to the highest priority (32).

Step 6 (Optional) If no neighboring UTRAN cell is configured, run the MOD UTRANNFREQcommand with the Frequency Priority for Connected Mode parameter set to the highestpriority (8).



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Step 7 (Optional) Run the MOD GLOBALPROCSWITCH command with theIdleCsfbRedirectOptSwitch option of the Protocol Message Optimization Switchparameter selected.

----End

Basic scenario 2: CSFB to UTRAN using blind handovers

Step 1 Run MML commands to configure neighboring UTRAN frequencies and UTRAN cells. Fordetails about parameter settings, see Inter-RAT Mobility Management in Connected Mode.


NOTE

This function is also controlled by the UtranCsfbSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.



Step 3 Run the following eNodeB- and cell-level commands to enable blind handovers for CSFB toUTRAN:



Step 4 Run the MOD CELLHOPARACFG command with theUtranPsHoSwitch(UtranPsHoSwitch) option of the Handover Mode switch parameterselected.

NOTE

This function is also controlled by the UtranPsHoSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoModeSwitch.



Step 5 Run the MOD UTRANNCELL command with the Blind handover priority parameter setto 32.

----End

Basic scenario 3: CSFB to UTRAN using measurement-based redirection





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NOTE

This function is also controlled by the UtranCsfbSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that theeNodeB-level parameter be turned off and the cell-level parameter be used.

Step 3 Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of theHandover Mode switch parameter deselected for the cells to be measured.


----End

Basic scenario 4: CSFB to UTRAN using measurement-based handovers



NOTE

This function is also controlled by the UtranCsfbSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that theeNodeB-level parameter be turned off and the cell-level parameter be used.


Step 4 Run the MOD CSFALLBACKPOLICYCFG command with the PS_HO option of theCSFB handover policy Configuration parameter selected.

Step 5 Run the MOD CELLHOPARACFG command with theUtranPsHoSwitch(UtranPsHoSwitch) option of the Handover Mode switch parameterselected.

NOTE

This function is also controlled by the UtranPsHoSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoModeSwitch.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that theeNodeB-level parameter be turned off and the cell-level parameter be used.

----End

Enhanced scenario 1: Load-based CSFB to UTRAN

To activate load-based CSFB to UTRAN, run the following commands after the commands ina basic scenario are executed:



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Step 1 Run the MOD ENODEBALGOSWITCH command with theCSFBLoadInfoSwitch(CSFBLoadInfoSwitch) option of the Handover Algo switchparameter selected.

Step 2 Run the MOD GLOBALPROCSWITCH command with the Choose UTRAN Cell LoadInfo Trans Channel parameter set to BASED_ON_RIM.

----End

Enhanced scenario 2: Measurement report processing and waiting

To enable the eNodeB to immediately perform handover evaluation after receiving ameasurement report for CSFB to UTRAN, run the following command after the commands ina basic scenario are executed:

Step 1 Run the MOD CELLHOPARACFG command with the HANDOVER_IMMEDIATELYoption of the LTE To UTRAN CSFB Measurement Processing Mode parameter selected.

----End

Enhanced scenario 3: Policy setting for handling the conflicts between handover and CSFBprocedures

To enable the eNodeB to process the CSFB procedure first, run the following command afterthe commands in a basic scenario are executed:

Step 1 Run the MOD GLOBALPROCSWITCH command with the CsfbFlowFirstSwitch optionof the Handover Process Control Switch parameter selected.

----End

MML Command Examples

Basic scenario 1: CSFB to UTRAN using blind redirection (configured with neighboringUTRAN cells)

MOD CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch= UtranCsfbSwitch-1;MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1;MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN, InterRatSecondPri=GERAN;ADD CELLOPHOCFG: LocalCellId=0, CnOperatorId=0, InterRatHighestPri=UTRAN,InterRatSecondPri=GERAN;MOD UTRANNCELL: LocalCellId=0, Mcc="460", Mnc="20", RncId=1, CellId=123, BlindHoPriority=32;MOD GLOBALPROCSWITCH: ProtocolMsgOptSwitch=IdleCsfbRedirectOptSwitch-1;

Basic scenario 1: CSFB to UTRAN using blind redirection (configured with no neighboringUTRAN cell)

MOD CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch= UtranCsfbSwitch-1;MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1;MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;MOD CELLOPHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN,InterRatSecondPri=GERAN;MOD UTRANNFEQ: LocalCellId=0, UtranDlArfcn=9700, ConnFreqPriority=8;MOD UTRANRANSHARE: LocalCellId=0, UtranDlArfcn=9700, Mcc="460", Mnc="20";MOD GLOBALPROCSWITCH: ProtocolMsgOptSwitch=IdleCsfbRedirectOptSwitch-1;MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, UtranCsfbBlindRedirRrSw=ON;

Basic scenario 2: CSFB to UTRAN using blind handovers



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MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch= UtranCsfbSwitch-1;MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=UtranPsHoSwitch-1&BlindHoSwitch-1;MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1;

MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-1;MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN, InterRatSecondPri=GERAN;MOD UTRANNCELL: LocalCellId=0, Mcc="460", Mnc="20", RncId=1, CellId=123, BlindHoPriority=32;

Basic scenario 3: CSFB to UTRAN using measurement-based redirection

MOD CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch= UtranCsfbSwitch-1;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;MOD CSFALLBACKHO: LocalCellId=1, CsfbHoUtranTimeToTrig=40ms, CsfbHoUtranB1ThdRscp=-106, CsfbHoUtranB1ThdEcn0=-13, CsfbProtectionTimer=4;MOD CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0;MOD UTRANNCELL: LocalCellId=0, Mcc="460", Mnc="20", RncId=1, CellId=123;

Basic scenario 4: CSFB to UTRAN using measurement-based handovers

MOD CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch= UtranCsfbSwitch-1;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-1;MOD CSFALLBACKHO: LocalCellId=1, CsfbHoUtranTimeToTrig=40ms, CsfbHoUtranB1ThdRscp=-106, CsfbHoUtranB1ThdEcn0=-13, CsfbProtectionTimer=4;MOD CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0&UtranPsHoSwitch-1;MOD UTRANNCELL: LocalCellId=0, Mcc="460", Mnc="20", RncId=1, CellId=123;

Enhanced scenario 1: Load-based CSFB to UTRAN

To activate load-based CSFB to UTRAN, run the following commands after the commands ina basic scenario are executed:

MOD ENODEBALGOSWITCH:HoAlgoSwitch=CSFBLoadInfoSwitch-1;MOD GLOBALPROCSWITCH:UtranLoadTransChan=BASED_ON_RIM;

Enhanced scenario 2: Measurement report processing and waiting

To enable the eNodeB to immediately perform handover evaluation after receiving ameasurement report for CSFB to UTRAN, run the following command after the commands ina basic scenario are executed:

MOD CELLHOPARACFG:LocalCellId=0, L2UCsfbMRProMode= HANDOVER_IMMEDIATELY;



MOD GLOBALPROCSWITCH:HoProcCtrlSwitch= CsfbFlowFirstSwitch-1;

8.1.6 Activation Observation

Signaling ObservationThe activation observation procedure for CSFB to UTRAN is as follows:

1. Enable a UE to camp on an E-UTRAN cell and originate a voice call so that the UE fallsback to a UTRAN cell and completes the call.

2. Enable a UE to camp on an E-UTRAN cell and receive a voice call so that the UE fallsback to a UTRAN cell and completes the call.

The activation observation procedure for load-based CSFB to UTRAN is as follows:



79

Two UTRAN cells A and B report MRs and are under overload control and in the normalstate, respectively. The RSCP of cell A is larger than that of cell B.

Enable a UE to perform a PS-handover-based CSFB when both cell A and cell B provideservices correctly.

1. If the RSCP of cell B meets the handover requirements, the eNodeB transfers the UE tocell B.

2. If cell B is blocked and the RSCP of cell A meets the handover requirements, theeNodeB transfers the UE to cell A and the UE can access the network throughpreemption or queuing.

Figure 8-1 and Figure 8-2 show sample procedures for CSFB to UTRAN for a mobile-originated call and CSFB to UTRAN for a mobile-terminated call, respectively. In theexamples, the UE was in idle mode before the call and is forced to fall back to the UTRANusing a redirection.

NOTE

The same UE is shown in the left and right sides of the figure. This applies to all figures in the rest ofthis document. The messages on the UTRAN side are only for reference.



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Figure 8-1 Redirection-based CSFB to UTRAN for a mobile-originated call



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Figure 8-2 Redirection-based CSFB to UTRAN for a mobile-terminated call

If the UE capability is not included in the Initial Context Setup Request (Initial Context SetupReq in the figures) message, the eNodeB initiates a UE capability transfer procedureimmediately after receiving this message from the MME. If the UE capability is included inthe Initial Context Setup Request message, the eNodeB initiates a UE capability transferprocedure after sending an Initial Context Setup Response (Initial Context Setup Rsp in thefigures) message to the MME.

If measurement-based redirection is used for CSFB to UTRAN, the eNodeB delivers the B1-related measurement configuration.

If blind redirection is used for CSFB to UTRAN, the eNodeB does not deliver the B1-relatedmeasurement configuration but sends an RRC Connection Release (RRC Conn Rel in thefigures) message to the UE. As shown in the red and green boxes in Figure 8-3, in the RRCConnection Release message, the cause value is "other" and the target RAT is UTRAN. For anemergency call, the cause value is "CSFBhighpriority."



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Figure 8-3 The RRC Connection Release message during CSFB to UTRAN

If PS handover is used for CSFB to UTRAN, the eNodeB initiates a PS handover procedureafter receiving a measurement report from the UE, instead of sending an RRC ConnectionRelease message to the UE. Figure 8-4 shows the PS handover procedure. As shown in thered and green boxes in Figure 8-5, in the handover command sent over the air interface, thecs-FallbackIndicator IE is TRUE and the target RAT is UTRAN.

Figure 8-4 PS handover procedure



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Figure 8-5 The MobilityFromEUTRAN message during CSFB to UTRAN

MML Command Observation

The activation observation procedure for load-based CSFB to UTRAN is as follows: Run theDSP UTRANRIMLOADINFO command to query neighboring UTRAN cell load status tocheck whether load-based CSFB has been activated.

If the neighboring UTRAN cell load status is displayed, load-based CSFB has been activated.

Counter Observation

Table 8-3 lists the performance counters for observing functions related to CSFB to UTRAN.

Table 8-3 Performance counters for observing CSFB to UTRAN

Function CounterID

CounterName

Description

CSFB toUTRAN

1526728323

L.CSFB.E2W Number of times CSFB to UTRAN isperformed

CSFB toUTRANtriggered foremergency calls

1526728709

L.CSFB.E2W.Emergency

Number of times CSFB to UTRAN istriggered for emergency calls

RIM duringload-basedCSFB toUTRAN

1526728949

L.RIM.Load.E2W.Req

Number of load information requestssent from an eNodeB to a UMTSnetwork

1526728950

L.RIM.Load.E2W.Resp

Number of load information responsessent from a UMTS network to aneNodeB

1526728951

L.RIM.Load.E2W.Update

Number of load information updatessent from a UMTS network to aneNodeB



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8.1.7 DeactivationTable 8-4 describes the parameters for deactivating this feature.

Table 8-4 Parameters for deactivating CSFB to UTRAN

MO Parameter Group Setting Notes

ENodeBAlgoSwitch HoAlgoSwitch To deactivate load-based CSFB toUTRAN, set CSFBLoadInfoSwitchof the HoAlgoSwitch parameter to 0.

CellAlgoSwitch HoAllowedSwitch To deactivate CSFB to UTRAN, setUtranCsfbSwitch of theHoAlgoSwitch parameter to 0.To deactivate only adaptive-blind-handover-based CSFB,Set CsfbAdaptiveBlindHoSwitch to0.

This feature can be deactivated using the CME or MML commands.

8.1.7.1 Using the CME

For detailed operations, see CME-based Feature Configuration.


Using MML Commandsl Deactivating CSFB to UTRAN

Run the MOD CELLALGOSWITCH command with theUtranCsfbSwitch(UtranCsfbSwitch) option of the Handover Allowed Switchparameter cleared.

l Deactivating only load-based CSFB to UTRANRun the MOD ENODEBALGOSWITCH command with theCSFBLoadInfoSwitch(CSFBLoadInfoSwitch) option of the Handover Algo switchparameter cleared.

l Deactivating adaptive-blind-handover-based CSFBRun the MOD CELLALGOSWITCH command with theCsfbAdaptiveBlindHoSwitch(CsfbAdaptiveBlindHoSwitch) option of the HandoverAllowed Switch parameter cleared.

MML Command Examplesl Deactivating CSFB to UTRAN

MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=UtranCsfbSwitch-0;

l Deactivating only load-based CSFB to UTRANMOD ENODEBALGOSWITCH: HoAlgoSwitch=CSFBLoadInfoSwitch-0;



85

l Deactivating adaptive-blind-handover-based CSFBMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch= CsfbAdaptiveBlindHoSwitch-0;

8.1.8 Performance MonitoringCSFB is an end-to-end service. The performance counters on the LTE side can only indicatethe success rate of the CSFB procedure on the LTE side, and. they cannot indicate the successrate of the CSFB procedure on the target side. Therefore, the performance counters on theLTE side cannot directly show user experience of the CSFB procedure. It is recommendedthat you perform drive tests and use the performance counters on the UE side to indicate theactual user experience of the CSFB procedure.

Table 8-5 lists counters related to the execution of CSFB by the eNodeB.

Table 8-5 Counters related to the execution of CSFB by the eNodeB

Counter ID Counter Name Description

1526728321 L.CSFB.PrepAtt Number of CSFB indicators received bythe eNodeB

1526728322 L.CSFB.PrepSucc Number of successful CSFB responsesfrom the eNodeB

Table 8-6 lists the counter related to CSFB to UTRAN.

Table 8-6 Counter related to CSFB to UTRAN


1526728323 L.CSFB.E2W Number of procedures for CSFB toWCDMA network

Table 8-7 lists the counters that indicate whether CSFB is performed through redirection orhandover.

Table 8-7 Counters related to CSFB through redirection or handover


1526728497 L.RRCRedirection.E2W.CSFB

Number of CSFB-based redirections from E-UTRANs to WCDMA network

1526728504 L.IRATHO.E2W.CSFB.PrepAttOut

Number of CSFB-based inter-RAT handoverpreparation attempts from E-UTRAN toWCDMA network

After the CSFB protection timer expires, the eNodeB may perform a blind redirection to enterthe protection procedure. Table 8-8 lists the counter related to the number of times that the



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eNodeB enters the protection procedure for CSFB. A larger value of this counter indicates alonger average UE access delay during CSFB.

Table 8-8 Counter related to the number of times that the eNodeB enters the protectionprocedure for CSFB


1526729515 L.RRCRedirection.E2W.CSFB.TimeOut

Number of CSFB-based blind redirectionsfrom E-UTRAN to WCDMA networkcaused by CSFB protection timer expiration

Table 8-9 lists the counters related to CSFB for emergency calls.

Table 8-9 Counters related to CSFB for emergency calls


1526729510 L.IRATHO.E2W.CSFB.ExecAttOut.Emergency

Number of CSFB-based handover executionattempts to WCDMA network triggered foremergency calls

1526729511 L.IRATHO.E2W.CSFB.ExecSuccOut.Emergency

Number of successful CSFB-based handoverexecutions to WCDMA network triggeredfor emergency calls

The formula for calculating the CSFB handover success rate for emergency calls is asfollows:

CSFB handover success rate for emergency calls =L.IRATHO.E2W.CSFB.ExecSuccOut.Emergency/L.IRATHO.E2W.CSFB.ExecAttOut.Emergency

8.1.9 Parameter OptimizationCSFB end-to-end delay includes the processing time at the LTE side and that at the target sideof fallback. Processing at any side may affect the CSFB end-to-end delay and user experience.

l If GSM devices are provided by Huawei, for details about processing at the GSM side,see Interoperability Between GSM and LTE Feature Parameter Description.

l If UMTS devices are provided by Huawei, for details about processing at the UMTSside, see Interoperability Between UMTS and LTE Feature Parameter Description.

Blind Handover for CSFB

Compared with measurement-based handovers, blind handovers reduce access delays butaffect handover success rates.

The following table describes the parameters in the CSFallBackBlindHoCfg MO used to setthe blind-handover priorities of different RATs for CSFB.



87

ParameterName

ParameterID

DataSource

Setting Notes

CNOperatorID



Set this parameter based on the network plan.This parameter specifies the ID of the operatorwhose RAT blind-handover priorities are to beset.




Set this parameter based on the network plan.This parameter is set to UTRAN by default andspecifies the highest-priority RAT to beconsidered in blind handovers for CSFB.




Set this parameter based on the network plan.This parameter is set to GERAN by default andspecifies the second-highest-priority RAT to beconsidered in blind handovers for CSFB. Ensurethat this parameter is set to a different value fromthe CSFallBackBlindHoCfg.InterRatHighest-Pri and CSFallBackBlind-HoCfg.InterRatLowestPri parameters.




Set this parameter based on the network plan.This parameter is set to CDMA2000 by defaultand specifies the lowest-priority RAT to beconsidered in blind handovers for CSFB. Ensurethat this parameter is set to a different value fromthe CSFallBackBlindHoCfg.InterRatHighest-Pri and CSFallBackBlind-HoCfg.InterRatSecondPri parameters.

The following table describes the parameters that must be set in the ENodeBAlgoSwitch andCellHoParaCfg MOs to set eNodeB- and cell-level blind handovers.

ParameterName

Parameter ID

DataSource

Setting Notes

HandoverMode switch



To activate blind handovers, select theBlindHoSwitch(BlindHoSwitch) option. Ablind handover to an inter-RAT cell can beperformed only if a blind-handover priority isspecified for the inter-RAT cell. Compared withmeasurement-based handovers, blind handoversreduce access delays but affect handover successrates.To deactivate blind handovers, clear theBlindHoSwitch(BlindHoSwitch) option.



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ParameterName

Parameter ID

DataSource

Setting Notes

HandoverMode switch



To activate blind handovers for a cell under theeNodeB, select theBlindHoSwitch(BlindHoSwitch) option of theparameter. If theBlindHoSwitch(BlindHoSwitch) option iscleared, blind handovers for the cell are invalid.

Measurement-based Handovers for CSFBAn appropriate event B1 threshold for CSFB ensures that inter-RAT handovers are triggeredin a timely fashion. A high threshold results in a low probability of triggering event B1,thereby affecting user experience. A low threshold results in a high probability of triggeringevent B1, but causes a high probability of incorrect handover decisions and a low handoversuccess rate. Tune this parameter based on site conditions.

Event B1 for CSFB has a time-to-trigger parameter. This parameter lowers the probability ofincorrect handover decisions and raises the handover success rate. However, if the value ofthis parameter is too large, CSFB delay is extended, affecting user experience. Tune thisparameter based on site conditions.

Appropriate settings of the threshold and time-to-trigger for event B1 raise the handoversuccess rate and lower the call drop rate. The following table describes the parameters thatmust be set in the CSFallBackHo MO.

Related parameters are in the CSFallBackHo MO.

Parameter Name

ParameterID

DataSource

Setting Notes

Local cellID

CSFallBackHo.LocalCellId


Set this parameter based on the network plan.



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Parameter Name

ParameterID

DataSource

Setting Notes

CSFBUtranEventB1Time ToTrig

CSFallBackHo.CsfbHoUtranTimeToTrig


Set this parameter based on the network plan. Thisparameter specifies the time-to-trigger for eventB1 in CSFB to UTRAN. When CSFB to UTRANis required, set this parameter, which is used byUEs as one of the conditions for triggering eventB1. When a UE detects that the signal quality in atleast one UTRAN cell meets the enteringcondition, it does not immediately send ameasurement report to the eNodeB. Instead, theUE sends a measurement report only when thesignal quality has been meeting the enteringcondition throughout a period defined by thisparameter. This parameter helps decrease thenumber of occasionally triggered event reports,the average number of handovers, and the numberof incorrect handovers, preventing unnecessaryhandovers.

CSFBUTRANEventB1RSCPTriggerThreshold

CSFallBackHo.CsfbHoUtranB1ThdRscp


Set this parameter based on the network plan. Thisparameter specifies the RSCP threshold for eventB1 in CSFB to UTRAN. When CSFB to UTRANis required, set this parameter, which is used byUEs as one of the conditions for triggering eventB1. This parameter specifies the minimumrequired RSCP of the signal quality provided by aUTRAN cell when a CSFB procedure can beinitiated toward this cell. Event B1 is triggeredwhen the RSCP measured by the UE is higherthan the value of this parameter and all otherconditions are also met.

CSFBUTRANEventB1ECN0TriggerThreshold

CSFallBackHo.CsfbHoUtranB1ThdEcn0


Indicates the Ec/No threshold for event B1, whichis used in CS fallback to UTRAN. When CSFB toUTRAN is required, set this parameter, which isused by UEs as one of the conditions fortriggering event B1. This parameter specifies theminimum required Ec/No of the signal qualityprovided by a UTRAN cell when a CSFBprocedure can be initiated toward this cell. EventB1 is triggered when the Ec/No measured by theUE is higher than the value of this parameter andall other conditions are also met. Set thisparameter to a large value for a cell with a largesignal fading variance in order to reduce theprobability of unnecessary handovers. Set thisparameter to a small value for a cell with a smallsignal fading variance in order to ensure timelyhandovers.



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8.2 RIM Procedure from E-UTRAN to UTRAN

8.2.1 When to Use RIM Procedure from E-UTRAN to UTRANIt is recommended that the RIM procedure be performed through the Huawei-proprietaryeCoordinator when the following conditions are met:

l Both the eNodeB and the RNC/BSC are provided by Huawei and are connected to thesame eCoordinator.

l The core network that the eNodeB and the RNC/BSC are connected to does not supportthe RIM procedure or is not enabled with the RIM procedure.

To perform the RIM procedure through the eCoordinator, setENodeBAlgoSwitch.RimOnEcoSwitch to ON(On).

In other conditions, it is recommended that the RIM procedure be performed through the corenetwork. In this case, set ENodeBAlgoSwitch.RimOnEcoSwitch to OFF(Off).

If load-based CSFB to UTRAN is used, you need to obtain load information about UTRANcells through the RIM procedures. If flash CSFB to UTRAN is used, you need to obtainsystem information about UTRAN cells through the RIM procedures.

8.2.2 Required InformationCheck whether the RNC, MME, and SGSN support the RIM procedure, and whether aneCoordinator has been deployed.

8.2.3 Requirements

Operating Environment

If the RIM procedure is performed through the core network, the core-network equipmentmust support this feature:

l For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is notfor eRAN3.0, messages may not be parsed.

l For a third party's EPC, the EPC must support CSFB complying with 3GPP Release 9.Check that software versions for the EPC are correct.

If the RIM procedure is performed through the eCoordinator, the RNC/BSC, eNodeB, andeCoordinator must all be provided by Huawei and with the switch for supporting the RIMprocedure through eCoordinator turned on.

To facilitate connection setup for RIM message exchange, you must enable RIM in theUTRAN before you enable it in the E-UTRAN.

License

The operator has purchased and activated the licenses for the features listed in Table 8-10.



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Table 8-10 License control item for CSFB to UTRAN



NE Sales Unit

TDLOFD-001033

CS Fallbackto UTRAN

LT1ST0CFBU00

CS FallbacktoUTRAN(TDD)


NOTE

If the UTRAN uses Huawei devices, corresponding licenses need to be activated. For details, see theengineering guidelines for WRFD-150231 RIM Based UMTS Target Cell Selection for LTE inInteroperability Between UMTS and LTE Feature Parameter Description.



8.2.5.1 Data Preparation

This section describes the data that you need to collect for setting parameters. Required data isdata that you must collect for all scenarios. Collect scenario-specific data when necessary fora specific feature deployment scenario.





Required Data

The required data is the same as that for TDLOFD-001033 CS Fallback to UTRAN. Fordetails, see 8.1.5.1 Data Preparation.

UtranExternalCell: used to configure external UTRAN cells. The UtranExternalCell.Racparameter must be set.

Scenario-specific Data

The following table describes the parameter that must be set in the ENodeBAlgoSwitch MOto configure the RIM procedure.



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ParameterName

ParameterID

DataSource

Setting Notes

Support RIMbyeCoordinatorSwitch

ENodeBAlgoSwitch.RimOnEcoSwitch


If ENodeBAlgoSwitch.RimOnEcoSwitchis set to OFF(Off), the RIM procedure isperformed through the core network.If ENodeBAlgoSwitch.RimOnEcoSwitchis set to ON(On), the RIM procedure isperformed through the eCoordinator.




Using MML Commandsl Performing the RIM procedure through the core network

Run the MOD ENODEBALGOSWITCH command with the Support RIM byeCoordinator Switch parameter set to OFF(Off).

l Performing the RIM procedure through the eCoordinatorRun the MOD ENODEBALGOSWITCH command with the Support RIM byeCoordinator Switch parameter set to ON(On).

MML Command Examplesl Performing the RIM procedure through the core network

MOD ENODEBALGOSWITCH: RimOnEcoSwitch=OFF;l Performing the RIM procedure through the eCoordinator

MOD ENODEBALGOSWITCH: RimOnEcoSwitch=ON;


Counter Observation

No matter whether the RIM procedure is performed through the core network or theeCoordinator, performance counters listed in Table 8-11 can be used to observe whether theRIM procedure has taken effect.

Table 8-11 Counters related to the RIM procedure between E-UTRAN and UTRAN


1526728949 L.RIM.Load.E2W.Req

Number of load information requests from aneNodeB to WCDMA network

1526728950 L.RIM.Load.E2W.Resp

Number of times the eNodeB receives loadinformation responses from WCDMAnetwork



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1526728951 L.RIM.Load.E2W.Update

Number of times the eNodeB receives loadinformation updates from WCDMA network

Signaling Tracing Result Observation

If the RIM procedure is performed through the core network, trace signaling messages asfollows:

Step 1 Start an S1 interface tracing task on the eNodeB LMT.

Check whether the ENB DIRECT INFORMATION TRANSFER message containing theRAN-INFORMATION-REQUEST IE is sent over the S1 interface. If the message is sent, youcan infer that the eNodeB has sent the RIM request successfully.

Step 2 Start an Iu interface tracing task on the RNC LMT.

If after receiving the DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION-REQUEST IE, the RNC sends the DIRECT INFORMATION TRANSFERmessage containing the RAN-INFORMATION IE to the SGSN, you can infer that the RNCcan response to the RIM request normally.

Step 3 Change the state of the UTRAN cell.

If the RNC sends the DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION IE over the Iu interface, you can infer that the RNC can notify the eNodeBwith the cell state change through the RIM procedure.

----End

If the RIM procedure is performed through the eCoordinator, trace signaling messages asfollows:

Step 1 Start an Se interface tracing task on the eNodeB LMT.

Check whether the ENB DIRECT INFORMATION TRANSFER message containing theRAN-INFORMATION-REQUEST IE is sent over the Se interface. If the message is sent, youcan infer that the eNodeB has sent the RIM request successfully.

Step 2 Start an Sr interface tracing task on the RNC LMT.

If after receiving the ECO DIRECT INFORMATION TRANSFER message containing theRAN-INFORMATION-REQUEST IE, the RNC sends the RNC DIRECT INFORMATIONTRANSFER message containing the RAN-INFORMATION IE to the eCoordinator, you caninfer that the RNC can response to the RIM request normally.

Step 3 Change the state of the UTRAN cell.

If the RNC sends the RNC DIRECT INFORMATION TRANSFER message containing theRAN-INFORMATION IE over the Sr interface, you can infer that the RNC can notify theeNodeB with the cell state change through the RIM procedure.

----End



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Table 8-12 Parameters for the RIM procedure


ENodeBAlgoSwitch(eNodeB-levelswitch)

RimOnEcoSwitch Set this parameter to OFF(Off).


8.2.7.1 Using the CMEFor detailed operations, see CME-based Feature Configuration.



Run the MOD ENODEBALGOSWITCH command with the Support RIM byeCoordinator Switch parameter set to ON(On).

l Performing the RIM procedure through the eCoordinatorRun the MOD ENODEBALGOSWITCH command with the Support RIM byeCoordinator Switch parameter set to OFF(Off).


MOD ENODEBALGOSWITCH: RimOnEcoSwitch=ON;l Performing the RIM procedure through the eCoordinator

MOD ENODEBALGOSWITCH: RimOnEcoSwitch=OFF;

8.2.8 Performance MonitoringThe performance monitoring procedure for this feature is the same as that for CSFB toUTRAN. For details, see 8.1.8 Performance Monitoring.

8.2.9 Parameter OptimizationThe parameter optimization procedure for this feature is the same as that for CSFB toUTRAN. For details, see 8.1.9 Parameter Optimization.

8.3 TDLOFD-001052 Flash CS Fallback to UTRANThis section provides engineering guidelines for TDLOFD-001052 Flash CS Fallback toUTRAN.



95

8.3.1 When to Use Flash CS Fallback to UTRANWhen TDLOFD-001033 CS Fallback to UTRAN has been enabled, use TDLOFD-001052Flash CS Fallback to UTRAN if all the following conditions are met: Use this feature whenthe following conditions are met:

l TDLOFD-001033 CS Fallback to UTRAN has been enabled.l The E-UTRAN and UTRAN support the RIM with SIB procedure.l There are UEs that comply with 3GPP Release 9.l The core networks support the RIM procedure or the eCoordinator has been deployed.

For policies on whether to use PS handover or PS redirection for CSFB, see Inter-RATMobility Management in Connected Mode. If UTRAN and E-UTRAN cells cover the samearea, or the UTRAN cell provides better coverage than the E-UTRAN cell, use CSFB basedon blind handover to decrease the CSFB delay.

8.3.2 Required Information1. Collect information about whether TDLOFD-001033 CS Fallback to UTRAN has been

activated.2. Collect the operating frequencies, coverage areas, and configurations of the E-UTRAN

and UTRAN cells. Information about coverage areas includes engineering parameters ofsites (such as latitude and longitude), TX power of cell reference signals, and neighborrelationship configurations.

3. Collect the versions and configurations of the NEs in the E-UTRAN, UTRAN, and corenetworks, and ensure that they all support CSFB and the RIM procedure. Table 8-13describes the requirements of flash CSFB to UTRAN for the core networks. For detailsabout the deployment guide on the UTRAN, see Interoperability Between UMTS andLTE Feature Parameter Description.

4. Collect the following information about the UEs that support UMTS and LTE on the livenetwork:– Supported frequency bands– Whether the UEs support redirection from E-UTRAN to UTRAN– Whether the UEs support PS handover from E-UTRAN to UTRAN– Whether the UEs support UTRAN measurements– Whether the UEs comply with 3GPP Release 9 specificationsThis information is used to configure neighboring UTRAN cells and to determinewhether to perform CSFB based on handover or redirection. For details, see Inter-RATMobility Management in Connected Mode.

Table 8-13 Requirements of flash CSFB to UTRAN for core networks

NE Requirement

MME Supports CSFB and RIM procedures in compliance with 3GPPRelease 9

SGSN Supports CSFB and RIM procedures in compliance with 3GPPRelease 9



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8.3.3 Requirements





Table 8-14 License control item for Flash CS Fallback to UTRAN



NE Sales Unit

TDLOFD-001052

Flash CSFBto UTRAN

LT1SFCSFUT00

Flash CSFallback toUTRAN


NOTE

If the UTRAN uses Huawei devices, RIM-based flash CSFB needs to be enabled on the UTRAN. Fordetails, see Flash CS Fallback Based on RIM Feature Parameter Description.








Required DataBefore configuring CSFB to UTRAN, collect the data related to neighbor relationships withUTRAN cells. This section provides only the information about MOs related to neighboring



97

UTRAN cells and key parameters in these MOs. For more information about how to collectdata for the parameters in these MOs, see Inter-RAT Mobility Management in ConnectedMode Feature Parameter Description. Collect data for the parameters in the following MOs:

1. UtranNFreq: used to configure neighboring UTRAN frequencies.2. UtranExternalCell: used to configure external UTRAN cells. The

UtranExternalCell.Rac parameter must be set.3. UtranExternalCellPlmn: used to configure additional PLMN IDs for each shared

external UTRAN cell. This MO is required only if the NodeB that serves the externalUTRAN cell works in RAN sharing with common carriers mode and multiple operatorsshare the external UTRAN cell.

4. UtranNCell: used to configure the neighboring relationship with a UTRAN cell. If aneighboring UTRAN cell supports blind handovers according to the network plan, theblind-handover priority of the cell must be specified by theUtranNCell.BlindHoPriority parameter.

Scenario-specific DataThe following table describes the parameters that must be set in the CellAlgoSwitch, CellHoParaCfg, and ENodeBAlgoSwitch MOs to set the handover mode and handoveralgorithm switches for flash CSFB to UTRAN.

ParameterName

ParameterID


HandoverMode switch



Set this parameter based on the networkplan.




To activate CSFB to UTRAN, select theUtranCsfbSwitch(UtranCsfbSwitch)and UtranFlashCsfbS-witch(UtranFlashCsfbSwitch)options.



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ParameterName

ParameterID


RIM switch ENodeBAlgoSwitch.RimSwitch


UTRAN_RIM_SWITCH(UTRANRIM Switch) of this parameterspecifies whether to enable or disablethe RIM procedure that requests event-driven multiple reports from UTRANcells.If this switch is turned on, the eNodeBcan send RAN-INFORMATION-REQUEST/Multiple Report protocoldata units (PDUs) to UTRAN cells torequest event-driven multiple reports.If this switch is turned off, the eNodeBcannot send RAN-INFORMATION-REQUEST/Multiple Report PDUs toUTRAN cells.If this switch is turned off andUtranFlashCsfbS-witch(UtranFlashCsfbSwitch) ofENodeBAlgoSwitch.HoAlgoSwitch isturned on, the eNodeB sends RAN-INFORMATION-REQUEST/SingleReport PDUs to UTRAN cells torequest single reports.If the UTRAN cells support RAN-INFORMATION-REQUEST/MultipleReport PDUs, you are advised to selectthe UTRAN_RIM_SWITCH(UTRANRIM Switch) option.


Parameter Name

Parameter ID

DataSource

Setting Notes

Handover Modeswitch




Handover Modeswitch






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The following table describes the parameter that must be set in the S1Interface MO to set thecompliance protocol release of the MME.

Parameter Name Parameter ID Data Source Setting Notes

MME Release S1Interface.MmeRelease


To activate RIMprocedures inMultiple Reportmode, set theparameter toRelease_R9(Release 9).


ParameterName

Parameter ID

DataSource

Setting Notes

CN OperatorID


Networkplan(negotiationnot required)

Set this parameter based on the network plan.This parameter identifies the operator whoseRAT blind-handover priorities are to be set.




Set this parameter based on the network plan.This parameter is set to UTRAN by defaultand specifies the highest-priority RAT to beconsidered in blind handovers for CSFB. ForCSFB to UTRAN, retain the default value.




Set this parameter based on the network plan.This parameter is set to GERAN by defaultand specifies the second-highest-priority RATto be considered in blind handovers for CSFB.Ensure that this parameter is set to a differentvalue from the CSFallBackBlind-HoCfg.InterRatHighestPri andCSFallBackBlindHoCfg.InterRatLowestPriparameters.



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ParameterName

Parameter ID

DataSource

Setting Notes




Set this parameter based on the network plan.This parameter is set to CDMA2000 bydefault and specifies the lowest-priority RATto be considered in blind handovers for CSFB.Ensure that this parameter is set to a differentvalue from the CSFallBackBlind-HoCfg.InterRatHighestPri andCSFallBackBlindHoCfg.InterRatSecondPriparameters.

UTRANLCScapability



Set this parameter based on the network plan.This parameter specifies the LCS capability ofthe UTRAN.

The following table describes the parameter that must be set in the InterRatHoComm MO toset the maximum number of neighboring UTRAN cells whose system information is sent toUEs for flash redirections.

Parameter Name

Parameter ID


Max Utrancell num inredirection

InterRatHoComm.CellInfoMaxUtranCellNum


Set this parameter based on the network plan.The default value is 8. If this parameter is setto a small value, the flash CSFB success ratedecreases because UEs may not receive validneighboring cell system information. If thisparameter is set to a large value, the size ofan RRC connection release messageincreases and CSFB may fail.

Max Utrancell num inCSFBEMCredirection

InterRatHoComm.UtranCellNumForEmcRedirect


To use flash CSFB for emergency blindredirection, change the parameter value fromthe default value 0 to a non-zero value.



Using MML CommandsThe prerequisite is that CSFB to UTRAN has been activated.



101

Step 1 (Optional) Run the MOD GLOBALPROCSWITCH command to set the RIM CodingPolicy parameter.

If the peer device is a Huawei device, go to Step 3.

If the peer device is not a Huawei device, you need to modify the RIM Coding Policyfeature. Run the MOD GLOBALPROCSWITCH command to set the RIM Coding Policyparameter to StandardCoding.

Step 2 Run the MOD CELLALGOSWITCH command with theUtranFlashCsfbSwitch(UtranFlashCsfbSwitch) option of the Handover Allowed Switchparameter selected.

NOTE

In addition, this function is controlled by the UtranFlashCsfbSwitch option of theENodeBAlgoSwitch.HoAlgoSwitch parameter.



Step 3 Run the MOD ENODEBALGOSWITCH command with theUTRAN_RIM_SWITCH(UTRAN RIM Switch) option of the RIM switch parameterselected.

Step 4 Run the MOD S1INTERFACE command with the MME Release parameter set toRelease_R9(Release 9).

Step 5 (Optional) Run the MOD INTERRATHOCOMM command with the Max Utran cell numin redirection parameter set (its default value is 8).

Step 6 (Optional) Run the MOD INTERRATHOCOMM command with the Max Utran cell numin CSFB EMC redirection parameter set, for example, to 3.

----End

MML Command ExamplesMOD GLOBALPROCSWITCH: RimCodingPolicy=PrivateCoding;MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=UtranFlashCsfbSwitch-1;MOD ENODEBALGOSWITCH: RimSwitch=UTRAN_RIM_SWITCH-1;MOD S1INTERFACE: S1InterfaceId=2,S1CpBearerId=1,CnOperatorId=0,MmeRelease=Release_R9;MOD INTERRATHOCOMM: CellInfoMaxUtranCellNum=8;MOD INTERRATHOCOMM: UtranCellNumForEmcRedirect=3;


Signaling Observation

Enable a UE to camp on an E-UTRAN cell and make a voice call. If the call continues and theRRC Connection Release message traced on the Uu interface carries the information aboutneighboring UTRAN cells, flash CSFB to UTRAN has been activated.

The signaling procedure for flash CSFB to UTRAN is similar to that for redirection-basedCSFB to UTRAN described in 8.1.6 Activation Observation. The difference is that the RRCConnection Release message carries the information about neighboring UTRAN cells.



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Check the status of the RIM procedure towards neighboring UTRAN cells by running theDSP UTRANRIMINFO command. If the ID of a neighboring UTRAN cell is displayed inthe command output, the eNodeB has obtained the system information of this neighboringUTRAN cell.

Counter Observation

Table 8-15 lists the performance counters for observing functions related to flash CSFB toUTRAN.

