ETSI TS 123 502 V15.9.0 (2020-03)

5G; Procedures for the 5G System (5GS) (3GPP TS 23.502 version 15.9.0 Release 15)

RTS/TSGS-0223502vf90

General Information

• Status: Published
• Publication Date: 30-Mar-2020
• Technical Committee: 3GPP SA 2 - Architecture
• Current Stage: 12 - Completion
• Completion Date: 31-Mar-2020

Standards Content (Sample)

ETSI TS 123 502 V15.9.0 (2020-03)






TECHNICAL SPECIFICATION
5G;
Procedures for the 5G System (5GS)
(3GPP TS 23.502 version 15.9.0 Release 15)

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3GPP TS 23.502 version 15.9.0 Release 15 1 ETSI TS 123 502 V15.9.0 (2020-03)



Reference
RTS/TSGS-0223502vf90
Keywords
5G
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3GPP TS 23.502 version 15.9.0 Release 15 2 ETSI TS 123 502 V15.9.0 (2020-03)
Intellectual Property Rights
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ETSI

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3GPP TS 23.502 version 15.9.0 Release 15 3 ETSI TS 123 502 V15.9.0 (2020-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 13
1 Scope . 14
2 References . 14
3 Definitions, symbols and abbreviations . 16
3.1 Definitions . 16
3.2 Abbreviations . 16
4 System procedures . 16
4.1 General . 16
4.2 Connection, Registration and Mobility Management procedures . 16
4.2.1 General . 16
4.2.2 Registration Management procedures . 16
4.2.2.1 General . 16
4.2.2.2 Registration procedures . 16
4.2.2.2.1 General . 16
4.2.2.2.2 General Registration . 18
4.2.2.2.3 Registration with AMF re-allocation . 28
4.2.2.3 Deregistration procedures . 30
4.2.2.3.1 General . 30
4.2.2.3.2 UE-initiated Deregistration . 31
4.2.2.3.3 Network-initiated Deregistration . 32
4.2.3 Service Request procedures . 33
4.2.3.1 General . 33
4.2.3.2 UE Triggered Service Request . 33
4.2.3.3 Network Triggered Service Request . 42
4.2.4 UE Configuration Update . 49
4.2.4.1 General . 49
4.2.4.2 UE Configuration Update procedure for access and mobility management related parameters . 49
4.2.4.3 UE Configuration Update procedure for transparent UE Policy delivery . 52
4.2.5 Reachability procedures . 53
4.2.5.1 General . 53
4.2.5.2 UE Reachability Notification Request procedure . 54
4.2.5.3 UE Activity Notification procedure . 55
4.2.6 AN Release . 55
4.2.7 N2 procedures . 57
4.2.7.1 N2 Configuration . 57
4.2.7.2 NGAP UE-TNLA-binding related procedures . 58
4.2.7.2.1 Creating NGAP UE-TNLA-bindings during Registration and Service Request . 58
4.2.7.2.2 Creating NGAP UE-TNLA-bindings during handovers . 58
4.2.7.2.3 Re-Creating NGAP UE-TNLA-bindings subsequent to NGAP UE-TNLA-binding release . 59
4.2.7.2.4 NGAP UE-TNLA-binding update procedure . 59
4.2.7.2.5 NGAP UE-TNLA-binding per UE Release procedure . 60
4.2.7.3 AMF Failure or Planned Maintenance handling procedure . 60
4.2.8 Void . 60
4.2.8a UE Capability Match Request procedure . 60
4.3 Session Management procedures . 62
4.3.1 General . 62
4.3.2 PDU Session Establishment . 62
4.3.2.1 General . 62
4.3.2.2 UE Requested PDU Session Establishment . 63
4.3.2.2.1 Non-roaming and Roaming with Local Breakout . 63
4.3.2.2.2 Home-routed Roaming . 72
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3GPP TS 23.502 version 15.9.0 Release 15 4 ETSI TS 123 502 V15.9.0 (2020-03)
4.3.2.2.3 SMF selection . 76
4.3.2.3 Secondary authorization/authentication by an DN-AAA server during the PDU Session

