Content for TR 23.757 Word version: 17.0.0
5 Key Issues
6 Solutions
6.0 Mapping of solutions to key issues
6.1 Solution #1: Multicast service levels
6.2 Solution #2: MBS Session setup using flexible radio resources
6.3 Solution #3: Integrated Multicast and Unicast Transport
6.4 Solution #4: Multicast operations with dedicated MBS network functions
6.5 Solution #5: Broadcast Session Start
6.6 Solution #6: Multicast service initiation
6.7 Solution #7: Local multicast service discovery and provisioning
6.8 Solution #8: Dynamic multicast/broadcast transmission
6.9 Solution #9: Broadcast service initiation
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5 Key Issues p. 16
5.1 Key Issue #1: MBS session management p. 16
5.1.1 Description p. 16
5.2 Key Issue #2: Definition of Service Levels p. 17
5.2.1 Description p. 17
5.3 Key Issue #3: Levels of authorization for Multicast communication services p. 17
5.3.1 Description p. 17
5.4 Key Issue #4: QoS level support for Multicast and Broadcast communication services p. 17
5.4.1 Description p. 17
5.5 Key Issue #5: Support of Broadcast TV Video and Radio communication services p. 18
5.5.1 Description p. 18
5.6 Key Issue #6: Local MBS service p. 18
5.6.1 Description p. 18
5.7 Key Issue #7: Reliable delivery method switching between unicast and multicast p. 19
5.7.1 Description p. 19
5.8 Key Issue #8: Reliable switching between unicast and broadcast delivery methods p. 19
5.8.1 Description p. 19
5.9 Key Issue #9: Minimizing the interruption of public safety services upon transition between NR/5GC and E-UTRAN/EPC p. 19
5.9.1 Description p. 19
6 Solutions p. 20
6.0 Mapping of solutions to key issues p. 20
6.1 Solution #1: Multicast service levels p. 21
6.1.1 Functional description p. 21
6.1.2 Procedures p. 22
6.1.3 Impacts on services, entities and interfaces p. 22
6.2 Solution #2: MBS Session setup using flexible radio resources p. 22
6.2.1 Functional Description p. 22
6.2.2 Procedures p. 25
6.2.2.0 General p. 25
6.2.2.1 Session Join p. 25
6.2.2.2 Session Start p. 27
6.2.2.2a Session Start with NG-RAN not supporting 5MBS and 5GC Individual MBS traffic delivery applied to the MBS session p. 29
6.2.2.2b Session Join using user plane Join p. 30
6.2.2.3 MCPTT: New Group Call p. 30
6.2.2.4 MCPTT: Ongoing Group Call p. 31
6.2.2.5 Session Leave p. 33
6.2.2.6 Session Stop p. 35
6.2.2.7 Session Delete p. 36
6.2.3 Impacts on services, entities and interfaces p. 37
6.3 Solution #3: Integrated Multicast and Unicast Transport p. 38
6.3.1 Functional Description p. 38
6.3.1.1 System Architecture p. 38
6.3.1.2 Multicast Session Context and Multicast flow characteristics p. 38
6.3.2 Procedures p. 40
6.3.2.1 Multicast context and Multicast flow setup/modification via PDU Session Modification procedure p. 40
6.3.2.2 Multicast group configuration p. 44
6.3.2.2.1 General p. 44
6.3.2.2.2 Initial Multicast group configuration via NEF p. 45
6.3.2.2.2a Updated Multicast group configuration via NEF p. 46
6.3.2.2.3 Example of AF use of Multicast group configuration via NEF in combination with SIP signalling p. 47
6.3.2.2.4 Example of mission critical service activation via MSF and MSF interaction with MBS transport. p. 47
6.3.2.2.5 UE authorization check p. 49
6.3.2.3 UE Leaves Multicast Service via PDU Session Modification Procedure p. 50
6.3.2.4 Inter-RAN node MBS session Handover p. 52
6.3.3 Impacts on services, entities and interfaces p. 52
6.4 Solution #4: Multicast operations with dedicated MBS network functions p. 53
6.4.1 Functional description p. 53
6.4.1.1 General p. 53
6.4.1.2 User plane p. 54
6.4.1.3 Multicast Service Context and Multicast Session Context p. 55
6.4.2 Procedures p. 56
6.4.2.1 High-level procedures for multicast communication service p. 56
6.4.2.2 User Multicast Service Create p. 58
6.4.2.3 User Multicast Service Release p. 61
6.4.2.4 User Multicast Service Update p. 61
6.4.2.5 User Multicast Session Join via AN p. 62
6.4.2.6 User Multicast Session Join via CN p. 63
6.4.2.7 User Multicast Session Leave p. 64
6.4.2.8 Multicast Session Start p. 65
6.4.2.9 Multicast Session Stop p. 66
6.4.2.10 Multicast Session Shared Leg Release p. 67
6.4.3 Impacts on services, entities and interfaces p. 68
6.5 Solution #5: Broadcast Session Start p. 69
6.5.1 Functional description p. 69
6.5.2 Procedures p. 71
6.5.3 Impacts on services, entities and interfaces p. 73
6.6 Solution #6: Multicast service initiation p. 74
6.6.1 Functional description p. 74
6.6.2 Procedures p. 75
6.6.2.1 MBS Session initiation procedure p. 75
6.6.2.2 MBS Session leave procedure p. 76
6.6.2.3 MBS Session release procedure p. 77
6.6.3 Impacts on services, entities and interfaces p. 78
6.7 Solution #7: Local multicast service discovery and provisioning p. 79
6.7.1 Functional description p. 79
6.7.2 Procedures p. 79
6.7.3 Impacts on services, entities and interfaces p. 81
6.8 Solution #8: Dynamic multicast/broadcast transmission p. 81
6.8.1 Functional Description p. 81
6.8.1.1 General p. 81
6.8.1.2 System Architecture p. 81
6.8.2 Procedures p. 82
6.8.3 Impacts on services, entities and interfaces p. 83
6.9 Solution #9: Broadcast service initiation p. 83
