ETSI TS 123 502 V16.5.0 (2020-07)

5G; Procedures for the 5G System (5GS) (3GPP TS 23.502 version 16.5.0 Release 16)

RTS/TSGS-0223502vg50

General Information

• Status: Not Published
• Technical Committee: 3GPP SA 2 - Architecture
• Current Stage: 50 - Withdrawn
• Completion Date: 21-Sep-2020

Standards Content (Sample)

ETSI TS 123 502 V16.5.0 (2020-07)






TECHNICAL SPECIFICATION
5G;
Procedures for the 5G System (5GS)
(3GPP TS 23.502 version 16.5.0 Release 16)

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3GPP TS 23.502 version 16.5.0 Release 16 1 ETSI TS 123 502 V16.5.0 (2020-07)



Reference
RTS/TSGS-0223502vg50
Keywords
5G
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3GPP TS 23.502 version 16.5.0 Release 16 2 ETSI TS 123 502 V16.5.0 (2020-07)
Intellectual Property Rights
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ETSI

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3GPP TS 23.502 version 16.5.0 Release 16 3 ETSI TS 123 502 V16.5.0 (2020-07)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 19
1 Scope . 20
2 References . 20
3 Definitions, symbols and abbreviations . 22
3.1 Definitions . 22
3.2 Abbreviations . 23
4 System procedures . 23
4.1 General . 23
4.2 Connection, Registration and Mobility Management procedures . 23
4.2.1 General . 23
4.2.2 Registration Management procedures . 23
4.2.2.1 General . 23
4.2.2.2 Registration procedures . 23
4.2.2.2.1 General . 23
4.2.2.2.2 General Registration . 25
4.2.2.2.3 Registration with AMF re-allocation . 40
4.2.2.3 Deregistration procedures . 43
4.2.2.3.1 General . 43
4.2.2.3.2 UE-initiated Deregistration . 43
4.2.2.3.3 Network-initiated Deregistration . 45
4.2.3 Service Request procedures . 46
4.2.3.1 General . 46
4.2.3.2 UE Triggered Service Request . 46
4.2.3.3 Network Triggered Service Request . 58
4.2.4 UE Configuration Update . 65
4.2.4.1 General . 65
4.2.4.2 UE Configuration Update procedure for access and mobility management related parameters . 65
4.2.4.3 UE Configuration Update procedure for transparent UE Policy delivery . 69
4.2.5 Reachability procedures . 70
4.2.5.1 General . 70
4.2.5.2 UE Reachability Notification Request procedure . 70
4.2.5.3 UE Activity Notification procedure . 72
4.2.6 AN Release . 73
4.2.7 N2 procedures . 75
4.2.7.1 N2 Configuration . 75
4.2.7.2 NGAP UE-TNLA-binding related procedures . 76
4.2.7.2.1 Creating NGAP UE-TNLA-bindings during Registration and Service Request . 76
4.2.7.2.2 Creating NGAP UE-TNLA-bindings during handovers . 76
4.2.7.2.3 Re-Creating NGAP UE-TNLA-bindings subsequent to NGAP UE-TNLA-binding release . 77
4.2.7.2.4 NGAP UE-TNLA-binding update procedure . 77
4.2.7.2.5 NGAP UE-TNLA-binding per UE Release procedure . 77
4.2.7.3 AMF Failure or Planned Maintenance handling procedure . 78
4.2.8 Void . 78
4.2.8a UE Capability Match Request procedure . 78
4.2.9 Network Slice-Specific Authentication and Authorization procedure . 79
4.2.9.1 General . 79
4.2.9.2 Network Slice-Specific Authentication and Authorization . 80
4.2.9.3 AAA Server triggered Network Slice-Specific Re-authentication and Re-authorization procedure . 82
4.2.9.4 AAA Server triggered Slice-Specific Authorization Revocation . 83
4.2.10 N3 data transfer establishment procedure when Control Plane CIoT 5GS Optimisation is enabled . 83
4.2.10.1 UE triggered N3 data transfer establishment procedure . 83
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3GPP TS 23.502 version 16.5.0 Release 16 4 ETSI TS 123 502 V16.5.0 (2020-07)
4.2.10.2 SMF triggered N3 data transfer establishment procedure . 84
4.3 Session Management procedures . 85
4.3.1 General . 85
4.3.2 PDU Session Establishment . 86
4.3.2.1 General . 86
4.3.2.2 UE Requested PDU Session Establishment . 86
4.3.2.2.1 Non-roaming and Roaming with Local Breakout . 86
4.3.2.2.2 Home-routed Roaming . 98
4.3.2.2.3 SMF selection . 102
4.3.2.2.4 Multiple PDU Sessions towards the same DNN and S-NSSAI . 105
4.3.2.3 Secondary authorization/authentication by an DN-AAA server during the PDU Session
establishment . 106
4.3.3 PDU Session Modification . 108
4.3.3.1 General . 108
4.3.3.2 UE or network requested PDU Session Modification (non-roaming and roaming with local
breakout) . 108
4.3.3.3 UE or network requested PDU Session Modification (home-routed roaming) . 114
4.3.4 PDU Session Release . 117
4.3.4.1 General . 117
4.3.4.2 UE or network requested PDU Session Release for Non-Roaming and Roaming with Local

