Fast Radio Bearer Setup

Fast Radio Bearer Setup

Contents

3.4.17 Fast Radio Bearer Setup

WCDMA RAN

Fast Radio Bearer Setup Feature Parameter Descripti onIssue 01

Date 2014-04-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2014. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior written consent 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 respective holders.

NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase 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 the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

3.4.17 Contents

1 About This Document

1.1 Scope

1.2 Intended Audience

1.3 Change History

1.4 Differences Between Base Station Types

2 Overview

2.1 Background

2.2 Introduction

2.3 Benefits

3 Technical Description

3.1 Fast Reconfiguration Requirements

3.2 Fast Reconfiguration Signaling Procedure

4 Related Features

5 Network Impact

6 Engineering Guidelines

6.1 When to Use Fast Radio Bearer Setup

6.2 Required Information

6.3 Deployment

6.3.1 Requirements

6.3.2 Data Preparation

6.3.3 Activation

6.3.3.1 Using MML Commands

6.3.3.2 MML Command Examples

6.3.3.3 Using the CME

6.3.4 Activation Observation

6.3.5 Deactivation




6.4 Performance Monitoring

6.5 Parameter Optimization

6.6 Troubleshooting

7 Parameters

8 Counters

9 Glossary

10 Reference Documents

1 About This Document

1.1 Scope

This document describes WRFD-160106 Fast Radio Bearer Setup, including its technical principles, related features, network impact, and engineering guidelines.

1.2 Intended Audience

This document is intended for personnel who:

Need to understand the features described herein

Work with Huawei products

1.3 Change HistoryThis section provides information about the changes in different document versions. There are two types of changes, which are defined as follows:

Feature change

Changes in features of a specific product version

Editorial change

Changes in wording or addition of information that was not described in the earlier version

RAN16.0 01 (2014-04-30)

This issue includes the following changes.

Change Type Change Description Parameter Change

Feature change Added application scenarios in which the WRFD-160106 Fast Radio Bearer Setup feature is used. It is recommended that this feature be enabled for a cell with light load. For details, see section 6.1 When to Use Fast RadioBearer Setup.

None

Editorial change Optimized the descriptions in this document to improve the readability of this document. None

RAN16.0 Draft B (2014-02-28)

This issue includes the following changes.

Change Type Change Description Parameter Change

Feature change None None

Editorial change Added the descriptions about the feature and function differences between NodeBs of different types. For details, see section 1.4 Differences Between Base Station Types. None

RAN16.0 Draft A (2014-01-20)

This document is created for RAN16.0.

1.4 Differences Between Base Station Types

This document applies to the following types of base stations.

Base Station Model

Macro 3900 series base stationsDBS3800

Fast Radio Bearer Setup http://localhost:7890/printtopics.html?time=Wed Nov 18 2015 20:24:...

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Base Station Model

BTS3812EBTS3812AE

Micro BTS3803EBTS3902E

LampSite DBS3900

The features described in this document are implemented in the same way on macro, micro, and LampSite base stations.

2 Overview

2.1 BackgroundCurrently, radio bearers (RBs) are set up over the Uu interface by using synchronized reconfiguration mode during radio access bearer (RAB) setup. By using synchronized reconfiguration mode, the RNC, NodeB, and UE activate new link configurations simultaneously, and the RNC calculates the activation time. In most cases, the activation time is set to a large value to ensure that all new linkshave been configured for the RNC, NodeB, and UE during the activation on a network. Long activation time increases access delays, and therefore the WRFD-160106 Fast Radio Bearer Setup feature is introduced to reduce such delays.

2.2 Introduction

When RBs are set up over the Uu interface after a UE initiates a service, the RNC uses fast reconfiguration mode based on NodeB capabilities and the load status of the cell that the UE camps on. By using fast reconfiguration mode, the RNC, NodeB, and UE activate corresponding link configurations at different time that differs from the time the new link configurations are activated over the Uuinterface. Figure 1 and Figure 2 show the signaling procedures for synchronized reconfiguration and fast reconfiguration modes when a 12.2 kbit/s AMR service is set up.

Figure 2-1 Signaling procedure for synchronized reconfiguration mode when a 12.2 kbit/s AMR service is set up

Figure 2-2 Signaling procedure for fast reconfiguration mode when a 12.2 kbit/s AMR service is set up

2.3 BenefitsThe Fast Radio Bearer Setup feature provides the following benefits:

Reduces the RAB setup delay by about 100 ms to 300 ms when a UE initiates a single service and downlink SRBs are carried on the DCH

Reduces the RAB setup delay by about 100 ms to 500 ms when a UE initiates CS+PS combined services in which the CS service is established after the PS service and downlink SRBs are carried on the DCH

3 Technical Description

3.1 Fast Reconfiguration RequirementsWhen the RNC audits the NodeB capabilities, the NodeB sends the RNC an AUDIT RESPONSE message containing the Fast Reconfiguration Capability information element (IE). The Fast Reconfiguration Capability IE indicates the fast reconfiguration capability of the cell that the UE camps on. Upon receiving the AUDIT RESPONSE message, the RNC checks whether the cell supports fastreconfiguration mode. If the Fast Reconfiguration Capability IE is not contained in the AUDIT RESPONSE message, the cell does not support fast reconfiguration mode. During a handover, the Iur interface is involved. To avoid compatibility issues with devices provided by other vendors, the cell is considered to not support fast configuration mode.