establishment . 79
4.3.3 PDU Session Modification . 81
4.3.3.1 General . 81
4.3.3.2 UE or network requested PDU Session Modification (non-roaming and roaming with local
breakout) . 81
4.3.3.3 UE or network requested PDU Session Modification (home-routed roaming) . 85
4.3.4 PDU Session Release . 88
4.3.4.1 General . 88
4.3.4.2 UE or network requested PDU Session Release for Non-Roaming and Roaming with Local
Breakout . 88
4.3.4.3 UE or network requested PDU Session Release for Home-routed Roaming . 92
4.3.5 Session continuity, service continuity and UP path management . 94
4.3.5.1 Change of SSC mode 2 PDU Session Anchor with different PDU Sessions . 94
4.3.5.2 Change of SSC mode 3 PDU Session Anchor with multiple PDU Sessions . 95
4.3.5.3 Change of SSC mode 3 PDU Session Anchor with IPv6 Multi-homed PDU Session . 96
4.3.5.4 Addition of additional PDU Session Anchor and Branching Point or UL CL . 98
4.3.5.5 Removal of additional PDU Session Anchor and Branching Point or UL CL . 100
4.3.5.6 Change of additional PDU Session Anchor for IPv6 multi-homing or UL CL . 101
4.3.5.7 Simultaneous change of Branching Point or UL CL and additional PSA for a PDU Session. 103
4.3.6 Application Function influence on traffic routing . 105
4.3.6.1 General . 105
4.3.6.2 Processing AF requests to influence traffic routing for Sessions not identified by an UE address . 106
4.3.6.3 Notification of User Plane Management Events . 107
4.3.6.4 Transferring an AF request targeting an individual UE address to the relevant PCF. 109
4.3.7 CN-initiated selective deactivation of UP connection of an existing PDU Session . 110
4.4 SMF and UPF interactions . 111
4.4.1 N4 session management procedures . 111
4.4.1.1 General . 111
4.4.1.2 N4 Session Establishment procedure . 111
4.4.1.3 N4 Session Modification procedure . 112
4.4.1.4 N4 Session Release procedure . 113
4.4.2 N4 Reporting Procedures . 113
4.4.2.1 General . 113
4.4.2.2 N4 Session Level Reporting Procedure . 113
4.4.3 N4 Node Level Procedures . 114
4.4.3.1 N4 Association Setup Procedure . 114
4.4.3.2 N4 Association Update Procedure . 115
4.4.3.3 N4 Association Release Procedure . 115
4.4.3.4 N4 Report Procedure . 116
4.4.3.5 N4 PFD management Procedure . 116
4.4.4 SMF Pause of Charging procedure . 117
4.5 User Profile management procedures . 118
4.5.1 Subscriber Data Update Notification to AMF . 118
4.5.2 Session Management Subscriber Data Update Notification to SMF . 119
4.5.3 Purge of subscriber data in AMF . 119
4.6 Security procedures . 120
4.7 ME Identity check procedure . 120
4.8 RAN-CN interactions . 120
4.8.1 Connection Inactive procedure . 120
4.8.2 Connection Resume procedure . 120
4.8.3 N2 Notification procedure . 121
4.9 Handover procedures . 122
4.9.1 Handover procedures in 3GPP access . 122
4.9.1.1 General . 122
4.9.1.2 Xn based inter NG-RAN handover . 122
4.9.1.2.1 General . 122
4.9.1.2.2 Xn based inter NG-RAN handover without User Plane function re-allocation . 122
4.9.1.2.3 Xn based inter NG-RAN handover with insertion of intermediate UPF . 125
4.9.1.2.4 Xn based inter NG-RAN handover with re-allocation of intermediate UPF . 127
4.9.1.3 Inter NG-RAN node N2 based handover . 128
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3GPP TS 23.502 version 15.9.0 Release 15 5 ETSI TS 123 502 V15.9.0 (2020-03)
4.9.1.3.1 General . 128
4.9.1.3.2 Preparation phase. 130
4.9.1.3.3 Execution phase . 135
4.9.1.4 Inter NG-RAN node N2 based handover, Cancel . 138
4.9.2 Handover of a PDU Session procedure between 3GPP and untrusted non-3GPP access . 139
4.9.2.1 Handover of a PDU Session procedure from untrusted non-3GPP to 3GPP access (non-roaming
and roaming with local breakout) . 139
4.9.2.2 Handover of a PDU Session procedure from 3GPP to untrusted non-3GPP access (non-roaming

and roaming with local breakout) . 139
4.9.2.3 Handover of a PDU Session procedure from untrusted non-3GPP to 3GPP access (home routed
roaming) . 140
4.9.2.3.1 The target AMF is in the PLMN of the N3IWF . 140
4.9.2.3.2 The target AMF is not in the PLMN of the N3IWF (i.e. N3IWF in HPLMN) . 141
4.9.2.4 Handover of a PDU Session procedure from 3GPP to untrusted non-3GPP access (home routed

roaming) . 141
4.9.2.4.1 The selected N3IWF is in the registered PLMN . 141
4.9.2.4.2 The UE is roaming and the selected N3IWF is in the home PLMN . 142
4.10 NG-RAN Location reporting procedures . 143
4.11 System interworking procedures with EPC . 144
4.11.0 General . 144
4.11.0a Impacts to EPS Procedures . 144
4.11.0a.1 General . 144
4.11.0a.2 Interaction with PCC . 144
4.11.0a.3 Mobility Restrictions . 145
4.11.0a.4 PGW Selection . 145
4.11.0a.5 PDN Connection Establishment . 145
4.11.1 N26 based Interworking Procedures . 146
4.11.1.1 General . 146
4.11.1.2 Handover procedures . 147
4.11.1.2.1 5GS to EPS handover using N26 interface . 147
4.11.1.2.2 EPS to 5GS handover using N26 interface . 151
4.11.1.2.3 Handover Cancel . 157
4.11.1.3 Idle Mode Mobility procedures . 158
4.11.1.3.1 General . 158
4.11.1.3.2 5GS to EPS Idle mode mobility using N26 interface . 159
4.11.1.3.3 EPS to 5GS Mobility Registration Procedure (Idle and Connected State) using N26 interface . 161
4.11.1.4 Procedures for EPS bearer ID allocation . 165
4.11.1.4.1 EPS bearer ID allocation . 165
4.11.1.4.2 EPS bearer ID transfer . 168
4.11.1.4.3 EPS bearer ID revocation . 169
4.11.1.5 Impacts to EPS Procedures . 170
4.11.1.5.1 General . 170
4.11.1.5.2 E-UTRAN Initial Attach . 170
4.11.1.5.3 Tracking Area Update . 171
4.11.1.5.4 Session Management . 171
4.11.1.5.5 5GS to EPS handover using N26 interface . 173
4.11.1.6 EPS interworking information storing Procedure . 174
4.11.2 Interworking procedures without N26 interface . 174
4.11.2.1 General . 174
4.11.2.2 5GS to EPS Mobility . 174
4.11.2.3 EPS to 5GS Mobility . 177
4.11.2.4 Impacts to EPS Procedures . 179
4.11.2.4.1 E-UTRAN Attach . 179
4.11.2.4.2 Sess
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