Universal Mobile Telecommunications System (UMTS); LTE; Proximity-services (ProSe) User Equipment (UE) to ProSe function protocol aspects; Stage 3 (V12.4.0; 3GPP TS 24.334 version 12.4.0 Release 12)
The present document specifies the protocols for Proximity-based Services (ProSe) between: - the ProSe-enabled UE and the ProSe Function (over the PC3 interface); and - two ProSe-enabled UEs (over the PC5 interface). The present document defines the associated procedures for ProSe service authorisation@ ProSe direct discovery@ EPClevel ProSe discovery and ProSe direct communication. The present document also defines the message format@ message contents@ error handling and system parameters applied by the protocols for ProSe. The present document is applicable to: - the ProSe-enabled UE; and - the ProSe Function. In this release of the specification@ ProSe direct discovery is supported only when the UE is served by E-UTRAN.