To enable the Fast Radio Bearer Setup feature, you can select the following check boxes under the CellConnAlgoSwitch parameter in the RNC MML command ADD UCELLCONNALGOPARA :

SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH

SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH

MULTI_RAB_FAST_RB_SETUP_SWITCH

If the NodeB supports the WRFD-160106 Fast Radio Bearer Setup feature, the RNC can determine whether the NodeB uses fast reconfiguration mode during RB setup when the following conditions are met:

The loads of some resources in cells that all links in the active set connect to do not exceed the load reshuffling (LDR) threshold. These resources include CE resources, downlink code resources, and downlink power resources. For details about how to determine whether the loads exceed the LDR threshold, see Load Control Feature Parameter Description.

The NodeB that all links connect to supports fast reconfiguration mode, and the cell-level switch for the WRFD-160106 Fast Radio Bearer Setup feature is set to on.

Radio links (RLs) established by the UE do not involve those for the drift radio network controller (DRNC) cell.

The service initiated by the UE is a CS service, PS service, or CS+ PS combined services in which the CS service is set up after the PS service.

When a service is set up, not all SRBs are carried on the HSDPA channel before and after an RAB setup, and the established PS service is not carried on the DC-HSUPA channel.

The compressed mode or parameters of the compressed mode remain unchanged for the UE during the fast radio bearer setup.

The WRFD-160106 Fast Radio Bearer Setup feature supports the UE blacklist mechanism. After you run the ADD UIMEITAC command and select the SPECUSER_FAST_RBCFG_CMP_SWITCH check box under the SpecUserFunctionSwitch2 parameter to add IMEI TACs to UEs, these UEs cannot support this feature. IMEI is short for international mobile equipment identity and TAC isshort for type allocation code. With the UE blacklist mechanism, the radio access network (RAN) needs to obtain the IMEIs of UEs and matches the IMEIs with the configured TACs. For details about how to obtain the IMEI of a UE, see Terminal Black List Feature Parameter Description.

3.2 Fast Reconfiguration Signaling Procedure

The fast reconfiguration signaling procedure is as follows:

The RNC sends the NodeB a RADIO LINK RECONFIGURATION PREPARE message containing the Fast Reconfiguration Mode IE. The Fast Reconfiguration Mode IE indicates that the RB is set up in fast reconfiguration mode. For details, see section "Synchronised Radio Link Reconfiguration Preparation" in 3GPP 25.433 8.3.2.1.

Upon receiving the RADIO LINK RECONFIGURATION PREPARE message from the RNC, the NodeB sends the RNC a RADIO LINK RECONFIGURATION READY message containing the Fast Reconfiguration Permission IE if the following conditions are met:

The CPU usage of the NodeB does not exceed 65%.

The following resources are sufficient:

- CE resources

- Number of UEs

- Codes and signatures on the E-RGCH if HSUPA services are set up

If any of the preceding conditions is not met, the RADIO LINK RECONFIGURATION READY message does not contain the Fast Reconfiguration Permission IE and the RB cannot be set up on the new link using fast reconfiguration mode.

2.

Upon receiving a RADIO LINK RECONFIGURATION READY message containing the Fast Reconfiguration Mode IE from each link, the RNC sends the UE a RADIO BEARER SETUP message not containing the activation time and sends the NodeB a RADIO LINK RECONFIGURATION COMMIT message. Upon receiving the RADIO BEARER SETUP message, the UE activatesthe new link configurations.

If the RNC receives the RADIO LINK RECONFIGURATION READY message not containing the Fast Reconfiguration Mode IE from each link, the RNC uses synchronized reconfiguration mode and sends a RADIO BEARER SETUP message not containing the activation time to the UE.

3.

Upon receiving the RADIO LINK RECONFIGURATION COMMIT message, the NodeB uses both the original link configurations (such as uplink scrambling codes and link power) and new link configurations if the link supports fast reconfiguration mode.4.

After detecting the UE over the Uu interface or detecting the data sent by the UE, the NodeB removes the original link configurations and then sends the RNC a RADIO LINK RESTORE INDICATION message. Upon receiving the RADIO LINK RESTORE INDICATION message, the RNC activates new configurations.

If the RADIO LINK RESTORE INDICATION messages are reported by links at different time, the RNC delivers the RADIO LINK ACTIVATION COMMAND message containing the activation indication to each link while activating new link configurations. Upon receiving the RADIO LINK ACTIVATION COMMAND message, each link removes the original configurations and activates thenew configurations. Upon detecting the synchronization information of the UE, each link reports the RADIO LINK RESTORE INDICATION message to the RNC.

Figure 3-1 Fast reconfiguration signaling procedure

5.


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4 Related Features

Prerequisite Features

None

Mutually Exclusive Features

None

Impacted Features

WRFD-010701 Uplink Enhanced CELL_FACH

As the WRFD-010701 Uplink Enhanced CELL_FACH feature consumes common resources on the E-DCH and codes and signatures on the E-RGCH, the number of HSUPA UEs supported in a cell is reduced. During the HSUPA service setup, the Fast Radio Bearer Setup feature will also consume codes and signatures on the E-RGCH and a set of dedicated resources on theE-DCH. Therefore, if the Uplink Enhanced CELL_FACH feature is enabled, the fast RB setup application probability decreases in scenarios where the E-DCH is used before and after the RB is set up. The threshold for the fast RB setup application is 60% of the currently configured codes and signatures on the E-RGCH. If more than 60% of codes and signatures on the E-RGCH areconsumed, fast reconfiguration mode is not supported. Fast reconfiguration mode can be supported only after the proportion of consumed codes and signatures on the E-RGCH falls below 40%.

