ETSI TS 123 237 V11.11.0 (2016-03)

Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) Service Continuity; Stage 2 (3GPP TS 23.237 version 11.11.0 Release 11)

RTS/TSGS-0223237vbb0

General Information

• Status: Published
• Publication Date: 08-Mar-2016
• Technical Committee: 3GPP SA 2 - Architecture
• Current Stage: 12 - Completion
• Completion Date: 09-Mar-2016

Standards Content (Sample)

ETSI TS 12123 237 V11.11.0 (201016-03)

TECHNICAL SPECIFICATIONION
Digital cellular telecocommunications system (Phahase 2+);
Universal Mobile Telelecommunications System ( (UMTS);
LTE;
IP Multimedia Suubbsystem (IMS) Service Conttinuity;in
Stage 2
(3GPP TS 23.2.2337 version 11.11.0 Release 1 11)

3GPP TS 23.237 version 11.11.0 Release 11 1 ETSI TS 123 237 V11.11.0 (2016-03)

Reference
RTS/TSGS-0223237vbb0
Keywords
GSM,LTE,UMTS
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© European Telecommunications Standards Institute 2016.
All rights reserved.
TM TM TM
DECT , PLUGTESTS , UMTS and the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members.
TM
3GPP and LTE™ are Trade Marks of ETSI registered for the benefit of its Members and
of the 3GPP Organizational Partners.
GSM® and the GSM logo are Trade Marks registered and owned by the GSM Association.
ETSI
3GPP TS 23.237 version 11.11.0 Release 11 2 ETSI TS 123 237 V11.11.0 (2016-03)
Intellectual Property Rights
IPRs essential or potentially essential to the present document 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.
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
http://webapp.etsi.org/key/queryform.asp.
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.
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Contents
Intellectual Property Rights . 2
Foreword . 2
Modal verbs terminology . 2
Foreword . 9
Introduction . 9
1 Scope . 10
2 References . 10
3 Definitions, symbols and abbreviations . 12
3.1 Definitions . 12
3.2 Abbreviations . 13
4 High level principles and architectural requirements . 14
4.1 Basic Assumptions . 14
4.1.0 General . 14
4.1.1 PS-CS Access Transfer . 14
4.1.2 PS-PS Access Transfer . 15
4.1.3 Inter-UE Transfer . 15
4.2 Architectural Requirements . 15
4.2.1 General Requirements . 15
4.2.2 Access Transfer Requirements . 16
4.2.3 IUT Requirements . 16
4.3 Service Continuity . 18
4.3.1 Session Transfer concepts . 18
4.3.1.1 General . 18
4.3.1.2 Access Transfer concepts . 18
4.3.1.2.1 General Access Transfer concepts . 18
4.3.1.2.2 Access Transfer (PS – CS) concepts . 18
4.3.1.2.2A MSC Server assisted mid-call feature . 19
4.3.1.2.3 Co-existence of ICS UE and MSC Server assisted mid-call feature . 19
4.3.1.3 Inter-UE Transfer concepts . 20
4.3.1.3.1 General . 20
4.3.1.3.2 Controller UE and Controllee UE operations . 21
4.3.1.3.2.1 Overview . 21
4.3.2 Void . 21
4.3.3 Information used for IMS Service Continuity . 21
5 Architecture model and reference points . 22
5.1 Overview . 22
5.2 Reference Architecture for non emergency session . 22
5.2.1 General . 22
5.2.2 Architecture when using ATCF enhancements. 22
5.3 Functional Entities . 23
5.3.1 SCC AS . 23
5.3.2 IMS Service Continuity UE . 25
5.3.2.1 Access Transfer Functions . 25
5.3.2.2 IUT Functions and Roles . 25
5.3.2.2.1 Functions . 25
5.3.2.2.2 Controller UE Role . 25
5.3.2.2.3 Controllee UE Role . 26
5.3.3 Emergency Access Transfer Function (EATF) . 26