Table 8-15 Performance counters for observing flash CSFB to UTRAN

Function CounterID

Counter Name Description

Flash CSFB toUTRAN

1526728705

L.FlashCSFB.E2W Number of times flashCSFB to UTRAN isperformed

RIM duringflash CSFB toUTRAN

1526728946

L.RIM.SI.E2W.Req Number of systeminformation requests sentfrom an eNodeB to a UMTSnetwork

1526728947

L.RIM.SI.E2W.Resp Number of systeminformation responses sentfrom a UMTS network to aneNodeB

1526728948

L.RIM.SI.E2W.Update Number of systeminformation updates sentfrom a UMTS network to aneNodeB


Table 8-16 Parameters for deactivating flash CSFB to UTRAN


CellAlgoSwitch HoAllowedSwitch Set UtranFlashCsfbSwitch of theHoAlgoSwitch parameter to 0.




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Using MML Commands

Run the MOD CELLALGOSWITCH command with theUtranFlashCsfbSwitch(UtranFlashCsfbSwitch) option of the Handover Allowed Switchparameter cleared.

MML Command ExamplesMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch =UtranFlashCsfbSwitch-0;

8.3.8 Performance MonitoringThe performance monitoring procedure for this feature is the same as that for CSFB toUTRAN. For details, see 8.1.8 Performance Monitoring.


8.4 TDLOFD-081223 Ultra-Flash CSFB to UTRAN

8.4.1 When to Use Ultra-Flash CSFB to UTRANWhen TDLOFD-001033 CS Fallback to UTRAN has been enabled, this feature isrecommended in scenarios where the eNodeB, RNC, MME, and MSC are provided byHuawei, and a proportion of of UEs in the live network support SRVCC from E-UTRAN toUTRAN.

Use this feature in the overlapping coverage of UMTS and LTE networks when the followingconditions are met:

l TDLOFD-001033 CS Fallback to UTRAN has been enabled.l The eNodeB, RNC, MME, and MSC are provided by Huawei.l A proportion of UEs support SRVCC from E-UTRAN to UTRAN.

8.4.2 Required InformationBefore deploying this feature, ensure that:

l TDLOFD-001033 CS Fallback to UTRAN has been enabled.l The eNodeB, RNC, MME, and MSC are provided by Huawei and they all support this

feature.l A proportion of UEs support SRVCC from E-UTRAN to UTRAN.



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8.4.3 Requirements


This feature is a Huawei-proprietary feature and requires that the UTRAN, eNodeB, RNC,MME, and MSC be provided by Huawei and support this feature. This feature is used withMME11.0 and MSC11.0.

License

The operator has purchased and activated the license for the feature listed in Table 8-17.

Table 8-17 License information for ultra-flash CSFB to UTRAN

Feature ID Feature Name Model LicenseControlItem

NE Sales Unit

TDLOFD-081223

Ultra-FlashCSFB toUTRAN(TDD)

LT1SUFCFBU00

Ultra-FlashCSFB toUTRAN(TDD)


NOTE

The license for ultra-flash CSFB needs to be purchased and activated on the UTRAN. For detailedoperations, see the following section in Interoperability Between UMTS and LTE Feature ParameterDescription: Engineering Guidelines > WRFD-160271 Ultra-Flash CSFB.

8.4.4 PrecautionsThis feature is a Huawei-proprietary feature and is not supported by devices provided by othervendors. In addition, this feature must first be activated on the RNC, MME, and MSC, andthen be activated on the eNodeB. This is because this feature is triggered by the eNodeB andthis avoids CSFB failures.









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Required DataThe required data is the same as that for TDLOFD-001033 CS Fallback to UTRAN. Fordetails, see 8.1.5.1 Data Preparation.

Scenario-specific DataThe following table describes the parameter that must be set in the ENodeBAlgoSwitch MOto set the handover mode and handover algorithm switch for ultra-flash CSFB to UTRAN.

ParameterName

ParameterID

DataSource

Setting Notes

HandoverAlgo switch



Select the UtranUltraFlashCsfbS-witch(UtranUltraFlashCsfbSwitch) option.

The following table describes the parameter that must be set in the GlobalProcSwitch MO toturn on the UE compatibility switch when UEs do not support Ultra-Flash CSFB, resulting inUE compatibility problems.

Parameter Name

Parameter ID

DataSource

Setting Notes

UeCompatibilitySwitch

GlobalProcSwitch.UeCompatSwitch

Networkplan(negotiationrequired)

Select the UltraFlashCsfbComOptSw option ofthe parameter when UEs on the network do notsupport ultra-flash CSFB.When the MME provided by Huawei allows IMEIwhitelist configurations for ultra-flash CSFB and theoption is selected, the eNodeB performs ultra-flashCSFB on UEs in the IMEI whitelist. Therefore,delete the UEs that do not support ultra-flash CSFBfrom the whitelist before selecting the option.Otherwise, keep the option unselected.

The following table describes the parameter that must be set in the CellHoParaCfg MO todisable blind handover for UEs supporting ultra-flash CSFB after the blind handover functiontakes effect.



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Parameter Name

Parameter ID


HandoverModeswitch



Select the UFCsfbBlindHoDisSwitch option ifyou want to disable blind handover and enablemeasurement-based handover for UEssupporting ultra-flash CSFB when the blindhandover function takes effect. If this option iscleared, the blind handover function for UEssupporting ultra-flash CSFB that takes effectstill persists.




Using MML Commandsl Ultra-Flash CSFB to UTRAN


Step 2 Run the MOD ENODEBALGOSWITCH command with theUtranUltraFlashCsfbSwitch(UtranUltraFlashCsfbSwitch) option of the Handover Algoswitch parameter selected.

----End

l (Optional) If some operators or RNCs do not support ultra-flash CSFB to UTRAN,perform the following operations:

Step 1 Run the MOD ENODEBALGOSWITCH command with theUtranSepOpMobilitySwitch(UtranSepOpMobilitySwitch) option of the Multi-OperatorControl Switch parameter selected.

Step 2 Run the MOD UTRANNETWORKCAPCFG command with theUltraFlashCsfbCapCfg(UltraFlashCsfbCapCfg) option of the Network CapabilityConfiguration parameter cleared for RNCs that do not support ultra-flash CSFB to UTRAN.

----End

l (Optional) Perform the following operation if UE compatibility risks exist after ultra-flash CSFB is activated.

Step 1 Run the MOD GLOBALPROCSWITCH command with theUltraFlashCsfbComOptSw(UltraFlashCsfbComOptSw) option of the UE CompatibilitySwitch parameter selected.

----End



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l (Optional) Perform the following operation if you need to disable blind handover andenable measurement-based handover for UEs supporting ultra-flash CSFB after the blindhandover function takes effect.

Step 1 Run the MOD CELLHOPARACFG command with the UFCsfbBlindHoDisSwitch optionof the Handover Mode switch parameter selected.

----End

MML Command Examplesl Ultra-Flash CSFB to UTRAN

MOD ENODEBALGOSWITCH: HoAlgoSwitch= UtranUltraFlashCsfbSwitch-1;

l (Optional) If RNCs do not support ultra-flash CSFB to UTRAN, perform the followingoperations:MOD ENODEBALGOSWITCH: MultiOpCtrlSwitch= UtranSepOpMobilitySwitch-1;MOD UTRANNETWORKCAPCFG: Mcc="460", Mnc="32", RncId=0, NetworkCapCfg= UltraFlashCsfbCapCfg-0;ADD UTRANNETWORKCAPCFG: Mcc="460", Mnc="32", RncId=0, NetworkCapCfg= UltraFlashCsfbCapCfg-0;MOD ENODEBALGOSWITCH: MultiOpCtrlSwitch= UtranSepOpMobilitySwitch-1;

l (Optional) Perform the following operation if UE compatibility risks exist after ultra-flash CSFB is activated.MOD GLOBALPROCSWITCH: UeCompatSwitch= UltraFlashCsfbComOptSw-1;

l (Optional) Perform the following operation if you need to disable blind handover andenable measurement-based handover for UEs supporting ultra-flash CSFB after the blindhandover function takes effect.MOD CELLHOPARACFG: HoModeSwitch= UFCsfbBlindHoDisSwitch-1;



The activation observation procedure for ultra-flash CSFB to UTRAN is as follows:

1. Enable a UE to camp on an E-UTRAN cell and originate a voice call so that the UE fallsback to a UTRAN cell and completes the call.

2. Enable a UE to camp on an E-UTRAN cell and receive a voice call so that the UE fallsback to a UTRAN cell and completes the call.

Figure 8-6 shows the ultra-flash CSFB to UTRAN signaling procedure for a mobile-originated call.

Figure 8-7 shows the ultra-flash CSFB to UTRAN signaling procedure for a mobile-terminated call.

The UEs in the left and right sides of the figure are the same UE. The messages on theUTRAN side are only for reference. The UE was in idle mode before the call.

If the UE capability is not included in the Initial Context Setup Request (Initial Context SetupReq in the figures) message, the eNodeB initiates a UE capability transfer procedureimmediately after receiving this message from the MME. If the UE capability is included inthe Initial Context Setup Request message, the eNodeB initiates a UE capability transferprocedure after sending an Initial Context Setup Response (Initial Context Setup Rsp in thefigures) message to the MME.



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Figure 8-6 Ultra-flash CSFB to UTRAN signaling procedure for a mobile-originated call



109

Figure 8-7 Ultra-flash CSFB to UTRAN signaling procedure for a mobile-terminated call

Counter ObservationThe counter listed in Table 8-18 can be viewed to check whether the feature has taken effect.



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Table 8-18 Counter related to ultra-flash CSFB to UTRAN


1526730147 L.IRATHO.CSFB.SRVCC.E2W.ExecAttOut

Triggered by ultra-flash CSFBNumber of SRVCC-based outgoing handoverexecutions from E-UTRAN to WCDMAnetwork for ultra-flash CSFB to UTRAN


Table 8-19 Parameters for ultra-flash CSFB to UTRAN


ENodeBAlgoSwitch(eNodeB-level switch)

HoAlgoSwitch Clear the UtranUltraFlashCsfbS-witch(UtranUltraFlashCsfbSwitch)option.




Using MML CommandsRun the MOD ENODEBALGOSWITCH command with theUtranUltraFlashCsfbSwitch(UtranUltraFlashCsfbSwitch) option of the Handover Algoswitch parameter cleared.

MML Command ExamplesMOD ENODEBALGOSWITCH: HoAlgoSwitch=UtranUltraFlashCsfbSwitch-0;

8.4.8 Performance MonitoringThe performance monitoring procedure for this feature is the same as that for CSFB toUTRAN. For details, see 8.1.8 Performance Monitoring. Table 8-20 describes performancecounters related to ultra-flash CSFB.



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Table 8-20 Performance counters related to ultra-flash CSFB


1526730146 L.IRATHO.CSFB.SRVCC.E2W.PrepAttOut

Number of SRVCC-based outgoing handoverattempts from E-UTRAN to WCDMAnetwork for ultra-flash CSFB


Number of SRVCC-based outgoing handoverexecutions from E-UTRAN to WCDMAnetwork for ultra-flash CSFB

1526730148 L.IRATHO.CSFB.SRVCC.E2W.ExecSuccOut

Number of successful SRVCC-based outgoinghandovers from E-UTRAN to WCDMAnetwork for ultra-flash CSFB

1526736728 L.IRATHO.CSFB.SRVCC.E2W.MMEAbnormRsp

Number of responses for abnormal causesreceived by the eNodeB from the MMEduring handovers from the E-UTRAN toWCDMA networks for ultra-flash CSFB

Execution success rate of handovers for ultra-flash CSFB to UTRAN =(L.IRATHO.CSFB.SRVCC.E2W.ExecSuccOut -L.IRATHO.CSFB.SRVCC.E2W.MMEAbnormRsp)/L.IRATHO.CSFB.SRVCC.E2W.PrepAttOut


8.5 TDLOFD-001068 CS Fallback with LAI to UTRANThis section provides engineering guidelines for TDLOFD-001068 CS Fallback with LAI toUTRAN.

8.5.1 When to Use CS Fallback with LAI to UTRANUse this feature when the following conditions are met:

l TDLOFD-001033 CS Fallback to UTRAN has been enabled.l The E-UTRAN cell has neighboring UTRAN cells that belong to different PLMNs and

supports inter-PLMN handovers, or the E-UTRAN cell has neighboring UTRAN cellsthat have different location area codes (LACs).

If both TDLOFD-001033 CS Fallback to UTRAN and TDLOFD-001034 CS Fallback toGERAN have been enabled, you are advised to enable both TDLOFD-001068 CS Fallbackwith LAI to UTRAN and TDLOFD-001069 CS Fallback with LAI to GERAN.


activated.



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2. Collect the operating frequencies, coverage areas, and configurations of the E-UTRANand UTRAN cells.

3. Collect the versions and configurations of the NEs in the E-UTRAN, UTRAN, and corenetworks, and ensure that they all support CSFB and the MME supports LAI delivery.Table 8-21 describes the requirements of CSFB with LAI to UTRAN for the corenetworks.

4. Collect the following information about the UEs that support UMTS and LTE on the livenetwork:– Supported frequency bands– Whether the UEs support redirection from E-UTRAN to UTRAN– Whether the UEs support PS handover from E-UTRAN to UTRAN– Whether the UEs support UTRAN measurementsThis information is used to configure neighboring UTRAN cells and to determinewhether to perform CSFB based on handover or redirection. For details, see Inter-RATMobility Management in Connected Mode.

Table 8-21 Requirements of CSFB with LAI to UTRAN for core networks

NE Requirement

MME l Supports the SGs interface to the MSC/VLR.l Selects the VLR and location area identity

(LAI) based on the tracking area identity (TAI)of the serving cell.

l Forwards paging messages delivered by theMSC.

l Performs public land mobile network (PLMN)selection and reselection.

l Supports combined EPS/IMSI attach,combined EPS/IMSI detach, and combinedTAU/LAU.

l Routes CS signaling.l Supports SMS over SGs.l Supports LAI delivery.

MSC l Supports combined EPS/IMSI attach.l Supports SMS over SGs.l Forwards paging messages transmitted through

the SGs interface.

SGSN Does not activate ISR during the combinedRAU/LAU procedure initiated by the UE.



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8.5.3 Requirements





Table 8-22 License information for CSFB with LAI to UTRAN

FeatureID

Feature Name Model LicenseControl Item

NE Sales Unit

TDLOFD-001068

CS Fallback withLAI to UTRAN

LT1SUCSLAI00

CS Fallbackwith LAI toUTRAN

eNodeB

per RRCConnectedUser


8.5.5 Data Preparation and Feature ActivationCSFB with LAI to UTRAN is automatically activated when two conditions are met: Thelicense for this feature has been purchased. CSFB to UTRAN has been activated.

8.5.5.1 Data PreparationData preparation for activating CSFB with LAI to UTRAN is the same as that for activatingCSFB to UTRAN. For details, see 8.1.5.1 Data Preparation.


8.5.5.3 Using MML CommandsFor details, see 8.1.5.3 Using MML Commands.

8.5.6 Activation ObservationThe activation observation procedure is as follows:

1. Configure two neighboring UTRAN cells with different LAIs for an E-UTRAN cell, andenable the MME to include only one of the two LAIs in the instructions that will bedelivered to the eNodeB.



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2. Ensure that the signal strengths of the two UTRAN cells both reach the threshold forevent B1. You can query the threshold by running the LSTINTERRATHOUTRANGROUP command.

3. Enable a UE to camp on an E-UTRAN cell and originate a voice call so that the UE fallsback to the UTRAN cell with the specified LAI and completes the call.

4. Enable the UE to camp on the E-UTRAN cell and receive a voice call so that the UEfalls back to the UTRAN cell with the specified LAI and completes the call.You can observe the signaling procedure for CSFB with LAI to UTRAN, which issimilar to that for CSFB to UTRAN described in 8.1.6 Activation Observation. Thedifference is that the Initial Context Setup Request or UE Context Mod Request messagecarries the LAI that the MME delivers to the eNodeB, as shown in the following figure:

Figure 8-8 LAI signaling tracing

8.5.7 DeactivationTDLOFD-001068 CS Fallback with LAI to UTRAN is automatically deactivated when itslicense or CSFB to UTRAN is deactivated. For details about how to deactivate CSFB toUTRAN, see 8.1.7 Deactivation.

8.5.8 Performance MonitoringThe performance monitoring procedure for this feature is the same as that for CSFB toUTRAN. For details, see 8.1.8 Performance Monitoring. You can observe deliveredfrequencies or cells based on network logs.


8.6 TDLOFD-001088 CS Fallback Steering to UTRANThis section provides engineering guidelines for TDLOFD-001088 CS Fallback Steering toUTRAN.

8.6.1 When to Use CS Fallback Steering to UTRANUse this feature to improve the network efficiency when the following conditions are met:

l TDLOFD-001033 CS Fallback to UTRAN has been enabled.



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l An operator owns multiple UTRAN frequencies or the operator has different handoverpolicies for CS-only services and combined CS+PS services.

If the operator owns both UTRAN and GERAN, you can also activate TDLOFD-001089 CSFallback Steering to GERAN to improve the network efficiency.


activated.

2. Collect the following information about the UEs that support UMTS and LTE on the livenetwork:


– Whether the UEs support redirection from E-UTRAN to UTRAN

– Whether the UEs support PS handover from E-UTRAN to UTRAN

– Whether the UEs support UTRAN measurements

This information is used to configure neighboring UTRAN cells and to determinewhether to perform CSFB based on handover or redirection. For details, see Inter-RATMobility Management in Connected Mode.

3. Collect information about the frequencies and frequency policies of the UTRAN. Thefrequency policies for UTRAN and E-UTRAN must be the same. For example, if F1 isthe preferred frequency for voice services on UTRAN, the same configuration isrecommended for E-UTRAN.

4. If LOFD-001089 CS Fallback Steering to GERAN is also to be activated, consider theGERAN frequencies when making frequency policies.

8.6.3 Requirements


for eRAN3.0, messages may not be parsed.


License


Table 8-23 License information for CSFB steering to UTRAN

FeatureID

Feature Name Model LicenseControl Item

NE Sales Unit

TDLOFD-001088

CS FallbackSteering toUTRAN

LT1STCSFSU00

CS FallbackSteering toUTRAN

eNodeB




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Required Data

The required data is the same as that for LOFD-001033 CS Fallback to UTRAN. For details,see 8.1.5.1 Data Preparation.


The following table describes the parameter that must be set in the CellAlgoSwitch MO toenable CSFB steering to UTRAN.

Parameter Name

Parameter ID

DataSource

Setting Notes




Select the UtranCsfbSteeringS-witch(UtranCsfbSteeringSwitch) option of thisparameter.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfgMO to set RAT priorities for CSFB triggered for RRC_CONNECTED UEs.

Parameter Name

Parameter ID


CNOperatorID






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Parameter Name

Parameter ID





Set this parameter based on the network plan.This parameter is set to UTRAN by defaultand specifies the highest-priority RAT to beconsidered in blind handovers for CSFB. ForCSFB to UTRAN, retain the default value.




Set this parameter based on the network plan.This parameter is set to GERAN by defaultand specifies the second-highest-priority RATto be considered in blind handovers forCSFB. Ensure that this parameter is set to adifferent value from the CSFallBackBlind-HoCfg.InterRatHighestPri andCSFallBackBlindHoCfg.InterRatLowestPriparameters.




Set this parameter based on the network plan.This parameter is set to CDMA2000 bydefault and specifies the lowest-priority RATto be considered in blind handovers forCSFB. Ensure that this parameter is set to adifferent value from the CSFallBackBlind-HoCfg.InterRatHighestPri andCSFallBackBlindHoCfg.InterRatSecondPriparameters.

UTRANLCScapability



Set this parameter based on the network plan.This parameter specifies the LCS capabilityof the UTRAN.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfgMO to set RAT priorities for CSFB triggered for RRC_IDLE UEs.

ParameterName

ParameterID

DataSource

Setting Notes

CSFBHighestpriorityInterRat forIdleUE

CSFallBackBlindHoCfg.IdleCsfbHighestPri


Set this parameter based on the network plan. Thisparameter is set to UTRAN by default and specifiesthe highest-priority RAT to be considered in CSFB forUEs in idle mode. For CSFB to UTRAN, retain thedefault value.



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ParameterName

ParameterID

DataSource

Setting Notes

CSFBSecondpriorityInterRat forIdleUE

CSFallBackBlindHoCfg.IdleCsfbSecondPri


Set this parameter based on the network plan. Thisparameter is set to GERAN by default and specifiesthe second-highest-priority RAT to be considered inCSFB for UEs in idle mode. Ensure that thisparameter is set to a different value from theCSFallBackBlindHoCfg.IdleCsfbHighestPri andCSFallBackBlindHoCfg.IdleCsfbLowestPriparameters.

CSFBLowestpriorityInterRat forIdleUE

CSFallBackBlindHoCfg.IdleCsfbLowestPri


Set this parameter based on the network plan. Thisparameter is set to CDMA2000 by default andspecifies the lowest-priority RAT to be considered inCSFB for UEs in idle mode. Ensure that thisparameter is set to a different value from theCSFallBackBlindHoCfg.IdleCsfbHighestPri andCSFallBackBlindHoCfg.IdleCsfbSecondPriparameters.

The following table describes the parameters that must be set in the CELLOPHOCFG MOto set cell-level RAT priorities for CSFB triggered for RRC_CONNECTED and RRC_IDLEUEs.

ParameterName

ParameterID

DataSource

Setting Notes

CNOperator ID




Localcell ID



Set this parameter based on the network plan. Thisparameter identifies the cell whose RAT blind-handover priorities are to be set.



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ParameterName

ParameterID

DataSource

Setting Notes












Set this parameter based on the network plan. Thisparameter is set to CDMA2000 by default andspecifies the lowest-priority RAT to be considered inblind handovers for CSFB. Ensure that this parameteris set to a different value from theCellOpHoCfg.InterRatHighestPri andCellOpHoCfg.InterRatSecondPri parameters.


CellOpHoCfg.IdleCsfbHighestPri




CellOpHoCfg.IdleCsfbSecondPri


Set this parameter based on the network plan. Thisparameter is set to GERAN by default and specifiesthe second-highest-priority RAT to be considered inblind handovers for CSFB. Ensure that this parameteris set to a different value from theCellOpHoCfg.IdleCsfbHighestPri andCellOpHoCfg.IdleCsfbLowestPri parameters.



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ParameterName

ParameterID

DataSource

Setting Notes


CellOpHoCfg.IdleCsfbLowestPri


Set this parameter based on the network plan. Thisparameter is set to CDMA2000 by default andspecifies the lowest-priority RAT to be considered inblind handovers for CSFB. Ensure that this parameteris set to a different value from theCellOpHoCfg.IdleCsfbHighestPri andCellOpHoCfg.IdleCsfbSecondPri parameters.

The following table describes the parameter that must be set in the UtranNFreq MO to setthe CS service priority of a neighboring UTRAN frequency considered for RRC_IDLE UEs.

ParameterName

ParameterID

DataSource

Setting Notes

CSservicepriority

UtranNFreq.CsPriority


Set this parameter based on the network plan. If thisparameter is set to Priority_0(Priority 0) for theUTRAN frequency, the eNodeB does not select thefrequency for SRVCC. The valuesPriority_16(Priority 16) and Priority_1(Priority 1)indicate the highest and lowest SRVCC priority,respectively. Set a high priority for a UTRANfrequency with good coverage.

The following table describes the parameter that must be set in the UtranNFreq MO to setthe CS+PS combined service priority of a neighboring UTRAN frequency forRRC_CONNECTED UEs.

ParameterName

ParameterID

DataSource

Setting Notes

CS andPSmixedpriority

UtranNFreq.CsPsMixedPriority


Set this parameter based on the network plan. Ifthis parameter is set to Priority_0(Priority 0) forthe UTRAN frequency, the eNodeB does notselect the frequency for SRVCC. The valuesPriority_16(Priority 16) andPriority_1(Priority 1) indicate the highest andlowest SRVCC priority, respectively. Set a highpriority for a UTRAN frequency with goodcoverage.



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The following table describes the parameter that must be set in the CSFallBackPolicyCfgMO to set the CSFB policy for RRC_CONNECTED UEs.

ParameterName

ParameterID

DataSource

Setting Notes




Set this parameter based on the network plan. Thedefault values are REDIRECTION, CCO_HO, andPS_HO. You are advised to set this parameter basedon the UE capabilities and network capabilities. Fordetails about how to select a CSFB handover policy,see 3.6 Execution.

The following table describes the parameter that must be set in the CSFallBackPolicyCfgMO to set the CSFB policy for RRC_IDLE UEs.

ParameterName

ParameterID

DataSource

Setting Notes

CSFBhandoverpolicyConfigurationfor idleue

CSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg






Using MML Commands

The configurations in this section are examples, and configurations on the live network candiffer from the examples.

Scenario 1: The UTRAN and GERAN cover the same area and provide contiguous coverage.

Step 1 Run the MOD CELLALGOSWITCH command with theUtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch) andGeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch) options of the Handover AllowedSwitch parameter selected.



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NOTE

This function is also controlled by the UtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch) andGeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch) options of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.



Step 2 Run the MOD CSFALLBACKBLINDHOCFG command with the Highest priorityInterRat, Second priority InterRat, CSFB Highest priority InterRat for Idle UE, andCSFB Second priority InterRat for Idle UE parameters to UTRAN, GERAN, GERAN,and UTRAN, respectively.

Step 3 Run the MOD CSFAllBACKPOLICYCFG command with the PS_HO option of the CSFBhandover policy Configuration parameter and the REDIRECTION option of the CSFBhandover policy Configuration for idle ue parameter selected.

----End

Scenario 2: The UTRAN and GERAN cover the same area, and the GERAN providescontiguous coverage but the UTRAN does not. In this scenario, the eNodeB may not receivemeasurement reports after delivering UTRAN measurement configurations. When the CSFBprotection timer expires, the UE is redirected to the GERAN.

Step 1 The feature activation procedure is as follows: Run the MOD GERANNCELL commandwith the blind handover priority specified for the neighboring GERAN cell.

Step 2 To enable UTRAN CSFB steering through cell-level commands, perform the followingoperations:l Run the MOD CELLALGOSWITCH command with the

UtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch) andGeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch) options of the HandoverAllowed Switch parameter selected.

NOTE

This function is also controlled by the UtranCsfbSteeringSwitch(UtranCsfbSteeringSwitch)and GeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch) options of the eNodeB-levelparameter ENodeBAlgoSwitch.HoAlgoSwitch.


The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended thatthe eNodeB-level parameter be turned off and the cell-level parameter be used.

l Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of theHandover Mode switch parameter cleared.

Step 3 Run the MOD CSFALLBACKBLINDHOCFG command with parameters set as followsbased on the network conditions and policies: Set the Highest priority InterRat parameter toUTRAN. Set the Second priority InterRat parameter to GERAN. Set the CSFB Highestpriority InterRat for Idle UE parameter to UTRAN. Set the CSFB Second priorityInterRat for Idle UE parameter to GERAN.

Step 4 Run the MOD CSFALLBACKPOLICYCFG command with the REDIRECTION optionof the CSFB handover policy Configuration parameter selected.

----End



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MML Command Examples

Scenario 1: The UTRAN and GERAN cover the same area and provide contiguous coverage.

MOD CELLALGOSWITCH: LocalCellId=0, HoAllowedSwitch =UtranCsfbSteeringSwitch-1&GeranCsfbSteeringSwitch-1;MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN,InterRatSecondPri=GERAN,IdleCsfbHighestPri=GERAN,IdleCsfbSecondPri=UTRAN;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-1, IdleModeCsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;

Scenario 2: The UTRAN and GERAN cover the same area, and the GERAN providescontiguous coverage but the UTRAN does not.

MOD GERANNCELL: LocalCellId=1, Mcc="460", Mnc="20", Lac=12, GeranCellId=16,BlindHoPriority=32;MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch = UtranCsfbSwitch-1&GeranCsfbSwitch-1, HoAllowedSwitch =UtranCsfbSteeringSwitch-1&GeranCsfbSteeringSwitch-1;MOD CELLHOPARACFG: LocalCellId=0,HoModeSwitch=BlindHoSwitch-0;MOD CSFALLBACKBLINDHOCFG:CnOperatorId=0,InterRatHighestPri=UTRAN,InterRatSecondPri=GERAN,IdleCsfbHighestPri=UTRAN,IdleCsfbSecondPri=GERAN;MOD CSFALLBACKPOLICYCFG:CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0,IdleModeCsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;

8.6.6 Activation ObservationThe signaling procedure is the same as that for CSFB to UTRAN. After CS Fallback Steeringto UTRAN is used, check whether it works as expected.

The activation observation procedure for CSFB steering to UTRAN is as follows:

1. Check that the UE supports redirection-based CSFB and handover-based CSFB.

2. Set CSFB policies for RRC_IDLE UEs and RRC_CONNECTED UEs to redirection andhandover, respectively.

3. Enable the UE to initiate a voice call in idle mode and in connected mode.

4. Observe the counters L.CSFB.E2W, L.RRCRedirection.E2W.CSFB, andL.IRATHO.E2W.CSFB.ExecAttOut. If the values of the counters increase by 2, 1, and1, respectively, CSFB steering to UTRAN has been activated.

If TDLOFD-001089 CS Fallback Steering to GERAN has also been activated, the activationobservation procedure is as follows:

1. Check that the UE supports CSFB to GERAN and CSFB to UTRAN.

2. Set GERAN as the highest-priority RAT for CSFB triggered for RRC_IDLE UEs andUTRAN as the highest-priority RAT for CSFB triggered for RRC_CONNECTED UEs.

3. Enable the UE to initiate a voice call in idle mode and in connected mode.

4. Observe the counters L.CSFB.E2W and L.CSFB.E2G. If both the values increase by 1,both CSFB steering to UTRAN and CSFB steering to GERAN have been activated.




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Table 8-24 Parameters for deactivating CSFB steering to UTRAN


CellAlgoSwitch HoAllowedSwitch Set UtranCsfbSteeringSwitch of theHoAlgoSwitch parameter to 0.





Using MML Commands

Run the MOD CELLALGOSWITCH command with the UtranCsfbSteeringSwitch optionof the Handover Allowed Switch parameter cleared.

MML Command ExamplesMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch =UtranCsfbSteeringSwitch-0;

8.6.8 Performance MonitoringThe performance monitoring procedure for this feature is the same as that for CSFB toUTRAN. For details, see 8.1.8 Performance Monitoring. You can observe deliveredfrequencies and fallback RATs based on network logs.


8.7 TDLOFD-001078 E-UTRAN to UTRAN CS/PS SteeringThis section provides engineering guidelines for TDLOFD-001078 E-UTRAN to UTRANCS/PS Steering.

8.7.1 When to Use E-UTRAN to UTRAN CS/PS SteeringUse this feature when the following conditions are met:

l TDLOFD-001033 CS Fallback to UTRAN and TDLOFD-001019 PS Inter-RATMobility between E-UTRAN and UTRAN have been enabled.

l The operator owns multiple UTRAN frequencies and wants to divert CS or PS servicesto specific UTRAN frequencies based on the network plan and loads.



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8.7.2 Required Information1. Collect information about whether TDLOFD-001033 CS Fallback to UTRAN and

TDLOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN have beenactivated.

2. Collect the following information about the UEs that support UMTS and LTE on the livenetwork: Supported frequency bands Whether the UEs support redirection from E-UTRAN to UTRAN Whether the UEs support PS handover from E-UTRAN to UTRANWhether the UEs support UTRAN measurements This information is used to configureneighboring UTRAN cells and to determine whether to perform CSFB based onhandover or redirection. For details, see Inter-RAT Mobility Management in ConnectedMode.

3. Collect the operating frequencies and frequency policies of the E-UTRAN and UTRAN.The frequency policies for UTRAN and E-UTRAN must be the same. For example, if F1is the preferred frequency for voice services on UTRAN, the same configuration isrecommended for E-UTRAN.

4. Collect the configurations and versions of E-UTRAN and UTRAN equipment to checkwhether CSFB is supported.

8.7.3 Requirements




License


Table 8-25 License information for E-UTRAN to UTRAN CS/PS Steering


Model LicenseControl Item

NE Sales Unit

TDLOFD-001078

E-UTRAN toUTRANCS/PSSteering

LT1SEUCSPS01

E-UTRAN toUTRAN CS/PSSteering

eNodeB

per RRCConnected User

NOTE

This feature requires LOFD-001019 PS Inter-RAT Mobility between E-UTRAN and UTRAN orLOFD-001033 CS Fallback to UTRAN.




126







Required DataThe required data is the same as that for LOFD-001033 CS Fallback to UTRAN. For details,see 8.1.5.1 Data Preparation.

Scenario-specific DataThe following table describes the parameter that must be set in the CellAlgoSwitch MO toenable E-UTRAN to UTRAN CS/PS Steering.



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Parameter Name Parameter ID Data Source Setting Notes

Frequency LayerSwitch

CellAlgoSwitch.FreqLayerSwitch


When CSFB toUTRAN and PSinter-RAT mobilitybetween E-UTRANand UTRAN havebeen configured, setthis parameter asfollows:l Select the

UtranFreqLayerMeasSwitch(UtranFreqLayerMeasSwitch)option to enablemeasurement-based handoverfor E-UTRAN toUTRAN CS/PSSteering.

l Select theUtranFreqLayerBlindSwitch(UtranFreqLayerBlindSwitch)option to enableblind handoverfor E-UTRAN toUTRAN CS/PSSteering.

The following table describes the parameter that must be set in the UtranNFreq MO to setthe CS service priority for a UTRAN frequency.

Parameter Name


CSservicepriority

UtranNFreq.CsPriority


Set this parameter based on thenetwork plan. This parameterspecifies the CS service priorityfor the UTRAN frequency.




128


Using MML CommandsThe prerequisite is that CSFB to UTRAN has been activated.

l Scenario 1: Blind E-UTRAN to UTRAN CS/PS steering

Step 1 Run the MOD CELLALGOSWITCH command with theUtranFreqLayerBlindSwitch(UtranFreqLayerBlindSwitch) option of the FrequencyLayer Switch parameter selected.

NOTE

This function is also controlled by the UtranFreqLayerBlindSwitch option of theENodeBAlgoSwitch.FreqLayerSwtich parameter.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that theeNodeB-level parameter be turned off and the cell-level parameter be used.

Step 2 Run the MOD UTRANNFREQ command with the CS service priority parameter set toPriority_16(Priority 16).

----End

l Scenario 2: Measurement-based E-UTRAN to UTRAN CS/PS steering

Step 1 Run the MOD CELLALGOSWITCH command with theUtranFreqLayerMeasSwitch(UtranFreqLayerMeasSwitch) option of the FrequencyLayer Switch parameter selected.

NOTE

This function is also controlled by the UtranFreqLayerMeasSwitch option of theENodeBAlgoSwitch.FreqLayerSwtich parameter.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will not be used in later versions. Therefore, it is recommended that theeNodeB-level parameter be turned off and the cell-level parameter be used.

Step 2 Run the MOD UTRANNFREQ command with the CS service priority parameter set toPriority_16(Priority 16).

----End

MML Command Examplesl Scenario 1: Blind E-UTRAN to UTRAN CS/PS steeringMOD CELLALGOSWITCH: LocalCellId=0,FreqLayerSwitch=UtranFreqLayerBlindSwitch-1;MOD UTRANNFREQ: LocalCellId=0,UtranDlArfcn=10800,CsPriority=Priority_16;l Scenario 2: Measurement-based E-UTRAN to UTRAN CS/PS steeringMMOD CELLALGOSWITCH: LocalCellId=0,FreqLayerSwitch=UtranFreqLayerMeasSwitch-1;MOD UTRANNFREQ: LocalCellId=0,UtranDlArfcn=10800,CsPriority=Priority_16;

8.7.6 Activation ObservationThe signaling procedure is the same as that for CSFB to UTRAN. After E-UTRAN toUTRAN CS/PS Steering is used, check whether it works as expected.



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The activation observation procedure for E-UTRAN to UTRAN CS/PS Steering is as follows:

1. Verify that the UE supports CSFB and multiple UTRAN frequencies are available.2. Enable measurement-based and blind handover for E-UTRAN to UTRAN CS/PS

Steering. Set the highest PS service priority for UTRAN frequency F1 and the highestCS service priority for UTRAN frequency F2.

3. Have the UE camp on an LTE cell and initiate a voice call in the cell. The expected resultis that the UE falls back to a UTRAN cell on F2.

4. Have the UE camp on the LTE cell and initiate PS services. Move the UE to the LTE celledge. The expected result is that the UE is handed over to a UTRAN cell on F1.


Table 8-26 Parameters for E-UTRAN to UTRAN CS/PS Steering


CellAlgoSwitch FreqLayerSwitch Clear the following options:l UtranFreqLayerMeasSwitchl UtranFreqLayerBlindSwitch





Using MML Commandsl Deactivating blind E-UTRAN to UTRAN CS/PS steering

Run the MOD CELLALGOSWITCH command with theUtranFreqLayerBlindSwitch(UtranFreqLayerBlindSwitch) option of the FrequencyLayer Switch parameter cleared.

l Deactivating measurement-based E-UTRAN to UTRAN CS/PS steeringRun the MOD CELLALGOSWITCH command with theUtranFreqLayerMeasSwitch(UtranFreqLayerMeasSwitch) option of the FrequencyLayer Switch parameter cleared.

MML Command Examplesl Deactivating blind E-UTRAN to UTRAN CS/PS steeringMOD CELLALGOSWITCH: LocalCellId=0,FreqLayerSwitch=UtranFreqLayerBlindSwitch-0;

l Deactivating measurement-based E-UTRAN to UTRAN CS/PS steeringMOD CELLALGOSWITCH: LocalCellId=0,FreqLayerSwitch=UtranFreqLayerMeasSwitch-0;



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8.7.8 Performance MonitoringThe performance monitoring procedure for this feature is the same as that for CSFB toUTRAN. For details, see 8.1.8 Performance Monitoring. You can observe deliveredfrequencies based on network logs.


8.8 TDLOFD-001034 CS Fallback to GERANThis section provides engineering guidelines for TDLOFD-001034 CS Fallback to GERAN.

8.8.1 When to Use CS Fallback to GERANUse this feature in the initial phase of LTE network deployment when the followingconditions are met:

l The operator owns a mature GERAN network.l The LTE network does not provide VoLTE services, or UEs in the LTE network do not

support VoLTE services.

For policies on whether to use PS handover or PS redirection for CSFB, see Inter-RATMobility Management in Connected Mode. If GERAN and E-UTRAN cells cover the samearea, or the GERAN cell provides better coverage than the E-UTRAN cell, use CSFB basedon blind handover to decrease the CSFB delay.

8.8.2 Required Informationl Collect the operating frequencies, coverage areas, and configurations of the E-UTRAN

and GERAN cells. Information about coverage areas includes engineering parameters ofsites (such as latitude and longitude), TX power of cell reference signals, and neighborrelationship configurations.

l Collect the versions and configurations of the NEs in the E-UTRAN, GERAN, and corenetworks, and ensure that they all support CSFB. Table 8-27 describes the requirementsof CSFB to GERAN for the core networks.