WRFD-160103 Terminal Black List

When the WRFD-160103 Terminal Black List feature is enabled, the RNC can add some UEs to the blacklist and prevent these UEs from using the Fast Radio Bearer Setup feature.

WRFD-140224 Fast CS Fallback Based on RIM

If the WRFD-140224 Fast CS Fallback Based on RIM feature is enabled during fast radio bearer setup, the delay in RB setup can be reduced after the Fast Radio Bearer Setup feature is activated, thereby reducing the access delay of CSFB UEs.

5 Network Impact

System Capacity

CE resources, code resources, and power resources

During fast reconfiguration, original resources need to be retained when new resources are occupied. Therefore, compared with synchronized reconfiguration, the fast reconfiguration consumes one more set of CE resources, code resources, and power resources from the time when a new link is successfully set up to the time when the new link configurations take effect.

Number of DCH, HSDPA, and HSUPA UEs

Compared with synchronized reconfiguration mode, fast reconfiguration mode retains both the original and new link configurations. This indicates that two UEs are carried on the NodeB.

CNBAP resources

The NodeB retains both the original and new link configurations when triggering a fast reconfiguration. As a result, fast reconfiguration mode doubles CNBAP resource consumption compared with synchronized reconfiguration mode. For details about the principles of CNBAP resource consumption, see NodeB Baseband Resource Management Feature Parameter Description.

Network Performance

The WRFD-160106 Fast Radio Bearer Setup feature reduces the RAB setup delay of a single service by about 100 ms to 300 ms and the RAB setup delay of CS+PS combined services in which the CS service is established after the PS service by about 100 ms to 500 ms. The following factors affect the reduction in delays:

SRB setup rate

Downlink channel type

Coverage area where a UE initiates a service

The better the coverage is, the more the delays are decreased.

Size of a data package of the RADIO BEARER SETUP message caused by the type of the service initiated by a UE

The larger the data package size is, the less the delays are decreased.

Length of a data package of the RADIO BEARER SETUP message caused by the type of the service initiated by a UE

In addition, compared with synchronized reconfiguration mode, the duration from the time that the RNC sends the RADIO BEARER SETUP message to the time that the UE receives the message is longer and the sending success rate is higher in weak coverage areas because the UE can activate new link configurations upon receiving the RADIO BEARER SETUP message. As a result, theRAB setup success rate increases. However, the RAB setup success rate and the reduction in the RAB setup delay depend on the coverage.

Uplink data frames will not be sent if the UL FP Mode parameter of the typical signaling radio bearer (SRB) is set to SILENT and no transport format indicator (TFI) exists for SRBs over the Iub interface. In this case, only the uplink traffic over the Iub interface is reduced.

6 Engineering Guidelines

6.1 When to Use Fast Radio Bearer Setup

The WRFD-160106 Fast Radio Bearer Setup feature can be enabled in the following scenarios:

The CPU usage of the NodeB may exceed 65%, which can be observed through the VS.BRD.CPULOAD.MEAN counter. In this case, the NodeB cannot support this feature in corresponding periods. Therefore, it is recommended that this feature be not enabled for cells under the NodeB in this scenario.

Cells with light loads

If the values of the VS.LCC.LDR.Num.DLCode, VS.LCC.LDR.Num.ULCE, and VS.LCC.LDR.Num.DLPower counters are 0, the load in a cell is light. The values of these counters vary depending on the following parameters: CellLdrSfResThd(BSC6900,BSC6910), UlLdrCreditSfResThd(BSC6900,BSC6910), UlLdrTrigThd(BSC6900,BSC6910), andDlLdrTrigThd(BSC6900,BSC6910). If the values of these parameters are set to larger values, the values of those counters approximate to 0. If the default values of these parameters are used, those counters can be used to accurately determine the load in a cell. Therefore, it is recommended that the default values of these parameters be used.

Base stations with low IP path jitters over the Iub interface: The value of the VS.IPPATH.RTP.AverageJitter counter is less than 80 ms, and the values of the VS.IPPM.Forward.JitterStandardDeviation and VS.IPPM.Back.JitterStandardDeviation counters are small.

High-speed coverage areas (150 km/h or greater)

If this feature needs to be enabled in only some cells, it is recommended that these cells be located in a continuous qualified area.

You can run the LST UTYPSRBBASIC command to query the setting of the UL FP Mode parameter. If it is not set to SILENT, it is recommended that it be set to SILENT.

6.2 Required InformationBefore enabling this feature, collect the following information to determine whether it is appropriate to enable this feature and evaluate gains produced by this feature.

Counter Name Counter Description NE Description

VS.LCC.LDR.Num.DLCode Number of Times a Cell Is in LDR State Due to DL Code Resource Congestion for Cell RNC These counters measure the resource usage in a cell. If they are not measured, the cell load islight.

VS.LCC.LDR.Num.ULCE Number of Times a Cell Is in LDR State Due to UL CE Resource Congestion for Cell RNC

VS.LCC.LDR.Num.DLPower Number of Times a Cell Is in LDR State Due to DL Power Congestion for Cell RNC

VS.IPPATH.RTP.AverageJitter Delay Jitter at Local End of IP Path RNC This counter measures the IP path's delay jitter over the Iub interface. Its value should be less than80 ms.

