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TS 23.272  SA2 ★
CSFB – Circuit Switched FallBack in EPS

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V14.2.0  2017/12  107 p.
V13.6.0  2017/12  107 p.
V12.6.0  2015/06  103 p.
V11.10.0  2015/06  102 p.
V10.15.0  2014/06  86 p.
V9.15.0  2013/09  76 p.
V8.12.0  2012/06  59 p.
3GPP 23.272 - EPS architecture for CS fallback and SMS over SGs
Rapporteur:  Ms. Demel, Sabine
This document defines the Stage 2 architecture and specification for the CS Fallback and for SMS over SGs for EPS or CS Fallback and SMS over S102.

full Table of Contents for  TS 23.272  Word version:   15.0.0

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1 Scope  2 References  3 Definitions and abbreviations  4 Overall Description  5 Mobility Management  6 Mobile Originating Call  7 Mobile Terminating Call  8 Other CS Services  B [N] CS Fallback to 1xRTT  C [N] SMS in MME  D Change history 

 

1  Scope  Word-p. 8
2  References
3  Definitions and abbreviations  Word-p. 10
3.1  Definitions
3.2  Abbreviations
4  Overall Description  Word-p. 11
4.1  General Considerations
4.2  Reference Architecture
4.2.1  Reference points  Word-p. 12
4.3  Functional entities
4.3.1  UE  Up
4.3.2  MME
4.3.3  MSC  Word-p. 14
4.3.4  E-UTRAN
4.3.5  SGSN  Word-p. 15
4.3.6  BSS
4.3.7  RNS [R10]
4.4  Control plane  Word-p. 16
4.4.1  MME - MSC Server
4.5  Co-existence with IMS services
4.6  Emergency Calls  Up
4.6.1  General [R9]
4.6.2  Procedures to handle emergency call setup with IMSI [R9]
4.6a  Interaction with IMS Emergency session [R9]  Word-p. 17
4.7  CSFB Priority Call Handling [R10]
4.8  CS services handling in specific cases [R10]  Word-p. 18
4.8.1  SGs paging without LAI
4.8.2  Handling of SGs paging when MME cannot retrieve the S-TMSI
5  Mobility Management
5.1  General
5.1A  TAI list and LAI allocation [R9]  Up
5.2  Attach procedure  Word-p. 19
5.3  Detach procedure  Word-p. 21
5.3.1  UE-initiated Detach procedure
5.3.1A  UE-initiated Detach procedure for GERAN/UTRAN with ISR activated  Word-p. 22
5.3.2  MME-initiated Detach procedure
5.3.2A  SGSN-initiated Detach procedure with ISR activated  Word-p. 23
5.3.3  HSS-initiated Detach procedure
5.3.4  Administration of the MME - MSC/VLR Association
5.4  TA/LA Update procedure  Word-p. 24
5.4.0  General  Up
5.4.1  Combined TA/LA Update Procedure
5.4.2  Periodic TA and LA Update Procedure  Word-p. 26
5.4.3  Non-EPS Alert procedure
5.4.4  Void
5.5  Idle Mode Signalling Reduction  Word-p. 27
5.6  Mobility Management for SMS over SGs only UEs  Word-p. 28
5.7  Access to CS services after selecting a non-3GPP access [R11]
6  Mobile Originating Call
6.1  General
6.2  Mobile Originating call in Active Mode - PS HO supported  Word-p. 29
6.3  Mobile Originating call in Active Mode - No PS HO support  Word-p. 31
6.4  Mobile Originating call in Idle Mode  Word-p. 35
6.5  Returning back to E-UTRAN  Word-p. 36
6.6  Mobile Originated or Mobile terminated call rejected by the MME [R9]  Word-p. 37
7  Mobile Terminating Call  Word-p. 38
7.1  General
7.2  Mobile Terminating call in idle mode
7.3  Mobile Terminating call in Active Mode - PS HO supported  Word-p. 41
7.4  Mobile Terminating call in Active Mode - No PS HO support  Word-p. 44
7.5  Roaming Retry for CS fallback  Word-p. 48
7.5a  Roaming Forwarding for CS fallback [R10]  Word-p. 50
7.5b  Coexistence of Roaming Retry and Roaming Forwarding for CS fallback [R10]  Word-p. 52
7.6  Returning back to E-UTRAN
7.7  Interaction with ISR
7.7.1  Void
7.7.2  Mobile Terminating Call when ISR is active and SGs is active between MSC/VLR and MME  Word-p. 53
7.7.3  Void
7.8  Mobile Terminating Call when SGs is not active  Word-p. 54
8  Other CS Services
8.1  General
8.2  Short Message Service (SMS)
8.2.1  General
8.2.2  Mobile originating SMS in Idle Mode  Up
8.2.3  Mobile originating SMS in Active Mode  Word-p. 56
8.2.3a  Multiple Mobile originating SMSs
8.2.4  Mobile terminating SMS in idle mode
8.2.4a  Mobile Terminated SMS in extended Idle mode DRX and in PSM [R13]  Word-p. 57
8.2.4a.1  General
8.2.4a.2  Procedure for Deployment Option1 and Deployment Option 2  Word-p. 58
