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3GPP TS 23.501 V16.3.0 (2019-12)

Technical Specification

3rd Generation Partnership Project;

Technical Specification Group Services and System Aspects;

System architecture for the 5G System (5GS);

Stage 2

(Release 16)

The present document has been developed within the 3rd Generation Partnership Project (3GPP

) and may be further elaborated for the purposes of 3GPP.

The present document has not been subject to any approval process by the 3GPP Organizational Partners and shall not be implemented.

This Specification is provided for future development work within 3GPP only. The Organizational Partners accept no liability for any use of this Specification.

Specifications and Reports for implementation of the 3GPP

system should be obtained via the 3GPP Organizational Partners' Publications Offices.

3GPP

3GPP TS 23.501 V16.3.0 (2019-12)

Release 16

Contents

Foreword........................................................................................................................................................... 16

1 Scope.......................................................................................................................................................17

2 References...............................................................................................................................................17

3 Definitions and abbreviations................................................................................................................. 21

3.1 Definitions......................................................................................................................................................... 21

3.2 Abbreviations.....................................................................................................................................................26

4 Architecture model and concepts............................................................................................................28

4.1 General concepts................................................................................................................................................28

4.2 Architecture reference model............................................................................................................................ 29

4.2.1 General......................................................................................................................................................... 29

4.2.2 Network Functions and entities....................................................................................................................29

4.2.3 Non-roaming reference architecture............................................................................................................ 30

4.2.4 Roaming reference architectures..................................................................................................................33

4.2.5 Data Storage architectures........................................................................................................................... 37

4.2.5a Radio Capabilities Signalling optimisation..................................................................................................38

4.2.6 Service-based interfaces...............................................................................................................................39

4.2.7 Reference points...........................................................................................................................................40

4.2.8 Support of non-3GPP access........................................................................................................................42

4.2.8.0 General................................................................................................................................................... 42

4.2.8.1 General Concepts to Support Trusted and Untrusted Non-3GPP Access.............................................. 42

4.2.8.1A General Concepts to Support Wireline Access...................................................................................... 43

4.2.8.2 Architecture Reference Model for Trusted and Untrusted Non-3GPP Accesses...................................44

4.2.8.2.1 Non-roaming Architecture................................................................................................................44

4.2.8.2.2 LBO Roaming Architecture..............................................................................................................45

4.2.8.2.3 Home-routed Roaming Architecture................................................................................................ 47

4.2.8.3 Reference Points for Trusted and Untrusted Non-3GPP Access........................................................... 49

4.2.8.3.1 Overview...........................................................................................................................................49

4.2.8.3.2 Requirements on Ta..........................................................................................................................50

4.2.8.4 Architecture Reference Model for Wireline Access network................................................................ 50

4.2.8.5 Access to 5GC from devices that do not support 5GC NAS over WLAN access................................. 51

4.2.8.5.1 General..............................................................................................................................................51

4.2.8.5.2 Reference Architecture..................................................................................................................... 51

4.2.8.5.3 Network Functions............................................................................................................................52

4.2.8.5.4 Reference Points............................................................................................................................... 52

4.2.9 Network Analytics architecture................................................................................................................... 52

4.2.10 Architecture Reference Model for ATSSS Support.....................................................................................53

4.3 Interworking with EPC...................................................................................................................................... 54

4.3.1 Non-roaming architecture............................................................................................................................ 54

4.3.2 Roaming architecture................................................................................................................................... 55

4.3.3 Interworking between 5GC via non-3GPP access and E-UTRAN connected to EPC................................ 57

4.3.3.1 Non-roaming architecture.......................................................................................................................57

4.3.3.2 Roaming architecture............................................................................................................................. 58

4.3.4 Interworking between ePDG connected to EPC and 5GS........................................................................... 60

4.3.4.1 Non-roaming architecture.......................................................................................................................60

4.3.4.2 Roaming architectures............................................................................................................................61

4.3.5 Service Exposure in Interworking Scenarios............................................................................................... 63

4.3.5.1 Non-roaming architecture.......................................................................................................................63

4.3.5.2 Roaming architectures............................................................................................................................64

4.4 Specific services................................................................................................................................................ 65

4.4.1 Public Warning System................................................................................................................................65

4.4.2 SMS over NAS.............................................................................................................................................65

4.4.2.1 Architecture to support SMS over NAS.................................................................................................65