5.3.4 Access Transfer Control Function (ATCF) . 26
5.3.4.1 General . 26
5.3.4.2 ATCF inclusion . 27
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5.3.5 Access Transfer Gateway (ATGW) . 28
5.3.6 HSS . 28
5.3.7 MSC Server . 28
5.4 Signalling and bearer paths for IMS Service Continuity . 28
5.4.1 General . 28
5.4.2 Sessions with PS media flow(s) . 28
5.4.2a Sessions with PS media flow(s) using ATCF . 29
5.4.3 Sessions with CS media . 29
5.4.3a Sessions with CS media flow(s) using ATCF . 29
5.5 IUT Collaborative Sessions . 30
5.6 Reference Architecture for SRVCC emergency session . 31
6 Procedures and flows for Access Transfer . 31
6.0 Introduction . 31
6.1 Registration . 31
6.1.1 General . 31
6.1.2 Registration using ATCF enhancements. 31
6.1.3 Registration: CS to PS - Single Radio . 33
6.1.3.1 IMS Registration by UE . 33
6.1.3.2 UE IMS Registration change update . 33
6.2 Origination and Termination . 34
6.2.1 Origination . 34
6.2.1.1 Origination Procedures . 34
6.2.1.2 Originating sessions that use CS media . 34
6.2.1.3 Originating sessions that use only PS media flow(s) . 35
6.2.1.4 Originating sessions for (v)SRVCC that use ATCF enhancements . 36
6.2.1.5 Originating sessions for CS to PS - Single Radio . 36
6.2.2 Termination. 37
6.2.2.1 Termination Procedures . 37
6.2.2.2 Terminating sessions that use CS media . 37
6.2.2.3 Terminating sessions that use only PS media flow(s) . 38
6.2.2.4 Terminating sessions over Gm where speech media is not accepted by the UE . 39
6.2.2.5 Terminating sessions for (v)SRVCC that use ATCF enhancements . 39
6.2.2.6 Terminating sessions for CS to PS - Single Radio . 40
6.3 Access Transfer . 41
6.3.1 Access Transfer Procedure . 41
6.3.1.1 Introduction . 41
6.3.1.2 Access Transfer Procedures . 41
6.3.1.2a Access Transfer Procedures using ATCF enhancements . 42
6.3.1.3 Enablement of Access Transfer procedures . 42
6.3.1.3a Enablement of Access Transfer procedures using ATCF enhancements . 43
6.3.1.4 Execution of Access Transfer procedures . 43
6.3.1.4a Execution of Access Transfer procedures using ATCF enhancements . 43
6.3.1.5 Remote Leg Update. 43
6.3.1.6 Source Access Leg Release . 44
6.3.1.7 Access Transfer Information for ATCF . 44
6.3.2 Access Transfer Information flows . 45
6.3.2.0 General . 45
6.3.2.1 PS – CS Access Transfer . 45
6.3.2.1.1 PS – CS Access Transfer: PS to CS - Dual Radio . 45
6.3.2.1.1a PS – CS Access Transfer: PS to CS – Dual Radio with Session State Information . 46
6.3.2.1.2 PS – CS Access Transfer: CS to PS - Dual Radio . 47
6.3.2.1.2a PS – CS Access Transfer: CS to PS – Dual Radio with Session State Information . 48
6.3.2.1.3 Subsequent Access Transfers . 49
6.3.2.1.4 PS – CS Access Transfer: PS to CS – Single Radio . 49
6.3.2.1.4a PS – CS Access Transfer: PS to CS – Single Radio with Session State Information . 51
6.3.2.1.4b PS to CS Access Transfer: PS to CS – Single Radio; using I1 reference point . 53
6.3.2.1.4c PS - CS Access Transfer: PS to CS - Single Radio, incoming voice or video call in alerting
phase . 54
6.3.2.1.4d PS - CS Access Transfer: PS to CS - Single Radio, outgoing voice or video call in alerting
phase . 56
6.3.2.1.4e PS - CS Access Transfer: PS to CS - Single Radio, voice and video . 58
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6.3.2.1.5 PS – CS Access Transfer for voice and video, Dual Radio . 60
