3GPP LTE官方协议

【实例简介】3GPP LTE官方协议

3GPP 23.501 r17原版，关于

System architecture for the 5G System (5GS)

【实例截图】

【核心代码】

Contents

Foreword  PAGEREF _Toc68015301 \h 18

1 Scope  PAGEREF _Toc68015302 \h 19

2 References  PAGEREF _Toc68015303 \h 19

3 Definitions and abbreviations  PAGEREF _Toc68015304 \h 24

3.1 Definitions  PAGEREF _Toc68015305 \h 24

3.2 Abbreviations  PAGEREF _Toc68015306 \h 29

4 Architecture model and concepts  PAGEREF _Toc68015307 \h 31

4.1 General concepts  PAGEREF _Toc68015308 \h 31

4.2 Architecture reference model  PAGEREF _Toc68015309 \h 32

4.2.1 General  PAGEREF _Toc68015310 \h 32

4.2.2 Network Functions and entities  PAGEREF _Toc68015311 \h 32

4.2.3 Non-roaming reference architecture  PAGEREF _Toc68015312 \h 33

4.2.4 Roaming reference architectures  PAGEREF _Toc68015313 \h 37

4.2.5 Data Storage architectures  PAGEREF _Toc68015314 \h 41

4.2.5a Radio Capabilities Signalling optimisation  PAGEREF _Toc68015315 \h 42

4.2.6 Service-based interfaces  PAGEREF _Toc68015316 \h 43

4.2.7 Reference points  PAGEREF _Toc68015317 \h 44

4.2.8 Support of non-3GPP access  PAGEREF _Toc68015318 \h 46

4.2.8.0 General  PAGEREF _Toc68015319 \h 46

4.2.8.1 General Concepts to Support Trusted and Untrusted Non-3GPP Access  PAGEREF _Toc68015320 \h 46

4.2.8.1A General Concepts to support Wireline Access  PAGEREF _Toc68015321 \h 47

4.2.8.2 Architecture Reference Model for Trusted and Untrusted Non-3GPP Accesses  PAGEREF _Toc68015322 \h 48

4.2.8.2.1 Non-roaming Architecture  PAGEREF _Toc68015323 \h 48

4.2.8.2.2 LBO Roaming Architecture  PAGEREF _Toc68015324 \h 49

4.2.8.2.3 Home-routed Roaming Architecture  PAGEREF _Toc68015325 \h 51

4.2.8.3 Reference Points for Non-3GPP Access  PAGEREF _Toc68015326 \h 53

4.2.8.3.1 Overview  PAGEREF _Toc68015327 \h 53

4.2.8.3.2 Requirements on Ta  PAGEREF _Toc68015328 \h 54

4.2.8.4 Architecture Reference Model for Wireline Access network  PAGEREF _Toc68015329 \h 54

4.2.8.5 Access to 5GC from devices that do not support 5GC NAS over WLAN access  PAGEREF _Toc68015330 \h 55

4.2.8.5.1 General  PAGEREF _Toc68015331 \h 55

4.2.8.5.2 Reference Architecture  PAGEREF _Toc68015332 \h 56

4.2.8.5.3 Network Functions  PAGEREF _Toc68015333 \h 56

4.2.8.5.4 Reference Points  PAGEREF _Toc68015334 \h 56

4.2.9 Network Analytics architecture  PAGEREF _Toc68015335 \h 57

4.2.10 Architecture Reference Model for ATSSS Support  PAGEREF _Toc68015336 \h 57

4.3 Interworking with EPC  PAGEREF _Toc68015337 \h 58

4.3.1 Non-roaming architecture  PAGEREF _Toc68015338 \h 58

4.3.2 Roaming architecture  PAGEREF _Toc68015339 \h 59

4.3.3 Interworking between 5GC via non-3GPP access and E-UTRAN connected to EPC  PAGEREF _Toc68015340 \h 61

4.3.3.1 Non-roaming architecture  PAGEREF _Toc68015341 \h 61

4.3.3.2 Roaming architecture  PAGEREF _Toc68015342 \h 62

4.3.4 Interworking between ePDG connected to EPC and 5GS  PAGEREF _Toc68015343 \h 64

4.3.4.1 Non-roaming architecture  PAGEREF _Toc68015344 \h 64

4.3.4.2 Roaming architectures  PAGEREF _Toc68015345 \h 65

4.3.5 Service Exposure in Interworking Scenarios  PAGEREF _Toc68015346 \h 67

4.3.5.1 Non-roaming architecture  PAGEREF _Toc68015347 \h 67

4.3.5.2 Roaming architectures  PAGEREF _Toc68015348 \h 68

4.4 Specific services  PAGEREF _Toc68015349 \h 69

4.4.1 Public Warning System  PAGEREF _Toc68015350 \h 69

4.4.2 SMS over NAS  PAGEREF _Toc68015351 \h 69

4.4.2.1 Architecture to support SMS over NAS  PAGEREF _Toc68015352 \h 69

4.4.2.2 Reference point to support SMS over NAS  PAGEREF _Toc68015353 \h 71

4.4.2.3 Service based interface to support SMS over NAS  PAGEREF _Toc68015354 \h 71

4.4.3 IMS support  PAGEREF _Toc68015355 \h 71

4.4.4 Location services  PAGEREF _Toc68015356 \h 71

4.4.4.1 Architecture to support Location Services  PAGEREF _Toc68015357 \h 71

4.4.4.2 Reference point to support Location Services  PAGEREF _Toc68015358 \h 71

4.4.4.3 Service Based Interfaces to support Location Services  PAGEREF _Toc68015359 \h 71

4.4.5 Application Triggering Services  PAGEREF _Toc68015360 \h 72

4.4.6 5G LAN-type Services  PAGEREF _Toc68015361 \h 72

4.4.6.1 User plane architecture to support 5G LAN-type service  PAGEREF _Toc68015362 \h 72

4.4.6.2 Reference points to support 5G LAN-type service  PAGEREF _Toc68015363 \h 72

4.4.7 MSISDN-less MO SMS Service  PAGEREF _Toc68015364 \h 72

4.4.8 Architecture to enable Time Sensitive Communication and Time Synchronization  PAGEREF _Toc68015365 \h 73

4.4.8.1 General  PAGEREF _Toc68015366 \h 73

4.4.8.2 Architecture to support IEEE Time Sensitive Networking  PAGEREF _Toc68015367 \h 73

4.4.8.3 Architecture for AF requested support of Time Sensitive Communication and/or Time Synchronization  PAGEREF _Toc68015368 \h 74

