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Table of Contents for  TS 23.304  Word version:  19.5.0

1Scope  p. 12
2References  p. 12
3Definitions of terms and abbreviations  p. 13
3.1Terms  p. 13
3.2Abbreviations  p. 15
4Architecture model and concepts  p. 15
4.1General concept  p. 15
4.2Architectural reference model  p. 16
4.2.1Non-roaming reference architecture  p. 16
4.2.2Roaming reference architecture  p. 17
4.2.3Inter-PLMN reference architecture  p. 18
4.2.4AF-based service parameter provisioning  p. 20
4.2.5Reference points  p. 21
4.2.6Service-based interfaces  p. 22
4.2.75G ProSe UE-to-Network Relay reference architecture  p. 22
4.2.7.15G ProSe Layer-3 UE-to-Network Relay reference architecture  p. 22
4.2.7.1A5G ProSe Multi-hop Layer-3 UE-to-Network Relay reference architecture |R19|  p. 24
4.2.7.25G ProSe Layer-2 UE-to-Network Relay reference architecture  p. 25
4.2.7.2a5G ProSe Multi-hop Layer-2 UE-to-Network Relay reference architecture |R19|  p. 25
4.2.85G ProSe UE-to-UE Relay reference architecture |R18|  p. 26
4.2.8A5G ProSe Multi-hop UE-to-UE Relay reference architecture |R19|  p. 26
4.2.9Support for 5G ProSe in NPNs |R19|  p. 27
4.2.9.1Support for 5G ProSe in SNPN  p. 27
4.2.9.2Support for 5G ProSe in conjunction with CAG in PNI-NPN  p. 28
4.3Functional Entities  p. 29
4.3.1UE  p. 29
4.3.25G DDNMF  p. 30
4.3.2.1General  p. 30
4.3.2.25G DDNMF Discovery  p. 31
4.3.3PCF  p. 31
4.3.4AMF  p. 31
4.3.5UDM  p. 32
4.3.6UDR  p. 32
4.3.7NRF  p. 32
4.3.8ProSe Application Server  p. 33
4.3.95G ProSe UE-to-Network Relay  p. 33
4.3.9.1General  p. 33
4.3.9.25G ProSe Layer-3 UE-to-Network Relay  p. 34
4.3.9.35G ProSe Layer-2 UE-to-Network Relay  p. 34
4.3.10SMF  p. 34
4.3.11NEF  p. 35
4.3.125G ProSe UE-to-UE Relay |R18|  p. 35
4.3.12.1General  p. 35
4.3.12.25G ProSe Layer-3 UE-to-UE Relay  p. 35
4.3.12.35G ProSe Layer-2 UE-to-UE Relay  p. 36
4.3.135G ProSe Intermediate UE-to-Network Relay |R19|  p. 36
5High level functionality and features  p. 36
5.1Authorization and Provisioning for ProSe service  p. 36
5.1.1General  p. 36
5.1.1aGeneral principles for applying policy/parameters |R18|  p. 38
5.1.2Authorization and Provisioning for 5G ProSe Direct Discovery  p. 40
5.1.2.1Policy/Parameter provisioning for 5G ProSe Direct Discovery  p. 40
5.1.2.2Principles for applying parameters for 5G ProSe Direct Discovery  p. 41
5.1.3Authorization and Provisioning for 5G ProSe Direct Communication  p. 41
5.1.3.1Policy/Parameter provisioning for 5G ProSe Direct Communication  p. 41
5.1.3.2Principles for applying parameters for 5G ProSe Direct Communication  p. 43
5.1.4Authorization and Provisioning for 5G ProSe UE-to-Network Relay  p. 43
5.1.4.1Policy/Parameter provisioning for 5G ProSe UE-to-Network Relay  p. 43
5.1.4.1aPolicy/Parameter provisioning for 5G ProSe Multi-hop UE-to-Network Relay |R19|  p. 46
5.1.4.2Principles for applying parameters for 5G ProSe UE-to-Network Relay  p. 49
5.1.4.2.1Principles for applying parameters for ProSe UE-to-Network Relay discovery  p. 49