6.3.2.1.6 PS – CS Access Transfer: PS to CS – Dual Radio, mid-call service with an active speech and
video session . 61
6.3.2.1.7 PS – CS Access Transfer: PS to CS – Dual Radio, mid-call service with one inactive speech
and video session . 61
6.3.2.1.7a PS - CS Access Transfer: PS to CS - Single Radio, mid-call service with an incoming waiting
call in alerting phase . 62
6.3.2.1.7b PS - CS Access Transfer: PS to CS - Single Radio, mid-call service with an outgoing call in
alerting phase . 64
6.3.2.1.7c PS - CS Access Transfer: PS to CS - Single Radio, mid-call service with an incoming call in
alerting phase and a held session . 66
6.3.2.1.8 PS - CS Access Transfer: Conferencing - for UEs not using ICS capabilities . 68
6.3.2.1.9 PS – CS Access Transfer: PS to CS – Single Radio using ATCF enhancements . 69
6.3.2.1.10 PS - CS Access Transfer: CS to PS - Single Radio . 72
6.3.2.2 PS - PS Access Transfer . 75
6.3.2.2.1 PS-PS Access Transfer with full media transfer . 75
6.3.2.2.2 PS-PS Access Transfer with partial media transfer . 76
6.3.2.2.3 PS-PS Access Transfer with full media transfer for an incoming call in early dialog phase . 76
6.3.2.2.4 PS-PS Access Transfer with full media transfer for an outgoing call in early dialog phase . 78
6.3.2.3 PS - PS in conjunction with PS - CS Access Transfer . 79
6.3.2.3.1 PS - PS in conjunction with PS - CS Access Transfer: PS to CS for UEs not using ICS
capabilities . 79
6.3.2.3.2 PS - PS in conjunction with PS - CS Access Transfer: CS to PS for UEs not using ICS
capabilities . 81
6.3.2.3.3 PS – PS in conjunction with PS - CS Access Transfer: PS to CS for UEs with ICS capabilities
- Using Gm reference point . 81
6.3.2.3.4 PS - PS in conjunction with PS - CS Access Transfer: CS to PS for UEs with ICS capabilities
- Using Gm reference point . 83
6.3.2.3.5 PS – PS in conjunction with PS – CS Access Transfer: Active/Held sessions - Using Gm
reference point . 83
6.3.2.3.6 PS – PS in conjunction with PS – CS Access Transfer: Explicit Communication Transfer -
Using Gm reference point. 84
6.3.2.3.7 PS – PS in conjunction with PS – CS Access Transfer: Conferencing - Using Gm reference
point . 84
6.3.2.3.8 PS – PS in conjunction with PS – CS Access Transfer: PS to CS – using I1 reference point . 84
6.3.2.3.9 PS - PS in conjunction with PS - CS Access Transfer: CS to PS - using I1 reference point . 86
6.3.2.3.10 PS - PS in conjunction with PS - CS Access Transfer: PS to CS for Active/Held sessions -
using I1 reference point . 86
6.3.2.3.11 PS - PS in conjunction with PS - CS Access Transfer: CS to PS for Active/Held sessions -
using I1 reference point . 87
6.3.3 Media Adding/Deleting . 87
6.3.3.1 Local End Initiation case: Adding new PS media to existing CS session . 87
6.3.3.2 Local End Initiation case: Incorporating existing CS media in new IMS Session and Gm Service
Control . 88
6.3.3.3 Local End Initiation case: Adding PS media to IMS session with CS media . 89
6.3.3.4 Remote End Initiation case: Adding new PS media to existing CS session . 90
6.3.3.5 Remote End Initiation case: Incorporating existing CS media in new IMS Session and Gm
Service Control . 91
6.3.3.6 Remote End Initiation case: Adding PS media to IMS session with CS media . 92
6.3.3.7 Local End Initiation case – Removing media from split CS and PS sessions . 93