VS.IPPM.Forward.JitterStandardDeviation T7826:Forward Jitter Standard Deviation of Transmission Resource Pool IPPM RNC These counters measure the IP path's jitter over the Iub interface. A smaller value indicates asmaller delay jitter.These counters also measure the base station's jitter. For details about the principles of IP PMdetection, see IP Performance Monitor Feature Parameter Description.

VS.IPPM.Back.JitterStandardDeviation T7679:Backward Jitter Standard Deviation of IPPM RNC

VS.RAB.AttEstabCS.Conv Number of CS Conversational RAB Establishment Requests for Cell RNC These counters are used to evaluate whether congestion or an admission failure occurs andevaluate the impact of this feature on resource consumption in a cell based on access attempts ofdifferent services and resources consumed during the setups of these services.VS.AttEstabCS.PSinDCH Number of CS Service Setup Attempts of UEs with an Ongoing PS Service in the CELL_DCH state for Cell RNC

VS.RAB.AttEstabPS.Bkg The RAB setup attempts for a PS service in a cell can be calculated using the following formula:RAB setup attempts for a PS service in a cell = VS.RAB.AttEstabPS.Bkg + VS.RAB.AttEstabPS.Int + VS.RAB.AttEstabPS.Conv +VS.RAB.AttEstabPS.Str

RNC

VS.RAB.AttEstabPS.Int

VS.RAB.AttEstabPS.Conv

VS.RAB.AttEstabPS.Str

6.3 Deployment

6.3.1 Requirements

Other Features

For details, see chapter 4 Related Features.

Hardware

The 3900 series base stations must be configured with the WBBPb, WBBPd, WBBPf, or UBBPd board.

The following base stations do not support this feature:

BTS3812E

BTS3812A

BTS3812AE

DBS3800 series base stations

3900 series base stations in which the WBBPa board carries resource groups established by cells

License

None

6.3.2 Data Preparation

Table 6-1 lists the data that needs to be prepared before the deployment of this feature.

Table 6-1 Data that needs to be prepared

Parameter Name Parameter ID Setting Notes Data Source

Fast RB Setup Switch for a Single CS RAB CellConnAlgoSwitch=SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH Determine whether a cell meets the conditions for enabling this feature based on the information collected before deployment. BSC internal planning

Fast RB Setup Switch for a Single PS RAB CellConnAlgoSwitch=SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH Determine whether a cell meets the conditions for enabling this feature based on the information collected before deployment. BSC internal planning

Fast RB Setup Switch for Combined Services CellConnAlgoSwitch=MULTI_RAB_FAST_RB_SETUP_SWITCH Determine whether a cell meets the conditions for enabling this feature based on the information collected before deployment. BSC internal planning

Special User Function Switch2 SpecUserFunctionSwitch2=SPECUSER_FAST_RBCFG_CMP_SWITCH Blacklist UEs that do not support this feature based on UE capabilities. Network plan

6.3.3 Activation

NOTE:


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Based on the network plan, you need to enable the Fast Radio Bearer Setup feature for the corresponding service type. If the Fast Radio Bearer Setup feature needs to be enabled only for a single CS service, enable the Fast Radio Bearer Setup feature for this service type.

If a type of UEs does not support the Fast Radio Bearer Setup feature in a network, blacklist this type of UEs.


If the UL FP Mode parameter is not set to SILENT for a typical SRB, run the RNC MML command MOD UTYPSRBBASIC to change this parameter to SILENT. You can run the RNC MML command LST UTYPSRBBASIC to query this parameter.1.

Set cell-level parameters to enable the Fast Radio Bearer Setup feature.

Initial configuration scenario

Run the RNC MML command ADD UCELLCONNALGOPARA, and set SW for Cell-level Conn-oriented Algorithm based on the service type.

To enable the fast RB setup switch for a single CS RAB, select the SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH check box.

To enable the fast RB setup switch for a single PS RAB, select the SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH check box.

To enable the fast RB setup switch for combined services where a CS service is set up after the PS service, select the MULTI_RAB_FAST_RB_SETUP_SWITCH check box.

Reconfiguration scenario

Run the RNC MML command MOD UCELLCONNALGOPARA, and set SW for Cell-level Conn-oriented Algorithm based on the service type.

To enable the fast RB setup switch for a single CS RAB, select the SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH check box.

To enable the fast RB setup switch for a single PS RAB, select the SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH check box.

To enable the fast RB setup switch for combined services where a CS service is set up after the PS service, select the MULTI_RAB_FAST_RB_SETUP_SWITCH check box.

2.

(Optional) Run the RNC MML command ADD UIMEITAC and set parameters for UEs with compatibility issues to prevent these UEs from using the Fast Radio Bearer Setup feature. In this step, set TAC_FUNC to Special_User_Enhance , set the TAC and Description parameters to appropriate values, and select the SPECUSER_FAST_RBCFG_CMP_SWITCH check box underthe Special User Function Switch parameter.

3.


