Vehicle to vehicle (V2V), vehicle to network (V2N), vehicle to infrastructure (V2I), and vehicle to pedestrians (V2P) which are also represented as V2X Communications are one of the biggest technology breakthroughs and perhaps the next big thing in the transportation industry. The V2X communications is currently designed to be implemented by the Long-Term Evolution (LTE) network, however this technology may soon be designed to be implemented by 5G. Transportation is fundamental to quality of life and economic growth and the key benefits from V2X communications are increased safety, enhanced traffic flow, and efficient gas consumption.
V2X and V2I where I stands for infrastructure and is shown here as the traffic light increase traffic awareness through distributing precise knowledge of traffic situation across the entire road network. This helps drivers to choose the best route and leads to less traffic congestion.
At high speed and high density, direct communications of V2V, V2P, and V2I, with no network involvement enables better handling of latency sensitive services such as collision avoidance than do indirect communications with network involvement.
The broadcast feature of V2X supports wide area communications, by leveraging leveraging the existing LTE network. Latency-tolerant information such as the notification that an accident occurred a few miles ahead, can be broadcasted by a V2X server to vehicles, pedestrians, and infrastructures (shown as a traffic light). The vehicles, pedestrians, and infrastructures send V2X messages to the V2X server via a unicast bearer.
V2X is resistant to significant Doppler shift and frequency offset caused by high relative speeds due to employing the enhanced LTE sidelink channels. Synchronization and channel estimation are improved for the V2X technology by increasing the number of reference signal symbols.
V2X communications allows control signal and data traffic transmitted on the same subframe to reduce in-band emission. V2X enables an efficient resource allocation by employing new sensing methods and semi-persistent resource scheduling.
Connected communications among vehicles enhances traffic flow which in return results in gas efficiency. Reduction of gas consumption benefits both the environment and the economy.
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