Exploring the technology: C-V2X
Cellular-V2X (C-V2X) as initially defined as LTE V2X in 3GPP Release 14 is designed to operate in several modes.
It provides one solution for integrated V2V, V2I and V2P operation with V2N by leveraging existing cellular network infrastructure:
- Device-to-device  is Vehicle-to-Vehicle (V2V), Vehicle-to-(Roadway) Infrastructure (V2I) and Vehicle-to-Pedestrian (V2P) direct communication without necessarily relying on network involvement for scheduling.
- Device-to-cell tower is another communications link which enables network resources and scheduling and utilizes existing operator infrastructure. Device-to-cell tower communications constitute at least part of the V2I proposition and are important to end-to-end solutions.
- Device-to-network is the V2N solution using traditional cellular links to enable cloud services to be part and parcel of the end-to-end solution.
In the device-to-device mode (V2V, V2I, V2P) operation, C-V2X does not necessarily require any network infrastructure. It can operate without a SIM, without network assistance and uses GNSS as its primary source of time synchronization.
C-V2X also supports V2N applications utilising existing cellular networks where other voices and data communications occur. V2N would deliver network assistance and commercial services requiring the involvement of a Mobile Network Operator (MNO).
Collectively, the transmission modes of shorter-range direct communications (V2V, V2I, V2P) and longer-range network-based communications (V2N) comprise what we call Cellular-V2X .
 Relies on the PC5 interface specified by 3GPP for device-to-device operation.
 See 3GPP TR 22.885 Study on LTE Support for Vehicle to Everything (V2X) Services.
Immerse yourself in the possibilities
The C-V2X technology is set to revolutionise the mobility ecosystem and the way drivers interact with the world. It is essential to redefining transportation by providing real-time, highly reliable, and actionable information flows to enable safety, mobility and environmental applications.
The 5GAA perspective is that C-V2X, will be key to achieving the level of connectivity required for V2X communication, and it is set to be a disruptive force in the automotive market.
C-V2X Testing and Deployment
An aggressive validation testing schedule is already underway globally: more than 13 trials are currently being implemented including 9 in Europe.
C-V2X is ready for deployment with commercial chipsets set for 2018. The start of in-vehicle commercial deployment (i.e. type-approved vehicles) foreseen for 2020/2021 globally.