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TECHNICAL SPECIFICATION
Digital cellular telecommunications system (Phase 2+) (GSM);
Universal Mobile Telecommunications System (UMTS);
LTE;
Circuit Switched (CS)
fallback in Evolved Packet System (EPS);
Stage 2
(3GPP TS 23.272 version 15.0.0 Release 15)
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3GPP TS 23.272 version 15.0.0 Release 15 1 ETSI TS 123 272 V15.0.0 (2018-07)
Reference
RTS/TSGS-0223272vf00
Keywords
GSM,LTE,UMTS
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DECT , PLUGTESTS , UMTS and the ETSI logo are trademarks of ETSI registered for the benefit of its Members.
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GSM and the GSM logo are trademarks registered and owned by the GSM Association.
ETSI
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3GPP TS 23.272 version 15.0.0 Release 15 2 ETSI TS 123 272 V15.0.0 (2018-07)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Trademarks
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ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
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Foreword
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or
GSM identities. These should be interpreted as being references to the corresponding ETSI deliverables.
The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under
.
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI
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3GPP TS 23.272 version 15.0.0 Release 15 3 ETSI TS 123 272 V15.0.0 (2018-07)
Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 7
1 Scope . 8
2 References . 8
3 Definitions and abbreviations . 10
3.1 Definitions . 10
3.2 Abbreviations . 10
4 Overall Description . 11
4.1 General Considerations . 11
4.2 Reference Architecture . 11
4.2.1 Reference points . 12
4.3 Functional entities . 12
4.3.1 UE . 12
4.3.2 MME . 12
4.3.3 MSC . 14
4.3.4 E-UTRAN . 14
4.3.5 SGSN . 15
4.3.6 BSS . 15
4.3.7 RNS . 15
4.4 Control plane . 16
4.4.1 MME - MSC Server . 16
4.5 Co-existence with IMS services . 16
4.6 Emergency Calls . 16
4.6.1 General . 16
4.6.2 Procedures to handle emergency call setup with IMSI . 16
4.6a Interaction with IMS Emergency session . 17
4.7 CSFB Priority Call Handling. 17
4.8 CS services handling in specific cases . 17
4.8.1 SGs paging without LAI . 17
4.8.2 Handling of SGs paging when MME cannot retrieve the S-TMSI . 18
5 Mobility Management . 18
5.1 General . 18
5.1A TAI list and LAI allocation . 18
5.2 Attach procedure . 18
5.3 Detach procedure . 21
5.3.1 UE-initiated Detach procedure . 21
5.3.1A UE-initiated Detach procedure for GERAN/UTRAN with ISR activated . 21
5.3.2 MME-initiated Detach procedure . 22
5.3.2A SGSN-initiated Detach procedure with ISR activated . 22
5.3.3 HSS-initiated Detach procedure . 23
5.3.4 Administration of the MME - MSC/VLR Association . 23
5.4 TA/LA Update procedure . 24
5.4.0 General . 24
5.4.1 Combined TA/LA Update Procedure . 24
5.4.2 Periodic TA and LA Update Procedure . 26
5.4.3 Non-EPS Alert procedure . 26
5.4.4 Void . 26
5.5 Idle Mode Signalling Reduction . 26
5.6 Mobility Management for SMS over SGs only UEs . 28
5.7 Access to CS services after selecting a non-3GPP access . 28
6 Mobile Originating Call . 28
ETSI
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3GPP TS 23.272 version 15.0.0 Release 15 4 ETSI TS 123 272 V15.0.0 (2018-07)
6.1 General . 28
6.2 Mobile Originating call in Active Mode - PS HO supported . 29
6.3 Mobile Originating call in Active Mode – No PS HO support . 31
6.4 Mobile Originating call in Idle Mode . 35
6.5 Returning back to E-UTRAN . 36
6.6 Mobile Originated or Mobile terminated call rejected by the MME . 37
7 Mobile Terminating Call . 38
7.1 General . 38
7.2 Mobile Terminating call in idle mode . 38
7.3 Mobile Terminating call in Active Mode - PS HO supported . 41
7.4 Mobile Terminating call in Active Mode - No PS HO support . 44
7.5 Roaming Retry for CS fallback . 48
7.5a Roaming Forwarding for CS fallback . 50
7.5b Coexistence of Roaming Retry and Roaming Forwarding for CS fallback . 52
7.6 Returning back to E-UTRAN . 52
7.7 Interaction with ISR . 52
7.7.1 Void . 52
