ETSI TS 129 521 V19.6.0 (2026-03)

5G; 5G System; Binding Support Management Service; Stage 3 (3GPP TS 29.521 version 19.6.0 Release 19)

RTS/TSGC-0329521vj60

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
5G;
5G System;
Binding Support Management Service;
Stage 3
(3GPP TS 29.521 version 19.6.0 Release 19)


3GPP TS 29.521 version 19.6.0 Release 19 1 ETSI TS 129 521 V19.6.0 (2026-03)

Reference
RTS/TSGC-0329521vj60
Keywords
5G
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ETSI
3GPP TS 29.521 version 19.6.0 Release 19 2 ETSI TS 129 521 V19.6.0 (2026-03)
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3GPP TS 29.521 version 19.6.0 Release 19 3 ETSI TS 129 521 V19.6.0 (2026-03)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 6
1 Scope . 7
2 References . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 8
4 Binding Support Management Service . 8
4.1 Service Description . 8
4.1.1 Overview . 8
4.1.2 Service Architecture . 9
4.1.3 Network Functions . 10
4.1.3.1 Binding Support Function (BSF) . 10
4.1.3.2 NF Service Consumers . 10
4.2 Service Operations . 12
4.2.1 Introduction. 12
4.2.2 Nbsf_Management_Register Service Operation . 12
4.2.2.1 General . 12
4.2.2.2 Register a new PCF for a PDU Session binding information. 13
4.2.2.3 Register a new PCF for a UE binding information . 15
4.2.2.4 Register a new PCF for an MBS Session binding information . 16
4.2.3 Nbsf_Management_Deregister Service Operation . 17
4.2.3.1 General . 17
4.2.3.2 Deregister an individual PCF for a PDU Session binding information . 18
4.2.3.3 Deregister an individual PCF for a UE binding information . 19
4.2.3.4 Deregister an individual PCF for an MBS Session binding information . 19
4.2.4 Nbsf_Management_Discovery Service Operation . 20
4.2.4.1 General . 20
4.2.4.2 Retrieve the PCF binding information for a PDU session. 20
4.2.4.3 Retrieve the PCF binding information for a UE . 21
4.2.4.4 Retrieve the PCF binding information for an MBS Session . 22
4.2.5 Nbsf_Management_Update Service Operation. 23
4.2.5.1 General . 23
4.2.5.2 Update an existing PCF for a PDU Session binding information . 23
4.2.5.3 Update an existing PCF for a UE binding information . 25
4.2.5.4 Update an existing PCF for an MBS Session binding information . 26
4.2.6 Nbsf_Management_Subscribe Service Operation . 26
4.2.6.1 General . 26
4.2.6.2 Creating a new subscription . 26
4.2.6.3 Modifying an existing subscription . 28
4.2.7 Nbsf_Management_Unsubscribe Service Operation . 29
4.2.7.1 General . 29
4.2.7.2 Unsubscription from event notifications . 29
4.2.8 Nbsf_Management_Notify Service Operation . 29
4.2.8.1 General . 29
4.2.8.2 Notification about subscribed events . 30
5 Nbsf_Management Service API . 31
5.1 Introduction . 31
5.2 Usage of HTTP . 31
5.2.1 General . 31
5.2.2 HTTP standard headers . 32
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5.2.2.1 General . 32
5.2.2.2 Content type . 32
5.2.3 HTTP custom headers . 32
5.2.3.1 General . 32
5.3 Resources . 32
5.3.1 Resource Structure . 32
5.3.2 Resource: PCF for a PDU Session Bindings . 34
5.3.2.1 Description . 34
5.3.2.2 Resource definition . 34
5.3.2.3 Resource Standard Methods . 35
5.3.2.3.1 POST . 35
5.3.2.3.2 GET . 35
5.3.3 Resource: Individual PCF for a PDU Session Binding . 37
5.3.3.1 Description . 37
5.3.3.2 Resource definition . 37
5.3.3.3 Resource Standard Methods . 38
5.3.3.3.1 DELETE . 38
5.3.3.3.2 PATCH . 39
5.3.4 Resource: Binding Subscriptions . 40
5.3.4.1 Description . 40
5.3.4.2 Resource definition . 40
5.3.4.3 Resource Standard Methods . 41
5.3.4.3.1 POST . 41
5.3.4.4 Resource Custom Operations . 41
5.3.5 Resource: Individual Binding Subscription . 41
5.3.5.1 Description . 41
5.3.5.2 Resource definition . 42
5.3.5.3 Resource Standard Methods . 42
5.3.5.3.1 PUT . 42
5.3.5.3.2 DELETE . 43
5.3.5.4 Resource Custom Operations . 44
5.3.6 Void . 44
5.3.7 Resource: PCF for a UE Bindings . 44
5.3.7.1 Description . 44
5.3.7.2 Resource definition . 44
5.3.7.3 Resource Standard Methods . 44
5.3.7.3.1 POST . 44
5.3.7.3.2 GET . 45