6.3.3.8 Remote End Initiation case – Removing media from split CS and PS sessions . 94
6.3.3.9 Local End Initiation case: Adding new PS media to existing PS session. 95
6.3.3.10 Remote End Initiation case: Adding new PS media to existing PS session . 95
6.3.3.11 Local End Initiation case: Removing media from split PS sessions . 95
6.3.3.12 Remote End Initiation case: Removing media from split PS sessions . 95
6.3.4 Void . 95
6.3.5 Service continuity for ICS UE using MSC Server assisted mid-call feature while maintaining CS
media . 95
6.4 Operator Policy and User Preferences . 95
6.5 Execution of supplementary services . 96
6.5.1 General . 96
6.5.2 Originating Identification Presentation (OIP) . 96
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6.5.3 Originating Identification Restriction (OIR) . 97
6.5.4 Terminating Identification Presentation (TIP) . 97
6.5.5 Terminating Identification Restriction (TIR) . 97
6.5.6 Communication Diversion (CDIV) . 97
6.5.7 Communication Hold (HOLD) . 97
6.5.8 Communication Barring (CB). 97
6.5.9 Message Waiting Indication (MWI) . 97
6.5.10 Conference (CONF) . 97
6.5.11 Explicit Communication Transfer (ECT) . 98
6.5.12 Advice of Charge (AOC) . 98
6.5.13 Closed User Groups (CUG) . 98
6.5.14 Three-Party (3PTY) . 98
6.5.15 Flexible Alerting (FA) . 98
6.5.16 Communication Waiting (CW) . 98
6.5.17 Completion of Communications to Busy Subscriber (CCBS)/Completion of Communications by No
Reply (CCNR) . 98
6.5.18 Customized Alerting Tones (CAT) . 98
6.5.19 Malicious Communication IDentification (MCID) . 98
6.5.20 Reverse Charging . 98
6.5.21 Personal Network Management (PNM) . 99
6.5.22 Customized Ringing Signal (CRS) . 99
6a Procedures and flows for Inter-UE Transfer . 99
6a.0 Introduction . 99
6a.0.1 Void . 99
6a.1 IUT general procedures . 99
6a.1.1 General . 99
6a.1.2 Remote Leg Update . 99
6a.2 Information flows for Collaborative Session establishment . 99
6a.2.1 Establish Collaborative Session by transferring media . 99
6a.2.2 Establish Collaborative Session with new media. 100
6a.2.3 Establish Collaborative Session at originating IMS session setup . 101
6a.2.4 Establish Collaborative Session at terminating IMS session setup . 103
6a.3 Media Transfer within Collaborative Session . 104
6a.3.1 Controller UE initiated media transfer from Controller UE to Controllee UE . 104
6a.3.1.1 Controller UE and Controllee UE belong to the same subscription . 104
6a.3.1.2 Controller UE and Controllee UE belong to different subscriptions . 105
6a.3.2 Controller UE initiated media transfer from Controllee UE to Controller UE . 106
6a.3.3 Controller UE initiated media transfer from Controllee UE to another Controllee UE . 107
6a.3.3.1 Controller UE and Controllee UEs belong to the same subscription . 107
6a.3.3.2 Controller UE and Controllee UEs belong to different subscriptions . 108
6a.3.3a Controllee UE Initiated Transfer Media from one Controllee UE to another Controllee UE . 110
6a.3.4 Void . 111
6a.3.4.1 Void. 111
6a.3.4.2 Void. 111
6a.4 Media adding/deleting/modifying within Collaborative Session . 112
6a.4.1 Controller UE initiated add new media on Controller UE . 112
6a.4.2 Controller UE initiated add new media on Controllee UE . 112
6a.4.2.1 Controller UE and Controllee UE belong to the same subscription . 112
6a.4.2.2 Controller UE and Controllee UE belong to different subscriptions . 113