5.1.4.2.1aPrinciples for applying parameters for 5G ProSe Multi-hop UE-to-Network Relay discovery |R19|  p. 49
5.1.4.2.2Principles for applying parameters for 5G ProSe UE-to-Network Relay communication  p. 50
5.1.4.2.2aPrinciples for applying parameters for 5G ProSe Multi-hop UE-to-Network Relay communication |R19|  p. 50
5.1.4.3Network controlled security procedures for 5G ProSe UE-to-Network Relay  p. 50
5.1.4.3.1General  p. 50
5.1.4.3.2Control Plane based security procedures for 5G ProSe UE-to-Network Relay  p. 50
5.1.4.3.3User Plane based security procedures  p. 50
5.1.5Authorization and Provisioning for 5G ProSe UE-to-UE Relay |R18|  p. 51
5.1.5.1Policy/Parameter provisioning for 5G ProSe UE-to-UE Relay  p. 51
5.1.5.1aPolicy/Parameter provisioning for 5G ProSe Layer-3 Multi-hop UE-to-UE Relay |R19|  p. 53
5.1.5.2Principles for applying parameters for 5G ProSe UE-to-UE Relay  p. 55
5.1.5.2.1Principles for applying parameters for ProSe UE-to-UE Relay discovery  p. 55
5.1.5.2.1aPrinciples for applying parameters for 5G ProSe Layer-3 Multi-hop UE-to-UE Relay discovery |R19|  p. 55
5.1.5.2.2Principles for applying parameters for 5G ProSe UE-to-UE Relay communication  p. 55
5.1.5.2.2aPrinciples for applying parameters for 5G ProSe Layer-3 Multi-hop UE-to-UE Relay communication |R19|  p. 55
5.25G ProSe Direct Discovery  p. 55
5.2.1General  p. 55
5.2.25G ProSe Direct Discovery Models  p. 55
5.2.35G ProSe UE-to-Network Relay Discovery  p. 55
5.2.45G ProSe Direct Discovery Characteristics  p. 55
5.2.55G ProSe UE-to-UE Relay Discovery |R18|  p. 56
5.2.65G ProSe Multi-hop UE-to-Network Relay Discovery |R19|  p. 56
5.2.75G ProSe Multi-hop UE-to-UE Relay Discovery |R19|  p. 57
5.35G ProSe Direct Communication  p. 57
5.3.1General  p. 57
5.3.2Broadcast mode 5G ProSe Direct Communication  p. 57
5.3.3Groupcast mode 5G ProSe Direct Communication  p. 57
5.3.4Unicast mode 5G ProSe Direct Communication  p. 58
5.45G ProSe UE-to-Network Relay  p. 58
5.4.15G ProSe Layer-3 UE-to-Network Relay  p. 58
5.4.1.1General  p. 58
5.4.1.25G ProSe Layer-3 UE-to-Network Relay with N3IWF support  p. 59
5.4.1.3Policy control and session binding to support 5G ProSe Layer-3 UE-to-Network Relay without N3IWF  p. 59
5.4.25G ProSe Layer-2 UE-to-Network Relay  p. 60
5.4.3Mobility Restrictions for 5G ProSe UE-to-Network Relaying  p. 60
5.4.4Support of emergency service from 5G ProSe Remote UE via 5G ProSe UE-to-Network Relay |R18|  p. 61
5.4.4.1General  p. 61
5.4.4.2Emergency service from 5G ProSe Remote UE via 5G ProSe Layer-2 UE-to-Network Relay  p. 61
5.4.4.3Emergency service from 5G ProSe Remote UE via 5G ProSe Layer-3 UE-to-Network Relay  p. 62
5.4.55G ProSe Intermediate UE-to-Network Relay |R19|  p. 62
5.4.5.1General  p. 62
5.4.5.25G ProSe Layer-3 Intermediate UE-to-Network Relay  p. 63
5.5IP address allocation  p. 63
5.5.1General  p. 63
5.5.1.1IP address allocation for unicast mode of 5G ProSe direct communication  p. 63
5.5.1.2IP address allocation for broadcast and groupcast modes of 5G ProSe direct communication  p. 63
5.5.1.3IP address allocation for communication with a 5G ProSe Layer-3 ProSe UE-to-Network Relay  p. 63
