Content for TS 23.279 Word version: 17.0.0
0 Introduction
1 Scope
2 References
3 Definitions and abbreviations
3.1 Definitions
3.2 Abbreviations
...
...
0 Introduction p. 6
The combination of CS and IMS services (CSI) is the parallel operation of a CS service and an IMS session between the same two users. It does not require a specific subscription and a specific charging correlation.
1 Scope p. 7
The present document provides architectural details to combine CS services and IMS services for using them in parallel between the same two users in a peer-to-peer context. The document provides a detailed description of how capabilities and identities are exchanged to enable the combination of CS and IMS services between the same two UEs.
The present document includes the following capabilities that enable the combination of CS and IMS services:
- Radio capability exchange.
- SIP based UE terminal capability exchange.
- MSISDN number exchange in SIP.
- Establishing an IMS session in parallel to an ongoing CS call between the same two UEs.
- Establishing a CS call in parallel to an ongoing IMS session between the same two users UEs.
- Network support for establishing multimedia sessions between a UE that uses IMS origination and a UE that uses CSI termination.
2 References p. 7
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 23.228: "IP Multimedia Subsystem (IMS); Stage 2".
[3]
TS 23.081: "Line Identification supplementary services; Stage 2".
[4]
TS 23.221: "Architectural Requirements".
[5]
TS 23.002: "Network Architecture".
[6]
TS 24.008: "Mobile radio interface Layer 3 specification; Core network protocols; Stage 3".
[7]
TS 29.002: "Mobile Application Part (MAP) specification".
[8]
TS 23.082: "Call Forwarding (CF) supplementary services; Stage 2".
[9]
TS 23.083: "Call Waiting (CW) and Call Hold (HOLD) supplementary services; Stage 2".
[10]
TS 23.060: "General Packet Radio Service (GPRS); Service description; Stage 2".
[11]
TS 23.088: "Call Barring (CB) Supplementary Service; Stage 2".
[12]
TS 23.091: "Explicit Call Transfer (ECT) Supplementary Service; Stage 2".
[13]
TS 22.279: "Combined CS Calls and IMS Sessions; Stage 1".
[14]
TS 22.115: "Service Aspects; Charging and Billing".
[15]
TS 23.087: "User-to-User Signalling (UUS) Supplementary Service; Stage 2".
[16]
TS 23.078: "Customised Applications for Mobile network Enhanced Logic (CAMEL) Phase 4; Stage 2".
[17]
TS 23.206: "Voice Call Continuity (VCC) between Circuit Switched (CS) and IP Multimedia Subsystem (IMS); Stage 2".
[18]
RFC 3840: "Indicating User Agent Capabilities in the Session Initiation Protocol (SIP)".
[19]
RFC 3841: "Caller Preferences for the Session Initiation Protocol (SIP)".
[20]
TS 22.087: "User-to-User Signalling (UUS); Service description; Stage 1".
3 Definitions and abbreviations p. 8
3.1 Definitions p. 8
For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
CSI session:
a multimedia session that uses the CS domain to transport all or some media components (typically, voice) and the IMS/PS domain to transport the other media components. A CSI session can be created either by establishing first a CS call and subsequently a concurrent IMS session(s), or by establishing first an IMS session(s) and subsequently a concurrent CS call. From the user point of view, a CSI session is conceived as a single multimedia session.
Multimedia IMS session:
a multimedia session that uses only the IMS/PS domain to transport both real-time and non-real-time media components.
CSI origination:
the case when a UE initiates a CS call and subsequently adds an IMS session(s), or vice versa, addressed towards the same user.
CSI termination:
the case when a call to a UE is terminated in the CS domain (e.g. for real-time component), while an IMS session(s) from the same originating user and towards the same UE is terminated in the IMS/PS domain.
IMS origination:
the case when a UE initiates an IMS session(s) and the CS domain is not involved in the originating part of the session(s).
IMS termination:
the case when an IMS session(s) is terminated in the IMS/PS domain and the CS domain is not involved in the terminating part of the session(s).
3.2 Abbreviations p. 8
For the purposes of the present document, the following abbreviations apply:
AS
Application Server
CSI
Combination of CS and IMS services
DTM
Dual Transfer Mode
IAM
Initial Address Message
CON
Connect Message
MRFC
Media Resource Function; Control part
MRFP
Media Resource Function; Physical Part
MSRP
Message Session Relay Protocol
RAT
Radio Access Technology
RTP
Real-time Transfer Protocol
