4 General

24.3863GPPProtocol aspectsRelease 17Stage 3TSUser Equipment (UE) to V2X control function

4.1 Overview

The present specification specifies means for transport of V2X messages. V2X messages are generated and consumed by upper layers of the UE and the V2X application server. V2X messages can contain IP data or non-IP data.

The V2X messages can be transported using:

– V2X communication over PC5; and

– V2X communication over LTE-Uu.

V2X communication over PC5 enables transfer of V2X messages among UEs. For V2X messages containing IP data, only IPv6 is used. IPv4 is not supported in this release of the specifications.

V2X communication over LTE-Uu enables transfer of V2X messages between a UE and a V2X application server. V2X messages are carried over LTE-Uu in payload of a UDP/IP packet or via a TCP connection. A UE using V2X communication over LTE-Uu:

– can use unicast transport (in uplink, downlink or both of them);

– can use MBMS transport (in downlink only);

– can use transport for uplink which is the same or different to the transport for downlink; and

– can use also MBMS transport for downlink without using any transport for uplink.

The communication security over the V3 interface and LTE-Uu interface is specified in 3GPP TS 33.185 [20]. The communication security and privacy over the PC5 interface is specified in 3GPP TS 33.185 [20].

NOTE: ProSe charging specified in 3GPP TS 24.334 [4] is expected to be usable for V2X communication over PC5, although no V2X specific procedures for charging are specified in this release.