5.3.8 Resource: Individual PCF for a UE Binding . 46
5.3.8.1 Description . 46
5.3.8.2 Resource definition . 46
5.3.8.3 Resource Standard Methods . 47
5.3.8.3.1 DELETE . 47
5.3.8.3.2 PATCH . 48
5.3.9 Resource: PCF for an MBS Session Bindings . 49
5.3.9.1 Description . 49
5.3.9.2 Resource definition . 49
5.3.9.3 Resource Standard Methods . 49
5.3.9.3.1 POST . 49
5.3.9.3.2 GET . 50
5.3.9.4 Resource Custom Operations . 51
5.3.10 Resource: Individual PCF for an MBS Session Binding . 51
5.3.10.1 Description . 51
5.3.10.2 Resource definition . 52
5.3.10.3 Resource Standard Methods . 52
5.3.10.3.1 PATCH . 52
5.3.10.3.2 DELETE . 53
5.3.10.4 Resource Custom Operations . 54
5.4 Custom Operations without associated resources. 54
5.5 Notifications . 54
5.5.1 General . 54
5.5.2 BSF Notification . 54
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5.5.2.1 Description . 54
5.5.2.2 Target URI . 54
5.5.2.3 Standard Methods . 55
5.5.2.3.1 POST . 55
5.6 Data Model . 56
5.6.1 General . 56
5.6.2 Structured data types . 57
5.6.2.1 Introduction . 57
5.6.2.2 Type PcfBinding . 58
5.6.2.3 Type PcfBindingPatch . 61
5.6.2.4 Type ParameterCombination. 61
5.6.2.5 Void. 62
5.6.2.6 Type BindingRe sp . 62
5.6.2.7 Type BsfSubscription . 63
5.6.2.8 Type BsfNotification . 64
5.6.2.9 Type BsfEventNotification . 64
5.6.2.10 Type PcfForUeBinding . 65
5.6.2.11 Type PcfForUeBindingPatch . 65
5.6.2.12 Type SnssaiDnnPair . 66
5.6.2.13 Type PcfForUeInfo . 66
5.6.2.14 Type PcfForPduSessionInfo . 67
5.6.2.15 Type PcfMbsBinding . 68
5.6.2.16 Type PcfMbsBindingPatch . 69
5.6.2.17 Void. 69
5.6.2.18 Type MbsBindingResp. 69
5.6.3 Simple data types and enumerations . 69
5.6.3.1 Introduction . 69
5.6.3.2 Simple data types . 69
5.6.3.3 Enumeration: BindingLevel . 69
5.6.3.4 Void. 70
5.6.3.5 Enumeration: BsfEvent . 70
5.6.4 Data types describing alternative data types or combinations of data types . 70
5.6.4.1 Type: BsfSubscriptionResp . 70
5.6.4.2 Type ExtProblemDetails . 70
5.6.4.3 Type MbsExtProblemDetails . 70
5.7 Error handling . 71
5.7.1 General . 71
5.7.2 Protocol Errors . 71
5.7.3 Application Errors . 71
5.8 Feature negotiation . 71
5.9 Security . 72
Annex A (normative): OpenAPI specification . 73
A.1 General . 73
A.2 Nbsf_Management API . 73
Annex B (informative): Deployment option to support BSF and DRA coexistence due to network
migration . 92
Annex C (informative): Change history . 93
History . 97

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Foreword
rd
This Technical Specification has been produced by the 3 Generation Partnership Project (3GPP).
The contents of the present document are subject to continuing work within the TSG and may change following formal
TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an
identifying change of release date and an increase in version number as follows:
Version x.y.z
where:
x the first digit:
1 presented to TSG for information;
2 presented to TSG for approval;
3 or greater indicates TSG approved document under change control.
y the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections,
updates, etc.
z the third digit is incremented when editorial only changes have been incorporated in the document.
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1 Scope
The present specification provides the stage 3 definition of the Binding Support Management Service of the 5G System.
The 5G System Architecture is defined in 3GPP TS 23.501 [2]. The stage 2 definition and related procedures for
Binding Support Management Service is specified in 3GPP TS 23.502 [3] and 3GPP TS 23.503 [4].
The 5G System stage 3 call flows are provided in 3GPP TS 29.513 [5].
The Technical Realization of the Service Based Architecture and the Principles and Guidelines for Services Definition
are specified in 3GPP TS 29.500 [6] and 3GPP TS 29.501 [7].
The Binding Support Management Service is provided by the Binding Support Function (BSF).
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
- References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
- For a specific reference, subsequent revisions do not apply.