5.5.1.4IP address allocation for communication with a 5G ProSe Layer-3 UE-to-UE Relay |R18|  p. 64
5.5.2IPv6 Prefix Delegation via DHCPv6 for 5G ProSe Layer-3 UE-to-Network Relay  p. 65
5.6QoS handling  p. 65
5.6.1QoS handling for 5G ProSe Direct Communication  p. 65
5.6.2QoS handling for 5G ProSe UE-to-Network Relay operations  p. 66
5.6.2.1QoS handling for 5G ProSe Layer-3 UE-to-Network Relay without N3IWF  p. 66
5.6.2.2QoS handling for 5G ProSe Layer-3 UE-to-Network relay with N3IWF  p. 68
5.6.2.3QoS handling for 5G ProSe Layer-2 UE-to-Network Relay  p. 69
5.6.2.4QoS handling for 5G ProSe Multi-hop Layer-3 UE-to-Network Relay without N3IWF |R19|  p. 69
5.6.2.4.1General  p. 69
5.6.2.4.2Network initiated QoS Flows  p. 70
5.6.2.4.3Remote UE initiated QoS Flows  p. 70
5.6.3QoS handling for 5G ProSe UE-to-UE Relay operations |R18|  p. 71
5.6.3.1QoS handling for 5G ProSe Layer-3 UE-to-UE Relay  p. 71
5.6.3.2QoS handling for 5G ProSe Layer-2 UE-to-UE Relay  p. 72
5.7Subscription to 5G ProSe  p. 72
5.8Identifiers  p. 74
5.8.1Identifiers for 5G ProSe Direct Discovery  p. 74
5.8.1.0General  p. 74
5.8.1.1ProSe Application ID  p. 74
5.8.1.2Destination Layer-2 ID  p. 74
5.8.1.3Source Layer-2 ID  p. 74
5.8.1.4ProSe Application Code  p. 75
5.8.1.5ProSe Restricted Code  p. 75
5.8.1.6ProSe Query Code  p. 75
5.8.1.7ProSe Response Code  p. 75
5.8.1.8User Info ID  p. 75
5.8.1.9ProSe Discovery UE ID  p. 75
5.8.1.10Restricted ProSe Application User ID  p. 75
5.8.1.11Announcing PLMN ID  p. 75
5.8.1.12Announcer Info  p. 75
5.8.1.13Discoverer Info  p. 75
5.8.1.14Target Info  p. 75
5.8.1.15Discoveree Info  p. 76
5.8.1.16Application Layer Group ID  p. 76
5.8.1.17Monitored PLMN ID |R18|  p. 76
5.8.2Identifiers for 5G ProSe Direct Communication  p. 76
5.8.2.1General  p. 76
5.8.2.2Identifiers for broadcast mode 5G ProSe direct communication  p. 76
5.8.2.3Identifiers for groupcast mode 5G ProSe direct communication  p. 76
5.8.2.4Identifiers for unicast mode 5G ProSe direct communication  p. 77
5.8.3Identifiers for 5G ProSe UE-to-Network Relay  p. 77
5.8.3.1Common identifiers for 5G ProSe UE-to-Network Relay  p. 77
5.8.3.2Identifiers for 5G ProSe Layer-3 UE-to-Network Relay  p. 80
5.8.3.3Identifiers for 5G ProSe Layer-2 UE-to-Network Relay  p. 80
5.8.4Identifiers for 5G ProSe UE-to-UE Relay Discovery |R18|  p. 80
5.8.4.1General  p. 80
5.8.4.2Common identifiers for 5G ProSe UE-to-UE Relay Discovery  p. 81
5.8.5Identifiers for 5G ProSe UE-to-UE Relay Communication with integrated Discovery |R18|  p. 82
5.8.6Identifiers for 5G ProSe Multi-hop UE-to-UE Relay Discovery |R19|  p. 82
5.8.6.1General  p. 82
5.8.6.2Identifiers for 5G ProSe Multi-hop UE-to-UE Relay discovery of IP PDU type  p. 83
5.8.6.3Identifiers for 5G ProSe Multi-hop UE-to-UE Relay discovery of non-IP PDU type  p. 83
5.9Support for 5G ProSe for UEs in limited service state  p. 84
5.10PC5 operation in EPS for Public Safety UE  p. 85
5.11Communication path selection between PC5 and Uu reference points  p. 85
5.12NAS level congestion control for 5G ProSe UE-to-Network Relay  p. 86
