4 General description

24.5873GPPProtocol aspectsRelease 16Stage 3TSVehicle-to-Everything (V2X) services in 5G System (5GS)

The present specification defines means for transport of V2X messages in 5GS and interworking to EPS. 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:

a) V2X communication over PC5; and

b) V2X communication over Uu.

For case a above:

1) V2X communication over PC5 enables transfer of V2X messages among UEs;

2) both IP based and non-IP based V2X messages are supported over PC5; and

3) for V2X messages containing IP data, only IPv6 is used. IPv4 is not supported in this release of the specification.

For case b above:

1) V2X communication over Uu enables transfer of V2X messages between a UE and a V2X application server;

2) both IP based and non-IP based V2X messages are supported over Uu;

3) V2X messages are carried over Uu in payload of either a UDP/IP packet or TCP/IP packet towards a V2X application server address;

NOTE: Further details about the use of UDP or TCP as a transport layer protocol are described in 3GPP TS 23.287 [3] clause 5.2.3.1.

4) V2X messages carried over Uu are sent or received over unicast only in this release of the specification; and

5) V2X messages are carried over Uu using user data via user plane.