【资料名称】：TS 23.501v1 5G核心网架构和流程

【资料作者】：3GPP

【资料日期】：20170601

【资料语言】：英文

Foreword.............................................................................................................................................. 10

1....... Scope......................................................................................................................................... 11

2....... References.................................................................................................................................. 11

3....... Definitions, symbols and abbreviations......................................................................................... 12

3.1......... Definitions.......................................................................................................................................................................... 12

3.2......... Abbreviations.................................................................................................................................................................... 14

4....... Architecture model and concepts.................................................................................................. 14

4.1......... General concepts............................................................................................................................................................... 14

4.2......... Architecture reference model......................................................................................................................................... 15

4.2.1............ General......................................................................................................................................................................... 15

4.2.2............ Network Functions and entities................................................................................................................................ 15

4.2.3............ Non-roaming reference architecture........................................................................................................................ 16

4.2.4............ Roaming reference architectures............................................................................................................................. 18

4.2.5............ Data Storage architectures........................................................................................................................................ 22

4.2.6............ Service-based interfaces............................................................................................................................................ 23

4.2.7............ Reference points......................................................................................................................................................... 23

4.2.8............ Support of non-3GPP access.................................................................................................................................... 24

4.2.8.1.............. General Concepts to Support Non-3GPP Access........................................................................................... 24

4.2.8.2.............. Architecture Reference Model for Non-3GPP Accesses............................................................................... 25

4.2.8.2.1................ Non-roaming Architecture for Non-3GPP Accesses............................................................................... 25

4.2.8.2.2................ Roaming Architecture for LBO for Non-3GPP Accesses, N3IWF in same PLMN as 3GPP access 26

4.2.8.2.3................ Home-routed Roaming Architecture for Non-3GPP Accesses, N3IWF in same PLMN as 3GPP access........................................................................................................................................................................... 27

4.2.8.2.4................ Roaming Architecture for LBO for Non-3GPP Accesses, N3IWF in different PLMN from 3GPP access........................................................................................................................................................................... 28

4.2.8.2.5................ Home-routed Roaming Architecture for Non-3GPP Accesses, N3IWF in different PLMN from 3GPP access................................................................................................................................................................ 28

4.2.8.3.............. Non-3GPP Access Reference Points................................................................................................................ 30

4.3......... Interworking with E-UTRAN connected to EPC........................................................................................................ 30

4.3.1............ Non-roaming architecture......................................................................................................................................... 30

4.3.2............ Roaming architecture................................................................................................................................................. 31

4.4......... Specific services................................................................................................................................................................ 32

4.4.1............ Public Warning System............................................................................................................................................. 32

4.4.2............ SMS over NAS........................................................................................................................................................... 32

4.4.2.1.............. Architecture to support SMS over NAS........................................................................................................... 32

4.4.2.2.............. Reference point to support SMS over NAS..................................................................................................... 33

4.4.2.3.............. Service based interface to support SMS over NAS........................................................................................ 33

4.4.3............ IMS support................................................................................................................................................................. 34

4.4.4............ Location services........................................................................................................................................................ 34

4.4.5............ Application Triggering Services.............................................................................................................................. 34

5....... High level features...................................................................................................................... 34

5.1......... General................................................................................................................................................................................ 34

5.2......... Network Access Control.................................................................................................................................................. 34

5.3......... Registration and Connection Management.................................................................................................................. 34

5.3.1............ General......................................................................................................................................................................... 34

5.3.2............ Registration Management......................................................................................................................................... 35

5.3.2.1.............. General................................................................................................................................................................... 35

5.3.2.2.............. 5GS Registration Management states............................................................................................................... 35

5.3.2.2.1................ General............................................................................................................................................................. 35

5.3.2.2.2................ RM-DEREGISTERED state........................................................................................................................ 35

5.3.2.2.3................ RM-REGISTERED state.............................................................................................................................. 35

5.3.2.2.4................ 5GS Registration Management State models............................................................................................ 36

5.3.2.3.............. Registration Area management.......................................................................................................................... 37

5.3.2.4.............. Support of a UE registered over both 3GPP and Non3GPP access............................................................. 37

5.3.3............ Connection Management.......................................................................................................................................... 38

5.3.3.1.............. General................................................................................................................................................................... 39

5.3.3.2.............. 5GS Connection Management states................................................................................................................ 39

5.3.3.2.1................ General............................................................................................................................................................. 39

5.3.3.2.2................ CM-IDLE state............................................................................................................................................... 39

5.3.3.2.3................ CM-CONNECTED state.............................................................................................................................. 39