5.13Support for PC5 DRX operations  p. 86
5.13.1General  p. 86
5.13.2PC5 DRX operations for 5G ProSe Direct Discovery, 5G ProSe UE-to-Network Relay Discovery and 5G ProSe UE-to-UE Relay Discovery  p. 86
5.13.3PC5 DRX operations for 5G ProSe Direct Communication, 5G ProSe UE-to-Network Relay Communication and 5G ProSe UE-to-UE Relay Communication  p. 86
5.145G ProSe UE-to-UE Relay Communication |R18|  p. 87
5.14.15G ProSe Layer-3 UE-to-UE Relay Communication  p. 87
5.14.25G ProSe Layer-2 UE-to-UE Relay Communication  p. 87
5.14.35G ProSe Layer-3 Multi-hop UE-to-UE Relay communication |R19|  p. 88
5.14.3.1General  p. 88
5.14.3.2IP based 5G ProSe Layer-3 Multi-hop UE-to-UE Relay communication  p. 88
5.15Path switching between two UE-to-Network Relays |R18|  p. 89
5.16Communication path switching between PC5 and Uu reference points |R18|  p. 89
5.17Multi-path communication via Uu and via 5G ProSe UE-to-Network Relay |R18|  p. 91
5.17.1General  p. 91
5.17.2Multi-path communication via direct Uu path and via 5G ProSe Layer-3 UE-to-Network Relay  p. 91
5.18Support of Public Warning Notification Relaying |R18|  p. 91
6Functional description and information flows  p. 92
6.1Control and user plane stacks  p. 92
6.1.1Control Plane  p. 92
6.1.1.1General  p. 92
6.1.1.2UE - UE  p. 92
6.1.1.2.1Discovery plane PC5 interface  p. 92
6.1.1.2.2PC5 Signalling Protocol  p. 93
6.1.1.3UE - 5G DDNMF  p. 93
6.1.1.45G DDNMF - UDM  p. 93
6.1.1.55G DDNMF - 5G DDNMF  p. 94
6.1.1.65G DDNMF - ProSe Application Server  p. 94
6.1.1.75G ProSe UE-to-Network Relay  p. 94
6.1.1.7.15G ProSe Layer-3 UE-to-Network Relay  p. 94
6.1.1.7.25G ProSe Layer-2 UE-to-Network Relay  p. 95
6.1.1.85G ProSe UE-to-UE Relay |R18|  p. 95
6.1.1.8.15G ProSe Layer-2 UE-to-UE Relay  p. 95
6.1.1.8.25G ProSe Layer-3 UE-to-UE Relay  p. 96
6.1.2User Plane  p. 96
6.1.2.1General  p. 96
6.1.2.2UE - UE  p. 96
6.1.2.35G ProSe UE-to-Network Relay  p. 97
6.1.2.3.15G ProSe Layer-3 UE-to-Network Relay  p. 97
6.1.2.3.25G ProSe Layer-2 UE-to-Network Relay  p. 97
6.1.2.45G ProSe UE-to-UE Relay |R18|  p. 98
6.1.2.4.15G ProSe Layer-2 UE-to-UE Relay  p. 98
6.1.2.4.25G ProSe Layer-3 UE-to-UE Relay  p. 98
6.2Procedures for Service Authorization and Provisioning to UE  p. 98
6.2.1General  p. 98
6.2.2PCF based Service Authorization and Provisioning to UE  p. 99
6.2.3PCF discovery  p. 99
6.2.4Procedure for UE triggered ProSe Policy provisioning  p. 99
6.2.5AF-based service parameter provisioning for ProSe over control plane  p. 100
6.35G ProSe Direct Discovery  p. 100
6.3.15G ProSe Direct Discovery with 5G DDNMF  p. 100
6.3.1.1Overview  p. 100
6.3.1.2Overall procedure for 5G ProSe Direct Discovery (Model A)  p. 101
6.3.1.3Overall procedure for 5G ProSe Direct Discovery (Model B)  p. 102
6.3.1.4Discovery Request procedures  p. 103
6.3.1.5Discovery Reporting procedures  p. 104
6.3.1.6Announcing Alert Procedures for restricted discovery  p. 104
6.3.1.7Direct Discovery Update Procedures  p. 104
6.3.25G ProSe Direct Discovery procedures over PC5 reference point  p. 105
