C-V2X is a technology introduced by 3gpp 4G standards and designed to allow vehicles to communicate with everything, i.e., other vehicles (V2V), pedestrians (V2P), infrastructure (V2I), and the cloud network (V2N). The technology uses cellular network infrastructure that is already providing service to UEs, with architectural enhancement. C-V2X defines two complementary transmission modes: Direct communication and Network-based communication. Direct communication, necessary for V2V and V2P, is based on the LTE device-to-device communication over the so-called PC5 interface and it can operate both under and out of the coverage of base stations. All other communication modes, instead, leverage the cellular network infrastructure (i.e., the LTE-Uu interface), and require a base station (i.e., an eNB) as inter mediator to communicate with an application server in the mobileoperator network or in the cloud network.V2X communication is intended to improve road and passenger safety, traffic efficiency and infotainment services.