ETSI TS 123 501 V16.20.0 (2024-07)

5G; System architecture for the 5G System (5GS) (3GPP TS 23.501 version 16.20.0 Release 16)

RTS/TSGS-0223501vgk0

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 2 - Architecture
• Current Stage: 12 - Citation in the OJ (auto-insert)
• Completion Date: 25-Jul-2024

Standards Content (Sample)

TECHNICAL SPECIFICATION
5G;
System architecture for the 5G System (5GS)
(3GPP TS 23.501 version 16.20.0 Release 16)

3GPP TS 23.501 version 16.20.0 Release 16 1 ETSI TS 123 501 V16.20.0 (2024-07)

Reference
RTS/TSGS-0223501vgk0
Keywords
5G
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ETSI
3GPP TS 23.501 version 16.20.0 Release 16 2 ETSI TS 123 501 V16.20.0 (2024-07)
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ETSI
3GPP TS 23.501 version 16.20.0 Release 16 3 ETSI TS 123 501 V16.20.0 (2024-07)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 16
1 Scope . 17
2 References . 17
3 Definitions and abbreviations . 22
3.1 Definitions . 22
3.2 Abbreviations . 26
4 Architecture model and concepts . 29
4.1 General concepts . 29
4.2 Architecture reference model . 29
4.2.1 General . 29
4.2.2 Network Functions and entities . 30
4.2.3 Non-roaming reference architecture . 31
4.2.4 Roaming reference architectures . 34
4.2.5 Data Storage architectures . 38
4.2.5a Radio Capabilities Signalling optimisatio n . 39
4.2.6 Service-based interfaces . 40
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 . 44
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 . 48
4.2.8.3 Reference Points for Non-3GPP Access . 50
4.2.8.3.1 Overview . 50
4.2.8.3.2 Requirements on Ta . 50
4.2.8.4 Architecture Reference Model for Wireline Access network. 51
4.2.8.5 Access to 5GC from devices that do not support 5GC NAS over WLAN access . 52
4.2.8.5.1 General . 52
4.2.8.5.2 Reference Architecture . 53
4.2.8.5.3 Network Functions . 53
4.2.8.5.4 Reference Points . 53
4.2.9 Network Analytics architecture . 54
4.2.10 Architecture Reference Model for ATSSS Support . 54
4.3 Interworking with EPC . 55
4.3.1 Non-roaming architecture . 55
4.3.2 Roaming architecture . 56
4.3.3 Interworking between 5GC via non-3GPP access and E-UTRAN connected to EPC . 58
4.3.3.1 Non-roaming architecture . 58
4.3.3.2 Roaming architecture . 59
4.3.4 Interworking between ePDG connected to EPC and 5GS . 61
4.3.4.1 Non-roaming architecture . 61
4.3.4.2 Roaming architectures . 62
4.3.5 Service Exposure in Interworking Scenarios . 64
4.3.5.1 Non-roaming architecture . 64
4.3.5.2 Roaming architectures . 65
4.4 Specific services . 66
4.4.1 Public Warning System . 66
4.4.2 SMS over NAS . 66
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4.4.2.1 Architecture to support SMS over NAS . 66
4.4.2.2 Reference point to support SMS over NAS . 68
4.4.2.3 Service based interface to support SMS over NAS . 68
4.4.3 IMS support . 68
4.4.4 Location services . 68
4.4.4.1 Architecture to support Location Services . 68
4.4.4.2 Reference point to support Location Services . 68
4.4.4.3 Service Based Interfaces to support Location Services . 68
4.4.5 Application Triggering Services . 69
4.4.6 5G LAN-type Services . 69
4.4.6.1 User plane architecture to support 5G LAN-type service . 69
4.4.6.2 Reference points to support 5G LAN-type service . 69
4.4.7 MSISDN-less MO SMS Service . 69
4.4.8 Time Sensitive Communication . 70
4.4.8.1 General . 70
4.4.8.2 Architecture to support Time Sensitive Communication . 70
5 High level features. 71
5.1 General . 71
5.2 Network Access Control . 71
5.2.1 General . 71
5.2.2 Network selection . 72
