Proximity-services (ProSe) in 5G System (5GS) protocol aspects; Stage 3
The present document specifies the protocols for Proximity-based Services (ProSe) in 5G system as specified in 3GPP TS 23.304 [2] for:
a) 5G ProSe direct discovery;
b) 5G ProSe communication over the PC5 interface;
c) 5G ProSe-enabled UE-to-network relay; and
d) 5G ProSe-enabled UE-to-UE relay.
The present document defines the associated procedures for 5G ProSe service authorization, 5G ProSe direct discovery (e.g. the procedures between 5G ProSe-enabled UE and 5G Direct Discovery Name Management Function (DDNMF) over the PC3a interface, the procedures over the PC5 interface), 5G ProSe UE-to-network relay discovery, 5G ProSe UE-to-UE relay discovery and 5G ProSe direct communication.
The present document also defines the message format, message contents, error handling and system parameters applied by the protocols for ProSe in 5GS.