SPD Huawei eRAN3.0 CSFB Feature Introduction 20120529 a 1.0

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Text of SPD Huawei eRAN3.0 CSFB Feature Introduction 20120529 a 1.0

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Huawei eRAN3.0 CSFB Feature Introductionwww.huawei.com

HUAWEI TECHNOLOGIES Co., Ltd.

HUAWEI Confidential

Huawei CSFB Feature RoadmapReleased

CSFB to UTRAN PS HO PS redirection

Flash CSFB to UTRAN Flash CSFB to GERAN CSFB to GERAN CCO with NACC

CSFB to UTRAN with LAI CSFB to GERAN with LAI

Adaptive blind CSFB CSFB Steering CSFB with eMPS

Planned Planning

CSFB to GERAN PS HO PS redirection CCO

CSFB to CDMA2000 1xRTT

eRAN2.1

eRAN2.2

eRAN3.0

Next Evolutions

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Chapter OneFeature Introduction

Architecture and functionalities

Mobile Originating callMobile Terminating call SMS

Emergency call

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Page 3

CSFB: brief introduction

Circuit Switched Fallback (CSFB, 3GPP TS23.272) The CS fallback in EPS enables the provisioning of voice and other CS-domain services (e.g. SMS/ LCS) by reuse of CS infrastructure when the UE is served by E-UTRAN.

This function is only available in case E-UTRAN coverage is overlapped by either GERAN coverage or UTRAN coverage.

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Page 4

CSFB: Architecture and functionalitiesNeed to be R8 ready Maintaining SGs association with MME A Iu-cs GERAN Gb Gs SGSN MSC/VLR for the mobility management and paging procedures between EPS and CS domain. C/D Gr UTRAN Multi-mode G/U/L CSFB capable Support of procedures: Combined EPS/IMSI Attach, Update, Detach. Iu-ps S3 S12 HSS/HLR Deriving a VLR number and LAI from the TAI of the current cell, or using a default VLR number and LAI. Maintaining SGs association with MSC/VLR for EPS/IMSI Attached UE Triggering paging to eNodeB (when MSC-S pages the UE) Initiating IMSI Detach at EPS Detach

SGsS6a

S4MME S11 S1-MME S5 S1-U

PCRF

S7

Rx Internet / intranet / Operators & 3rd Party Applications

SGiPDN-GW

G/U/L handset

E-UTRAN

S-GW Forwarding paging request for CS domain to the UE. Directing the UE to the target CS capable cell. (PS HO/redirection with or without SIBs).

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Page 5

CSFB: Mobile Originating call7.IAM6.Initiate voice call MSC-VLR SGSN 3G LTE MME1. Ext Service RQ (CSFB indicator) SGs

Inter-system change

NodeB

RNC

HSS/HLR

3.optional measurement eNodeB 5. eNB direct the UE to G/U

SAE-GW

RAT change (and selection) is under full network control (eNodeB triggers the RAT change towards to 2G/3G based on the UEs capability\measurement\SPID indication from MME.)HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 6

CSFB: Mobile Terminating call9.Voice call establishment

1.IAM

NodeB

RNC SGSN

MSC-VLR

HSS/HLR

Inter-system change

3G LTE

SGs

MME

2. Paging RQ (Domain indicator: CS) 3. Ext Service RQ (CSFB indicator)

5.measurement eNodeB SAE-GW

7. eNB direct the UE to G/U

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Page 7

CSFB to UMTS (PS HO)MO callUE eNodeB RNC MME MSC SGSN

MT callUE eNodeB RNC MME MSC SGSN S-GW P-GW

1. Extended Service Request (containing a CS Fallback Indicator)

1.Paging Request Paging

2. S1-AP Message (containing a CS Fallback Indicator) S1-AP Response Message

2.Extended Service Request (containing a CS Fallback Indicator) Service Request

3. Optional measurement report

3. S1-AP message with CS Fallback indicator4. PS handover preparation phase Handover Command Handover Command

4. Subsequent procedure similar to that in a mobile-originated case, with the CS call establishment procedure replaced with a Paging Response message

5.CS call establishment procedure with LAU or combined RAU/LAU 6.PS handover execution phase

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Page 8

CSFB to UMTS (PS RRC Redirection w/o RIM)MO call (R9: with RIM)UE eNodeB RNC MME MSC SGSNUE

MO call (R8: without RIM)eNodeB RNC MME MSC SGSN

1.Extended Service Request (containing a CS Fallback Indicator) 2.S1-AP Message with CS Fallback Indicator S1-AP Reponse Message 3.Optional measurement report

1.Extended Service Request (containing a CS Fallback Indicator)

2.S1-AP Message with CS Fallback Indicator S1-AP Reponse Message 3.Optional measurement report

4. RRC Connection Release with UTRAN frequency\cell id\cell System information S1 UE context release 5. LAU, combined RAU/LAU, or RAU and LAU

