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Content for TR 23.893 Word version: 8.0.0

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4 Architectural Requirements and Assumptions p. 7

4.1 Basic Assumptions p. 7

4.2 Architectural Requirements p. 8

4.3 Service Requirements p. 9

5 Multimedia Session Continuity Scenarios p. 9

5.1 General p. 9

5.2 PS-PS session continuity p. 9

5.3 PS-PS session continuity in conjunction with PS-CS continuity p. 10

5.4 Mobility of media components of a session between different terminals under the control of the same user p. 11

5.4.1 Mobility of media components of a session between different terminals under the control of the same user without keep control mode p. 12

5.4.2 Mobility of media components of a session between different terminals under the control of the same user using keep control mode and release control mode p. 14

6 Architecture p. 16

6.1 General Principles and Description p. 16

6.2 MMSC Architecture Reference Model p. 16

6.2.1 MMSC AS p. 17

6.2.2 ICS AS p. 17

6.2.3 MMSC UE p. 18

6.2.4 Reference points p. 18

6.2.4.1 MMSC AS - S-CSCF, ICCF - S-CSCF reference point (ISC) p. 18

6.2.4.2 MMSC AS - MMSC UE reference point (V1) p. 18

6.3 Session Anchoring p. 18

6.3.1 Multimedia sessions originated by MMSC subscribers p. 18

6.3.2 Multimedia sessions terminated to MMSC subscribers p. 18

6.4 Session Transfer p. 19

6.4.1 Multimedia Session Transfer Information p. 19

6.5 Information flows p. 21

6.5.1 MMSC Origination and Termination p. 21

6.5.1.1 CS Origination p. 21

6.5.1.2 CS Termination p. 22

6.5.1.3 PS and CS Combined Origination p. 23

6.5.1.4 PS and CS Combined Termination p. 24

6.5.2 Information flow for providing PS-PS session continuity p. 25

6.5.2.1 PS-PS session continuity with P-CSCF change and full media transfer p. 25

6.5.2.2 PS-PS session continuity with P-CSCF change and partial media transfer p. 27

6.5.2.3a PS-PS session continuity with full media transfer with no P-CSCF change and no change in Signalling address p. 27

6.5.2.3b PS-PS session continuity with full media transfer with no P-CSCF change and with change in Signalling address p. 29

6.5.2.4a PS-PS session continuity with partial media transfer with no P-CSCF change and no change in Signalling address p. 31

6.5.2.4b PS-PS session continuity with partial media transfer with no P-CSCF change and with change in Signalling address p. 31

6.5.3 Information flows for PS-PS session continuity in conjunction with PS-CS session continuity p. 31

6.5.3.1 Session transfer: the multi-media session transferred to combined sessions p. 31

6.5.3.2 The two split sessions transferred into one multimedia session over another access p. 33

6.5.4 Information flow for PS-CS session continuity p. 35

6.5.4.1 Session transfer: the real time media component (video and speech) transferred to the CS access p. 35

6.5.5 Information flow for providing UE Transfer p. 36

6.5.5.1 Information flow for transferring media components to different UEs p. 36

6.5.5.1.1 Alternative 1 p. 36

6.5.5.1.2 Alternative 2 p. 38

6.5.5.1.3 Flow for transferring media components to different UEs p. 40

6.5.5.2 Information flow for retrieving media components from different UEs p. 42

6.5.5.2.1 Alternative 1 p. 42

6.5.5.2.2 Alternative 2 p. 44

6.5.5.3 Signalling flow for adding new media components to different UEs p. 46

6.5.5.3.1 Alternative 1 p. 46

6.5.5.4 Information flow for removing media components from different UEs p. 48

6.5.5.4.1 Alternative 1 p. 48

6.5.5.5 Information flow for addition of media components with redirection at the terminating side p. 50

6.5.5.5.1 Alternative 1 p. 50

6.6 Network-initiated Multimedia Session Transfer p. 51

6.6.1 General p. 51

6.6.2 Session Continuity operator policies p. 51

6.6.2.1 Characteristics of Session Continuity operator policies p. 52

6.6.2.2 Update of Session Continuity operator policies p. 52

7 Impacts and Enhancements to the IM CN subsystem p. 53

7.1 MMSC and CSI interworking p. 53

8 Coexistence and/or potential interactions with underlying mobility solutions p. 54

8.1 General p. 54

8.2 Impact of underlying mobility mechanisms on IMS p. 54

8.2.1 Access Network Info p. 54

8.2.2 P-CSCF Discovery p. 55

8.2.3 Mobility Scenarios with P-CSCF Change p. 55

8.2.3.1 Non-roaming case p. 55

8.2.3.2 Roaming case p. 56

8.2.4 PS-PS session continuity with P-CSCF Change under IP-level mobility support p. 57

9 Conclusion p. 59

9.1 Conclusion on multimedia session continuity scenarios p. 59

9.2 Conclusion on MMSC architecture and anchoring solution p. 59

9.3 Conclusion on session transfer operator policy p. 60

9.4 Conclusion on the relationship between ICS and MMSC p. 60

9.5 Conclusion on specification of session split/merger functionality p. 60

9.6 Conclusion on T-ADS and session split/merger functionality for MMSC and ICS p. 60

9.7 Conclusion on the applicable scope of MMSC p. 60

9.8 Conclusion on Single Radio MMSC p. 61

9.9 Conclusion on Session Transfer Information p. 61

9.10 Conclusion on UE Transfer information flows p. 61

9.11 Conclusion on Keep and Release Control Mechanism in UE Transfer Mode p. 61

$ Change history p. 62