5 High level features  PAGEREF _Toc68015369 \h 74

5.1 General  PAGEREF _Toc68015370 \h 74

5.2 Network Access Control  PAGEREF _Toc68015371 \h 74

5.2.1 General  PAGEREF _Toc68015372 \h 74

5.2.2 Network selection  PAGEREF _Toc68015373 \h 75

5.2.2a Network selection for NR satellite access  PAGEREF _Toc68015374 \h 75

5.2.3 Identification and authentication  PAGEREF _Toc68015375 \h 75

5.2.4 Authorisation  PAGEREF _Toc68015376 \h 75

5.2.5 Access control and barring  PAGEREF _Toc68015377 \h 75

5.2.6 Policy control  PAGEREF _Toc68015378 \h 76

5.2.7 Lawful Interception  PAGEREF _Toc68015379 \h 76

5.3 Registration and Connection Management  PAGEREF _Toc68015380 \h 76

5.3.1 General  PAGEREF _Toc68015381 \h 76

5.3.2 Registration Management  PAGEREF _Toc68015382 \h 76

5.3.2.1 General  PAGEREF _Toc68015383 \h 76

5.3.2.2 5GS Registration Management states  PAGEREF _Toc68015384 \h 77

5.3.2.2.1 General  PAGEREF _Toc68015385 \h 77

5.3.2.2.2 RM-DEREGISTERED state  PAGEREF _Toc68015386 \h 77

5.3.2.2.3 RM-REGISTERED state  PAGEREF _Toc68015387 \h 77

5.3.2.2.4 5GS Registration Management State models  PAGEREF _Toc68015388 \h 78

5.3.2.3 Registration Area management  PAGEREF _Toc68015389 \h 78

5.3.2.4 Support of a UE registered over both 3GPP and Non-3GPP access  PAGEREF _Toc68015390 \h 79

5.3.3 Connection Management  PAGEREF _Toc68015391 \h 81

5.3.3.1 General  PAGEREF _Toc68015392 \h 81

5.3.3.2 5GS Connection Management states  PAGEREF _Toc68015393 \h 81

5.3.3.2.1 General  PAGEREF _Toc68015394 \h 81

5.3.3.2.2 CM-IDLE state  PAGEREF _Toc68015395 \h 81

5.3.3.2.3 CM-CONNECTED state  PAGEREF _Toc68015396 \h 82

5.3.3.2.4 5GS Connection Management State models  PAGEREF _Toc68015397 \h 83

5.3.3.2.5 CM-CONNECTED with RRC Inactive state  PAGEREF _Toc68015398 \h 83

5.3.3.3 NAS signalling connection management  PAGEREF _Toc68015399 \h 85

5.3.3.3.1 General  PAGEREF _Toc68015400 \h 85

5.3.3.3.2 NAS signalling connection establishment  PAGEREF _Toc68015401 \h 85

5.3.3.3.3 NAS signalling connection Release  PAGEREF _Toc68015402 \h 85

5.3.3.4 Support of a UE connected over both 3GPP and Non-3GPP access  PAGEREF _Toc68015403 \h 86

5.3.4 UE Mobility  PAGEREF _Toc68015404 \h 86

5.3.4.1 Mobility Restrictions  PAGEREF _Toc68015405 \h 86

5.3.4.1.1 General  PAGEREF _Toc68015406 \h 86

5.3.4.1.2 Management of Service Area Restrictions  PAGEREF _Toc68015407 \h 88

5.3.4.2 Mobility Pattern  PAGEREF _Toc68015408 \h 89

5.3.4.3 Radio Resource Management functions  PAGEREF _Toc68015409 \h 90

5.3.4.4 UE mobility event notification  PAGEREF _Toc68015410 \h 90

5.3.5 Triggers for network analytics  PAGEREF _Toc68015411 \h 91

5.4 3GPP access specific aspects  PAGEREF _Toc68015412 \h 92

5.4.1 UE reachability in CM-IDLE  PAGEREF _Toc68015413 \h 92

5.4.1.1 General  PAGEREF _Toc68015414 \h 92

5.4.1.2 UE reachability allowing mobile terminated data while the UE is CM-IDLE  PAGEREF _Toc68015415 \h 93

5.4.1.3 Mobile Initiated Connection Only (MICO) mode  PAGEREF _Toc68015416 \h 93

5.4.2 UE reachability in CM-CONNECTED  PAGEREF _Toc68015417 \h 94

5.4.3 Paging strategy handling  PAGEREF _Toc68015418 \h 94

5.4.3.1 General  PAGEREF _Toc68015419 \h 94

5.4.3.2 Paging Policy Differentiation  PAGEREF _Toc68015420 \h 94

5.4.3.3 Paging Priority  PAGEREF _Toc68015421 \h 95

5.4.4 UE Radio Capability handling  PAGEREF _Toc68015422 \h 95

5.4.4.1 UE radio capability information storage in the AMF  PAGEREF _Toc68015423 \h 95

5.4.4.1a UE radio capability signalling optimisation (RACS)  PAGEREF _Toc68015424 \h 96

5.4.4.2 Void  PAGEREF _Toc68015425 \h 100

5.4.4.2a UE Radio Capability Match Request  PAGEREF _Toc68015426 \h 100

5.4.4.3 Paging assistance information  PAGEREF _Toc68015427 \h 100

5.4.4a UE MM Core Network Capability handling  PAGEREF _Toc68015428 \h 101

5.4.4b UE 5GSM Core Network Capability handling  PAGEREF _Toc68015429 \h 101

5.4.5 DRX (Discontinuous Reception) framework  PAGEREF _Toc68015430 \h 102

5.4.6 Core Network assistance information for RAN optimization  PAGEREF _Toc68015431 \h 102

5.4.6.1 General  PAGEREF _Toc68015432 \h 102

5.4.6.2 Core Network assisted RAN parameters tuning  PAGEREF _Toc68015433 \h 102

5.4.6.3 Core Network assisted RAN paging information  PAGEREF _Toc68015434 \h 103

5.4.7 NG-RAN location reporting  PAGEREF _Toc68015435 \h 104

5.4.8 Support for identification and restriction of using unlicensed spectrum  PAGEREF _Toc68015436 \h 104

5.4.9 Wake Up Signal Assistance  PAGEREF _Toc68015437 \h 105

5.4.9.1 General  PAGEREF _Toc68015438 \h 105

5.4.9.2 Group Wake Up Signal  PAGEREF _Toc68015439 \h 105

5.4.10 Support for identification and restriction of using NR satellite access  PAGEREF _Toc68015440 \h 106

5.5 Non-3GPP access specific aspects  PAGEREF _Toc68015441 \h 106

5.5.0 General  PAGEREF _Toc68015442 \h 106

5.5.1 Registration Management  PAGEREF _Toc68015443 \h 106

5.5.2 Connection Management  PAGEREF _Toc68015444 \h 107

5.5.3 UE Reachability  PAGEREF _Toc68015445 \h 108

5.5.3.1 UE reachability in CM-IDLE  PAGEREF _Toc68015446 \h 108

5.5.3.2 UE reachability in CM-CONNECTED  PAGEREF _Toc68015447 \h 108

5.6 Session Management  PAGEREF _Toc68015448 \h 109

5.6.1 Overview  PAGEREF _Toc68015449 \h 109

5.6.2 Interaction between AMF and SMF  PAGEREF _Toc68015450 \h 112

5.6.3 Roaming  PAGEREF _Toc68015451 \h 114

5.6.4 Single PDU Session with multiple PDU Session Anchors  PAGEREF _Toc68015452 \h 114

5.6.4.1 General  PAGEREF _Toc68015453 \h 114

5.6.4.2 Usage of an UL Classifier for a PDU Session  PAGEREF _Toc68015454 \h 115

5.6.4.3 Usage of IPv6 multi-homing for a PDU Session  PAGEREF _Toc68015455 \h 116

5.6.5 Support for Local Area Data Network  PAGEREF _Toc68015456 \h 118

5.6.6 Secondary authentication/authorization by a DN-AAA server during the establishment of a PDU Session  PAGEREF _Toc68015457 \h 120

5.6.7 Application Function influence on traffic routing  PAGEREF _Toc68015458 \h 122

5.6.7.1 General  PAGEREF _Toc68015459 \h 122

5.6.7.2 Enhancement of UP path management based on the coordination with AFs  PAGEREF _Toc68015460 \h 127

5.6.8 Selective activation and deactivation of UP connection of existing PDU Session  PAGEREF _Toc68015461 \h 128

5.6.9 Session and Service Continuity  PAGEREF _Toc68015462 \h 129

5.6.9.1 General  PAGEREF _Toc68015463 \h 129

5.6.9.2 SSC mode  PAGEREF _Toc68015464 \h 130

5.6.9.2.1 SSC Mode 1  PAGEREF _Toc68015465 \h 130

5.6.9.2.2 SSC Mode 2  PAGEREF _Toc68015466 \h 130

5.6.9.2.3 SSC Mode 3  PAGEREF _Toc68015467 \h 130

5.6.9.3 SSC mode selection  PAGEREF _Toc68015468 \h 131

5.6.10 Specific aspects of different PDU Session types  PAGEREF _Toc68015469 \h 131

5.6.10.1 Support of IP PDU Session type  PAGEREF _Toc68015470 \h 131

5.6.10.2 Support of Ethernet PDU Session type  PAGEREF _Toc68015471 \h 132

5.6.10.3 Support of Unstructured PDU Session type  PAGEREF _Toc68015472 \h 134

5.6.10.4 Maximum Transfer Unit size considerations  PAGEREF _Toc68015473 \h 134

5.6.11 UE presence in Area of Interest reporting usage by SMF  PAGEREF _Toc68015474 \h 135

5.6.12 Use of Network Instance  PAGEREF _Toc68015475 \h 136

5.6.13 Always-on PDU session  PAGEREF _Toc68015476 \h 137

5.6.14 Support of Framed Routing  PAGEREF _Toc68015477 \h 137

5.6.15 Triggers for network analytics  PAGEREF _Toc68015478 \h 138

5.7 QoS model  PAGEREF _Toc68015479 \h 138

5.7.1 General Overview  PAGEREF _Toc68015480 \h 138

5.7.1.1 QoS Flow  PAGEREF _Toc68015481 \h 138

5.7.1.2 QoS Profile  PAGEREF _Toc68015482 \h 139

5.7.1.2a Alternative QoS Profile  PAGEREF _Toc68015483 \h 139

5.7.1.3 Control of QoS Flows  PAGEREF _Toc68015484 \h 139

5.7.1.4 QoS Rules  PAGEREF _Toc68015485 \h 140

5.7.1.5 QoS Flow mapping  PAGEREF _Toc68015486 \h 140

5.7.1.6 DL traffic  PAGEREF _Toc68015487 \h 142

5.7.1.7 UL Traffic  PAGEREF _Toc68015488 \h 143

5.7.1.8 AMBR/MFBR enforcement and rate limitation  PAGEREF _Toc68015489 \h 143

5.7.1.9 Precedence Value  PAGEREF _Toc68015490 \h 144

5.7.2 5G QoS Parameters  PAGEREF _Toc68015491 \h 144

5.7.2.1 5QI  PAGEREF _Toc68015492 \h 144

5.7.2.2 ARP  PAGEREF _Toc68015493 \h 144

5.7.2.3 RQA  PAGEREF _Toc68015494 \h 145

5.7.2.4 Notification control  PAGEREF _Toc68015495 \h 145

5.7.2.4.1 General  PAGEREF _Toc68015496 \h 145

5.7.2.4.1a Notification Control without Alternative QoS Profiles  PAGEREF _Toc68015497 \h 145

5.7.2.4.1b Notification control with Alternative QoS Profiles  PAGEREF _Toc68015498 \h 146

5.7.2.4.2 Usage of Notification control with Alternative QoS Profiles at handover  PAGEREF _Toc68015499 \h 146

5.7.2.4.3 Usage of Notification control with Alternative QoS Profiles during QoS Flow establishment and modification  PAGEREF _Toc68015500 \h 147

