ETSI TS 129 502 V16.9.0 (2021-09)

5G; 5G System; Session Management Services; Stage 3 (3GPP TS 29.502 version 16.9.0 Release 16)

RTS/TSGC-0429502vg90

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 4 - MAP/CAMEL/GTP/BCH/SS/TrFO/IMS/GUP/WLAN (formely CN4)
• Current Stage: 12 - Completion
• Completion Date: 28-Sep-2021

Standards Content (Sample)

ETSI TS 129 502 V16.9.0 (2021-09)






TECHNICAL SPECIFICATION
5G;
5G System;
Session Management Services;
Stage 3
(3GPP TS 29.502 version 16.9.0 Release 16)

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3GPP TS 29.502 version 16.9.0 Release 16 1 ETSI TS 129 502 V16.9.0 (2021-09)



Reference
RTS/TSGC-0429502vg90
Keywords
5G
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3GPP TS 29.502 version 16.9.0 Release 16 2 ETSI TS 129 502 V16.9.0 (2021-09)
Intellectual Property Rights
Essential patents
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pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
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Legal Notice
This Technical Specification (TS) has been produced by ETSI 3rd Generation Partnership Project (3GPP).
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Modal verbs terminology
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"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.
ETSI

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3GPP TS 29.502 version 16.9.0 Release 16 3 ETSI TS 129 502 V16.9.0 (2021-09)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 9
1 Scope . 11
2 References . 11
3 Definitions and abbreviations . 12
3.1 Definitions . 12
3.2 Abbreviations . 13
4 Overview . 13
4.1 Introduction . 13
5 Services offered by the SMF . 14
5.1 Introduction . 14
5.2 Nsmf_PDUSession Service . 15
5.2.1 Service Description . 15
5.2.2 Service Operations . 16
5.2.2.1 Introduction . 16
5.2.2.2 Create SM Context service operation . 17
5.2.2.2.1 General . 17
5.2.2.2.2 EPS to 5GS Idle mode mobility using N26 interface (with or without data forwarding) . 20
5.2.2.2.3 EPS to 5GS Handover Preparation using N26 interface . 22
5.2.2.2.4 I-SMF Insertion, Change or Removal during Xn based Handover . 23
5.2.2.2.5 I-SMF Insertion, Change or Removal during N2 based Handover . 23
5.2.2.2.6 Service Request with I-SMF insertion/change/removal or with V-SMF change . 24
5.2.2.2.7 Registration procedure for a UE with a PDU session with I-SMF insertion, change and

removal . 24
5.2.2.2.8 SMF Context Transfer procedure, LBO or no Roaming, no I-SMF . 25
5.2.2.2.9 I-SMF Context Transfer procedure . 25
5.2.2.2.10 Handover between 3GPP and non-3GPP accesses with I-SMF insertion/removal or V-SMF
change . 26
5.2.2.3 Update SM Context service operation. 26
5.2.2.3.1 General . 26
5.2.2.3.2 Activation and Deactivation of the User Plane connection of a PDU session . 28
5.2.2.3.2.1 General . 28
5.2.2.3.2.2 Activation of User Plane connectivity of a PDU session . 29
5.2.2.3.2.3 Deactivation of User Plane connectivity of a PDU session . 30
5.2.2.3.2.4 Changing the access type of a PDU session from non-3GPP access to 3GPP access during

