Content for TR 23.752 Word version: 17.0.0
5 Key Issues
6 Solutions
6.0 Mapping of Solutions to Key Issues
6.1 Solution #1: Restricted direct discovery
6.2 Solution #2: V2X based solution for ProSe direct discovery
6.3 Solution #3: Solution for ProSe 5G Direct Discovery using PC5 communication channel
6.4 Solution #4: PC5 group communication for commercial services
6.5 Solution #5: ProSe communication based on V2X communication over PC5
6.6 Solution #6: Layer-3 UE-to-Network Relay
6.7 Solution #7: Indirect Communication via Layer 2 UE-to-Network Relay UE
6.8 Solution #8: UE-to-UE Relay Selection Without Relay Discovery
6.9 Solution #9: Connection establishment via UE-to-UE Layer-2 Relay
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5 Key Issues p. 15
5.1 Key Issue #1: ProSe Direct discovery p. 15
5.2 Key Issue #2: Support for NR PC5 ProSe communication p. 16
5.3 Key Issue #3: Support of UE-to-Network Relay p. 16
5.4 Key Issue #4: Support of UE-to-UE Relay p. 17
5.5 Key Issue #5: Support direct communication path selection between PC5 and Uu p. 18
5.6 Key Issue #6: Support direct communication path switching between PC5 and Uu p. 18
5.7 Key Issue #7: Charging for PC5 p. 19
5.8 Key Issue #8: Support of PC5 Service Authorization and Policy/Parameter Provisioning p. 19
6 Solutions p. 20
6.0 Mapping of Solutions to Key Issues p. 20
6.1 Solution #1: Restricted direct discovery p. 21
6.1.1 Description p. 21
6.1.2 Procedures p. 21
6.1.2.1 Procedure for authorization and provision p. 21
6.1.2.2 Procedure for announcing and monitoring discovery message p. 22
6.1.3 Impacts on services, entities and interfaces p. 23
6.2 Solution #2: V2X based solution for ProSe direct discovery p. 23
6.2.1 Description p. 23
6.2.1.1 General p. 23
6.2.2 Procedures p. 24
6.2.2.0 Policy/Parameter Description p. 24
6.2.2.1 General p. 25
6.2.2.2 Implementing ProSe Direct Discovery using the ProSe Direct Communication Procedure p. 25
6.2.3 Impacts on services, entities and interfaces p. 27
6.3 Solution #3: Solution for ProSe 5G Direct Discovery using PC5 communication channel p. 27
6.3.1 Description p. 27
6.3.2 Procedures p. 28
6.3.2.1 Procedures for Direct Discovery Model A and B p. 28
6.3.2.2 Procedures for assignment of ProSe identifiers p. 29
6.3.3 Impacts on services, entities and interfaces p. 29
6.4 Solution #4: PC5 group communication for commercial services p. 30
6.4.1 Description p. 30
6.4.1.1 General p. 30
6.4.1.2 Differences from groupcast mode of V2X communication over PC5 reference point p. 30
6.4.2 Procedures p. 31
6.4.2.0 General p. 31
6.4.2.1 PC5 group communication establishment for commercial services p. 31
6.4.2.2 PC5 group communication termination for commercial services p. 33
6.4.2.3 PC5 group communication update (group member leaving) for commercial services p. 33
6.4.2.4 PC5 group communication update (new member joining) for commercial services p. 33
6.4.3 Impacts on services, entities and interfaces p. 34
6.5 Solution #5: ProSe communication based on V2X communication over PC5 p. 34
6.5.1 Description p. 34
6.5.2 Procedures p. 34
6.5.3 Impacts on services, entities and interfaces p. 35
6.6 Solution #6: Layer-3 UE-to-Network Relay p. 35
6.6.1 Description p. 35
6.6.2 Procedures p. 36
6.6.3 Impacts on services, entities and interfaces p. 39
6.7 Solution #7: Indirect Communication via Layer 2 UE-to-Network Relay UE p. 39
6.7.1 Introduction p. 39
6.7.2 Functional Description p. 39
6.7.2.1 General p. 39
6.7.2.2 Control and User Plane Protocols p. 39
6.7.2.3 Network Selection p. 39
6.7.2.4 Authorization and provisioning p. 39
6.7.2.5 Registration and Connection Management p. 40
6.7.2.5.1 Registration Management p. 40
6.7.2.5.2 Connection Management p. 40
6.7.2.5.3 NAS level Congestion Control p. 41
6.7.2.6 QoS p. 41
6.7.2.7 Mobility p. 41
6.7.2.7.1 Mobility Restrictions p. 41
6.7.2.7.2 Other p. 42
6.7.2.8 Security p. 43
6.7.2.9 UE-to-Network Relay Discovery and Selection p. 44
6.7.2.10 Path Selection p. 44
6.7.3 Procedures p. 44
6.7.4 Impacts on services, entities and interfaces p. 45
6.8 Solution #8: UE-to-UE Relay Selection Without Relay Discovery p. 46
6.8.1 Description p. 46
6.8.2 Procedures p. 47
6.8.2.1 UE-to-UE relay discovery and selection is integrated into the unicast link establishment procedure (Alternative 1) p. 47
6.8.2.2 UE-to-UE relay discovery and selection is integrated into Model B direct discovery procedure (Alternative 2) p. 48
6.8.3 Impacts on services, entities and interfaces p. 50
6.9 Solution #9: Connection establishment via UE-to-UE Layer-2 Relay p. 50
6.9.1 Description p. 50
6.9.2 Procedures p. 51
6.9.2.1 Connection establishment p. 51
6.9.2.1.1 Connection establishment integrating UE-to-UE relay discovery and selection p. 51
6.9.2.1.2 Connection establishment after UE-to-UE relay discovery and selection p. 53
6.9.2.2 Connection Management p. 54
6.9.3 Impacts on services, entities and interfaces p. 55