5.7.2.5 Flow Bit Rates  PAGEREF _Toc68015501 \h 147

5.7.2.6 Aggregate Bit Rates  PAGEREF _Toc68015502 \h 148

5.7.2.7 Default values  PAGEREF _Toc68015503 \h 148

5.7.2.8 Maximum Packet Loss Rate  PAGEREF _Toc68015504 \h 149

5.7.2.9 Wireline access network specific 5G QoS parameters  PAGEREF _Toc68015505 \h 149

5.7.3 5G QoS characteristics  PAGEREF _Toc68015506 \h 149

5.7.3.1 General  PAGEREF _Toc68015507 \h 149

5.7.3.2 Resource Type  PAGEREF _Toc68015508 \h 149

5.7.3.3 Priority Level  PAGEREF _Toc68015509 \h 150

5.7.3.4 Packet Delay Budget  PAGEREF _Toc68015510 \h 150

5.7.3.5 Packet Error Rate  PAGEREF _Toc68015511 \h 151

5.7.3.6 Averaging Window  PAGEREF _Toc68015512 \h 151

5.7.3.7 Maximum Data Burst Volume  PAGEREF _Toc68015513 \h 151

5.7.4 Standardized 5QI to QoS characteristics mapping  PAGEREF _Toc68015514 \h 152

5.7.5 Reflective QoS  PAGEREF _Toc68015515 \h 156

5.7.5.1 General  PAGEREF _Toc68015516 \h 156

5.7.5.2 UE Derived QoS Rule  PAGEREF _Toc68015517 \h 157

5.7.5.3 Reflective QoS Control  PAGEREF _Toc68015518 \h 158

5.7.6 Packet Filter Set  PAGEREF _Toc68015519 \h 159

5.7.6.1 General  PAGEREF _Toc68015520 \h 159

5.7.6.2 IP Packet Filter Set  PAGEREF _Toc68015521 \h 159

5.7.6.3 Ethernet Packet Filter Set  PAGEREF _Toc68015522 \h 159

5.8 User Plane Management  PAGEREF _Toc68015523 \h 160

5.8.1 General  PAGEREF _Toc68015524 \h 160

5.8.2 Functional Description  PAGEREF _Toc68015525 \h 160

5.8.2.1 General  PAGEREF _Toc68015526 \h 160

5.8.2.2 UE IP Address Management  PAGEREF _Toc68015527 \h 160

5.8.2.2.1 General  PAGEREF _Toc68015528 \h 160

5.8.2.2.2 Routing rules configuration  PAGEREF _Toc68015529 \h 163

5.8.2.2.3 The procedure of Stateless IPv6 Address Autoconfiguration  PAGEREF _Toc68015530 \h 163

5.8.2.3 Management of CN Tunnel Info  PAGEREF _Toc68015531 \h 164

5.8.2.3.1 General  PAGEREF _Toc68015532 \h 164

5.8.2.3.2 Void  PAGEREF _Toc68015533 \h 164

5.8.2.3.3 Management of CN Tunnel Info in the UPF  PAGEREF _Toc68015534 \h 164

5.8.2.4 Traffic Detection  PAGEREF _Toc68015535 \h 164

5.8.2.4.1 General  PAGEREF _Toc68015536 \h 164

5.8.2.4.2 Traffic Detection Information  PAGEREF _Toc68015537 \h 164

5.8.2.5 Control of User Plane Forwarding  PAGEREF _Toc68015538 \h 165

5.8.2.5.1 General  PAGEREF _Toc68015539 \h 165

5.8.2.5.2 Data forwarding between the SMF and UPF  PAGEREF _Toc68015540 \h 165

5.8.2.5.3 Support of Ethernet PDU Session type  PAGEREF _Toc68015541 \h 165

5.8.2.6 Charging and Usage Monitoring Handling  PAGEREF _Toc68015542 \h 167

5.8.2.6.1 General  PAGEREF _Toc68015543 \h 167

5.8.2.6.2 Activation of Usage Reporting in UPF  PAGEREF _Toc68015544 \h 167

5.8.2.6.3 Reporting of Usage Information towards SMF  PAGEREF _Toc68015545 \h 167

5.8.2.7 PDU Session and QoS Flow Policing  PAGEREF _Toc68015546 \h 168

5.8.2.8 PCC Related Functions  PAGEREF _Toc68015547 \h 168

5.8.2.8.1 Activation/Deactivation of predefined PCC rules  PAGEREF _Toc68015548 \h 168

5.8.2.8.2 Enforcement of Dynamic PCC Rules  PAGEREF _Toc68015549 \h 169

5.8.2.8.3 Redirection  PAGEREF _Toc68015550 \h 169

5.8.2.8.4 Support of PFD Management  PAGEREF _Toc68015551 \h 169

5.8.2.9 Functionality of Sending of "End marker"  PAGEREF _Toc68015552 \h 170

5.8.2.9.0 Introduction  PAGEREF _Toc68015553 \h 170

5.8.2.9.1 UPF Constructing the "End marker" Packets  PAGEREF _Toc68015554 \h 170

5.8.2.9.2 SMF Constructing the "End marker" Packets  PAGEREF _Toc68015555 \h 170

5.8.2.10 UP Tunnel Management  PAGEREF _Toc68015556 \h 171

5.8.2.11 Parameters for N4 session management  PAGEREF _Toc68015557 \h 171

5.8.2.11.1 General  PAGEREF _Toc68015558 \h 171

5.8.2.11.2 N4 Session Context  PAGEREF _Toc68015559 \h 172

5.8.2.11.3 Packet Detection Rule  PAGEREF _Toc68015560 \h 172

5.8.2.11.4 QoS Enforcement Rule  PAGEREF _Toc68015561 \h 175

5.8.2.11.5 Usage Reporting Rule  PAGEREF _Toc68015562 \h 178

5.8.2.11.6 Forwarding Action Rule  PAGEREF _Toc68015563 \h 181

5.8.2.11.7 Usage Report generated by UPF  PAGEREF _Toc68015564 \h 184

5.8.2.11.8 Multi-Access Rule  PAGEREF _Toc68015565 \h 185

5.8.2.11.9 Bridge Information  PAGEREF _Toc68015566 \h 186

5.8.2.11.10 Void  PAGEREF _Toc68015567 \h 186

5.8.2.11.11 Session Reporting Rule  PAGEREF _Toc68015568 \h 186

5.8.2.11.12 Session reporting generated by UPF  PAGEREF _Toc68015569 \h 187

5.8.2.11.13 Void  PAGEREF _Toc68015570 \h 187

5.8.2.11.14 TSC Management Information  PAGEREF _Toc68015571 \h 187

5.8.2.11.15 Downlink Data Report generated by UPF  PAGEREF _Toc68015572 \h 187

5.8.2.12 Reporting of the UE MAC addresses used in a PDU Session  PAGEREF _Toc68015573 \h 188

5.8.2.13 Support for 5G VN group communication  PAGEREF _Toc68015574 \h 188

5.8.2.13.0 General  PAGEREF _Toc68015575 \h 188

5.8.2.13.1 Support for unicast traffic forwarding of a 5G VN  PAGEREF _Toc68015576 \h 189

5.8.2.13.2 Support for unicast traffic forwarding update due to UE mobility  PAGEREF _Toc68015577 \h 190

5.8.2.13.3 Support for user plane traffic replication in a 5G VN  PAGEREF _Toc68015578 \h 191

5.8.2.14 Inter PLMN User Plane Security functionality  PAGEREF _Toc68015579 \h 193

5.8.2.15 Reporting of satellite backhaul to SMF  PAGEREF _Toc68015580 \h 193

5.8.3 Explicit Buffer Management  PAGEREF _Toc68015581 \h 193

5.8.3.1 General  PAGEREF _Toc68015582 \h 193

5.8.3.2 Buffering at UPF  PAGEREF _Toc68015583 \h 193

5.8.3.3 Buffering at SMF  PAGEREF _Toc68015584 \h 194

5.8.4 SMF Pause of Charging  PAGEREF _Toc68015585 \h 194

5.9 Identifiers  PAGEREF _Toc68015586 \h 194

5.9.1 General  PAGEREF _Toc68015587 \h 194

5.9.2 Subscription Permanent Identifier  PAGEREF _Toc68015588 \h 194

5.9.2a Subscription Concealed Identifier  PAGEREF _Toc68015589 \h 195

5.9.3 Permanent Equipment Identifier  PAGEREF _Toc68015590 \h 195

5.9.4 5G Globally Unique Temporary Identifier  PAGEREF _Toc68015591 \h 195

