1 Scope

29.5623GPP5G SystemHome Subscriber Server (HSS) servicesRelease 18Stage 3TS

The present document specifies the stage 3 protocol, including message flows and API specification details, for the Nhss services, as part of the 5G Service-Based Architecture, offered by the HSS.

The HSS services specified in the present document include:

– Services for interworking with the IP Multimedia Subsystem (IMS)

– Services for interworking with the Generic Bootstrapping Architecture (GBA)

NOTE: The HSS services for Interworking with the Unified Data Management (UDM) Network Function are specified in 3GPP TS 29.563 [39].

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

The IP Multimedia Subsystem (IMS) stage 2 architecture and procedures are specified in 3GPP TS 23.228 [6].

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 stage 2 architecture and procedures of SBA-enabled GBA is specified in 3GPP TS 33.220 [40] and 3GPP TS 33.223 [41].