ETSI TS 129 518 V16.18.0 (2026-03)

5G; 5G System; Access and Mobility Management Services; Stage 3 (3GPP TS 29.518 version 16.18.0 Release 16)

RTS/TSGC-0429518vgi0

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 4 - MAP/CAMEL/GTP/BCH/SS/TrFO/IMS/GUP/WLAN (formely CN4)
• Current Stage: 8 - Draft receipt by ETSI Secretariat
• Completion Date: 10-Mar-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
5G;
5G System;
Access and Mobility Management Services;
Stage 3
(3GPP TS 29.518 version 16.18.0 Release 16)


3GPP TS 29.518 version 16.18.0 Release 16 1 ETSI TS 129 518 V16.18.0 (2026-03)

Reference
RTS/TSGC-0429518vgi0
Keywords
5G
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ETSI
3GPP TS 29.518 version 16.18.0 Release 16 2 ETSI TS 129 518 V16.18.0 (2026-03)
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ETSI
3GPP TS 29.518 version 16.18.0 Release 16 3 ETSI TS 129 518 V16.18.0 (2026-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 13
1 Scope . 15
2 References . 15
3 Definitions and abbreviations . 16
3.1 Definitions . 16
3.2 Abbreviations . 17
4 Overview . 18
4.1 Introduction . 18
5 Services offered by the AMF . 18
5.1 Introduction . 18
5.2 Namf_Communication Service . 20
5.2.1 Service Description . 20
5.2.2 Service Operations . 20
5.2.2.1 Introduction . 20
5.2.2.2 UE Context Operations . 21
5.2.2.2.1 UEContextTransfer . 21
5.2.2.2.1.1 General . 21
5.2.2.2.1.2 Retrieve UE Context after successful UE authentication . 23
5.2.2.2.2 RegistrationStatusUpdate . 23
5.2.2.2.2.1 General . 23
5.2.2.2.3 CreateUEContext . 24
5.2.2.2.3.1 General . 24
5.2.2.2.4 ReleaseUEContext . 26
5.2.2.2.4.1 General . 26
5.2.2.2.5 RelocateUEContext . 26
5.2.2.2.5.1 General . 26
5.2.2.2.6 CancelRelocateUEContext . 27
5.2.2.2.6.1 General . 27
5.2.2.3 UE Specific N1N2 Message Operations . 28
5.2.2.3.1 N1N2MessageTransfer . 28
5.2.2.3.1.1 General . 28
5.2.2.3.1.2 Detailed behaviour of the AMF . 30
5.2.2.3.2 N1N2Transfer Failure Notification . 32
5.2.2.3.3 N1N2MessageSubscribe . 33
5.2.2.3.3.1 General . 33
5.2.2.3.4 N1N2MessageUnSubscribe . 34
5.2.2.3.4.1 General . 34
5.2.2.3.5 N1MessageNotify . 34
5.2.2.3.5.1 General . 34
5.2.2.3.5.2 Using N1MessageNotify in the Registration with AMF Re-allocation Procedure . 35
5.2.2.3.5.3 Using N1MessageNotify in the UE Assisted and UE Based Positioning Procedure . 35
5.2.2.3.5.4 Using N1MessageNotify in the UE Configuration Update for transparent UE Policy
delivery . 36
5.2.2.3.5.5 Using N1MessageNotify in the LCS Event Report, LCS Cancel Location and LCS
Periodic-Triggered Invoke Procedures . 36
5.2.2.3.5.6 Using N1MessageNotify in the UE triggered policy provisioning procedure to request UE

policies . 36
5.2.2.3.6 N2InfoNotify . 37
5.2.2.3.6.1 General . 37
5.2.2.3.6.2 Using N2InfoNotify during Inter NG-RAN node N2 based handover procedure. 37
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5.2.2.3.6.3 Using N2InfoNotify during Location Services procedures . 39
5.2.2.3.6.4 Using N2InfoNotify during AMF planned removal procedure with UDSF deployed