//Modifying the UL FP Mode parameter for a typical SRBMOD UTYPSRBBASIC: SrbIndex=1, UlFpMode=SILENT;MOD UTYPSRBBASIC: SrbIndex=2, UlFpMode=SILENT;MOD UTYPSRBBASIC: SrbIndex=3, UlFpMode=SILENT;MOD UTYPSRBBASIC: SrbIndex=4, UlFpMode=SILENT;//Setting cell-level parameters to enable the Fast Radio Bearer Setup featureADD UCELLCONNALGOPARA: CellId=1, CellConnAlgoSwitch= SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH-1&SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH-1&MULTI_RAB_FAST_RB_SETUP_SWITCH-1;//(Optional) Setting parameters for UEs with compatibility issues to prevent these UEs using the Fast Radio Bearer Setup feature ADD UIMEITAC: TAC_FUNC=Special_User_Enhance, TAC=12345678, Description="Smart Phone", SpecUserFunctionSwitch2=SPECUSER_FAST_RBCFG_CMP_SWITCH-1;


NOTE:

When configuring the Fast Radio Bearer Setup feature on the CME, perform a single configuration first, and then perform a batch modification if required. Configure the parameters of a single object before a batch modification. Perform a batch modification before logging out of the parameter setting interface.

Configure a single object on the CME.

Set parameters on the CME according to the operation sequence in Table 6-2. For instructions on how to perform the CME single configuration, see CME Single Configuration Operation Guide.

1.

(Optional) Modify objects in batches on the CME. (CME batch modification center)

To modify objects in batches, click on the CME to start the batch modification wizard. For instructions on how to perform a batch modification through the CME batch modification center, press F1 on the wizard interface to obtain online help.

2.

Table 6-2 Configuring the parameters on the CME

SN MO NE Parameter Name Parameter ID Configurable in CME Batch Modification Center

1 UTYPSRBBASIC RNC UL FP Mode UlFpMode(BSC6900,BSC6910) Yes

2 UCELLCONNALGOPARA

NOTE:

This MO is used to configure cell-level parameters to enable the Fast Radio Bearer Setup feature.

RNC SW for Cell-level Conn-oriented Algorithm CellConnAlgoSwitch Yes

3(Optional) UIMEITAC RNC The function of the TAC TAC_FUNC No

TAC TAC

Description Description

Special User Function Switch2 SpecUserFunctionSwitch2

6.3.4 Activation Observation

Observe the following counters measuring fast radio bearer setup attempts to check whether the Fast Radio Bearer Setup feature has taken effect:

VS.RAB.AttEstabCS.FastSetup

VS.RAB.AttEstabPS.FastSetup

VS.MultiRAB.AttEstabCS.FastSetup

If the values of the preceding counters are not zero, this feature has taken effect.

6.3.5 Deactivation


Set cell-level parameters to disable the Fast Radio Bearer Setup feature.

Run the RNC MML command MOD UCELLCONNALGOPARA, and set SW for Cell-level Conn-oriented Algorithm based on the service type.

To disable the fast RB setup switch for a single CS RAB, deselect the SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH check box.

To disable the fast RB setup switch for a single PS RAB, deselect the SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH check box.

To disable the fast RB setup switch for combined services where a CS service is set up after the PS service, deselect the MULTI_RAB_FAST_RB_SETUP_SWITCH check box.

1.

(Optional) Set parameters for UEs with compatibility issues to remove these UEs from the blacklist for the Fast Radio Bearer Setup feature.

In initial configuration scenarios, run the RNC MML command ADD UIMEITAC . In this step, set TAC_FUNC to Special_User_Enhance , set the TAC and Description parameters to appropriate values, and deselect the SPECUSER_FAST_RBCFG_CMP_SWITCH check box under the SpecUserFunctionSwitch2 parameter.

2.


//Setting cell-level parameters to disable the Fast Radio Bearer Setup feature.MOD UCELLCONNALGOPARA: CellId=1, CellConnAlgoSwitch= SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH-0&SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH-0&MULTI_RAB_FAST_RB_SETUP_SWITCH-0;

//(Optional) Setting parameters for UEs with compatibility issues to remove these UEs from the blacklist for the Fast Radio Bearer Setup feature.MOD UIMEITAC: TAC_FUNC=Special_User_Enhance, TAC=12345678, Description="Smart Phone", SpecUserFunctionSwitch2=SPECUSER_FAST_RBCFG_CMP_SWITCH-0;


NOTE:

When configuring the Fast Radio Bearer Setup feature on the CME, perform a single configuration first, and then perform a batch modification if required. Configure the parameters of a single object before a batch modification. Perform a batch modification before logging out of the parameter setting interface.

Configure a single object on the CME.

Set parameters on the CME according to the operation sequence in Table 6-3. For instructions on how to perform the CME single configuration, see CME Single Configuration Operation Guide.

1.

(Optional) Modify objects in batches on the CME. (CME batch modification center)

To modify objects in batches, click on the CME to start the batch modification wizard. For instructions on how to perform a batch modification through the CME batch modification center, press F1 on the wizard interface to obtain online help.

2.

Table 6-3 Configuring the parameters on the CME

SN MO NE Parameter Name Parameter ID Configurable in CME Batch Modification Center

1 UCELLCONNALGOPARA

NOTE:

This MO is used to configure cell-level parameters to enable the Fast Radio BearerSetup feature.

