ETSI TS 129 521 V16.7.0 (2021-04)

5G; 5G System; Binding Support Management Service; Stage 3 (3GPP TS 29.521 version 16.7.0 Release 16)

ETSI TS 129 521 V16.7.0 (2021-04)

Name:ETSI TS 129 521 V16.7.0 (2021-04)   Standard name:5G; 5G System; Binding Support Management Service; Stage 3 (3GPP TS 29.521 version 16.7.0 Release 16)
Standard number:ETSI TS 129 521 V16.7.0 (2021-04)   language:English language
Release Date:   technical committee:3GPP CT 3 - Interworking with external networks (formely CN3)
Drafting committee:   ICS number:
ETSI TS 129 521 V16.7.0 (2021-04)






TECHNICAL SPECIFICATION
5G;
5G System;
Binding Support Management Service;
Stage 3
(3GPP TS 29.521 version 16.7.0 Release 16)



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3GPP TS 29.521 version 16.7.0 Release 16 1 ETSI TS 129 521 V16.7.0 (2021-04)

Reference
RTS/TSGC-0329521vg70
Keywords
5G

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3GPP TS 29.521 version 16.7.0 Release 16 2 ETSI TS 129 521 V16.7.0 (2021-04)
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3GPP TS 29.521 version 16.7.0 Release 16 3 ETSI TS 129 521 V16.7.0 (2021-04)
Contents
Intellectual Property Rights . 2
Legal Notice . 2
Modal verbs terminology . 2
Foreword . 5
1 Scope . 6
2 References . 6
3 Definitions and abbreviations . 7
3.1 Definitions . 7
3.2 Abbreviations . 7
4 Binding Support Management Service . 7
4.1 Service Description . 7
4.1.1 Overview . 7
4.1.2 Service Architecture . 8
4.1.3 Network Functions . 8
4.1.3.1 Binding Support Function (BSF) . 8
4.1.3.2 NF Service Consumers . 9
4.2 Service Operations . 9
4.2.1 Introduction. 9
4.2.2 Nbsf_Management_Register Service Operation . 9
4.2.2.1 General . 9
4.2.2.2 Register a new PCF Session binding information . 10
4.2.3 Nbsf_Management_Deregister Service Operation . 12
4.2.3.1 General . 12
4.2.3.2 Deregister an individual PCF Session binding information . 12
4.2.4 Nbsf_Management_Discovery Service Operation . 13
4.2.4.1 General . 13
4.2.4.2 Retrieve the PCF Session binding information for a given tuple . 13
4.2.5 Nbsf_Management_Update Service Operation. 14
4.2.5.1 General . 14
4.2.5.2 Update an existing PCF Session binding information . 14
5 Nbsf_Management Service API . 15
5.1 Introduction . 15
5.2 Usage of HTTP . 16
5.2.1 General . 16
5.2.2 HTTP standard headers . 16
5.2.2.1 General . 16
5.2.2.2 Content type . 16
5.2.3 HTTP custom headers . 16
5.2.3.1 General . 16
5.3 Resources . 16
5.3.1 Resource Structure . 16
5.3.2 Resource: PCF Session Bindings . 17
5.3.2.1 Description . 17
5.3.2.2 Resource definition . 17
5.3.2.3 Resource Standard Methods . 18
5.3.2.3.1 POST . 18
5.3.2.3.2 GET . 18
5.3.3 Resource: Individual PCF Session Binding . 19
5.3.3.1 Description . 19
5.3.3.2 Resource definition . 19
5.3.3.3 Resource Standard Methods . 20
5.3.3.3.1 DELETE . 20
5.3.3.3.2 PATCH . 21
ETSI

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3GPP TS 29.521 version 16.7.0 Release 16 4 ETSI TS 129 521 V16.7.0 (2021-04)
5.4 Custom Operations without associated resources. 22
5.5 Notifications . 22
5.6 Data Model . 22
5.6.1 General . 22
5.6.2 Structured data types . 23
5.6.2.1 Introduction . 23
5.6.2.2 Type PcfBinding . 24
5.6.2.3 Type PcfBindingPatch . 26
5.6.2.4 Type ParameterCombination. 27
5.6.2.5 Type ExtProblemDetails . 27
5.6.2.6 Type BindingRe sp . 27
5.6.3 Simple data types and enumerations . 27
5.6.3.1 Introduction . 27
5.6.3.2 Simple data types . 27
5.6.3.3 Enumeration: BindingLevel . 28
5.7 Error handling . 28
5.7.1 General . 28
5.7.2 Protocol Errors . 28
5.7.3 Application Errors . 28
5.8 Feature negotiation . 28
5.9 Security . 29
Annex A (normative): OpenAPI specification . 30
A.1 General . 30
A.2 Nbsf_Management API . 30
Annex B (informative): Deployment option to support BSF and DRA coexistence due to
network migration . 37
Annex C (informative): Change history . 38
History . 41