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Table 8-27 Requirements of CSFB to GERAN for core networks

NE Requirement

MME Supports:l SGs interface to the MSCl LAI selection based on the TAI of the

serving celll MSC-initiated pagingl PLMN selection and reselectionl Combined EPS/IMSI attach,

combined EPS/IMSI detach, andcombined TAU/LAU

l Routing of CS signaling messagesl SMS over SGs

MSC Supports:l Combined EPS/IMSI attachl SMS over SGsl Paging message forwarding over the

SGs interface

SGSN Does not activate ISR during thecombined RAU/LAU procedure initiatedby the UE.

l Collect the following information about the UEs that support GSM and LTE on the live

network:– Supported frequency bands– Whether the UEs support redirection from E-UTRAN to GERAN– Whether the UEs support PS handover from E-UTRAN to GERAN– Whether the UEs support GERAN measurements

This information is used to configure neighboring GERAN cells and to determinewhether to perform CSFB based on handover or redirection. For details, see Inter-RAT Mobility Management in Connected Mode.

8.8.3 Requirements




License




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Table 8-28 License information for CSFB to GERAN

FeatureID

Feature Name Model LicenseControlItem

NE Sales Unit

TDLOFD-001034

CS Fallback toGERAN

LT1ST0CFBG00

CS Fallbackto GERAN

eNodeB per RRCConnected User

NOTE

If the GERAN network uses Huawei equipment, activate the license for GBFD-511313 CSFB and turnon the switch specified by the GCELLSOFT.SUPPORTCSFB parameter. This licence is used forscenarios with LAU after CSFB to GERAN.








Required DataBefore configuring CSFB to GERAN, collect the data related to neighbor relationships withGERAN cells. This section provides only the information about MOs related to neighboringGERAN cells. For more information about how to collect data for the parameters in theseMOs, see Inter-RAT Mobility Management in Connected Mode.

1. GeranNfreqGroup: used to configure a group of neighboring GERAN frequencies.2. GeranNfreqGroupArfcn: used to configure a neighboring BCCH frequency in a

GERAN carrier frequency group.3. GeranExternalCell: used to configure external GERAN cells. The

GeranExternalCell.Rac parameter must be set.4. GeranExternalCellPlmn: used to configure additional PLMN IDs for each shared

external GERAN cell. This MO is required only if the BTS that serves the externalGERAN cell works in RAN sharing with common carriers mode and multiple operatorsshare the external GERAN cell.



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5. GeranNcell: used to configure the neighbor relationship with a GERAN cell. If aneighboring GERAN cell supports blind handovers according to the network plan, theblind-handover priority of the cell must be specified by the GeranNcell.BlindHoPriorityparameter.

Scenario-specific DataThe following table describes the parameters that must be set in the ENodeBAlgoSwitch andCellAlgoSwitch MOs to set the handover mode and handover algorithm switches for CSFBto GERAN.

Parameter Name

ParameterID

DataSource

Setting Notes

HandoverModeswitch



Set this parameter based on the network plan.To activate PS handovers, select theGeranPsHoSwitch(GeranPsHoSwitch) option.To activate CCO, select theGeranCcoSwitch(GeranCcoSwitch) option.To activate NACC, select theGeranNaccSwitch(GeranNaccSwitch) option.If none of the preceding options is selected,redirection will be used for CSFB to GERAN.




To activate CSFB to GERAN, select theGeranCsfbSwitch(GeranCsfbSwitch) option.


Parameter Name

Parameter ID

DataSource

Setting Notes

Handover Modeswitch




Handover Modeswitch






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The following table describes the parameters that must be set in the CellAlgoSwitch andCSFallBackHo MOs to set the switch for adaptive blind handover for CSFB and the A1threshold for adaptive blind handover for CSFB.

Parameter Name

Parameter ID

DataSource

Setting Notes




When GSM and LTE cells are co-sited with thesame coverage, you can enableCsfbAdaptiveBlindHoSwitch. The eNodeB selectsa measurement or blind handover to GSM based onthe event A1 report submitted by a UE.

CSFBAdaptiveBlind HoA1 RSRPTriggerThreshold

CSFallBackHo.BlindHoA1ThdRsrp


This parameter specifies the RSRP threshold of theserving cell above which a CSFB-triggered adaptiveblind handover is triggered. If the RSRP valuemeasured by a UE exceeds this threshold, the UEsubmits a event A1 report. If the eNodeB receivesan event A1 report, it directly enters the blindhandling procedure. If the eNodeB does not receivean event A1 report (the UE is located at the edge ofthe E-UTRAN cell), it enters the measurementprocedure. The target measurement RAT depends onconfigured RAT priorities and UE capabilities.On the live network, set this parameter based onnetwork coverage.


Parameter Name

ParameterID

DataSource

Setting Notes

CNOperatorID



Set this parameter based on the network plan.This parameter specifies the ID of the operatorwhose RAT blind-handover priorities are to beset.




Set this parameter based on the network plan.This parameter is set to UTRAN by default andspecifies the highest-priority RAT to beconsidered in blind handovers for CSFB. ForCSFB to GERAN, set this parameter toGERAN.



135

Parameter Name

ParameterID

DataSource

Setting Notes




Set this parameter based on the network plan.This parameter is set to GERAN by default andspecifies the second-highest-priority RAT to beconsidered in blind handovers for CSFB. If thehighest-priority RAT has been set to GERAN,the second-highest-priority RAT cannot be setto GERAN. Ensure that this parameter is set toa different value from the CSFallBackBlind-HoCfg.InterRatHighestPri andCSFallBackBlindHoCfg.InterRatLowestPriparameters.




Set this parameter based on the network plan.This parameter is set to CDMA2000 by defaultand specifies the lowest-priority RAT to beconsidered in blind handovers for CSFB.Ensure that this parameter is set to a differentvalue from the CSFallBackBlind-HoCfg.InterRatHighestPri andCSFallBackBlindHoCfg.InterRatSecondPriparameters.

GERANLCScapability

CSFallBackBlindHoCfg.GeranLcsCap


Set this parameter based on the network plan.This parameter specifies the LCS capability ofthe GERAN.

The following table describes the parameters that must be set in the CellOpHoCfg MO to setcell-level blind-handover priorities of different RATs for CSFB.

ParameterName

ParameterID

DataSource

Setting Notes

CNOperator ID






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ParameterName

ParameterID

DataSource

Setting Notes

Localcell ID



Set this parameter based on the network plan. Thisparameter identifies the cell whose RAT blind-handover priorities are to be set.








Set this parameter based on the network plan. Thisparameter is set to GERAN by default and specifiesthe second-highest-priority RAT to be considered inblind handovers for CSFB. Ensure that this parameteris set to a different value from theCellOpHoCfg.InterRatHighestPri andCellOpHoCfg.InterRatLowestPri parameters.




Set this parameter based on the network plan. Thisparameter is set to CDMA2000 by default andspecifies the lowest-priority RAT to be considered inblind handovers for CSFB. Ensure that this parameteris set to a different value from theCellOpHoCfg.InterRatHighestPri andCellOpHoCfg.InterRatSecondPri parameters.

The following table describes the parameter that must be set in the CSFallBackHo MO to setthe CSFB protection timer.



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Parameter Name

ParameterID


CSFBProtectionTimer

CSFallBackHo.CsfbProtectionTimer


Set this parameter based on the networkplan. The default value 4 applies to aGSM+UMTS+LTE network. The defaultvalue is also recommended for a GSM+LTE network. If this parameter is settoo large, the CSFB delay increases inabnormal CSFB scenarios. If thisparameter is set too small, normalmeasurement or handover proceduresmay be interrupted.

The following table describes the parameter that must be set in the GlobalProcSwitch MO tocontrol redirection-based CSFB optimization for UEs in idle mode.

ParameterName


Setting Notes

ProtocolMessageOptimizationSwitch

GlobalProcSwitch.ProtocolMsgOptSwitch


To shorten the CSFB delay by skipping an RRCconnection reconfiguration procedure duringblind redirection for CSFB, select theIdleCsfbRedirectOptSwitch option of thisparameter.

The following table describes the parameter that must be set in the GlobalProcSwitch MO toset the policy for handling the conflicts between handover and CSFB procedures.

Parameter Name


HandoverProcessControlSwitch

GlobalProcSwitch.HoProcCtrlSwitch


It is recommended that thisparameter be set when handoverand CSFB procedures conflict,increasing the number of CSFBpreparation failures. The numberof CSFB preparation failuresbecause of procedure conflicts isobtained fromL.CSFB.PrepFail.Conflict.



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The following table describes the parameter that must be set in the CellAlgoSwitch MO toenable the function of deleting inter-frequency measurements when CSFB starts GERANmeasurement.

Parameter Name

Parameter ID


MeasurementOptimizationAlgorithmSwitch

CellAlgoSwitch.MeasOptAlgoSwitch


Select theCSFB_MEAS_DEL_INTERFREQ_SWoption if you need to enable the function ofdeleting inter-frequency measurements whenCSFB starts GERAN measurement. If thisoption is cleared, the eNodeB does not deleteinter-frequency measurements when CSFBstarts GERAN measurement.

8.8.5.2 Using the CMEl Fast Batch Activation

This feature can be batch activated using the Feature Operation and Maintenancefunction of the CME. For detailed operations, see the following section in the CMEproduct documentation or online help: CME Management > CME Guidelines >Enhanced Feature Management > Feature Operation and Maintenance.

l Single/Batch ConfigurationThis feature can be activated for a single eNodeB or a batch of eNodeBs on the CME.For detailed operations, see CME-based Feature Configuration.


Using MML Commandsl Basic scenario 1: CSFB to GERAN using blind redirection

CSFB to GERAN using blind redirection works regardless of whether neighboring GERANcells are configured.l If you want to configure a neighboring GERAN cell, you must configure the

GeranNFreq and GeranNCell MOs. For details about parameter settings, see Inter-RATMobility Management in Connected Mode.

l If you do not want to configure a neighboring GERAN cell, you must configure theGeranRanShare or GeranExternalCell MO. For details about parameter settings, seeInter-RAT Mobility Management in Connected Mode.

Step 1 Run the following eNodeB- and cell-level commands to enable the blind handover functionfor CSFB to GERAN:





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Step 2 Run the MOD CELLALGOSWITCH command with theGeranCsfbSwitch(GeranCsfbSwitch) option of the Handover Allowed Switch parameterselected.

NOTE

This function is also controlled by the GeranCsfbSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to usethe cell-level parameter.


Step 4 (Optional) If you require GERAN to have the highest priority for CSFB, run the followingeNodeB- and cell-level commands:

1. Run the MOD CSFALLBACKBLINDHOCFG command with the Highest priorityInterRat and Second priority InterRat parameters set to GERAN and UTRAN,respectively.

2. Run the MOD CELLOPHOCFG command with the Highest priority InterRat andSecond priority InterRat parameters set to GERAN and UTRAN, respectively.

Step 5 (Optional) If a neighboring GERAN cell is configured, run the MOD GERANNCELLcommand with the Blind handover priority parameter set to the highest priority (32).

Step 6 (Optional) If no neighboring GERAN cell is configured, run the ADD GeranNfreqGroupcommand with the Frequency Priority for Connected Mode parameter set to the highestpriority (8).

Step 7 (Optional) Run the MOD GLOBALPROCSWITCH command with theIdleCsfbRedirectOptSwitch option of the Protocol Message Optimization Switchparameter selected.

----End

l Basic scenario 2: CSFB to GERAN using blind CCO with NACC

Step 1 Add neighboring GERAN frequencies and neighbor relationships with GERAN cells. Fordetails about parameter settings, see Inter-RAT Mobility Management in Connected Mode.


NOTE


Step 3 Run the MOD ENODEBALGOSWITCH command with theBlindHoSwitch(BlindHoSwitch), GeranNaccSwitch(GeranNaccSwitch), andGeranCcoSwitch(GeranCcoSwitch) options of the Handover Mode switch parameter, and



140

the GERAN_RIM_SWITCH(GERAN RIM Switch) option of the RIM switch parameterselected.

Step 4 Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of theHandover Mode switch parameter selected.

Step 5 Run the MOD CSFALLBACKPOLICYCFG command with the PS_HO and CCO_HOoptions of the CSFB handover policy Configuration parameter cleared and selected,respectively.

Step 6 (Optional) If you require GERAN to have the highest priority for CSFB, run the MODCSFALLBACKBLINDHOCFG command with the Highest priority InterRat parameterset to GERAN and the Second priority InterRat parameter set to UTRAN.

Step 7 Run the MOD GERANNCELL command with the Blind handover priority parameter setto 32.

----End

l Basic scenario 3: CSFB to GERAN using blind handovers



NOTE


Step 3 Run the MOD ENODEBALGOSWITCH command with theBlindHoSwitch(BlindHoSwitch) and GeranPsHoSwitch(GeranPsHoSwitch) options ofthe Handover Mode switch parameter selected.

Step 4 Run the MOD CELLHOPARACFG command with the BlindHoSwitch option of theHandover Mode switch parameter selected.

Step 5 (Optional) If the optional feature TDLOFD-001089 CS Fallback Steering to GERAN isenabled, run the MOD CSFALLBACKPOLICYCFG command with the PS_HO option ofthe CSFB handover policy Configuration parameter selected.

Step 6 (Optional) If you require GERAN to have the highest priority for CSFB, run the MODCSFALLBACKBLINDHOCFG command with the Highest priority InterRat parameterset to GERAN and the Second priority InterRat parameter set to UTRAN.

Step 7 Run the MOD GERANNCELL command with the Blind handover priority parameter setto 32.

----End

l Basic scenario 4: CSFB to GERAN using measurement-based redirection




141


NOTE




Step 5 Run the MOD CELLALGOSWITCH command with theCSFB_MEAS_DEL_INTERFREQ_SW option of the Measurement OptimizationAlgorithm Switch parameter selected.

----End

l Basic scenario 5: CSFB to GERAN using measurement-based handovers(recommended)



NOTE


Step 3 Run the MOD ENODEBALGOSWITCH command with theGeranPsHoSwitch(GeranPsHoSwitch) option of the Handover Mode switch parameterselected.


Step 5 (Optional) If the optional feature TDLOFD-001089 CS Fallback Steering to GERAN isenabled, run the MOD CSFALLBACKPOLICYCFG command with the PS_HO option ofthe CSFB handover policy Configuration parameter selected.


----End



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l Basic scenario 6: CSFB to GERAN using measurement-based CCO with NACC(recommended)



NOTE


Step 3 Run the MOD ENODEBALGOSWITCH command with theGeranNaccSwitch(GeranNaccSwitch) and GeranCcoSwitch(GeranCcoSwitch) options ofthe Handover Mode switch parameter, and the GERAN_RIM_SWITCH(GERAN RIMSwitch) option of the RIM switch parameter selected.



Step 6 Run the MOD CSFALLBACKPOLICYCFG command with the PS_HO and CCO_HOoptions of the CSFB handover policy Configuration parameter cleared and selected,respectively.


----End



Step 1 Run the MOD GLOBALPROCSWITCH command with the CsfbFlowFirstSwitch optionof the Handover Process Control Switch parameter selected.

----End

MML Command Examplesl Basic scenario 1: CSFB to GERAN using blind redirection (configured with neighboring

GERAN cells)MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1;MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1;MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0,



143

InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN;ADD CELLOPHOCFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN;MOD GERANNCELL: LocalCellId=0, Mcc="460", Mnc="20", Lac=12, GeranCellId=15,BlindHoPriority=32;MOD GLOBALPROCSWITCH: ProtocolMsgOptSwitch=IdleCsfbRedirectOptSwitch-1;

l Basic scenario 1: CSFB to GERAN using blind redirection (configured with noneighboring GERAN cell)

MOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1;MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1;MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN;MOD CELLBLINDHOPARACFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN;ADD CELLOPHOCFG: LocalCellId=0, CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN;ADD GeranNfreqGroup: LocalCellId=0, BcchGroupId=0, StratingArfcn=0, ConnFreqPriority=8;ADD GERANNFREQGROUPARFCN: LocalCellId=0, BcchGroupId=0,GeranArfcn=0;MOD GLOBALPROCSWITCH: ProtocolMsgOptSwitch=IdleCsfbRedirectOptSwitch-1;

l Basic scenario 2: CSFB to GERAN using blind CCO with NACCMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1;MOD ENODEBALGOSWITCH: HoModeSwitch=BlindHoSwitch-1&GeranNaccSwitch-1&GeranCcoSwitch-1,RimSwitch=GERAN_RIM_SWITCH-1;MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-0;MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN;MOD GERANNCELL: LocalCellId=0, Mcc="460", Mnc="20", Lac=12, GeranCellId=15,BlindHoPriority=32;

l Basic scenario 3: CSFB to GERAN using blind handoversMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1;MOD ENODEBALGOSWITCH: HoModeSwitch=GeranPsHoSwitch-1&BlindHoSwitch-1;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-1;MOD CELLHOPARACFG: LocalCellId=0, HoModeSwitch=BlindHoSwitch-1;MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=GERAN,InterRatSecondPri=UTRAN;MOD GERANNCELL: LocalCellId=0, Mcc="460", Mnc="20", Lac=12, GeranCellId=15,BlindHoPriority=32;

l Basic scenario 4: CSFB to GERAN using measurement-based redirectionMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1;MOD CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;MOD CELLALGOSWITCH: MeasOptAlgoSwitch=CSFB_MEAS_DEL_INTERFREQ_SW-1;

l Basic scenario 5: CSFB to GERAN using measurement-based handoversMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1;MOD ENODEBALGOSWITCH: HoModeSwitch=GeranPsHoSwitch-1;MOD CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-1;MOD CELLALGOSWITCH: MeasOptAlgoSwitch=CSFB_MEAS_DEL_INTERFREQ_SW-1;

l Basic scenario 6: CSFB to GERAN using measurement-based CCO with NACCMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-1;MOD ENODEBALGOSWITCH: HoModeSwitch=GeranNaccSwitch-1&GeranCcoSwitch-1,RimSwitch=GERAN_RIM_SWITCH-1;MOD S1INTERFACE: S1InterfaceId=2,S1CpBearerId=1,CnOperatorId=0,MmeRelease=Release_R9;MOD CELLHOPARACFG: LocalCellId=1, HoModeSwitch=BlindHoSwitch-0;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-1&PS_HO-0;MOD CELLALGOSWITCH: MeasOptAlgoSwitch=CSFB_MEAS_DEL_INTERFREQ_SW-1;



144



MOD GLOBALPROCSWITCH:HoProcCtrlSwitch= CsfbFlowFirstSwitch-1;


Signaling ObservationThe activation observation procedure is as follows:

1. Enable a UE to camp on an E-UTRAN cell and make a voice call.2. Enable the UE to camp on an E-UTRAN cell and receive a voice call.

You can observe the signaling procedures for CSFB to GERAN, which is similar to that forCSFB to UTRAN described in section Figure 8-9.

NOTE

In the following figures, the UE on the left side and the UE on the right side are the same UE. Thesignaling on the GERAN side is for reference only. The procedure for mobile-terminated calls is similarto the procedure for mobile-originated calls except that the procedure for mobile-terminated callsincludes paging.



145

Figure 8-9 Redirection-based CSFB to GERAN for a mobile-originated call

The signaling procedure for PS handover-based CSFB to GERAN is different from thesignaling procedure for redirection-based CSFB to GERAN. The difference is as follows: InPS handover-based CSFB to GERAN, the eNodeB performs a PS handover procedure ratherthan an RRC connection release procedure after the UE reports measurement results to theeNodeB. For details about the signaling procedure of PS handover-based CSFB to GERAN,see 8.1.6 Activation Observation. In the signaling procedure of PS handover-based CSFB toGERAN, the CSFB indication flag is true and the CSFB target is GERAN in theMobilityFromEUTRACommand message.

In the signaling procedure for PS handover-based CSFB to GERAN, the cs-FallbackIndicatorIE is TRUE and the CSFB target is GERAN in the MobilityFromEUTRACommand message.Figure 8-10 shows the signaling procedure for CCO/NACC-based CFSB to GERAN for amobile-originated call. In the CSFB, handover preparation is absent. TheMobilityFromEUTRACommand message carries the CCO/NACC information and the CSFBtarget is GERAN.



146

Figure 8-10 CCO/NACC-based CSFB to GERAN for a mobile-originated call

Counter ObservationTable 8-29 lists the performance counters for observing functions related to CSFB toGERAN.

Table 8-29 Performance counters for observing CSFB to GERAN

Function CounterID


CSFB toGERAN

1526728324

L.CSFB.E2G Number of times CSFB toGERAN is performed



147

Function CounterID


CSFB toGERANtriggered foremergency calls

1526728710

L.CSFB.E2G.Emergency

Number of times CSFB toGERAN is triggered foremergency calls


Table 8-30 Parameters for deactivating CSFB to GERAN


CellAlgoSwitch HoAllowedSwitch To deactivate CSFB to GERAN, setGeranCsfbSwitch of theHoAlgoSwitch parameter to 0.



Using MML CommandsRun the MOD CELLALGOSWITCH command with theGeranCsfbSwitch(GeranCsfbSwitch) option of the Handover Algo switch parametercleared.

MML Command ExamplesMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSwitch-0;

8.8.8 Performance MonitoringCSFB is an end-to-end service. The performance counters on the LTE side can only indicatethe success rate of the CSFB procedure on the LTE side, and. they cannot indicate the successrate of the CSFB procedure on the target side. Therefore, the performance counters on theLTE side cannot directly show user experience of the CSFB procedure. It is recommendedthat you perform drive tests and use the performance counters on the UE side to indicate theactual user experience of the CSFB procedure.

Related counters are listed in Table 8-31.



148

Table 8-31 Counters related to the execution of CSFB by the eNodeB


1526728321 L.CSFB.PrepAtt Number of CSFB indicators received bythe eNodeB

1526728322 L.CSFB.PrepSucc Number of successful CSFB responsesfrom the eNodeB

Table 8-32 lists the counter related to CSFB to GERAN.

Table 8-32 Counter related to CSFB to GERAN


1526728324 L.CSFB.E2G Number of procedures for CSFB to GERAN

Table 8-33 lists the counters that indicate whether CSFB is performed through redirection orhandover.

Table 8-33 Counters related to CSFB through redirection or handover


1526728498 L.RRCRedirection.E2G.CSFB

Number of CSFB-based redirections from E-UTRAN to GERAN

1526728507 L.IRATHO.E2G.CSFB.PrepAttOut

Number of CSFB-based inter-RAT handoverpreparation attempts from E-UTRAN toGERAN

You can check whether CCO with NACC or CCO without NACC is used as the CSFBmechanism by viewing the counters listed in Table 8-34.

Table 8-34 Counters related to using CCO with NACC or CCO without NACC


1526729505 L.CCOwithNACC.E2G.CSFB.ExecAttOut

Number of CSFB-based CCO with NACCexecutions from E-UTRAN to GERAN

1526729506 L.CCOwithNACC.E2G.CSFB.ExecSuccOut

Number of successful CSFB-based CCOswith NACC from E-UTRAN to GERAN



149


1526729507 L.CCOwithoutNACC.E2G.CSFB.ExecAttOut

Number of CSFB-based CCO withoutNACC executions from E-UTRAN toGERAN

The CCO success rate can be calculated in the following ways:

l L.CCOwithNACC.E2G.CSFB.ExecSuccOut/L.CCOwithNACC.E2G.CSFB.ExecAttOut

l L.CCOwithoutNACC.E2G.CSFB.ExecSuccOut/L.CCOwithoutNACC.E2G.CSFB.ExecAttOut

After the CSFB protection timer expires, the eNodeB may perform a blind redirection to enterthe protection procedure. Table 8-35 lists the related counter. A larger value of this counterindicates a longer average UE access delay during CSFB.

Table 8-35 Counter related to the number of times that the eNodeB enters the protectionprocedure for CSFB


1526729516 L.RRCRedirection.E2G.CSFB.TimeOut

Number of CSFB-based blind redirectionsfrom E-UTRAN to GERAN caused byCSFB protection timer expiration

Table 8-36 lists the counters related to CSFB for emergency calls.

Table 8-36 Counters related to CSFB for emergency calls


1526729513 L.IRATHO.E2G.CSFB.ExecAttOut.Emergency

Number of CSFB-based handover executionattempts to GERAN triggered for emergencycalls

1526729514 L.IRATHO.E2G.CSFB.ExecSuccOut.Emergency

Number of successful CSFB-based handoverexecutions to GERAN triggered foremergency calls

CSFB handover success rate for emergency calls =L.IRATHO.E2G.CSFB.ExecSuccOut.Emergency/L.IRATHO.E2G.CSFB.ExecAttOut.Emergency

8.8.9 Parameter OptimizationThe blind-handover-related parameter optimization procedure for CSFB to GERAN is thesame as that for CSFB to UTRAN. For details, see 8.1.9 Parameter Optimization.



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The following table lists event-B1-related parameters for CSFB to GERAN in theCSFallBackHo MO.

Parameter Name

ParameterID

DataSource

Setting Notes

Local cellID

CSFallBackHo.LocalCellId



CSFBGERANEventB1TriggerThreshold

CSFallBackHo.CsfbHoGeranB1Thd


Set this parameter based on the network plan. Thisparameter specifies the RSSI threshold for eventB1 in CSFB to GERAN. Event B1 is triggeredwhen the measured RSSI of a GERAN cellreaches the value of this parameter and all otherconditions are also met.

CSFBGeranEventB1Time ToTrig

CSFallBackHo.CsfbHoGeranTimeToTrig


Set this parameter based on the network plan. Thisparameter specifies the time-to-trigger for eventB1 in CSFB to GERAN. When CSFB to GERANis required, set this parameter, which is used byUEs as one of the conditions for triggering eventB1. When a UE detects that the signal quality in atleast one GERAN cell meets the enteringcondition, it does not immediately send ameasurement report to the eNodeB. Instead, theUE sends a measurement report only when thesignal quality has been meeting the enteringcondition throughout a period defined by thisparameter. This parameter helps decrease thenumber of occasionally triggered event reports,the average number of handovers, and the numberof incorrect handovers, preventing unnecessaryhandovers.

8.9 RIM Procedure from E-UTRAN to GERAN

8.9.1 When to Use RIM Procedure from E-UTRAN to GERANIt is recommended that the RIM procedure be performed through the Huawei-proprietaryeCoordinator when the following conditions are met:

l Both the eNodeB and the RNC/BSC are provided by Huawei and are connected to thesame eCoordinator.

l The core network that the eNodeB and the RNC/BSC are connected to does not supportthe RIM procedure or is not enabled with the RIM procedure.

To perform the RIM procedure through the eCoordinator, setENodeBAlgoSwitch.RimOnEcoSwitch to ON(On).



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In other conditions, it is recommended that the RIM procedure be performed through the corenetwork. In this case, set ENodeBAlgoSwitch.RimOnEcoSwitch to OFF(Off).

8.9.2 Required InformationCheck whether the BSC, MME, and SGSN support the RIM procedure, and whether aneCoordinator has been deployed.

8.9.3 Requirements


If the RIM procedure is performed through the core network, the core-network equipmentmust support this feature:

l For the Huawei EPC, the EPC version for eRAN3.0 is required. If the EPC version is notfor eRAN3.0, messages may not be parsed.


l The BSC, MME, and SGSN must support the RIM procedures. If one of the NEs doesnot support, the RIM procedures fail.

NOTE

In a multioperator core network (MOCN) scenario, the eNodeB preferentially selects the link forthe primary operator when sending an RIM request. If the RIM procedure fails, the eNodeB nolonger attempts to send the RIM request on other links.

If the RIM procedure is performed through the eCoordinator, the RNC/BSC, eNodeB, andeCoordinator must all be provided by Huawei and with the switch for supporting the RIMprocedures through eCoordinator turned on.

License


Table 8-37 License information for CSFB to GERAN

FeatureID

FeatureName


NE Sales Unit

TDLOFD-001034

CSFB toGERAN

LT1ST0CFBG00

CS Fallback toGERAN






152






Required DataThe required data is the same as that for TDLOFD-001033 CS Fallback to UTRAN. Fordetails, see 8.1.5.1 Data Preparation.

GeranExternalCell: used to configure external GERAN cells. The GeranExternalCell.Racparameter must be set.

Scenario-specific DataThe following table describes the parameter that must be set in the ENodeBAlgoSwitch MOto configure the RIM procedure.

ParameterName

ParameterID

DataSource

Setting Notes

Support RIMbyeCoordinatorSwitch

ENodeBAlgoSwitch.RimOnEcoSwitch


If ENodeBAlgoSwitch.RimOnEcoSwitchis set to OFF(Off), the RIM procedure isperformed through the core network.If ENodeBAlgoSwitch.RimOnEcoSwitchis set to ON(On), the RIM procedure isperformed through the eCoordinator.




Run the MOD ENODEBALGOSWITCH command with the Support RIM byeCoordinator Switch parameter set to OFF(Off).

l Performing the RIM procedure through the eCoordinatorRun the MOD ENODEBALGOSWITCH command with the Support RIM byeCoordinator Switch parameter set to ON(On).



153


MOD ENODEBALGOSWITCH: RimOnEcoSwitch=OFF;

l Performing the RIM procedure through the eCoordinatorMOD ENODEBALGOSWITCH: RimOnEcoSwitch=ON;


Counter Observation

No matter whether the RIM procedure is performed through the core network or theeCoordinator, performance counters listed in Table 8-38 can be used to observe whether theRIM procedure has taken effect.

Table 8-38 Counters related to the RIM procedure between E-UTRAN and GERAN


1526729661 L.RIM.SI.E2G.Req Number of times theeNodeB sends a systeminformation request to aGERAN

1526729662 L.RIM.SI.E2G.Resp Number of times theeNodeB receives a systeminformation response from aGERAN

1526729663 L.RIM.SI.E2G.Update Number of times theeNodeB receives a systeminformation update from aGERAN

Signaling Tracing Result Observation

If the RIM procedure is performed through the core network, trace signaling messages asfollows:

Step 1 Start an S1 interface tracing task on the eNodeB LMT.

Check whether the ENB DIRECT INFORMATION TRANSFER message containing theRAN-INFORMATION-REQUEST IE is sent over the S1 interface. If the message is sent, youcan infer that the eNodeB has sent the RIM request successfully.

Step 2 Start a Gb interface tracing task on the BSC LMT.

If after receiving the DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION-REQUEST IE, the BSC sends the DIRECT INFORMATION TRANSFERmessage containing the RAN-INFORMATION IE to the SGSN, you can infer that the BSCcan response to the RIM request normally.

Step 3 Change the state of the GSM cell.



154

If the BSC sends the DIRECT INFORMATION TRANSFER message containing the RAN-INFORMATION IE over the Gb interface, you can infer that the BSC can notify the eNodeBwith the cell state change through the RIM procedure.

----End

If the RIM procedure is performed through the eCoordinator, trace signaling messages asfollows:

Step 1 Start an Se interface tracing task on the eNodeB LMT.

Check whether the ENB DIRECT INFORMATION TRANSFER message containing theRAN-INFORMATION-REQUEST IE is sent over the Se interface. If the message is sent, youcan infer that the eNodeB has sent the RIM request successfully.

Step 2 Start an Sg interface tracing task on the BSC LMT.

If after receiving the ECO DIRECT INFORMATION TRANSFER message containing theRAN-INFORMATION-REQUEST IE, the BSC sends the BSC DIRECT INFORMATIONTRANSFER message containing the RAN-INFORMATION IE to the eCoordinator, you caninfer that the BSC can response to the RIM request normally.

Step 3 Change the state of the GSM cell.

If the BSC sends the BSC DIRECT INFORMATION TRANSFER message containing theRAN-INFORMATION IE over the Sg interface, you can infer that the BSC can notify theeNodeB with the cell state change through the RIM procedure.

----End


Table 8-39 Parameters for the RIM procedure


ENodeBAlgoSwitch RimOnEcoSwitch Set this parameter to OFF(Off).






Run the MOD ENODEBALGOSWITCH command with the Support RIM byeCoordinator Switch parameter set to ON(On).



155

l Performing the RIM procedure through the eCoordinatorRun the MOD ENODEBALGOSWITCH command with the Support RIM byeCoordinator Switch parameter set to OFF(Off).


MOD ENODEBALGOSWITCH: RimOnEcoSwitch=ON;

l Performing the RIM procedure through the eCoordinatorMOD ENODEBALGOSWITCH: RimOnEcoSwitch=OFF;

8.9.8 Performance MonitoringThe performance monitoring procedure for this feature is the same as that for CSFB toGERAN. For details, see 8.8.8 Performance Monitoring.

8.9.9 Parameter OptimizationThe parameter optimization procedure for this feature is the same as that for CSFB toGERAN. For details, see 8.8.9 Parameter Optimization.

8.10 TDLOFD-001053 Flash CSFB to GERANThis section provides engineering guidelines for TDLOFD-001053 Flash CSFB to GERAN.

8.10.1 When to Use Flash CS Fallback to GERANWhen TDLOFD-001034 CS Fallback to GERAN has been enabled, use TDLOFD-001053Flash CS Fallback to GERAN if all the following conditions are met:The E-UTRAN andGERAN support the RIM with SIB procedure.3GPP Release 9 UEs are used on the livenetwork.The core networks support the RIM procedure. For policies on whether to use PShandover or PS redirection for CSFB, see Inter-RAT Mobility Management in ConnectedMode. If GERAN and E-UTRAN cells cover the same area, or the GERAN cell providesbetter coverage than the E-UTRAN cell, use CSFB based on blind handover to decrease theCSFB delay.

8.10.2 Required Informationl Collect information about whether LOFD-001034 CS Fallback to GERAN has been

activated.l Collect the operating frequencies, coverage areas, and configurations of the E-UTRAN


l Collect the versions and configurations of the NEs in the E-UTRAN, GERAN, and corenetworks, and ensure that they all support CSFB and the RIM procedure. Table 8-40describes the requirements of flash CSFB to GERAN for the core networks. For detailsabout processing in Huawei GSM equipment, see Interoperability Between GSM andLTE in GBSS Feature Documentation.

l Collect the following information about the UEs that support GSM and LTE on the livenetwork:



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– Whether the UEs support redirection from E-UTRAN to GERAN

– Whether the UEs support PS handover from E-UTRAN to GERAN

– Whether the UEs support GERAN measurements

– Whether the UEs comply with 3GPP Release 9 specifications

l This information is used to configure neighboring GERAN cells and to determinewhether to perform CSFB based on handover or redirection. For details, see Inter-RATMobility Management in Connected Mode.

Table 8-40 Requirements of flash CSFB to GERAN for core networks

NE Requirement

MME Supports CSFB and RIM procedures

SGSN Supports CSFB and RIM procedures

8.10.3 Requirements




License


Table 8-41 License information for flash CSFB to GERAN



NE Sales Unit

TDLOFD-001053

Ultra-FlashCSFB toGERAN(TDD)

LT1SFCSFGE01

Flash CSFallback toGERAN


NOTE

If the GERAN uses Huawei devices, evolved network assisted cell change (eNACC) between E-UTRAN and GERAN for CSFB needs to be enabled on the GERAN. For detailed operations, seesection "eNACC from EUTRAN to GERAN" in Interoperability Between GSM and LTE FeatureParameter Description.



157









Required Data

Before configuring CSFB to GERAN, collect the data related to neighbor relationships withGERAN cells. This section provides only the information about MOs related to neighboringGERAN cells and key parameters in these MOs. For more information about how to collectdata for the parameters in these MOs, see Inter-RAT Mobility Management in ConnectedMode Feature Parameter Description.

1. GeranNfreqGroup: used to configure a group of neighboring GERAN frequencies.

2. GeranNfreqGroupArfcn: used to configure a neighboring BCCH frequency in aGERAN carrier frequency group.

3. GeranExternalCell: used to configure external GERAN cells. TheGeranExternalCell.Rac parameter must be set.

4. GeranExternalCellPlmn: used to configure additional PLMN IDs for each sharedexternal GERAN cell. This MO is required only if the BTS that serves the externalGERAN cell works in RAN sharing with common carriers mode and multiple operatorsshare the external GERAN cell.

5. GeranNcell: used to configure the neighbor relationship with a GERAN cell. If aneighboring GERAN cell supports blind handovers according to the network plan, theblind-handover priority of the cell must be specified by the GeranNcell.BlindHoPriorityparameter.


The following table describes the parameters that must be set in the ENodeBAlgoSwitch andCellAlgoSwitch MOs to set the handover mode and handover algorithm switches for flashCSFB to GERAN.



158

ParameterName

ParameterID

DataSource

Setting Notes

HandoverMode switch







To activate CSFB to GERAN, select theGeranCsfbSwitch(GeranCsfbSwitch) andGeranFlashCsfbSwitch(GeranFlashCsfbS-witch) options.

RIM switch ENodeBAlgoSwitch.RimSwitch


GERAN_RIM_SWITCH(GERAN RIMSwitch) of this parameter specifies whether toenable or disable the RIM procedure thatrequests event-driven multiple reports fromGERAN cells.If this switch is turned on, the eNodeB cansend RAN-INFORMATION-REQUEST/Multiple Report PDUs to GERAN cells torequest event-driven multiple reports.If this switch is turned off, the eNodeB cannotsend RAN-INFORMATION-REQUEST/Multiple Report PDUs to GERAN cells.If this switch is turned off andGeranFlashCsfbSwitch(GeranFlashCsfbS-witch) of ENodeBAlgoSwitch.HoAlgoSwitchis turned on, the eNodeB sends RAN-INFORMATION-REQUEST/Single ReportPDUs to GERAN cells to request singlereports.If the GERAN cells support RAN-INFORMATION-REQUEST/Multiple ReportPDUs, you are advised to select theGERAN_RIM_SWITCH(GERAN RIMSwitch) option.




159

Parameter Name

Parameter ID

DataSource

Setting Notes

Handover Modeswitch




Handover Modeswitch




The following table describes the parameter that must be set in the S1Interface MO to set thecompliance protocol release of the MME.

Parameter Name

ParameterID


MMERelease

S1Interface.MmeRelease


To activate RIM procedures in MultipleReport mode, set the parameter toRelease_R9(Release 9).


ParameterName


Setting Notes

CNOperator ID

CSFallBackBlind-HoCfg.CnOperatorId


Set this parameter based on thenetwork plan. This parameterspecifies the ID of the operatorwhose RAT blind-handover prioritiesare to be set.


CSFallBackBlind-HoCfg.InterRatHighestPri


Set this parameter based on thenetwork plan. This parameter is set toUTRAN by default and specifies thehighest-priority RAT to be consideredin blind handovers for CSFB. Forflash CSFB to GERAN, set thisparameter to GERAN.



160

ParameterName


Setting Notes


CSFallBackBlind-HoCfg.InterRatSecondPri


Set this parameter based on thenetwork plan. This parameter is set toGERAN by default and specifies thesecond-highest-priority RAT to beconsidered in blind handovers forCSFB. If the highest-priority RAThas been set to GERAN, the second-highest-priority RAT cannot be set toGERAN. Ensure that this parameteris set to a different value from theCSFallBackBlind-HoCfg.InterRatHighestPri andCSFallBackBlind-HoCfg.InterRatLowestPriparameters.


CSFallBackBlind-HoCfg.InterRatLowestPri


Set this parameter based on thenetwork plan. This parameter is set toCDMA2000 by default and specifiesthe lowest-priority RAT to beconsidered in blind handovers forCSFB. Ensure that this parameter isset to a different value from theCSFallBackBlind-HoCfg.InterRatHighestPri andCSFallBackBlind-HoCfg.InterRatSecondPriparameters.

GERANLCScapability

CSFallBackBlind-HoCfg.GeranLcsCap


Set this parameter based on thenetwork plan. This parameterspecifies the LCS capability of theGERAN.

The following table describes the parameter that must be set in the InterRatHoComm MO toset the maximum number of neighboring UTRAN cells whose system information is sent toUEs for flash redirections.