5.9.5 AMF Name  PAGEREF _Toc68015592 \h 196

5.9.6 Data Network Name (DNN)  PAGEREF _Toc68015593 \h 196

5.9.7 Internal-Group Identifier  PAGEREF _Toc68015594 \h 197

5.9.8 Generic Public Subscription Identifier  PAGEREF _Toc68015595 \h 197

5.9.9 AMF UE NGAP ID  PAGEREF _Toc68015596 \h 197

5.9.10 UE Radio Capability ID  PAGEREF _Toc68015597 \h 197

5.10 Security aspects  PAGEREF _Toc68015598 \h 198

5.10.1 General  PAGEREF _Toc68015599 \h 198

5.10.2 Security Model for non-3GPP access  PAGEREF _Toc68015600 \h 198

5.10.2.1 Signalling Security  PAGEREF _Toc68015601 \h 198

5.10.3 PDU Session User Plane Security  PAGEREF _Toc68015602 \h 198

5.11 Support for Dual Connectivity, Multi-Connectivity  PAGEREF _Toc68015603 \h 200

5.11.1 Support for Dual Connectivity  PAGEREF _Toc68015604 \h 200

5.12 Charging  PAGEREF _Toc68015605 \h 200

5.12.1 General  PAGEREF _Toc68015606 \h 200

5.12.2 Usage Data Reporting for Secondary RAT  PAGEREF _Toc68015607 \h 201

5.12.3 Secondary RAT Periodic Usage Data Reporting Procedure  PAGEREF _Toc68015608 \h 201

5.13 Support for Edge Computing  PAGEREF _Toc68015609 \h 201

5.14 Policy Control  PAGEREF _Toc68015610 \h 202

5.15 Network slicing  PAGEREF _Toc68015611 \h 202

5.15.1 General  PAGEREF _Toc68015612 \h 202

5.15.2 Identification and selection of a Network Slice: the S-NSSAI and the NSSAI  PAGEREF _Toc68015613 \h 203

5.15.2.1 General  PAGEREF _Toc68015614 \h 203

5.15.2.2 Standardised SST values  PAGEREF _Toc68015615 \h 204

5.15.3 Subscription aspects  PAGEREF _Toc68015616 \h 204

5.15.4 UE NSSAI configuration and NSSAI storage aspects  PAGEREF _Toc68015617 \h 205

5.15.4.1 General  PAGEREF _Toc68015618 \h 205

5.15.4.1.1 UE Network Slice configuration  PAGEREF _Toc68015619 \h 205

5.15.4.1.2 Mapping of S-NSSAIs values in the Allowed NSSAI and in the Requested NSSAI to the S-NSSAIs values used in the HPLMN  PAGEREF _Toc68015620 \h 207

5.15.4.2 Update of UE Network Slice configuration  PAGEREF _Toc68015621 \h 207

5.15.5 Detailed Operation Overview  PAGEREF _Toc68015622 \h 208

5.15.5.1 General  PAGEREF _Toc68015623 \h 208

5.15.5.2 Selection of a Serving AMF supporting the Network Slices  PAGEREF _Toc68015624 \h 208

5.15.5.2.1 Registration to a set of Network Slices  PAGEREF _Toc68015625 \h 208

5.15.5.2.2 Modification of the Set of Network Slice(s) for a UE  PAGEREF _Toc68015626 \h 213

5.15.5.2.3 AMF Re-allocation due to Network Slice(s) Support  PAGEREF _Toc68015627 \h 214

5.15.5.3 Establishing a PDU Session in a Network Slice  PAGEREF _Toc68015628 \h 214

5.15.6 Network Slicing Support for Roaming  PAGEREF _Toc68015629 \h 215

5.15.7 Network slicing and Interworking with EPS  PAGEREF _Toc68015630 \h 216

5.15.7.1 General  PAGEREF _Toc68015631 \h 216

5.15.7.2 Idle mode aspects  PAGEREF _Toc68015632 \h 217

5.15.7.3 Connected mode aspects  PAGEREF _Toc68015633 \h 217

5.15.8 Configuration of Network Slice availability in a PLMN  PAGEREF _Toc68015634 \h 218

5.15.9 Operator-controlled inclusion of NSSAI in Access Stratum Connection Establishment  PAGEREF _Toc68015635 \h 218

5.15.10 Network Slice-Specific Authentication and Authorization  PAGEREF _Toc68015636 \h 219

5.15.11 Network Slice Admission Control Function  PAGEREF _Toc68015637 \h 220

5.15.11.1 Maximum number of UEs per network slice admission control  PAGEREF _Toc68015638 \h 220

5.16 Support for specific services  PAGEREF _Toc68015639 \h 221

5.16.1 Public Warning System  PAGEREF _Toc68015640 \h 221

5.16.2 SMS over NAS  PAGEREF _Toc68015641 \h 221

5.16.2.1 General  PAGEREF _Toc68015642 \h 221

5.16.2.2 SMS over NAS transport  PAGEREF _Toc68015643 \h 221

5.16.3 IMS support  PAGEREF _Toc68015644 \h 221

5.16.3.1 General  PAGEREF _Toc68015645 \h 221

5.16.3.2 IMS voice over PS Session Supported Indication over 3GPP access  PAGEREF _Toc68015646 \h 222

5.16.3.2a IMS voice over PS Session Supported Indication over non-3GPP access  PAGEREF _Toc68015647 \h 223

5.16.3.3 Homogeneous support for IMS voice over PS Session supported indication  PAGEREF _Toc68015648 \h 223

5.16.3.4 P-CSCF address delivery  PAGEREF _Toc68015649 \h 223

5.16.3.5 Domain selection for UE originating sessions / calls  PAGEREF _Toc68015650 \h 223

5.16.3.6 Terminating domain selection for IMS voice  PAGEREF _Toc68015651 \h 224

5.16.3.7 UE's usage setting  PAGEREF _Toc68015652 \h 224

5.16.3.8 Domain and Access Selection for UE originating SMS  PAGEREF _Toc68015653 \h 225

5.16.3.8.1 UE originating SMS for IMS Capable UEs supporting SMS over IP  PAGEREF _Toc68015654 \h 225

5.16.3.8.2 Access Selection for SMS over NAS  PAGEREF _Toc68015655 \h 225

5.16.3.9 SMF support for P-CSCF restoration procedure  PAGEREF _Toc68015656 \h 225

5.16.3.10 IMS Voice Service via EPS Fallback or RAT fallback in 5GS  PAGEREF _Toc68015657 \h 225

5.16.3.11 P-CSCF discovery and selection  PAGEREF _Toc68015658 \h 226

5.16.3.12 HSS discovery and selection  PAGEREF _Toc68015659 \h 226

5.16.4 Emergency Services  PAGEREF _Toc68015660 \h 226

5.16.4.1 Introduction  PAGEREF _Toc68015661 \h 226

5.16.4.2 Architecture Reference Model for Emergency Services  PAGEREF _Toc68015662 \h 229

5.16.4.3 Mobility Restrictions and Access Restrictions for Emergency Services  PAGEREF _Toc68015663 \h 229

5.16.4.4 Reachability Management  PAGEREF _Toc68015664 \h 229

5.16.4.5 SMF and UPF selection function for Emergency Services  PAGEREF _Toc68015665 \h 229

5.16.4.6 QoS for Emergency Services  PAGEREF _Toc68015666 \h 230

5.16.4.7 PCC for Emergency Services  PAGEREF _Toc68015667 \h 230

5.16.4.8 IP Address Allocation  PAGEREF _Toc68015668 \h 230

5.16.4.9 Handling of PDU Sessions for Emergency Services  PAGEREF _Toc68015669 \h 230

5.16.4.9a Handling of PDU Sessions for normal services for Emergency Registered UEs  PAGEREF _Toc68015670 \h 230