4. RRC Connection Release with UTRAN frequency S1 UE context release 5. LAU, combined RAU/LAU, or RAU and LAU PS Suspend 6.CS call establishment procedure

PS Suspend6.CS call establishment procedure

*MT calls procedure is same.HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 9

CSFB to GERAN (PS HO)MO callUE eNodeB BSC MME MSC SGSN S-GW P-GWUE eNodeB RNC BSC MME MSC SGSN S-GW P-GW

MT call

1. Extended Service Request (containing a CS Fallback Indicator) 2. S1-AP Message (containing a CS Fallback Indicator)

1.Paging Request Paging

S1-AP Response Message2.Extended Service Request (containing a CS Fallback Indicator)

3. Optional measurement report 4a. PS handover preparation phase Handover Command Handover Command 4b.Suspend Update Bearers 5.CS call establishment procedure with LAU or combined RAU/LAU 6.PS handover execution phase4. Subsequent procedure similar to that in a mobile-originated case, with the CS call establishment procedure replaced with a Paging Response message Service Request 3. S1-AP message with CS Fallback indicator

In case GERAN or UE cant support DTM (Dual transfer Mode) the PS service will be suspended

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Page 10

CSFB to GERAN (PS RRC Redirection w/o RIM)MO call (R9: with RIM)UE eNodeB BSC MME MSC SGSN

MO call (R8: without RIM)UE eNodeB BSC MME MSC SGSN

1.Extended Service Request (containing a CS Fallback Indicator) 2.S1-AP Message (containing a CS Fallback Indicator) S1-AP Reponse Message 3.Optional measurement report

1.Extended Service Request (containing a CS Fallback Indicator) 2.S1-AP Message (containing a CS Fallback Indicator) S1-AP Reponse Message 3.Optional measurement report

4. RRC Connection Release with GERAN frequency group\Cell id\Cell system information S1 UE context release 5.LAU, combined RAU/LAU, or RAU and LAU 6.Suspend 7.CS call establishment procedure

4. RRC Connection Release with GERAN frequency group S1 UE context release 5.LAU, combined RAU/LAU, or RAU and LAU 6.Suspend 7.CS call establishment procedure

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Page 11

CSFB to GERAN (CCO w/o RIM)MO call (w/o RIM)UE eNodeB BSC MME MSC SGSN

1.Extended Service Request (containing a CS Fallback Indicator) 2.S1-AP Message (containing a CS Fallback Indicator) S1-AP Response Message 3.Optional measurement report

4. MobilityFromEUTRACommand (CCO optionally with NACC)5. S1 UE context release 6.LAU, combined RAU/LAU, or RAU and LAU 7.Suspend 8.CS call establishment procedure

In case GERAN or UE cant support DTM (Dual transfer Mode) the PS service will be suspended

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Page 12

CSFB to UTRAN: Three mechanisms

R8 PS Handover: base on the inter-RAT PS handover procedures

R8 PS redirection: RRC release with redirectedCarrierInfoIE to UE

R9 PS redirection: RRC release with a carrier frequency and UTRAN cells SIBs acquired by RIM procedures before CSFB.

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Page 13

CSFB to GERAN: Four mechanisms

R8 PS Handover: base on the inter-RAT PS handover procedures

R8 PS redirection: RRC release with redirectedCarrierInfoIE to UER9 PS redirection: RRC release with a carrier frequency list and cells SIBs acquired by RIM procedures before CSFB.

R8 CCO with NACC: HandoverCommand With target cell and SI

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Page 14

CSFB: SMS UE is EPS/IMSI attached and the CS access domain is chosen by the UE and/or the home PLMN for delivering short messages.

UE

MME

MSC

HLR

SMSC

1.EPS/IMSI attach 2.UE triggered Service Request 3. Uplink NAS Transport 4.Uplink Unitdata 5.Forward Short Message 4a.Downlink Unitdata 4a.Downlink NAS Transport 6.Delivery report

SMS support is based on the connectionless SGs reference point between the MME and the MSC Server and use of NAS signalling between the UE and the MME. The MO SMS and MT SMS are signalled over SGs and do not cause any CS Fallback to GERAN/UTRAN RATs, and consequently does not require any overlapped GERAN/UTRAN coverage.

No CS Fallback is performed for SMSHUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential Page 15

CSFB: Emergency call

UE

eNB

MME

MSC

RNC

Extended Service Request with Emergency Call Indication S1-AP message with Emergency Call Indication eNB indicates in the Source RNC to Target RNC Transparent container that PS handover was triggered due to CSFB and emergency purpose

E-UTRAN may use the emergency indication for selecting a particular radio access network (2G or 3G) for CS emergency handling. If PS handover is initiated, E-UTRAN may indicate priority level of the CSFB to the target RAT