24.5543GPPProximity-services (ProSe) in 5G System (5GS) protocol aspectsRelease 17Stage 3TS
The present document specifies the protocols for Proximity-based Services (ProSe) in 5G system as specified in 3GPP TS 23.304  for:
a) 5G ProSe direct discovery;
b) 5G ProSe communication over the PC5 interface; and
c) 5G ProSe UE-to-network relay.
The present document defines the associated procedures for 5G ProSe service authorization and configuration, 5G ProSe direct discovery, 5G ProSe direct communication, and 5G ProSe UE-to-network relay.
The present document also defines the message format, message contents, error handling and system parameters applied by the protocols for ProSe in 5GS.