6.3.2.1General  p. 105
6.3.2.2Group Member Discovery  p. 106
6.3.2.2.1General  p. 106
6.3.2.2.2Procedure for Group Member Discovery with Model A  p. 107
6.3.2.2.3Procedure for Group Member Discovery with Model B  p. 107
6.3.2.35G ProSe UE-to-Network Relay Discovery  p. 108
6.3.2.3.1General  p. 108
6.3.2.3.2Procedure for 5G ProSe UE-to-Network Relay Discovery with Model A  p. 108
6.3.2.3.3Procedure for 5G ProSe UE-to-Network Relay Discovery with Model B  p. 109
6.3.2.45G ProSe UE-to-UE Relay Discovery |R18|  p. 110
6.3.2.4.1General  p. 110
6.3.2.4.2Procedure for 5G ProSe UE-to-UE Relay Discovery with Model A  p. 110
6.3.2.4.3Procedure for 5G ProSe UE-to-UE Relay Discovery with Model B  p. 111
6.3.2.4.4Candidate 5G ProSe UE-to-UE Relay Discovery  p. 112
6.3.2.4.5Acquiring Direct discovery set by model A discovery  p. 112
6.3.2.55G ProSe Multi-hop UE-to-Network Relay Discovery |R19|  p. 112
6.3.2.5.1General  p. 112
6.3.2.5.2Procedure for 5G ProSe Multi-hop UE-to-Network Relay Discovery with Model A  p. 113
6.3.2.5.3Procedure for Multi-hop 5G ProSe UE-to-Network Relay Discovery with Model B  p. 115
6.3.2.5.4Additional parameters announcement procedure over 5G ProSe Multi-hop UE-to-Network Relay  p. 116
6.3.2.65G ProSe Multi-hop UE-to-UE Relay Discovery |R19|  p. 118
6.3.2.6.1General  p. 118
6.3.2.6.2Procedure for 5G ProSe Multi-hop UE-to-UE Relay discovery of IP PDU type  p. 118
6.3.2.6.3Procedure for 5G ProSe Multi-hop UE-to-UE Relay discovery of non-IP PDU type  p. 120
6.3.2.6.3.1Procedure for Multi-hop 5G ProSe UE-to-UE Relay Discovery of non-IP PDU type with Model A  p. 120
6.3.2.6.3.2Procedure for Multi-hop 5G ProSe UE-to-UE Relay Discovery of non-IP PDU type with Model B  p. 121
6.45G ProSe Direct Communication  p. 123
6.4.1Broadcast mode 5G ProSe Direct Communication  p. 123
6.4.2Groupcast mode 5G ProSe Direct Communication  p. 124
6.4.3Unicast mode 5G ProSe Direct Communication  p. 126
6.4.3.1Layer-2 link establishment over PC5 reference point  p. 126
6.4.3.2Link identifier update for a unicast link  p. 130
6.4.3.3Layer-2 link release over PC5 reference point  p. 131
6.4.3.4Layer-2 link modification for a unicast link  p. 132
6.4.3.5Layer-2 link maintenance over PC5 reference point  p. 133
6.4.3.6Layer-2 link management over PC5 reference point for 5G ProSe UE-to-Network Relay  p. 134
6.4.3.7Layer-2 link management over PC5 reference point for 5G ProSe UE-to-UE Relay |R18|  p. 135
6.4.3.7.1Common part for Layer-2 link management over PC5 reference point for 5G ProSe UE-to-UE Relay  p. 135
6.4.3.7.2Layer-2 link management over PC5 reference point for 5G ProSe Layer-2 UE-to-UE Relay  p. 137
6.4.3.7.3Layer-2 link management over PC5 reference point for 5G ProSe Layer-3 UE-to-UE Relay  p. 137
6.4.3.7.4Layer-2 link management over PC5 reference point for 5G ProSe UE-to-UE Relay Communication with integrated Discovery  p. 138
6.4.3.8Layer-2 link management over PC5 reference point for 5G ProSe Multi-hop UE-to-Network Relay (based on Model A discovery) |R19|  p. 139
6.4.3.8.1Layer-2 Link establishment and management  p. 139
