Content for TS 24.554 Word version: 19.1.0
8 5G ProSe UE-to-network relay
8.1 Overview
8.2 Procedures
8a 5G ProSe UE-to-UE relay
8a.1 Overview
8a.2 Procedures
8b 5G ProSe multi-hop UE-to-network relay
8b.1 Overview
8b.2 Procedures
8c 5G ProSe multi-hop UE-to-UE relay
8c.1 Overview
8c.2 Procedures
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8 5G ProSe UE-to-network relay p. 232
8.1 Overview p. 232
8.2 Procedures p. 232
8.2.1 UE-to-network relay discovery over PC5 interface p. 232
8.2.1.1 General p. 232
8.2.1.2 UE-to-network relay discovery over PC5 interface with model A p. 234
8.2.1.2.1 General p. 234
8.2.1.2.2 Announcing UE relay discovery for UE-to-network relay discovery p. 234
8.2.1.2.2.1 General p. 234
8.2.1.2.2.2 Announcing UE procedure for UE-to-network relay discovery initiation p. 234
8.2.1.2.2.3 Announcing UE procedure for UE-to-network relay discovery completion p. 236
8.2.1.2.3 Monitoring UE relay discovery for UE-to-network relay discovery p. 236
8.2.1.2.3.1 General p. 236
8.2.1.2.3.2 Monitoring UE procedure for UE-to-network relay discovery initiation p. 237
8.2.1.2.3.3 Monitoring UE procedure for UE-to-network relay discovery completion p. 239
8.2.1.2.4 Announcing UE procedure for relay discovery additional information p. 239
8.2.1.2.4.1 General p. 239
8.2.1.2.4.2 Announcing procedure for relay discovery additional information p. 239
8.2.1.2.5 Monitoring UE procedure for relay discovery additional information p. 241
8.2.1.3 UE-to-network relay discovery over PC5 interface with model B p. 242
8.2.1.3.1 Discoverer UE procedure for UE-to-network Relay discovery p. 242
8.2.1.3.1.1 General p. 242
8.2.1.3.1.2 Discoverer UE procedure for UE-to-network relay discovery initiation p. 243
8.2.1.3.1.3 Discoverer UE procedure for UE-to-network Relay discovery completion p. 246
8.2.1.3.2 Discoveree UE procedure for UE-to-network Relay discovery p. 246
8.2.1.4 Procedure for UE to use provisioned radio resources for 5G ProSe UE-to-network discovery p. 249
8.2.2 UE-to-network relay selection procedure p. 250
8.2.2.1 General p. 250
8.2.2.2 UE-to-network relay selection procedure initiation p. 250
8.2.2.3 UE-to-network relay selection procedure completion p. 251
8.2.3 UE-to-network relay reselection procedure p. 251
8.2.4 Procedure for UE to use provisioned radio resources for 5G ProSe UE-to-network relay communication p. 252
8.2.5 IP address allocation for 5G ProSe remote UE in 5G ProSe layer-3 UE-to-network relay procedure p. 253
8.2.5a IPv6 prefix delegation via DHCPv6 for 5G ProSe layer-3 UE-to-network relay p. 254
8.2.6 QoS handling for 5G ProSe UE-to-network relay p. 254
8.2.6.1 General p. 254
8.2.6.2 QoS handling for 5G ProSe layer-2 UE-to-network relay p. 254
8.2.6.3 QoS handling for 5G ProSe layer-3 UE-to-network relay without N3IWF p. 254
8.2.6.3.1 General p. 254
8.2.6.3.2 QoS flows handling initiated by the network p. 255
8.2.6.3.3 PC5 QoS flows handling initiated by the 5G ProSe layer-3 remote UE p. 255
8.2.6.4 QoS handling for 5G ProSe layer-3 UE-to-network relay with N3IWF p. 256
8.2.7 5G ProSe layer-3 UE-to-network relay with N3IWF support p. 257
8.2.7.1 General p. 257
8.2.7.2 5G ProSe layer-3 UE-to-network relay UE establishing PDU session to access N3IWF p. 258
8.2.7.3 N3IWF selection for 5G ProSe layer-3 remote UE p. 258