161

ParameterName

ParameterID

DataSource

Setting Notes

Max Geran cellnum inredirection

InterRatHoComm.CellInfoMaxGeranCellNum


Set this parameter based on the networkplan. The default value is 8. If thisparameter is set to a small value, the flashCSFB success rate decreases because UEsmay not receive valid neighboring cellsystem information. If this parameter is setto a large value, the size of an RRCconnection release message increases andCSFB may fail.

Max Geran cellnum in CSFBEMCredirection

InterRatHoComm.GeranCellNumForEmcRedirect


To use flash CSFB for emergency blindredirection, change the parameter valuefrom the default value 0 to a non-zerovalue.




Using MML Commands

The prerequisite is that CSFB to GERAN has been activated. In addition to the steps in theCSFB to GERAN using blind redirections or CSFB to GERAN using measurement-basedredirections scenario, perform the following steps:

Step 1 Run the MOD CELLALGOSWITCH command with theGeranFlashCsfbSwitch(GeranFlashCsfbSwitch) option of the Handover Allowed Switchparameter selected.

NOTE

In addition, this function is controlled by the GeranFlashCsfbSwitch option of theENodeBAlgoSwitch.HoAlgoSwitch parameter.



Step 2 Run the MOD ENODEBALGOSWITCH command with theGERAN_RIM_SWITCH(GERAN RIM Switch) option of the RIM switch parameterselected.


Step 4 (Optional) Run the MOD INTERRATHOCOMM command with the Max Geran cell numin redirection parameter set (its default value is 8).



162

Step 5 (Optional) Run the MOD INTERRATHOCOMM command with the Max Geran cell numin CSFB EMC redirection parameter set, for example, to 3.

----End

MML Command ExamplesMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranFlashCsfbSwitch-1;MOD ENODEBALGOSWITCH: RimSwitch=GERAN_RIM_SWITCH-1;MOD S1INTERFACE: S1InterfaceId=2,S1CpBearerId=1,CnOperatorId=0,MmeRelease=Release_R9;MOD INTERRATHOCOMM: CellInfoMaxGeranCellNum=8;MOD INTERRATHOCOMM: GeranCellNumForEmcRedirect=3;



Enable a UE to camp on an E-UTRAN cell and originate a voice call. If so that the UE fallsback to a GERAN cell and completes the call continues, and the RRC Connection Releasemessage traced in on the Uu interface tracing carries the information of the neighboringGERAN cell. In this case, flash CSFB to GERAN has been activated successfully.

In this case, flash CSFB to GERAN has been activated successfully. The procedure of flashCS fallback to GERAN on the E-UTRAN side is the same as the procedure of redirection-based CS fallback to GERAN. For details, see 8.1.6 Activation Observation. The differenceis that the RRC Connection Release message carries the system information of theneighboring GERAN cell. For details, see Figure 8-11.

Figure 8-11 The RRC Connection Release message during flash CSFB to GERAN



163


Check the status of the RIM procedure towards neighboring GERAN cells by running theDSP GERANRIMINFO command. If the ID of a neighboring GERAN cell is displayed inthe command output, the eNodeB has obtained the system information of this neighboringGERAN cell.

Counter Observation

The counter listed in Table 8-42 can be viewed to check whether the feature has taken effect.

Table 8-42 Performance counters for observing flash CSFB to GERAN

Functions Counter ID Counter Name Description

Flash CS Fallback toGERAN

1526728706 L.FlashCSFB.E2G Number ofprocedures for flashCSFB to GERAN

RIM during flashCSFB to GERAN

1526729661 L.RIM.SI.E2G.Req Number of times theeNodeB sends asystem informationrequest to a GERAN

1526729662 L.RIM.SI.E2G.Resp

Number of times theeNodeB receives asystem informationresponse from aGERAN

1526729663 L.RIM.SI.E2G.Update

Number of times theeNodeB receives asystem informationupdate from aGERAN


Table 8-43 Parameters for deactivating flash CSFB to GERAN


CellAlgoSwitch HoAllowedSwitch Set GeranFlashCsfbSwitch of theHoAlgoSwitch parameter to 0.




164




Using MML Commands

Run the MOD CELLALGOSWITCH command with the GeranFlashCsfbSwitch option ofthe Handover Allowed Switch parameter cleared.

MML Command ExamplesMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranFlashCsfbSwitch-0;



8.11 TDLOFD-081203 Ultra-Flash CSFB to GERANThis section provides engineering guidelines for TDLOFD-081203 Ultra-Flash CSFB toGERAN.

8.11.1 When to Use Ultra-Flash CSFB to GERANUse this feature in the overlapping coverage of GSM and LTE networks when the followingconditions are met:

l The TDLOFD-001034 CS Fallback to GERAN feature has been enabled.

l The eNodeB, MME, and MSC are provided by Huawei.

l A proportion of UEs support SRVCC from E-UTRAN to GERAN.

8.11.2 Required InformationBefore deploying this feature, ensure that:

l TD LOFD-001034 CS Fallback to GERAN has been enabled.

l The eNodeB, MME, and MSC are provided by Huawei and they all support this feature.

l There are UEs that support SRVCC from E-UTRAN to GERAN.



165

8.11.3 Requirements


This feature is a Huawei-proprietary feature and requires that the eNodeB, MME, and MSCbe provided by Huawei and support this feature. This feature is used with MME11.0 andMSC11.0.

License


Table 8-44 License information for ultra-flash CSFB to GERAN

FeatureID

Feature Name Model LicenseControlItem

NE Sales Unit

TDLOFD-081203

Ultra-Flash CSFBto GERAN

LT1SUFCFBG00

Ultra-FlashCSFB toGERAN


8.11.4 PrecautionsThis feature is a Huawei-proprietary feature and is not supported by devices provided by othervendors. In addition, this feature must first be activated on the BSC, MME, and MSC, andthen be activated on the eNodeB. This is because this feature is triggered by the eNodeB andthis avoids CSFB failures.








Required Data

The required data is the same as that for TDLOFD-001034 CS Fallback to GERAN. Fordetails, see 8.1.5.1 Data Preparation.



166

Scenario-specific DataThe following table describes the parameter that must be set in the ENodeBAlgoSwitch MOto set the eNodeB-level handover switch for ultra-flash CSFB to GERAN.

ParameterName

ParameterID

DataSource

Setting Notes

HandoverAlgo switch



Select the GeranUltraFlashCsfbS-witch(GeranUltraFlashCsfbSwitch) option.

The following table describes the parameter that must be set in the CellHoParaCfg MO to setthe cell-level blind handover switch for ultra-flash CSFB to GERAN.

Parameter Name

Parameter ID

DataSource

Setting Notes

Handover Modeswitch



To activate cell-level blind handovers, select theBlindHoSwitch(BlindHoSwitch) option. Toactivate blind handovers, you still need to activateeNodeB-level blind handovers.

The following table describes the parameter that must be set in the CellHoParaCfg MO todisable blind handover for UEs supporting ultra-flash CSFB after the blind handover functiontakes effect.

Parameter Name

Parameter ID


HandoverModeswitch



Select the UFCsfbBlindHoDisSwitch option ifyou want to disable blind handover and enablemeasurement-based handover for UEssupporting ultra-flash CSFB when the blindhandover function takes effect. If this option iscleared, the blind handover function for UEssupporting ultra-flash CSFB that takes effectstill persists.

The following table describes the parameter that must be set in the CellAlgoSwitch MO toenable the function of deleting inter-frequency measurements when CSFB starts GERANmeasurement.



167

Parameter Name

Parameter ID


MeasurementOptimizationAlgorithmSwitch

CellAlgoSwitch.MeasOptAlgoSwitch


Select theCSFB_MEAS_DEL_INTERFREQ_SWoption if you need to enable the function ofdeleting inter-frequency measurements whenCSFB starts GERAN measurement. If thisoption is cleared, the eNodeB does not deleteinter-frequency measurements when CSFBstarts GERAN measurement.

The following table describes the parameter that must be set in the GeranExternalCell MOto set the capability of external GERAN cells when some GERAN cells do not support ultra-flash CSFB to GERAN.

Parameter Name

Parameter ID

DataSource

Setting Notes

Ultra-FlashCSFBcapabilityindicator

GeranExternalCell.UltraFlashCsfbInd


Clear the UltraFlashCsfbInd option for externalGERAN cells that do not support ultra-flash CSFBto GERAN.

The following table describes the parameter that must be set in the CellDrxPara MO to setthe DRX switch for measurements when UEs support DRX-based measurements.

Parameter Name

Parameter ID

DataSource

Setting Notes

DRXswitchformeasurements

CellDrxPara.DrxForMeasSwitch


When the network supports measurements and UEssupport DRX measurements well, measurementdelays are significantly reduced and the customercan tolerate the impact on services duringmeasurements.To enable the DRX switch for measurements, setDrxForMeasSwitch to 1.

LongDRXCycle forMeasurement

CellDrxPara.LongDrxCycleForMeas


This parameter specifies the length of the long DRXcycle specific to GERAN measurement.



168

Parameter Name

Parameter ID

DataSource

Setting Notes

OnDurationTimer forMeasurement

CellDrxPara.OnDurTimerForMeas


This parameter specifies the length of the OnDuration Timer specific to GERAN measurement.

DRXInactivityTimer forMeasurement

CellDrxPara.DrxInactTimerForMeas


This parameter specifies the length of the DRXInactivity Timer specific to GERAN measurement.

DRXRetransmissionTimer forMeasurement

CellDrxPara.DrxReTxTimerForMeas


This parameter specifies the length of the DRXRetransmission Timer specific to GERANmeasurement.

ShortDRXSwitchforMeasurement

CellDrxPara.ShortDrxSwForMeas


This parameter specifies whether short-period DRXis enabled for GERAN measurements.

ShortDRXCycle forMeasurement

CellDrxPara.ShortDrxCycleForMeas


This parameter specifies the length of the shortDRX cycle specific to GERAN measurement.

ShortCycleTimer forMeasurement

CellDrxPara.ShortCycleTimerForMeas


This parameter specifies the length of the ShortCycle Timer specific to GERAN measurement.

The following table describes the parameter that must be set in the GlobalProcSwitch MO toturn on the UE compatibility switch when UEs do not support Ultra-Flash CSFB, resulting inUE compatibility problems.



169

Parameter Name

Parameter ID

DataSource

Setting Notes

UeCompatibilitySwitch

GlobalProcSwitch.UeCompatSwitch


Select the UltraFlashCsfbComOptSw option ofthe parameter when UEs on the network do notsupport ultra-flash CSFB.When the MME provided by Huawei allows IMEIwhitelist configurations for ultra-flash CSFB and theoption is selected, the eNodeB performs ultra-flashCSFB on UEs in the IMEI whitelist. Therefore,delete the UEs that do not support ultra-flash CSFBfrom the whitelist before selecting the option.Otherwise, keep the option unselected.



Using MML Commandsl Basic scenario

Step 1 Run MML commands to configure neighboring GERAN frequencies and GERAN cells. Fordetails about parameter settings, see Inter-RAT Mobility Management in Connected Mode.

Step 2 Run the MOD ENODEBALGOSWITCH command with theGeranUltraFlashCsfbSwitch(GeranUltraFlashCsfbSwitch) option of the Handover Algoswitch parameter selected.

Step 3 (Optional) Run the MOD GLOBALPROCSWITCH command with theIratMeasCfgTransSwitch option of the Protocol Message Optimization Switch parameterselected if you need to optimize "G2L Fast Return after Ultra-Flash CSFB to GERAN" basedon the E-UTRA frequency capability supported by UEs. The eNodeB transfers E-UTRAfrequency information supported by UEs to the BSC during SRVCC.

Step 4 (Optional) Run the MOD GERANEXTERNALCELL command with the Ultra-FlashCSFB Capability Indication parameter set to BOOLEAN_FALSE if some externalGERAN cells do not support Ultra-Flash CSFB to GERAN.

Step 5 (Optional) Run the MOD CELLDRXPARA command with the DRX for MeasurementSwitch parameter set to ON(On) if UEs support DRX-based measurements.

----End

l (Optional) Perform the following operation if UE compatibility risks exist after ultra-flash CSFB is activated.

Step 1 Run the MOD GLOBALPROCSWITCH command with theUltraFlashCsfbComOptSw(UltraFlashCsfbComOptSw) option of the UE CompatibilitySwitch parameter selected.

----End



170

l (Optional) Perform the following operation if you need to disable blind handover andenable measurement-based handover for UEs supporting ultra-flash CSFB after the blindhandover function takes effect.

Step 1 Run the MOD CELLHOPARACFG command with the UFCsfbBlindHoDisSwitch optionof the Handover Mode switch parameter selected.

----End

l (Optional) Perform the following operation if you need to enable the function of deletinginter-frequency measurements when CSFB starts GERAN measurement.

Step 1 Run the MOD CELLALGOSWITCH command with theCSFB_MEAS_DEL_INTERFREQ_SW option of the MeasOptAlgoSwitch parameterselected.

----End

MML Command Examplesl Basic scenario

MOD ENODEBALGOSWITCH: HoAlgoSwitch= GeranUltraFlashCsfbSwitch-1;MOD GlobalProcSwitch: ProtocolMsgOptSwitch=IratMeasCfgTransSwitch-1;MOD GERANEXTERNALCELL: Mcc="302", Mnc="220", GeranCellId=2, Lac=12, UltraFlashCsfbInd=BOOLEAN_TRUE;MOD CELLDRXPARA: LocalCellId=0, DrxForMeasSwitch=1, LongDrxCycleForMeas=SF160, OnDurTimerForMeas=PSF2, DrxInactTimerForMeas=PSF2, DrxReTxTimerForMeas=PSF4, ShortDrxSwForMeas=1, ShortDrxCycleForMeas=SF20, ShortCycleTimerForMeas=1;

l (Optional) Perform the following operation if UE compatibility risks exist after ultra-flash CSFB is activated.MOD GLOBALPROCSWITCH: UeCompatSwitch= UltraFlashCsfbComOptSw-1;

(Optional) Perform the following operation if you need to disable blind handover andenable measurement-based handover for UEs supporting ultra-flash CSFB after the blindhandover function takes effect.MOD CELLHOPARACFG: HoModeSwitch= UFCsfbBlindHoDisSwitch-1;

(Optional) Perform the following operation if you need to enable the function of deletinginter-frequency measurements when CSFB starts GERAN measurement.MOD CELLALGOSWITCH: MeasOptAlgoSwitch=CSFB_MEAS_DEL_INTERFREQ_SW-1;



To use signaling tracing to verify whether this feature has been activated, perform thefollowing steps:

1. As shown in the following figure, the HANDOVER REQUIRED message sent from theeNodeB to the MME over the S1 interface contains handover request cause values "cs-fallback-triggered" and "sRVCCHOIndication-cSonly (1)", indicating that an ultra-flashCSFB to GERAN is triggered successfully.

2. The UE falls back to a GERAN cell and completes the call.



171

Figure 8-12 HANDOVER REQUIRED message

Counter Observation

The counter listed in the following table can be monitored to check whether the feature hasbeen activated.

Table 8-45 Performance counters for ultra-flash CSFB to GERAN


1526733006 L.IRATHO.CSFB.SRVCC.E2G.PrepAttOut

Number of SRVCC-based outgoing handoverattempts from E-UTRAN to GERAN for ultra-flash CSFB to GERAN


Table 8-46 Parameter related to ultra-flash CSFB to GERAN


ENodeBAlgoSwitch HoAlgoSwitch To deactivate ultra-flash CSFB toGERAN, deselect theGeranUltraFlashCsfbSwitch option.




172




Using MML Commands

Run the MOD ENODEBALGOSWITCH command with theGeranUltraFlashCsfbSwitch(GeranUltraFlashCsfbSwitch) option of the Handover Algoswitch parameter deselected.

MML Command ExamplesMOD ENODEBALGOSWITCH: HoAlgoSwitch=GeranUltraFlashCsfbSwitch-0;

8.11.8 Performance MonitoringTable 8-47 lists the counters used to monitor the performance of ultra-flash CSFB toGERAN.

Table 8-47 Counters related to ultra-flash CSFB to GERAN



Number of SRVCC-based outgoinghandover attempts from E-UTRAN toGERAN for ultra-flash CSFB to GERAN

1526733007 L.IRATHO.CSFB.SRVCC.E2G.ExecAttOut

Number of SRVCC-based outgoinghandover executions from E-UTRAN toGERAN for ultra-flash CSFB to GERAN

1526733008 L.IRATHO.CSFB.SRVCC.E2G.ExecSuccOut

Number of successful SRVCC-basedoutgoing handovers from E-UTRAN toGERAN for ultra-flash CSFB to GERAN

1526733009 L.IRATHO.CSFB.SRVCC.E2G.MMEAbnormRsp

Number of abnormal responses from theMME during outgoing handovers from E-UTRAN to GERAN for ultra-flash CSFB toGERAN

Execution success rate of handovers for ultra-flash CSFB to GERAN =(L.IRATHO.CSFB.SRVCC.E2G.ExecSuccOut -L.IRATHO.CSFB.SRVCC.E2G.MMEAbnormRsp)/L.IRATHO.CSFB.SRVCC.E2G.ExecAttOut




173

8.12 TDLOFD-001069 CS Fallback with LAI to GERANThis section provides engineering guidelines for TDLOFD-001069 CS Fallback with LAI toGERAN.

8.12.1 When to Use CS Fallback with LAI to GERANUse TDLOFD-001069 CS Fallback with LAI to GERAN when both of the followingconditions are met:

l TDLOFD-001034 CS Fallback to GERAN has been enabled.l The E-UTRAN cell has neighboring GERAN cells that belong to different PLMNs and

supports inter-PLMN handovers, or the E-UTRAN cell has neighboring GERAN cellsthat have different LACs.

If both TDLOFD-001033 CS Fallback to UTRAN and TDLOFD-001034 CS Fallback toGERAN have been enabled, you are advised to enable both TDLOFD-001069 CS Fallbackwith LAI to GERAN and TDLOFD-001068 CS Fallback with LAI to UTRAN.

8.12.2 Required Informationl Collect information about whether TDTDLOFD-001034 CS Fallback to GERAN has

been activated.l Collect the operating frequencies, coverage areas, and configurations of the E-UTRAN


l Collect the versions and configurations of the NEs in the E-UTRAN, GERAN, and corenetworks, and ensure that they all support CSFB and the MME supports LAI delivery.Table 8-48 describes the requirements of CSFB with LAI to GERAN for the corenetworks.

Table 8-48 Requirements of CSFB with LAI to GERAN for core networks

NE Requirement

MME Supports:l SGs interface to the MSCl LAI selection based on the TAI of the

serving celll MSC-initiated pagingl PLMN selection and reselectionl Combined EPS/IMSI attach,

combined EPS/IMSI detach, andcombined TAU/LAU

l CS signaling message routingl SMS over SGsl LAI delivery



174

NE Requirement

MSC Supports:l Combined EPS/IMSI attachl SMS over SGsl Paging message forwarding over the

SGs interface

SGSN Does not activate ISR during thecombined RAU/LAU procedure initiatedby the UE.

l Collect the following information about the UEs that support GSM and LTE on the live

network:– Supported frequency bands– Whether the UEs support redirection from E-UTRAN to GERAN– Whether the UEs support PS handover from E-UTRAN to GERAN– Whether the UEs support GERAN measurements

This information is used to configure neighboring GERAN cells and to determinewhether to perform CSFB based on handover or redirection. For details, see Inter-RAT Mobility Management in Connected Mode.

8.12.3 Requirements




License


Table 8-49 License information for CSFB with LAI to GERAN

FeatureID

Feature Name Model

LicenseControl Item

NE Sales Unit

TDLOFD-001069

CS Fallback withLAI to GERAN

LT1SGCSLAI00

CS Fallbackwith LAI toGERAN

eNodeB

per RRCConnected User




175

8.12.5 Data Preparation and Feature ActivationThis feature is automatically activated when two conditions are met: The license for thisfeature has been purchased. CSFB to GERAN has been activated.


Data preparation for activating CSFB with LAI to GERAN is the same as that for activatingCSFB to GERAN. For details, see 8.1.5.1 Data Preparation.




For details, see 8.8.5.3 Using MML Commands.

8.12.6 Activation ObservationThe activation observation procedure is as follows:

1. Configure two neighboring GERAN cells with different LAIs for an E-UTRAN cell, andenable the MME to include only one of the two LAIs in the instructions that will bedelivered to the eNodeB.

2. Ensure that the signal strengths of the two GERAN cells both reach the threshold forevent B1. You can query the threshold by running the LSTINTERRATHOGERANGROUP command.

3. Enable a UE to camp on the E-UTRAN cell and make a voice call.

4. Enable the UE to camp on the E-UTRAN cell and receive a voice call.

You can observe the signaling procedure for CSFB with LAI to GERAN, which is similar tothat for CSFB to GERAN described in 8.9.6 Activation Observation. The difference is thatthe Initial Context Setup Request or UE Context Mod Request message carries the LAI thatthe MME delivers to the eNodeB, as shown in the following figure:

Figure 8-13 LAI signaling tracing



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8.12.7 DeactivationTDLOFD-001069 CS Fallback with LAI to GERAN is automatically deactivated when itslicense or CSFB to GERAN is deactivated. For details about how to deactivate CSFB toGERAN, see 8.8.7 Deactivation.



8.13 TDLOFD-001089 CS Fallback Steering to GERANThis section provides engineering guidelines for TDLOFD-001089 CS Fallback Steering toGERAN.

8.13.1 When to Use CS Fallback Steering to GERANUse this feature to improve the network efficiency when the following conditions are met:

l TDLOFD-001034 CS Fallback to GERAN has been enabled.l An operator owns multiple GERAN frequencies and the operator has different handover

policies for CS-only services and combined CS+PS services.

If the operator owns both UTRAN and GERAN, you can also activate TDLOFD-001088 CSFallback Steering to UTRAN to improve the network efficiency.

8.13.2 Required Information1. Collect information about whether TDLOFD-001034 CS Fallback to GERAN has been

activated.2. Collect the following information about the UEs that support GSM and LTE on the live

network:– Supported frequency bands– Whether the UEs support redirection from E-UTRAN to GERAN– Whether the UEs support PS handover from E-UTRAN to GERAN– Whether the UEs support CCO from E-UTRAN to GERAN– Whether the UEs support GERAN measurementsThis information is used to configure neighboring GERAN cells and to determinewhether to perform CSFB based on handover, redirection, or CCO. For details, see Inter-RAT Mobility Management in Connected Mode Feature Parameter Description.

3. Collect information about the frequencies and frequency policies of the GERAN.Frequency policies must be the same for GERAN and E-UTRAN.

4. If TDLOFD-001088 CS Fallback Steering to UTRAN is also to be activated, considerthe UTRAN frequencies when making frequency policies.



177

8.13.3 Requirements




License


Table 8-50 License information for CSFB steering to GERAN

Feature ID Feature Name Model LicenseControlItem

NE Sales Unit

TDLOFD-001089

CS FallbackSteering toGERAN

LT1STCSFSG00

CS FallbackSteering toGERAN

eNodeB










Required Data

The required data is the same as that for CS Fallback to GERAN. For details, see 8.1.5.1 DataPreparation.



178


The following table describes the parameter that must be set in the CellAlgoSwitch MO toenable Handover Allowed Switch.

Parameter Name

Parameter ID

DataSource

Setting Notes




Select the GeranCsfbSteeringS-witch(GeranCsfbSteeringSwitch) option underthis parameter.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfgMO to set RAT priorities for CSFB triggered for RRC_CONNECTED UEs.

ParameterName

ParameterID

DataSource

Setting Notes

CNOperator ID







Set this parameter based on the network plan. Thisparameter is set to UTRAN by default and specifiesthe highest-priority RAT to be considered in blindhandovers for CSFB.








Set this parameter based on the network plan. Thisparameter is set to CDMA2000 by default andspecifies the lowest-priority RAT to be considered inblind handovers for CSFB. Ensure that this parameteris set to a different value from the CSFallBackBlind-HoCfg.InterRatHighestPri and CSFallBackBlind-HoCfg.InterRatSecondPri parameters.



179

ParameterName

ParameterID

DataSource

Setting Notes

GERAN LCScapability

CSFallBackBlindHoCfg.GeranLcsCap


Set this parameter based on the network plan. Thisparameter specifies the LCS capability of theGERAN.

The following table describes the parameters that must be set in the CSFallBackBlindHoCfgMO to set RAT priorities for CSFB triggered for RRC_IDLE UEs.

ParameterName

ParameterID

DataSource

Setting Notes


CSFallBackBlindHoCfg.IdleCsfbHighestPri


Set this parameter based on the network plan. Thisparameter is set to UTRAN by default and specifiesthe highest-priority RAT to be considered in CSFB forUEs in idle mode.


CSFallBackBlindHoCfg.IdleCsfbSecondPri


Set this parameter based on the network plan. Thisparameter is set to GERAN by default and specifiesthe second-highest-priority RAT to be considered inCSFB for UEs in idle mode. Ensure that thisparameter is set to a different value from theCSFallBackBlindHoCfg.IdleCsfbHighestPri andCSFallBackBlindHoCfg.IdleCsfbLowestPriparameters.


CSFallBackBlindHoCfg.IdleCsfbLowestPri


Set this parameter based on the network plan. Thisparameter is set to CDMA2000 by default andspecifies the lowest-priority RAT to be considered inCSFB for UEs in idle mode. Ensure that thisparameter is set to a different value from theCSFallBackBlindHoCfg.IdleCsfbHighestPri andCSFallBackBlindHoCfg.IdleCsfbSecondPriparameters.

The following table describes the parameter that must be set in the CSFallBackPolicyCfgMO to set the CSFB policy for RRC_CONNECTED UEs.



180

ParameterName

ParameterID

DataSource

Setting Notes





The following table describes the parameter that must be set in the CSFallBackPolicyCfgMO to set the CSFB policy for RRC_IDLE UEs.

ParameterName

ParameterID

DataSource

Setting Notes

CSFBhandoverpolicyConfigurationfor idleue

CSFallBackPolicyCfg.IdleModeCsfbHoPolicyCfg





Using MML CommandsThe configuration is just an example, and configurations on the live network can differ fromthis example. For MML command settings in scenarios where the UTRAN and GERANcover the same area but only the GERAN provides contiguous coverage, see 8.6.5 DataPreparation and Feature Activation.

The prerequisite is that CSFB to GERAN has been activated.

Step 1 Run the MOD CELLALGOSWITCH command with the GeranCsfbSteeringSwitch optionof the Handover Allowed Switch parameter selected.



181

NOTE

This feature is also controlled by the GeranCsfbSteeringSwitch option of the eNodeB-level parameterENodeBAlgoSwitch.HoAlgoSwitch.The option of the cell-level parameter takes effect only when that option of the eNodeB-level parameteris cleared.The eNodeB-level parameter will no longer be used in later versions. Therefore, you are advised to usethe cell-level parameter.

Step 2 Run the MOD CSFALLBACKBLINDHOCFG command with the Highest priorityInterRat, Second priority InterRat, CSFB Highest priority InterRat for Idle UE, andCSFB Second priority InterRat for Idle UE parameters to UTRAN, GERAN, GERAN,and UTRAN, respectively.

Step 3 Run the MOD CSFALLBACKPOLICYCFG command with the PS_HO option of theCSFB handover policy Configuration parameter and the REDIRECTION option of theCSFB handover policy Configuration for idle ue parameter selected.

----End

MML Command ExamplesMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSteeringSwitch-1;MOD CSFALLBACKBLINDHOCFG: CnOperatorId=0, InterRatHighestPri=UTRAN,InterRatSecondPri=GERAN,IdleCsfbHighestPri=GERAN,IdleCsfbSecondPri=UTRAN;MOD CSFALLBACKPOLICYCFG: CsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-1, IdleModeCsfbHoPolicyCfg=REDIRECTION-1&CCO_HO-0&PS_HO-0;

8.13.6 Activation ObservationThe signaling procedure is the same as that for CSFB to GERAN. After CS Fallback Steeringto GERAN is used, check whether it works as expected.

The activation observation procedure for CSFB steering to GERAN is as follows:

1. Check that the UE supports redirection-based CSFB and handover-based CSFB.2. Set CSFB policies for RRC_IDLE UEs and RRC_CONNECTED UEs to redirection and

handover, respectively.3. Enable the UE to initiate a voice call in idle mode and in connected mode.4. Observe the counters L.CSFB.E2G, L.RRCRedirection.E2G.CSFB, and

L.IRATHO.E2G.CSFB.ExecAttOut. If the values of the counters increase by 2, 1, and 1,respectively, CSFB steering to GERAN has been activated.

If TDLOFD-001088 CS Fallback Steering to UTRAN has also been activated, the activationobservation procedure is as follows:

1. Check that the UE supports CSFB to GERAN and CSFB to UTRAN.2. Set GERAN as the highest-priority RAT for CSFB triggered for RRC_IDLE UEs and

UTRAN as the highest-priority RAT for CSFB triggered for RRC_CONNECTED UEs.3. Enable the UE to initiate a voice call in idle mode and in connected mode.4. Observe the counters L.CSFB.E2W and L.CSFB.E2G. If both the values increase by 1,

both CSFB steering to UTRAN and CSFB steering to GERAN have been activated.




182

Table 8-51 Parameters for deactivating CSFB steering to GERAN


CellAlgoSwitch HoAllowedSwitch Set GeranCsfbSteeringSwitch ofthe HoAlgoSwitch parameter to 0.





Using MML Commands

Run the MOD CELLALGOSWITCH command with the GeranCsfbSteeringSwitch optionof the Handover Allowed Switch parameter cleared.

MML Command ExamplesMOD CELLALGOSWITCH: LocalCellId=0,HoAllowedSwitch=GeranCsfbSteeringSwitch-0;



8.14 Troubleshooting

8.14.1 CSFB Calling Procedure Failure

Fault Description

A UE performs cell reselection to an inter-RAT neighboring cell directly after initiating avoice call in an E-UTRAN cell, and the S1 interface tracing result shows that CSFB is nottriggered.

Fault Handling

Step 1 Create an S1 interface tracing task, use the UE to camp on the E-UTRAN cell again, andcheck whether the value of the information element (IE) ePS-attach-type-value is "combined-attach" in the traced Attach Request message.



183

l If so, go to Step 2.l If not, replace the UE with one that supports combined EPS/IMSI attach, and try again.

Step 2 Check whether the traced Attach Accept message includes the IE cs-domain-not-available.l If it does, go to Step 3.l If not, contact Huawei technical support.

Step 3 Contact the vendors of core network NEs to ensure the following:l Attach procedures to the CS domain are allowed according to the subscription data on

the HSS.l The core network supports CSFB.l The SGs interface is correctly configured.

----End

8.14.2 eNodeB Receiving No Measurement Report

Fault Description

An eNodeB delivers an RRC Connection Reconfiguration message for measurement controlto a UE that has initiated a voice call in the LTE network, but the eNodeB does not receive ameasurement report.

Fault Handling

Step 1 Check whether the RRC Connection Reconfiguration message contains B1-relatedmeasurement configurations and whether the information about the inter-RAT systems in theconfiguration is correct.l If it is, go to Step 2l If not, rectify the faults and try again.

Step 2 Check whether the coverage of the inter-RAT neighboring cell is satisfactory. If the coverageis unsatisfactory, adjust B1-related parameters or use CSFB based on blind handovers.

For details about how to adjust B1-related parameters, see Inter-RAT Mobility Management inConnected Mode.

----End

8.14.3 CSFB Blind Handover Failure

Fault Description

Even when blind handovers are configured as the preferred choice according to the operatorpolicies, instead of triggering a blind handover for CSFB, an eNodeB delivers an inter-RATmeasurement configuration to a UE that has initiated a voice call.

Fault Handling

Step 1 Run the LST ENODEBALGOSWITCH command and check the setting of BlindHoSwitchunder the Handover Mode Switch parameter. If BlindHoSwitch is Off, run the MOD



184

ENODEBALGOSWITCH command with the BlindHoSwitch(BlindHoSwitch) check boxunder the Handover Mode Switch parameter selected.

Step 2 Run the LST CELLHOPARACFG command and check the setting of BlindHoSwitchunder the Handover Mode Switch parameter. If BlindHoSwitch is Off, run the MODCELLHOPARACFG command with the BlindHoSwitch(BlindHoSwitch) check box underthe Handover Mode Switch parameter selected. In addition, check the CSFB mechanism andperform the following:

l If CSFB to UTRAN is required, go to Step 3.

l If CSFB to GERAN is required, go to Step 4.

Step 3 Run the LST UTRANNCELL command and check whether Blind handover priority is 0for a neighboring UTRAN cell that is supposed to accept incoming blind handovers.

l If Blind handover priority is 0, blind handovers to this cell are not allowed. In thiscase, run the MOD UTRANNCELL command with the Blind handover priorityparameter set to a value other than 0.

l If Blind handover priority is not 0, contact Huawei technical support.

Step 4 Run the LST GERANNCELL command and check whether Blind handover priority is 0for a neighboring GERAN cell that is supposed to accept incoming blind handovers.

l If Blind handover priority is 0, blind handovers to this cell are not allowed. In thiscase, run the MOD GERANNCELL command with the Blind handover priorityparameter set to a value other than 0.

l If Blind handover priority is not 0, contact Huawei technical support.

----End

8.14.4 CSFB Handover Failure

Fault Description

During CSFB to UTRAN procedures with the handover policy set to PS HO, the handoverpreparation success rate is low.

Table 8-52 Counters related to the handover preparation success rate



Number of CSFB-based inter-RAThandover preparation attempts fromE-UTRAN to WCDMA network

1526728505 L.IRATHO.E2W.CSFB.ExecAttOut

Number of CSFB-based inter-RAThandover execution attempts from E-UTRAN to WCDMA network



185

Fault HandlingHere uses the CSFB to UTRAN as an example to describe the fault handling procedure.Similar counters are provided for CSFB to GERAN or to other systems.

Step 1 View the counters listed in Table 8-53 to check the cause for the low handover preparationsuccess rate.

Table 8-53 Counters related to outgoing handover preparation failures


1526730076 L.IRATHO.E2W.CSFB.Prep.FailOut.MME

Number of CSFB-based outgoinghandover preparation failures from E-UTRAN to WCDMA network becauseof the MME side causes

1526730077 L.IRATHO.E2W.CSFB.Prep.FailOut.PrepFailure

Number of CSFB-based outgoinghandover preparation failures from E-UTRAN to WCDMA network becauseof the response of handover preparationfailure from WCDMA network

1526730078 L.IRATHO.E2W.CSFB.Prep.FailOut.NoReply

Number of CSFB-based outgoinghandover preparation failures from E-UTRAN to WCDMA network becauseof no response from WCDMA network

Step 2 Analyze the failure cause based on the values of the preceding counters for each NE.

----End



186

9 Parameters

Table 9-1 Parameters

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellHoParaCfg

HoModeSwitch

MODCELLHOPARACFGLSTCELLHOPARACFG

LOFD-001022 /TDLOFD-001022

LOFD-001023 /TDLOFD-001023

LOFD-001033 /TDLOFD-001033

LOFD-001034 /TDLOFD-001034

LOFD-001019 /TDLOFD-001019

LOFD-001020 /TDLOFD-001020

SRVCCtoUTRAN

SRVCCtoGERAN

CSFallbacktoUTRAN

CSFallbacktoGERAN

PS Inter-RATMobilitybetweenE-UTRANandUTRAN

PS Inter-RATMobilitybetweenE-UTRANandGERAN

Meaning: Indicates the handover method switchesbased on which the eNodeB determines handoverpolicies. BlindHoSwitch: This option specifieswhether to enable blind handover for CSFB. Bindhandover for CSFB is enabled only if this option isselected. A blind handover for CSFB can be triggeredonly if both this option and the BlindHoSwitch optionof the HoModeSwitch parameter in theENodeBAlgoSwitch MO are selected.UtranPsHoSwitch: PS handover to UTRAN issupported only if this option is selected. This optiontakes effect only if the eNodeB-level optionUtranPsHoSwitch of the HoModeSwitch parameter inthe ENodeBAlgoSwitch MO is deselected.UtranSrvccSwitch: SRVCC to UTRAN is supportedonly if this option is selected. This option takes effectonly if the eNodeB-level option UtranSrvccSwitch ofthe HoModeSwitch parameter in theENodeBAlgoSwitch MO is deselected.GeranSrvccSwitch: SRVCC to GERAN is supportedonly if this option is selected. This option takes effectonly if the eNodeB-level option GeranSrvccSwitch ofthe HoModeSwitch parameter in theENodeBAlgoSwitch MO is deselected.UtranRedirectSwitch: Redirection to UTRAN issupported only if this option is selected. This optiontakes effect only if the eNodeB-level optionUtranRedirectSwitch of the HoModeSwitch parameterin the ENodeBAlgoSwitch MO is deselected.GeranRedirectSwitch: Redirection to GERAN issupported only if this option is selected. This option

eRAN TDDCS Fallback Feature Parameter Description 9 Parameters


187

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

TDLOFD-081223TDLOFD-081203

Ultra-FlashCSFB toUTRANUltra-FlashCSFB toGERAN

takes effect only if the eNodeB-level optionGeranRedirectSwitch of the HoModeSwitchparameter in the ENodeBAlgoSwitch MO isdeselected. UFCsfbBlindHoDisSwitch: If both thisoption and the BlindHoSwitch option of the sameparameter are selected, a UE is handed over to aUTRAN or GERAN cell based on measurementresults using ultra-flash CS fallback. If this option isdeselected and the BlindHoSwitch option of the sameparameter is selected, a UE can be blindly handedover to a UTRAN or GERAN cell using ultra-flash CSfallback. This option applies only to LTE TDD cells.GUI Value Range: BlindHoSwitch(BlindHoSwitch),UtranPsHoSwitch(UtranPsHoSwitch),UtranSrvccSwitch(UtranSrvccSwitch),GeranSrvccSwitch(GeranSrvccSwitch),UtranRedirectSwitch(UtranRedirectSwitch),GeranRedirectSwitch(GeranRedirectSwitch),UFCsfbBlindHoDisSwitch(UFCsfbBlindHoDisS-witch)Unit: NoneActual Value Range: BlindHoSwitch,UtranPsHoSwitch, UtranSrvccSwitch,GeranSrvccSwitch, UtranRedirectSwitch,GeranRedirectSwitch, UFCsfbBlindHoDisSwitchDefault Value: BlindHoSwitch:Off,UtranPsHoSwitch:Off, UtranSrvccSwitch:Off,GeranSrvccSwitch:Off, UtranRedirectSwitch:Off,GeranRedirectSwitch:Off, UFCsfbBlindHoDisS-witch:Off



188

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellAlgoSwitch

MeasOptAlgoSwitch

MODCELLALGOSWITCHLSTCELLALGOSWITCH

LOFD-001023 /TDLOFD-001023LBFD-002018 /TDLBFD-002018LOFD-001019 /TDLOFD-001019LOFD-001020 /TDLOFD-001020TDLOFD-001034TDLOFD-081203

SRVCCtoGERANMobilityManagementPS Inter-RATMobilitybetweenE-UTRANandUTRANPS Inter-RATMobilitybetweenE-UTRANandGERANCSFallbacktoGERANUltra-FlashCSFB toGERAN

Meaning:Indicates whether to enable measurement-relatedoptimization algorithms.GSM_MEAS_DEL_INTERFREQ_SW: Indicateswhether to cancel inter-frequency measurements aftera GSM measurement is triggered when the UE isperforming VoIP services. If the UE is performingVoIP services and this option is selected, the eNodeBcancels all inter-frequency measurements when aGSM measurement is triggered. This reduces theGSM measurement reporting delay. If the UE isperforming VoIP services and this option isdeselected, the eNodeB does not cancel inter-frequency measurements when the GSM measurementis triggered. MEAS_OBJ_PREEMPT_SW: Indicateswhether to enable preemption when the number ofmeasurement objects of a UE reaches the specifiedthreshold. If this option is selected and the number ofmeasurement objects of the UE reaches the specifiedthreshold, preemption is enabled to ensure thatmeasurements of algorithms with high priority can bedelivered. If this option is deselected and the numberof measurement objects of the UE reaches thespecified threshold, preemption is disabled and themeasurements of algorithms that are triggered latercannot be delivered.

