4 General description

24.4863GPPProtocol aspectsRelease 17Stage 3TSVehicle-to-Everything (V2X) Application Enabler (VAE) layer

The UE can contain a VAE client (VAE-C). The VAE-C communicates with the VAE server (VAE-S) over the V1-AE interface (see 3GPP TS 23.286 [4]). Furthermore, the VAE-C of a UE can communicate with the VAE-C of another UE over the V5-AE interface (see 3GPP TS 23.286 [4]). Both the VAE-C and the VAE-S can act as an HTTP client or an HTTP server (see IETF RFC 7230 [24]). The HTTP protocol interactions are described in detail in clause 6 and 7.

The VAE layer supports UEs in the LTE-Uu communication range assigning a ProSe Layer-2 Group ID for application layer V2X dynamic group formation (on-network dynamic group creation procedure as defined in clause 6.10).

Additionally, the VAE layer supports UEs in assigning a ProSe Layer-2 Group ID for application layer V2X dynamic group formation (off-network dynamic group creation procedure as defined in clause 6.10).

By means of using the V1-AE interface:

a) V2X UE registration and de-registration towards the VAE-S can be provided as defined by clause 6.2 and 6.3;

b) application level location tracking can be provided as defined by clause 6.4;

c) V2X message delivery can be provided as defined by clause 6.5;

d) V2X service discovery information can be provided as defined by clause 6.6;

e) V2X service continuity can be provided as defined by clause 6.7;

f) dynamic local service information for V2X service continuity can be obtained as defined by clause 6.8;

g) network monitoring by the V2X UE can be provided as defined by clause 6.9;

h) V2X USD provisioning can be provided as defined by clause 7.2; and

i) PC5 parameters provisioning can be provided as defined by clause 7.3.