8.2.8 5G ProSe additional parameters announcement procedure p. 258
8.2.8.1 General p. 258
8.2.8.2 5G ProSe additional parameters announcement procedure initiation by the 5G ProSe layer-3 remote UE p. 258
8.2.8.3 5G ProSe additional parameters announcement procedure accepted by the 5G ProSe layer-3 UE-to-network relay UE p. 259
8.2.8.4 5G ProSe additional parameters announcement procedure completion by the 5G ProSe layer-3 remote UE p. 259
8.2.8.5 Abnormal cases p. 259
8.2.9 5G ProSe AA message reliable transport procedure p. 260
8.2.9.1 General p. 260
8.2.9.2 5G ProSe AA message reliable transport procedure initiation p. 260
8.2.9.3 5G ProSe AA message reliable transport procedure accepted by the target UE p. 260
8.2.9.4 5G ProSe AA message reliable transport procedure completion by the initiating UE p. 261
8.2.9.5 Abnormal cases p. 261
8.2.10 5G ProSe security procedures over PC8 interface p. 261
8.2.10.1 General p. 261
8.2.10.1.1 Transport protocol for PC8 messages p. 261
8.2.10.1.2 Handling of UE-initiated procedures p. 261
8.2.10.1.2.1 General p. 261
8.2.10.1.2.2 5G PKMF discovery p. 262
8.2.10.2 Procedures p. 262
8.2.10.2.1 Types of 5G ProSe procedures over PC8 interface p. 262
8.2.10.2.2 5G ProSe UE-to-network relay discovery security parameters request procedure p. 262
8.2.10.2.2.1 General p. 262
8.2.10.2.2.2 5G ProSe UE-to-network relay discovery security parameters request procedure initiation p. 263
8.2.10.2.2.3 5G ProSe UE-to-network relay discovery security parameters request procedure accepted by the 5G PKMF p. 264
8.2.10.2.2.4 5G ProSe UE-to-network relay discovery security parameters request procedure completion by the UE p. 266
8.2.10.2.2.5 5G ProSe UE-to-network relay discovery security parameters request procedure not accepted by the 5G PKMF p. 266
8.2.10.2.2.6 Abnormal cases in the UE p. 266
8.2.10.2.2.7 Abnormal cases in the 5G PKMF p. 267
8.2.10.2.3 5G ProSe remote user key request procedure p. 267
8.2.10.2.3.1 General p. 267
8.2.10.2.3.2 5G ProSe remote user key request procedure initiation p. 267
8.2.10.2.3.3 5G ProSe remote user key request procedure accepted by the 5G PKMF p. 268
8.2.10.2.3.4 5G ProSe remote user key request procedure completion by the UE p. 268
8.2.10.2.3.5 5G ProSe remote user key request procedure not accepted by the 5G PKMF p. 268
8.2.10.2.3.6 Abnormal cases in the UE p. 269
8.2.10.2.3.7 Abnormal cases in the 5G PKMF p. 269
8.2.10.2.4 Key request procedure p. 269
8.2.10.2.4.1 General p. 269
8.2.10.2.4.2 Key request procedure initiation p. 269
8.2.10.2.4.3 Key request procedure accepted by the 5G PKMF p. 270
8.2.10.2.4.4 Key request procedure completion by the UE p. 271
8.2.10.2.4.5 Key request procedure not accepted by the 5G PKMF p. 271
8.2.10.2.4.6 Abnormal cases in the UE p. 271
8.2.10.2.4.7 Abnormal cases in the 5G PKMF p. 271
8.2.11 UE-to-network relay unicast direct communication over PC5 interface p. 271
8.2.12 5G ProSe security procedures over PC3a interface p. 272
8.2.12.1 General p. 272
8.2.12.1.1 Transport protocol for PC3a messages p. 272
8.2.12.1.2 Handling of UE-initiated procedures p. 272
8.2.12.1.2.1 General p. 272
8.2.12.1.2.2 5G DDNMF discovery p. 272
8.2.12.2 Procedures p. 272
8.2.12.2.1 Types of 5G ProSe security procedures over PC3a interface p. 272
8.2.12.2.2 5G ProSe UE-to-network relay discovery security material request procedure p. 273
