scope:

The present document specifies the stage 3 protocol and data model for the UAS-specific Naf Service Based Interface. It provides stage 3 protocol definitions and message flows, and specifies the API for each service offered by the UAS-specific AF.

The 5G System stage 2 architecture and procedures are specified in 3GPP TS 23.501 [2], 3GPP TS 23.502 [3], and 3GPP TS 23.256 [14].

The Technical Realization of the Service Based Architecture and the Principles and Guidelines for Services Definition are specified in 3GPP TS 29.500 [4] and 3GPP TS 29.501 [5].

The UAS Service Supplier (USS) provides the UAS-specific AF services to NF service consumers (e.g. NEF (UAS-NF)). The USS is functionality within the AF.