Content for TR 23.700-03 Word version: 19.0.0
5 Key Issues p. 9
5.1 Key Issue #1: Support of multi-hop UE-to-Network Relays p. 9
5.2 Key Issue #2: Support of Layer-3 multi-hop UE-to-UE Relays p. 10
6 Solutions p. 11
6.0 Mapping of Solutions to Key Issues p. 11
6.1 Solution #1: Architecture enhancement to support 5G ProSe multi-hop UE-to-Network Relays p. 11
6.1.1 Description p. 11
6.1.2 Procedures p. 12
6.1.2.1 Relay Discovery p. 12
6.1.2.2 Authentication and authorization for multi-hop relay operation p. 16
6.1.2.3 Relay Selection/re-selection p. 16
6.1.2.4 PC5 Link establishment and management p. 16
6.1.2.4.1 Layer-2 Link establishment and management p. 16
6.1.2.4.2 IP address/prefix management for Layer-3 UE-to-Network Relay p. 17
6.1.2.5 Relay reselection and mobility support p. 17
6.1.2.6 Support of End-to-end QoS management p. 18
6.1.2.6.1 General p. 18
6.1.2.6.2 Support End-to-end QoS management for multi-hop Layer-3 UE-to-Network Relays p. 19
6.1.2.7 Support of Layer-2 multi-hop UE-to-Network Relay operation p. 20
6.1.2.8 Additional parameters announcement procedure p. 20
6.1.3 Impacts on services, entities and interfaces p. 22
6.2 Solution #2: Multi-hop 5G ProSe UE-to-Network Relay Discovery and Layer-3 Communication p. 23
6.2.1 Description p. 23
6.2.1.1 General p. 23
6.2.1.2 Enhancements to QoS handling p. 24
6.2.2 Procedures p. 26
6.2.2.1 5G ProSe multi-hop UE-to-Network Relay Discovery p. 26
6.2.2.1.1 5G ProSe multi-hop UE-to-Network Relay Discovery with Model A p. 26
6.2.2.1.2 5G ProSe multi-hop UE-to-Network Relay Discovery with Model B p. 27
6.2.2.2 5G ProSe Communication via multi-hop Layer-3 UE-to-Network Relay p. 28
6.2.3 Impacts on services, entities and interfaces p. 34
6.3 Solution #3: Architecture enhancement to support Layer-3 multi-hop UE-to-UE Relays p. 34
6.3.1 Description p. 34
6.3.2 Procedures p. 35
6.3.3 Impacts on services, entities and interfaces p. 36
6.4 Solution #4: Layer-3 Multi-hop Relay based on MANET p. 37
6.4.1 Key Issue mapping p. 37
6.4.2 Description p. 37
6.4.3 Procedures p. 39
6.4.4 Impacts on services, entities and interfaces p. 41
6.5 Solution #5: Support of Multi-hop UE-to-UE Relay Discovery p. 41
6.5.1 Description p. 41
6.5.2 Procedures p. 42
6.5.3 Impacts on services, entities and interfaces p. 43
6.6 Solution #6: Multi-hop extension of 5G ProSe UE-to-UE Relay p. 43
6.6.1 Description p. 43
6.6.2 Procedures p. 45
6.6.2.1 5G ProSe multi-hop UE-to-UE Relay Discovery p. 45
6.6.2.1.1 Multi-hop U2U Relay discovery using model A p. 45
6.6.2.1.2 Multi-hop U2U Relay discovery using model B p. 46
6.6.2.2 5G ProSe Communication via 5G ProSe multi-hop Layer-3 UE-to-UE Relay p. 47
6.6.2.3 5G ProSe multi-hop Layer-3 UE-to-UE Relay Reselection with negotiated U2U relay reselection procedure p. 48
6.6.3 Impacts on services, entities and interfaces p. 50
6.7 Solution #7: 5G ProSe Multi-hop Layer-3 UE-to-Network Relay Communication with and without N3IWF support p. 50
6.7.1 Description p. 50
6.7.2 Procedures p. 52
6.7.2.1 5G ProSe multi-hop UE-to-Network Relay Discovery p. 52
6.7.2.1.1 5G ProSe multi-hop UE-to-Network Relay Discovery with Model B p. 52
6.7.2.1.2 5G ProSe multi-hop UE-to-Network Relay Discovery with Model A p. 54
6.7.2.2 5G ProSe Communication via multi-hop 5G ProSe Layer-3 UE-to-Network Relay without N3IWF support p. 56
6.7.2.3 QoS handling for 5G ProSe Multi-hop UE-to-Network Relay without N3IWF p. 57
6.7.2.4 5G ProSe Communication via multi-hop 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support p. 58
6.8 Solution #8: Layer-3 multi-hop UE-to-Network Relay building on top of Solution #3 p. 60
6.8.1 Description p. 60
6.8.2 Procedures p. 61
6.8.3 Impacts on services, entities and interfaces p. 61
6.9 Solution#9 for Key Issue #2 p. 61
6.9.1 Description p. 61
6.9.2 Procedures p. 62
6.9.2.1 Multi-hop UE-to-UE Relay discovery with Model B p. 62
6.9.2.2 Layer-2 link establishment communication via multi-hop UE-to-UE Relays p. 65
6.9.2.3 QoS handling for multi-hop UE-to-UE Relays p. 67
6.9.3 Impacts to Services, Entities and Interfaces p. 68
6.10 Solution #10: Support for Multi-hop UE-to-UE Relay Discovery with max hop restriction p. 68
7 Overall Evaluation p. 72
8 Conclusions p. 72
8.1 Conclusions for KI#1 p. 72
8.2 Conclusions for KI#2 p. 73
$ Change history p. 75