6.4.3.8.2IP address/prefix management for 5G ProSe Layer-3 Multi-hop UE-to-Network Relay  p. 140
6.4.3.8.3Relay reselection and mobility support  p. 140
6.4.3.9Layer-2 link management over PC5 reference point for Multi-hop 5G ProSe UE-to-Network Relay (based on Model B Discovery) |R19|  p. 142
6.4.3.9.1Layer-2 Link establishment and management  p. 142
6.4.3.9.2IP address/prefix management for 5G ProSe Layer-3 Multi-hop UE-to-Network Relay  p. 143
6.4.3.9.3Relay reselection  p. 143
6.4.3.10Layer-2 link management for 5G ProSe Layer-3 Multi-hop UE-to-UE Relay |R19|  p. 144
6.4.3.10.1Layer-2 Link establishment and management for IP PDU type  p. 144
6.4.3.10.2Layer-2 link establishment and management over PC5 reference point for non-IP PDU type  p. 145
6.55G ProSe UE-to-Network Relay Communication  p. 147
6.5.15G ProSe Communication via 5G ProSe Layer-3 UE-to-Network Relay  p. 147
6.5.1.0General |R18|  p. 147
6.5.1.15G ProSe Communication via 5G ProSe Layer-3 UE-to-Network Relay without N3IWF  p. 147
6.5.1.25G ProSe Communication via 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support  p. 149
6.5.1.2.1Connection management via 5G ProSe Layer-3 UE-to-Network Relay with N3IWF support  p. 149
6.5.1.2.2N3IWF selection for 5G ProSe Layer-3 Remote UE procedure  p. 151
6.5.1.2.3Mobility of 5G ProSe Layer-3 Remote UE between Direct and Indirect Network communication path  p. 151
6.5.1.3Additional parameters announcement procedure  p. 151
6.5.1.45G ProSe Communication via Multi-hop 5G ProSe Layer-3 UE-to-Network Relay without N3IWF (based on Model B Discovery) |R19|  p. 153
6.5.1.55G ProSe Communication via Multi-hop 5G ProSe Layer-3 UE-to-Network Relay with N3IWF after Model B Discovery |R19|  p. 154
6.5.25G ProSe Communication via 5G ProSe Layer-2 UE-to-Network Relay  p. 155
6.5.2.1Registration and Connection Management  p. 155
6.5.2.1.1Registration Management  p. 155
6.5.2.1.2Connection Management  p. 155
6.5.2.2Connection establishment  p. 156
6.5.2.3Path switching between direct network communication path and indirect network communication path via 5G ProSe Layer-2 UE-to-Network Relay |R18|  p. 157
6.5.35G ProSe UE-to-Network Relay reselection  p. 157
6.5.45G ProSe Remote UE traffic handling for 5G ProSe UE-to-Network Relay support  p. 157
6.5.5Procedures for Communication Path Switching between Two UE-to-Network Relays |R18|  p. 159
6.5.5.1General  p. 159
6.5.5.2Procedures for Communication Path Switching between UE-to-Network Relays  p. 159
6.6Procedures for Service Authorization to NG-RAN  p. 159
6.6.1General  p. 159
6.6.2Registration procedure  p. 160
6.6.3Service Request procedure  p. 161
6.6.4N2 Handover procedure  p. 161
6.6.5Xn Handover procedure  p. 162
6.6.6Subscriber Data Update Notification to AMF  p. 162
6.6.7Delivery of PC5 QoS parameters for ProSe to NG-RAN  p. 162
6.75G ProSe UE-to-UE Relay Communication |R18|  p. 163
6.7.15G ProSe Communication via 5G ProSe Layer-3 UE-to-UE Relay  p. 163
6.7.1.1Layer-2 link establishment for PC5 communication via 5G ProSe Layer-3 UE-to-UE Relay  p. 163