8.2.12.2.2.1 General p. 273
8.2.12.2.2.2 5G ProSe UE-to-network relay discovery security material request procedure initiation p. 273
8.2.12.2.2.3 5G ProSe UE-to-network relay discovery security material request procedure accepted by the 5G DDNMF p. 274
8.2.12.2.2.4 5G ProSe UE-to-network relay discovery security material request procedure completion by the UE p. 276
8.2.12.2.2.5 5G ProSe UE-to-network relay discovery security material request procedure not accepted by the 5G DDNMF p. 276
8.2.12.2.2.6 Abnormal cases in the UE p. 276
8.2.12.2.2.7 Abnormal cases in the 5G DDNMF p. 277
8.2.13 Communication path switching between 5G ProSe UE-to-network relays p. 277
8.2.13.1 General p. 277
8.2.13.2 Target UE-to-network relay discovery and selection for communication path switching p. 277
8.2.13.3 Path switching to 5G ProSe layer-3 UE-to-network relay without N3IWF p. 278
8.2.13.4 Path switching to 5G ProSe layer-3 UE-to-network relay with N3IWF p. 278
8.2.13.5 Path switching to 5G ProSe layer-2 UE-to-network relay p. 278
8.2.14 5G ProSe public warning notification relay procedure p. 279
8.2.14.1 General p. 279
8.2.14.2 5G ProSe public warning notification relay procedure initiation for 5G ProSe layer-3 UE-to-network relay p. 279
8.2.14.3 Reception of 5G ProSe public warning notification relay message p. 280
8.2.15 Multi-path communication via a PDU session and via 5G ProSe UE-to-network relay p. 280
8a 5G ProSe UE-to-UE relay p. 281
8a.1 Overview p. 281
8a.2 Procedures p. 281
8a.2.1 5G ProSe UE-to-UE relay discovery over PC5 interface p. 281
8a.2.1.1 General p. 281
8a.2.1.2 UE-to-UE relay discovery over PC5 interface with model A p. 282
8a.2.1.2.1 General p. 282
8a.2.1.2.2 Announcing UE relay discovery for UE-to-UE relay discovery p. 282
8a.2.1.2.2.1 General p. 282
8a.2.1.2.2.2 Announcing UE procedure for UE-to-UE relay discovery initiation p. 282
8a.2.1.2.2.3 Announcing UE procedure for UE-to-UE relay discovery completion p. 285
8a.2.1.2.3 Monitoring UE relay discovery for UE-to-UE relay discovery p. 285
8a.2.1.3 UE-to-UE relay discovery over PC5 interface with model B p. 287
8a.2.1.3.1 General p. 287
8a.2.1.3.2 Discoverer end UE procedure for UE-to-UE Relay discovery p. 287
8a.2.1.3.2.1 General p. 287
8a.2.1.3.2.2 Discoverer end UE procedure for UE-to-UE relay discovery initiation p. 287
8a.2.1.3.2.3 Discoverer end UE procedure for UE-to-UE relay discovery completion p. 290
8a.2.1.3.3 Relay UE procedure for UE-to-UE Relay discovery p. 291
8a.2.1.3.3.1 General p. 291
8a.2.1.3.3.2 Relay UE procedure for UE-to-UE relay discovery initiation p. 291
8a.2.1.3.3.3 Relay UE procedure for UE-to-UE relay discovery completion p. 295
8a.2.1.3.4 Discoveree end UE procedure for UE-to-UE Relay discovery p. 295
8a.2.2 5G ProSe UE-to-UE relay selection procedure p. 298
8a.2.2.1 General p. 298
8a.2.2.2 UE-to-UE relay selection procedure initiation p. 298
8a.2.2.3 UE-to-UE relay selection procedure completion p. 298
8a.2.3 5G ProSe UE-to-UE relay reselection procedure p. 298
8a.2.3.1 General p. 298
8a.2.3.2 UE-to-UE relay reselection procedure initiation p. 299
8a.2.3.3 Candidate 5G ProSe UE-to-UE relay discovery procedure p. 299
8a.2.4 5G ProSe UE-to-UE relay unicast direct communication over PC5 interface p. 300
8a.2.5 IP address allocation for 5G ProSe layer-3 end UE in 5G ProSe layer-3 UE-to-UE relay procedure p. 301