RNC SW for Cell-level Conn-oriented Algorithm CellConnAlgoSwitch Yes

2 (Optional) UIMEITAC RNC The function of the TAC TAC_FUNC No

TAC TAC

Description Description

Special User Function Switch2 SpecUserFunctionSwitch2

6.4 Performance Monitoring

After the Fast Radio Bearer Setup feature is enabled, the traffic and RTWP are stable on the network. You can observe the following counters to check the traffic and RTWP:

VS.RAB.AttEstab.AMR

VS.RAB.AttEstabPS.Conv

VS.RAB.AttEstabPS.Str

VS.RAB.AttEstabPS.Int

VS.RAB.AttEstabPS.Bkg

VS.MeanRTWP

NOTE:

The values of the first five counters change between –5% and +5%.

The value of the last counter changes between –1 dB and +1 dB.

In addition, you can observe the following KPIs to evaluate gains produced by the Fast Radio Bearer Setup feature and network impacts of this feature.

Delay

You can perform the drive test on a single UE to check the reduction in the call setup delay. The call setup delay equals to the duration from the time the UE sends the RRC CONNECTION REQUEST message (an RRC message) to the time the UE receives the ALERTING message (an NAS message) from the CN.

You can observe the following counters to check the reduction in delays on the network. The reduction in delays on the network is less than the reduction in the call setup delay. This is because the measurement of delays on the network is less accurate than that of the call setup delay on a single UE, and because traffic is measured as the average of all UE traffic.

VS.AMR.Estab.MeanTime

VS.PSR99.Estab.MeanTime

VS.HSDPA.Estab.MeanTime

VS.HSUPA.Estab.MeanTime

RAB Setup Success Rate

After this feature is enabled, the RAB setup success rates increase. The RAB setup success rates of AMR services and PS services can be calculated using the following formulas:

RAB setup success rate of AMR services = (VS.RAB.SuccEstabCS.AMR/VS.RAB.AttEstab.AMR) x 100%

RAB setup success rate of PS services = [(VS.RAB.SuccEstabPS.Conv + VS.RAB.SuccEstabPS.Str + VS.RAB.SuccEstabPS.Int + VS.RAB.SuccEstabPS.Bkg)/(VS.RAB.AttEstabPS.Conv + VS.RAB.AttEstabPS.Str + VS.RAB.AttEstabPS.Int + VS.RAB.AttEstabPS.Bkg )] x 100%

Congestion and RRC Connection Setup Success Rate

You can observe the following counters to obtain the number of times congestion occurs:

VS.LCC.LDR.Num.DLPower

VS.LCC.LDR.Num.ULPower

VS.LCC.LDR.Num.DLCode

VS.LCC.LDR.Num.ULCE

VS.LCC.LDR.Num.DLCE

VS.LCC.LDR.Num.ULIub

VS.LCC.LDR.Num.DLIub

You can observe the following counters to obtain the congestion time :

VS.LCC.LDR.Time.ULPower

VS.LCC.LDR.Time.DLPower

VS.LCC.LDR.Time.DLCode

VS.LCC.LDR.Time.ULCE

VS.LCC.LDR.Time.DLCE

VS.LCC.LDR.Time.ULIub

VS.LCC.LDR.Time.DLIub

If the number of times congestion occurs increases, you need to observe the impact of this feature on RRC connection setup success rates. The RRC connection setup success rates of CS services and PS services can be calculated using the following formulas:

RRC connection setup success rate of CS services = (RRC.SuccConnEstab.OrgConvCall + RRC.SuccConnEstab.TmConvCall + RRC.SuccConnEstab.EmgCall)/(RRC.AttConnEstab.OrgConvCall + RRC.AttConnEstab.TmConvCall + RRC.AttConnEstab.EmgCall) x 100%

RRC connection setup success rate of PS services = (RRC.SuccConnEstab.OrgBkgCall + RRC.SuccConnEstab.OrgInterCall + RRC.SuccConnEstab.TmBkgCall + RRC.SuccConnEstab.TmItrCall + RRC.AttConnEstab.OrgHhPrSig + RRC.AttConnEstab.TmHhPrSig)/(RRC.AttConnEstab.OrgBkgCall + RRC.AttConnEstab.OrgInterCall + RRC.AttConnEstab.TmBkgCall +RRC.AttConnEstab.TmInterCall + RRC.SuccConnEstab.OrgHhPrSig + RRC.SuccConnEstab.TmHhPrSig) x 100%


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Traffic

After the value of the UL FP Mode parameter of a typical SRB is modified, the value of the VS.SRNCIubBytesDCHSig.Rx counter decreases. If RBs are set up on the E-DCH, the value of the VS.SRNCIubBytesEDCHSig.Rx counter will decrease.

6.5 Parameter Optimization

If the number of consumed codes and signatures on the E-RGCH reaches 60% of the currently configured codes and signatures on the E-RGCH and the E-DCH is used before and after the RB is set up, few RBs can be set up in fast reconfiguration mode. In this case, it is recommended that you run the MOD UCELLHSUPA command to add the number of codes on the E-RGCH or E-HICH. Acode on the E-RGCH or E-HICH corresponds to 20 codes and signatures on the E-RGCH. For example, you can run the following command to change the number of codes on the E-RDCH or E-HICH from 1 to 2:

MOD UCELLHSUPA: CellId=1111, ErgchEhichCodeNum=2

6.6 TroubleshootingNone

7 Parameters

Table 7-1 Parameter description

Parameter ID NE MML Command Feature ID Feature Name Description

CellConnAlgoSwitch BSC6900 ADDUCELLCONNALGOPARAMODUCELLCONNALGOPARA

WRFD-010202 UE State inConnectedMode(CELL-DCH,CELL-PCH,URA-PCH,CELL-FACH)

