7.10 Multimedia interworking between ims and cs networks (miw-ims) uid_713024

Resources: C3,C4

References

Document	Title/Contents
WID(s)
CP-070729	C3 WID on Multimedia interworking between IM CN subsystem and circuit switched networks
Impacted Specifications
TR 29.863	Feasibility Study for the multimedia inter-working between the IP Multimedia Core Network (CN) Subsystem (IMS) and Circuit Switched (CS) networks - C3
TS 29.163	Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks - C3
TS 29.332	Media Gateway Control Function (MGCF) - IM Media Gateway (IM-MGW); Mn interface - C4
New Dedicated Specifications/Reports
-	-

Supporting Individual Members: Nortel, Vodafone, Orange, Nokia, Siemens, Ericsson, Huawei.

UID	Name	Resource	Hyperlink	TS_TR
713024	Multimedia interworking between IMS and CS networks	S2,C3,C4	CP-070729	-
7013	Note: Stages 1 and 2 defined in earlier Release	S2	-	-
7014	Stage 3 of MW-IMS	C3	CP-070096	29.863, 29.163
380021	Stage 3 for MW-IMS, MONA extension	C3	CP-070729	29.863, 29.163
380022	Mn interface (MGCF – IM MGW)	C4	CP-070729	29.332

NOTE: SA1 Stage 1 and SA2 Stage 2 have been defined in earlier Releases.

Within UMTS, the capability of IP-based Multimedia (IM) services enables supporting basic multimedia calls to and from Circuit Switched (CS) networks (i.e. PSTN, ISDN and GSM/UMTS CS networks). These multimedia calls will require interworking functions within the IMS.

The UMTS architecture includes Media Gateway (MGW) functionality for interworking between the GGSN Gi reference point and CS networks for the user plane, and Media Gateway Control Function (MGCF) and Signalling Gateway (SGW) functionality to allow interworking between the Call Session Control Function (CSCF) and CS networks in the control plan.

This work provides functionality for supporting basic multimedia calls required within the:

• MGW to deliver the user plane aspects between IMS and CS networks;

• MGCF and SGW to deliver the control plane aspects between IMS and CS networks;

In order to support basic multimedia calls, the work addressed the control plane interworking:

• between the AMR codec used in the IMS and possibly other codec types used in CS networks) in order to support basic multimedia calls;

• the mapping required between 3GPP profile of SIP and ISUP/BICC, SDP, 324M control protocols, if required) to enable the IMS to communicate with CS networks;

The areas addressed encompass transport protocol, transcoding and signalling issues for negotiation and mapping of bearer capabilities and QoS information.

As a first step, CT3 Rel-7 TR 29.863 was continued to study all implications of the user and control plane interworking.

Subsequently the functionality was added:

• Stage 3 of MW-IMS and Stage 3 for MW-IMS (MONA extension) to existing CT3 TS 29.163;

Mn interface (MGCF – IM MGW) to existing CT4 TS 29.332;