5.16.4.10 Support of eCall Only Mode  PAGEREF _Toc68015671 \h 230

5.16.4.11 Emergency Services Fallback  PAGEREF _Toc68015672 \h 231

5.16.5 Multimedia Priority Services  PAGEREF _Toc68015673 \h 231

5.16.6 Mission Critical Services  PAGEREF _Toc68015674 \h 233

5.17 Interworking and Migration  PAGEREF _Toc68015675 \h 234

5.17.1 Support for Migration from EPC to 5GC  PAGEREF _Toc68015676 \h 234

5.17.1.1 General  PAGEREF _Toc68015677 \h 234

5.17.1.2 User Plane management to support interworking with EPS  PAGEREF _Toc68015678 \h 236

5.17.2 Interworking with EPC  PAGEREF _Toc68015679 \h 236

5.17.2.1 General  PAGEREF _Toc68015680 \h 236

5.17.2.2 Interworking Procedures with N26 interface  PAGEREF _Toc68015681 \h 239

5.17.2.2.1 General  PAGEREF _Toc68015682 \h 239

5.17.2.2.2 Mobility for UEs in single-registration mode  PAGEREF _Toc68015683 \h 240

5.17.2.3 Interworking Procedures without N26 interface  PAGEREF _Toc68015684 \h 241

5.17.2.3.1 General  PAGEREF _Toc68015685 \h 241

5.17.2.3.2 Mobility for UEs in single-registration mode  PAGEREF _Toc68015686 \h 242

5.17.2.3.3 Mobility for UEs in dual-registration mode  PAGEREF _Toc68015687 \h 243

5.17.2.3.4 Redirection for UEs in connected state  PAGEREF _Toc68015688 \h 244

5.17.2.4 Mobility between 5GS and GERAN/UTRAN  PAGEREF _Toc68015689 \h 244

5.17.3 Interworking with EPC in presence of Non-3GPP PDU Sessions  PAGEREF _Toc68015690 \h 244

5.17.4 Network sharing support and interworking between EPS and 5GS  PAGEREF _Toc68015691 \h 245

5.17.5 Service Exposure in Interworking Scenarios  PAGEREF _Toc68015692 \h 245

5.17.5.1 General  PAGEREF _Toc68015693 \h 245

5.17.5.2 Support of interworking for Monitoring Events  PAGEREF _Toc68015694 \h 246

5.17.5.2.1 Interworking with N26 interface  PAGEREF _Toc68015695 \h 246

5.17.5.2.2 Interworking without N26 interface  PAGEREF _Toc68015696 \h 246

5.17.5.3 Availability or expected level of a service API  PAGEREF _Toc68015697 \h 246

5.17.6 Void  PAGEREF _Toc68015698 \h 247

5.17.7 Configuration Transfer Procedure between NG-RAN and E-UTRAN  PAGEREF _Toc68015699 \h 247

5.17.7.1 Architecture Principles for Configuration Transfer between NG-RAN and E-UTRAN  PAGEREF _Toc68015700 \h 247

5.17.7.2 Addressing, routing and relaying  PAGEREF _Toc68015701 \h 248

5.17.7.2.1 Addressing  PAGEREF _Toc68015702 \h 248

5.17.7.2.2 Routing  PAGEREF _Toc68015703 \h 248

5.17.7.2.3 Relaying  PAGEREF _Toc68015704 \h 248

5.18 Network Sharing  PAGEREF _Toc68015705 \h 248

5.18.1 General concepts  PAGEREF _Toc68015706 \h 248

5.18.2 Broadcast system information for network sharing  PAGEREF _Toc68015707 \h 249

5.18.2a PLMN list handling for network sharing  PAGEREF _Toc68015708 \h 250

5.18.3 Network selection by the UE  PAGEREF _Toc68015709 \h 250

5.18.4 Network selection by the network  PAGEREF _Toc68015710 \h 250

5.18.5 Network Sharing and Network Slicing  PAGEREF _Toc68015711 \h 251

5.19 Control Plane Load Control, Congestion and Overload Control  PAGEREF _Toc68015712 \h 251

5.19.1 General  PAGEREF _Toc68015713 \h 251

5.19.2 TNLA Load Balancing and TNLA Load Re-Balancing  PAGEREF _Toc68015714 \h 251

5.19.3 AMF Load Balancing  PAGEREF _Toc68015715 \h 251

5.19.4 AMF Load Re-Balancing  PAGEREF _Toc68015716 \h 251

5.19.5 AMF Control Of Overload  PAGEREF _Toc68015717 \h 252

5.19.5.1 General  PAGEREF _Toc68015718 \h 252

5.19.5.2 AMF Overload Control  PAGEREF _Toc68015719 \h 252

5.19.6 SMF Overload Control  PAGEREF _Toc68015720 \h 253

5.19.7 NAS level congestion control  PAGEREF _Toc68015721 \h 253

5.19.7.1 General  PAGEREF _Toc68015722 \h 253

5.19.7.2 General NAS level congestion control  PAGEREF _Toc68015723 \h 254

5.19.7.3 DNN based congestion control  PAGEREF _Toc68015724 \h 255

5.19.7.4 S-NSSAI based congestion control  PAGEREF _Toc68015725 \h 256

5.19.7.5 Group specific NAS level congestion control  PAGEREF _Toc68015726 \h 258

5.19.7.6 Control Plane data specific NAS level congestion control  PAGEREF _Toc68015727 \h 258

5.20 External Exposure of Network Capability  PAGEREF _Toc68015728 \h 259

5.20a Data Collection from an AF  PAGEREF _Toc68015729 \h 259

5.21 Architectural support for virtualized deployments  PAGEREF _Toc68015730 \h 260

5.21.0 General  PAGEREF _Toc68015731 \h 260

5.21.1 Architectural support for N2  PAGEREF _Toc68015732 \h 260

5.21.1.1 TNL associations  PAGEREF _Toc68015733 \h 260

5.21.1.2 NGAP UE-TNLA-binding  PAGEREF _Toc68015734 \h 260

5.21.1.3 N2 TNL association selection  PAGEREF _Toc68015735 \h 261

5.21.2 AMF Management  PAGEREF _Toc68015736 \h 261

5.21.2.1 AMF Addition/Update  PAGEREF _Toc68015737 \h 261

5.21.2.2 AMF planned removal procedure  PAGEREF _Toc68015738 \h 261

5.21.2.2.1 AMF planned removal procedure with UDSF deployed  PAGEREF _Toc68015739 \h 261

5.21.2.2.2 AMF planned removal procedure without UDSF  PAGEREF _Toc68015740 \h 263

5.21.2.3 Procedure for AMF Auto-recovery  PAGEREF _Toc68015741 \h 265

5.21.3 Network Reliability support with Sets  PAGEREF _Toc68015742 \h 266

5.21.3.1 General  PAGEREF _Toc68015743 \h 266

5.21.3.2 NF Set and NF Service Set  PAGEREF _Toc68015744 \h 266

5.21.3.3 Reliability of NF instances within the same NF Set  PAGEREF _Toc68015745 \h 267

5.21.3.4 Reliability of NF Services  PAGEREF _Toc68015746 \h 267

5.21.4 Network Function/NF Service Context Transfer  PAGEREF _Toc68015747 \h 267

5.21.4.1 General  PAGEREF _Toc68015748 \h 267

5.22 System Enablers for priority mechanism  PAGEREF _Toc68015749 \h 267

5.22.1 General  PAGEREF _Toc68015750 \h 267

5.22.2 Subscription-related Priority Mechanisms  PAGEREF _Toc68015751 \h 268

5.22.3 Invocation-related Priority Mechanisms  PAGEREF _Toc68015752 \h 268

5.22.4 QoS Mechanisms applied to established QoS Flows  PAGEREF _Toc68015753 \h 270

5.23 Supporting for Asynchronous Type Communication  PAGEREF _Toc68015754 \h 270

5.24 3GPP PS Data Off  PAGEREF _Toc68015755 \h 270

5.25 Support of OAM Features  PAGEREF _Toc68015756 \h 271

5.25.1 Support of Tracing: Signalling Based Activation/Deactivation of Tracing  PAGEREF _Toc68015757 \h 271

5.25.2 Support of OAM-based 5G VN group management  PAGEREF _Toc68015758 \h 272

5.26 Configuration Transfer Procedure  PAGEREF _Toc68015759 \h 272

5.26.1 Architecture Principles for Configuration Transfer  PAGEREF _Toc68015760 \h 272

5.26.2 Addressing, routing and relaying  PAGEREF _Toc68015761 \h 273

5.26.2.1 Addressing  PAGEREF _Toc68015762 \h 273

5.26.2.2 Routing  PAGEREF _Toc68015763 \h 273

5.26.2.3 Relaying  PAGEREF _Toc68015764 \h 273

5.27 Enablers for Time Sensitive Communications and Time Synchronization  PAGEREF _Toc68015765 \h 274

5.27.0 General  PAGEREF _Toc68015766 \h 274

5.27.1 Time Synchronization  PAGEREF _Toc68015767 \h 274

5.27.1.1 General  PAGEREF _Toc68015768 \h 274

5.27.1.2 Distribution of timing information  PAGEREF _Toc68015769 \h 275

5.27.1.2.1 Distribution of 5G internal system clock  PAGEREF _Toc68015770 \h 275

5.27.1.2.2 Distribution of grandmaster clock and time-stamping  PAGEREF _Toc68015771 \h 275

5.27.1.3 Support for multiple TSN working domains  PAGEREF _Toc68015772 \h 277

5.27.1.4 DS-TT and NW-TT Time Synchronization functionality  PAGEREF _Toc68015773 \h 278

5.27.1.5 Detection of (g)PTP Sync and Announce timeouts  PAGEREF _Toc68015774 \h 278

5.27.1.6 Distribution of Announce messages and best master clock selection  PAGEREF _Toc68015775 \h 279

5.27.1.7 Support for PTP grandmaster function in 5GS  PAGEREF _Toc68015776 \h 280

5.27.1.8 Exposure of Time Synchronization  PAGEREF _Toc68015777 \h 280

5.27.1a Periodic deterministic QoS  PAGEREF _Toc68015778 \h 281

5.27.2 TSC Assistance Information (TSCAI)  PAGEREF _Toc68015779 \h 281

5.27.2.1 General  PAGEREF _Toc68015780 \h 281

5.27.2.2 TSC Assistance Container determination based on PSFP  PAGEREF _Toc68015781 \h 282

5.27.2.3 TSC Assistance Container determination by NEF  PAGEREF _Toc68015782 \h 283

5.27.2.4 TSCAI determination based on TSC Assistance Container  PAGEREF _Toc68015783 \h 283

5.27.3 Support for TSC QoS Flows  PAGEREF _Toc68015784 \h 284

5.27.4 Hold and Forward Buffering mechanism  PAGEREF _Toc68015785 \h 284

5.27.5 5G System Bridge delay  PAGEREF _Toc68015786 \h 284