Meaning: Switch for controlling the connection-oriented cell-level algorithm. When this switch is selected, the corresponding algorithm is enabled. When this switch is not selected, the corresponding algorithm is disabled. 1. KQI_APP_CTRL (measurementof PS service quality): Whether to enable the PS service quality measurement for UEs admitted to this cell. When this switch is turn on, the PS service quality measurement for UEs admitted to this cell is enhanced. When this switch is turned off, the PSservice quality measurement in the preceding case is not enhanced. 2. RRC_CONN_CU_DSCR_SWITCH (DSCR Option for RRC Connection Setup and Cell Update): Whether to follow the Directed Signalling Connection Re-establishment (DSCR)procedure to quickly set up a new RRC connection when the RNC receives a CELL UPDATE message from a UE while waiting for an RRC CONNECTION SETUP COMPLETE message from the UE. When this switch is turned on, the RNC follows theDSCR procedure to quickly set up a new RRC connection for the UE in the preceding scenario. When this switch is turned off, the RNC does not follow the DSCR procedure to quickly set up a new RRC connection for the UE in the preceding scenario butwaits for the RRC connection setup procedure to fail. 3. SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH(Fast RB Setup Switch for a Single CS RAB): Whether to enable the Fast Radio Bearer Setup feature for a single CS radio access bearer (RAB) at thecell level. When this switch is set to on, the fast RB reconfiguration procedure is triggered to set up the RB in non-DRD procedures for UEs processing CS services in the CELL_DCH state. During the reconfiguration, the RB setup message does not includethe activation time. The UE activates the new configuration immediately after receiving the RB setup message. When this switch is set to off, the synchronous RB reconfiguration procedure is triggered to set up the RB in non-DRD procedures for UEsprocessing CS services in the CELL_DCH state. During the reconfiguration, the RB setup message includes the activation time. The UE activates the new configuration when the activation time arrives. 4.SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH(Fast RB Setup Switch for a Single PS RAB): Whether to enable the Fast RB Setup feature for a single PS RAB at the cell level. When this switch is set to on, the fast RB reconfiguration procedure istriggered to set up the RB in non-DRD procedures for UEs processing PS services in the CELL_DCH state. During the reconfiguration, the RB setup message does not include the activation time. The UE activates the new configuration immediately afterreceiving the RB setup message. When this switch is set to off, the synchronous RB reconfiguration procedure is triggered to set up the RB in non-DRD procedures for UEs processing PS services in the CELL_DCH state. During the reconfiguration, the RBsetup message includes the activation time. The UE activates the new configuration when the activation time arrives. 5. MULTI_RAB_FAST_RB_SETUP_SWITCH(Fast RB Setup Switch for Combined Services): Whether to enable the Fast RB Setupfeature for combined services at the cell level. When this switch is set to on, the fast RB reconfiguration procedure is triggered to set up the RB in non-DRD procedures for a CS service if the UE is processing PS services in the CELL_DCH state. During thereconfiguration procedure, the RB setup message does not include the activation time. The UE activates the new configuration immediately after receiving the RB setup message. When this switch is set to off, the synchronous RB reconfiguration procedureis triggered to set up the RB in non-DRD procedures for a CS service if the UE is processing PS services in the CELL_DCH state. During the reconfiguration procedure, the RB setup message includes the activation time. The UE activates the newconfiguration when the activation time arrives.GUI Value Range: KQI_APP_CTRL, RRC_CONN_CU_DSCR_SWITCH, SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH, SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH, MULTI_RAB_FAST_RB_SETUP_SWITCHUnit: NoneActual Value Range: KQI_APP_CTRL, RRC_CONN_CU_DSCR_SWITCH, SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH, SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH, MULTI_RAB_FAST_RB_SETUP_SWITCHDefault Value: KQI_APP_CTRL:0,RRC_CONN_CU_DSCR_SWITCH:0,SINGLE_CS_RAB_FAST_RB_SETUP_SWITCH:0,SINGLE_PS_RAB_FAST_RB_SETUP_SWITCH:0,MULTI_RAB_FAST_RB_SETUP_SWITCH:0