8.2.4a.3  Procedure for Deployment Option 3  Word-p. 60
8.2.5  Mobile terminating SMS in Active Mode  Word-p. 61
8.2.5a  Multiple Mobile terminating SMSs
8.2.5b  Simultaneous Mobile terminating and Mobile originating SMSs  Up
8.2.5c  Unsuccessful Mobile terminating SMS delivery attempt
8.2.5d  Non-SMS Mobile terminating activity during SMS delivery
8.2.5e  Non-SMS Mobile originating activity during SMS delivery  Word-p. 62
8.2.5f  Mobile Terminating SMS when ISR is active and SGs is active between MSC/VLR and MME
8.2.6  Co-Existence with SMS over generic 3GPP IP access
8.3  Location Services (LCS)
8.3.1  MO-LR procedure
8.3.1.1  General [R10]
8.3.1.2  MO-LR in Active Mode with IMS VoIP session - PS HO supported [R10]  Word-p. 63
8.3.1.3  MO-LR in Active Mode with IMS VoIP session - No PS HO supported [R10]  Word-p. 64
8.3.2  MT-LR procedure
8.3.2.1  MT-LR procedure if UE is not in IMS VoIP session [R10]
8.3.2.2  MT-LR procedure while UE is in IMS VoIP session [R10]  Word-p. 65
8.3.3  NI-LR procedure  Word-p. 66
8.3.4  Returning back to E-UTRAN
8.3.5  Co-Existence with Other Location Services
8.3.5.1  Co-Existence with SUPL
8.4  Other CS Services
8.4.0  General [R9]
8.4.1  Mobile-Initiated CS Services  Up
8.4.1.1  Mobile-Initiated CS Services if UE is not in IMS VoIP session [R11]
8.4.1.2  Mobile-Initiated CS Services while UE is in IMS VoIP session [R11]  Word-p. 67
8.4.2  NW-Initiated CS Services
8.4.2.1  NW-Initiated CS Services if UE is not in IMS VoIP session [R11]
8.4.2.2  NW-Initiated CS Services while UE is in IMS VoIP session [R11]  Word-p. 68
8.4.3  Returning back to E-UTRAN  Word-p. 69
A  Void
B (Normative)  CS Fallback to 1xRTT  Word-p. 71
B.1  Overall Description
B.1.1  General Considerations
B.1.2  Reference Architecture  Up
B.1.2.1  Reference points  Word-p. 72
B.1.3  Functional entities
B.1.3.1  UE
B.1.3.2  MME
B.1.3.3  E-UTRAN  Word-p. 73
B.1.4  Co-existence with IMS services
B.1.5  CSFB Priority Call Handling [R10]
B.2  Procedures  Word-p. 74
B.2.1  Mobility Management
B.2.1.1  1x RTT CS Pre-Registration over EPS Procedure  Up
B.2.1.2  S102 Tunnel Redirection  Word-p. 75
B.2.1.3  UE-initiated Detach Procedure [R9]  Word-p. 76
B.2.2  Mobile Originating Call in Active Mode
B.2.2a  Mobile Originating call in Idle Mode  Word-p. 78
B.2.3  Mobile Terminating Call
B.2.3a  Enhanced CS fallback to 1xRTT Procedure [R9]  Word-p. 80
B.2.3a.1  General
B.2.3a.2  Mobile Originating Call without concurrent PS handover, or with concurrent non-optimised PS handover or optimised idle-mode PS handover  Word-p. 81
B.2.3a.3  Mobile Originating Call with concurrent optimised PS handover  Word-p. 84
B.2.3a.4  Mobile Terminating Call without PS handover, or with concurrent non-optimised PS handover or optimised idle-mode PS handover  Word-p. 85
B.2.3a.5  Mobile Terminating Call with concurrent optimised PS handover  Word-p. 86
B.2.3a.6  Interaction between enhanced CS Fallback to 1xRTT and optimised PS handover  Word-p. 87
B.2.3b  Mobile Originated or Mobile terminated call rejected by the MME [R9]
B.2.4  Short Message Service (SMS)  Word-p. 89
B.2.4.1  General
B.2.4.2  Mobile originating SMS
B.2.4.3  Mobile terminating SMS  Word-p. 90
B.2.5  Emergency Calls  Word-p. 91
B.3  CS Fallback for UEs with dual Rx configuration [R9]
B.3.1  General Considerations  Up
B.3.2  Procedures for leaving E-UTRAN  Word-p. 92
B.3.3  Procedures for returning to E-UTRAN  Word-p. 93
C (Normative)  SMS in MME [R11]
C.1  General
C.2  Architecture
C.3  Reference Points  Word-p. 94
C.3.1  General
C.3.2  S6a
C.3.3  S6c
C.3.4  SGd  Word-p. 95
C.4  Network Entities
C.4.1  General
C.4.2  MME
C.4.3  HSS
C.5  Roaming considerations  Word-p. 96
C.6  Unsuccessful Mobile-Terminated SMS Transfer
C.7  Information storage  Word-p. 97
C.7.1  HSS
C.7.2  MME
C.8  Registration of MME for SMS  Word-p. 98
C.8.1  Request for registration
C.8.2  Removal of registration of MME for SMS  Word-p. 99
C.8.2.0  General
C.8.2.1  HSS-initiated removal of registration of MME for SMS  Word-p. 100
C.8.2.2  MME-initiated removal of registration of MME for SMS
D  Change history  Word-p. 101

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