CSFB_MEAS_DEL_INTERFREQ_SW: Indicateswhether to terminate inter-frequency measurementsafter a GSM frequency measurement starts for an E-UTRAN-to-GERAN CS fallback process. If thisoption is selected, the eNodeB terminates all inter-frequency measurements when a GSM frequencymeasurement is triggered during the CS fallbackprocess, reducing the GSM frequency measurementreporting delay. If this option is deselected, theeNodeB does not terminate inter-frequencymeasurements when a GSM frequency measurementis triggered during the CSFB process. This parameterapplies only to LTE TDD cells.GUI Value Range:GSM_MEAS_DEL_INTERFREQ_SW(Gsm MeasDel Interfreq Switch),MEAS_OBJ_PREEMPT_SW(Meas Obj PreemptSwitch),CSFB_MEAS_DEL_INTERFREQ_SW(Csfb MeasDel Interfreq Switch)Unit: None



189

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

Actual Value Range:GSM_MEAS_DEL_INTERFREQ_SW,MEAS_OBJ_PREEMPT_SW,CSFB_MEAS_DEL_INTERFREQ_SWDefault Value:GSM_MEAS_DEL_INTERFREQ_SW:Off,MEAS_OBJ_PREEMPT_SW:Off,CSFB_MEAS_DEL_INTERFREQ_SW:Off



190

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

GlobalProcSwitch

HoProcCtrlSwitch

MODGLOBALPROCSWITCHLSTGLOBALPROCSWITCH

None None Meaning:Indicates whether to control the handover process.This parameter provides the following options:

HoDataSendCtrlSwitch: If this option is selected, theeNodeB sends data packets to a handover-incomingUE after sending a random access response (RAR) ina non-contention-based random access procedure. Ifthis option is deselected, the eNodeB sends datapackets to the UE after receiving an Msg3 message inthe non-contention-based random access procedure.

ErabFlowFirstSwitch: This option specifies the policyfor handling the conflicts between handover andbearer procedures. If this option is selected and ahandover procedure conflicts with an E-RAB setup,modification, or deletion procedure, the eNodeBperforms as follows: 1. If the handover is not forCSFB or SRVCC, the eNodeB processes the bearerprocedure first. 2. Otherwise, the eNodeB processesthe handover procedure first. If this option isdeselected, the eNodeB processes the handoverprocedure first in the preceding scenario.

CsfbFlowFirstSwitch: This option specifies the policyfor handling the conflicts between handover andCSFB procedures. If this option is selected and thehandover and CSFB procedures conflict, the eNodeBprocesses the CSFB procedure first. If this option isdeselected in the preceding scenario, the eNodeBprocesses the handover procedure first.GUI Value Range: HoDataSendCtrlS-witch(HoDataSendCtrlSwitch),ErabFlowFirstSwitch(ErabFlowFirstSwitch),CsfbFlowFirstSwitch(CsfbFlowFirstSwitch)Unit: NoneActual Value Range: HoDataSendCtrlSwitch,ErabFlowFirstSwitch, CsfbFlowFirstSwitchDefault Value: HoDataSendCtrlSwitch:Off,ErabFlowFirstSwitch:Off, CsfbFlowFirstSwitch:Off



191

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellAlgoSwitch

HoAllowedSwitch


LBFD-00201805/TDLBFD-00201805LOFD-111204LOFD-001033/TDLOFD-001033LOFD-001034/TDLOFD-001034LOFD-001052/TDLOFD-001052LOFD-001053/TDLOFD-001053LOFD-001088/TDLOFD-001088LOFD-001089/TDLOFD-001089

ServiceBasedInter-frequencyHandoverSeparateMobilityPoliciestoGERANforMultiPLMNCSFallbacktoUTRANCSFallbacktoGERANFlashCSFallbacktoUTRANFlashCSFallbacktoGERANCSFallbackSteeringtoUTRANCSFallbackSteeringtoGERAN

Meaning: Indicates whether to enable eNodeB-levelhandovers to be activated in the cell when relatedeNodeB-level handover switches are on.SrvBasedInterFreqHoSw: Indicates whether to enableservice-based inter-frequency handover to be activatedin the cell. Service-based inter-frequency handover isallowed to be activated in the cell only when thisswitch is on. GeranSepOpMobilitySwitch: Indicateswhether to differentiate mobility policies for GERANoperators. When this switch is on, different networkpolicies can be applied to different GERAN operators.Such policies include SRVCC and SI obtainingthrough RIM procedures. When this switch is off,different network policies cannot be applied todifferent GERAN operators. This option applies onlyto FDD cells. UtranCsfbSwitch: Indicates whether toenable CSFB for UTRAN. When this switch is on,CSFB to UTRAN is allowed. When this switch is off,the UTRAN CSFB algorithm is disabled. If eNodeB-level UtranCsfbSwitch is on, local-cell-levelparameter settings do not take effect. If eNodeB-levelUtranCsfbSwitch is off, local-cell-level parametersettings take effect. GeranCsfbSwitch: Indicateswhether to enable CSFB for GERAN. When thisswitch is on, CSFB to GERAN is allowed. When thisswitch is off, the GERAN CSFB algorithm isdisabled. If eNodeB-level GeranCsfbSwitch is on,local-cell-level parameter settings do not take effect. IfeNodeB-level GeranCsfbSwitch is off, local-cell-levelparameter settings take effect. UtranFlashCsfbSwitch:This switch does not take effect if UtranCsfbSwitch isoff. When the UtranFlashCsfbSwitch is on, flashCSFB to UTRAN is enabled, and UTRAN systeminformation is carried during redirection. When theUtranFlashCsfbSwitch is off, flash CSFB to UTRANis disabled. If eNodeB-level UtranFlashCsfbSwitch ison, local-cell-level parameter settings do not takeeffect. If eNodeB-level UtranFlashCsfbSwitch is off,local-cell-level parameter settings take effect.GeranFlashCsfbSwitch: This switch does not takeeffect if GeranCsfbSwitch is off. When theGeranFlashCsfbSwitch is on, flash CSFB to GERANis enabled, and GERAN system information is carriedduring redirection. When the GeranFlashCsfbSwitchis off, flash CSFB to GERAN is disabled. If eNodeB-level GeranFlashCsfbSwitch is on, local-cell-levelparameter settings do not take effect. If eNodeB-levelGeranFlashCsfbSwitch is off, local-cell-level



192

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

parameter settings take effect. CsfbAdaptiveBlind-HoSwitch: This switch does not take effect ifBlindHoSwitch is off. If both the BlindHoSwitch andUFCsfbBlindHoDisSwitch options are selected, theCsfbAdaptiveBlindHoSwitch option of theHoAlgoSwitch parameter does not take effect when aUE is handed over to a UTRAN or GERAN cell usingultra-flash CS fallback. When this switch is on, CSFBadaptive blind handover is enabled. In this situation,an optimal handover mode is used depending on UEposition in the CSFB scenario. When this switch isoff, CSFB adaptive blind handover is disabled. IfeNodeB-level CsfbAdaptiveBlindHoSwitch is on,local-cell-level parameter settings do not take effect. IfeNodeB-level CsfbAdaptiveBlindHoSwitch is off,local-cell-level parameter settings take effect.UtranCsfbSteeringSwitch: UTRAN CSFB steering isenabled when this switch is on. In this case,RRC_IDLE UEs can use separate configurationpolicies when triggering CSFB. UTRAN CSFBsteering is disabled when this switch is off. IfeNodeB-level UtranCsfbSteeringSwitch is on, local-cell-level parameter settings do not take effect. IfeNodeB-level UtranCsfbSteeringSwitch is off, local-cell-level parameter settings take effect.GeranCsfbSteeringSwitch: GERAN CSFB steering isenabled when this switch is on. In this case,RRC_IDLE UEs can use separate configurationpolicies when triggering CSFB. GERAN CSFBsteering is disabled when this switch is off. IfeNodeB-level GeranCsfbSteeringSwitch is on, local-cell-level parameter settings do not take effect. IfeNodeB-level GeranCsfbSteeringSwitch is off, local-cell-level parameter settings take effect.GUI Value Range: SrvBasedInterFreq-HoSw(SrvBasedInterFreqHoSw),GeranSepOpMobilitySwitch(GeranSepOpMobility-Switch), UtranCsfbSwitch(UtranCsfbSwitch),GeranCsfbSwitch(GeranCsfbSwitch),UtranFlashCsfbSwitch(UtranFlashCsfbSwitch),GeranFlashCsfbSwitch(GeranFlashCsfbSwitch),CsfbAdaptiveBlindHoSwitch(CsfbAdaptiveBlind-HoSwitch), UtranCsfbSteeringS-witch(UtranCsfbSteeringSwitch),GeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch)Unit: NoneActual Value Range: SrvBasedInterFreqHoSw,GeranSepOpMobilitySwitch, UtranCsfbSwitch,



193

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

GeranCsfbSwitch, UtranFlashCsfbSwitch,GeranFlashCsfbSwitch, CsfbAdaptiveBlindHoSwitch,UtranCsfbSteeringSwitch, GeranCsfbSteeringSwitchDefault Value: SrvBasedInterFreqHoSw:On,GeranSepOpMobilitySwitch:Off,UtranCsfbSwitch:Off, GeranCsfbSwitch:Off,UtranFlashCsfbSwitch:Off, GeranFlashCsfbS-witch:Off, CsfbAdaptiveBlindHoSwitch:Off,UtranCsfbSteeringSwitch:Off, GeranCsfbSteeringS-witch:Off



194

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellAlgoSwitch

FreqLayerSwitch


LOFD-001087LOFD-001078 /TDLOFD-001078LOFD-001022/TDLOFD-001022LOFD-001033/TDLOFD-001033LOFD-001052/TDLOFD-001052LOFD-001088/TDLOFD-001088

SRVCCFlexibleSteeringtoUTRANE-UTRANtoUTRANCS/PSSteeringSRVCCtoUTRANCSFallbacktoUTRANFlashCSFallbacktoUTRANCSFallbackSteeringtoUTRAN

Meaning:This parameter includes the following three options:UtranFreqLayerMeasSwitch, UtranFreqLayerBlind-Switch, and UtranSrvccSteeringSwitch. The setting ofthe option UtranSrvccSteeringSwitch takes effect onlywhen the UtranFreqLayerMeasSwitch option isselected.

If the UtranFreqLayerMeasSwitch option is selected,UTRAN frequency steering takes effect atmeasurement configuration delivery for coverage-based handovers to UTRAN or CSFB to UTRAN.This cell-specific parameter setting takes effect onlywhen the eNodeB-specific UtranFreqLayerMeasS-witch option is deselected.

If the UtranFreqLayerBlindSwitch option is selected,UTRAN frequency steering takes effect at blindcoverage-based handovers to UTRAN or blind CSFBto UTRAN. This cell-specific parameter setting takeseffect only when the eNodeB-specificUtranFreqLayerBlindSwitch option is deselected.

If the UtranSrvccSteeringSwitch option is selected,UTRAN frequency steering based on measurementstakes effect at coverage-based SRVCC to UTRAN.This option applies only to FDD. This cell-specificparameter setting takes effect only when the eNodeB-specific UtranSrvccSteeringSwitch option isdeselected.GUI Value Range: UtranFreqLayerMeasS-witch(UtranFreqLayerMeasSwitch),UtranFreqLayerBlindSwitch(UtranFreqLayerBlind-Switch), UtranSrvccSteeringSwitch(UtranSrvccSteer-ingSwitch)Unit: NoneActual Value Range: UtranFreqLayerMeasSwitch,UtranFreqLayerBlindSwitch, UtranSrvccSteeringS-witchDefault Value: UtranFreqLayerMeasSwitch:Off,UtranFreqLayerBlindSwitch:Off, UtranSrvccSteer-ingSwitch:Off



195

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ENodeBAlgoSwitch

HoAlgoSwitch

MODENODEBALGOSWITCHLSTENODEBALGOSWITCH

LBFD-00201801/TDLBFD-00201801LBFD-00201802/TDLBFD-00201802LBFD-00201804/TDLBFD-00201804LBFD-00201805/TDLBFD-00201805LOFD-001033 /TDLOFD-001033LOFD-001034 /TDLOFD-001034LOFD-001035 /TDLOFD-001035LOFD-001052 /TDLOFD-001052LOFD-001053 /

Coverage BasedIntra-frequencyHandoverDistanceBasedInter-frequencyHandoverServiceBasedInter-frequencyHandoverCSFallbacktoUTRANCSFallbacktoGERANCSFallbacktoCDMA20001xRTTFlashCSFallbacktoUTRANFlashCSFallbacktoGERANCSFallback

Meaning: Indicates whether to enable handoveralgorithms. This parameter includes the followingoptions: IntraFreqCoverHoSwitch: If this option isselected, coverage-based intra-frequency handoversare enabled to ensure service continuity. If this optionis deselected, coverage-based intra-frequencyhandovers are disabled. InterFreqCoverHoSwitch: Ifthis option is selected, coverage-based inter-frequencyhandovers are enabled to ensure service continuity. Ifthis option is deselected, coverage-based inter-frequency handovers are disabled. UtranCsfbSwitch:If this option is selected, CSFB to UTRAN is enabledand UEs can fall back to UTRAN. If this option isdeselected, CSFB to UTRAN is disabled.GeranCsfbSwitch: If this option is selected, CSFB toGERAN is enabled and UEs can fall back to GERAN.If this option is deselected, CSFB to GERAN isdisabled. Cdma1xRttCsfbSwitch: If this option isselected, CSFB to CDMA2000 1xRTT is enabled andUEs can fall back to CDMA2000 1xRTT. If thisoption is deselected, CSFB to CDMA2000 1xRTT isdisabled. UtranServiceHoSwitch: If this option isselected, service-based handovers to UTRAN areenabled and UEs using a specific type of services canbe handed over to UTRAN. If this option isdeselected, service-based handovers to UTRAN aredisabled. GeranServiceHoSwitch: If this option isselected, service-based handovers to GERAN areenabled and UEs using a specific type of services canbe handed over to GERAN. If this option isdeselected, service-based handovers to GERAN aredisabled. CdmaHrpdServiceHoSwitch: If this option isselected, service-based handovers to CDMA2000HRPD cells are enabled and UEs using a specific typeof services can be handed over to CDMA2000 HRPDcells. If this option is deselected, service-basedhandovers to CDMA2000 HRPD cells are disabled.This option is not supported in this version.Cdma1xRttServiceHoSwitch: If this option isselected, service-based handovers to CDMA20001xRTT are enabled and UEs using a specific type ofservices can be handed over to CDMA2000 1xRTT. Ifthis option is deselected, service-based handovers toCDMA2000 1xRTT are disabled. This option is notsupported in this version. UlQualityInterRATHoS-witch: If this option is selected, UL-quality-basedinter-RAT handovers are enabled and UEs can behanded over to inter-RAT cells to ensure service



196

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

TDLOFD-001053LOFD-001088 /TDLOFD-001088LOFD-001089 /TDLOFD-001089LOFD-001090 /TDLOFD-001090LOFD-001019 /TDLOFD-001019LOFD-001020 /TDLOFD-001020LOFD-001043 /TDLOFD-001043LOFD-001046 /TDLOFD-001046LOFD-001072 /TDLOFD-001072LOFD-001073 /TDLOF

SteeringtoUTRANCSFallbackSteeringtoGERANEnhanced CSFallbacktoCDMA20001xRTTPS Inter-RATMobilitybetweenE-UTRANandUTRANPS Inter-RATMobilitybetweenE-UTRANandGERANServicebasedinter-RAThandover toUTRANServicebasedinter-RAThandover toGERANDistancebased

continuity when the UL signal quality is poor. If thisoption is deselected, UL-quality-based inter-RAThandovers are disabled. InterPlmnHoSwitch: If thisoption is selected, inter-PLMN handovers are enabledand UEs can be handed over to cells in other PLMNs.If this option is deselected, inter-PLMN handovers aredisabled. UtranFlashCsfbSwitch: This option takeseffect only when the UtranCsfbSwitch option isselected. If the UtranFlashCsfbSwitch option isselected, flash CSFB to UTRAN is enabled and theeNodeB sends system information of candidate targetUTRAN cells to UEs during redirection. If theUtranFlashCsfbSwitch option is deselected, flashCSFB to UTRAN is disabled. GeranFlashCsfbSwitch:This option takes effect only when theGeranCsfbSwitch option is selected. If theGeranFlashCsfbSwitch option is selected, flash CSFBto GERAN is enabled and the eNodeB sends systeminformation of candidate target GERAN cells to UEsduring redirection. If the GeranFlashCsfbSwitchoption is deselected, flash CSFB to GERAN isdisabled. ServiceBasedInterFreqHoSwitch: If thisoption is selected, service-based inter-frequencyhandovers are enabled and UEs using a specific typeof services can be handed over to inter-frequencycells. If this option is deselected, service-based inter-frequency handovers are disabled.UlQualityInterFreqHoSwitch: If this option isselected, UL-quality-based inter-frequency handoversare enabled and UEs can be handed over to inter-frequency cells to ensure service continuity when theUL signal quality is poor. If this option is deselected,UL-quality-based inter-frequency handovers aredisabled. CsfbAdaptiveBlindHoSwitch: This optiontakes effect only when blind handovers are enabled. Ifboth the BlindHoSwitch and UFCsfbBlindHoDisS-witch options are selected, the CsfbAdaptiveBlind-HoSwitch option of the HoAlgoSwitch parameterdoes not take effect when a UE is handed over to aUTRAN or GERAN cell using ultra-flash CS fallback.If the CsfbAdaptiveBlindHoSwitch option is selected,adaptive blind handovers for CSFB are enabled andappropriate handover mechanisms are selected forUEs based on their locations. If theCsfbAdaptiveBlindHoSwitch option is deselected,adaptive blind handovers for CSFB are disabled.UtranCsfbSteeringSwitch: If this option is selected,CSFB steering to UTRAN is enabled and CSFB



197

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

D-001073TDLBFD-002018TDLOFD-001022TDLOFD-070228LOFD-081283 /TDLOFD-081203LOFD-070202 /TDLOFD-070202TDLOFD-081223

inter-RAThandover toUTRAN

Distancebasedinter-RAThandover toGERAN

MobilityManagement

Coverage BasedInter-frequencyHandover

SRVCCtoUTRAN

Service-RequestBasedInter-frequencyHandover


Ultra-FlashCSFB toUTRAN


policies for UEs in idle mode can be configured. Ifthis option is deselected, CSFB steering to UTRAN isdisabled. GeranCsfbSteeringSwitch: If this option isselected, CSFB steering to GERAN is enabled andCSFB policies for UEs in idle mode can beconfigured. If this option is deselected, CSFB steeringto GERAN is disabled. CSFBLoadInfoSwitch: If thisoption is selected, load-based CSFB is enabled and atarget cell for CSFB is selected based on loads ofcandidate target cells. If this option is deselected,load-based CSFB is disabled. Cdma1XrttEcsfbSwitch:If this option is selected, eCSFB to CDMA20001xRTT is enabled and UEs can fall back toCDMA2000 1xRTT through handovers. If this optionis deselected, eCSFB to CDMA2000 1xRTT isdisabled. EmcBlindHoA1Switch: If this option isselected, blind handover event A1 measurements areenabled. If a blind handover event measurementconflicts with a handover procedure, an emergencyblind handover can be triggered after the handoverprocedure is complete. If this option is deselected,blind handover event A1 measurements are disabled.If a blind handover event measurement conflicts witha handover procedure, an emergency blind handovercannot be triggered. EmcInterFreqBlindHoSwitch: Ifthis option is selected, the eNodeB preferentiallyperforms an inter-frequency blind handover when anemergency blind handover is triggered. If this optionis deselected, the eNodeB only performs an inter-RATblind handover when an emergency blind handover istriggered. EPlmnSwitch: Indicates whether handoversto neighboring cells under the equivalent PLMNs(EPLMNs) are allowed. When inter-PLMN handoversare allowed, handovers to neighboring cells under theEPLMNs are allowed if this option is selected, and notallowed if this option is deselected. The EPLMNs aredelivered by the MME to the UE. ServiceBasedInter-FreqHoSwitch: If this option is selected, service-basedinter-frequency handovers are enabled and UEs usinga specific type of services can be handed over to inter-frequency cells. If this option is deselected, service-based inter-frequency handovers are disabled. Thisoption applies only to LTE TDD.VoipHoControlSwitch: Indicates whether the eNodeBfilters out target cells that do not support VoLTEservices when processing intra-RAT handovers forVoLTE services. UtranUltraFlashCsfbSwitch: If thisoption is selected, ultra-flash CSFB to UTRAN is



198

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

enabled. If this option is deselected, ultra-flash CSFBto UTRAN is disabled. GeranUltraFlashCsfbSwitch:If this option is selected, ultra-flash CSFB to GERANis enabled. If this option is deselected, ultra-flashCSFB to GERAN is disabled. RatLayerSwitch: If thisoption is selected, the eNodeB selects different targetRATs for voice services and data services duringcoverage-based inter-RAT handovers. If this option isdeselected, the eNodeB does not select different targetRATs for voice services and data services duringcoverage-based inter-RAT handovers.GUI Value Range: IntraFreqCoverHoS-witch(IntraFreqCoverHoSwitch), InterFreqCoverHoS-witch(InterFreqCoverHoSwitch),UtranCsfbSwitch(UtranCsfbSwitch),GeranCsfbSwitch(GeranCsfbSwitch),Cdma1xRttCsfbSwitch(Cdma20001xRttCsfbSwitch),UtranServiceHoSwitch(UtranServiceHoSwitch),GeranServiceHoSwitch(GeranServiceHoSwitch),CdmaHrpdServiceHoS-witch(Cdma2000HrpdServiceHoSwitch),Cdma1xRttServiceHoSwitch(Cdma20001xRttServiceHoSwitch), UlQualityInterRATHoS-witch(UlQualityInterRATHoSwitch),InterPlmnHoSwitch(InterPlmnHoSwitch),UtranFlashCsfbSwitch(UtranFlashCsfbSwitch),GeranFlashCsfbSwitch(GeranFlashCsfbSwitch),ServiceBasedInterFreqHoSwitch(ServiceBasedInter-FreqHoSwitch), UlQualityInterFreqHoS-witch(UlQualityInterFreqHoSwitch),CsfbAdaptiveBlindHoSwitch(CsfbAdaptiveBlind-HoSwitch), UtranCsfbSteeringS-witch(UtranCsfbSteeringSwitch),GeranCsfbSteeringSwitch(GeranCsfbSteeringSwitch),CSFBLoadInfoSwitch(CSFBLoadInfoSwitch),Cdma1XrttEcsfbSwitch(Cdma1XrttEcsfbSwitch),EmcBlindHoA1Switch(EmcBlindHoA1Switch),EmcInterFreqBlindHoSwitch(EmcInterFreqBlind-HoSwitch), EPlmnSwitch(EPlmnSwitch),ServiceReqInterFreqHoSwitch(ServiceReqInterFreq-HoSwitch),VoipHoControlSwitch(VoipHoControlSwitch),UtranUltraFlashCsfbSwitch(UtranUltraFlashCsfbS-witch), GeranUltraFlashCsfbS-witch(GeranUltraFlashCsfbSwitch),RatLayerSwitch(RatLayerSwitch)Unit: None



199

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

Actual Value Range: IntraFreqCoverHoSwitch,InterFreqCoverHoSwitch, UtranCsfbSwitch,GeranCsfbSwitch, Cdma1xRttCsfbSwitch,UtranServiceHoSwitch, GeranServiceHoSwitch,CdmaHrpdServiceHoSwitch,Cdma1xRttServiceHoSwitch, UlQualityInterRA-THoSwitch, InterPlmnHoSwitch, UtranFlashCsfbS-witch, GeranFlashCsfbSwitch, ServiceBasedInter-FreqHoSwitch, UlQualityInterFreqHoSwitch,CsfbAdaptiveBlindHoSwitch, UtranCsfbSteeringS-witch, GeranCsfbSteeringSwitch,CSFBLoadInfoSwitch, Cdma1XrttEcsfbSwitch,EmcBlindHoA1Switch, EmcInterFreqBlindHoSwitch,EPlmnSwitch, ServiceReqInterFreqHoSwitch,VoipHoControlSwitch, UtranUltraFlashCsfbSwitch,GeranUltraFlashCsfbSwitch, RatLayerSwitchDefault Value: IntraFreqCoverHoSwitch:On,InterFreqCoverHoSwitch:On, UtranCsfbSwitch:Off,GeranCsfbSwitch:Off, Cdma1xRttCsfbSwitch:Off,UtranServiceHoSwitch:Off, GeranServiceHoS-witch:Off, CdmaHrpdServiceHoSwitch:Off,Cdma1xRttServiceHoSwitch:Off, UlQualityInterRA-THoSwitch:Off, InterPlmnHoSwitch:Off,UtranFlashCsfbSwitch:Off, GeranFlashCsfbS-witch:Off, ServiceBasedInterFreqHoSwitch:Off,UlQualityInterFreqHoSwitch:Off,CsfbAdaptiveBlindHoSwitch:Off,UtranCsfbSteeringSwitch:Off, GeranCsfbSteeringS-witch:Off, CSFBLoadInfoSwitch:Off,Cdma1XrttEcsfbSwitch:Off,EmcBlindHoA1Switch:Off, EmcInterFreqBlindHoS-witch:Off, EPlmnSwitch:Off, ServiceReqInterFreq-HoSwitch:Off, VoipHoControlSwitch:Off,UtranUltraFlashCsfbSwitch:Off,GeranUltraFlashCsfbSwitch:Off, RatLayerSwitch:Off



200

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

GlobalProcSwitch

UeCompatSwitch


LBFD-00201802/TDLBFD-00201802LBFD-00201804/TDLBFD-00201804LBFD-00201805/TDLBFD-00201805

Coverage BasedInter-frequencyHandoverDistanceBasedInter-FrequencyHandoverServiceBasedInter-frequencyHandover

Meaning:Indicates whether to enable compatibility optimizationfunctions for UEs to control the differentiatedhandling of abnormal UEs.

AbnormalUeHandleSwitch: This option specifieswhether to enable handling of abnormal UEs. Thisfunction is enabled only if this option is selected.

PerExtendBitSw: Indicate whether to encode extendedbit indicators for Uu messages if extended IEsspecified by later 3GPP releases are not included inUu message code. If this option is selected, extendedbit indicators are not encoded. If this option isdeselected, extended bit indicators are encoded.

InterFddTddMeasComOptSw: Indicates whether toenable compatibility optimization on inter-duplex-mode measurements for UEs. If a UE can send inter-duplex-mode measurement reports but actually cannotperform inter-duplex-mode measurements, this UEincompatibility issue may cause an increase in theservice drop rate. If this option is selected, theeNodeB is not allowed to deliver inter-duplex-modemeasurement configurations to such UEs.

MOUeCompatEffectSw: Indicates whether theUeCompat MO takes effect. If this option is selected,the UeCompat MO but not the UeCompatOpt MOtakes effect. If this option is deselected, theUeCompatOpt MO but not the UeCompat MO takeseffect.GUI Value Range: AbnormalUeHandleS-witch(AbnormalUeHandleSwitch), UltraFlashCsfbCo-mOptSw(UltraFlashCsfbComOptSw),ForbidR8R9UeAccessB41Sw(ForbidR8R9UeAccessB41Sw),MOUeCompatEffectSw( MOUeCompatEffectSw),PerExtendBitSw(PerExtendBitSw),InterFddTddMeasComOptSw(InterFddTddMeasCo-mOptSw)Unit: NoneActual Value Range: AbnormalUeHandleSwitch,UltraFlashCsfbComOptSw,ForbidR8R9UeAccessB41Sw,MOUeCompatEffectSw, PerExtendBitSw,InterFddTddMeasComOptSwDefault Value: AbnormalUeHandleSwitch:Off,UltraFlashCsfbComOptSw:Off,



201

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ForbidR8R9UeAccessB41Sw:Off,MOUeCompatEffectSw:Off, PerExtendBitSw:Off,InterFddTddMeasComOptSw:Off

ENodeBAlgoSwitch

FreqLayerSwtich


LOFD-001087LOFD-001078 /TDLOFD-001078TDLOFD-001022TDLOFD-001033TDLOFD-001052TDLOFD-001088

SRVCCFlexibleSteeringtoUTRAN

E-UTRANtoUTRANCS/PSSteering

SRVCCtoUTRAN

CSFallbacktoUTRAN

FlashCSFallbacktoUTRAN

CSFallbackSteeringtoUTRAN

Meaning: This parameter includes the following threeswitches: UtranFreqLayerMeasSwitch,UtranFreqLayerBlindSwitch, and UtranSrvccSwitch.The setting of UtranSrvccSwitch takes effect onlywhen UtranFreqLayerMeasSwitch is on. IfUtranFreqLayerMeasSwitch is on, the UTRANhierarchy-based measurement algorithm takes effectfor measurements related to coverage-based andCSFB-triggered handovers from E-UTRAN toUTRAN. If UtranFreqLayerBlindSwitch is on, theUTRAN hierarchy-based blind-handover algorithmtakes effect for coverage-based and CSFB-triggeredblind handovers from E-UTRAN to UTRAN. IfUtranSrvccSwitch is on, the UTRAN SRVCChierarchy-based measurement algorithm takes effectfor coverage-based SRVCC-triggered handovers fromE-UTRAN to UTRAN.GUI Value Range: UtranFreqLayerMeasS-witch(UtranFreqLayerMeasSwitch),UtranFreqLayerBlindSwitch(UtranFreqLayerBlind-Switch), UtranSrvccSteeringSwitch(UtranSrvccSteer-ingSwitch)Unit: NoneActual Value Range: UtranFreqLayerMeasSwitch,UtranFreqLayerBlindSwitch, UtranSrvccSteeringS-witchDefault Value: UtranFreqLayerMeasSwitch:Off,UtranFreqLayerBlindSwitch:Off, UtranSrvccSteer-ingSwitch:Off



202

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

UtranNFreq

CsPriority

ADDUTRANNFREQMODUTRANNFREQLSTUTRANNFREQ

LOFD-001078 /TDLOFD-001078TDLOFD-001033TDLOFD-001052TDLOFD-001088

E-UTRANtoUTRANCS/PSSteeringCSFallbacktoUTRANFlashCSFallbacktoUTRANCSFallbackSteeringtoUTRAN

Meaning: Indicates the circuit switched (CS) priorityof the neighboring UTRAN frequency, that is, thepriority for the neighboring UTRAN frequency tocarry CS services. During CSFB-based CS servicehandovers with UtranFreqLayerMeasSwitch being on,the eNodeB selects and delivers the neighboringUTRAN frequencies based on the CS priorities whenstarting measurements. The eNodeB preferentiallydelivers the UTRAN frequency with the highest CSpriority to measure. During CSFB-based CS servicehandovers with UtranFreqLayerBlindSwitch being on,the eNodeB selects the target cells for blind handoverson neighboring UTRAN frequencies based on the CSpriorities and preferentially selects the target cell forblind handovers on the neighboring UTRANfrequency with the highest CS priorities. If thisparameter is set to Priority_0, this neighboringUTRAN frequency is not prioritized.GUI Value Range: Priority_0(Priority 0),Priority_1(Priority 1), Priority_2(Priority 2),Priority_3(Priority 3), Priority_4(Priority 4),Priority_5(Priority 5), Priority_6(Priority 6),Priority_7(Priority 7), Priority_8(Priority 8),Priority_9(Priority 9), Priority_10(Priority 10),Priority_11(Priority 11), Priority_12(Priority 12),Priority_13(Priority 13), Priority_14(Priority 14),Priority_15(Priority 15), Priority_16(Priority 16)Unit: NoneActual Value Range: Priority_0, Priority_1,Priority_2, Priority_3, Priority_4, Priority_5,Priority_6, Priority_7, Priority_8, Priority_9,Priority_10, Priority_11, Priority_12, Priority_13,Priority_14, Priority_15, Priority_16Default Value: Priority_2(Priority 2)



203

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CSFallBackBlindHoCfg

IdleCsfbHighestPri

MODCSFALLBACKBLINDHOCFGLSTCSFALLBACKBLINDHOCFG

LOFD-001035 /TDLOFD-001035LOFD-001088 /TDLOFD-001088LOFD-001089 /TDLOFD-001089TDLOFD-001090

CSFallbacktoCDMA20001xRTTCSFallbackSteeringtoUTRANCSFallbackSteeringtoGERANEnhanced CSFallbacktoCDMA20001xRTT

Meaning:Indicates the highest-priority RAT for CSFB initiatedby a UE in idle mode. It is UTRAN by default. If thisparameter is set to UTRAN, GERAN, or CDMA2000,the highest-priority RAT is UTRAN, GERAN, orCDMA2000, respectively.

The value CDMA2000 is invalid in the currentversion. Therefore, avoid setting this parameter toCDMA2000.GUI Value Range: UTRAN, GERAN, CDMA2000Unit: NoneActual Value Range: UTRAN, GERAN, CDMA2000Default Value: UTRAN



204

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellOpHoCfg

IdleCsfbHighestPri

ADDCELLOPHOCFGMODCELLOPHOCFGLSTCELLOPHOCFG

LOFD-001033 /TDLOFD-001033LOFD-001034 /TDLOFD-001034LOFD-001035 /TDLOFD-001035LOFD-001052 /TDLOFD-001052LOFD-001053 /TDLOFD-001053LOFD-001090 /TDLOFD-001090LOFD-070202 /TDLOFD-070202LOFD-081283 /TDLOFD-081203

CSFallbacktoUTRAN

CSFallbacktoGERAN

CSFallbacktoCDMA20001xRTT


FlashCSFallbacktoGERAN

Enhanced CSFallbacktoCDMA20001xRTT



Meaning: Indicates the highest-priority target RAT forCSFB initiated by UEs in idle mode. It is UTRAN bydefault. This parameter can be set to UTRAN,GERAN, or CDMA2000.GUI Value Range: UTRAN, GERAN, CDMA2000Unit: NoneActual Value Range: UTRAN, GERAN, CDMA2000Default Value: UTRAN



205

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description


IdleCsfbSecondPri




Meaning:Indicates the medium-priority RAT for CSFB initiatedby a UE in idle mode. It is GERAN by default. If thisparameter is set to UTRAN, GERAN, or CDMA2000,the medium-priority RAT is UTRAN, GERAN, orCDMA2000, respectively. If this parameter is set toNULL, no medium-priority RAT is specified and onlythe highest-priority RAT can be selected for CSFBinitiated by a UE in idle mode.

The value CDMA2000 is invalid in the currentversion. Therefore, avoid setting this parameter toCDMA2000.GUI Value Range: UTRAN, GERAN, CDMA2000,NULLUnit: NoneActual Value Range: UTRAN, GERAN, CDMA2000,NULLDefault Value: GERAN



206

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellOpHoCfg

IdleCsfbSecondPri



CSFallbacktoUTRAN

CSFallbacktoGERAN







Meaning: Indicates the medium-priority target RATfor CSFB initiated by UEs in idle mode. It is GERANby default. If this parameter is set to UTRAN,GERAN, or CDMA2000, the medium-priority targetRAT is UTRAN, GERAN, or CDMA2000,respectively. If this parameter is set to NULL, nomedium-priority target RAT is specified and only thehighest-priority target RAT can be selected for CSFBinitiated by UEs in idle mode.GUI Value Range: UTRAN, GERAN, CDMA2000,NULLUnit: NoneActual Value Range: UTRAN, GERAN, CDMA2000,NULLDefault Value: GERAN



207

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description


IdleCsfbLowestPri




Meaning:Indicates the lowest-priority RAT for CSFB initiatedby a UE in idle mode. It is CDMA2000 by default. Ifthis parameter is set to UTRAN, GERAN, orCDMA2000, the lowest-priority RAT is UTRAN,GERAN, or CDMA2000, respectively. If thisparameter is set to NULL, no lowest-priority RAT isspecified and only the highest- or medium-priorityRAT can be selected for CSFB initiated by a UE inidle mode.

The value CDMA2000 is invalid in the currentversion. Therefore, avoid setting this parameter toCDMA2000.GUI Value Range: UTRAN, GERAN, CDMA2000,NULLUnit: NoneActual Value Range: UTRAN, GERAN, CDMA2000,NULLDefault Value: CDMA2000



208

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellOpHoCfg

IdleCsfbLowestPri



CSFallbacktoUTRAN

CSFallbacktoGERAN







Meaning: Indicates the lowest-priority target RAT forCSFB initiated by UEs in idle mode. It is CDMA2000by default. If this parameter is set to UTRAN,GERAN, or CDMA2000, the lowest-priority targetRAT is UTRAN, GERAN, or CDMA2000,respectively. If this parameter is set to NULL, nolowest-priority target RAT is specified and only thehighest- or medium-priority target RAT can beselected for CSFB initiated by UEs in idle mode.GUI Value Range: UTRAN, GERAN, CDMA2000,NULLUnit: NoneActual Value Range: UTRAN, GERAN, CDMA2000,NULLDefault Value: CDMA2000



209

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CSFallBackPolicyCfg

IdleModeCsfbHoPolicyCfg

MODCSFALLBACKPOLICYCFGLSTCSFALLBACKPOLICYCFG

LOFD-001088 /TDLOFD-001088LOFD-001089 /TDLOFD-001089

CSFallbackSteeringtoUTRANCSFallbackSteeringtoGERAN

Meaning: Indicates the CSFB policy for a UE in idlemode. The policy can be PS handover, CCO, orredirection.GUI Value Range: REDIRECTION, CCO_HO,PS_HOUnit: NoneActual Value Range: REDIRECTION, CCO_HO,PS_HODefault Value: REDIRECTION:On, CCO_HO:On,PS_HO:On



210

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description


InterRatHighestPri


LOFD-001033 /TDLOFD-001033LOFD-001034 /TDLOFD-001034LOFD-001035 /TDLOFD-001035LOFD-001019 /TDLOFD-001019LOFD-001020 /TDLOFD-001020LOFD-001021TDLOFD-001052TDLOFD-001053TDLOFD-001090TDLOFD-001043TDLOFD-001072TDLOFD-001046

CSFallbacktoUTRANCSFallbacktoGERANCSFallbacktoCDMA20001xRTTPS Inter-RATMobilitybetweenE-UTRANandUTRANPS Inter-RATMobilitybetweenE-UTRANandGERANPS Inter-RATMobilitybetweenE-UTRANandCDMA2000FlashCSFallbacktoUTRANFlashCSFallback

Meaning:Indicates the highest-priority RAT for handovers. It isUTRAN by default. If this parameter is set toUTRAN, GERAN, or CDMA2000, the highest-priority RAT is UTRAN, GERAN, or CDMA2000,respectively.