8a.2.6 Security procedures for 5G ProSe layer-2 end UEs p. 301
8a.2.7 QoS handling for 5G ProSe UE-to-UE relay p. 301
8a.2.7.1 General p. 301
8a.2.7.2 QoS handling for 5G ProSe layer-3 UE-to-UE relay p. 302
8a.2.7.2.1 General p. 302
8a.2.7.2.2 PC5 QoS flows handling initiated by the source 5G ProSe layer-3 end UE p. 302
8a.2.7.3 QoS handling for 5G ProSe layer-2 UE-to-UE relay p. 302
8a.2.8 Support for Ethernet traffic via 5G ProSe layer-3 UE-to-UE relay p. 303
8a.2.9 5G ProSe AA message reliable transport procedure p. 303
8a.2.10 5G ProSe UE-to-UE relay direct link security establishment procedure p. 304
8a.2.10.1 General p. 304
8a.2.10.2 5G ProSe UE-to-UE relay direct link security establishment procedure initiation by initiating UE p. 304
8a.2.10.3 5G ProSe UE-to-UE relay direct link security establishment procedure accepted by the target UE p. 306
8a.2.10.4 5G ProSe UE-to-UE relay direct link security establishment procedure completion by the initiating UE p. 307
8a.2.10.5 5G ProSe UE-to-UE relay direct link security establishment procedure not accepted by the target UE p. 307
8a.2.10.6 Abnormal cases p. 309
8a.2.11 5G ProSe security procedures over PC3a interface for 5G ProSe UE-to-UE relay p. 309
8a.2.11.1 General p. 309
8a.2.11.1.1 Transport protocol for PC3a messages p. 309
8a.2.11.1.2 Handling of UE-initiated procedures p. 309
8a.2.11.2 Procedures p. 309
8a.2.11.2.1 Types of 5G ProSe security procedures over PC3a interface for 5G ProSe UE-to-UE relay p. 309
8a.2.11.2.2 5G ProSe UE-to-UE relay discovery security material request procedure p. 310
8a.2.11.2.2.1 General p. 310
8a.2.11.2.2.2 5G ProSe UE-to-UE relay discovery security material request procedure initiation p. 310
8a.2.11.2.2.3 5G ProSe UE-to-UE relay discovery security material request procedure accepted by the 5G DDNMF p. 311
8a.2.11.2.2.4 5G ProSe UE-to-UE relay discovery security material request procedure completion by the UE p. 313
8a.2.11.2.2.5 5G ProSe UE-to-UE relay discovery security material request procedure not accepted by the 5G DDNMF p. 313
8a.2.11.2.2.6 Abnormal cases in the UE p. 313
8a.2.11.2.2.7 Abnormal cases in the 5G DDNMF p. 314
8a.2.12 5G ProSe security procedures over PC8 interface for 5G ProSe UE-to-UE relay p. 314
8a.2.12.1 General p. 314
8a.2.12.1.1 Transport protocol for PC8 messages p. 314
8a.2.12.1.2 Handling of UE-initiated procedures p. 314
8a.2.12.2 Procedures p. 314
8a.2.12.2.1 Types of 5G ProSe security procedures over PC8 interface for 5G ProSe UE-to-UE relay p. 314
8a.2.12.2.2 5G ProSe UE-to-UE relay discovery security material request procedure p. 315
8a.2.12.2.2.1 General p. 315
8a.2.12.2.2.2 5G ProSe UE-to-UE relay discovery security material request procedure initiation p. 315
8a.2.12.2.2.3 5G ProSe UE-to-UE relay discovery security material request procedure accepted by the 5G PKMF p. 316
8a.2.12.2.2.4 5G ProSe UE-to-UE relay discovery security material request procedure completion by the UE p. 318
8a.2.12.2.2.5 5G ProSe UE-to-UE relay discovery security material request procedure not accepted by the 5G PKMF p. 318
8a.2.12.2.2.6 Abnormal cases in the UE p. 318
8a.2.12.2.2.7 Abnormal cases in the 5G PKMF p. 319
8a.2.12.2.3 5G ProSe end UE key request procedure p. 319
8a.2.12.2.4 5G ProSe UE-to-UE relay UE key request procedure p. 319