5.2.3 Identification and authentication . 72
5.2.4 Authorisation . 72
5.2.5 Access control and barring . 72
5.2.6 Policy control . 73
5.2.7 Lawful Interception. 73
5.3 Registration and Connection Management . 73
5.3.1 General . 73
5.3.2 Registration Management . 73
5.3.2.1 General . 73
5.3.2.2 5GS Registration Management states. 73
5.3.2.2.1 General . 73
5.3.2.2.2 RM-DEREGISTERED state . 73
5.3.2.2.3 RM-REGISTERED state . 74
5.3.2.2.4 5GS Registration Management State models . 75
5.3.2.3 Registration Area management . 75
5.3.2.4 Support of a UE registered over both 3GPP and Non-3GPP access . 76
5.3.3 Connection Management . 78
5.3.3.1 General . 78
5.3.3.2 5GS Connection Management states . 78
5.3.3.2.1 General . 78
5.3.3.2.2 CM-IDLE state . 78
5.3.3.2.3 CM-CONNECTED state . 79
5.3.3.2.4 5GS Connection Management State models . 79
5.3.3.2.5 CM-CONNECTED with RRC Inactive state . 80
5.3.3.3 NAS signalling connection management . 82
5.3.3.3.1 General . 82
5.3.3.3.2 NAS signalling connection establishment . 82
5.3.3.3.3 NAS signalling connection Release. 82
5.3.3.4 Support of a UE connected over both 3GPP and Non-3GPP access . 82
5.3.4 UE Mobility . 83
5.3.4.1 Mobility Restrictions . 83
5.3.4.1.1 General . 83
5.3.4.1.2 Management of Service Area Restrictions . 85
5.3.4.2 Mobility Pattern . 86
5.3.4.3 Radio Resource Management functions . 86
5.3.4.4 UE mobility event notification . 87
5.4 3GPP access specific aspects. 88
5.4.1 UE reachability in CM-IDLE. 88
5.4.1.1 General . 88
5.4.1.2 UE reachability allowing mobile terminated data while the UE is CM-IDLE . 89
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5.4.1.3 Mobile Initiated Connection Only (MICO) mode . 89
5.4.2 UE reachability in CM-CONNECTED. 90
5.4.3 Paging strategy handling . 90
5.4.3.1 General . 90
5.4.3.2 Paging Policy Differentiation . 91
5.4.3.3 Paging Priority . 91
5.4.4 UE Radio Capability handling . 92
5.4.4.1 UE radio capability information storage in the AMF . 92
5.4.4.1a UE radio capability signalling optimisation (RACS) . 93
5.4.4.2 Void. 96
5.4.4.2a UE Radio Capability Match Request . 96
5.4.4.3 Paging assistance information . 97
5.4.4a UE MM Core Network Capability handling . 97
5.4.4b UE 5GSM Core Network Capability handling . 98
5.4.5 DRX (Discontinuous Reception) framework . 98
5.4.6 Core Network assistance information for RAN optimization . 99
5.4.6.1 General . 99
5.4.6.2 Core Network assisted RAN parameters tuning . 99
5.4.6.3 Core Network assisted RAN paging information . 100
5.4.7 NG-RAN location reporting . 100
5.4.8 Support for identification and restriction of using unlicensed spectrum . 101
5.4.9 Wake Up Signal Assistance . 102
5.4.9.1 General . 102
5.4.9.2 Group Wake Up Signal . 102
5.5 Non-3GPP access specific aspects . 102
5.5.0 General . 102
5.5.1 Registration Management . 103
5.5.2 Connection Management . 103
5.5.3 UE Reachability . 104
5.5.3.1 UE reachability in CM-IDLE . 104
5.5.3.2 UE reachability in CM-CONNECTED . 105
5.6 Session Management . 105
5.6.1 Overview . 105
5.6.2 Interaction between AMF and SMF . 108
5.6.3 Roaming . 110
5.6.4 Single PDU Session with multiple PDU Session Anchors . 111
5.6.4.1 General . 111
5.6.4.2 Usage of an UL Classifier for a PDU Session . 112
5.6.4.3 Usage of IPv6 multi-homing for a PDU Session. 113
5.6.5 Support for Local Area Data Network . 115
5.6.6 Secondary authentication/authorization by a DN-AAA server during the establishment of a PDU
Session . 117
5.6.7 Application Function influence on traffic routing . 118
5.6.7.1 General . 118
5.6.7.2 Enhancement of UP path management based on the coordination with AFs . 123