5.3.3.2.4................ 5GS Connection Management State models............................................................................................. 40

5.3.3.2.5................ CM-CONNECTED with RRC inactive state............................................................................................ 40

5.3.3.3.............. NAS signalling connection management......................................................................................................... 42

5.3.3.3.1................ General............................................................................................................................................................. 42

5.3.3.3.2................ NAS signalling connection establishment................................................................................................. 42

5.3.3.3.3................ NAS signalling connection Release............................................................................................................ 42

5.3.3.4.............. Support of a UE connected over both 3GPP and Non-3GPP access........................................................... 42

5.3.4............ UE Mobility................................................................................................................................................................. 42

5.3.4.1.............. Mobility Restrictions........................................................................................................................................... 42

5.3.4.1.1................ General............................................................................................................................................................. 42

5.3.4.1.2................ Management of service area restrictions.................................................................................................... 43

5.4......... 3GPP access specific aspects.......................................................................................................................................... 44

5.4.1............ UE reachability in CM-IDLE................................................................................................................................... 44

5.4.1.1.............. General................................................................................................................................................................... 44

5.4.1.2.............. UE reachability allowing mobile terminated data while the UE is CM-IDLE.......................................... 45

5.4.1.2.1................ General characteristics.................................................................................................................................. 45

5.4.1.3.............. Mobile Initiated Connection only (MICO) mode........................................................................................... 45

5.4.1.4.............. Mobile Deregistration at the End of Communication.................................................................................... 46

5.4.2............ UE reachability in CM-CONNECTED.................................................................................................................. 46

5.4.3............ Paging Policy Differentiation................................................................................................................................... 46

5.5......... Non-3GPP access specific aspects................................................................................................................................. 47

5.5.1............ Registration Management......................................................................................................................................... 47

5.5.2............ Connection Management.......................................................................................................................................... 47

5.5.3............ UE Reachability.......................................................................................................................................................... 48

5.5.3.1.............. UE reachability in CM-IDLE............................................................................................................................. 48

5.5.3.2.............. UE reachability in CM-CONNECTED............................................................................................................ 48

5.6......... Session Management........................................................................................................................................................ 49

5.6.1............ Overview...................................................................................................................................................................... 49

5.6.2............ Interaction between AMF and SMF........................................................................................................................ 50

5.6.3............ Roaming....................................................................................................................................................................... 51

5.6.4............ Single PDU session with multiple PDU session anchors.................................................................................... 52

5.6.4.1.............. General................................................................................................................................................................... 52

5.6.4.2.............. Usage of an UL Classifier for a PDU session................................................................................................. 53

5.6.4.3.............. Usage of IPv6 multi-homing for a PDU session............................................................................................. 54

5.6.5............ Support for advertising the availability of a local area data network................................................................ 55

5.6.6............ DN authorization of the establishment of a PDU session................................................................................... 56

5.6.7............ Application Function influence on traffic routing................................................................................................ 56

5.6.8............ Selective activation of UP connection of existing PDU session........................................................................ 59

5.6.9............ Session and Service Continuity................................................................................................................................ 59

5.6.9.1.............. General................................................................................................................................................................... 59

5.6.9.2.............. SSC mode.............................................................................................................................................................. 60

5.6.9.2.1........... SSC Mode 1.......................................................................................................................................................... 60

5.6.9.2.2........... SSC Mode 2.......................................................................................................................................................... 60

5.6.9.2.3........... SSC Mode 3.......................................................................................................................................................... 60

5.6.9.3.............. SSC mode selection............................................................................................................................................. 61

5.6.10.......... Tunnelling for Unstructured PDU type data.......................................................................................................... 61

5.6.11.......... UE Location change notification............................................................................................................................. 62

5.7......... QoS model.......................................................................................................................................................................... 62

5.7.1............ General Overview....................................................................................................................................................... 62

5.7.2............ 5G QoS Parameters.................................................................................................................................................... 65

5.7.3............ 5G QoS characteristics.............................................................................................................................................. 66

5.7.4............ Standardized 5QI to QoS characteristics mapping............................................................................................... 67

5.7.5............ Reflective QoS............................................................................................................................................................ 68

5.7.5.1.............. General................................................................................................................................................................... 68

5.7.5.2.............. UE Reflective QoS Procedures.......................................................................................................................... 68

5.7.5.2.1................ General............................................................................................................................................................. 68

5.7.5.2.2................ UE Derived QoS Rule................................................................................................................................... 69

5.7.5.3.............. UPF Procedures for Supporting Reflective QoS............................................................................................ 69