procedure . 39
5.2.2.4 Non-UE N2 Message Operations . 39
5.2.2.4.1 NonUeN2MessageTransfer . 39
5.2.2.4.1.1 General . 39
5.2.2.4.1.2 Obtaining Non UE Associated Network Assistance Data Procedure . 40
5.2.2.4.1.3 Warning Request Transfer Procedure . 40
5.2.2.4.1.4 Configuration Transfer Procedure . 41
5.2.2.4.1.5 RIM Information Transfer Procedures . 41
5.2.2.4.1.6 Broadcast of Assistance Data by an LMF . 41
5.2.2.4.2 NonUeN2InfoSubscribe . 41
5.2.2.4.2.1 General . 41
5.2.2.4.3 NonUeN2InfoUnSubscribe . 42
5.2.2.4.3.1 General . 42
5.2.2.4.4 NonUeN2InfoNotify . 43
5.2.2.4.4.1 General . 43
5.2.2.4.4.2 Using NonUeN2InfoNotify during Location Services procedures . 43
5.2.2.4.4.3 Use of NonUeN2InfoNotify for PWS related events . 43
5.2.2.5 AMF Status Change Operations . 44
5.2.2.5.1 AMFStatusChangeSubscribe . 44
5.2.2.5.1.1 General . 44
5.2.2.5.1.2 Creation of a subscription . 44
5.2.2.5.1.3 Modification of a subscription . 45
5.2.2.5.2 AMFStatusChangeUnSubscribe . 45
5.2.2.5.2.1 General . 45
5.2.2.5.3 AMFStatusChangeNotify . 46
5.2.2.5.3.1 General . 46
5.2.2.6 EBIAssignment . 46
5.2.2.6.1 General . 46
5.3 Namf_EventExposure Service . 48
5.3.1 Service Description . 48
5.3.2 Service Operations . 52
5.3.2.1 Introduction . 52
5.3.2.2 Subscribe . 52
5.3.2.2.1 General . 52
5.3.2.2.2 Creation of a subscription . 52
5.3.2.2.3 Modification of a subscription . 54
5.3.2.3 Unsubscribe . 54
5.3.2.3.1 General . 54
5.3.2.4 Notify . 55
5.3.2.4.1 General . 55
5.3.2.4.2 Event Subscription Synchronization for specific UE . 55
5.4 Namf_MT Service . 56
5.4.1 Service Description . 56
5.4.2 Service Operations . 56
5.4.2.1 Introduction . 56
5.4.2.2 EnableUEReachability . 56
5.4.2.2.1 General . 56
5.4.2.3 ProvideDomainSelectionInfo . 57
5.4.2.3.1 General . 57
5.5 Namf_Location Service . 58
5.5.1 Service Description . 58
5.5.2 Service Operations . 58
5.5.2.1 Introduction . 58
5.5.2.2 ProvidePositioningInfo . 58
5.5.2.2.1 General . 58
5.5.2.3 EventNotify . 59
5.5.2.3.1 General . 59
5.5.2.4 ProvideLocationInfo . 60
5.5.2.4.1 General . 60
5.5.2.5 CancelLocation . 61
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5.5.2.5.1 General . 61
6 API Definitions . 62
6.1 Namf_Communication Service API . 62
6.1.1 API URI . 62
6.1.2 Usage of HTTP . 62
6.1.2.1 General . 62
6.1.2.2 HTTP standard headers . 63
6.1.2.2.1 General . 63
6.1.2.2.2 Content type . 63
6.1.2.3 HTTP custom headers . 63
6.1.2.3.1 General . 63
6.1.2.4 HTTP multipart messages . 63
6.1.3 Resources . 64
6.1.3.1 Overview . 64
6.1.3.2 Resource: Individual ueContext . 65
6.1.3.2.1 Description . 65
6.1.3.2.2 Resource Definition . 66
6.1.3.2.3 Resource Standard Methods . 66
6.1.3.2.3.1 PUT . 66
6.1.3.2.4 Resource Custom Operations . 68
6.1.3.2.4.1 Overview . 68
6.1.3.2.4.2 Operation: release (POST) . 68
6.1.3.2.4.2.1 Description . 68
6.1.3.2.4.2.2 Operation Definition . 68
6.1.3.2.4.3 Operation: assign-ebi (POST) . 69
6.1.3.2.4.3.1 Description . 69
6.1.3.2.4.3.2 Operation Definition . 69
6.1.3.2.4.4 Operation: transfer (POST) . 72
6.1.3.2.4.4.1 Description . 72
6.1.3.2.4.4.2 Operation Definition . 72
6.1.3.2.4.5 Operation: transfer-update (POST) . 74
6.1.3.2.4.5.1 Description . 74
6.1.3.2.4.5.2 Operation Definition . 74
6.1.3.2.4.6 Operation: relocate (POST) . 75
6.1.3.2.4.6.1 Description . 75
6.1.3.2.4.6.2 Operation Definition . 75
6.1.3.2.4.7 Operation: cancel-relocate (POST) . 76
6.1.3.2.4.7.1 Description . 76
6.1.3.2.4.7.2 Operation Definition . 76
6.1.3.3 Resource: N1N2 Subscriptions Collection for Individual UE Contexts . 77
6.1.3.3.1 Description . 77
6.1.3.3.2 Resource Definition . 77