- For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including
a GSM document), a non-specific reference implicitly refers to the latest version of that document in the same
Release as the present document.
[1] 3GPP TR 21.905: "Vocabulary for 3GPP Specifications".
[2] 3GPP TS 23.501: "System Architecture for the 5G System; Stage 2".
[3] 3GPP TS 23.502: "Procedures for the 5G System; Stage 2".
[4] 3GPP TS 23.503: "Policy and Charging Control Framework for the 5G System; Stage 2".
[5] 3GPP TS 29.513: "5G System; Policy and Charging Control signalling flows and QoS parameter
mapping; Stage 3".
[6] 3GPP TS 29.500: "5G System; Technical Realization of Service Based Architecture; Stage 3".
[7] 3GPP TS 29.501: "5G System; Principles and Guidelines for Services Definition; Stage 3".
[8] IETF RFC 9113: "HTTP/2".
[9] IETF RFC 8259: "The JavaScript Object Notation (JSON) Data Interchange Format".
[10] 3GPP TS 29.571: "5G System; Common Data Types for Service Based Interfaces Stage 3".
[11] OpenAPI: "OpenAPI Specification Version 3.0.0", https://spec.openapis.org/oas/v3.0.0.
[12] 3GPP TS 29.510: "5G System; Network Function Repository Services; Stage 3".
[13] IETF RFC 9457: "Problem Details for HTTP APIs".
[14] 3GPP TS 29.213: " Policy and Charging Control signalling flows and Quality of Service (QoS)
parameter mapping".
[15] 3GPP TS 33.501: "Security architecture and procedures for 5G system".
[16] IETF RFC 6749: "The OAuth 2.0 Authorization Framework".
[17] 3GPP TS 23.527: "5G System; Restoration Procedures".
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3GPP TS 29.521 version 19.6.0 Release 19 8 ETSI TS 129 521 V19.6.0 (2026-03)
[18] 3GPP TR 21.900: "Technical Specification Group working methods".
[19] 3GPP TS 23.316: "Wireless and wireline convergence access support for the 5G System (5GS)".
[20] IETF RFC 7396: "JSON Merge Patch".
[21] 3GPP TS 29.512: "5G System; Session Management Policy Control Service; Stage 3".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 [1] and the following
apply. A term defined in the present document takes precedence over the definition of the same term, if any, in
3GPP TR 21.905 [1].
3.2 Abbreviations
For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 [1] and the following apply. An
abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
3GPP TR 21.905 [1].
5G DDNMF 5G Direct Discovery Name Management Function
5G-RG 5G Residential Gateway
AF Application Function
AM Access and Mobility Management
BSF Binding Support Function
DNN Data Network Name
DRA Diameter Routing Agent
HTTP Hypertext Transfer Protocol
FN-RG Fixed Network Residential Gateway
FQDN Fully Qualified Domain Name
GPSI Generic Public Subscription Identifier
JSON JavaScript Object Notation HTTP Hypertext Transfer Protocol
MAC Media Access Control
MBSF Multicast/Broadcast Service Function
NEF Network Exposure Function
NRF Network Repository Function
NWDAF Network Data Analytics Function
PCF Policy Control Function
SMF Session Management Function
S-NSSAI Single Network Slice Selection Assistance Information
SUPI Subscription Permanent Identifier
TSCTSF Time Sensitive Communication and Time Synchronization Function
UDR Unified Data Repository
4 Binding Support Management Service
4.1 Service Description
4.1.1 Overview
The Binding Support Management Service as defined in 3GPP TS 23.502 [3] and 3GPP TS 23.503 [4], is provided by
the Binding Support Function (BSF).
The Nbsf_Management service is used to provide:
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- a PCF for a PDU session binding functionality, which ensures that a request for a certain PDU Session reaches
the relevant PCF holding that PDU Session information, or ensures that the same PCF is selected for multiple
PDU sessions.
- a PCF for an MBS session binding functionality, which ensures that for location-dependent MBS services, a
request for a certain MBS Session reaches the relevant PCF holding that MBS Session information.
- a PCF for a UE binding functionality, which ensures that a request for Access and Mobility related Policy
Authorization for a UE reaches the relevant PCF for a UE.
- Subscription to notification events about a newly registered or deregistered PCF for a UE or PCF for a PDU
session.
This service:
- allows NF service consumers to register, update and remove binding information;
- allows NF service consumers to retrieve binding information;
- allows NF service consumers to subscribe to notifications of registration/deregistration events of newly
registered or deregistered PCF for a UE or PCF for a PDU session.
4.1.2 Service Architecture
The 5G System Architecture is defined in 3GPP TS 23.501 [2]. The Policy and Charging related 5G architecture is also
described in 3GPP TS 23.503 [4] and 3GPP TS 29.513 [5].
