A new MAC protocol based on ad hoc vehicle communication system is proposed. The protocol adopts a combination of competition and reservation to effectively solve the problems of hidden and exposed terminals. The simulation results show that the protocol can ensure that nodes can access the channel quickly and reliably, and is insensitive to the network scale. With the development of vehicle communication systems and the gradual maturity of mobile ad hoc network technology, many developed countries have begun to apply mobile ad hoc network technology to vehicle communication systems and study vehicle communication systems based on mobile ad hoc networks. The vehicle communication system based on ad hoc networks is a decentralized and autonomous ad hoc network spontaneously formed by the communication equipment on each vehicle. By quickly and reliably exchanging real-time information such as safety, traffic, and entertainment between vehicles, it improves driving safety, comfort, and road use efficiency, and meets passengers\' needs for various information. Its basic idea is to transmit its own location information and data obtained by vehicle sensors to other vehicles, but this information is not generally useful, but should be forwarded to drivers who are helpful to their journey.
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