System and method of vehicular wireless communication

The system and method of carrying out vehicles wireless communications via a dedicated-short-range-communications service band. There are vehicles equipped with the navigation means, a processing unit, and a means of communication that carries out message transmission via a wireless communications link. There is a service channel for communication the control channel for safety traffic, and except safety. A control channel is re-divided during [which was equipped with the service section except the non-competing period equipped with the safe exchange section, and safety] the competition. An access point communicates with vehicles via a communication link in a domain. Vehicles judge in the area within communication, if it is the area within communication, a method is judged, and current time judges whether vehicles are registered to an access point in the inside of the safe exchange section, and it carries out safety traffic transmission from each registration vehicles in the safe exchange section about each registration vehicles at predetermined time. The safety traffic exchange by all the registration vehicles judges in a completion settled, if it is completion settled, vehicles are made to leave a control channel, current time judges within a competition period, and if current time is within a competition period, communication is transmitted except safety.