4.4.2.2 Reference point to support SMS over NAS........................................................................................... 67

4.4.2.3 Service based interface to support SMS over NAS................................................................................67

4.4.3 IMS support..................................................................................................................................................67

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Release 16

4.4.4 Location services..........................................................................................................................................67

4.4.4.1 Architecture to support Location Services............................................................................................. 67

4.4.4.2 Reference point to support Location Services........................................................................................67

4.4.4.3 Service Based Interfaces to support Location Services..........................................................................67

4.4.5 Application Triggering Services.................................................................................................................. 68

4.4.6 5G LAN-type Services.................................................................................................................................68

4.4.6.1 User plane architecture to support 5G LAN-type service...................................................................... 68

4.4.6.2 Reference points to support 5G LAN-type service................................................................................ 68

4.4.7 MSISDN-less MO SMS Service..................................................................................................................68

4.4.8 Time Sensitive Communication...................................................................................................................69

4.4.8.1 General................................................................................................................................................... 69

4.4.8.2 Architecture to support Time Sensitive Communication....................................................................... 69

5 High level features.................................................................................................................................. 70

5.1 General...............................................................................................................................................................70

5.2 Network Access Control....................................................................................................................................70

5.2.1 General......................................................................................................................................................... 70

5.2.2 Network selection........................................................................................................................................ 70

5.2.3 Identification and authentication..................................................................................................................71

5.2.4 Authorisation................................................................................................................................................71

5.2.5 Access control and barring...........................................................................................................................71

5.2.6 Policy control............................................................................................................................................... 72

5.2.7 Lawful Interception......................................................................................................................................72

5.3 Registration and Connection Management........................................................................................................72

5.3.1 General......................................................................................................................................................... 72

5.3.2 Registration Management............................................................................................................................ 72

5.3.2.1 General................................................................................................................................................... 72

5.3.2.2 5GS Registration Management states.....................................................................................................72

5.3.2.2.1 General..............................................................................................................................................72

5.3.2.2.2 RM-DEREGISTERED state.............................................................................................................72

5.3.2.2.3 RM-REGISTERED state.................................................................................................................. 73

5.3.2.2.4 5GS Registration Management State models................................................................................... 73

5.3.2.3 Registration Area management.............................................................................................................. 74

5.3.2.4 Support of a UE registered over both 3GPP and Non-3GPP access...................................................... 74

5.3.3 Connection Management............................................................................................................................. 76

5.3.3.1 General................................................................................................................................................... 76

5.3.3.2 5GS Connection Management states......................................................................................................76

5.3.3.2.1 General..............................................................................................................................................76

5.3.3.2.2 CM-IDLE state................................................................................................................................. 76

5.3.3.2.3 CM-CONNECTED state.................................................................................................................. 77

5.3.3.2.4 5GS Connection Management State models.................................................................................... 78

5.3.3.2.5 CM-CONNECTED with RRC Inactive state................................................................................... 78

5.3.3.3 NAS signalling connection management............................................................................................... 80

5.3.3.3.1 General..............................................................................................................................................80

5.3.3.3.2 NAS signalling connection establishment........................................................................................ 80

5.3.3.3.3 NAS signalling connection Release..................................................................................................80

5.3.3.4 Support of a UE connected over both 3GPP and Non-3GPP access......................................................81

5.3.4 UE Mobility................................................................................................................................................. 81

5.3.4.1 Mobility Restrictions..............................................................................................................................81

5.3.4.1.1 General..............................................................................................................................................81

5.3.4.1.2 Management of Service Area Restrictions....................................................................................... 83

5.3.4.2 Mobility Pattern......................................................................................................................................84

5.3.4.3 Radio Resource Management functions.................................................................................................84

5.3.4.4 UE mobility event notification............................................................................................................... 85

5.4 3GPP access specific aspects.............................................................................................................................86

5.4.1 UE reachability in CM-IDLE.......................................................................................................................86

5.4.1.1 General................................................................................................................................................... 86

5.4.1.2 UE reachability allowing mobile terminated data while the UE is CM-IDLE...................................... 87

5.4.1.3 Mobile Initiated Connection Only (MICO) mode..................................................................................87

5.4.2 UE reachability in CM-CONNECTED........................................................................................................88

5.4.3 Paging strategy handling..............................................................................................................................88

5.4.3.1 General................................................................................................................................................... 88

