TR 24.879
Combining Circuit-Switched (CS) calls and
IP Multimedia Subsystem (IMS) sessions
V7.0.0 (Wzip)
2006/03 73 p.
- Rapporteur:
- Mr. Dawes, Peter
VODAFONE Group Plc
full Table of Contents for TR 24.879 Word version: 7.0.0
1 Scope p. 7
The present document provides the technical realisation for the combination of Circuit Switched calls and IM sessions when using them simultaneously between the same two users.
The present document describes the use of CS and IM services in combination, using the existing procedures that have been defined for CS and IMS. It includes the necessary function as adding an IM session to an ongoing CS call, adding a CS call to an ongoing IM session, supplementary services as they relate to CSICS and supporting capability exchange.
The present document is applicable to UE and Application Servers providing for the combination of Circuit Switched calls and IM sessions.
2 References p. 7
3 Definitions, symbols and abbreviations p. 8
3.1 Definitions p. 8
3.2 Abbreviations p. 8
4 Common capability information and identifiers for CS-first and IMS-first scenarios p. 8
4.1 UE capability exchange - overview p. 8
4.2 Personal ME identifier p. 8
4.3 UE capability version p. 9
4.4 Radio environment information p. 9
5 Common procedures for CS-first and IMS-first scenarios p. 9
5.1 Registration of UE capabilities p. 9
5.2 Criteria for initiating capability exchange p. 9
5.3 Criteria for responding to a capability exchange request p. 10
5.4 Exchange of radio environment information p. 10
5.5 Storage of capabilities in the UE p. 10
6 Combining a CS call with an existing IM session p. 10
6.1 Introduction p. 10
6.2 Functional entities p. 10
6.2.1 User equipment p. 10
6.2.2 Application server (AS) p. 11
6.3 Roles p. 11
6.3.1 CSI user agent (CUA) p. 11
6.3.1.1 General p. 11
6.3.1.2 Exchange of UE capability information - IM session first scenario p. 11
6.3.1.3 Session set-up - originating case p. 11
6.3.1.4 Session set-up - terminating case p. 12
6.3.1.5 CS call set-up - originating case p. 12
6.3.1.6 CS call set-up - terminating case p. 13
6.3.1.7 SDP exchange - UE capability information exchange p. 13
6.3.1.8 SDP offer answer - originating case p. 13
6.3.1.9 SDP offer answer - terminating case p. 13
7 Combining an IM session with an existing CS call p. 14
7.1 Introduction p. 14
7.2 Functional entities p. 14
7.2.1 User equipment p. 14
7.2.2 Application server (AS) p. 14
7.3 Roles p. 14
7.3.1 CSI user agent (CUA) p. 14
7.3.1.1 General p. 14
7.3.1.2 Exchange of UE capability information - CS first scenario p. 14
7.3.1.3 Session set-up - originating case p. 15
7.3.1.4 Session set-up - terminating case p. 15
7.3.1.5 CS call set-up - originating case p. 15
7.3.1.6 CS call set-up - terminating case p. 16
7.3.1.7 SDP exchange - UE capability information exchange p. 16
7.3.1.8 SDP offer-answer - originating case p. 16
7.3.1.9 SDP offer-answer - terminating case p. 16
8 Interaction with supplementary services p. 17
A (Normative) Media feature tags defined within the current document p. 17
A.1 General p. 17
A.2 Definition of "+g.3gpp.cs-voice" p. 17
A.3 Definition of "+g.3gpp.cs-video" p. 17
B Example signalling flows for the combining of CS calls with IM sessions p. 18
B.1 Scope of signalling flows p. 18
B.2 Introduction p. 18
B.3 Signalling flows demonstrating CSI session setup when no CS call has yet been set up p. 19
B.4 Signalling flows demonstrating CSI session setup when a CS call is already established p. 28
B.5 Signalling flows demonstrating capability information exchange in a CS call (only) p. 38
B.6 Signalling flows demonstrating UE capability exchange outside a CS call p. 41
B.6.1 Introduction p. 41
B.6.2 UE capability exchange p. 41
B.6.3 UE capability exchange with UE capability version p. 49
B.7 Signalling flows demonstrating UE capability exchange when a CS call is already in progress p. 51
C Proposed changes to 3GPP TS 24.008 [4] p. 55
X (Normative) 3GPP capability exchange protocol p. 61
X.1 Scope p. 61
X.2 User-user protocol contents p. 62
X.3 Information element identifier p. 62
X.4 Information elements p. 63
X.4.1 Personal ME identifier p. 63
X.4.2 Radio environment capability p. 64
X.4.3 UE capability version p. 64
X.5 Handling of unknown, unforeseen, and erroneous protocol data p. 65
X.5.1 General p. 65
X.5.2 Not supported IEs, unknown IEIs p. 66
X.5.3 Repeated IEs p. 66
X.5.4 Syntactically incorrect IEs p. 66
X.5.5 Semantically incorrect IEs p. 66
D Proposed changes to 3GPP TS 24.229 [5] p. 66
$ Change history p. 72