SpecUserFunctionSwitch2 BSC6900 ADD UIMEITACMOD UIMEITAC

None None Meaning: 1)SPECUSER_CSPSR99_DL_BRLIMITED_SWITCH Whether to limit the DL peak rate to 8 kbit/s on the DCH for the PS service in CS+PS combined services of a special UE. 1: This switch is turned on, the DL peak rate on the DCH is limited to8 kbit/s. 0: This switch is turned off, there is no limit on the DL peak rate on the DCH. 2)SPECUSER_AMR_RATE_CHG_SWITCH Whether to refuse to adjust the data rate of special CS UEs. 1: This switch is turned on, the RNC does not adjust the uplinkdata rate of special CS UEs. 0: This switch is turned off, the RNC adjusts the uplink data rate of special CS UEs when required. 3)SPECUSER_STATIC_RELOC_DISABLED_SWITCH 1: This switch is turned on, Special UEs are not allowed to performUE-not-involved relocation. 0: This switch is turned off, There is no limitation on special UEs. 4)SPECUSER_FAST_RBCFG_CMP_SWITCH Whether to enable the Fast Radio Bearer Setup feature for UEs using a certain type approval code (TAC). 1: Thisswitch is turned on, and special users do not support the Fast Radio Bearer Setup feature. 0: This switch is turned off, and special users support the Fast Radio Bearer Setup feature. 5)SPECUSER_CSPS_HHO_RELOC_CMP_SWITCH Whether specialUEs that are processing CS+PS combined services support the combined hard handover and SRNS relocation. 1: This switch is set to on. Special UEs that are processing CS+PS combined services do not support the combined hard handover and SRNSrelocation. If the PS service included in the CS+PS combined services is a BE service, the RNC releases the special UE's PS connection and then triggers a combined hard handover and SRNS relocation for CS services. 0: This switch is set to off. SpecialUEs that are processing CS+PS combined services support the combined hard handover and SRNS relocation.GUI Value Range: SPECUSER_CSPSR99_DL_BRLIMITED_SWITCH, SPECUSER_AMR_RATE_CHG_SWITCH, SPECUSER_STATIC_RELOC_DISABLED_SWITCH, SPECUSER_FAST_RBCFG_CMP_SWITCH,SPECUSER_CSPS_HHO_RELOC_CMP_SWITCHUnit: NoneActual Value Range: SPECUSER_CSPSR99_DL_BRLIMITED_SWITCH, SPECUSER_AMR_RATE_CHG_SWITCH, SPECUSER_STATIC_RELOC_DISABLED_SWITCH, SPECUSER_FAST_RBCFG_CMP_SWITCH,SPECUSER_CSPS_HHO_RELOC_CMP_SWITCHDefault Value:SPECUSER_CSPSR99_DL_BRLIMITED_SWITCH:0,SPECUSER_AMR_RATE_CHG_SWITCH:0,SPECUSER_STATIC_RELOC_DISABLED_SWITCH:0,SPECUSER_FAST_RBCFG_CMP_SWITCH:0,SPECUSER_CSPS_HHO_RELOC_CMP_SWITCH:0

UlFpMode BSC6900 ADD UTYPSRBBASICMOD UTYPSRBBASIC

WRFD-010510 3.4/6.8/13.6/27.2KbpsRRCConnection andRadio AccessBearerEstablishmentand Release

Meaning: This parameter specifies the UL FP mode of this type of SRB. For details of normal mode and silent mode, refer to section 5.1.1 of the 3GPP TS 25.427. This parameter is an advanced parameter. To modify this parameter, contact HuaweiCustomer Service Center for technical support.GUI Value Range: NORMAL, SILENTUnit: NoneActual Value Range: NORMAL, SILENTDefault Value: None

UlFpMode BSC6910 ADD UTYPSRBBASICMOD UTYPSRBBASIC

WRFD-010510 3.4/6.8/13.6/27.2KbpsRRCConnection andRadio AccessBearerEstablishmentand Release

Meaning: This parameter specifies the UL FP mode of this type of SRB. For details of normal mode and silent mode, refer to section 5.1.1 of the 3GPP TS 25.427. This parameter is an advanced parameter. To modify this parameter, contact HuaweiCustomer Service Center for technical support.GUI Value Range: NORMAL, SILENTUnit: NoneActual Value Range: NORMAL, SILENTDefault Value: None

TAC_FUNC BSC6900 ADD UIMEITACMOD UIMEITACRMV UIMEITAC

WRFD-160103WRFD-020500

Terminal BlackListEnhanced FastDormancy

Meaning: The function of the TAC.If Fast_Dormancy is selected, the TAC specifies the UEs that are enabled with the Fast Dormancy feature; if HSDPA_RB_Setup_Cmp_CRC is selected, the TAC specifies that the UEs want to establish services onHSDPA, however, the RNC sets up services on the DCH, and retries on HSDPA later; if Special_User_Enhance is selected, the TAC specifies the UEs that are enabled with the Special User Enhance feature.GUI Value Range: Fast_Dormancy, HSDPA_RB_Setup_Cmp_CRC, Special_User_EnhanceUnit: NoneActual Value Range: Fast_Dormancy, HSDPA_RB_Setup_Cmp_CRC, Special_User_EnhanceDefault Value: None

TAC BSC6900 ADD UIMEITACMOD UIMEITACRMV UIMEITAC

WRFD-020500 Enhanced FastDormancy

Meaning: Type Allocation Code (TAC) is proportion of the International Mobile Station Equipment Identity (IMEI) and represent the first eight digits of the IMEI. TAC is used to differentiate between the MSs of different models. This parameter consists of aneight digit string. If the string is less than eight digits, the system fills the higher orders with 0s to achieve an eight digit string.GUI Value Range: 0~99999999Unit: NoneActual Value Range: 0~99999999Default Value: None

Description BSC6900 ADD UIMEITACMOD UIMEITAC

WRFD-020500 Enhanced FastDormancy

Meaning: Description UE type.GUI Value Range: 1~64 length of byteUnit: NoneActual Value Range: 1~64 length of byteDefault Value: None

8 Counters

There are no specific counters associated with this feature.

9 Glossary

For the acronyms, abbreviations, terms, and definitions, see Glossary.

10 Reference Documents

Load Control Feature Parameter Description1.

Terminal Black List Feature Parameter Description2.

NodeB Baseband Resource Management Feature Parameter Description3.

IP Performance Monitor Feature Parameter Description4.


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