1 Scope

29.5573GPP5G SystemApplication Function ProSe ServiceRelease 18Stage 3TS

The present document specifies the stage 3 protocol and data model for the Application Function ProSe Service of the 5G System. It provides stage 3 protocol definitions and message flows, and specifies the API for the Naf_ProSe service.

The 5G System stage 2 architecture and procedures are specified in 3GPP TS 23.501 [2], 3GPP TS 23.502 [3] and 3GPP TS 23.304 [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 Application Function ProSe Service is provided by the Application Function (AF). This service supports 5G ProSe Direct Discovery authorization.