ETSI TS 129 122 V15.17.0 (2026-03)

Universal Mobile Telecommunications System (UMTS); LTE; 5G; T8 reference point for Northbound APIs (3GPP TS 29.122 version 15.17.0 Release 15)

RTS/TSGC-0329122vfh0

General Information

• Status: Not Published
• Technical Committee: 3GPP CT 3 - Interworking with external networks (formely CN3)
• Current Stage: 8 - Draft receipt by ETSI Secretariat
• Completion Date: 10-Mar-2026

Standards Content (Sample)

TECHNICAL SPECIFICATION
Universal Mobile Telecommunications System (UMTS);
LTE;
5G;
T8 reference point for Northbound APIs
(3GPP TS 29.122 version 15.17.0 Release 15)


3GPP TS 29.122 version 15.17.0 Release 15 1 ETSI TS 129 122 V15.17.0 (2026-03)

Reference
RTS/TSGC-0329122vfh0
Keywords
5G,LTE,UMTS
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ETSI
3GPP TS 29.122 version 15.17.0 Release 15 2 ETSI TS 129 122 V15.17.0 (2026-03)
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ETSI
3GPP TS 29.122 version 15.17.0 Release 15 3 ETSI TS 129 122 V15.17.0 (2026-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 12
1 Scope . 13
2 References . 13
3 Definitions and abbreviations . 15
3.1 Definitions . 15
3.2 Abbreviations . 15
4 T8 reference point . 16
4.1 Overview . 16
4.2 Reference model . 16
4.3 Functional ele me nts . 17
4.3.1 SCEF . 17
4.3.2 SCS/AS . 17
4.4 Procedures over T8 reference point . 17
4.4.1 Introduction. 17
4.4.2 Monitoring Procedures . 17
4.4.2.1 General . 17
4.4.2.2 Monitoring Events Configuration . 17
4.4.2.2.1 General . 17
4.4.2.2.2 Monitoring Events Configuration via HSS . 19
4.4.2.2.3 Monitoring Events Configuration directly via MME/SGSN . 20
4.4.2.2.4 Monitoring Events Configuration via PCRF . 20
4.4.2.3 Reporting of Monitoring Event Procedure . 21
4.4.2.4 Network-initiated Explicit Monitoring Event Deletion Procedure . 22
4.4.3 Procedures for resource management of Background Data Transfer . 22
4.4.4 Procedures for changing the chargeable party at session set up or during the session . 23
4.4.5 Procedures for Non-IP Data Delivery . 24
4.4.5.1 General . 24
4.4.5.2 NIDD Configuration . 24
4.4.5.2.1 NIDD Configuration for a single UE. 24
4.4.5.2.2 NIDD Configuration for a group of UEs . 25
4.4.5.3 Mobile Terminated NIDD procedure . 25
4.4.5.3.1 Mobile Terminated NIDD for a single UE . 25
4.4.5.3.2 Mobile Terminated NIDD for a group of UEs . 27
4.4.5.4 Mobile Originated NIDD procedure . 27
4.4.5.5 NIDD Authorisation Update procedure . 27
4.4.6 Procedures for Device Triggering . 28
4.4.7 Procedures for Group Message Delivery . 29
4.4.7.1 General . 29
4.4.7.2 Group Message Delivery via MBMS . 29
4.4.7.2.1 General . 29
4.4.7.2.2 Group Message Delivery via MBMS by MB2 . 29
4.4.7.2.3 Group message Delivery via MBMS by xMB. 31
4.4.8 Procedures for Reporting of Network Status . 33
4.4.8.1 General . 33
4.4.8.2 Network Status Reporting Subscription . 33
4.4.8.3 Network Status Reporting Notification . 34
4.4.9 Procedures for Communication Pattern Parameters Provisioning . 34
4.4.10 Procedures for PFD Management . 35
4.4.11 Procedures for Enhanced Coverage Restriction Control . 36
4.4.12 Procedures for Network Parameter Configuration . 37
4.4.12.1 General . 37
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4.4.12.2 Configuration Request for an individual UE . 37
4.4.12.3 Configuration Request for a group of UEs . 38
4.4.13 Procedures for setting up an AS session with required QoS . 38
