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Content for  TS 29.526  Word version:  17.6.0

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1  Scopep. 8

The present document specifies the stage 3 protocol and data model for the Nnssaaf Service Based Interface. It provides stage 3 protocol definitions and message flows, and specifies the API for each service offered by the NSSAAF.
The 5G System stage 2 architecture and procedures are specified in TS 23.501 and TS 23.502.
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. 8

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".
RFC 4648:  "The Base16, Base32 and Base64 Data Encodings".
TS 29.503: "5G System; Unified Data Management Services; Stage 3".
TS 29.518: "5G System; Access and Mobility Management Services; Stage 3".
TS 29.536: "5G System; Network Slice Admission Control Services; Stage 3".

3  Definitions, abbreviationsp. 9

3.1  Definitionsp. 9

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.

3.2  Abbreviationsp. 9

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.
Network Slice-Specific Authentication and Authorization
Network Slice-specific and SNPN Authentication and Authorization Function
Standalone Non-Public Network

4  Overviewp. 9

4.1  Introductionp. 9

Within the 5GC, the NSSAAF offers services to the AMF and the AUSF via the Nnssaaf service-based interface.
The AMF shall make use of the NSSAAF service when it needs to invoke network slice-specific authentication and authorization for a specific UE and a specific S-NSSAI (see TS 23.502, clause, and TS 33.501, clause 16.2 and TS 33.501, clause 16.3).
The NSSAAF service shall also be used by the AMF to receive slice re-authentication notification or slice authorization revocation notification sent from the AAA-S (see TS 23.502, clause, TS 23.502, clause and TS 33.501, clause 16.3 and TS 33.501, clause 16.4).
The AUSF shall make use of the NSSAAF service when it needs to invoke a primary authentication in SNPN with Credentials holder using AAA server; the AUSF shall also make use of this service during the UE onboarding procedure in SNPN scenarios, when the Default Credentials Server (DCS) uses an AAA server for primary authentication.
Figure 4.1-1 provides the reference model with focus on the NSSAAF.
Copy of original 3GPP image for 3GPP TS 29.526, Fig. 4.1-1: Reference model - NSSAAF
Figure 4.1-1: Reference model - NSSAAF
(⇒ copy of original 3GPP image)

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