Content for TR 23.893 Word version: 8.0.0
0 Introduction p. 5
Multimedia service continuity requirements for Rel 8 have already been included in both TS 22.278 (Service requirements for evolution of the 3GPP system) and TS 22.258 [2] (Service requirements for the AIPN). This document introduces the corresponding stage-2 requirements and studies IMS-level architectures and solutions that can enable multimedia service continuity.
1 Scope p. 6
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.
2 References p. 6
The following documents contain provisions which, through reference in this text, constitute provisions of the present document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or non specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same Release as the present document.
[1]
TR 21.905: "Vocabulary for 3GPP Specifications".
[2]
TS 22.258: "Service requirements for the AIPN".
→ to date, withdrawn by 3GPP
[3]
→ to date, withdrawn by 3GPP
TS 22.278: "Service requirements for evolution of the 3GPP system".
[4]
TS 23.401: "GPRS enhancements for E-UTRAN access".
[5]
TS 23.402: "Architecture enhancements for non-3GPP accesses".
[6]
TS 23.206: "Voice Call Continuity between CS and IMS".
[7]
TS 23.228: "IP Multimedia Subsystem (IMS)".
[8]
TS 23.002: "Network architecture".
[9]
TS 23.279: "Combining Circuit Switched (CS) and IP Multimedia Subsystem (IMS) services".
[10]
TS 23.292: "IP Multimedia System (IMS) centralized services".
[11]
TS 23.203: "Policy and charging control architecture".
[12]
TS 29.214: "Policy and charging over Rx reference point".
[13]
TS 24.216: "Communication Continuity Management Object (MO)".
[14]
TR 23.892: "IP Multimedia System (IMS) centralized services".
3 Definitions and abbreviations p. 7
3.1 Definitions p. 7
For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply.
Multimedia Session Transfer:
Transfer at the IMS-level of one or more of the session signalling paths and associated media paths of an ongoing multimedia session while maintaining session continuity. The multimedia session transfer incorporates both Access Network Transfer and UE Transfer.
Multi-Media Session Continuity:
A service of the IMS which supports the use of Multimedia Session Transfer mechanisms in order to handle Terminal Mobility events and/or mobility between UEs for the case when such events are not hidden from the IMS session layer and thus Session Continuity could not otherwise be maintained.
MMSC UE:
The MMSC UE is a User Equipment supporting multimedia session continuity as defined in this document.
Domain Transfer:
as defined in TS 23.206 [6].
Access Network Transfer:
Transfer at the IMS-level of both the signalling path and media path of an ongoing multimedia session on a UE from PS to CS domain or vice versa or between different IP CANs.
UE Transfer:
Transfer at the IMS-level of all or some of the media components and associated signalling between UEs under the control of the user.
Network-initiated Multimedia Session Transfer:
A Multimedia Session Transfer that is initiated by the network.
3.2 Abbreviations p. 7
For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply:
EPS
Evolved Packet System
ICS
IMS Centralized Services
MMSC
Multi-Media Session Continuity