a Service Request procedure . 31
5.2.2.3.3 Xn Handover . 32
5.2.2.3.4 N2 Handover . 33
5.2.2.3.4.1 General . 33
5.2.2.3.4.2 N2 Handover Preparation . 34
5.2.2.3.4.3 N2 Handover Execution . 35
5.2.2.3.4.4 N2 Handover Cancellation . 36
5.2.2.3.5 Handover between 3GPP and untrusted non-3GPP access procedures . 37
5.2.2.3.5.1 General . 37
5.2.2.3.5.2 Handover of a PDU session without AMF change or with target AMF in same PLMN . 37
5.2.2.3.6 Inter-AMF change or mobility . 38
5.2.2.3.7 RAN Initiated QoS Flow Mobility . 38
5.2.2.3.8 EPS to 5GS Handover using N26 interface . 39
5.2.2.3.8.1 General . 39
5.2.2.3.8.2 EPS to 5GS Handover Preparation . 39
5.2.2.3.8.3 EPS to 5GS Handover Execution . 40
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3GPP TS 29.502 version 16.9.0 Release 16 4 ETSI TS 129 502 V16.9.0 (2021-09)
5.2.2.3.8.4 EPS to 5GS Handover Cancellation . 40
5.2.2.3.8.5 EPS to 5GS Handover Failure . 40
5.2.2.3.9 5GS to EPS Handover using N26 interface . 40
5.2.2.3.9.1 General . 40
5.2.2.3.9.2 Data forwarding tunnels setup during 5GS to EPS handover . 40
5.2.2.3.9.3 Indirect data forwarding tunnels removal for 5GS to EPS handover cancellation or failure . 41
5.2.2.3.10 P-CSCF Restoration Procedure via AMF . 41
5.2.2.3.11 AMF requested PDU Session Release due to duplicated PDU Session Id . 42
5.2.2.3.12 AMF requested PDU Session Release due to slice not available . 42
5.2.2.3.13 Indirect Data Forwarding Tunnel establishment during N2 based Handover with I-SMF . 42
5.2.2.3.13A Indirect Data Forwarding Tunnel removal during N2 based Handover with I-SMF . 43
5.2.2.3.14 Request to forward buffered downlink data packets at I-UPF . 44
5.2.2.3.15 Connection Suspend procedure . 45
5.2.2.3.16 Connection Resume in CM-IDLE with Suspend procedure . 45
5.2.2.3.17 AMF requested PDU Session Release due to Network Slice-Specific Authentication and
Authorization failure or revocation . 46
5.2.2.3.18 5GS to EPS Idle mode mobility using N26 interface with data forwarding . 46
5.2.2.3.19 AMF requested PDU Session Release due to Control Plane Only indication associated with
PDU Session is not applicable any longer . 47
5.2.2.4 Release SM Context service operation . 47
5.2.2.4.1 General . 47
5.2.2.5 Notify SM Context Status service operation . 49
5.2.2.5.1 General . 49
5.2.2.6 Retrieve SM Context service operation. 52
5.2.2.6.1 General . 52
5.2.2.7 Create service operation . 53
5.2.2.7.1 General . 53
5.2.2.7.2 EPS to 5GS Idle mode mobility . 56
5.2.2.7.3 EPS to 5GS Handover Preparation . 57
5.2.2.7.4 N2 Handover Preparation with I-SMF Insertion . 58
5.2.2.7.5 Xn Handover with I-SMF Insertion . 58
5.2.2.8 Update service operation . 58
5.2.2.8.1 General . 58
5.2.2.8.2 Update service operation towards H-SMF or SMF . 60
5.2.2.8.2.1 General . 60
5.2.2.8.2.2 UE or network (e.g. AMF, V-SMF, I-SMF) requested PDU session modification . 60
5.2.2.8.2.3 UE requested PDU session release . 61
5.2.2.8.2.4 EPS to 5GS Handover Execution . 61
5.2.2.8.2.5 Handover between 3GPP access and untrusted or trusted non-3GPP access . 62
5.2.2.8.2.6 P-CSCF Restoration Procedure via AMF . 62
5.2.2.8.2.7 Addition of PSA and BP or UL CL controlled by I-SMF . 63
5.2.2.8.2.8 Removal of PSA and BP or UL CL controlled by I-SMF. 63
5.2.2.8.2.9 Change of PSA for IPv6 multi-homing or UL CL controlled by I-SMF . 63
5.2.2.8.2.10 PDU Session modification with I-SMF or V-SMF change . 64