5.7.5.4.............. Reflective QoS Control....................................................................................................................................... 69

5.7.5.4.1................ General............................................................................................................................................................. 69

5.7.5.4.2................ Reflective QoS Control via User Plane...................................................................................................... 69

5.7.5.4.3................ Reflective QoS Control via Control Plane................................................................................................. 70

5.8......... User plane Management.................................................................................................................................................. 70

5.8.1............ IP address management............................................................................................................................................. 70

5.8.1.1.............. General................................................................................................................................................................... 70

5.8.1.2.............. Routing rules configuration................................................................................................................................ 71

5.8.2............ User Plane Function(s).............................................................................................................................................. 71

5.8.3............ UP tunnel management for UE in Idle state.......................................................................................................... 72

5.9......... Identifiers........................................................................................................................................................................... 72

5.9.1............ General......................................................................................................................................................................... 72

5.9.2............ Subscriber Permanent Identifier.............................................................................................................................. 73

5.9.3............ Permanent Equipment Identifier.............................................................................................................................. 73

5.9.4............ 5G Globally Unique Temporary Identity............................................................................................................... 73

5.10........ Security aspects................................................................................................................................................................. 74

5.10.1.......... General......................................................................................................................................................................... 74

5.10.2.......... Security Model for non-3GPP access..................................................................................................................... 74

5.10.2.1............ Signalling Security............................................................................................................................................... 74

5.11........ Support for Dual connectivity, Multi-connectivity..................................................................................................... 74

5.12........ Charging............................................................................................................................................................................. 74

5.13........ Support for Edge Computing.......................................................................................................................................... 75

5.14........ Policy Control.................................................................................................................................................................... 75

5.15........ Network slicing................................................................................................................................................................. 75

5.15.1.......... General......................................................................................................................................................................... 75

5.15.2.......... Identification and selection of a Network Slice: The S-NSSAI and the NSSAI............................................. 76

5.15.2.1............ General................................................................................................................................................................... 76

5.15.2.2............ Standardised SST values..................................................................................................................................... 77

5.15.3.......... Subscription aspects................................................................................................................................................... 77

5.15.4.......... UE NSSAI configuration and NSSAI storage aspects......................................................................................... 77

5.15.5.......... Detailed Operation Overview................................................................................................................................... 78

5.15.5.1............ General................................................................................................................................................................... 78

5.15.5.2............ Selection of a Serving AMF supporting the Network Slices........................................................................ 78

5.15.5.2.1.............. Registration to a Set of Network Slices...................................................................................................... 78

5.15.5.2.2.............. Modification of the Set of Network Slice(s) for a UE............................................................................. 79

5.15.5.2.3.............. AMF Relocation due to Network Slice(s) Support.................................................................................. 80

5.15.5.3............ Establishing connectivity PDU session to the required Network Slice Instance(s)................................. 80

5.15.5.4............ Slice Privacy Considerations.............................................................................................................................. 80

5.15.6.......... Network Slicing Support for Roaming................................................................................................................... 80

5.16........ Support for specific services........................................................................................................................................... 81

5.16.1.......... Public Warning System............................................................................................................................................. 81

5.16.2.......... SMS over NAS........................................................................................................................................................... 81

5.16.2.1............ General................................................................................................................................................................... 81

5.16.2.2............ SMS over NAS transport.................................................................................................................................... 81

5.16.3.......... IMS support................................................................................................................................................................. 81

5.16.3.1............ General................................................................................................................................................................... 81

5.16.3.2............ IMS voice over PS Session Supported Indication.......................................................................................... 82

5.16.3.3............ Homogenous support for IMS voice over PS Session supported indication............................................. 82

5.16.3.4............ P-CSCF address delivery.................................................................................................................................... 82

5.16.3.5............ Domain selection for UE originating sessions / calls.................................................................................... 82

5.16.4.......... Emergency services.................................................................................................................................................... 83

5.16.5.......... Multimedia Priority Services.................................................................................................................................... 83

5.17........ Interworking and Migration............................................................................................................................................ 84

5.17.1.......... Support for Migration from EPC to 5GC............................................................................................................... 84

5.17.1.1............ General................................................................................................................................................................... 84

5.17.2.......... Interworking with EPC.............................................................................................................................................. 86

5.17.2.1............ General................................................................................................................................................................... 86

5.17.2.2............ Mobility in single-registration mode................................................................................................................ 86

5.17.2.3............ Mobility in dual-registration mode................................................................................................................... 87

5.18........ Network Sharing............................................................................................................................................................... 87