5.28 Support of integration with TSN  PAGEREF _Toc68015787 \h 285

5.28.1 5GS bridge management  PAGEREF _Toc68015788 \h 285

5.28.2 5GS Bridge configuration  PAGEREF _Toc68015789 \h 287

5.28.3 Port and bridge management information exchange in 5GS  PAGEREF _Toc68015790 \h 288

5.28.3.1 General  PAGEREF _Toc68015791 \h 288

5.28.3.2 Transfer of port or bridge management information  PAGEREF _Toc68015792 \h 302

5.28.3.3 VLAN Configuration Information  PAGEREF _Toc68015793 \h 303

5.28.4 QoS mapping tables  PAGEREF _Toc68015794 \h 303

5.29 Support for 5G LAN-type service  PAGEREF _Toc68015795 \h 305

5.29.1 General  PAGEREF _Toc68015796 \h 305

5.29.2 5G VN group management  PAGEREF _Toc68015797 \h 305

5.29.3 PDU Session management  PAGEREF _Toc68015798 \h 306

5.29.4 User Plane handling  PAGEREF _Toc68015799 \h 307

5.30 Support for non-public networks  PAGEREF _Toc68015800 \h 308

5.30.1 General  PAGEREF _Toc68015801 \h 308

5.30.2 Stand-alone non-public networks  PAGEREF _Toc68015802 \h 308

5.30.2.0 General  PAGEREF _Toc68015803 \h 308

5.30.2.1 Identifiers  PAGEREF _Toc68015804 \h 308

5.30.2.2 Broadcast system information  PAGEREF _Toc68015805 \h 309

5.30.2.3 UE configuration and subscription aspects  PAGEREF _Toc68015806 \h 309

5.30.2.4 Network selection in SNPN access mode  PAGEREF _Toc68015807 \h 310

5.30.2.4.1 General  PAGEREF _Toc68015808 \h 310

5.30.2.4.3 Manual network selection  PAGEREF _Toc68015809 \h 311

5.30.2.5 Network access control  PAGEREF _Toc68015810 \h 311

5.30.2.6 Cell (re-)selection in SNPN access mode  PAGEREF _Toc68015811 \h 312

5.30.2.7 Access to PLMN services via stand-alone non-public networks  PAGEREF _Toc68015812 \h 312

5.30.2.8 Access to stand-alone non-public network services via PLMN  PAGEREF _Toc68015813 \h 312

5.30.2.9 SNPN connectivity for UEs with credentials owned by Credentials Holder  PAGEREF _Toc68015814 \h 313

5.30.2.9.1 General  PAGEREF _Toc68015815 \h 313

5.30.2.9.2 Credentials Holder using AAA Server for primary authentication and authorization  PAGEREF _Toc68015816 \h 313

5.30.2.9.3 Credentials Holder using AUSF and UDM for primary authentication and authorization  PAGEREF _Toc68015817 \h 314

5.30.3 Public Network Integrated NPN  PAGEREF _Toc68015818 \h 314

5.30.3.1 General  PAGEREF _Toc68015819 \h 314

5.30.3.2 Identifiers  PAGEREF _Toc68015820 \h 315

5.30.3.3 UE configuration, subscription aspects and storage  PAGEREF _Toc68015821 \h 315

5.30.3.4 Network and cell (re-)selection, and access control  PAGEREF _Toc68015822 \h 315

5.30.3.5 Support of emergency services in CAG cells  PAGEREF _Toc68015823 \h 317

5.31 Support for Cellular IoT  PAGEREF _Toc68015824 \h 317

5.31.1 General  PAGEREF _Toc68015825 \h 317

5.31.2 Preferred and Supported Network Behaviour  PAGEREF _Toc68015826 \h 317

5.31.3 Selection, steering and redirection between EPS and 5GS  PAGEREF _Toc68015827 \h 318

5.31.4 Control Plane CIoT 5GS Optimisation  PAGEREF _Toc68015828 \h 319

5.31.4.1 General  PAGEREF _Toc68015829 \h 319

5.31.4.2 Establishment of N3 data transfer during Data Transport in Control Plane CIoT 5GS Optimisation  PAGEREF _Toc68015830 \h 320

5.31.4.3 Control Plane Relocation Indication procedure  PAGEREF _Toc68015831 \h 320

5.31.5 Non-IP Data Delivery (NIDD)  PAGEREF _Toc68015832 \h 321

5.31.6 Reliable Data Service  PAGEREF _Toc68015833 \h 321

5.31.7 Power Saving Enhancements  PAGEREF _Toc68015834 \h 322

5.31.7.1 General  PAGEREF _Toc68015835 \h 322

5.31.7.2 Extended Discontinuous Reception (DRX) for CM-IDLE and CM-CONNECTED with RRC-INACTIVE  PAGEREF _Toc68015836 \h 322

5.31.7.2.1 Overview  PAGEREF _Toc68015837 \h 322

5.31.7.2.2 Paging for extended idle mode DRX in E-UTRA connected to 5GC  PAGEREF _Toc68015838 \h 324

5.31.7.2.3 Paging for a UE registered in a tracking area with heterogeneous support of extended idle mode DRX  PAGEREF _Toc68015839 \h 325

5.31.7.3 MICO mode with Extended Connected Time  PAGEREF _Toc68015840 \h 325

5.31.7.4 MICO mode with Active Time  PAGEREF _Toc68015841 \h 325

5.31.7.5 MICO mode and Periodic Registration Timer Control  PAGEREF _Toc68015842 \h 325

5.31.8 High latency communication  PAGEREF _Toc68015843 \h 326

5.31.9 Support for Monitoring Events  PAGEREF _Toc68015844 \h 327

5.31.10 NB-IoT UE Radio Capability Handling  PAGEREF _Toc68015845 \h 327

5.31.11 Inter-RAT idle mode mobility to and from NB-IoT  PAGEREF _Toc68015846 \h 327

5.31.12 Restriction of use of Enhanced Coverage  PAGEREF _Toc68015847 \h 328

5.31.13 Paging for Enhanced Coverage  PAGEREF _Toc68015848 \h 329

5.31.14 Support of rate control of user data  PAGEREF _Toc68015849 \h 329

5.31.14.1 General  PAGEREF _Toc68015850 \h 329

5.31.14.2 Serving PLMN Rate Control  PAGEREF _Toc68015851 \h 329

5.31.14.3 Small Data Rate Control  PAGEREF _Toc68015852 \h 330

5.31.15 Control Plane Data Transfer Congestion Control  PAGEREF _Toc68015853 \h 331

5.31.16 Service Gap Control  PAGEREF _Toc68015854 \h 331

5.31.17 Inter-UE QoS for NB-IoT  PAGEREF _Toc68015855 \h 333

5.31.18 User Plane CIoT 5GS Optimisation  PAGEREF _Toc68015856 \h 333

5.31.19 QoS model for NB-IoT  PAGEREF _Toc68015857 \h 334

5.31.20 Category M UEs differentiation  PAGEREF _Toc68015858 \h 334

5.32 Support for ATSSS  PAGEREF _Toc68015859 \h 335

5.32.1 General  PAGEREF _Toc68015860 \h 335

5.32.2 Multi Access PDU Sessions  PAGEREF _Toc68015861 \h 336

5.32.3 Policy for ATSSS Control  PAGEREF _Toc68015862 \h 338

5.32.4 QoS Support  PAGEREF _Toc68015863 \h 339

5.32.5 Access Network Performance Measurements  PAGEREF _Toc68015864 \h 340

5.32.5.1 General principles  PAGEREF _Toc68015865 \h 340

5.32.5.2 Round Trip Time Measurements  PAGEREF _Toc68015866 \h 341

5.32.5.2a Packet Loss Rate Measurements  PAGEREF _Toc68015867 \h 342

5.32.5.3 Access Availability/Unavailability Report  PAGEREF _Toc68015868 \h 343

5.32.5.4 Protocol stack for user plane measurements and measurement reports  PAGEREF _Toc68015869 \h 343

5.32.6 Support of Steering Functionalities  PAGEREF _Toc68015870 \h 344

5.32.6.1 General  PAGEREF _Toc68015871 \h 344

5.32.6.2 High-Layer Steering Functionalities  PAGEREF _Toc68015872 \h 346

5.32.6.2.1 MPTCP Functionality  PAGEREF _Toc68015873 \h 346

5.32.6.3 Low-Layer Steering Functionalities  PAGEREF _Toc68015874 \h 347

5.32.6.3.1 ATSSS-LL Functionality  PAGEREF _Toc68015875 \h 347

5.32.7 Interworking with EPS  PAGEREF _Toc68015876 \h 347

5.32.7.1 General  PAGEREF _Toc68015877 \h 347

5.32.7.2 Interworking with N26 Interface  PAGEREF _Toc68015878 \h 347

5.32.7.3 Interworking without N26 Interface  PAGEREF _Toc68015879 \h 348

5.32.8 ATSSS Rules  PAGEREF _Toc68015880 \h 348

5.33 Support for Ultra Reliable Low Latency Communication  PAGEREF _Toc68015881 \h 351

5.33.1 General  PAGEREF _Toc68015882 \h 351

5.33.2 Redundant transmission for high reliability communication  PAGEREF _Toc68015883 \h 351

5.33.2.1 Dual Connectivity based end to end Redundant User Plane Paths  PAGEREF _Toc68015884 \h 351

5.33.2.2 Support of redundant transmission on N3/N9 interfaces  PAGEREF _Toc68015885 \h 353

5.33.2.3 Support for redundant transmission at transport layer  PAGEREF _Toc68015886 \h 355

5.33.3 QoS Monitoring to Assist URLLC Service  PAGEREF _Toc68015887 \h 355

5.33.3.1 General  PAGEREF _Toc68015888 \h 355

5.33.3.2 Per QoS Flow per UE QoS Monitoring  PAGEREF _Toc68015889 \h 355

5.33.3.3 GTP-U Path Monitoring  PAGEREF _Toc68015890 \h 356

5.34 Support of deployments topologies with specific SMF Service Areas  PAGEREF _Toc68015891 \h 357

5.34.1 General  PAGEREF _Toc68015892 \h 357

5.34.2 Architecture  PAGEREF _Toc68015893 \h 358

5.34.2.1 SBA architecture  PAGEREF _Toc68015894 \h 358

5.34.2.2 Non-roaming architecture  PAGEREF _Toc68015895 \h 358

5.34.2.3 Roaming architecture  PAGEREF _Toc68015896 \h 359

5.34.3 I-SMF selection, V-SMF reselection  PAGEREF _Toc68015897 \h 360

5.34.4 Usage of an UL Classifier for a PDU Session controlled by I-SMF  PAGEREF _Toc68015898 \h 361

5.34.5 Usage of IPv6 multi-homing for a PDU Session controlled by I-SMF  PAGEREF _Toc68015899 \h 361

5.34.6 Interaction between I-SMF and SMF for the support of traffic offload by UPF controlled by the I-SMF  PAGEREF _Toc68015900 \h 362