The value CDMA2000 is invalid in the currentversion. Therefore, avoid setting this parameter toCDMA2000.GUI Value Range: UTRAN, GERAN, CDMA2000Unit: NoneActual Value Range: UTRAN, GERAN, CDMA2000Default Value: UTRAN



211

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

TDLOFD-001073

toGERANEnhanced CSFallbacktoCDMA20001xRTTServicebasedInter-RAThandover toUTRANDistancebasedInter-RAThandover toUTRANServicebasedInter-RAThandover toGERANDistancebasedInter-RAThandover toGERAN



212

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellOpHoCfg

InterRatHighestPri


LOFD-001033 /TDLOFD-001033LOFD-001034 /TDLOFD-001034LOFD-001035 /TDLOFD-001035LOFD-001019 /TDLOFD-001019LOFD-001020 /TDLOFD-001020LOFD-001021 /TDLOFD-001021LOFD-001052 /TDLOFD-001052LOFD-001053 /TDLOFD-001053LOFD-001090 /TDLOFD-001090


Meaning: Indicates the highest-priority target RAT forhandovers. It is UTRAN by default. This parametercan be set to UTRAN, GERAN, or CDMA2000.GUI Value Range: UTRAN, GERAN, CDMA2000Unit: NoneActual Value Range: UTRAN, GERAN, CDMA2000Default Value: UTRAN



213

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description


toGERANEnhanced CSFallbacktoCDMA20001xRTTUltra-FlashCSFB toUTRANUltra-FlashCSFB toGERAN



214

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description


InterRatSecondPri




Meaning:Indicates the medium-priority RAT for handovers. It isGERAN by default. If this parameter is set toUTRAN, GERAN, or CDMA2000, the medium-priority RAT is UTRAN, GERAN, or CDMA2000,respectively. If this parameter is set to NULL, nomedium-priority RAT is specified and only thehighest-priority RAT can be selected for handovers.

The value CDMA2000 is invalid in the currentversion. Therefore, avoid setting this parameter toCDMA2000.GUI Value Range: UTRAN, GERAN, CDMA2000,NULLUnit: NoneActual Value Range: UTRAN, GERAN, CDMA2000,NULLDefault Value: GERAN



215

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

TDLOFD-001073




216

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellOpHoCfg

InterRatSecondPri




Meaning: Indicates the medium-priority target RATfor handovers. It is GERAN by default. If thisparameter is set to UTRAN, GERAN, or CDMA2000,the medium-priority target RAT is UTRAN, GERAN,or CDMA2000, respectively. If this parameter is set toNULL, no medium-priority target RAT is specifiedand only the highest-priority target RAT can beselected for handovers.GUI Value Range: UTRAN, GERAN, CDMA2000,NULLUnit: NoneActual Value Range: UTRAN, GERAN, CDMA2000,NULLDefault Value: GERAN



217

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description





218

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description


InterRatLowestPri




Meaning:Indicates the lowest-priority RAT for handovers. It isCDMA2000 by default. If this parameter is set toUTRAN, GERAN, or CDMA2000, the lowest-priorityRAT is UTRAN, GERAN, or CDMA2000,respectively. If this parameter is set to NULL, nolowest-priority RAT is specified and only the highest-or medium-priority RAT can be selected forhandovers.

The value CDMA2000 is invalid in the currentversion. Therefore, avoid setting this parameter toCDMA2000.GUI Value Range: UTRAN, GERAN, CDMA2000,NULLUnit: NoneActual Value Range: UTRAN, GERAN, CDMA2000,NULLDefault Value: CDMA2000



219

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

TDLOFD-001073




220

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellOpHoCfg

InterRatLowestPri




Meaning: Indicates the lowest-priority target RAT forhandovers. It is CDMA2000 by default. If thisparameter is set to UTRAN, GERAN, or CDMA2000,the lowest-priority target RAT is UTRAN, GERAN,or CDMA2000, respectively. If this parameter is set toNULL, no lowest-priority target RAT is specified andonly the highest- or medium-priority target RAT canbe selected for handovers.GUI Value Range: UTRAN, GERAN, CDMA2000,NULLUnit: NoneActual Value Range: UTRAN, GERAN, CDMA2000,NULLDefault Value: CDMA2000



221

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description





222

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

UtranNFreq

CsPsMixedPriority


LOFD-001088 /TDLOFD-001088LOFD-001019 /TDLOFD-001019TDLOFD-001033TDLOFD-001052TDLOFD-001078

CSFallbackSteeringtoUTRANPS Inter-RATMobilitybetweenE-UTRANandUTRANCSFallbacktoUTRANFlashCSFallbacktoUTRANE-UTRANtoUTRANCS/PSsteering

Meaning: Indicates the priority for the neighboringUTRAN frequency to carry CS+PS combinedservices. In measurement-based CSFB to UTRAN, ifUtranCsfbSteeringSwitch and UtranFreqLayerMeasS-witch are turned on, the eNodeB determines theUTRAN frequency to be delivered to a UE inRRC_CONNECTED mode based on the priorityspecified by this parameter. The eNodeBpreferentially delivers the UTRAN frequency with thehighest CS+PS combined service priority to the UE.In blind CSFB to UTRAN, if UtranCsfbSteeringS-witch and UtranFreqLayerBlindSwitch are turned on,the target cell is selected based on the priorityspecified by this parameter. The cell on the UTRANfrequency with the highest priority is preferentiallyselected. If this parameter is set to Priority_0, theUTRAN frequency is not included in priorityarrangement for neighboring UTRAN frequencies tocarry CS+PS combined services.GUI Value Range: Priority_0(Priority 0),Priority_1(Priority 1), Priority_2(Priority 2),Priority_3(Priority 3), Priority_4(Priority 4),Priority_5(Priority 5), Priority_6(Priority 6),Priority_7(Priority 7), Priority_8(Priority 8),Priority_9(Priority 9), Priority_10(Priority 10),Priority_11(Priority 11), Priority_12(Priority 12),Priority_13(Priority 13), Priority_14(Priority 14),Priority_15(Priority 15), Priority_16(Priority 16)Unit: NoneActual Value Range: Priority_0, Priority_1,Priority_2, Priority_3, Priority_4, Priority_5,Priority_6, Priority_7, Priority_8, Priority_9,Priority_10, Priority_11, Priority_12, Priority_13,Priority_14, Priority_15, Priority_16Default Value: Priority_2(Priority 2)



223

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CSFallBackPolicyCfg

CsfbHoPolicyCfg


LOFD-001033 /TDLOFD-001033LOFD-001034 /TDLOFD-001034LOFD-001088 /TDLOFD-001088LOFD-001089 /TDLOFD-001089

CSFallbacktoUTRANCSFallbacktoGERANCSFallbackSteeringtoUTRANCSFallbackSteeringtoGERAN

Meaning: Indicates the CSFB policy for a UE inconnected mode. If the CSFB steering function isdisabled, this parameter also applies to UEs in idlemode. The policy can be PS handover, CCO, orredirection.GUI Value Range: REDIRECTION, CCO_HO,PS_HOUnit: NoneActual Value Range: REDIRECTION, CCO_HO,PS_HODefault Value: REDIRECTION:On, CCO_HO:On,PS_HO:On

CSFallBackHo

CsfbHoUtranB1ThdRscp

MODCSFALLBACKHOLSTCSFALLBACKHO

LOFD-001033 /TDLOFD-001033

CSFallbacktoUTRAN

Meaning: Indicates the RSCP threshold for event B1,which is used in CS fallback to UTRAN. When CSfallback to UTRAN is applicable, this parameter is setfor UEs and used in the evaluation about whether totrigger event B1. This parameter indicates the RSCPrequirement for the UTRAN cells to be included in themeasurement report. A UE sends a measurementreport related to event B1 to the eNodeB when theRSCP in at least one UTRAN cell exceeds thisthreshold and other triggering conditions are met. Fordetails, see 3GPP TS 36.331.GUI Value Range: -120~-25Unit: dBmActual Value Range: -120~-25Default Value: -106



224

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

InterRatHoComm

InterRatHoUtranB1MeasQuan

MODINTERRATHOCOMMLSTINTERRATHOCOMM

LOFD-001019 /TDLOFD-001019LOFD-001022 /TDLOFD-001022LOFD-001033 /TDLOFD-001033

PS Inter-RATMobilitybetweenE-UTRANandUTRANSRVCCtoUTRANCSFallbacktoUTRAN

Meaning: Indicates the quantity to be measured forhandovers to UTRAN. For details, see 3GPP TS36.331. This parameter applies only to UTRAN FDD.The RSCP values are relatively stable, while theEc/No values fluctuate with the network load. Thevalue BOTH applies only to UEs complying with3GPP Release 10. For UEs complying with 3GPPRelease 8 or 9, the value BOTH is equivalent to thevalue RSCP. QoE-based handover algorithms do notapply to UEs complying with 3GPP Release 8 andRelease 9, and the parameter value is fixed as ECN0.GUI Value Range: RSCP, ECN0, BOTHUnit: NoneActual Value Range: RSCP, ECN0, BOTHDefault Value: ECN0

CSFallBackHo

CsfbHoUtranB1ThdEcn0


LOFD-001033 /TDLOFD-001033

CSFallbacktoUTRAN

Meaning: Indicates the Ec/N0 threshold for event B1,which is used in CS fallback to UTRAN. When CSfallback to UTRAN is required, this parameter is setfor UEs and used in the evaluation about whether totrigger event B1. This parameter indicates the Ec/N0requirement for the UTRAN cells to be included in themeasurement report. A UE sends a measurementreport related to event B1 to the eNodeB when theEc/N0 in at least one UTRAN cell exceeds thisthreshold and other triggering conditions are met. Fora cell with large signal fading variance, set thisparameter to a large value to prevent unnecessaryhandovers. For a cell with small signal fadingvariance, set this parameter to a small value to ensuretimely handovers. For details, see 3GPP TS 36.331.GUI Value Range: -48~0Unit: 0.5dBActual Value Range: -24~0Default Value: -24



225

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CSFallBackHo

CsfbHoUtranTimeToTrig


LOFD-001033 /TDLOFD-001033

CSFallbacktoUTRAN

Meaning: Indicates the time-to-trigger for event B1that is used in CS fallback to UTRAN. When CSfallback to UTRAN is applicable, this parameter is setfor UEs and used in the evaluation of whether totrigger event B1. When detecting that the signalquality in at least one UTRAN cell meets the enteringcondition, the UE does not send a measurement reportto the eNodeB immediately. Instead, the UE sends areport only when the signal quality continuouslymeets the entering condition during the time-to-trigger. This parameter helps decrease the number ofoccasionally triggered event reports, the averagenumber of handovers, and the number of wronghandovers, and thus helps to prevent unnecessaryhandovers. For details, see 3GPP TS 36.331.GUI Value Range: 0ms, 40ms, 64ms, 80ms, 100ms,128ms, 160ms, 256ms, 320ms, 480ms, 512ms, 640ms,1024ms, 1280ms, 2560ms, 5120msUnit: msActual Value Range: 0ms, 40ms, 64ms, 80ms, 100ms,128ms, 160ms, 256ms, 320ms, 480ms, 512ms, 640ms,1024ms, 1280ms, 2560ms, 5120msDefault Value: 40ms



226

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ENodeBAlgoSwitch

HoModeSwitch


LOFD-001022 /TDLOFD-001022LOFD-001023 /TDLOFD-001023LOFD-001033 /TDLOFD-001033LOFD-001034 /TDLOFD-001034LOFD-001019 /TDLOFD-001019LOFD-001020 /TDLOFD-001020LOFD-001021 /TDLOFD-001021TDLOFD-001052TDLOFD-001088TDLOFD-001043

SRVCCtoUTRANSRVCCtoGERANCSFallbacktoUTRANCSFallbacktoGERANPS Inter-RATMobilitybetweenE-UTRANandUTRANPS Inter-RATMobilitybetweenE-UTRANandGERANPS Inter-RATMobilitybetweenE-UTRANandCDMA2000FlashCSFallbacktoUTRANCSFallback

Meaning:Indicates whether to enable or disable different typesof handovers, based on which the eNodeB determineshandover policies.

UtranVoipCapSwitch: If this switch is on, UTRANsupports VoIP. If this switch is off, UTRAN does notsupport VoIP.

Cdma1xRttVoipCapSwitch: If this switch is on,CDMA2000 1xRTT supports VoIP. If this switch isoff, CDMA2000 1xRTT does not support VoIP.

UtranPsHoSwitch: If this switch is on, UTRANsupports PS handovers. If this switch is off, UTRANdoes not support PS handovers.

GeranPsHoSwitch: If this switch is on, GERANsupports PS handovers. If this switch is off, GERANdoes not support PS handovers.

CdmaHrpdNonOptimisedHoSwitch: If this switch ison, non-optimized handovers to CDMA2000 HRPDare enabled. If this switch is off, non-optimizedhandovers to CDMA2000 HRPD are disabled.

CdmaHrpdOptimisedHoSwitch: If this switch isturned on, optimized handovers to CDMA2000 HRPDare enabled. If this switch is off, optimized handoversto CDMA2000 HRPD are disabled.

GeranNaccSwitch: This switch does not take effect ifGeranCcoSwitch is off. If this switch is on, theGERAN supports network assisted cell change(NACC). If this switch is off, the GERAN does notsupport NACC.

GeranCcoSwitch: If this switch is on, the GERANsupports cell change order (CCO). If this switch is off,the GERAN does not support CCO.

UtranSrvccSwitch: If this switch is on, the UTRANsupports SRVCC. If this switch is off, the UTRANdoes not support SRVCC.

GeranSrvccSwitch: If this switch is on, the GERANsupports SRVCC. If this switch is off, the GERANdoes not support SRVCC.

Cdma1xRttSrvccSwitch: If this switch is on, theCDMA2000 1xRTT supports SRVCC. If this switch isoff, the CDMA2000 1xRTT does not support SRVCC.



227

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

TDLOFD-001072TDLOFD-001046TDLOFD-001073

SteeringtoUTRANServicebasedInter-RAThandover toUTRANDistancebasedInter-RAThandover toUTRANServicebasedInter-RAThandover toGERANDistancebasedInter-RAThandover toGERAN

UtranRedirectSwitch: If this switch is on, redirectionto UTRAN is enabled. If this switch is turned off,redirection to UTRAN is disabled.

GeranRedirectSwitch: If this switch is on, redirectionto GERAN is enabled. If this switch is off, redirectionto GERAN is disabled.

CdmaHrpdRedirectSwitch: If this switch is on,redirection to CDMA2000 HRPD is enabled. If thisswitch is off, redirection to CDMA2000 HRPD isdisabled.

Cdma1xRttRedirectSwitch: If this switch is on,redirection to CDMA2000 1xRTT is enabled. If thisswitch is off, redirection to CDMA2000 1xRTT isdisabled.

BlindHoSwitch: If this switch is on, blind handoversfor CSFB are enabled. If this switch is off, blindhandovers for CSFB are disabled. If both this optionand the BlindHoSwitch option of the Handover Modeswitch parameter of the CellHoParaCfg MO areselected, blind CSFB handovers for CSFB areenabled.

LcsSrvccSwitch: If this switch is on, an SRVCCprocedure is triggered when a UE receives a CSFBinstruction during a VoIP service. If this switch is off,an SRVCC procedure is not triggered when a UEreceives a CSFB instruction during a VoIP service.

AutoGapSwitch: If this switch is on and UEs supportautomatic measurement gap configurations on thetarget frequency, the eNodeB does not deliver gapconfigurations to UEs. If this switch is off, theeNodeB delivers gap configurations to UEs during allinter-frequency and inter-RAT measurements.

UeVoipOnHspaCapSwitch: If this switch is on and theeNodeB attempts to hand over UEs using voiceservices to UTRAN, the eNodeB checks UEcapabilities when determining whether PS handover isapplied. UEs must support voiceOverPS-HS-UTRA-FDD-r9 if the target UTRAN cell works in FDD modeor voiceOverPS-HS-UTRA-TDD128-r9 if the targetUTRAN cell works in TDD mode. If this switch is off,the eNodeB does not check UE capabilities whenhanding over UEs to UTRAN based on PS handovers.

UtranFddB1CapSwitch: If this switch is on, thesetting of bit 41 of FGI specifying the UE capability



228

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

of event B1 measurement on FDD UTRAN cells mustbe considered. If this switch is off, the setting of bit 41of FGI does not need to be considered.

CdmaHrpdNonOptMeaHoSwitch: If this switch is on,measurement-based non-optimized handovers toCDMA2000 HRPD are enabled. If this switch is off,measurement-based non-optimized handovers toCDMA2000 HRPD are disabled.

GUI Value Range:UtranVoipCapSwitch(UtranVoipCapSwitch),Cdma1xRttVoipCapSwitch(Cdma1xRttVoipCapSwitch), UtranPsHoSwitch(UtranPsHoSwitch),GeranPsHoSwitch(GeranPsHoSwitch),CdmaHrpdNonOptimisedHoS-witch(CdmaHrpdNonOptimisedHoSwitch),CdmaHrpdOptimisedHoSwitch(CdmaHrpdOptimised-HoSwitch), GeranNaccSwitch(GeranNaccSwitch),GeranCcoSwitch(GeranCcoSwitch),UtranSrvccSwitch(UtranSrvccSwitch),GeranSrvccSwitch(GeranSrvccSwitch),Cdma1xRttSrvccSwitch(Cdma1xRttSrvccSwitch),UtranRedirectSwitch(UtranRedirectSwitch),GeranRedirectSwitch(GeranRedirectSwitch),CdmaHrpdRedirectSwitch(CdmaHrpdRedirectS-witch),Cdma1xRttRedirectSwitch(Cdma1xRttRedirectSwitch), BlindHoSwitch(BlindHoSwitch),LcsSrvccSwitch(LcsSrvccSwitch),AutoGapSwitch(AutoGapSwitch),UeVoipOnHspaCapSwitch(UeVoipOnHspaCapS-witch),UtranFddB1CapSwitch(UtranFddB1CapSwitch),CdmaHrpdNonOptMeaHoS-witch(CdmaHrpdNonOptMeaHoSwitch)

Unit: None

Actual Value Range: UtranVoipCapSwitch,Cdma1xRttVoipCapSwitch, UtranPsHoSwitch,GeranPsHoSwitch, CdmaHrpdNonOptimisedHoS-witch, CdmaHrpdOptimisedHoSwitch,GeranNaccSwitch, GeranCcoSwitch,UtranSrvccSwitch, GeranSrvccSwitch,Cdma1xRttSrvccSwitch, UtranRedirectSwitch,GeranRedirectSwitch, CdmaHrpdRedirectSwitch,Cdma1xRttRedirectSwitch, BlindHoSwitch,LcsSrvccSwitch, AutoGapSwitch,UeVoipOnHspaCapSwitch, UtranFddB1CapSwitch,CdmaHrpdNonOptMeaHoSwitch



229

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

Default Value: UtranVoipCapSwitch:Off,Cdma1xRttVoipCapSwitch:Off,UtranPsHoSwitch:Off, GeranPsHoSwitch:Off,CdmaHrpdNonOptimisedHoSwitch:Off,CdmaHrpdOptimisedHoSwitch:Off,GeranNaccSwitch:Off, GeranCcoSwitch:Off,UtranSrvccSwitch:Off, GeranSrvccSwitch:Off,Cdma1xRttSrvccSwitch:Off,UtranRedirectSwitch:Off, GeranRedirectSwitch:Off,CdmaHrpdRedirectSwitch:Off,Cdma1xRttRedirectSwitch:Off, BlindHoSwitch:Off,LcsSrvccSwitch:Off, AutoGapSwitch:Off,UeVoipOnHspaCapSwitch:Off,UtranFddB1CapSwitch:Off, CdmaHrpdNonOptMea-HoSwitch:Off

CSFallBackHo

BlindHoA1ThdRsrp



FlashCSFallbacktoUTRANFlashCSFallbacktoGERAN

Meaning: Indicates the reference signal receivedpower (RSRP) threshold for event A1 associated withCSFB-triggered adaptive blind handovers. Thisparameter is set for a UE as a triggering condition ofevent A1 measurement related to a CSFB-triggeredadaptive blind handover. This parameter specifies theRSRP threshold of the serving cell above which aCSFB-triggered adaptive blind handover is triggered.If the RSRP value measured by a UE exceeds thisthreshold, the UE submits a measurement reportrelated to event A1.GUI Value Range: -140~-43Unit: dBmActual Value Range: -140~-43Default Value: -80



230

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

UtranNFreq

ConnFreqPriority


LOFD-001019 /TDLOFD-001019TDLBFD-00201803TDLOFD-001022TDLOFD-001033TDLOFD-001052TDLOFD-001043TDLOFD-001072TDLOFD-001078

PS Inter-RATMobilitybetweenE-UTRANandUTRANCellSelection andRe-selectionSRVCCtoUTRANCSFallbacktoUTRANFlashCSFallbacktoUTRANServicebasedInter-RAThandover toUTRANDistancebasedInter-RAThandover toUTRANE-UTRANtoUTRANCS/PSsteering

Meaning: Indicates the frequency priority based onwhich the eNodeB selects a target frequency for blindredirection or contains a frequency in a measurementconfiguration. If a blind redirection is triggered andthe target neighboring cell is not specified, theeNodeB selects a target frequency based on thispriority. If a measurement configuration is to bedelivered, the eNodeB preferentially delivers afrequency with the highest priority. If this priority isset to 0 for a frequency, this frequency is not selectedas the target frequency for a blind redirection. A largervalue indicates a higher priority.GUI Value Range: 0~8Unit: NoneActual Value Range: 0~8Default Value: 0



231

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ENodeBAlgoSwitch

NCellRankingSwitch


LOFD-002002/TDLOFD-002002LOFD-001022/TDLOFD-001022LOFD-001033/TDLOFD-001033LOFD-001052/TDLOFD-001052LOFD-001053/TDLOFD-001053LOFD-001019/TDLOFD-001019LOFD-001043/TDLOFD-001043LOFD-001072/TDLOFD-001072

Inter-RATANRSRVCCtoUTRANCSFallbacktoUTRANFlashCSFallbacktoUTRANFlashCSFallbacktoGERANPS Inter-RATMobilitybetweenE-UTRANandUTRANServicebasedinter-RAThandover toUTRANDistancebasedinter-RAThandover toUTRAN

Meaning: Indicates whether to enable neighboring cellranking. This parameter consists of the followingswitches: GERAN_SWITCH: Indicates whether theeNodeB prioritizes measurement priorities ofneighboring GERAN cells based on the number ofeach neighboring GERAN cell is measured within aperiod of time. The eNodeB prioritizes measurementpriorities only when this switch is on.UTRAN_SWITCH: Indicates whether the eNodeBprioritizes measurement priorities of neighboringUTRAN cells based on the number of eachneighboring UTRAN cell is measured within a periodof time. The eNodeB prioritizes measurementpriorities of neighboring UTRAN cells based on thenumber of each neighboring UTRAN cell is measuredwithin a period of time only when this switch is on.GUI Value Range: GERAN_SWITCH(GERANNeighboring Cell Ranking Switch),UTRAN_SWITCH(UTRAN Neighboring CellRanking Switch)Unit: NoneActual Value Range: GERAN_SWITCH,UTRAN_SWITCHDefault Value: GERAN_SWITCH:Off,UTRAN_SWITCH:Off



232

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

UtranNCell

NCellMeasPriority

ADDUTRANNCELLDSPUTRANEXTENDEDNCELLLSTUTRANNCELL

LOFD-002002/TDLOFD-002002LOFD-001022/TDLOFD-001022LOFD-001033/TDLOFD-001033LOFD-001052/TDLOFD-001052LOFD-001019/TDLOFD-001019LOFD-001043/TDLOFD-001043LOFD-001072/TDLOFD-001072

Inter-RATANRSRVCCtoUTRANCSFallbacktoUTRANFlashCSFallbacktoUTRANPS Inter-RATMobilitybetweenE-UTRANandUTRANServicebasedinter-RAThandover toUTRANDistancebasedinter-RAThandover toUTRAN

Meaning: Indicates the measurement priority of theneighboring UTRAN cell. A larger value indicates ahigher priority. The measurement priorities can beperiodically and automatically arranged based on thenumber of times that each neighboring UTRAN cell ismeasured. The neighboring UTRAN cells for UTRANmeasurement control, UTRAN flash blindredirections, and UTRAN flash-CSFB-basedredirections can be selected based on the measurementpriorities of neighboring UTRAN cells.GUI Value Range: 0~128Unit: NoneActual Value Range: 0~128Default Value: 0



233

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

UtranNCell

CellMeasPriority

ADDUTRANNCELLMODUTRANNCELLLSTUTRANNCELL

LOFD-001019TDLOFD-001022TDLOFD-001033TDLOFD-001052TDLOFD-001019TDLOFD-001043TDLOFD-001072TDLOFD-001078


SRVCCtoUTRAN

CSFallbacktoUTRAN



ServicebasedInter-RAThandover toUTRAN

DistancebasedInter-RAThandover toUTRAN

E-UTRANtoUTRAN

Meaning: Indicates the priority of measurement on theneighboring UTRAN cell. The eNodeB preferentiallycontains the information about a neighboring cell withthis priority set to HIGH_PRIORITY while deliveringa measurement configuration.GUI Value Range: LOW_PRIORITY(Low Priority),HIGH_PRIORITY(High Priority)Unit: NoneActual Value Range: LOW_PRIORITY,HIGH_PRIORITYDefault Value: LOW_PRIORITY(Low Priority)



234

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CS/PSsteering

CellUeMeasControlCfg

MaxUtranTddMeasFreqNum

MODCELLUEMEASCONTROLCFGLSTCELLUEMEASCONTROLCFG

LOFD-001019 /TDLOFD-001019LOFD-001022 /TDLOFD-001022LOFD-001043 /TDLOFD-001043LOFD-001072 /TDLOFD-001072LOFD-001033 /TDLOFD-001033

PS Inter-RATMobilitybetweenE-UTRANandUTRANSRVCCtoUTRANServicebasedInter-RAThandover toUTRANDistancebasedInter-RAThandover toUTRANCSFallbacktoUTRAN

Meaning: Indicates the maximum number of UTRANTDD frequencies that can be contained in themeasurement control messages delivered for UEs inRRC_CONNECTED state.GUI Value Range: 1~16Unit: NoneActual Value Range: 1~16Default Value: 3



235

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

UtranNCell

BlindHoPriority

ADDUTRANNCELLMODUTRANNCELLLSTUTRANNCELL

LOFD-001019TDLOFD-001022TDLOFD-001033TDLOFD-001052TDLOFD-001019TDLOFD-001043TDLOFD-001072TDLOFD-001078


SRVCCtoUTRAN

CSFallbacktoUTRAN



ServicebasedInter-RAThandover toUTRAN

DistancebasedInter-RAThandover toUTRAN

E-UTRANtoUTRAN

Meaning: Indicates the priority of the neighboring cellduring blind handovers. Blind handover is a process inwhich the eNodeB instructs a UE to hand over to aspecified neighboring cell. There are 32 prioritiesaltogether. The priority has a positive correlation withthe value of this parameter. Note that the value 0indicates that blind handovers to the neighboring cellare not allowed.GUI Value Range: 0~32Unit: NoneActual Value Range: 0~32Default Value: 0



236

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CS/PSsteering

CellHoParaCfg

L2UCsfbMRProMode


LOFD-001033 /TDLOFD-001033

CSFallbacktoUTRAN

Meaning:Indicates how measurement reports are handled inmeasurement-based

CSFB to UTRAN. If this parameter is set toHANDOVER_IMMEDIATELY, an

eNodeB immediately performs handover evaluationafter receiving a

measurement report for CSFB to UTRAN. If thisparameter is set to

BASED_ON_SIGNAL_STRENGTH, the eNodeBtransfers the UE to the strongest

cell. If this parameter is set toBASED_ON_FREQ_PRIORITY, the eNodeB

hands over the UE to a cell on a frequency with apriority as high

as possible.GUI Value Range:HANDOVER_IMMEDIATELY(HANDOVER_IMMEDIATELY),BASED_ON_SIGNAL_STRENGTH(BASED_ON_SIGNAL_STRENGTH),BASED_ON_FREQ_PRIORITY(BASED_ON_FREQ_PRIORITY)Unit: NoneActual Value Range: HANDOVER_IMMEDIATELY,BASED_ON_SIGNAL_STRENGTH,BASED_ON_FREQ_PRIORITYDefault Value:HANDOVER_IMMEDIATELY(HANDOVER_IMMEDIATELY)

CellHoParaCfg

CsfbMRWaitingTimer


LOFD-001033 /TDLOFD-001033

CSFallbacktoUTRAN

Meaning: Indicates the length of the timer that theeNodeB waits for the next measurement report afterreceiving the first measurement report formeasurement-based CSFB to UTRAN.GUI Value Range: 60~1000Unit: msActual Value Range: 60~1000Default Value: 100



237

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

InterRatHoComm

CellInfoMaxUtranCellNum


LOFD-001019 /TDLOFD-001019TDLOFD-001052

PS Inter-RATMobilitybetweenE-UTRANandUTRANFlashCSFallbacktoUTRAN

Meaning: Indicates the maximum number of UTRANcell system information messages that can betransmitted during a flash redirection procedure.GUI Value Range: 1~16Unit: NoneActual Value Range: 1~16Default Value: 8

CSFallBackHo

CsfbProtectionTimer



CSFallbacktoUTRANCSFallbacktoGERANEnhanced CSFallbacktoCDMA20001xRTT

Meaning: Indicates the timer governing the period inwhich only CSFB can be performed . After the timerexpires, the eNodeB performs a blind redirection forthe UE.GUI Value Range: 1~10Unit: sActual Value Range: 1~10Default Value: 4

InterRatHoComm

UtranCellNumForEmcRedirect



CSFallbacktoUTRANFlashCSFallbacktoUTRAN

Meaning: Indicates the maximum number of UTRANcell system information messages that can betransmitted during a CSFB emergency redirectionprocedure.GUI Value Range: 0~16Unit: NoneActual Value Range: 0~16Default Value: 0



238

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

GlobalProcSwitch

ProtocolMsgOptSwitch


LOFD-001022/TDLOFD-001022LOFD-001023/TDLOFD-001023LOFD-081283/TDLOFD-081203LOFD-001053/TDLOFD-001053LOFD-001020/TDLOFD-001020

SRVCCtoUTRANSRVCCtoGERANUltra-FlashCSFB toGERANFlashCSFallbacktoGERANPS Inter-RATMobilitybetweenE-UTRANandGERAN

Meaning:Indicates whether to optimize protocol messages sentby the eNodeB. This parameter includes the followingoptions:

RrcSetupOptSwitch: If this option is selected, theoptimization of RRCConnectionSetup messages isenabled. In this case, IEs with protocol-defined defaultvalues are no longer included in theRRCConnectionSetup message. For details about theprotocol-defined default settings, see 3GPP TS36.331.

IucsRrcRecfgMcCombSwitch: If this option isselected, the eNodeB includes the radio resourceconfiguration and measurement configuration for aUE in one RRCConnectionReconfiguration messageduring initial access.

RcrpRrcRecfgMcCombSwitch: If this option isselected, the eNodeB includes the radio resourceconfiguration and measurement configuration for aUE in one RRCConnectionReconfiguration messageduring RRC connection reestablishment. The optionwill not take effect on the interaction of RRCconnection reestablishment and other signalingprocedures.

RrcRecfgMcOptSwitch: If this option is selected, thecell measurement configurations with the CIO of 0(indicated by cellIndividualOffset) are no longerincluded in the measurement configurations deliveredto UEs.

IdleCsfbRedirectOptSwitch: If this option is selectedand the preferred CSFB policy for UEs in idle mode isredirection, the eNodeB no longer activates securitymode or performs RRC connection reconfiguration,but sends a redirection message.

UlNasBufferSwitch: If this option is selected, theeNodeB buffers uplink NAS messages sent by the UEbefore the UE-associated logical S1 connection isavailable and sends these messages after the UE-associated logical S1 connection is available. If thisoption is deselected, the eNodeB releases this UE afterthe procedures finish.

IratMeasCfgTransSwitch: If this option is selected, theHandover Required message that the eNodeB sends to



239

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

a BSC contains the IE IRAT MeasurementConfiguration.

GeranAnrMcOptSwitch: This option controls whethermeasurement configuration optimization takes effectwhen ANR with GERAN is enabled. If this option isdeselected, the optimization does not take effect. Thatis, when an eNodeB delivers measurementconfiguration to UEs to perform CGI reading for ANRwith GERAN, the carrierFreqs IE can contain multipleGERAN frequencies. If this option is selected, theoptimization takes effect, and the carrierFreqs IEcontains only one GERAN frequency.

InactDiscardSwitch: This option specifies whether toterminate the ongoing signaling flow when the UEinactivity timer expires. If this option is deselected,the ongoing flow is terminated and the eNodeBdirectly releases the UE. If this option is selected, theongoing flow is not terminated and the timer isrestarted.

SRVCCHoBasedUeCapSwitch: If this option isselected, the eNodeB determines whether to trigger anSRVCC based only on UE's SRVCC capabilities, notthe SRVCCOperationPossible IE that the MME sendsto the eNodeB. If this option is deselected, theeNodeB determines whether to trigger an SRVCC-based handover based on the SRVCCOperationPossi-ble IE that the MME sends to the eNodeB.

L2GPLMNChooseOptSwitch: This option specifieswhether to enable target PLMN ID optimization forhandovers to GERAN. If this option is selected, theeNodeB takes the NCL-defined PLMN IDs andincludes them in the handover request messages orRIM request messages. If this option is deselected, theoptimization is not activated.

HoInRrcRecfgMcCombSwitch: If this option isselected, after a UE is handed over to a cell, the celldelivers the radio resource configuration andmeasurement configuration in a single RRCConnection Reconfiguration message to the UEduring the resource reconfiguration procedure.GUI Value Range: RrcSetupOptSwitch,IucsRrcRecfgMcCombSwitch,RcrpRrcRecfgMcCombSwitch,RrcRecfgMcOptSwitch, IdleCsfbRedirectOptSwitch,UlNasBufferSwitch, IratMeasCfgTransSwitch,



240

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

GeranAnrMcOptSwitch, InactDiscardSwitch,SRVCCHoBasedUeCapSwitch,L2GPLMNChooseOptSwitch,HoInRrcRecfgMcCombSwitch,UeCapEnquiryCombSwitch, UeTraceOptSwitchUnit: NoneActual Value Range: RrcSetupOptSwitch,IucsRrcRecfgMcCombSwitch,RcrpRrcRecfgMcCombSwitch,RrcRecfgMcOptSwitch, IdleCsfbRedirectOptSwitch,UlNasBufferSwitch, IratMeasCfgTransSwitch,GeranAnrMcOptSwitch, InactDiscardSwitch,SRVCCHoBasedUeCapSwitch,L2GPLMNChooseOptSwitch,HoInRrcRecfgMcCombSwitch,UeCapEnquiryCombSwitch, UeTraceOptSwitchDefault Value: RrcSetupOptSwitch:Off,IucsRrcRecfgMcCombSwitch:Off,RcrpRrcRecfgMcCombSwitch:Off,RrcRecfgMcOptSwitch:Off, IdleCsfbRedirectOptS-witch:Off, UlNasBufferSwitch:Off,IratMeasCfgTransSwitch:Off,GeranAnrMcOptSwitch:Off, InactDiscardSwitch:Off,SRVCCHoBasedUeCapSwitch:Off,L2GPLMNChooseOptSwitch:Off,HoInRrcRecfgMcCombSwitch:Off,UeCapEnquiryCombSwitch:Off,UeTraceOptSwitch:Off



241

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

eNBRsvdPara

RsvdSwPara1

MODENBRSVDPARALSTENBRSVDPARA

None None Meaning:Indicates reserved 32-bit switch parameter 1 that isreserved for future requirements.

