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Content for  TS 29.532  Word version:  17.3.0

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1  Scopep. 9

The present document specifies the stage 3 protocol and data model for the Nmbsmf Service Based Interface. It provides stage 3 protocol definitions and message flows, and specifies the API for each service offered by the MB-SMF with the exception of the MB-SMF Event Exposure service.
The 5G System stage 2 architecture and procedures are specified in TS 23.501 and TS 23.502. The 5G Multicast-Broadcast Session Management Services for 5G System is specified in TS 23.247.
The Technical Realization of the Service Based Architecture and the Principles and Guidelines for Services Definition are specified in TS 29.500 and TS 29.501.

2  Referencesp. 9

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.
TR 21.905: "Vocabulary for 3GPP Specifications".
TS 23.501: "System Architecture for the 5G System; Stage 2".
TS 23.502: "Procedures for the 5G System; Stage 2".
TS 29.500: "5G System; Technical Realization of Service Based Architecture; Stage 3".
TS 29.501: "5G System; Principles and Guidelines for Services Definition; Stage 3".
OpenAPI: "OpenAPI Specification Version 3.0.0",
TR 21.900: "Technical Specification Group working methods".
TS 33.501: "Security architecture and procedures for 5G system".
RFC 6749:  "The OAuth 2.0 Authorization Framework".
TS 29.510: "5G System; Network Function Repository Services; Stage 3".
RFC 7540:  "Hypertext Transfer Protocol Version 2 (HTTP/2)".
RFC 8259:  "The JavaScript Object Notation (JSON) Data Interchange Format".
RFC 7807:  "Problem Details for HTTP APIs".
TS 23.247: "Architectural enhancements for 5G multicast-broadcast services; Stage 2".
RFC 6902:  "JavaScript Object Notation (JSON) Patch".
TS 29.281: "General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U)".
TS 29.571: "5G System; Common Data Types for Service Based Interfaces; Stage 3".
TS 29.274: "3GPP Evolved Packet System (EPS); Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C); Stage 3".
TS 38.413: "NG Radio Access Network (NG-RAN); NG Application Protocol (NGAP)".
RFC 2387:  "The MIME Multipart/Related Content-type".
RFC 2045:  "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies".
TS 29.537: "5G System; Multicast/Broadcast Policy Control Services; Stage 3".
TS 29.214: "Policy and Charging Control over Rx reference point".

3  Definitions, symbols and abbreviationsp. 10

3.1  Definitionsp. 10

For the purposes of the present document, the terms and definitions given in TR 21.905 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905.
For the definitions of the basic SBI notions (e.g. apiRoot, API URI, Callback URI, etc.), SBI specific abbreviations (e.g. CRUD, YAML, etc.), special characters, operators and delimiters that are used by SBI specifications, see clause 3 in TS 29.501.

3.2  Abbreviationsp. 10

For the purposes of the present document, the abbreviations given in TR 21.905 and the following apply. An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in TR 21.905.
5G Multicast-Broadcast Services
Application Function / Application server
Access and Mobility Management Function
Common Tunnel Endpoint IDentifier
Data Network Name
Frequency Selection Area
Fully Qualified TEID (i.e. IP address and TEID)
GTP User plane
Multicast/Broadcast Service
Multicast/Broadcast Service Function
Multicast/Broadcast Service Transport Function
Multicast/Broadcast Session Management Function
Multicast/Broadcast User Plane Function
Network Exposure Function
Network Function
Next Generation (5G) RAN
Session Management Function
Single Network Slice Selection Assistance Information
Tunnel Endpoint IDentifier
Temporary Mobile Group Identity
User Plane Function
Uniform Resource Identifier

4  Overviewp. 11

4.1  Introductionp. 11

Within the 5GC, the MB-SMF offers services to the SMF, AMF, AF/AS, MBSF and NEF via the Nmbsmf service based interface (see TS 23.501, TS 23.502 and TS 23.247).
Figure 4.1-1 provides the reference model (in service based interface representation and in reference point representation), with focus on the MB-SMF and the scope of the present specification.
Copy of original 3GPP image for 3GPP TS 29.532, Fig. 4.1-1: Reference model - MB-SMF
Figure 4.1-1: Reference model - MB-SMF
(⇒ copy of original 3GPP image)
N11mb is the reference point between MB-SMF and AMF.
N16mb is the reference point between MB-SMF and SMF.
N29mb is the reference point between MB-SMF and NEF.
Nmb1 is the reference point between MB-SMF and MBSF.
Nmb13 is the reference point between MB-SMF and AF/AS.
The functionalities supported by the MB-SMF are listed in clause of TS 23.247.

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