The Binding Support Management Service (Nbsf_Management) is exhibited by the Binding Support Function (BSF).
The known consumers of the Nbsf_Management service are:
- Policy Control Function (PCF);
- Network Exposure Function (NEF);
- Application Function (AF);
- Multicast/Broadcast Service Function (MBSF);
- 5G Direct Discovery Name Management Function (5G DDNMF);
- Network Data Analytics Function (NWDAF); and
- Time Sensitive Communication and Time Synchronization Function (TSCTSF).
As described in 3GPP TS 23.503 [4], the BSF is a function that can be deployed standalone or as a functionality
provided by other network functions, such as PCF, UDR, NRF, SMF.
NOTE 1: The PCF accesses the Nbsf_Management service at the BSF via an internal interface when it is collocated
with BSF.
NOTE 2: The DRA decides to select a BSF based on user IP address range when the DRA has no binding
information for the subscriber to get the relevant PCF for a PDU session address. DRA and BSF
coexistence is described in 3GPP TS 29.513 [5], Annex A.
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BSF
Nbsf
Nbsf_Management service
5G
PCF NEF AF NWDAF TSCTSF MBSF
DDNMF
Figure 4.1.2-1: Reference Architecture for the Nbsf_Management service; SBI representation
NOTE 3: The PCF in the figure represents both, the PCF for a UE and the PCF for a PDU session. The PCF for a
UE and the PCF for a PDU session separately and independently register themselves at the BSF,
regardless they are deployed in the same NF instance or separately in different NF instances. In the case
of the PCF for a UE, the NF service consumer can be a V-PCF for a UE, which queries the BSF in the
HPLMN to discover and select the same H-PCF for the UE that is serving the UE in the HPLMN.
4.1.3 Network Functions
4.1.3.1 Binding Support Function (BSF)
The BSF:
- stores the binding information for a certain PDU Session;
- stores the binding information for a certain MBS Session;
- stores the binding information for a certain UE;
- enables the subscription to notifications of PCF for a PDU session registration/deregistration events;
- enables the subscription to notifications of PCF for a UE registration/deregistration events; and
- enables the discovery of binding information (e.g. the address information of the selected PCF for a PDU
session).
The BSF allows NF service consumers (e.g. PCF) to register, update and remove a binding information, and allows NF
service consumers (e.g. AF, NEF, NWDAF) to discover a binding information (e.g. the address information of the
selected PCF). The BSF also allows NF service consumers (e.g. PCF for a UE, AF, NEF) to subscribe to notifications
of PCF registration/deregistration events.
The BSF can be deployed standalone or collocated with other network functions, such as PCF, UDR, NRF and SMF.
4.1.3.2 NF Service Consumers
The Policy Control Function (PCF):
- The PCF for a PDU session:
a. registers binding information in the BSF for a UE when an IPv4 address and/or IPv6 prefix is allocated, or a
MAC address is used for the PDU session;
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b. updates binding information in the BSF when a UE address information is changed for the PDU Session; and
c. removes binding information in the BSF when an IPv4 address and/or IPv6 prefix is released, or a MAC
address is not used for the PDU Session; and
d. discovers the PCF for a UE in the BSF by using the Nbsf_Management_Discovery service operation.
- The PCF for an MBS session:
a. registers binding information in the BSF for an MBS session;
b. updates binding information in the BSF for the MBS session;
c. removes binding information in the BSF for the MBS session.
- The PCF for a UE:
a. registers binding information in the BSF for a UE when an AM/UE Policy Association is established;
b. updates binding information in the BSF when a new PCF instance for a UE is selected;
c. removes binding information in the BSF when the AM/UE Policy Association is terminated; and
d. subscribes with the BSF to notification of registration/deregistration events of the PCF for a PDU session;
and
e. (when it is a V-PCF for a UE) discovers the H-PCF for a UE by using the Nbsf_Management_Discovery
service operation.
The Network Exposure Function (NEF):
- provides means for the Application Functions to securely interact with the Policy framework for policy control
to 3GPP network. During the procedure, it needs to discover the selected PCF for a PDU session, the selected
PCF for an MBS Session (if applicable) or the selected PCF for a UE by using the Nbsf_Management_Discovery
service operation and the selected PCF for a UE by using the Nbsf_Management_Subscribe/Notify service
operations.
The Application Function (AF):
- discovers the selected PCF for a PDU session, the selected PCF for an MBS Session (if applicable) or the
selected PCF for a UE by using the Nbsf_Management_Discovery service operation and the selected PCF for a
UE by using the Nbsf_Management_Subscribe/Notify service operations when it is allowed to interact directly
with the policy framework for policy control.
The Network Data Analytics Function (NWDAF):
- discovers the selected PCF for a PDU session by using the Nbsf_Management_Discovery servi
...