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TR 29.863 (CT3) ★
Feasibility Study
for the Multimedia Inter-Working
between the IP Multimedia Core Network (CN) Subsystem (IMS)
and Circuit Switched (CS) Networks

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V8.2.0 (Wzip) 2008/03 68 p.

V7.2.0 2007/06 58 p.

Rapporteur: Mr. Holm, Jan

This TR provides a feasibility study for the interworking of multimedia calls between the IP Multimedia CN Subsystem and CS networks (i.e. PSTN, ISDN and GSM/UMTS CS networks).

This TR studies and outlines different solutions and functionality required within the MGW to deliver the user plane aspects between IM CN subsystems and CS networks for support of basic multimedia calls. It also outlines the solutions and functionality required within the MGCF and SGW to deliver the control plane aspects between IM CN subsystems and CS networks to support basic multimedia calls.

This TR also studies the MONA interworking impacts, and which parts of MONA are feasible, or even possible, to interwork.

The user plane interworking necessary to cover the basic multimedia calls is also outlined and studied.

The different aspects studied for the different scenarios should encompass the transport protocol, transcoding and signalling issues for negotiation and mapping of bearer capabilities and QoS information.

full Table of Contents for TR 29.863 Word version: 8.2.0

1 Scope Word-p. 7

3 Definitions and abbreviations Word-p. 8

3.1 Definitions

3.2 Abbreviations Word-p. 9

4 Basic Multimedia calls inter-working between the IMS and CS Networks scenarios

4.1 Overview of Relevant CS-Domain Protocols

4.2 Overview of Relevant PS-Domain Protocols Word-p. 10

5 Control plane inter-working Word-p. 11

5.2 Functionalities required in the MGCF for multimedia calls support

5.3 IM CN subsystem originated session

5.3.1 Preconditions used at IMS side

5.3.1.1 Interactions between H.245 or MONA and SIP/SDP

5.3.1.2 Early media at the CS side through-connected Word-p. 13

5.3.1.3 Early media at the CS side not through-connected Word-p. 14

5.3.1.3.1 BICC with SCUDIF

5.3.1.3.2 Non-SCUDIF case (ISUP or BICC without SCUDIF) Word-p. 15

5.3.2 Preconditions not used at IMS side Word-p. 17

5.3.2.1 Interactions between H.245 or MONA and SIP/SDP

5.3.2.2 Early media at the CS side through-connected Word-p. 19

5.3.2.3 Early media at the CS side not through-connected Word-p. 20

5.3.2.3.1 BICC with SCUDIF

5.3.2.3.2 Non-SCUDIF case (ISUP or BICC without SCUDIF) Word-p. 21

5.4 CS network originated session Word-p. 23

5.4.1 Interactions between SIP/SDP and H.245 or MONA

5.4.1.1 Normal Call setup

5.4.1.2 Call setup if multimedia call can not be recognized in an unambiguous manner Word-p. 24

5.4.2 Preconditions used by IMS terminal

5.4.2.1 Early media at the CS side through-connected

5.4.2.2 Early media at the CS side not through-connected Word-p. 25

5.4.2.2.1 BICC with SCUDIF

5.4.2.2.2 Non-SCUDIF case (ISUP or BICC without SCUDIF) Word-p. 26

5.4.3 Preconditions not used by IMS terminal Word-p. 28

5.4.3.1 Early media at the CS side through-connected

5.4.3.2 Early media at the CS side not through-connected Word-p. 29

5.4.3.2.1 BICC with SCUDIF

5.4.3.2.2 Non-SCUDIF case (ISUP or BICC without SCUDIF) Word-p. 30

5.4.4 CS originated - IM CN transit - CS terminated Word-p. 32