5.34.6.1 General  PAGEREF _Toc68015901 \h 362

5.34.6.2 N4 information sent from SMF to I-SMF for local traffic offload  PAGEREF _Toc68015902 \h 362

5.34.7 Event Management  PAGEREF _Toc68015903 \h 363

5.34.7.1 UE's Mobility Event Management  PAGEREF _Toc68015904 \h 363

5.34.7.2 SMF event exposure service  PAGEREF _Toc68015905 \h 363

5.34.7.3 AMF implicit subscription about events related with the PDU Session  PAGEREF _Toc68015906 \h 364

5.34.8 Support for Cellular IoT  PAGEREF _Toc68015907 \h 364

5.34.9 Support of the Deployment Topologies with specific SMF Service Areas feature within and between PLMN(s)  PAGEREF _Toc68015908 \h 364

5.34.10 Support for 5G LAN-type service  PAGEREF _Toc68015909 \h 364

5.35 Support for Integrated access and backhaul (IAB)  PAGEREF _Toc68015910 \h 365

5.35.1 IAB architecture and functional entities  PAGEREF _Toc68015911 \h 365

5.35.2 5G System enhancements to support IAB  PAGEREF _Toc68015912 \h 366

5.35.3 Data handling and QoS support with IAB  PAGEREF _Toc68015913 \h 366

5.35.4 Mobility support with IAB  PAGEREF _Toc68015914 \h 367

5.35.5 Charging support with IAB  PAGEREF _Toc68015915 \h 367

5.35.6 IAB operation involving EPC  PAGEREF _Toc68015916 \h 367

5.36 RIM Information Transfer  PAGEREF _Toc68015917 \h 367

5.37 Support for high data rate low latency services  PAGEREF _Toc68015918 \h 367

6 Network Functions  PAGEREF _Toc68015919 \h 367

6.1 General  PAGEREF _Toc68015920 \h 367

6.2 Network Function Functional description  PAGEREF _Toc68015921 \h 368

6.2.1 AMF  PAGEREF _Toc68015922 \h 368

6.2.2 SMF  PAGEREF _Toc68015923 \h 369

6.2.3 UPF  PAGEREF _Toc68015924 \h 370

6.2.4 PCF  PAGEREF _Toc68015925 \h 371

6.2.5 NEF  PAGEREF _Toc68015926 \h 371

6.2.5.0 NEF functionality  PAGEREF _Toc68015927 \h 371

6.2.5.1 Support for CAPIF  PAGEREF _Toc68015928 \h 372

6.2.5a Void  PAGEREF _Toc68015929 \h 372

6.2.6 NRF  PAGEREF _Toc68015930 \h 373

6.2.6.1 General  PAGEREF _Toc68015931 \h 373

6.2.6.2 NF profile  PAGEREF _Toc68015932 \h 373

6.2.6.3 SCP profile  PAGEREF _Toc68015933 \h 375

6.2.7 UDM  PAGEREF _Toc68015934 \h 375

6.2.8 AUSF  PAGEREF _Toc68015935 \h 376

6.2.9 N3IWF  PAGEREF _Toc68015936 \h 376

6.2.9A TNGF  PAGEREF _Toc68015937 \h 376

6.2.10 AF  PAGEREF _Toc68015938 \h 377

6.2.11 UDR  PAGEREF _Toc68015939 \h 377

6.2.12 UDSF  PAGEREF _Toc68015940 \h 377

6.2.13 SMSF  PAGEREF _Toc68015941 \h 378

6.2.14 NSSF  PAGEREF _Toc68015942 \h 378

6.2.15 5G-EIR  PAGEREF _Toc68015943 \h 378

6.2.16 LMF  PAGEREF _Toc68015944 \h 378

6.2.16A GMLC  PAGEREF _Toc68015945 \h 378

6.2.17 SEPP  PAGEREF _Toc68015946 \h 378

6.2.18 Network Data Analytics Function (NWDAF)  PAGEREF _Toc68015947 \h 379

6.2.19 SCP  PAGEREF _Toc68015948 \h 379

6.2.20 W-AGF  PAGEREF _Toc68015949 \h 379

6.2.21 UE radio Capability Management Function (UCMF)  PAGEREF _Toc68015950 \h 380

6.2.22 TWIF  PAGEREF _Toc68015951 \h 380

6.2.23 NSSAAF  PAGEREF _Toc68015952 \h 380

6.2.24 DCCF  PAGEREF _Toc68015953 \h 380

6.2.25 MFAF  PAGEREF _Toc68015954 \h 381

6.2.26 ADRF  PAGEREF _Toc68015955 \h 381

6.3 Principles for Network Function and Network Function Service discovery and selection  PAGEREF _Toc68015956 \h 381

6.3.1 General  PAGEREF _Toc68015957 \h 381

6.3.1.0 Principles for Binding, Selection and Reselection  PAGEREF _Toc68015958 \h 383

6.3.1.1 NF Discovery and Selection aspects relevant with indirect communication  PAGEREF _Toc68015959 \h 385

6.3.1.2 Location information  PAGEREF _Toc68015960 \h 385

6.3.2 SMF discovery and selection  PAGEREF _Toc68015961 \h 385

6.3.3 User Plane Function Selection  PAGEREF _Toc68015962 \h 388

6.3.3.1 Overview  PAGEREF _Toc68015963 \h 388

6.3.3.2 SMF Provisioning of available UPF(s)  PAGEREF _Toc68015964 \h 388

6.3.3.3 Selection of an UPF for a particular PDU Session  PAGEREF _Toc68015965 \h 388

6.3.4 AUSF discovery and selection  PAGEREF _Toc68015966 \h 390

6.3.5 AMF discovery and selection  PAGEREF _Toc68015967 \h 390

6.3.6 N3IWF selection  PAGEREF _Toc68015968 \h 393

6.3.6.1 General  PAGEREF _Toc68015969 \h 393

6.3.6.2 Stand-alone N3IWF selection  PAGEREF _Toc68015970 \h 393

6.3.6.2a SNPN N3IWF selection  PAGEREF _Toc68015971 \h 394

6.3.6.3 Combined N3IWF/ePDG Selection  PAGEREF _Toc68015972 \h 395

6.3.6.4 PLMN Selection for emergency services  PAGEREF _Toc68015973 \h 395

6.3.7 PCF discovery and selection  PAGEREF _Toc68015974 \h 396

6.3.7.0 General principles  PAGEREF _Toc68015975 \h 396

6.3.7.1 PCF discovery and selection for a UE or a PDU Session  PAGEREF _Toc68015976 \h 396

6.3.7.2 Providing policy requirements that apply to multiple UE and hence to multiple PCF  PAGEREF _Toc68015977 \h 399

6.3.7.3 Binding an AF request targeting a UE address to the relevant PCF  PAGEREF _Toc68015978 \h 399

6.3.7.4 Binding an AF request targeting a UE to the relevant PCF  PAGEREF _Toc68015979 \h 399

6.3.8 UDM discovery and selection  PAGEREF _Toc68015980 \h 399

6.3.9 UDR discovery and selection  PAGEREF _Toc68015981 \h 400

6.3.10 SMSF discovery and selection  PAGEREF _Toc68015982 \h 401

6.3.11 CHF discovery and selection  PAGEREF _Toc68015983 \h 401

6.3.12 Trusted Non-3GPP Access Network selection  PAGEREF _Toc68015984 \h 402

6.3.12.1 General  PAGEREF _Toc68015985 \h 402

6.3.12.2 Access Network Selection Procedure  PAGEREF _Toc68015986 \h 404

6.3.12a Access Network selection for devices that do not support 5GC NAS over WLAN  PAGEREF _Toc68015987 \h 406

