4 General

24.3343GPPProximity-services (ProSe) User Equipment (UE) to ProSe function protocol aspectsRelease 17Stage 3TS

4.1 Overview

Proximity-based Services (ProSe) are services that can be provided by the 3GPP system based on UEs being in proximity to each other. In this release of the document, the 3GPP system enablers for ProSe include the following functions:

– ProSe direct discovery (using E-UTRA or WLAN technology);

– ProSe direct communication;

– EPC-level ProSe discovery; and

– EPC support for WLAN direct discovery and communication.

Among the above functions, ProSe direct discovery and EPC-level ProSe Discovery is applicable for both Public Safety UE and non-Public Safety UE. ProSe direct communication is applicable for Public Safety UE only.

In this release of the document, the stand-alone procedure for EPC support for WLAN direct discovery and communication is not supported.

The communication security over the PC3 interface is specified in 3GPP TS 33.303 [6]. The communication security over the PC3ch interface is the same as communication security over the PC3 interface specified in 3GPP TS 33.303 [6].