5.6.8 Selective activation and deactivation of UP connection of existing PDU Session . 124
5.6.9 Session and Service Continuity . 125
5.6.9.1 General . 125
5.6.9.2 SSC mode . 125
5.6.9.2.1 SSC Mode 1 . 125
5.6.9.2.2 SSC Mode 2 . 126
5.6.9.2.3 SSC Mode 3 . 126
5.6.9.3 SSC mode selection. 126
5.6.10 Specific aspects of different PDU Session types . 127
5.6.10.1 Support of IP PDU Session type . 127
5.6.10.2 Support of Ethernet PDU Session type . 128
5.6.10.3 Support of Unstructured PDU Session type . 129
5.6.10.4 Maximum Transfer Unit size considerations . 130
5.6.11 UE presence in Area of Interest reporting usage by SMF . 131
5.6.12 Use of Network Instance . 132
5.6.13 Always-on PDU session . 133
5.6.14 Support of Framed Routing . 133
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5.7 QoS model . 134
5.7.1 General Overview . 134
5.7.1.1 QoS Flow . 134
5.7.1.2 QoS Profile . 134
5.7.1.2a Alternative QoS Profile . 135
5.7.1.3 Control of QoS Flows . 135
5.7.1.4 QoS Rules . 135
5.7.1.5 QoS Flow mapping . 136
5.7.1.6 DL traffic. 138
5.7.1.7 UL Traffic . 138
5.7.1.8 AMBR/MFBR enforcement and rate limitation . 139
5.7.1.9 Precedence Value . 139
5.7.2 5G QoS Parameters . 139
5.7.2.1 5QI . 139
5.7.2.2 ARP . 140
5.7.2.3 RQA . 140
5.7.2.4 Notification control . 140
5.7.2.4.1 General . 140
5.7.2.4.1a Notification Control without Alternative QoS Profiles . 140
5.7.2.4.1b Notification control with Alternative QoS Profiles . 141
5.7.2.4.2 Usage of Notification control with Alternative QoS Profiles at handover . 142
5.7.2.4.3 Usage of Notification control with Alternative QoS Profiles during QoS Flow establishment
and modification . 143
5.7.2.5 Flow Bit Rates . 143
5.7.2.6 Aggregate Bit Rates . 143
5.7.2.7 Default values . 144
5.7.2.8 Maximum Packet Loss Rate . 144
5.7.2.9 Wireline access network specific 5G QoS parameters . 144
5.7.3 5G QoS characteristics . 145
5.7.3.1 General . 145
5.7.3.2 Resource Type . 145
5.7.3.3 Priority Level . 145
5.7.3.4 Packet Delay Budget . 146
5.7.3.5 Packet Error Rate . 147
5.7.3.6 Averaging Window . 147
5.7.3.7 Maximum Data Burst Volume . 147
5.7.4 Standardized 5QI to QoS characteristics mapping . 147
5.7.5 Reflective QoS . 151
5.7.5.1 General . 151
5.7.5.2 UE Derived QoS Rule . 152
5.7.5.3 Reflective QoS Control . 153
5.7.6 Packet Filter Set . 154
5.7.6.1 General . 154
5.7.6.2 IP Packet Filter Set . 154
5.7.6.3 Ethernet Packet Filter Set . 154
5.8 User Plane Management . 155
5.8.1 General . 155
5.8.2 Functional Description . 155
5.8.2.1 General . 155
5.8.2.2 UE IP Address Management . 155
5.8.2.2.1 General . 155
5.8.2.2.2 Routing rules configuration . 158
5.8.2.2.3 The procedure of Stateless IPv6 Address Autoconfiguration . 158
5.8.2.3 Management of CN Tunnel Info . 159
5.8.2.3.1 General . 159
5.8.2.3.2 Void . 159
5.8.2.3.3 Management of CN Tunnel Info in the UPF . 159
5.8.2.4 Traffic Detection . 159
5.8.2.4.1 General . 159
5.8.2.4.2 Traffic Detection Information . 159
5.8.2.5 Control of User Plane Forwarding . 160
5.8.2.5.1 General . 160
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5.8.2.5.2 Data forwarding between the SMF and UPF . 160
5.8.2.5.3 Support of Ethernet PDU Session type . 160
5.8.2.6 Charging and Usage Monitoring Handling . 161
5.8.2.6.1 General . 161
5.8.2.6.2 Activation of Usage Reporting in UPF . 162
5.8.2.6.3 Reporting of Usage Information towards SMF . 162
5.8.2.7 PDU Session and QoS Flow Policing . 163
5.8.2.8 PCC Related Functions . 163
5.8.2.8.1 Activation/Deactivation of predefined PCC rules . 163
5.8.2.8.2 Enforcement of Dynamic PCC
...