4.4.14 Procedures for MSISDN-less Mobile Originated SMS . 39
4.4.14.1 General . 39
4.4.14.2 Delivery of MSISDN-less MO SMS . 39
5 T8 APIs . 40
5.1 Introduction . 40
5.2 Information applicable to several APIs . 40
5.2.1 Data Types . 40
5.2.1.1 Introduction . 40
5.2.1.2 Referenced structured data types . 40
5.2.1.2.1 Type: SponsorInformation . 40
5.2.1.2.2 Type: UsageThreshold . 40
5.2.1.2.3 Type: TimeWindow . 41
5.2.1.2.4 Type: Acknowledgement . 41
5.2.1.2.5 Type: NotificationData . 41
5.2.1.2.6 Type: EventReport . 41
5.2.1.2.7 Type: AccumulatedUsage. 41
5.2.1.2.8 Type: FlowInfo . 42
5.2.1.2.9 Type: TestNotification . 42
5.2.1.2.10 Type: WebsockNotifConfig . 42
5.2.1.2.11 Type: LocationArea . 43
5.2.1.2.12 Type: ProblemDetails . 43
5.2.1.2.13 Type: InvalidParam . 43
5.2.1.2.14 Type: PlmnId . 43
5.2.1.2.15 Type: ConfigResult . 44
5.2.1.2.16 Type: UsageThresholdRm . 44
5.2.1.2.17 Type: LocationArea5G . 44
5.2.1.3 Referenced Simple data types and enumerations . 44
5.2.1.3.1 Introduction . 44
5.2.1.3.2 Simple data types . 44
5.2.1.3.3 Enumeration: Event . 46
5.2.1.3.4 Enumeration: ResultReason . 46
5.2.1.4 Conventions for documenting structured data types . 46
5.2.2 Usage of HTTP . 47
5.2.2.1 General . 47
5.2.2.2 Usage of the HTTP PATCH method . 47
5.2.3 Content type . 47
5.2.4 URI structure . 47
5.2.5 Notifications . 48
5.2.5.1 General . 48
5.2.5.2 Notification Delivery using a separate HTTP connection . 48
5.2.5.3 Notification Test Event . 48
5.2.5.4 Notification Delivery using Websocket . 48
5.2.6 Error handling . 50
5.2.7 Feature negotiation . 53
5.2.8 HTTP custom headers . 53
5.2.8.1 General . 53
5.2.8.2 Reused HTTP custom headers . 53
5.2.9 Conventions for Open API specification files . 53
5.2.9.1 General . 53
5.2.9.2 Formatting of OpenAPI files . 53
5.2.9.3 Structured data types . 54
5.2.9.4 Info . 55
5.2.9.5 Servers . 55
5.2.9.6 References to other 3GPP-defined Open API specification files . 55
5.2.9.7 Server-initiated communication . 56
5.2.9.8 Describing the body of HTTP PATCH requests . 56
5.2.9.9 Error Responses . 57
5.2.9.10 Enumerations . 58
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5.2.9.11 Read only attribute . 58
5.2.9.12 externalDocs. 59
5.3 MonitoringEvent API . 59
5.3.1 Overview . 59
5.3.2 Data model . 59
5.3.2.1 Resource data types . 59
5.3.2.1.1 Introduction . 59
5.3.2.1.2 Type: MonitoringEventSubscription . 59
5.3.2.2 Notification data types . 63
5.3.2.2.1 Introduction . 63
5.3.2.2.2 Type: MonitoringNotification . 63
5.3.2.3 Referenced structured data types . 64
5.3.2.3.1 Introduction . 64
5.3.2.3.2 Type: MonitoringEventReport . 64
5.3.2.3.3 Type: IdleStatusInfo . 67
5.3.2.3.4 Type: UePerLocationReport . 67
5.3.2.3.5 Type: LocationInfo . 68
5.3.2.3.6 Type: FailureCause . 68
5.3.2.4 Referenced simple data types and enumerations . 69
5.3.2.4.1 Introduction . 69
5.3.2.4.2 Simple data types . 69
5.3.2.4.3 Enumeration: MonitoringType . 69
5.3.2.4.4 Enumeration: ReachabilityType . 70
5.3.2.4.5 Enumeration: LocationType . 70
5.3.2.4.6 Enumeration: AssociationType . 71
5.3.2.4.7 Enumeration: Accuracy . 71
5.3.3 Resource structure. 71
5.3.3.1 General . 71
5.3.3.2 Resource: Monitoring Event Subscriptions . 72
5.3.3.2.1 Introduction . 72
5.3.3.2.2 Resource definition . 72
5.3.3.2.3 Resource methods . 72
5.3.3.3 Resource: Individual Monitoring Event Subscription . 74
5.3.3.3.1 Introduction . 74
5.3.3.3.2 Resource definition . 75
5.3.3.3.3 Resource methods . 75