7.7.2 Mobile Terminating Call when ISR is active and SGs is active between MSC/VLR and MME . 53
7.7.3 Void . 54
7.8 Mobile Terminating Call when SGs is not active . 54
8 Other CS Services . 54
8.1 General . 54
8.2 Short Message Service (SMS) . 54
8.2.1 General . 54
8.2.2 Mobile originating SMS in Idle Mode . 54
8.2.3 Mobile originating SMS in Active Mode . 56
8.2.3a Multiple Mobile originating SMSs . 56
8.2.4 Mobile terminating SMS in idle mode . 56
8.2.4a Mobile Terminated SMS in extended Idle mode DRX and in PSM . 57
8.2.4a.1 General . 57
8.2.4a.2 Procedure for Deployment Option1 and Deployment Option 2 . 58
8.2.4a.3 Procedure for Deployment Option 3 . 60
8.2.5 Mobile terminating SMS in Active Mode . 60
8.2.5a Multiple Mobile terminating SMSs . 61
8.2.5b Simultaneous Mobile terminating and Mobile originating SMSs . 61
8.2.5c Unsuccessful Mobile terminating SMS delivery attempt . 61
8.2.5d Non-SMS Mobile terminating activity during SMS delivery . 61
8.2.5e Non-SMS Mobile originating activity during SMS delivery . 61
8.2.5f Mobile Terminating SMS when ISR is active and SGs is active between MSC/VLR and MME . 62
8.2.6 Co-Existence with SMS over generic 3GPP IP access . 62
8.3 Location Services (LCS) . 62
8.3.1 MO-LR procedure . 62
8.3.1.1 General . 62
8.3.1.2 MO-LR in Active Mode with IMS VoIP session - PS HO supported . 63
8.3.1.3 MO-LR in Active Mode with IMS VoIP session - No PS HO supported . 64
8.3.2 MT-LR procedure . 64
8.3.2.1 MT-LR procedure if UE is not in IMS VoIP session . 64
8.3.2.2 MT-LR procedure while UE is in IMS VoIP session . 65
8.3.3 NI-LR procedure . 66
8.3.4 Returning back to E-UTRAN . 66
8.3.5 Co-Existence with Other Location Services . 66
8.3.5.1 Co-Existence with SUPL . 66
8.4 Other CS Services . 66
8.4.0 General . 66
8.4.1 Mobile-Initiated CS Services . 66
8.4.1.1 Mobile-Initiated CS Services if UE is not in IMS VoIP session . 66
8.4.1.2 Mobile-Initiated CS Services while UE is in IMS VoIP session. 67
8.4.2 NW-Initiated CS Services . 67
8.4.2.1 NW-Initiated CS Services if UE is not in IMS VoIP session . 67
8.4.2.2 NW-Initiated CS Services while UE is in IMS VoIP session . 68
ETSI
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3GPP TS 23.272 version 15.0.0 Release 15 5 ETSI TS 123 272 V15.0.0 (2018-07)
8.4.3 Returning back to E-UTRAN . 69
Annex A (informative): Void . 70
Annex B (normative): CS Fallback to 1xRTT . 71
B.1 Overall Description . 71
B.1.1 General Considerations . 71
B.1.2 Reference Architecture . 71
B.1.2.1 Reference points . 72
B.1.3 Functional entities . 72
B.1.3.1 UE . 72
B.1.3.2 MME . 72
B.1.3.3 E-UTRAN . 73
B.1.4 Co-existence with IMS services . 73
B.1.5 CSFB Priority Call Handling. 73
B.2 Procedures . 74
B.2.1 Mobility Management . 74
B.2.1.1 1x RTT CS Pre-Registration over EPS Procedure . 74
B.2.1.2 S102 Tunnel Redirection . 75
B.2.1.3 UE-initiated Detach Procedure . 76
B.2.2 Mobile Originating Call in Active Mode . 76
B.2.2a Mobile Originating call in Idle Mode . 78
B.2.3 Mobile Terminating Call . 78
B.2.3a Enhanced CS fallback to 1xRTT Procedure . 80
B.2.3a.1 General . 80
B.2.3a.2 Mobile Originating Call without concurrent PS handover, or with concurrent non-optimised PS
handover or optimised idle-mode PS handover. 81
B.2.3a.3 Mobile Originating Call with concurrent optimised PS handover . 84
B.2.3a.4 Mobile Terminating Call without PS handover, or with concurrent non-optimised PS handover or
optimised idle-mode PS handover . 85
B.2.3a.5 Mobile Terminating Call with concurrent optimised PS handover . 86
B.2.3a.6 Interaction between enhanced CS Fallback to 1xRTT and optimised PS handover. 87
B.2.3b Mobile Originated or Mobile terminated call rejected by the MME . 87
B.2.4 Short Message Service (SMS) . 89
B.2.4.1 General . 89
B.2.4.2 Mobile originating SMS . 89
B.2.4.3 Mobile terminating SMS . 90
B.2.5 Emergency Calls . 91
B.3 CS Fallback for UEs with dual Rx configuration . 91
B.3.1 General Considerations . 91
B.3.2 Procedures for leaving E-UTRAN . 92
B.3.3 Procedures for returning to E-UTRAN . 93
Annex C (normative): SMS in MME . 94
C.1 General . 94
C.2 Architecture . 94
C.3 Reference Points . 95
C.3.1 General . 95
C.3.2 S6a . 95
C.3.3 S6c .
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