8a.2.13 5G ProSe direct discovery set transfer procedure p. 319
8a.2.13.1 General p. 319
8a.2.13.2 5G ProSe direct discovery set transfer procedure initiation by initiating UE p. 319
8a.2.13.3 5G ProSe direct discovery set procedure ack by the target UE p. 320
8a.2.13.4 5G ProSe direct discovery set transfer procedure completion by the initiating UE p. 320
8a.2.13.5 Abnormal cases p. 320
8b 5G ProSe multi-hop UE-to-network relay p. 321
8b.1 Overview p. 321
8b.2 Procedures p. 321
8b.2.1 5G ProSe multi-hop UE-to-network relay discovery over PC5 interface p. 321
8b.2.1.1 General p. 321
8b.2.1.2 Multi-hop UE-to-network relay discovery over PC5 interface with model A p. 323
8b.2.1.2.1 General p. 323
8b.2.1.2.2 Announcing multi-hop UE-to-network relay discovery p. 323
8b.2.1.2.2.1 General p. 323
8b.2.1.2.2.2 ProSe multi-hop UE-to-network relay UE procedure for multi-hop UE-to-network relay discovery initiation p. 323
8b.2.1.2.2.3 ProSe intermediate UE-to-network relay UE procedure for multi-hop UE-to-network relay discovery initiation p. 325
8b.2.1.2.2.4 Announcing UE procedure for multi-hop UE-to-network relay discovery completion p. 327
8b.2.1.2.3 Monitoring multi-hop UE-to-network relay discovery p. 328
8b.2.1.2.3.1 General p. 328
8b.2.1.2.3.2 ProSe intermediate UE-to-network relay UE procedure for multi-hop UE-to-network relay discovery monitoring p. 328
8b.2.1.2.3.3 ProSe multi-hop remote UE procedure for multi-hop UE-to-network relay discovery monitoring p. 330
8b.2.1.2.3.4 Monitoring UE procedure for multi-hop UE-to-network relay discovery completion p. 332
8b.2.1.2.4 Announcing multi-hop UE-to-network relay discovery additional information p. 332
8b.2.1.2.4.1 General p. 332
8b.2.1.2.4.2 ProSe multi-hop UE-to-network relay UE procedure p. 332
8b.2.1.2.4.3 ProSe multi-hop intermediate UE-to-network relay UE procedure p. 334
8b.2.1.2.5 Monitoring multi-hop UE-to-network relay discovery additional information p. 336
8b.2.1.3 Multi-hop UE-to-network relay discovery over PC5 interface with model B p. 337
8b.2.1.3.1 General p. 337
8b.2.1.3.2 Discoverer UE procedure for multi-hop UE-to-network relay discovery p. 338
8b.2.1.3.2.1 General p. 338
8b.2.1.3.2.2 Discoverer remote UE procedure for multi-hop UE-to-network relay discovery initiation p. 338
8b.2.1.3.2.3 Discoverer intermediate UE procedure for multi-hop UE-to-network relay discovery initiation p. 341
8b.2.1.3.2.4 Discoverer UE procedure for multi-hop UE-to-network relay discovery completion p. 345
8b.2.1.3.3 Discoveree UE procedure for multi-hop UE-to-network relay discovery p. 345
8b.2.1.3.3.1 General p. 345
8b.2.1.3.3.2 Discoveree UE-to-network relay UE procedure for multi-hop UE-to-network relay discovery initiation p. 345
8b.2.1.3.3.3 Discoveree intermediate UE procedure for multi-hop UE-to-network relay discovery initiation p. 348
8b.2.1.3.3.4 Discoveree UE procedure for multi-hop UE-to-network relay discovery completion p. 350
8b.2.2 5G ProSe multi-hop UE-to-network relay unicast direct communication over PC5 interface p. 351
8b.2.2.1 Overview p. 351
8b.2.2.2 5G ProSe direct link establishment procedure for multi-hop UE-to-network relay p. 351
8b.2.2.2.1 General p. 351
8b.2.2.2.2 5G ProSe direct link establishment procedure for multi-hop UE-to-network relay based on model A discovery p. 351