5.2.2.8.2.11 Sending by I-SMF of N4 notifications related with traffic usage reporting . 64
5.2.2.8.2.12 N2 Handover Execution with I-SMF Insertion . 65
5.2.2.8.2.13 N2 Handover Cancellation with I-SMF Insertion . 65
5.2.2.8.2.14 EPS to 5GS Handover Cancellation . 65
5.2.2.8.2.15 5G-AN requested PDU session resource release . 66
5.2.2.8.2.16 Xn Handover with or without I-SMF or V-SMF Change . 66
5.2.2.8.2.17 EPS to 5GS Handover Failure . 66
5.2.2.8.2.18 EPS Bearer ID revocation . 67
5.2.2.8.2.19 Network requested PDU session release . 67
5.2.2.8.2.20 N2 Handover Execution with or without I-SMF or V-SMF Change . 67
5.2.2.8.3 Update service operation towards V-SMF or I-SMF . 68
5.2.2.8.3.1 General . 68
5.2.2.8.3.2 Network (e.g. H-SMF, SMF) requested PDU session modification . 68
5.2.2.8.3.3 Network (e.g. H-SMF, SMF) requested PDU session release . 69
5.2.2.8.3.4 Handover between 3GPP and untrusted non-3GPP access, from 5GC-N3IWF to EPS or
from 5GS to EPC/ePDG . 70
5.2.2.8.3.5 EPS Bearer ID assignment . 70
5.2.2.8.3.6 Addition of PSA and BP or UL CL controlled by I-SMF . 71
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3GPP TS 29.502 version 16.9.0 Release 16 5 ETSI TS 129 502 V16.9.0 (2021-09)
5.2.2.8.3.7 Removal of PSA and BP or UL CL controlled by I-SMF. 71
5.2.2.8.3.8 Change of PSA for IPv6 multi-homing or UL CL controlled by I-SMF . 71
5.2.2.8.3.9 Policy update procedures with an I-SMF . 72
5.2.2.9 Release service operation . 72
5.2.2.9.1 General . 72
5.2.2.10 Notify Status service operation . 74
5.2.2.10.1 General . 74
5.2.2.11 Send MO Data service operation . 75
5.2.2.11.1 General . 75
5.2.2.12 Transfer MO Data service operation . 76
5.2.2.12.1 General . 76
5.2.2.13 Transfer MT Data service operation . 76
5.2.2.13.1 General . 76
5.2.2.14 Retrieve service operation . 77
5.2.2.14.1 General . 77
5.2.3 General procedures . 78
5.2.3.1 Transfer of NAS SM information between UE and H-SMF for Home Routed PDU sessions . 78
5.2.3.1.1 General . 78
5.2.3.1.2 V-SMF Behaviour . 78
5.2.3.1.3 H-SMF Behaviour . 79
5.2.3.2 Transfer of NAS SM information between UE and SMF for PDU sessions with an I-SMF . 79
5.2.3.2.1 General . 79
5.2.3.3 Detection and handling of late arriving requests . 79
5.2.3.3.1 Handling of requests which collide with an existing SM context or PDU session context . 79
5.2.3.3.1.1 General . 79
5.2.3.3.1.2 Principles . 79
5.2.3.3.2 Detection and handling of requests which have timed out at the HTTP client . 80
5.2.3.3.2.1 General . 80
5.2.3.4 UE Location Information . 80
6 API Definitions . 80
6.1 Nsmf_PDUSession Service API . 80
6.1.1 API URI . 80
6.1.2 Usage of HTTP . 81
6.1.2.1 General . 81
6.1.2.2 HTTP standard headers . 81
6.1.2.2.1 General . 81
6.1.2.2.2 Content type . 81
6.1.2.3 HTTP custom headers . 82
6.1.2.3.1 General . 82
6.1.2.3.2 3gpp-Sbi-Origination-Timestamp. 82
6.1.2.4 HTTP multipart messages . 82
6.1.2.5 HTTP/2 request retries . 83
6.1.3 Resources . 83
6.1.3.1 Overview . 83
6.1.3.2 Resource: SM contexts collection . 85
6.1.3.2.1 Description . 85
6.1.3.2.2 Resource Definition . 85
6.1.3.2.3 Resource Standard Methods . 86
6.1.3.2.3.1 POST. 86
6.1.3.2.4 Resource Custom Operations . 90
6.1.3.3 Resource: Individual SM context . 90
6.1.3.3.1 Description . 90
6.1.3.3.2 Resource Definition . 90
6.1.3.3.3 Resource Standard Methods . 90
6.1.3.3.4 Resource Custom Operations . 90
6.1.3.3.4.1 Overview . 90
6.1.3.3.4.2 Operation: modify .
...