6.1.3.3.3 Resource Standard Methods . 78
6.1.3.3.3.1 POST. 78
6.1.3.3.4 Resource Custom Operations . 79
6.1.3.4 Resource: N1N2 Individual Subscription . 79
6.1.3.4.1 Description . 79
6.1.3.4.2 Resource Definition . 79
6.1.3.4.3 Resource Standard Methods . 80
6.1.3.4.3.1 DELETE . 80
6.1.3.4.4 Resource Custom Operations . 80
6.1.3.5 Resource: N1N2 Messages Collection . 81
6.1.3.5.1 Description . 81
6.1.3.5.2 Resource Definition . 81
6.1.3.5.3 Resource Standard Methods . 81
6.1.3.5.3.1 POST. 81
6.1.3.6 Resource: subscriptions collection . 85
6.1.3.6.1 Description . 85
6.1.3.6.2 Resource Definition . 85
6.1.3.6.3 Resource Standard Methods . 85
6.1.3.6.3.1 POST. 85
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6.1.3.7 Resource: individual subscription . 87
6.1.3.7.1 Description . 87
6.1.3.7.2 Resource Definition . 87
6.1.3.7.3 Resource Standard Methods . 87
6.1.3.7.3.1 DELETE . 87
6.1.3.7.3.2 PUT . 88
6.1.3.8 Resource: Non UE N2 Messages Collection . 89
6.1.3.8.1 Description . 89
6.1.3.8.2 Resource Definition . 89
6.1.3.8.3 Resource Standard Methods . 90
6.1.3.8.4 Resource Custom Operations . 90
6.1.3.8.4.1 Overview . 90
6.1.3.8.4.2 Operation: transfer . 90
6.1.3.8.4.2.1 Description . 90
6.1.3.8.4.2.2 Operation Definition . 90
6.1.3.9 Resource: Non UE N2 Messages Subscriptions Collection . 92
6.1.3.9.1 Description . 92
6.1.3.9.2 Resource Definition . 92
6.1.3.9.3 Resource Standard Methods . 92
6.1.3.9.3.1 POST. 92
6.1.3.9.4 Resource Custom Operations . 93
6.1.3.10 Resource: Non UE N2 Message Notification Individual Subscription . 94
6.1.3.10.1 Description . 94
6.1.3.10.2 Resource Definition . 94
6.1.3.10.3 Resource Standard Methods . 94
6.1.3.10.3.1 DELETE . 94
6.1.3.10.4 Resource Custom Operations . 95
6.1.4 Custom Operations without associated resources . 95
6.1.5 Notifications . 95
6.1.5.1 General . 95
6.1.5.2 AMF Status Change Notification . 95
6.1.5.2.1 Description . 95
6.1.5.2.2 Notification Definition . 96
6.1.5.2.3 Notification Standard Methods . 96
6.1.5.2.3.1 POST. 96
6.1.5.3 Non UE N2 Information Notification . 97
6.1.5.3.1 Description . 97
6.1.5.3.2 Notification Definition . 97
6.1.5.3.3 Notification Standard Methods . 97
6.1.5.3.3.1 POST. 97
6.1.5.4 N1 Message Notification . 98
6.1.5.4.1 Description . 98
6.1.5.4.2 Notification Definition . 98
6.1.5.4.3 Notification Standard Methods . 98
6.1.5.4.3.1 POST. 98
6.1.5.5 UE Specific N2 Information Notification . 99
6.1.5.5.1 Description . 99
6.1.5.5.2 Notification Definition . 99
6.1.5.5.3 Notification Standard Methods . 99
6.1.5.5.3.1 POST. 99
6.1.5.6 N1N2 Transfer Failure Notification . 100
6.1.5.6.1 Description . 100
6.1.5.6.2 Notification Definition . 101
6.1.5.6.3 Notification Standard Methods . 101
6.1.5.6.3.1 POST. 101
6.1.5.7 Void. 102
6.1.6 Data Model . 102
6.1.6.1 General . 102
6.1.6.2 Structured data types . 109
6.1.6.2.1 Introduction . 109
6.1.6.2.2 Type: SubscriptionData . 109
6.1.6.2.3 Type: AmfStatusChangeNotification . 109
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6.1.6.2.4 Type: AmfStatusInfo . 110
6.1.6.2.5 Type: AssignEbiData . 110
6.1.6.2.6 Type: AssignedEbiData . 110
6.1.6.2.7 Type: AssignEbiFailed . 111
6.1.6.2.8 Type: UEContextRelease . 111
6.1.6.2.9 Type: N2InformationTransferReqData . 111
6.1.6.2.10 Type: NonUeN2InfoSubscriptionCreateData . 112
6.1.6.2.11 Type: NonUeN2InfoSubscriptionCreatedData . 112
6.1.6.2.12 Type: UeN1N2InfoSubscriptionCreateData . 113
6.1.6.2.13 Type: UeN1N2InfoSubscriptionCreatedData . 113
6.1.6.2.14 Type: N2InformationNotification .
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