The present document specifies the protocols: - for V2X authorization between the UE and the V2X control function (over the V3 interface); - for V2X communication among the UEs (over the PC5 interface); and - for V2X communication between the UE and the V2X application server (over the LTE-Uu interface). The present document defines the associated procedures for V2X authorization and V2X communication. The present document also defines the message format@ message contents@ error handling and system parameters applied by the protocols for V2X. The present document is applicable to: - the UE; - the V2X control function; and - the V2X application server.