Note on parameter replacement: Reserved parametersare temporarily used in patch versions and will bereplaced with new parameters. For example, the ID ofa new parameter can signify the parameter function.Therefore, avoid using this parameter.GUI Value Range:RsvdSwPara1_bit1(ReservedSwitchParameter1_bit1),RsvdSwPara1_bit2(ReservedSwitchParameter1_bit2),RsvdSwPara1_bit3(ReservedSwitchParameter1_bit3),RsvdSwPara1_bit4(ReservedSwitchParameter1_bit4),RsvdSwPara1_bit5(ReservedSwitchParameter1_bit5),RsvdSwPara1_bit6(ReservedSwitchParameter1_bit6),RsvdSwPara1_bit7(ReservedSwitchParameter1_bit7),RsvdSwPara1_bit8(ReservedSwitchParameter1_bit8),RsvdSwPara1_bit9(ReservedSwitchParameter1_bit9),RsvdSwPara1_bit10(ReservedSwitchParame-ter1_bit10),RsvdSwPara1_bit11(ReservedSwitchParame-ter1_bit11),RsvdSwPara1_bit12(ReservedSwitchParame-ter1_bit12),RsvdSwPara1_bit13(ReservedSwitchParame-ter1_bit13),RsvdSwPara1_bit14(ReservedSwitchParame-ter1_bit14),RsvdSwPara1_bit15(ReservedSwitchParame-ter1_bit15),RsvdSwPara1_bit16(ReservedSwitchParame-ter1_bit16),RsvdSwPara1_bit17(ReservedSwitchParame-ter1_bit17),RsvdSwPara1_bit18(ReservedSwitchParame-ter1_bit18),RsvdSwPara1_bit19(ReservedSwitchParame-ter1_bit19),RsvdSwPara1_bit20(ReservedSwitchParame-ter1_bit20),RsvdSwPara1_bit21(ReservedSwitchParame-ter1_bit21),RsvdSwPara1_bit22(ReservedSwitchParame-ter1_bit22),RsvdSwPara1_bit23(ReservedSwitchParame-ter1_bit23),RsvdSwPara1_bit24(ReservedSwitchParame-



242

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ter1_bit24),RsvdSwPara1_bit25(ReservedSwitchParame-ter1_bit25),RsvdSwPara1_bit26(ReservedSwitchParame-ter1_bit26),RsvdSwPara1_bit27(ReservedSwitchParame-ter1_bit27),RsvdSwPara1_bit28(ReservedSwitchParame-ter1_bit28),RsvdSwPara1_bit29(ReservedSwitchParame-ter1_bit29),RsvdSwPara1_bit30(ReservedSwitchParame-ter1_bit30),RsvdSwPara1_bit31(ReservedSwitchParame-ter1_bit31),RsvdSwPara1_bit32(ReservedSwitchParame-ter1_bit32)Unit: NoneActual Value Range: RsvdSwPara1_bit1,RsvdSwPara1_bit2, RsvdSwPara1_bit3,RsvdSwPara1_bit4, RsvdSwPara1_bit5,RsvdSwPara1_bit6, RsvdSwPara1_bit7,RsvdSwPara1_bit8, RsvdSwPara1_bit9,RsvdSwPara1_bit10, RsvdSwPara1_bit11,RsvdSwPara1_bit12, RsvdSwPara1_bit13,RsvdSwPara1_bit14, RsvdSwPara1_bit15,RsvdSwPara1_bit16, RsvdSwPara1_bit17,RsvdSwPara1_bit18, RsvdSwPara1_bit19,RsvdSwPara1_bit20, RsvdSwPara1_bit21,RsvdSwPara1_bit22, RsvdSwPara1_bit23,RsvdSwPara1_bit24, RsvdSwPara1_bit25,RsvdSwPara1_bit26, RsvdSwPara1_bit27,RsvdSwPara1_bit28, RsvdSwPara1_bit29,RsvdSwPara1_bit30, RsvdSwPara1_bit31,RsvdSwPara1_bit32Default Value: RsvdSwPara1_bit1:Off,RsvdSwPara1_bit2:Off, RsvdSwPara1_bit3:Off,RsvdSwPara1_bit4:Off, RsvdSwPara1_bit5:Off,RsvdSwPara1_bit6:Off, RsvdSwPara1_bit7:Off,RsvdSwPara1_bit8:Off, RsvdSwPara1_bit9:Off,RsvdSwPara1_bit10:Off, RsvdSwPara1_bit11:Off,RsvdSwPara1_bit12:Off, RsvdSwPara1_bit13:Off,RsvdSwPara1_bit14:Off, RsvdSwPara1_bit15:Off,RsvdSwPara1_bit16:Off, RsvdSwPara1_bit17:Off,RsvdSwPara1_bit18:Off, RsvdSwPara1_bit19:Off,RsvdSwPara1_bit20:Off, RsvdSwPara1_bit21:Off,RsvdSwPara1_bit22:Off, RsvdSwPara1_bit23:Off,RsvdSwPara1_bit24:Off, RsvdSwPara1_bit25:Off,



243

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

RsvdSwPara1_bit26:Off, RsvdSwPara1_bit27:Off,RsvdSwPara1_bit28:Off, RsvdSwPara1_bit29:Off,RsvdSwPara1_bit30:Off, RsvdSwPara1_bit31:Off,RsvdSwPara1_bit32:Off

CSFallBackPolicyCfg

CsfbUserArpCfgSwitch


LBFD-002023 /TDLBFD-002023

AdmissionControl

Meaning: Indicates whether allocation/retentionpriorities (ARPs) can be configured for CSFB servicestriggered by common calls. For details about ARPs,see 3GPP TS 23.401.GUI Value Range: OFF(Off), ON(On)Unit: NoneActual Value Range: OFF, ONDefault Value: OFF(Off)

CSFallBackPolicyCfg

NormalCsfbUserArp


LBFD-002023 /TDLBFD-002023

AdmissionControl

Meaning: Indicates the allocation/retention priority(ARP) of a CSFB service triggered by a common call.When this parameter is set to 1, the service priority isthe same as that of an emergency call. For detailsabout the ARP, see 3GPP TS 23.401.GUI Value Range: 1~15Unit: NoneActual Value Range: 1~15Default Value: 2

GlobalProcSwitch

UtranLoadTransChan


None None Meaning: Indicates the UMTS load transmissionchannel. The eNodeB sends RAN-INFORMATION-REQUEST PDUs to UTRAN cells to request multiplereports on the load status of UTRAN cells only whenthe parameter is set to BASED_ON_RIM.Thefunction specified by the parameter valueBASED_ON_ECO is temporarily unavailable.GUI Value Range: NULL, BASED_ON_RIM,BASED_ON_ECOUnit: NoneActual Value Range: NULL, BASED_ON_RIM,BASED_ON_ECODefault Value: NULL



244

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ENodeBAlgoSwitch

RimOnEcoSwitch


MRFD-090211LOFD-001052/TDLOFD-001052LOFD-001019/TDLOFD-001019LOFD-001044/TDLOFD-001044LOFD-001033/TDLOFD-001033

eCoordinatorbasedRIMprocessoptimizationFlashCSFallbacktoUTRANPS Inter-RATMobilitybetweenE-UTRANandUTRANInter-RATLoadSharingtoUTRAN(basedonUMTScell loadinformation)CSFallbacktoUTRAN

Meaning: Indicates whether the RAN informationmanagement (RIM) procedure is initiated by theeCoordinator. If this parameter is set to ON, the RIMprocedure is initiated by the eCoordinator. If thisparameter is set to OFF, the RIM procedure is initiatedby the core network.GUI Value Range: OFF(Off), ON(On)Unit: NoneActual Value Range: OFF, ONDefault Value: OFF(Off)



245

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ENodeBAlgoSwitch

RimSwitch



CSFallbacktoGERANFlashCSFallbacktoUTRANFlashCSFallbacktoGERAN

Meaning: Indicates the collective switch for the RANinformation management (RIM) function.UTRAN_RIM_SWITCH: Indicates the switch used toenable or disable the RIM procedure that requestsevent-driven multiple reports from UTRAN cells. Ifthis switch is on, the eNodeB can send RAN-INFORMATION-REQUEST protocol data units(PDUs) to UTRAN cells to request multiple event-driven reports. If this switch is off, the eNodeB cannotsend RAN-INFORMATION-REQUEST PDUs toUTRAN cells to request multiple event-driven reports.GERAN_RIM_SWITCH: Indicates the switch used toenable or disable the RIM procedure that requestsevent-driven multiple reports from GERAN cells. Ifthis switch is on, the eNodeB can send RAN-INFORMATION-REQUEST PDUs to CERAN cellsto request multiple event-driven reports. If this switchis off, the eNodeB cannot send RAN-INFORMATION-REQUEST PDUs to GERAN cellsto request multiple event-driven reports.GUI Value Range: UTRAN_RIM_SWITCH(UTRANRIM Switch), GERAN_RIM_SWITCH(GERAN RIMSwitch)Unit: NoneActual Value Range: UTRAN_RIM_SWITCH,GERAN_RIM_SWITCHDefault Value: UTRAN_RIM_SWITCH:Off,GERAN_RIM_SWITCH:Off



246

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

ENodeBAlgoSwitch

MultiOpCtrlSwitch


LOFD-001022LOFD-001087LOFD-001033LOFD-001052LOFD-001068LOFD-001088LOFD-001019LOFD-001043LOFD-001072LOFD-001078

SRVCCtoUTRANSRVCCFlexibleSteeringtoUTRANCSFallbacktoUTRANFlashCSFallbacktoUTRANCSFallbackwithLAI toUTRANCSFallbackSteeringtoUTRANPS Inter-RATMobilitybetweenE-UTRANandUTRANServicebasedinter-RATDistancebasedInter-RAThandover toUTRAN

Meaning: Indicates the switch used to control whetheroperators can adopt different policies. This parameteris a bit-filed-type parameter. By specifying the bitfields under this parameter, operators can adoptdifferent policies on the corresponding RAT. Thisparameter applies only to LTE FDD.UtranSepOpMobilitySwitch is a switch used tocontrol whether operators can adopt different mobilitypolicies on their UTRANs. If this switch is on,operators can adopt different policies (such as PShandover capability and RIM-based systeminformation reading capability) on their UTRANs. Ifthis switch is off, operators cannot adopt differentpolicies on their UTRANs.GUI Value Range: UtranSepOpMobility-Switch(UtranSepOpMobilitySwitch)Unit: NoneActual Value Range: UtranSepOpMobilitySwitchDefault Value: UtranSepOpMobilitySwitch:Off



247

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

E-UTRANtoUTRANCS/PSSteering



248

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

UtranNetworkCapCfg

NetworkCapCfg

ADDUTRANNETWORKCAPCFGMODUTRANNETWORKCAPCFGLSTUTRANNETWORKCAPCFG


SRVCCtoUTRANCSFallbacktoUTRANFlashCSFallbacktoUTRANCSFallbackwithLAI toUTRANCSFallbackSteeringtoUTRANPS Inter-RATMobilitybetweenE-UTRANandUTRANServicebasedinter-RAThandover toUTRANDistancebasedInter-RAThandover toUTRANUltra-Flash

Meaning:Indicates the UTRAN capabilities for an operatorincluding the PS handover capability, capability ofobtaining system information (SI) of the UTRANthrough RAN information management (RIM)procedures, VoIP capability, ultra-flash CSFBcapability, and SRVCC capability. If the MME,SGSN, MSC, or RNC of the operator does not supportPS handover, RIM procedures, VoIP, ultra-flashCSFB, or SRVCC, set this parameter to indicate theincapabilities. If this parameter is not set, UTRANcapabilities are supported by default. This parameterapplies only to LTE FDD.

PsHoCapCfg: Indicates whether PS handover issupported by the operator in the UTRAN. Thiscapability is supported only if this option is selected.

SiByRimCapCfg: Indicates whether SI of the UTRANcan be obtained through RIM procedures. Thiscapability is supported only if this option is selected.

VoipCapCfg: Indicates whether VoIP is supported bythe operator in the UTRAN. Only if this option isselected, this capability is supported and the eNodeBcan transfer voice services to the UTRAN through PShandover to establish VoIP services.

UltraFlashCsfbCapCfg: Indicates whether SRVCC-based CSFB is supported by the operator in theUTRAN. This capability is supported only if thisoption is selected.

SrvccCapCfg: Indicates whether SRVCC is supportedby the operator in the UTRAN. This capability issupported only if this option is selected. UsingSRVCC, voice services can be handed over to theUTRAN.GUI Value Range: PsHoCapCfg(PsHoCapCfg),SiByRimCapCfg(SiByRimCapCfg),VoipCapCfg(VoipCapCfg),UltraFlashCsfbCapCfg(UltraFlashCsfbCapCfg),SrvccCapCfg(SrvccCapCfg)Unit: NoneActual Value Range: PsHoCapCfg, SiByRimCapCfg,VoipCapCfg, UltraFlashCsfbCapCfg, SrvccCapCfgDefault Value: PsHoCapCfg:Off,SiByRimCapCfg:Off, VoipCapCfg:On,UltraFlashCsfbCapCfg:Off, SrvccCapCfg:On



249

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

LOFD-070202 /TDLOFD-081223

CSFB toGERANUltra-FlashCSFB toUTRAN

GeranNfreqGroup

ConnFreqPriority

ADDGERANNFREQGROUPMODGERANNFREQGROUPLSTGERANNFREQGROUP


PS Inter-RATMobilitybetweenE-UTRANandGERANSRVCCtoGERANCSFallbacktoGERANFlashCSFallbacktoGERAN

Meaning: Indicates the frequency group priority basedon which the eNodeB selects a target frequency groupfor blind redirection or delivers a frequency group inmeasurement configuration messages. If a blindredirection is triggered and the target neighboring cellis not specified, the eNodeB selects a target frequencygroup based on the setting of this parameter. If ameasurement configuration is to be delivered, theeNodeB preferentially delivers the frequency groupwith the highest priority. If this parameter is set to 0for a frequency group, this frequency group is notselected as the target frequency group for a blindredirection. A larger value indicates a higher priority.GUI Value Range: 0~8Unit: NoneActual Value Range: 0~8Default Value: 0



250

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

GeranNcell

BlindHoPriority

ADDGERANNCELLMODGERANNCELLLSTGERANNCELL


PS Inter-RATMobilitybetweenE-UTRANandGERANSRVCCtoGERANCSFallbacktoGERANFlashCSFallbacktoGERAN

Meaning: Indicates the priority of the neighboring cellduring blind handovers. Blind handover is a process inwhich the eNodeB instructs a UE to hand over to aspecified neighboring cell. There are 32 prioritiesaltogether. The priority has a positive correlation withthe value of this parameter. Note that the value 0indicates that blind handovers to the neighboring cellare not allowed.GUI Value Range: 0~32Unit: NoneActual Value Range: 0~32Default Value: 0

InterRatHoComm

CellInfoMaxGeranCellNum



PS Inter-RATMobilitybetweenE-UTRANandGERANFlashCSFallbacktoGERAN

Meaning: Indicates the maximum number of GERANcell system information messages that can betransmitted during a flash redirection procedure.GUI Value Range: 1~32Unit: NoneActual Value Range: 1~32Default Value: 8



251

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

GeranExternalCell

UltraFlashCsfbInd

ADDGERANEXTERNALCELLMODGERANEXTERNALCELLLSTGERANEXTERNALCELL

LOFD-081283 /TDLOFD-081203


Meaning: Indicates whether an external GERAN cellsupports ultra-flash CSFB to GERAN. If thisparameter is set to BOOLEAN_TRUE, the externalGERAN cell supports ultra-flash CSFB to GERAN. Ifthis parameter is set to BOOLEAN_FALSE, theexternal GERAN cell does not support ultra-flashCSFB to GERAN.GUI Value Range: BOOLEAN_FALSE(False),BOOLEAN_TRUE(True)Unit: NoneActual Value Range: BOOLEAN_FALSE,BOOLEAN_TRUEDefault Value: BOOLEAN_TRUE(True)

CellDrxPara

DrxForMeasSwitch

MODCELLDRXPARALSTCELLDRXPARA

LOFD-081283 /TDLOFD-081203

Ultra-FlashCSFallbacktoGERAN

Meaning: Indicates whether to deliver measurement-dedicated DRX parameters to a UE when GERANmeasurements are triggered for CSFB of the UE. Ifthis parameter is set to ON, the eNodeB delivers bothDRX parameters and gap-assisted GERANmeasurement configurations to the UE. If thisparameter is set to OFF, the eNodeB delivers onlygap-assisted GERAN measurement configurations tothe UE.GUI Value Range: OFF(Off), ON(On)Unit: NoneActual Value Range: OFF, ONDefault Value: OFF(Off)

InterRatHoComm

GeranCellNumForEmcRedirect


LOFD-001034 /TDLOFD-001034

CSFallbacktoGERAN

Meaning: Indicates the maximum number of GERANcell system information messages that can betransmitted during a CSFB emergency redirectionprocedure.GUI Value Range: 0~32Unit: NoneActual Value Range: 0~32Default Value: 0



252

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

UtranExternalCell

Rac ADDUTRANEXTERNALCELLMODUTRANEXTERNALCELLLSTUTRANEXTERNALCELL

LOFD-001019 /TDLOFD-001019LOFD-001034 /TDLOFD-001034LOFD-001052 /TDLOFD-001052TDLOFD-001033TDLOFD-001043TDLOFD-001072TDLOFD-001078

PS Inter-RATMobilitybetweenE-UTRANandUTRANCSFallbacktoGERANFlashCSFallbacktoUTRANCSFallbacktoUTRANServicebasedInter-RAThandover toUTRANDistancebasedInter-RAThandover toUTRANE-UTRANtoUTRANCS/PSsteering

Meaning: Indicates the routing area code.GUI Value Range: 0~255Unit: NoneActual Value Range: 0~255Default Value: 0



253

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellOpHoCfg

CnOperatorId

ADDCELLOPHOCFGLSTCELLOPHOCFGMODCELLOPHOCFGRMVCELLOPHOCFG

None None Meaning: Indicates the index of the operator.GUI Value Range: 0~5Unit: NoneActual Value Range: 0~5Default Value: None


UtranLcsCap


LOFD-001033 /TDLOFD-001033

CSFallbacktoUTRAN

Meaning: Indicates the LCS capability of theUTRAN. If this parameter is set to ON, the UTRANsupports LCS. If this parameter is set to OFF, theUTRAN does not support LCS.GUI Value Range: OFF(Off), ON(On)Unit: NoneActual Value Range: OFF, ONDefault Value: OFF(Off)

CellOpHoCfg

LocalCellId

ADDCELLOPHOCFGLSTCELLOPHOCFGMODCELLOPHOCFGRMVCELLOPHOCFG

None None Meaning: Indicates the local identity of the cell. Ituniquely identifies a cell within an eNodeB.GUI Value Range: 0~255Unit: NoneActual Value Range: 0~255Default Value: None



254

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description


UtranCsfbBlindRedirRrSw


LOFD-001033/TDLOFD-001033LOFD-001052/TDLOFD-001052

CSFallbacktoUTRANFlashCSFallbacktoUTRAN

Meaning: Indicates whether the eNodeB selects thetarget frequency in a round robin (RR) manner fromfrequencies with the same priority in blindredirections for CSFB to UTRAN. If this parameter isset to ON(On), the function of target frequencyselection in an RR manner is enabled. If thisparameter is set to OFF(Off), this function is disabled.GUI Value Range: OFF(OFF), ON(ON)Unit: NoneActual Value Range: OFF, ONDefault Value: OFF(OFF)

GlobalProcSwitch

CsfbFlowOptSwitch


LOFD-001033/TDLOFD-001033LOFD-001052/TDLOFD-001052LOFD-070202/TDLOFD-081223

CSFallbacktoUTRANFlashCSFallbacktoUTRANUltra-FlashCSFB toUTRAN

Meaning:Indicates whether to enable CSFB procedureoptimization. This parameter provides the followingoption:

UTRAN_CSFB_FREQ_CHOOSE_OPT_SW: Thisoption specifies whether to optimize target frequencyselection for CSFB to UTRAN if there are severaltarget frequencies with the same priority. If this optionis selected, a UE selects the target frequencyrandomly. If this option is deselected, thisoptimization function is disabled.GUI Value Range:UTRAN_CSFB_FREQ_CHOOSE_OPT_SW(UTRAN CSFB Freq Choose Opt Sw)Unit: NoneActual Value Range:UTRAN_CSFB_FREQ_CHOOSE_OPT_SWDefault Value:UTRAN_CSFB_FREQ_CHOOSE_OPT_SW:Off



255

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CnOperator

CnOperatorId

ADDCNOPERATORLSTCNOPERATORMODCNOPERATORRMVCNOPERATOR

LOFD-001036LOFD-001037LOFD-001086TDLOFD-001112LOFD-070206

RANSharingwithCommonCarrierRANSharingwithDedicatedCarrierRANSharingby MoreOperatorsMOCNFlexiblePriorityBasedCampingHybridRANSharing

Meaning: Indicates the index of the operator.GUI Value Range: 0~5Unit: NoneActual Value Range: 0~5Default Value: None

CSFallBackHo

LocalCellId

LSTCSFALLBACKHOMODCSFALLBACKHO

None None Meaning: Indicates the local ID of the cell. It uniquelyidentifies a cell within a BS.GUI Value Range: 0~255Unit: NoneActual Value Range: 0~255Default Value: None



256

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

S1Interface

MmeRelease

ADDS1INTERFACEMODS1INTERFACEDSPS1INTERFACE

LBFD-00300101/TDLBFD-00300101LBFD-00300102/TDLBFD-00300102LBFD-00300103/TDLBFD-00300103

StarTopologyChainTopologyTreeTopology

Meaning: Indicates the compliance protocol release ofthe MME to which the eNodeB is connected throughthe S1 interface. The eNodeB sends S1 messagescomplying with the protocol release specified by thisparameter. The value of this parameter must be thesame as the MME-complied protocol release. If theparameter value is different from the MME-compliedprotocol release, the way in which the MME handlesthese message is subject to the MME implementation.GUI Value Range: Release_R8(Release 8),Release_R9(Release 9), Release_R10(Release 10),Release_R11(Release 11), Release_R12(Release 12)Unit: NoneActual Value Range: Release_R8, Release_R9,Release_R10, Release_R11, Release_R12Default Value: Release_R8(Release 8)



257

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description


CnOperatorId

LSTCSFALLBACKBLINDHOCFGMODCSFALLBACKBLINDHOCFG

LOFD-001033 /TDLOFD-001033LOFD-001034 /TDLOFD-001034TDLOFD-001052TDLOFD-001053TDLOFD-001035TDLOFD-001090

CSFallbacktoUTRANCSFallbacktoGERANFlashCSFallbacktoUTRANFlashCSFallbacktoGERANCSFallbacktoCDMA20001xRTTEnhanced CSFallbacktoCDMA20001xRTT

Meaning: Indicates the index of the operator.GUI Value Range: 0~5Unit: NoneActual Value Range: 0~5Default Value: None



258

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

GeranExternalCell

Rac ADDGERANEXTERNALCELLMODGERANEXTERNALCELLLSTGERANEXTERNALCELL

LOFD-001034 /LOFD-001034LOFD-001053LOFD-001020 /TDLOFD-001020

CSFallbacktoGERANFlashCSFallbacktoGERANPS Inter-RATMobilitybetweenE-UTRANandGERAN

Meaning: Indicates the routing area code.GUI Value Range: 0~255Unit: NoneActual Value Range: 0~255Default Value: 0


GeranLcsCap


LOFD-001034 /TDLOFD-001034

CSFallbacktoGERAN

Meaning: Indicates the LCS capability of theGERAN. If this parameter is set to ON, the GERANsupports LCS. If this parameter is set to OFF, theGERAN does not support LCS.GUI Value Range: OFF(Off), ON(On)Unit: NoneActual Value Range: OFF, ONDefault Value: OFF(Off)

CSFallBackHo

CsfbHoGeranB1Thd


LOFD-001034 /TDLOFD-001034

CS FallBack toGERAN

Meaning: Indicates the RSSI threshold for event B1that is used in CS fallback to GERAN. A UE sends ameasurement report related to event B1 to the eNodeBwhen the RSSI in at least one GERAN cell exceedsthis threshold and other triggering conditions are met.For details, see 3GPP TS 36.331.GUI Value Range: -110~-48Unit: dBmActual Value Range: -110~-48Default Value: -103



259

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CSFallBackHo

CsfbHoGeranTimeToTrig


LOFD-001034 /TDLOFD-001034

CS FallBack toGERAN

Meaning: Indicates the time-to-trigger for event B1that is used in CS fallback to GERAN. When CSfallback to GERAN is applicable, this parameter is setfor UEs and used in the evaluation of whether totrigger event B1. When detecting that the signalquality in at least one GERAN cell meets the enteringcondition, the UE does not send a measurement reportto the eNodeB immediately. Instead, the UE sends areport only when the signal quality continuouslymeets the entering condition during the time-to-trigger. This parameter helps decrease the number ofoccasionally triggered event reports, the averagenumber of handovers, and the number of wronghandovers, and thus helps to prevent unnecessaryhandovers. For details, see 3GPP TS 36.331.GUI Value Range: 0ms, 40ms, 64ms, 80ms, 100ms,128ms, 160ms, 256ms, 320ms, 480ms, 512ms, 640ms,1024ms, 1280ms, 2560ms, 5120msUnit: msActual Value Range: 0ms, 40ms, 64ms, 80ms, 100ms,128ms, 160ms, 256ms, 320ms, 480ms, 512ms, 640ms,1024ms, 1280ms, 2560ms, 5120msDefault Value: 40ms

CellDrxPara

LongDrxCycleForMeas


LOFD-081283 /TDLOFD-081203


Meaning: Indicates the length of the long DRX cyclededicated to GERAN measurement.GUI Value Range: SF128(128 subframes), SF160(160subframes), SF256(256 subframes), SF320(320subframes), SF512(512 subframes), SF640(640subframes), SF1024(1024 subframes), SF1280(1280subframes), SF2048(2048 subframes), SF2560(2560subframes)Unit: subframeActual Value Range: SF128, SF160, SF256, SF320,SF512, SF640, SF1024, SF1280, SF2048, SF2560Default Value: SF160(160 subframes)



260

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellDrxPara

OnDurTimerForMeas


LOFD-081283 /TDLOFD-081203


Meaning: Indicates the length of the On DurationTimer dedicated to GERAN measurement.GUI Value Range: PSF1(1 PDCCH subframe),PSF2(2 PDCCH subframes), PSF3(3 PDCCHsubframes), PSF4(4 PDCCH subframes), PSF5(5PDCCH subframes), PSF6(6 PDCCH subframes),PSF8(8 PDCCH subframes), PSF10(10 PDCCHsubframes), PSF20(20 PDCCH subframes), PSF30(30PDCCH subframes), PSF40(40 PDCCH subframes),PSF50(50 PDCCH subframes), PSF60(60 PDCCHsubframes), PSF80(80 PDCCH subframes),PSF100(100 PDCCH subframes), PSF200(200PDCCH subframes)Unit: subframeActual Value Range: PSF1, PSF2, PSF3, PSF4, PSF5,PSF6, PSF8, PSF10, PSF20, PSF30, PSF40, PSF50,PSF60, PSF80, PSF100, PSF200Default Value: PSF2(2 PDCCH subframes)

CellDrxPara

DrxInactTimerForMeas


LOFD-081283 /TDLOFD-081203


Meaning: Indicates the length of the DRX InactivityTimer dedicated to GERAN measurement.GUI Value Range: PSF1(1 PDCCH subframe),PSF2(2 PDCCH subframes), PSF3(3 PDCCHsubframes), PSF4(4 PDCCH subframes), PSF5(5PDCCH subframes), PSF6(6 PDCCH subframes),PSF8(8 PDCCH subframes), PSF10(10 PDCCHsubframes), PSF20(20 PDCCH subframes), PSF30(30PDCCH subframes), PSF40(40 PDCCH subframes),PSF50(50 PDCCH subframes), PSF60(60 PDCCHsubframes), PSF80(80 PDCCH subframes),PSF100(100 PDCCH subframes), PSF200(200PDCCH subframes), PSF300(300 PDCCHsubframes), PSF500(500 PDCCH subframes),PSF750(750 PDCCH subframes), PSF1280(1280PDCCH subframes), PSF1920(1920 PDCCHsubframes), PSF2560(2560 PDCCH subframes)Unit: subframeActual Value Range: PSF1, PSF2, PSF3, PSF4, PSF5,PSF6, PSF8, PSF10, PSF20, PSF30, PSF40, PSF50,PSF60, PSF80, PSF100, PSF200, PSF300, PSF500,PSF750, PSF1280, PSF1920, PSF2560Default Value: PSF2(2 PDCCH subframes)



261

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellDrxPara

DrxReTxTimerForMeas


LOFD-081283 /TDLOFD-081203


Meaning: Indicates the length of the DRXRetransmission Timer dedicated to GERANmeasurement.GUI Value Range: PSF1(1 PDCCH subframes),PSF2(2 PDCCH subframes), PSF4(4 PDCCHsubframes), PSF6(6 PDCCH subframes), PSF8(8PDCCH subframes), PSF16(16 PDCCH subframes),PSF24(24 PDCCH subframes), PSF33(33 PDCCHsubframes)Unit: subframeActual Value Range: PSF1, PSF2, PSF4, PSF6, PSF8,PSF16, PSF24, PSF33Default Value: PSF4(4 PDCCH subframes)

CellDrxPara

ShortDrxSwForMeas


LOFD-081283 /TDLOFD-081203


Meaning: Indicates whether to enable the short DRXcycle dedicated to GERAN measurement.GUI Value Range: OFF(Off), ON(On)Unit: NoneActual Value Range: OFF, ONDefault Value: OFF(Off)

CellDrxPara

ShortDrxCycleForMeas


LOFD-081283 /TDLOFD-081203


Meaning: Indicates the length of the short DRX cyclededicated to GERAN measurement.GUI Value Range: SF2(2 subframes), SF5(5subframes), SF8(8 subframes), SF10(10 subframes),SF16(16 subframes), SF20(20 subframes), SF32(32subframes), SF40(40 subframes), SF64(64subframes), SF80(80 subframes), SF128(128subframes), SF160(160 subframes), SF256(256subframes), SF320(320 subframes), SF512(512subframes), SF640(640 subframes)Unit: subframeActual Value Range: SF2, SF5, SF8, SF10, SF16,SF20, SF32, SF40, SF64, SF80, SF128, SF160,SF256, SF320, SF512, SF640Default Value: SF20(20 subframes)



262

MO Parameter ID

MMLCommand

FeatureID

FeatureName

Description

CellDrxPara

ShortCycleTimerForMeas


LOFD-081283 /TDLOFD-081203


Meaning: Indicates the length of the DRX Short CycleTimer dedicated to GERAN measurement.GUI Value Range: 1~16Unit: NoneActual Value Range: 1~16Default Value: 1



263

10 Counters

Table 10-1 Counters

Counter ID Counter Name CounterDescription

Feature ID Feature Name

1526726992 L.IRATHO.E2G.PrepAttOut

Number of inter-RAT handoverattempts from E-UTRAN toGERAN

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001020LOFD-001023LOFD-001034TDLOFD-001020TDLOFD-001023TDLOFD-001034

PS Inter-RATMobility betweenE-UTRAN andGERANSRVCC to GERANCS Fallback toGERANPS Inter-RATMobility betweenE-UTRAN andGERANSRVCC to GERANCS Fallback toGERAN

1526726993 L.IRATHO.E2G.ExecAttOut

Number of inter-RAT handoverexecutions from E-UTRAN toGERAN



eRAN TDDCS Fallback Feature Parameter Description 10 Counters


264



1526726994 L.IRATHO.E2G.ExecSuccOut

Number ofsuccessful inter-RAT handoversfrom E-UTRAN toGERAN



1526728306 L.IRATHO.E2G.Prep.FailOut.MME

Number of inter-RAT handoverpreparation failuresfrom E-UTRAN toGERAN because offaults on the MMEside

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001034TDLOFD-001034LOFD-001020TDLOFD-001020LOFD-001046TDLOFD-001046LOFD-001073TDLOFD-001073LOFD-001023TDLOFD-001023

CS Fallback toGERANCS Fallback toGERANPS Inter-RATMobility betweenE-UTRAN andGERANPS Inter-RATMobility betweenE-UTRAN andGERANService based inter-RAT handover toGERANService based Inter-RAT handover toGERANDistance basedinter-RAT handoverto GERANDistance basedInter-RAT handoverto GERANSRVCC to GERANSRVCC to GERAN



265



1526728307 L.IRATHO.E2G.Prep.FailOut.NoReply

Number of inter-RAT handoverpreparation failuresfrom E-UTRAN toGERAN because ofno responses fromGERAN





266



1526728308 L.IRATHO.E2G.Prep.FailOut.PrepFailure

Number of inter-RAT handoverpreparation failuresfrom E-UTRAN toGERAN duetobecause GERANcells send handoverpreparation failuremessages



1526728314 L.IRATHO.BlindHO.E2G.ExecAttOut

Number of inter-RAT blindhandoversexecutions from E-UTRAN toGERAN





267



1526728315 L.IRATHO.BlindHO.E2G.ExecSuccOut

Number ofsuccessful inter-RAT blindhandovers from E-UTRAN toGERAN



1526728321 L.CSFB.PrepAtt Number of CSFBindicators receivedby the eNodeB

Multi-mode: None

GSM: None

UMTS: None

LTE:LOFD-001033

TDLOFD-001033

LOFD-001034

TDLOFD-001034

LOFD-001035

TDLOFD-001035

CS Fallback toUTRANCS Fallback toUTRANCS Fallback toGERANCS Fallback toGERANCS Fallback toCDMA2000 1xRTTCS Fallback toCDMA2000 1xRTT

1526728322 L.CSFB.PrepSucc Number ofsuccessful CSFBresponses from theeNodeB

Multi-mode: None

GSM: None

UMTS: None

LTE:LOFD-001033

TDLOFD-001033

LOFD-001034

TDLOFD-001034

LOFD-001035

TDLOFD-001035




268



1526728323 L.CSFB.E2W Number ofprocedures forCSFB to WCDMAnetwork

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001033TDLOFD-001033LOFD-070202TDLOFD-081223

CS Fallback toUTRANCS Fallback toUTRANUltra-Flash CSFBto UTRANUltra-Flash CSFBto UTRAN

1526728324 L.CSFB.E2G Number ofprocedures forCSFB to GERAN


CS Fallback toGERANCS Fallback toGERANUltra-Flash CSFBto GERANUltra-Flash CSFBto GERAN

1526728327 L.RRCRedirection.E2G

Number ofredirections from E-UTRAN toGERAN

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001020LOFD-001034TDLOFD-001020TDLOFD-001034

PS Inter-RATMobility betweenE-UTRAN andGERANCS Fallback toGERANPS Inter-RATMobility betweenE-UTRAN andGERANCS Fallback toGERAN

1526728329 L.IRATHO.BlindHO.E2G.PrepAttOut

Number of inter-RAT blindhandover attemptsfrom E-UTRAN toGERAN

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001034TDLOFD-001034

CS Fallback toGERANCS Fallback toGERAN



269



1526728331 L.RRCRedirection.E2G.PrepAtt

Number ofredirectionpreparations fromE-UTRAN toGERAN

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001020LOFD-001034TDLOFD-001020TDLOFD-001034

PS Inter-RATMobility betweenE-UTRAN andGERANCS Fallback toGERANPS Inter-RATMobility betweenE-UTRAN andGERANCS Fallback toGERAN

1526728380 L.IRATHO.E2G.PrepAttOut.PLMN

Number of inter-RAT handoverattempts from E-UTRAN toGERAN for aspecific operator

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001020LOFD-001023LOFD-001034TDLOFD-001020TDLOFD-001023TDLOFD-001034LOFD-001036LOFD-001037TDLOFD-001036TDLOFD-001037LOFD-070206

PS Inter-RATMobility betweenE-UTRAN andGERANSRVCC to GERANCS Fallback toGERANPS Inter-RATMobility betweenE-UTRAN andGERANSRVCC to GERANCS Fallback toGERANRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierHybrid RANSharing



270



1526728381 L.IRATHO.E2G.ExecAttOut.PLMN

Number of inter-RAT handoverexecutions from E-UTRAN toGERAN for aspecific operator





271



1526728382 L.IRATHO.E2G.ExecSuccOut.PLMN

Number ofsuccessful inter-RAT handoversfrom E-UTRAN toGERAN for aspecific operator



1526728386 L.CSFB.PrepAtt.Idle

Number of CSFBindicators receivedby the eNodeB forUEs in idle mode

Multi-mode: None

GSM: None

UMTS: None

LTE:LOFD-001033

TDLOFD-001033

LOFD-001034

TDLOFD-001034

LOFD-001035

TDLOFD-001035




272



1526728387 L.CSFB.PrepSucc.Idle

Number ofsuccessful CSFBresponses from theeNodeB for UEs inidle mode

Multi-mode: None

GSM: None

UMTS: None

LTE:LOFD-001033

TDLOFD-001033

LOFD-001034

TDLOFD-001034

LOFD-001035

TDLOFD-001035


1526728388 L.CSFB.E2W.Idle Number ofprocedures forCSFB to WCDMAnetwork for UEs inidle mode





273



1526728390 L.IRATHO.BlindHO.E2G.PrepAttOut.PLMN

Number of inter-RAT blindhandover attemptsfrom E-UTRAN toGERAN for aspecific operator





274



1526728393 L.IRATHO.BlindHO.E2G.ExecAttOut.PLMN

Number of inter-RAT blindhandoverexecutions from E-UTRAN toGERAN for aspecific operator





275



1526728394 L.IRATHO.BlindHO.E2G.ExecSuccOut.PLMN

Number ofsuccessful inter-RAT blindhandoverexecutions from E-UTRAN toGERAN for aspecific operator



1526728400 L.IRATHO.SRVCC.E2W.PrepAttOut

Number of inter-RAT handoverattempts from E-UTRAN toWCDMA networkfor SRVCC


SRVCC to UTRANSRVCC to UTRANUltra-Flash CSFBto UTRANUltra-Flash CSFBto UTRAN

1526728401 L.IRATHO.SRVCC.E2W.ExecAttOut

Number of inter-RAT handoverexecutions from E-UTRAN toWCDMA networkfor SRVCC





276



1526728402 L.IRATHO.SRVCC.E2W.ExecSuccOut

Number ofsuccessful inter-RAT handoversfrom E-UTRAN toWCDMA networkfor SRVCC



1526728403 L.IRATHO.SRVCC.E2G.PrepAttOut

Number of inter-RAT handoverattempts from E-UTRAN toGERAN forSRVCC


SRVCC to GERANSRVCC to GERANUltra-Flash CSFBto GERANUltra-Flash CSFBto GERAN

1526728404 L.IRATHO.SRVCC.E2G.ExecAttOut

Number of inter-RAT handoverexecutions from E-UTRAN toGERAN forSRVCC



1526728405 L.IRATHO.SRVCC.E2G.ExecSuccOut

Number ofsuccessful inter-RAT handoversfrom E-UTRAN toGERAN forSRVCC



1526728497 L.RRCRedirection.E2W.CSFB

Number of CSFB-based redirectionsfrom E-UTRANs toWCDMA network


CS Fallback toUTRANCS Fallback toUTRAN



277



1526728498 L.RRCRedirection.E2G.CSFB

Number of CSFB-based redirectionsfrom E-UTRAN toGERAN




Number of CSFB-based inter-RAThandoverpreparationattempts from E-UTRAN toWCDMA network



1526728505 L.IRATHO.E2W.CSFB.ExecAttOut

Number of CSFB-based inter-RAThandover executionattempts from E-UTRAN toWCDMA network



1526728506 L.IRATHO.E2W.CSFB.ExecSuccOut

Number ofsuccessful CSFB-based inter-RAThandoverexecutions from E-UTRAN toWCDMA network



1526728507 L.IRATHO.E2G.CSFB.PrepAttOut

Number of CSFB-based inter-RAThandoverpreparationattempts from E-UTRAN toGERAN





278



1526728508 L.IRATHO.E2G.CSFB.ExecAttOut

Number of CSFB-based inter-RAThandover executionattempts from E-UTRAN toGERAN



1526728509 L.IRATHO.E2G.CSFB.ExecSuccOut

Number ofsuccessful CSFB-based inter-RAThandoverexecutions from E-UTRAN toGERAN



1526728513 L.CSFB.PrepFail.Conflict

Number of CSFBpreparation failuresbecause of processconflict

Multi-mode: None

GSM: None

UMTS: None

LTE:LOFD-001033

TDLOFD-001033

LOFD-001034

TDLOFD-001034

LOFD-001035

TDLOFD-001035


1526728705 L.FlashCSFB.E2W Number ofprocedures for flashCSFB to WCDMAnetwork


Flash CS Fallbackto UTRANFlash CS Fallbackto UTRAN



279



1526728706 L.FlashCSFB.E2G Number ofprocedures for flashCSFB to GERAN


Flash CS Fallbackto GERANFlash CS Fallbackto GERAN

1526728707 L.CSFB.PrepAtt.Emergency

Number of CSFBindicators receivedby the eNodeB foremergency calls

Multi-mode: None

GSM: None

UMTS: None

LTE:LOFD-001033

TDLOFD-001033

LOFD-001034

TDLOFD-001034

LOFD-001035

TDLOFD-001035


1526728708 L.CSFB.PrepSucc.Emergency

Number ofresponses sent fromthe eNodeB forCSFB triggered foremergency calls

Multi-mode: None

GSM: None

UMTS: None

LTE:LOFD-001033

TDLOFD-001033

LOFD-001034

TDLOFD-001034

LOFD-001035

TDLOFD-001035


1526728709 L.CSFB.E2W.Emergency

Number ofprocedures forCSFB to WCDMAnetwork triggeredfor emergency calls





280



1526728710 L.CSFB.E2G.Emergency

Number ofprocedures forCSFB to GERANtriggered foremergency calls



1526728899 L.IRATHO.E2W.CSFB.MMEAbnormRsp

Number ofresponses forabnormal causesreceived by theeNodeB from theMME duringCSFB-based inter-RAT handoverexecutions from E-UTRAN toWCDMA network



1526728900 L.IRATHO.E2G.CSFB.MMEAbnormRsp

Number ofresponses forabnormal causesreceived by theeNodeB from theMME duringCSFB-based inter-RAT handoverexecutions from E-UTRAN toGERAN



1526728946 L.RIM.SI.E2W.Req Number of timesthe eNodeB sends asystem informationrequest to aWCDMA network



1526728947 L.RIM.SI.E2W.Resp

Number of timesthe eNodeBreceives a systeminformationresponse from aWCDMA network