ETSI

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3GPP TS 29.521 version 16.7.0 Release 16 5 ETSI TS 129 521 V16.7.0 (2021-04)
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.
ETSI

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3GPP TS 29.521 version 16.7.0 Release 16 6 ETSI TS 129 521 V16.7.0 (2021-04)
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 7540: "Hypertext Transfer Protocol Version 2 (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 3.0.0 Specification", https://github.com/OAI/OpenAPI-
Specification/blob/master/versions/3.0.0.md.
[12] 3GPP TS 29.510: "5G System; Network Function Repository Services; Stage 3".
[13] IETF RFC 7807: "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".
ETSI

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3GPP TS 29.521 version 16.7.0 Release 16 7 ETSI TS 129 521 V16.7.0 (2021-04)
[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-RG 5G Residential Gateway
AF Application Function
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
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
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 a PDU session binding functionality, which ensures that an AF
request for a certain PDU Session reaches the relevant PCF holding that PDU Session information.
This service:
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3GPP TS 29.521 version 16.7.0 Release 16 8 ETSI TS 129 521 V16.7.0 (2021-04)
- allows NF service consumers to register, update and remove binding information; and
- allows NF service consumers to retrieve binding information.
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); and
- Network Data Analytics Function (NWDAF)
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 address. DRA and BSF coexistence is described in
3GPP TS 29.513 [5], Annex A.
BSF
Nbsf
Nbsf_Management service
PCF NEF AF NWDAF

Figure 4.1.2-1: Reference Architecture for the Nbsf_Management service; SBI representation
4.1.3 Network Functions
4.1.3.1 Binding Support Function (BSF)
The BSF:
- stores the binding information for a certain PDU Session; and
- enables the discovery of binding information (e.g. the address information of the selected PCF).
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 can be deployed standalone or collocated with other network functions, such as PCF, UDR, NRF and SMF.
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3GPP TS 29.521 version 16.7.0 Release 16 9 ETSI TS 129 521 V16.7.0 (2021-04)
4.1.3.2 NF Service Consumers
The Policy Control Function (PCF):
- 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;
- updates binding information in the BSF when a UE address information is changed for the PDU Session; and
- 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.
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 by using the
Nbsf_Management_Discovery service operation.
The Application Function (AF):
- discovers the selected PCF by using the Nbsf_Management_Discovery service operation when it is allowed to
interact directly with the policy framework for policy control.
The Network Data Analytics Function (NWDAF):
- discovers the selected PCF by using the Nbsf_Management_Discovery service operation.
4.2 Service Operations
4.2.1 Introduction
Table 4.2.1-1: Operations of the Nbsf_Management Service
Service operation name Description Initiated by
Nbsf_Management_Register This service operation is used to register the binding NF service consumer
information for a UE when an IPv4 address and/or an (PCF)
IPv6 prefix is allocated for an IP PDU Session or a MAC
address is used for an Ethernet PDU session.
Nbsf_Management_Deregister This service operation is used to deregister the binding NF service consumer
information for a UE. (PCF)
Nbsf_Management_Discovery This service operation is used by an NEF or AF or NF service consumer
NWDAF to discover a selected PCF. (NEF, AF, NWDAF)
Nbsf_Management_Update This service operation is used to update an existing NF service consumer
session binding information for a UE (i.e. UE address(es) (PCF)
for a PDU Session).

4.2.2 Nbsf_Management_Register Service Operation
4.2.2.1 General
This service operation allows a NF service consumer (e.g. PCF) to register the session binding information for a UE in
the BSF by providing the user identity, the DNN, the UE address(es) and the selected PCF address for a certain PDU
Session to the BSF, and BSF stores the information.
If the BindingUpdate feature is not supported and the NF service consumer (e.g. PCF) receives a new UE address (e.g.
IPv6 prefix) and has already registered session binding information
...

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