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TS 23.237SA2
IMS Service Continuity

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V16.3.0 (Wzip)  2019/09  189 p.
V15.2.0 (PDF)  2019/09  185 p.
V14.2.0  2016/12  183 p.
V13.1.0  2015/12  172 p.
V12.10.0  2015/12  172 p.
V11.11.0  2015/12  171 p.
V10.13.0  2015/12  158 p.
V9.10.0  2012/12  86 p.
V8.7.0  2010/03  42 p.

Rapporteur:  Mr. Song, Jae seungLG Electronics Inc.

IMS based services can be provided with use of PS bearers and CS bearers for the media. When using CS bearer for media transport of IMS sessions, interworking solutions for IMS Centralized Services (ICS) as specified in TS 23.292 are used. ICS allows IMS sessions using CS bearers to be treated as standard IMS sessions for the purpose of IMS Service Continuity (ISC). ICS defines signalling mechanisms between the UE and IMS for transport of information as needed for service continuity when using CS access for media transport. Both ICS and ISC specify functions which are provided by a SIP application server.
3GPP 23.237 - IMS Service Centralization and Continuity Reference Architecture when using ATCF
This TS specifies the architectural requirements and procedures for delivery of IMS Service Continuity (ISC). The solution is restricted to service continuity using IMS procedures, i.e. mobility mechanisms on the IP-CAN level are not within the scope of this specification.

short Table of Contents for  TS 23.237  Word version:   16.3.0

each title links to the equivalent title in the full ToC
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1  ScopeWord-p. 11
2  ReferencesWord-p. 11
3  Definitions, symbols and abbreviationsWord-p. 13
4  High level principles and architectural requirementsWord-p. 15
5  Architecture model and reference pointsWord-p. 23
6  Procedures and flows for Access TransferWord-p. 33
6.0  IntroductionWord-p. 33
6.1  RegistrationWord-p. 33
6.2  Origination and TerminationWord-p. 36
6.3  Access TransferWord-p. 45
6.4  Operator Policy and User PreferencesUpWord-p. 102
6.5  Execution of supplementary servicesWord-p. 103
6a  Procedures and flows for Inter-UE Transfer [R9]Word-p. 106
6a.0  IntroductionWord-p. 106
6a.1  IUT general proceduresWord-p. 106
6a.2  Information flows for Collaborative Session establishmentWord-p. 106
6a.3  Media Transfer within Collaborative SessionWord-p. 111
6a.4  Media adding/deleting/modifying within Collaborative SessionWord-p. 119
6a.4a  Transfer of Collaborative Session Control [R10]Word-p. 134
6a.5  Collaborative Session releaseWord-p. 141
6a.6  Inter-UE Transfer without establishing a Collaborative SessionWord-p. 142
6a.7  Execution of supplementary servicesWord-p. 145
6a.8  IUT target discoveryUpWord-p. 148
6a.9  Inter-UE Transfer Initiated by Target UE [R10]Word-p. 151
6a.10  Media Flow Replication by network [R10]Word-p. 158
6a.11  Session Replication by remote party [R10]Word-p. 164
6a.12  User authorisation and preferences [R10]Word-p. 168
6c  Procedures and flows for SRVCC Emergency Session [R9]Word-p. 169
6d  Procedures and flows for DRVCC Emergency Session for WLAN [R14]Word-p. 176
7  SecurityWord-p. 178
8  ChargingWord-p. 178
A  Controller UE and Controllee UE operations [R9]Word-p. 180
B (Normative)  Additional enhancements for SRVCC [R14]Word-p. 182
C (Normative)  ATCF in Architectures without IMS-level roaming interfaces [R16]Word-p. 185
D  Change historyWord-p. 188

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