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Release 16

5.4.3.2 Paging Policy Differentiation.................................................................................................................88

5.4.3.3 Paging Priority........................................................................................................................................89

5.4.4 UE Radio Capability handling..................................................................................................................... 89

5.4.4.1 UE radio capability information storage in the AMF.............................................................................89

5.4.4.1a UE radio capability signalling optimisation (RACS).............................................................................90

5.4.4.2 Void........................................................................................................................................................ 93

5.4.4.2a UE Radio Capability Match Request..................................................................................................... 93

5.4.4.3 Paging assistance information................................................................................................................ 93

5.4.4a UE MM Core Network Capability handling................................................................................................93

5.4.4b UE 5GSM Core Network Capability handling............................................................................................ 94

5.4.5 DRX (Discontinuous Reception) framework...............................................................................................94

5.4.6 Core Network assistance information for RAN optimization......................................................................95

5.4.6.1 General................................................................................................................................................... 95

5.4.6.2 Core Network assisted RAN parameters tuning.....................................................................................95

5.4.6.3 Core Network assisted RAN paging information...................................................................................96

5.4.7 NG-RAN location reporting.........................................................................................................................96

5.4.8 Support for identification and restriction of using unlicensed spectrum..................................................... 97

5.5 Non-3GPP access specific aspects.....................................................................................................................98

5.5.0 General......................................................................................................................................................... 98

5.5.1 Registration Management............................................................................................................................ 98

5.5.2 Connection Management............................................................................................................................. 98

5.5.3 UE Reachability........................................................................................................................................... 99

5.5.3.1 UE reachability in CM-IDLE................................................................................................................. 99

5.5.3.2 UE reachability in CM-CONNECTED................................................................................................100

5.6 Session Management....................................................................................................................................... 100

5.6.1 Overview....................................................................................................................................................100

5.6.2 Interaction between AMF and SMF...........................................................................................................103

5.6.3 Roaming..................................................................................................................................................... 105

5.6.4 Single PDU Session with multiple PDU Session Anchors........................................................................ 106

5.6.4.1 General................................................................................................................................................. 106

5.6.4.2 Usage of an UL Classifier for a PDU Session......................................................................................106

5.6.4.3 Usage of IPv6 multi-homing for a PDU Session................................................................................. 107

5.6.5 Support for Local Area Data Network.......................................................................................................109

5.6.6 Secondary authentication/authorization by a DN-AAA server during the establishment of a PDU

Session....................................................................................................................................................... 111

5.6.7 Application Function influence on traffic routing..................................................................................... 113

5.6.7.1 General................................................................................................................................................. 113

5.6.7.2 Enhancement of UP path management based on the coordination with AFs...................................... 118

5.6.8 Selective activation and deactivation of UP connection of existing PDU Session....................................119

5.6.9 Session and Service Continuity..................................................................................................................120

5.6.9.1 General................................................................................................................................................. 120

5.6.9.2 SSC mode.............................................................................................................................................120

5.6.9.2.1 SSC Mode 1....................................................................................................................................120

5.6.9.2.2 SSC Mode 2....................................................................................................................................121

5.6.9.2.3 SSC Mode 3....................................................................................................................................121

5.6.9.3 SSC mode selection..............................................................................................................................121

5.6.10 Specific aspects of different PDU Session types....................................................................................... 122

5.6.10.1 Support of IP PDU Session type.......................................................................................................... 122

5.6.10.2 Support of Ethernet PDU Session type................................................................................................ 122

5.6.10.3 Support of Unstructured PDU Session type......................................................................................... 124

5.6.11 UE presence in Area of Interest reporting usage by SMF......................................................................... 125

5.6.12 Use of Network Instance............................................................................................................................126

5.6.13 Always-on PDU session.............................................................................................................................126

5.6.14 Support of Framed Routing........................................................................................................................127

5.7 QoS model....................................................................................................................................................... 127

5.7.1 General Overview...................................................................................................................................... 127

5.7.1.1 QoS Flow..............................................................................................................................................127

5.7.1.2 QoS Profile...........................................................................................................................................128

5.7.1.2a Alternative QoS Profile........................................................................................................................129

5.7.1.3 Control of QoS Flows.......................................................................................................................... 129

5.7.1.4 QoS Rules.............................................................................................................................................129

5.7.1.5 QoS Flow mapping...............................................................................................................................130

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