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TR 23.893 (SA2)
Feasibility study on
Multimedia Session Continuity

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V8.0.0 (Wzip)    2008/06    62 p.

Rapporteur:  Mr. Song, Jae seung
See also:  –

This study intends to investigate the general problem of IMS-level multimedia session continuity, including potential enhancements to IMS specifications that can improve the multimedia session continuity experience. In particular, the following topics will be studied:
  • Identification of session continuity scenarios;
  • PS-PS session continuity;
  • PS-PS session continuity in conjunction with PS-CS continuity;
  • Session continuity between 3GPP and non-3GPP systems;
  • Network-initiated Multimedia Session Transfer;
  • Mobility of media components of a session between different terminals under the control of the same user;
  • Coexistence and/or potential interactions with possible underlying mobility solutions defined by 3GPP. The solutions developed within this study should not have any impacts to underlying mobility solutions.
In the end this study will provide conclusions with respects to what further specification work is required in order to fulfil the IMS-level Multimedia Session Continuity requirements and improve the overall service continuity experience.


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1 Scope    2 References    3 Definitions and abbreviations    3.1 Definitions    3.2 Abbreviations    4 Architectural Requirements and Assumptions    4.1 Basic Assumptions    4.2 Architectural Requirements    4.3 Service Requirements    5 Multimedia Session Continuity Scenarios    5.1 General    5.2 PS-PS session continuity    5.3 PS-PS session continuity in conjunction with PS-CS continuity    5.4 Mobility of media components of a session between different terminals under the control of the same user    6 Architecture    6.1 General Principles and Description    6.2 MMSC Architecture Reference Model    6.3 Session Anchoring    6.4 Session Transfer    6.5 Information flows    6.6 Network-initiated Multimedia Session Transfer    7 Impacts and Enhancements to the IM CN subsystem    7.1 MMSC and CSI interworking    8 Coexistence and/or potential interactions with underlying mobility solutions    8.1 General    8.2 Impact of underlying mobility mechanisms on IMS    9 Conclusion    9.1 Conclusion on multimedia session continuity scenarios    9.2 Conclusion on MMSC architecture and anchoring solution    9.3 Conclusion on session transfer operator policy    9.4 Conclusion on the relationship between ICS and MMSC    9.5 Conclusion on specification of session split/merger functionality    9.6 Conclusion on T-ADS and session split/merger functionality for MMSC and ICS    9.7 Conclusion on the applicable scope of MMSC    9.8 Conclusion on Single Radio MMSC    9.9 Conclusion on Session Transfer Information    9.10 Conclusion on UE Transfer information flows    9.11 Conclusion on Keep and Release Control Mechanism in UE Transfer Mode    A Change history   


1   Scope   Word-p. 6
2   References
3   Definitions and abbreviations   Word-p. 7
4   Architectural Requirements and Assumptions
5   Multimedia Session Continuity Scenarios
6   Architecture   Word-p. 16
6.1   General Principles and Description
6.2   MMSC Architecture Reference Model
6.3   Session Anchoring
6.4   Session Transfer   Word-p. 19
6.5   Information flows   Word-p. 21      Up
6.5.1   MMSC Origination and Termination
6.5.2   Information flow for providing PS-PS session continuity   Word-p. 25
6.5.3   Information flows for PS-PS session continuity in conjunction with PS-CS session continuity
6.5.4   Information flow for PS-CS session continuity   Word-p. 35
6.5.5   Information flow for providing UE Transfer   Word-p. 36
6.6   Network-initiated Multimedia Session Transfer   Word-p. 51
7   Impacts and Enhancements to the IM CN subsystem   Word-p. 53
8   Coexistence and/or potential interactions with underlying mobility solutions   Word-p. 54
9   Conclusion   Word-p. 59
A   Change history   Word-p. 62      Up

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