281



1526728948 L.RIM.SI.E2W.Update

Number of timesthe eNodeBreceives a systeminformation updatefrom a WCDMAnetwork



1526728949 L.RIM.Load.E2W.Req

Number of timesthe eNodeB sends aload informationrequest to aWCDMA network


Inter-RAT LoadSharing to UTRANInter-RAT LoadSharing to UTRAN

1526728950 L.RIM.Load.E2W.Resp

Number of timesthe eNodeBreceives a loadinformationresponse from aWCDMA network



1526728951 L.RIM.Load.E2W.Update

Number of timesthe eNodeBreceives a loadinformation updatefrom a WCDMAnetwork



1526729260 L.CSFB.E2G.Idle Number ofprocedures forCSFB to GERANnetwork for UEs inidle mode





282



1526729433 L.IRATHO.E2G.TimeAvg

Average handoverduration from E-UTRAN toGERAN



1526729504 L.RRCRedirection.E2G.PLMN

Number ofredirections from E-UTRAN toGERAN for aspecific operator

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001020LOFD-001034TDLOFD-001020TDLOFD-001034LOFD-001036LOFD-001037TDLOFD-001036TDLOFD-001037LOFD-070206

PS Inter-RATMobility betweenE-UTRAN andGERANCS Fallback toGERANPS Inter-RATMobility betweenE-UTRAN andGERANCS Fallback toGERANRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierHybrid RANSharing

1526729505 L.CCOwithNACC.E2G.CSFB.ExecAttOut

Number of CSFB-based CCO withNACC executionsfrom E-UTRAN toGERAN





283



1526729506 L.CCOwithNACC.E2G.CSFB.ExecSuccOut

Number ofsuccessful CSFB-based CCOs withNACC from E-UTRAN toGERAN



1526729507 L.CCOwithoutNACC.E2G.CSFB.ExecAttOut

Number of CSFB-based CCO withoutNACC executionsfrom E-UTRAN toGERAN



1526729508 L.CCOwithoutNACC.E2G.CSFB.ExecSuccOut

Number ofsuccessful CSFB-based CCOswithout NACCfrom E-UTRAN toGERAN



1526729509 L.IRATHO.E2W.CSFB.PrepAttOut.Emergency

Number of CSFB-based handoverpreparationattempts toWCDMA networktriggered foremergency calls



1526729510 L.IRATHO.E2W.CSFB.ExecAttOut.Emergency

Number of CSFB-based handoverexecution attemptsto WCDMAnetwork triggeredfor emergency calls





284



1526729511 L.IRATHO.E2W.CSFB.ExecSuccOut.Emergency

Number ofsuccessful CSFB-based handoverexecutions toWCDMA networktriggered foremergency calls



1526729512 L.IRATHO.E2G.CSFB.PrepAttOut.Emergency

Number of CSFB-based handoverpreparationattempts to GERANtriggered foremergency calls



1526729513 L.IRATHO.E2G.CSFB.ExecAttOut.Emergency

Number of CSFB-based handoverexecution attemptsto GERANtriggered foremergency calls



1526729514 L.IRATHO.E2G.CSFB.ExecSuccOut.Emergency

Number ofsuccessful CSFB-based handoverexecutions toGERAN triggeredfor emergency calls





285



1526729515 L.RRCRedirection.E2W.CSFB.TimeOut

Number of CSFB-based blindredirections from E-UTRAN toWCDMA networkcaused by CSFBprotection timerexpiration



1526729516 L.RRCRedirection.E2G.CSFB.TimeOut

Number of CSFB-based blindredirections from E-UTRAN toGERAN caused byCSFB protectiontimer expiration



1526729562 L.IRATHO.NCell.E2G.PrepAttOut

Number ofhandover attemptsfrom a specific E-UTRAN cell to aspecific GERANcell



1526729563 L.IRATHO.NCell.E2G.ExecAttOut

Number ofhandoverexecutions from aspecific E-UTRANcell to a specificGERAN cell





286



1526729564 L.IRATHO.NCell.E2G.ExecSuccOut

Number ofsuccessfulhandovers from aspecific E-UTRANcell to a specificGERAN cell



1526729661 L.RIM.SI.E2G.Req Number of timesthe eNodeB sends asystem informationrequest to aGERAN



1526729662 L.RIM.SI.E2G.Resp

Number of timesthe eNodeBreceives a systeminformationresponse from aGERAN



1526729663 L.RIM.SI.E2G.Update

Number of timesthe eNodeBreceives a systeminformation updatefrom a GERAN





287



1526730044 L.CSFB.PrepAtt.PLMN

Number of CSFBindicators receivedby the eNodeB for aspecific operator

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001033TDLOFD-001033LOFD-001034TDLOFD-001034LOFD-001035LOFD-001036LOFD-001037TDLOFD-001036TDLOFD-001037LOFD-070206

CS Fallback toUTRANCS Fallback toUTRANCS Fallback toGERANCS Fallback toGERANCS Fallback toCDMA2000 1xRTTRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierHybrid RANSharing

1526730045 L.CSFB.PrepSucc.PLMN

Number ofsuccessful CSFBresponses sent fromthe eNodeB for aspecific operator

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001033TDLOFD-001033LOFD-001034TDLOFD-001034LOFD-001035LOFD-001036LOFD-001037TDLOFD-001036TDLOFD-001037LOFD-070206

CS Fallback toUTRANCS Fallback toUTRANCS Fallback toGERANCS Fallback toGERANCS Fallback toCDMA2000 1xRTTRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierHybrid RANSharing



288



1526730050 L.RRCRedirection.E2G.CSFB.PLMN

Number of CSFB-based redirectionsfrom E-UTRAN toGERAN for aspecific operator

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LOFD-001034TDLOFD-001034LOFD-001036LOFD-001037TDLOFD-001036TDLOFD-001037LOFD-070206

CS Fallback toGERANCS Fallback toGERANRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierRAN Sharing withCommon CarrierRAN Sharing withDedicated CarrierHybrid RANSharing

1526730051 L.IRATHO.E2G.CSFB.PrepAttOut.PLMN

Number of CSFB-based handoverpreparationattempts from E-UTRAN toGERAN for aspecific operator



1526730052 L.IRATHO.E2G.CSFB.ExecAttOut.PLMN

Number of CSFB-based handoverexecution attemptsfrom E-UTRAN toGERAN for aspecific operator





289



1526730053 L.IRATHO.E2G.CSFB.ExecSuccOut.PLMN

Number ofsuccessful CSFB-based handoverexecutions from E-UTRAN toGERAN for aspecific operator



1526730076 L.IRATHO.E2W.CSFB.Prep.FailOut.MME

Number of CSFB-based outgoinghandoverpreparation failuresfrom E-UTRAN toWCDMA networkbecause of theMME side causes



1526730077 L.IRATHO.E2W.CSFB.Prep.FailOut.PrepFailure

Number of CSFB-based outgoinghandoverpreparation failuresfrom E-UTRAN toWCDMA networkbecause of theresponse ofhandoverpreparation failurefrom WCDMAnetwork



1526730078 L.IRATHO.E2W.CSFB.Prep.FailOut.NoReply

Number of CSFB-based outgoinghandoverpreparation failuresfrom E-UTRAN toWCDMA networkbecause of noresponse fromWCDMA network





290



1526730082 L.IRATHO.E2W.SRVCC.Prep.FailOut.MME

Number of SRVCC-based outgoinghandoverpreparation failuresfrom E-UTRAN toWCDMA networkbecause of theMME side causes



1526730083 L.IRATHO.E2W.SRVCC.Prep.FailOut.PrepFailure

Number of SRVCC-based outgoinghandoverpreparation failuresfrom E-UTRAN toWCDMA networkbecause of theresponse ofhandoverpreparation failurefrom WCDMAnetwork



1526730084 L.IRATHO.E2W.SRVCC.Prep.FailOut.NoReply

Number of SRVCC-based outgoinghandoverpreparation failuresfrom E-UTRAN toWCDMA networkbecause of noresponse fromWCDMA network



1526730088 L.IRATHO.E2G.SRVCC.Prep.FailOut.MME

Number of SRVCC-based outgoinghandoverpreparation failuresfrom E-UTRAN toGERAN because ofthe MME sidecauses





291



1526730089 L.IRATHO.E2G.SRVCC.Prep.FailOut.PrepFailure

Number of SRVCC-based outgoinghandoverpreparation failuresfrom E-UTRAN toGERAN because ofthe response ofhandoverpreparation failurefrom GERAN



1526730090 L.IRATHO.E2G.SRVCC.Prep.FailOut.NoReply

Number of SRVCC-based outgoinghandoverpreparation failuresfrom E-UTRAN toGERAN because ofno response fromGERAN



1526730140 L.Paging.UU.Succ.CSFB

Number of pagingresponses for CSFBreceived from UEsin a cell

Multi-mode: NoneGSM: NoneUMTS: NoneLTE: LBFD-002011TDLBFD-002011LOFD-001033TDLOFD-001033LOFD-001034TDLOFD-001034LOFD-001035TDLOFD-001035

PagingPagingCS Fallback toUTRANCS Fallback toUTRANCS Fallback toGERANCS Fallback toGERANCS Fallback toCDMA2000 1xRTTCS Fallback toCDMA2000 1xRTT



292



1526730145 L.Paging.S1.Rx.CS Number of receivedpaging messageswith the IE CNDOMAIN set to CSover the S1interface in a cell

Multi-mode: NoneGSM: NoneUMTS: NoneLTE: LBFD-002011TDLBFD-002011LOFD-001033TDLOFD-001033LOFD-001034TDLOFD-001034LOFD-001035TDLOFD-001035

PagingPagingCS Fallback toUTRANCS Fallback toUTRANCS Fallback toGERANCS Fallback toGERANCS Fallback toCDMA2000 1xRTTCS Fallback toCDMA2000 1xRTT

1526730146 L.IRATHO.CSFB.SRVCC.E2W.PrepAttOut

Number of SRVCC-based outgoinghandover attemptsfrom E-UTRAN toWCDMA networkfor ultra-flashCSFB


Ultra-Flash CSFBto UTRANUltra-Flash CSFBto UTRAN


Number of SRVCC-based outgoinghandoverexecutions from E-UTRAN toWCDMA networkfor ultra-flashCSFB



1526730148 L.IRATHO.CSFB.SRVCC.E2W.ExecSuccOut

Number ofsuccessful SRVCC-based outgoinghandovers from E-UTRAN toWCDMA networkfor ultra-flashCSFB




Number of SRVCC-based outgoinghandover attemptsfrom E-UTRAN toGERAN for ultra-flash CSFB


Ultra-Flash CSFBto GERANUltra-Flash CSFBto GERAN



293



1526733007 L.IRATHO.CSFB.SRVCC.E2G.ExecAttOut

Number of SRVCC-based outgoinghandoverexecutions from E-UTRAN toGERAN for ultra-flash CSFB



1526733008 L.IRATHO.CSFB.SRVCC.E2G.ExecSuccOut

Number ofsuccessful SRVCC-based outgoinghandovers from E-UTRAN toGERAN for ultra-flash CSFB



1526733009 L.IRATHO.CSFB.SRVCC.E2G.MMEAbnormRsp

Number ofabnormal responsesfrom the MMEduring outgoinghandovers from E-UTRAN toGERAN for ultra-flash CSFB



1526736728 L.IRATHO.CSFB.SRVCC.E2W.MMEAbnormRsp

Number ofresponses forabnormal causesreceived by theeNodeB from theMME duringhandovers from theE-UTRAN toWCDMA networksfor ultra-flashCSFB



1526736729 L.IRATHO.E2W.CSFB.SRVCC.Prep.FailOut.MME

Number of MME-caused preparationfailures of outgoinghandovers toWCDMA networksfor ultra-flashCSFB





294



1526736730 L.IRATHO.E2W.CSFB.SRVCC.Prep.FailOut.PrepFailure

Number ofpreparation failuresof outgoinghandovers toWCDMA networksfor ultra-flashCSFB because ofthe response ofhandoverpreparation failuresent by theWCDMA networks



1526736731 L.IRATHO.E2W.CSFB.SRVCC.Prep.FailOut.NoReply

Number ofpreparation failuresof outgoinghandovers toWCDMA networksfor ultra-flashCSFB because ofno response fromthe WCDMAnetworks



1526736732 L.IRATHO.E2G.CSFB.SRVCC.Prep.FailOut.MME

Number of MME-caused preparationfailures of outgoinghandovers toGERANs for ultra-flash CSFB



1526736733 L.IRATHO.E2G.CSFB.SRVCC.Prep.FailOut.PrepFailure

Number ofpreparation failuresof outgoinghandovers toGERANs for ultra-flash CSFB becauseof the response ofhandoverpreparation failuresent by theGERANs





295



1526736734 L.IRATHO.E2G.CSFB.SRVCC.Prep.FailOut.NoReply

Number ofpreparation failuresof outgoinghandovers toGERANs for ultra-flash CSFB becauseof no response fromthe GERANs



1526741920 L.HHO.FailOut.HOCancel.FlowConflict

Number of timesinter-eNodeB intra-duplex-modeoutgoing handoversare canceled due toflow conflicts

Multi-mode: NoneGSM: NoneUMTS: NoneLTE:LBFD-00201801LBFD-00201802TDLBFD-00201801TDLBFD-00201802LOFD-001033TDLOFD-001033LOFD-001034TDLOFD-001034

Coverage BasedIntra-frequencyHandoverCoverage BasedInter-frequencyHandoverCoverage BasedIntra-frequencyHandoverCoverage BasedInter-frequencyHandoverCS Fallback toUTRANCS Fallback toUTRANCS Fallback toGERANCS Fallback toGERAN



296



1526741921 L.HHO.InterFddTdd.FailOut.HOCancel.FlowConflict

Number of timesinter-eNodeB inter-duplex-modeoutgoing handoversare canceled due toflow conflicts



1526741922 L.IRATHO.E2W.HOCancel.FlowConflict

Number of timesEUTRAN-to-WCDMAhandovers arecanceled due toflow conflict





297



1526741923 L.IRATHO.E2G.HOCancel.FlowConflict

Number of timesEUTRAN-to-GERAN handoversare canceled due toflow conflicts



1526741924 L.IRATHO.E2T.HOCancel.FlowConflict

Number of timesEUTRAN-to-TDSCDMAhandovers arecanceled due toflow conflicts





298



1526742170 L.IRATHO.SRVCC.FailOut.HOCancel.ReEst

Number of SRVCC-based OutgoingHandoverCancellations Dueto RRC ConnectionRe-establishments





299

11 Glossary

For the acronyms, abbreviations, terms, and definitions, see Glossary.

eRAN TDDCS Fallback Feature Parameter Description 11 Glossary


300

12 Reference Documents

1. 3GPP TS 23.216, "Single Radio Voice Call Continuity (SRVCC); Stage 2"2. 3GPP TS 23.272, "Circuit Switched (CS) fallback in Evolved Packet System (EPS)"3. 3GPP TS 23.401, "General Packet Radio Service (GPRS) enhancements for Evolved

Universal Terrestrial Radio Access Network (E-UTRAN) access"4. 3GPP TS 36.300, "E-UTRAN Overall description"5. 3GPP TS 48.018, "General Packet Radio Service (GPRS); Base Station System (BSS) -

Serving GPRS Support Node (SGSN); BSS GPRS protocol (BSSGP) "6. VoLGA Forum Specifications7. Emergency Call8. Inter-RAT Mobility Management in Connected Mode9. Interoperability Between GSM and LTE10. Interoperability Between UMTS and LTE11. LCS

eRAN TDDCS Fallback Feature Parameter Description 12 Reference Documents


301

13 Appendix

13.1 Signaling Procedures Involved in CSFB to UTRAN

13.1.1 Combined EPS/IMSI Attach ProcedureThe combined EPS/IMSI attach procedure is performed by exchanging NAS messages.Therefore, this procedure is transparent to the eNodeBs. After a CSFB-capable UE is poweredon in the E-UTRAN, the UE initiates a combined EPS/IMSI attach procedure, as shown inFigure 13-1.

Figure 13-1 Combined EPS/IMSI attach procedure

HSS: home subscriber server VLR: visitor location register

eRAN TDDCS Fallback Feature Parameter Description 13 Appendix


302

NOTE

The symbols that appear in signaling procedure figures throughout this document are explained asfollows:

l An arrow denotes the transmission of a message.

l A plain box denotes a mandatory procedure.

l A dashed box denotes an optional procedure.

The combined EPS/IMSI attach procedure is described as follows:

1. The UE sends a Combined attach request message to the MME, requesting a combinedEPS/IMSI attach procedure. This message also indicates whether the CSFB or SMS overSGs function is required.

2. The EPS attach procedure is performed in the same way as it is performed within theLTE system. For details, see section 5.3.2 in 3GPP TS 23.401 V9.2.0.

3. The MME allocates an LAI to the UE, and then it finds the MSC/VLR for the UE basedon the LAI. If multiple PLMNs are available for the CS domain, the MME selects aPLMN based on the selected PLMN information reported by the eNodeB. Then, theMME sends the MSC/VLR a Location update request message, which contains the newLAI, IMSI, MME name, and location update type.

4. The MSC/VLR performs the location update procedure in the CS domain.5. The MSC/VLR responds with a Location update accept message that contains

information about the VLR and temporary mobile subscriber identity (TMSI). Thelocation update procedure is successful.

6. The UE is informed that the combined EPS/IMSI attach procedure is successful. If thenetwork supports SMS over SGs but not CSFB, the message transmitted to the UEcontains the information element (IE) SMS-only. The message indicates that thecombined EPS/IMSI attach procedure is successful but only SMS is supported.

13.1.2 CSFB Based on PS HandoverDuring CSFB based on PS handover, the UE is transferred from the E-UTRAN to theUTRAN by performing a PS handover. It then initiates a CS service in the UTRAN.

Mobile-Originated CallFigure 13-2 shows the procedure for CSFB to UTRAN based on PS handover for mobile-originated calls.



303

Figure 13-2 CSFB to UTRAN based on PS handover for mobile-originated calls

1. The UE sends the MME an NAS message Extended Service Request to initiate a CSservice.

2. The MME sends an S1-AP message to instruct the eNodeB to initiate a CSFB procedure.If the MME supports the LAI-related feature, the MME also delivers the LAI to theeNodeB.

3. The eNodeB determines whether to perform a blind handover based on the UEcapabilities, parameters settings, and algorithm policies.

4. The eNodeB initiates the preparation phase for a PS handover. If the preparation issuccessful, the eNodeB instructs the UE to perform a handover.

NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 3.5 Decision and 3.6Execution.

5. After the handover, the UE may initiate a CS call establishment procedure with an LAUor combined RAU/LAU procedure in the UTRAN.

6. The follow-up procedures are performed for the PS handover. These procedures includedata forwarding, path switching, and RAU. This step is performed together with 5.

Mobile-Terminated CallFigure 13-3 shows the procedure for CSFB to UTRAN based on PS handover for mobile-terminated calls.



304

Figure 13-3 CSFB to UTRAN based on PS handover for mobile-terminated calls

1. The MSC sends a Paging Request message from the CS domain to the MME over theSGs interface. Then, either of the following occurs:– If the UE is in idle mode, the MME sends a Paging message to the eNodeB. Then

the eNodeB sends a Paging message over the Uu interface to inform the UE of anincoming call from the CS domain.

– If the UE is in active mode, the MME sends the UE an NAS message to inform theUE of an incoming call from the CS domain.

2. The UE sends an Extended Service Request message containing a CS Fallback Indicatorafter receiving the paging message from the CS domain.

3. The MME instructs the eNodeB over the S1 interface to perform CSFB.4. The subsequent steps are similar to steps 3 through 6 in the procedure for CSFB to

UTRAN based on PS handover for mobile-originated calls. The only difference is thatthe UE sends a Paging Response message from the UTRAN cell.

13.1.3 CSFB Based on RedirectionDuring CSFB based on PS redirection, the eNodeB receives a CS Fallback Indicator, and thenit sends an RRC Connection Release message to release the UE. The message containsinformation about a target UTRAN frequency, reducing the time for the UE to search for atarget network. After selecting the UTRAN, the UE acquires the system information of aUTRAN cell. Then, the UE performs initial access to the cell to initiate a CS service. For theUTRAN, the UE is an initially accessing user.

Mobile-Originated CallFigure 13-4 shows the procedure for CSFB to UTRAN based on redirection for mobile-originated calls.



305

Figure 13-4 CSFB to UTRAN based on redirection for mobile-originated calls




4. The eNodeB sends an RRC Connection Release message to instruct the UE to perform aredirection. The message contains information about a target UTRAN frequency. Then,the eNodeB initiates an S1 UE context release procedure.

NOTE


5. The UE may initiate an LAU, a combined RAU/LAU, or both an RAU and an LAU inthe target cell.

6. The UE initiates a CS call establishment procedure in the target UTRAN cell.

Mobile-Terminated Call

In a mobile-terminated call, the MSC sends a Paging request message from the CS domain tothe MME over the SGs interface, and then the MME or eNodeB initiates a paging procedurefor the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFBBased on PS Handover. The subsequent steps are the same as the steps in the procedure forCSFB to UTRAN based on redirection for mobile-originated calls.



306

13.1.4 Flash CSFBDuring the flash CSFB procedure, the eNodeB receives a CS Fallback Indicator, and then itsends an RRC Connection Release message to release the UE. The message containsinformation about a target UTRAN frequency, as well as one or more physical cell identitiesand their associated system information. In this way, the UE can quickly access the targetUTRAN without the need to perform the procedure for acquiring system information of thetarget UTRAN cell. Then, the UE can directly initiate a CS service in the UTRAN cell.

Mobile-Originated Call

Figure 13-5 shows the procedure for CSFB to UTRAN based on flash redirection for mobile-originated calls.

Figure 13-5 CSFB to UTRAN based on flash redirection for mobile-originated calls




4. The eNodeB sends an RRC Connection Release message to instruct the UE to perform aredirection. The message contains information about a target UTRAN frequency, as wellas one or more physical cell identities and their associated system information. Then, theeNodeB initiates an S1 UE context release procedure.



307

NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 3.5 Decision and 3.6Execution. The system information of the target cell is acquired during the RIM procedure.


6. The UE initiates a CS call establishment procedure in the target UTRAN cell.

Mobile-Terminated CallIn a mobile-terminated call, the MSC sends a Paging request message from the CS domain tothe MME over the SGs interface, and then the MME or eNodeB initiates a paging procedurefor the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFBBased on PS Handover. The subsequent steps are the same as the steps in the procedure forCSFB to UTRAN based on flash redirection for mobile-originated calls.

13.1.5 Ultra-Flash CSFB to UTRAN

Mobile-Originated CallFigure 13-6 shows the procedure of ultra-flash CSFB to UTRAN for mobile-originated calls.For details about the standard procedure, see chapter 6 "Mobile Originating Call" in 3GPP TS23.272 V10.9.0 and 3GPP TS 24.008 V11.0.0.



308

Figure 13-6 Flash CSFB to UTRAN for mobile-originated calls

Mobile-Terminated CallFigure 13-7 shows the procedure of ultra-flash CSFB to UTRAN for mobile-terminated calls.For details about the standard procedure, see chapter 7 "Mobile Terminating Call" in 3GPPTS 23.272 V10.9.0 and 3GPP TS 24.008 V11.0.0.



309

Figure 13-7 Ultra-flash CSFB to UTRAN for mobile-terminated calls

Steps 1 to 4b: The UE initiates voice services (mobile-originated calls and mobile-terminatedcalls) on the E-UTRAN. The eNodeB triggers SRVCC to UTRAN. Special treatment has beenapplied to the MME and MSC to ensure a proper procedure.

Step 3b: The RNC receives an SRVCC request and prepares CS resources.

Step 4: The eNodeB receives the handover command transferred over the core network andsends it to the UE.

Step 5: The UE is transferred to the UTRAN.

Steps 6 to 9: The UE establishes voice services on the UTRAN. Signaling is transmitted at aspeed of 13.6 kbit/s, which accelerates the transfer and reduces delays.

As shown in the preceding figures, Ultra-Flash CSFB to UTRAN excludes the followingprocedures:

l Authentication procedureThe UE has been authenticated in the LTE system before CSFB to UTRAN.

l Ciphering procedureThe UE has performed ciphering as instructed during SRVCC. Therefore, the cipheringprocedure is not required after the UE is transferred to the UTRAN.



310

l IMEI check procedureThe MME has sent the IMEI to the MSC during the preparation for SRVCC. Theprocedure is not required in the UTRAN after SRVCC.

l CS resource setup procedureThe UTRAN system has prepared CS resources during SRVCC and therefore the UEdoes not need to reestablish the CS resource after SRVCC. The procedure is not requiredin the UTRAN after SRVCC.

13.1.6 Redirection-based CSFB Optimization for UEs in IdleMode

After the eNodeB receives an initial context setup request with a CS Fallback Indicator fromthe MME, the eNodeB does not perform the UE capability query, security mode activation, orRRC connection reconfiguration procedure with dashed lines in the following figure. If theeNodeB does not obtain the UE capability before CSFB execution, the eNodeB still needs toinitiate a UE capability query procedure.

Figure 13-8 Redirection-based CSFB optimization for UEs in idle mode

13.1.7 Signaling Procedures for SMSSMS services are unknown to the eNodeB because SMS messages are encapsulated in NASmessages. During interworking with the UTRAN, SMS messages are exchanged between the



311

MME and the MSC over the SGs interface. Because a UE does not require fallback to theUTRAN to perform an SMS service, the SMS over SGs function can be used in a placecovered only by the E-UTRAN.

As the SMS service is transparent to the eNodeB, the procedure is not described in thisdocument. For details about the procedure, see section 8.2 in 3GPP TS 23.272 V10.0.0.

13.1.8 Emergency CallThe CSFB procedure for an emergency call is the same as the CSFB procedure for a normalmobile-originated voice service. The UE sends an RRC Connection Request message over theUu interface or the MME sends an Initial Context Setup Request or UE Context ModificationRequest message, which contains an IE to inform the eNodeB of the service type. Emergencycalls take precedence over other services in the eNodeB.

If PS handover is used for CSFB for emergency calls, the eNodeB does not restrict the cells inthe handover restriction list when selecting the target cell. The eNodeB sends the RNC ahandover request with the IE CSFB high priority in the IE Source to Target TransparentContainer. This request informs the RNC that a CSFB procedure is required for an emergencycall. Upon receiving the information, the RNC preferentially processes this call when usingrelated algorithms such as admission control.

If redirection is used for CSFB for emergency calls, the RRC Connection Request messagethat the UE sends when accessing the UTRAN contains the indication of a CS emergencycall.

The UTRAN will treat this call as a common CS emergency call. For details about admissionand preemption of emergency calls, see Emergency Call.

13.1.9 CSFB for LCSAfter a UE initiates an LCS request, the MME performs an attach or combined TAU/LAUprocedure to inform the UE of the LCS capability of the EPS. If the EPS does not supportLCS, the UE falls back to the UTRAN to initiate LCS under the control of the EPS. TheCSFB procedure is the same as the procedure for CSFB to UTRAN for mobile-originatedcalls.

If the UTRAN initiates an LCS request towards a UE camping on an E-UTRAN cell, theMSC sends an LCS indicator to the MME over the SGs interface. Then, the MME instructsthe eNodeB to perform CSFB for the UE. The CSFB procedure is the same as the procedurefor CSFB to UTRAN for mobile-terminated calls. The UE performs the LCS service after thefallback to the UTRAN.

For details about the CSFB procedure for LCS, see section 8.3 in 3GPP TS 23.272 V10.0.0and LCS.

13.2 Signaling Procedures Involved in CSFB to GERAN

13.2.1 Combined EPS/IMSI Attach ProcedureThe combined EPS/IMSI attach procedure for CSFB to GERAN is the same as that for CSFBto UTRAN. For details, see 13.1.1 Combined EPS/IMSI Attach Procedure.



312

13.2.2 CSFB Based on PS HandoverDuring CSFB based on PS handover, the UE is transferred from the E-UTRAN to theGERAN by performing a PS handover. It then initiates a CS service in the GERAN. If theGERAN or UE does not support dual transfer mode (DTM, in which CS and PS services runsimultaneously), the ongoing PS services of the UE are suspended before a CS service is setup.


Figure 13-9 shows the procedure for CSFB to GERAN based on PS handover for mobile-originated calls.

Figure 13-9 CSFB to GERAN based on PS handover for mobile-originated calls

The procedure is described as follows:

1. The UE sends the MME a NAS message Extended service request to initiate a CSservice.

2. The MME instructs the eNodeB to initiate a CSFB procedure. If the MME supports theLAI-related feature, the MME also delivers the LAI to the eNodeB.

3. The eNodeB determines whether to perform blind handover based on the UEcapabilities, parameters settings, and algorithm policies.

4. The eNodeB initiates the preparation phase for a PS handover. If the preparation issuccessful, the eNodeB instructs the UE to perform a handover. If the GERAN or UEdoes not support DTM, the ongoing PS services of the UE are suspended, and the SGSNupdate bearers with the S-GW/P-GW.



313

NOTE


5. After the handover, the UE may initiate a CS call establishment procedure with an LAUor combined RAU/LAU procedure in the GERAN.

6. The follow-up procedures are performed for the PS handover. These procedures includedata forwarding, path switching, and RAU, which are performed together with step 5.

Mobile-Terminated CallIn a mobile-terminated call, the MSC sends a Paging request message from the CS domain tothe MME over the SGs interface, and then the MME or eNodeB initiates a paging procedurefor the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFBBased on PS Handover. The subsequent steps are the same as the steps in the procedure forCSFB to GERAN based on PS handover for mobile-originated calls.

13.2.3 CSFB Based on CCO/NACCDuring CSFB based on CCO/NACC, the eNodeB receives a CS Fallback Indicator from theMME, and then it sends a Mobility From EUTRA Command message to the UE over the Uuinterface. The message contains information about the operating frequency, ID, and systeminformation of a target GERAN cell. It then initiates a CS service in the GERAN. The UEsearches for a target cell based on the information it received, and then it performs initialaccess to the cell to initiate a CS service. If the GERAN or UE does not support DTM, theongoing PS services of the UE are suspended before a CS service is set up.

Mobile-Originated CallFigure 13-10 shows the procedure for CSFB to GERAN based on CCO/NACC for mobile-originated calls.



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Figure 13-10 CSFB to GERAN based on CCO/NACC for mobile-originated calls




4. The eNodeB sends a Mobility From EUTRA Command message over the Uu interfaceto indicate the operating frequency and ID of the target GERAN cell. If the source cellhas the system information of the target cell, the system information is also carried in themessage.

NOTE


5. The UE initiates an LAU, a combined RAU/LAU, or both an RAU and an LAU in thetarget cell.

6. If DTM is not supported by the UE or GERAN, the ongoing PS services of the UE aresuspended.

7. The UE initiates a CS call establishment procedure in the target GERAN cell.8. The eNodeB initiates an S1-based UE context release procedure.

Mobile-Terminated CallIn a mobile-terminated call, the MSC sends a Paging request message from the CS domain tothe MME over the SGs interface, and then the MME or eNodeB initiates a paging procedure



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for the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFBBased on PS Handover. The subsequent steps are the same as the steps in the procedure forCSFB to GERAN based on CCO/NACC for mobile-originated calls.

13.2.4 CSFB Based on RedirectionDuring CSFB based on redirection, the eNodeB receives a CS Fallback Indicator, and then itsends an RRC Connection Release message to release the UE. The message containsinformation about a target GERAN frequency, reducing the time for the UE to search for atarget network. After selecting the GERAN, the UE acquires the system information of aGERAN cell. Then, the UE performs initial access to the cell to initiate a CS service. For theGERAN, the UE is an initially accessing user.


Figure 13-11 shows the procedure for CSFB to GERAN based on redirection for mobile-originated calls.

Figure 13-11 CSFB to GERAN based on redirection for mobile-originated calls

The procedure is described as follows:

1. The UE sends the MME a NAS message Extended service request to initiate a CSservice.


3. The eNodeB determines whether to perform blind handover based on the UEcapabilities, parameters settings, and algorithm policies.



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4. The eNodeB sends an RRC Connection Release message to instruct the UE to perform aredirection. The message contains information about a target GERAN frequency. Then,the eNodeB initiates an S1 UE context release procedure.

NOTE



6. If the GERAN or UE does not support DTM, the ongoing PS services of the UE aresuspended.

7. The UE initiates a CS call establishment procedure in the target GERAN cell.

Mobile-Terminated CallIn a mobile-terminated call, the MSC sends a Paging request message from the CS domain tothe MME over the SGs interface, and then the MME or eNodeB initiates a paging procedurefor the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFBBased on PS Handover. The subsequent steps are the same as the steps in the procedure forCSFB to GERAN based on redirection for mobile-originated calls.

13.2.5 Flash CSFBDuring the flash CSFB procedure, the eNodeB receives a CS Fallback Indicator, and then itsends an RRC Connection Release message to release the UE. The message containsinformation about a target GERAN frequency, as well as one or more physical cell identitiesand their associated system information. In this way, the UE can quickly access the targetGERAN without the need to perform the procedure for acquiring system information of thetarget GERAN cell. It then initiates a CS service in the GERAN. If the GERAN or UE doesnot support DTM, the ongoing PS services of the UE are suspended before a CS service is setup.

Because flash CSFB complies with 3GPP Release 9, the networks and UEs involved mustsupport 3GPP Release 9 or later.

Mobile-Originated CallFigure 13-12 shows the procedure for CSFB to GERAN based on flash redirection formobile-originated calls.



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Figure 13-12 CSFB to GERAN based on flash redirection for mobile-originated calls



3. The eNodeB determines whether to perform a blind redirection based on the UEcapabilities, parameters settings, and algorithm policies.

4. The eNodeB sends an RRC Connection Release message to instruct the UE to perform aredirection. The message contains information about a target GERAN carrier frequencygroup, as well as one or more physical cell identities and their associated systeminformation. Then, the eNodeB initiates an S1 UE context release procedure.

NOTE

For details about how the eNodeB selects a target cell and a CSFB policy, see 4.5 Decision and 4.6Execution. The system information of the target cell is acquired during the RIM procedure.

5. The UE initiates an LAU, a combined RAU/LAU, or both an RAU and an LAU in thetarget cell.

6. If DTM is not supported by the UE or GERAN, the ongoing PS services of the UE aresuspended.

7. The UE initiates a CS call establishment procedure in the target GERAN cell.

Mobile-Terminated Call

In a mobile-terminated call, the MSC sends a Paging request message from the CS domain tothe MME over the SGs interface, and then the MME or eNodeB initiates a paging procedure



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for the UE. The paging procedure is similar to that for UTRAN described in 13.1.2 CSFBBased on PS Handover. The subsequent steps are the same as the steps in the procedure forCSFB to GERAN based on flash redirection for mobile-originated calls.

13.2.6 Ultra-Flash CSFB to GERANUltra-flash CSFB to GERAN is a Huawei-proprietary procedure. To enable this feature, theMSC, MME, and eNodeB must all be provided by Huawei and support this feature.Resources are prepared in advance on the GERAN using the SRVCC procedure, andauthentication and ciphering procedures are excluded to reduce delays. The following figuresshow ultra-flash CSFB to GERAN of mobile-originated calls and mobile-terminated calls,respectively.

Figure 13-13 Ultra-flash CSFB to GERAN for mobile-originated calls



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Figure 13-14 Ultra-flash CSFB to GERAN for mobile-terminated calls

Steps 1 to 3a: The UE initiates voice services (mobile-originated calls and mobile-terminatedcalls) on the E-UTRAN. The eNodeB triggers SRVCC to GERAN. Special treatment has beenapplied to the MME and MSC to ensure a proper procedure.

Step 3b: The BSC receives an SRVCC request and prepares CS resources.

Step 4: The eNodeB receives the handover command transferred over the core network andsends it to the UE.

Step 5: The UE is transferred to the GERAN.

Steps 6 to 9: The UE establishes voice services on the GERAN. Signaling is carried on theTCH, which accelerates the transfer and reduces delays.

As shown in the preceding figures, ultra-flash CSFB to GERAN excludes the followingprocedures:

l Authentication procedureThe UE has been authenticated in the LTE system before CSFB to GERAN.

l Ciphering procedureThe UE has performed ciphering as instructed during SRVCC. Therefore, the cipheringprocedure is not required after the UE is transferred to the GERAN.



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l IMEI check procedureThe MME has sent the IMEI to the MSC during the preparation for SRVCC. There, theprocedure is not required in the GERAN after SRVCC.

l CS resource setup procedureThe GSM system has prepared CS resources during SRVCC and therefore the UE doesnot need to reestablish the CS resource after SRVCC. There, the procedure is notrequired in the GERAN after SRVCC.

If the Fast Return to LTE feature is enabled on the GERAN side, the UE can quickly return tothe E-UTRAN when it completes the voice service on the GERAN. To achieve this, theChannel Release message must contain E-UTRA frequency information, based on which theUE selects a suitable E-UTRAN cell to camp on.

When IratMeasCfgTransSwitch is set on, the eNodeB filters E-UTRA frequenciessupported by the UE based on the UE capability to obtain a frequency set. During the SRVCCprocedure, the eNodeB sends the target BSC a Handover Required message containing thefrequency set, which serves as a reference for the fast return procedure.

When DrxForMeasSwitch is set to ON, the eNodeB supports specific DRX parameters formeasurements during the delivery of measurement configurations about GERAN.Measurements are accelerated for UEs that support DRX-based measurements. Other UEsstill use the gap-assisted measurement method.

13.2.7 Signaling Procedures for SMSSMS services are unknown to the eNodeB because SMS messages are encapsulated in NASmessages. During interworking with the GERAN, SMS messages are exchanged between theMME and the MSC over the SGs interface. Because a UE does not require fallback to theGERAN to perform an SMS service, the SMS over SGs function can be used in a placecovered only by the E-UTRAN.

As the SMS service is transparent to the eNodeB, the procedure is not described in thisdocument. For details about the procedure, see section 8.2 in 3GPP TS 23.272 V10.0.0.

13.2.8 Emergency CallThe CSFB procedure for an emergency call is the same as the CSFB procedure for a normalmobile-originated voice service. The UE sends an RRC Connection Request message over theUu interface or the MME sends an Initial Context Setup Request or UE Context ModificationRequest message, which contains an IE to inform the eNodeB of the service type. Emergencycalls take precedence over other services in the eNodeB.

If PS handover is used for CSFB for emergency calls, the eNodeB does not restrict the cells inthe handover restriction list when selecting the target cell.

If redirection is used for CSFB for emergency calls, the Channel Request message that the UEsends when accessing the GERAN contains the indication of a CS emergency call.

The GERAN will treat this call as a common CS emergency call. For details about admissionand preemption of emergency calls, see Emergency Call.

13.2.9 CSFB for LCSAfter a UE initiates an LCS request, the MME performs an attach or combined TAU/LAUprocedure to inform the UE of the LCS capability of the EPS. If the EPS does not support



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LCS, the UE falls back to the GERAN to initiate LCS under the control of the EPS. TheCSFB procedure is the same as the procedure for CSFB to GERAN for mobile-originatedcalls.

If the GERAN initiates an LCS request towards a UE camping on an E-UTRAN cell, theMSC sends an LCS indicator to the MME over the SGs interface. Then, the MME instructsthe eNodeB to perform CSFB for the UE. The CSFB procedure is the same as the procedurefor CSFB to GERAN for mobile-terminated calls. The UE performs the LCS service after thefallback to the GERAN.

For details about the CSFB procedure for LCS, see section 8.3 in 3GPP TS 23.272 V10.0.0and LCS.



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Technology

CS FALLBACK PARAMETER