5.5 Service change Word-p. 33

5.5.1.1 IM CN subsystem originated change

5.5.1.1.1 Change from multimedia to speech

5.5.1.1.2 Change from speech to multimedia Word-p. 34

5.5.1.2 CS network originated change Word-p. 35

5.5.1.2.1 Change from multimedia to speech

5.5.1.2.2 Change from speech to multimedia

5.5.2 Non-SCUDIF case (ISUP or BICC without SCUDIF) Word-p. 36

5.5.2.1 Change from multimedia to speech

5.5.2.2 Change from speech to multimedia Word-p. 37

5.6 Call release Word-p. 38

5.6.1 Call release initiated from the IM CN subsystem side

5.6.2 Call release initiated from the CS network side Word-p. 39

5.6.3 Call release initiated from the interworking node

6 User plane interworking Word-p. 40

6.1 Functionalities required in the IM-MGW for multimedia calls support

7 MGCF and IM-MGW interactions

7.1 H.248 Context Model

7.1.1 Context model comparison Word-p. 42

7.1.1.1 Context with separate H.248 RTP Terminations (T3 + T4)

7.1.1.2 Context with combined H.248 RTP Termination (T3)

7.1.1.3 Comparison conclusion Word-p. 43

7.2 H.245 Termination at the IM-MGW

7.2.1 Conveying H.245 related information over the Mn interface

7.2.1.1 Call establishment procedure

7.2.1.2 Procedure of H.245 indication message Word-p. 45

7.2.1.2.1 Function Not Understood / Function Not Supported message

7.2.1.2.2 Jitter Indication message Word-p. 46

7.2.1.2.3 User Input Indication message

7.2.1.3 Procedure of H.245 Command message Word-p. 47

7.2.1.3.1 Flow control command

7.2.1.3.2 End Session Command Word-p. 48

7.2.1.4 Advantages of H.245 Termination at the IM-MGW and Conveying H.245 related information over the Mn interface

7.2.1.5 Mn procedure for ending the H.245 session Word-p. 49

7.2.1.5.1 H.245 session end initiated from the MGCF

7.2.1.5.2 H.245 session end initiated from the CS network side

7.2.2 Conveying selected H.245 messages over the Mn interface

7.2.2.1 Conclusion on this proposal Word-p. 50

7.2.3 Mn packages

7.3 H.245 Termination at the MGCF

7.3.1 Transport of H.245 messages between the MGCF and IM-MGW

7.3.1.1 Conveying H.245 messages over the Mn interface

7.3.1.1.1 From MGCF to IM-MGW

7.3.1.1.2 From IM-MGW to MGCF Word-p. 51

7.3.1.2 Conveying H.245 messages using separate SCTP association

7.3.1.3 Comparison conclusion

7.3.2 Mn packages

7.3.3 Procedure for H.245 termination at the MGCF Word-p. 52

7.3.3.1 Call establishment procedure

7.3.3.2 Procedure of H.245 indication message Word-p. 54

7.3.3.2.1 Function Not Understood / Function Not Supported message

7.3.3.2.2 Jitter Indication message Word-p. 55

7.3.3.2.3 User Input Indication message

7.3.3.3 Procedure of H.245 Command message Word-p. 56

7.3.3.3.1 Flow control command

7.3.3.3.2 End Session Command Word-p. 57

7.3.3.4 Advantages of H.245 termination at the MGCF Word-p. 58

7.3.3.5 Mn procedure for ending the H.245 session

7.4 Media Oriented Negotiation Acceleration (MONA)

7.4.2 Mn Interactions for MONA preference messages Word-p. 60

7.4.3 Mn Interactions for MONA MPCs Word-p. 63

7.4.4 Mn Interactions for MONA SPCs Word-p. 64

7.4.4.1 General

7.4.4.2 Transport from MGCF to IM-MGW

7.4.4.3 Transport from IM-MGW to MGCF Word-p. 65

7.4.5 Mn Interactions for fallback from MONA procedures to standard H.324 setup Word-p. 66

8 Conclusions and recommendations Word-p. 67

A Change history Word-p. 68