6.3.12a.1 General  PAGEREF _Toc68015988 \h 406

6.3.12a.2 Access Network Selection Procedure  PAGEREF _Toc68015989 \h 406

6.3.13 NWDAF discovery and selection  PAGEREF _Toc68015990 \h 407

6.3.14 NEF Discovery  PAGEREF _Toc68015991 \h 408

6.3.15 UCMF Discovery and Selection  PAGEREF _Toc68015992 \h 409

6.3.16 SCP discovery and selection  PAGEREF _Toc68015993 \h 409

6.3.17 NSSAAF discovery and selection  PAGEREF _Toc68015994 \h 409

6.3.18 5G-EIR discovery and selection  PAGEREF _Toc68015995 \h 409

6.3.19 DCCF discovery and selection  PAGEREF _Toc68015996 \h 409

6.3.20 ADRF discovery and selection  PAGEREF _Toc68015997 \h 410

6.3.21 MFAF discovery and selection  PAGEREF _Toc68015998 \h 410

6.3.22 NSACF discovery and selection  PAGEREF _Toc68015999 \h 410

7 Network Function Services and descriptions  PAGEREF _Toc68016000 \h 411

7.1 Network Function Service Framework  PAGEREF _Toc68016001 \h 411

7.1.1 General  PAGEREF _Toc68016002 \h 411

7.1.2 NF Service Consumer - NF Service Producer interactions  PAGEREF _Toc68016003 \h 411

7.1.3 Network Function Service discovery  PAGEREF _Toc68016004 \h 414

7.1.4 Network Function Service Authorization  PAGEREF _Toc68016005 \h 414

7.1.5 Network Function and Network Function Service registration and de-registration  PAGEREF _Toc68016006 \h 415

7.2 Network Function Services  PAGEREF _Toc68016007 \h 415

7.2.1 General  PAGEREF _Toc68016008 \h 415

7.2.2 AMF Services  PAGEREF _Toc68016009 \h 416

7.2.3 SMF Services  PAGEREF _Toc68016010 \h 417

7.2.4 PCF Services  PAGEREF _Toc68016011 \h 417

7.2.5 UDM Services  PAGEREF _Toc68016012 \h 418

7.2.6 NRF Services  PAGEREF _Toc68016013 \h 419

7.2.7 AUSF Services  PAGEREF _Toc68016014 \h 420

7.2.8 NEF Services  PAGEREF _Toc68016015 \h 420

7.2.8A Void  PAGEREF _Toc68016016 \h 421

7.2.9 SMSF Services  PAGEREF _Toc68016017 \h 422

7.2.10 UDR Services  PAGEREF _Toc68016018 \h 422

7.2.11 5G-EIR Services  PAGEREF _Toc68016019 \h 422

7.2.12 NWDAF Services  PAGEREF _Toc68016020 \h 422

7.2.13 UDSF Services  PAGEREF _Toc68016021 \h 423

7.2.14 NSSF Services  PAGEREF _Toc68016022 \h 423

7.2.15 BSF Services  PAGEREF _Toc68016023 \h 423

7.2.16 LMF Services  PAGEREF _Toc68016024 \h 423

7.2.16A GMLC Services  PAGEREF _Toc68016025 \h 423

7.2.17 CHF Services  PAGEREF _Toc68016026 \h 424

7.2.18 UCMF Services  PAGEREF _Toc68016027 \h 424

7.2.19 AF Services  PAGEREF _Toc68016028 \h 425

7.2.20 NSSAAF Services  PAGEREF _Toc68016029 \h 425

7.2.21 DCCF Services  PAGEREF _Toc68016030 \h 426

7.2.22 MFAF Services  PAGEREF _Toc68016031 \h 426

7.2.23 ADRF Services  PAGEREF _Toc68016032 \h 426

7.2.24 5G DDNMF Services  PAGEREF _Toc68016033 \h 427

7.3 Exposure  PAGEREF _Toc68016034 \h 427

8 Control and User Plane Protocol Stacks  PAGEREF _Toc68016035 \h 427

8.1 General  PAGEREF _Toc68016036 \h 427

8.2 Control Plane Protocol Stacks  PAGEREF _Toc68016037 \h 427

8.2.1 Control Plane Protocol Stacks between the 5G-AN and the 5G Core: N2  PAGEREF _Toc68016038 \h 427

8.2.1.1 General  PAGEREF _Toc68016039 \h 427

8.2.1.2 5G-AN - AMF  PAGEREF _Toc68016040 \h 428

8.2.1.3 5G-AN - SMF  PAGEREF _Toc68016041 \h 428

8.2.2 Control Plane Protocol Stacks between the UE and the 5GC  PAGEREF _Toc68016042 \h 429

8.2.2.1 General  PAGEREF _Toc68016043 \h 429

8.2.2.2 UE - AMF  PAGEREF _Toc68016044 \h 430

8.2.2.3 UE – SMF  PAGEREF _Toc68016045 \h 430

8.2.3 Control Plane Protocol Stacks between the network functions in 5GC  PAGEREF _Toc68016046 \h 431

8.2.3.1 The Control Plane Protocol Stack for the service based interface  PAGEREF _Toc68016047 \h 431

8.2.3.2 The Control Plane protocol stack for the N4 interface between SMF and UPF  PAGEREF _Toc68016048 \h 431

8.2.4 Control Plane for untrusted non 3GPP Access  PAGEREF _Toc68016049 \h 432

8.2.5 Control Plane for trusted non-3GPP Access  PAGEREF _Toc68016050 \h 433

8.2.6 Control Plane for W-5GAN Access  PAGEREF _Toc68016051 \h 433

8.3 User Plane Protocol Stacks  PAGEREF _Toc68016052 \h 433

8.3.1 User Plane Protocol Stack for a PDU Session  PAGEREF _Toc68016053 \h 433

8.3.2 User Plane for untrusted non-3GPP Access  PAGEREF _Toc68016054 \h 435

8.3.3 User Plane for trusted non-3GPP Access  PAGEREF _Toc68016055 \h 435

8.3.4 User Plane for W-5GAN Access  PAGEREF _Toc68016056 \h 435

8.3.5 User Plane for N19-based forwarding of a 5G VN group  PAGEREF _Toc68016057 \h 436

Annex A (informative): Relationship between Service-Based Interfaces and Reference Points  PAGEREF _Toc68016058 \h 437

Annex B (normative): Mapping between temporary identities  PAGEREF _Toc68016059 \h 439

Annex C (informative): Guidelines and Principles for Compute-Storage Separation  PAGEREF _Toc68016060 \h 440

Annex D (informative): 5GS support for Non-Public Network deployment options  PAGEREF _Toc68016061 \h 441

D.1 Introduction  PAGEREF _Toc68016062 \h 441

D.2 Support of Non-Public Network as a network slice of a PLMN  PAGEREF _Toc68016063 \h 441

D.3 Support for access to PLMN services via Stand-alone Non-Public Network and access to Stand-alone Non Public Network services via PLMN  PAGEREF _Toc68016064 \h 442

D.4 Support for UE capable of simultaneously connecting to an SNPN and a PLMN  PAGEREF _Toc68016065 \h 443

D.5 Support for keeping UE in CM-CONNECTED state in overlay network when accessing services via NWu  PAGEREF _Toc68016066 \h 443

D.6 Support for session/service continuity between SNPN and PLMN when using N3IWF  PAGEREF _Toc68016067 \h 444

Annex E (informative): Communication models for NF/NF services interaction  PAGEREF _Toc68016068 \h 446

E.1 General  PAGEREF _Toc68016069 \h 446

Annex F (informative): Redundant user plane paths based on multiple UEs per device  PAGEREF _Toc68016070 \h 448

Annex G (informative): SCP Deployment Examples  PAGEREF _Toc68016071 \h 451

G.1 General  PAGEREF _Toc68016072 \h 451

G.2 An SCP based on service mesh  PAGEREF _Toc68016073 \h 451

G.2.1 Introduction  PAGEREF _Toc68016074 \h 451

G.2.2 Communication across service mesh boundaries  PAGEREF _Toc68016075 \h 452

G.3 An SCP based on independent deployment units  PAGEREF _Toc68016076 \h 453

G.4 An SCP deployment example based on name-based routing  PAGEREF _Toc68016077 \h 454

G.4.0 General Information  PAGEREF _Toc68016078 \h 454

G.4.1 Service Registration and Service Discovery  PAGEREF _Toc68016079 \h 455

G.4.2 Overview of Deployment Scenario  PAGEREF _Toc68016080 \h 456

G.4.3 References  PAGEREF _Toc68016081 \h 456

Annex H (normative): PTP usage guidelines  PAGEREF _Toc68016082 \h 457

H.1 General  PAGEREF _Toc68016083 \h 457

H.2 Signalling of ingress time for time synchronization  PAGEREF _Toc68016084 \h 457

H.3 Void  PAGEREF _Toc68016085 \h 457

H.4 Path and Link delay measurements  PAGEREF _Toc68016086 \h 457

Annex I (normative): TSN usage guidelines  PAGEREF _Toc68016087 \h 459

I.1 Determination of traffic pattern information  PAGEREF _Toc68016088 \h 459

Annex J (informative): Link MTU considerations  PAGEREF _Toc68016089 \h 461

Annex K (normative): Port and bridge management information exchange  PAGEREF _Toc68016090 \h 463

K.1 Standardized port and bridge management information  PAGEREF _Toc68016091 \h 463

K.2 Port and bridge management information exchange for time synchronization  PAGEREF _Toc68016092 \h 463

K.2.1 Capability exchange  PAGEREF _Toc68016093 \h 463

K.2.2 PTP Instance configuration  PAGEREF _Toc68016094 \h 463

K.2.2.1 General  PAGEREF _Toc68016095 \h 463

K.2.2.2 Configuration for Sync and Announce reception timeouts  PAGEREF _Toc68016096 \h 464

K.2.2.3 Configuration for PTP port states  PAGEREF _Toc68016097 \h 464

K.2.2.4 Configuration for PTP grandmaster function  PAGEREF _Toc68016098 \h 464

K.2.2.5 Configuration for Sync and Announce intervals  PAGEREF _Toc68016099 \h 465

Annex L (informative): Change history  PAGEREF _Toc68016100 \h 466