5.3.3.4 Monitoring Notification . 77
5.3.3.4.1 Introduction . 77
5.3.3.4.2 Resource definition . 77
5.3.3.4.3 Resource methods . 77
5.3.4 Used Features . 77
5.3.5 Error handling . 78
5.3.5.1 General . 78
5.3.5.2 Protocol Errors . 78
5.3.5.3 Application Errors . 78
5.4 ResourceManagementOfBdt API . 79
5.4.1 Overview . 79
5.4.2 Data model . 79
5.4.2.1 Resource data types . 79
5.4.2.1.1 Introduction . 79
5.4.2.1.2 Type: Bdt . 79
5.4.2.1.3 Type: BdtPatch . 80
5.4.2.2 Referenced structured data types . 80
5.4.2.2.1 Introduction . 80
5.4.2.2.2 Type: TransferPolicy . 80
5.4.3 Resource structure. 81
5.4.3.1 General . 81
5.4.3.2 Resource: BDT Subscriptions . 81
5.4.3.2.1 Introduction . 81
5.4.3.2.2 Resource definition . 81
5.4.3.2.3 Resource methods . 82
5.4.3.3 Resource: Individual BDT Subscription . 83
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5.4.3.3.1 Introduction . 83
5.4.3.3.2 Resource definition . 83
5.4.3.3.3 Resource methods . 83
5.4.4 Used Features . 85
5.5 ChargeableParty API . 86
5.5.1 Overview . 86
5.5.2 Data model . 86
5.5.2.1 Resource data types . 86
5.5.2.1.1 Introduction . 86
5.5.2.1.2 Type: ChargeableParty . 86
5.5.2.1.3 Type: ChargeablePartyPatch . 87
5.5.3 Resource structure. 88
5.5.3.1 General . 88
5.5.3.2 Resource: Chargeable Party Transactions . 88
5.5.3.2.1 Introduction . 88
5.5.3.2.2 Resource definition . 89
5.5.3.2.3 Resource methods . 89
5.5.3.3 Resource: Individual Chargeable Party Transaction . 90
5.5.3.3.1 Introduction . 90
5.5.3.3.2 Resource definition . 90
5.5.3.3.3 Resource methods . 90
5.5.3.4 Event Notification . 92
5.5.3.4.1 Introduction . 92
5.5.3.4.2 Resource definition . 92
5.5.3.4.3 Resource methods . 92
5.5.4 Used Features . 93
5.6 NIDD API . 93
5.6.1 Overview . 93
5.6.2 Data model . 93
5.6.2.1 Resource data types . 93
5.6.2.1.1 Introduction . 93
5.6.2.1.2 Type: NiddConfiguration . 93
5.6.2.1.3 Type: NiddDownlinkDataTransfer . 96
5.6.2.1.4 Type: NiddUplinkDataNotification . 99
5.6.2.1.5 Type: NiddDownlinkDataDeliveryStatusNotification. 99
5.6.2.1.6 Type: NiddConfigurationStatusNotifiation . 100
5.6.2.1.7 Type: NiddConfigurationPatch . 100
5.6.2.1.8 Type: GmdNiddDownlinkDataDeliveryNotification . 101
5.6.2.2 Referenced structured data types . 101
5.6.2.2.1 Introduction . 101
5.6.2.2.2 Type: RdsPort . 102
5.6.2.2.3 Type: GmdResult. 102
5.6.2.2.4 Type: NiddDownlinkDataDeliveryFailure . 102
5.6.2.3 Referenced simple data types and enumerations . 102
5.6.2.3.1 Introduction . 102
5.6.2.3.2 Simple data types . 102
5.6.2.3.3 Enumeration: PdnEstablishmentOptions . 103
5.6.2.3.4 Enumeration: DeliveryStatus . 103
5.6.2.3.5 Enumeration: NiddStatus . 103
5.6.2.3.6 Enumeration: PdnEstablishmentOptionsRm . 104
5.6.3 Resource structure. 104
5.6.3.1 General . 104
5.6.3.2 Resource: NIDD Configurations . 105
5.6.3.2.1 Introduction . 105
5.6.3.2.2 Resource definition . 105
5.6.3.2.3 Resource methods . 106
5.6.3.3 Resource: Individual NIDD Configuration . 107
5.6.3.3.1 Introduction . 107
5.6.3.3.2 Resource definition . 107
5.6.3.3.3 Resource methods . 107
5.6.3.4 Resource: NIDD downlink data deliveries . 109
5.6.3.4.1 Introduction . 109
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5.6.3.4.2 Resource definition . 109
5.6.3.4.3 Resource methods . 109
5.6.3.5 Resource: Individual NIDD downlink data delivery . 111
5.6.3.5.1 Introduction . 111
5.6.3.5.2 Resource definition . 111
5.6.3.5.3 Resource methods .
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