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

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
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (https://ipr.etsi.org/).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
The present document may refer to technical specifications or reports using their 3GPP identities. These shall be
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Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
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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