5.18.1.......... General concepts......................................................................................................................................................... 87

5.19........ Control Plane Congestion and Overload Control........................................................................................................ 87

5.20........ External Exposure of Network Capability.................................................................................................................... 87

5.21........ Architectural support for virtualized deployments..................................................................................................... 88

5.21.1.......... Architectural support for N2..................................................................................................................................... 88

5.21.1.1............ TNL associations.................................................................................................................................................. 88

5.21.1.2............ N2AP UE-TNLA-binding.................................................................................................................................. 88

6....... Network Functions...................................................................................................................... 89

6.1......... General................................................................................................................................................................................ 89

6.2......... Network Function Functional description.................................................................................................................... 89

6.2.1............ AMF.............................................................................................................................................................................. 89

6.2.2............ SMF.............................................................................................................................................................................. 90

6.2.3............ UPF............................................................................................................................................................................... 91

6.2.4............ PCF............................................................................................................................................................................... 91

6.2.5............ NEF............................................................................................................................................................................... 91

6.2.6............ NRF............................................................................................................................................................................... 92

6.2.7............ UDM............................................................................................................................................................................. 92

6.2.8............ AUSF............................................................................................................................................................................ 93

6.2.9............ N3IWF.......................................................................................................................................................................... 93

6.2.10.......... AF.................................................................................................................................................................................. 93

6.2.11.......... SDSF............................................................................................................................................................................. 94

6.2.12.......... UDSF............................................................................................................................................................................ 94

6.2.13.......... SMSF............................................................................................................................................................................ 94

6.3......... Principles for Network function and Network Function Service discovery and selection.................................. 94

6.3.1............ General......................................................................................................................................................................... 94

6.3.2............ SMF selection function.............................................................................................................................................. 95

6.3.3............ User Plane Function Selection................................................................................................................................. 96

6.3.4............ AUSF selection function........................................................................................................................................... 96

6.3.5............ AMF selection............................................................................................................................................................. 97

6.3.6............ N3IWF selection function......................................................................................................................................... 98

6.3.7............ PCF selection.............................................................................................................................................................. 98

6.3.7.1.............. PCF selection for an UE or a PDU session...................................................................................................... 98

6.3.7.2.............. Providing policy requirements that apply to multiple UE and hence to multiple PCF............................ 98

6.3.7.3.............. Binding an AF request targeting an IP address to the relevant PCF........................................................... 98

6.3.x....... <NF name> selection....................................................................................................................................................... 99

7....... Network Function Services and descriptions................................................................................. 99

7.1......... Network Function Service Framework......................................................................................................................... 99

7.1.1....... General................................................................................................................................................................................ 99

7.1.2....... NF Consumer-NF Producer interactions...................................................................................................................... 99

7.1.3............ Network Function Service discovery.................................................................................................................... 100

7.1.4............ Network Function Service Authorization............................................................................................................ 100

7.1.5............ Network Function Service registration and de-registration.............................................................................. 100

7.2......... Network Function Services........................................................................................................................................... 100

7.2.1............ General....................................................................................................................................................................... 100

7.2.2............ AMF Services........................................................................................................................................................... 102

7.2.3............ SMF Services............................................................................................................................................................ 102

7.2.4............ PCF Services............................................................................................................................................................. 102

7.2.5............ UDM Services.......................................................................................................................................................... 102

7.2.6............ NRF Services............................................................................................................................................................ 103

7.2.7............ AUSF Services......................................................................................................................................................... 103

7.2.8............ NEF Services............................................................................................................................................................ 103

7.2.9............ SMSF Services......................................................................................................................................................... 103

7.3......... Network Internal Exposure........................................................................................................................................... 104

7.4......... External Exposure.......................................................................................................................................................... 104

8....... Control and User plane Protocol Stacks...................................................................................... 104

8.1......... General............................................................................................................................................................................. 104

8.2......... Control plane Protocol stacks....................................................................................................................................... 104

8.2.1............ Control Plane between the AN and the 5G Core: N2........................................................................................ 104

8.2.1.1.............. General................................................................................................................................................................. 104

8.2.1.2.............. Control Plane Interface between the AN and the 5G Core......................................................................... 105

8.2.2............ Control Plane for untrusted non 3GPP Access................................................................................................... 105

8.3......... User Plane Protocol stacks............................................................................................................................................ 106

8.3.1............ User Plane Protocol stack for a PDU session...................................................................................................... 106

8.3.2............ User Plane for untrusted non 3GPP Access......................................................................................................... 108

TS 23.501.doc