8b.2.2.2.3 5G ProSe direct link establishment procedure for multi-hop UE-to-network relay based on model B discovery p. 352
8b.2.2.3 5G ProSe direct link modification procedure for multi-hop UE-to-network relay p. 352
8b.2.3 Multi-hop UE-to-network relay reselection procedure p. 354
8b.2.4 Procedure for UE to use provisioned radio resources for 5G ProSe multi-hop UE-to-network discovery p. 354
8b.2.5 multi-hop UE-to-network relay selection procedure p. 355
8b.2.5.1 General p. 355
8b.2.6 QoS handling for 5G ProSe multi-hop UE-to-network relay p. 355
8b.2.6.1 General p. 355
8b.2.6.2 QoS handling for 5G ProSe multi-hop layer-3 UE-to-network relay without N3IWF p. 355
8b.2.7 IP address allocation in 5G ProSe multi-hop layer-3 UE-to-network relay procedure p. 357
8c 5G ProSe multi-hop UE-to-UE relay p. 357
8c.1 Overview p. 357
8c.2 Procedures p. 358
8c.2.1 5G ProSe multi-hop layer-3 UE-to-UE relay discovery over PC5 interface p. 358
8c.2.1.1 General p. 358
8c.2.1.2 5G ProSe multi-hop layer-3 UE-to-UE relay discovery over PC5 interface for IP data unit type p. 358
8c.2.1.2.1 General p. 358
8c.2.1.2.2 Multi-hop layer-3 UE-to-UE relay discovery over PC5 interface with model A p. 359
8c.2.1.2.2.1 General p. 359
8c.2.1.2.2.2 Announcing UE relay discovery for multi-hop layer-3 UE-to-UE relay discovery p. 359
8c.2.1.2.2.3 Monitoring UE relay discovery for multi-hop layer-3 UE-to-UE relay discovery for IP data unit type p. 361
8c.2.1.2.3 5G ProSe multi-hop layer-3 UE-to-UE relay discovery for IP data unit type with model B p. 363
8c.2.1.2.3.1 General p. 363
8c.2.1.2.3.2 Discoverer end UE procedure for 5G ProSe multi-hop layer-3 UE-to-UE relay discovery p. 363
8c.2.1.2.3.3 Discoverer relay UE procedure for 5G ProSe multi-hop layer-3 UE-to-UE relay discovery p. 365
8c.2.1.2.3.4 Discoveree relay UE procedure for 5G ProSe multi-hop layer-3 UE-to-UE relay discovery p. 365
8c.2.1.3 5G ProSe multi-hop layer-3 UE-to-UE relay discovery for Ethernet and unstructured data unit typeEE p. 367
8c.2.1.3.1 General p. 367
8c.2.1.3.2 5G ProSe multi-hop layer-3 UE-to-UE relay discovery for Ethernet and unstructured data unit type with model A p. 368
8c.2.1.3.2.1 General p. 368
8c.2.1.3.2.2 Announcing UE procedure for 5G ProSe multi-hop layer-3 UE-to-UE relay discovery p. 368
8c.2.1.3.2.3 Monitoring UE procedure for 5G ProSe multi-hop layer-3 UE-to-UE relay discovery p. 368
8c.2.1.3.3 5G ProSe multi-hop layer-3 UE-to-UE relay discovery for Ethernet and unstructured data unit type with model B p. 369
8c.2.1.3.3.1 General p. 369
8c.2.1.3.3.2 Discoverer end UE procedure for 5G ProSe multi-hop layer-3 UE-to-UE relay discovery p. 369
8c.2.1.3.3.3 Discoverer relay UE procedure for 5G ProSe multi-hop layer-3 UE-to-UE relay discovery p. 370
8c.2.1.3.3.4 Discoveree end UE procedure for 5G ProSe multi-hop layer-3 UE-to-UE relay discovery p. 371
8c.2.2 5G ProSe multi-hop UE-to-UE relay unicast direct communication over PC5 interface p. 373
8c.2.2.1 General p. 373
8c.2.2.2 5G ProSe direct link management procedure for IP based 5G ProSe multi-hop layer-3 UE-to-UE relay p. 373
8c.2.3 DNS-based discovery of target 5G ProSe end UE in 5G ProSe multi-hop layer-3 UE-to-UE relay procedure for IP communication p. 374
8c.2.4 IP address allocation for 5G ProSe multi-hop layer-3 end UE in 5G ProSe multi-hop layer-3 UE-to-UE relay procedure p. 375