Breakout . 117
4.3.4.3 UE or network requested PDU Session Release for Home-routed Roaming . 122
4.3.5 Session continuity, service continuity and UP path management . 124
4.3.5.1 Change of SSC mode 2 PDU Session Anchor with different PDU Sessions . 124
4.3.5.2 Change of SSC mode 3 PDU Session Anchor with multiple PDU Sessions . 124
4.3.5.3 Change of SSC mode 3 PDU Session Anchor with IPv6 Multi-homed PDU Session . 126
4.3.5.4 Addition of additional PDU Session Anchor and Branching Point or UL CL . 129
4.3.5.5 Removal of additional PDU Session Anchor and Branching Point or UL CL . 130
4.3.5.6 Change of additional PDU Session Anchor for IPv6 multi-homing or UL CL . 132
4.3.5.7 Simultaneous change of Branching Point or UL CL and additional PSA for a PDU Session. 133
4.3.5.8 Ethernet PDU Session Anchor Relocation . 136
4.3.6 Application Function influence on traffic routing . 138
4.3.6.1 General . 138
4.3.6.2 Processing AF requests to influence traffic routing for Sessions not identified by an UE address . 140
4.3.6.3 Notification of User Plane Management Events . 141
4.3.6.4 Transferring an AF request targeting an individual UE address to the relevant PCF. 144
4.3.7 CN-initiated selective deactivation of UP connection of an existing PDU Session . 145
4.4 SMF and UPF interactions . 146
4.4.1 N4 session management procedures . 146
4.4.1.1 General . 146
4.4.1.2 N4 Session Establishment procedure . 147
4.4.1.3 N4 Session Modification procedure . 147
4.4.1.4 N4 Session Release procedure . 148
4.4.2 N4 Reporting Procedures . 148
4.4.2.1 General . 148
4.4.2.2 N4 Session Level Reporting Procedure . 148
4.4.3 N4 Node Level Procedures . 150
4.4.3.1 N4 Association Setup Procedure . 150
4.4.3.2 N4 Association Update Procedure . 151
4.4.3.3 N4 Association Release Procedure . 151
4.4.3.4 N4 Report Procedure . 152
4.4.3.5 N4 PFD management Procedure . 152
4.4.4 SMF Pause of Charging procedure . 153
4.5 User Profile management procedures . 154
4.5.1 Subscriber Data Update Notification to AMF . 154
4.5.2 Session Management Subscriber Data Update Notification to SMF . 155
4.5.3 Purge of subscriber data in AMF . 155
4.6 Security procedures . 156
4.7 ME Identity check procedure . 156
4.8 RAN-CN interactions . 156
4.8.1 Connection Inactive and Suspend procedure . 156
4.8.1.1 Connection Inactive procedure . 156
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3GPP TS 23.502 version 16.5.0 Release 16 5 ETSI TS 123 502 V16.5.0 (2020-07)
4.8.1.2 Connection Suspend procedure . 156
4.8.2 Connection Resume procedure . 158
4.8.2.1 General . 158
4.8.2.2 Connection Resume in RRC Inactive procedure . 158
4.8.2.3 Connection Resume in CM-IDLE with Suspend procedure . 159
4.8.2.4 Connection Resume in CM-IDLE with Suspend and MO EDT procedure . 160
4.8.3 N2 Notification procedure . 162
4.9 Handover procedures . 163
4.9.1 Handover procedures in 3GPP access . 163
4.9.1.1 General . 163
4.9.1.2 Xn based inter NG-RAN handover . 163
4.9.1.2.1 General . 163
4.9.1.2.2 Xn based inter NG-RAN handover without User Plane function re-allocation . 163
4.9.1.2.3 Xn based inter NG-RAN handover with insertion of intermediate UPF . 167
4.9.1.2.4 Xn based inter NG-RAN handover with re-allocation of intermediate UPF . 169
4.9.1.3 Inter NG-RAN node N2 based handover . 170
4.9.1.3.1 General . 170
4.9.1.3.2 Preparation phase. 172
4.9.1.3.3 Execution phase . 178
4.9.1.3.3a Execution phase for DAPS handover . 181
4.9.1.4 Inter NG-RAN node N2 based handover, Cancel . 183
4.9.2 Handover of a PDU Session procedure between 3GPP and untrusted non-3GPP access . 183
4.9.2.0 General . 183
4.9.2.1 Handover of a PDU Session procedure from untrusted non-3GPP to 3GPP access (non-roaming
and roaming with local breakout) . 183
4.9.2.2 Handover of a PDU Session procedure from 3GPP to untrusted non-3GPP access (non-roaming