6.7.1.2Link identifier update for PC5 communication via 5G ProSe Layer-3 UE-to-UE Relay  p. 166
6.7.1.3Layer-2 link release for PC5 communication via 5G ProSe Layer-3 UE-to-UE Relay  p. 167
6.7.1.4Layer-2 link modification for PC5 communication via 5G ProSe Layer-3 UE-to-UE Relay  p. 168
6.7.1.5Layer-2 link maintenance for PC5 communication via 5G ProSe Layer-3 UE-to-UE Relay  p. 168
6.7.25G ProSe Communication via 5G ProSe Layer-2 UE-to-UE Relay  p. 169
6.7.35G ProSe UE-to-UE Relay Communication with integrated Discovery  p. 170
6.7.3.1General  p. 170
6.7.3.2Procedure for Communication via Layer-3 UE-to-UE Relay  p. 171
6.7.3.3Procedure for Communication via Layer-2 UE-to-UE Relay  p. 173
6.7.45G ProSe UE-to-UE Relay reselection  p. 173
6.7.4.1General  p. 173
6.7.4.2Negotiated 5G ProSe Layer-2 UE-to-UE Relay reselection  p. 174
6.7.4.3Negotiated 5G ProSe Layer-3 UE-to-UE Relay reselection  p. 175
6.7.4.4Negotiated 5G ProSe Multi-hop Layer-3 UE-to-UE Relay Reselection for Non-IP type PDU |R19|  p. 177
6.7.55G ProSe Communication via 5G ProSe Layer-3 Multi-hop UE-to-UE Relay |R19|  p. 178
6.7.5.1General  p. 178
6.7.5.2Communication via 5G ProSe Layer-3 Multi-hop UE-to-UE-Relays  p. 178
6.7.5.2.1Layer-2 link establishment via 5G ProSe Layer-3 Multi-hop UE-to-UE-Relays (IP type)  p. 178
6.7.5.2.2Layer-2 link establishment via 5G ProSe Layer-3 Multi-hop UE-to-UE Relays (Non-IP Type)  p. 180
6.8Procedures for communication path switching between PC5 and Uu reference points |R18|  p. 181
6.8.1Procedure for communication path switching from Uu reference point to PC5 reference point  p. 181
6.8.2Procedure for communication path switching from PC5 reference point to Uu reference point  p. 182
6.9Multi-path communication via Uu and via 5G ProSe UE-to-Network Relay |R18|  p. 184
6.9.1General  p. 184
6.9.2Multi-path communication via direct Uu path and via 5G ProSe Layer-3 UE-to-Network Relay  p. 184
6.9.3Multi-path communication via direct Uu path and via 5G ProSe Layer-2 UE-to-Network Relay  p. 184
7Network Function Services  p. 185
7.15G DDNMF Services  p. 185
7.1.1General  p. 185
7.1.2N5g-ddnmf_Discovery service  p. 185
7.1.2.1General  p. 185
7.1.2.2N5g-ddnmf_Discovery_AnnounceAuthorize service operation  p. 185
7.1.2.3N5g-ddnmf_Discovery_AnnounceUpdate service operation  p. 185
7.1.2.4N5g-ddnmf_Discovery_MonitorAuthorize service operation  p. 186
7.1.2.5N5g-ddnmf_Discovery_MonitorUpdate service operation  p. 186
7.1.2.6N5g-ddnmf_Discovery_MonitorUpdateResult service operation  p. 186
7.1.2.7N5g-ddnmf_Discovery_DiscoveryAuthorize service operation  p. 187
7.1.2.8N5g-ddnmf_Discovery_MatchReport service operation  p. 187
7.1.2.9N5g-ddnmf_Discovery_MatchInformation service operation  p. 187
7.2AF Services  p. 187
7.2.1General  p. 187
7.2.2Naf_ProSe service  p. 188
7.2.2.1General  p. 188
7.2.2.2Naf_ProSe_DiscoveryAuthorization service operation  p. 188
7.2.2.3Naf_ProSe_DiscoveryAuthorizationUpdateNotify service operation  p. 188
7.2.2.4Naf_ProSe_DiscoveryAuthorizationResultUpdate service operation  p. 188
$Change history  p. 190