6a.4.3 Controller UE Initiated Release Media (media flow on the Controller UE) . 115
6a.4.4 Controller UE Initiated Release Media (media flow on the Controllee UE) . 116
6a.4.4.1 Controller UE and Controllee UE belong to the same subscription . 116
6a.4.4.2 Controller UE and Controllee UE belong to different subscriptions . 117
6a.4.4a Controller UE initiated modify media (media flow on the Controllee UE) . 118
6a.4.4a.1 Controller UE and Controllee UE belong to the same IMS subscription . 118
6a.4.4a.2 Controller UE and Controllee UE belong to different IMS subscriptions under the same operator . 119
6a.4.5 Controllee UE initiated release media on itself. 120
6a.4.6 Controllee UE initiated modify media on itself . 121
6a.4.6.0 General . 121
6a.4.6.1 Controller UE and Controllee UE belong to the same IMS subscription . 121
6a.4.6.2 Controller UE and Controllee UE belong different IMS subscriptions under the same operator . 122
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6a.4.6a Controllee UE initiated add new media on another Controllee UE . 123
6a.4.7 Remote party initiated add new media . 124
6a.4.8 Remote party initiated release media . 126
6a.4.9 Remote party initiated media modification . 127
6a.4a Transfer of Collaborative Session Control . 127
6a.4a.1 Controller UE transfers Collaborative Session Control to a Controllee UE without Media Transfer. 127
6a.4a.2 Controller UE transfers Collaborative Session Control to another UE with Media Transfer . 129
6a.4a.3 Transfer of Collaborative Session Control upon loss of Controller UE . 130
6a.4a.4 Transfer of Collaborative Session Control with media flows upon loss of Controller UE . 131
6a.4a.5 Transfer of Collaborative Session Control initiated by the target UE . 133
6a.5 Collaborative Session release . 134
6a.5.1 Controller UE Initiated Release Collaborative Session . 134
6a.5.2 Remote Party Initiated Release Collaborative Session . 135
6a.6 Inter-UE Transfer without establishing a Collaborative Session . 135
6a.6.1 Inter-UE Transfer initiated by the source UE . 135
6a.6.2 Inter-UE Transfer initiated by the target UE. 137
6a.7 Execution of supplementary services . 138
6a.7.1 General . 138
6a.7.2 Originating Identification Presentation (OIP) . 138
6a.7.3 Originating Identification Restriction (OIR) . 138
6a.7.4 Terminating Identification Presentation (TIP) . 138
6a.7.5 Terminating Identification Restriction (TIR) . 138
6a.7.6 Communication Diversion (CDIV) . 138
6a.7.7 Communication Hold (HOLD) . 138
6a.7.7.1 Controller UE invoking the HOLD service on the media flow on a Controllee UE . 139
6a.7.8 Communication Barring (CB). 139
6a.7.9 Message Waiting Indication (MWI) . 139
6a.7.10 Conference (CONF) . 140
6a.7.11 Explicit Communication Transfer (ECT) . 140
6a.7.12 Advice of Charge (AOC) . 140
6a.7.13 Closed User Groups (CUG) . 140
6a.7.14 Three-Party (3PTY) . 140
6a.7.15 Flexible Alerting (FA) . 140
6a.7.16 Communication Waiting (CW) . 140
6a.7.17 Completion of Communications to Busy Subscriber (CCBS)/Completion of Communications by No
Reply (CCNR) . 141
6a.7.18 Customized Alerting Tones (CAT) . 141
6a.7.19 Malicious Communication IDentification (MCID) . 141
6a.7.20 Reverse Charging . 141
6a.7.21 Personal Network Management (PNM) . 141
6a.7.22 Customized Ringing Signal (CRS) .
...