and roaming with local breakout) . 184
4.9.2.3 Handover of a PDU Session procedure from untrusted non-3GPP to 3GPP access (home routed
roaming) . 185
4.9.2.3.1 The target AMF is in the PLMN of the N3IWF . 185
4.9.2.3.2 The target AMF is not in the PLMN of the N3IWF (i.e. N3IWF in HPLMN) . 185
4.9.2.4 Handover of a PDU Session procedure from 3GPP to untrusted non-3GPP access (home routed

roaming) . 186
4.9.2.4.1 The selected N3IWF is in the registered PLMN . 186
4.9.2.4.2 The UE is roaming and the selected N3IWF is in the home PLMN . 186
4.9.3 Handover of a PDU Session procedure between 3GPP and trusted non-3GPP access . 187
4.9.3.0 General . 187
4.10 NG-RAN Location reporting procedures . 187
4.11 System interworking procedures with EPC . 189
4.11.0 General . 189
4.11.0a Impacts to EPS Procedures . 189
4.11.0a.1 General . 189
4.11.0a.2 Interaction with PCC . 189
4.11.0a.3 Mobility Restrictions . 190
4.11.0a.4 PGW Selection . 190
4.11.0a.5 PDN Connection Establishment . 190
4.11.0a.6 Network Configuration . 191
4.11.1 N26 based Interworking Procedures . 191
4.11.1.1 General . 191
4.11.1.2 Handover procedures . 193
4.11.1.2.1 5GS to EPS handover using N26 interface . 193
4.11.1.2.2 EPS to 5GS handover using N26 interface . 198
4.11.1.2.3 Handover Cancel . 204
4.11.1.3 Idle Mode Mobility procedures . 205
4.11.1.3.1 General .
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