Research Of Vehicles Conflict Measure And Dynamic Slot Allocation

In recent years ,the number of vehicles on the roads has been increasing tremendously with the rapid development of the automotive industry and the improvement of people's living standard in our country. This higher traffic density is making traffic safety a challenge. Many academics have suggested that Wireless technology could provide a safe and secure driving environment through inter-vehicle communication. Inter-vehicle communication systems, where vehicles exchange information with each other, have become an important facilitator to decrease traffic accidents and improve capacity of highways.Our main objective of this thesis is to measure the conflict risk and then on the basis of this risk allocate the slots for future communication. These vehicles can either be moving in the same direction or in other directions (opposite or different). In this system all the vehicles are equipped with a transceiver, Global Navigation Satellite System (GNSS) receiver, a communication processor and a database. The transceiver is used for transmitting and receiving broadcast messages to and from the other nearby vehicles. The GNSS is used for the calculation of the vehicle's own location, direction and to get accurate time information from GPS signals. The communication processor is responsible for all the communication and efficient utilization of shared radio resource. The database storage will maintain the history of the degree of the conflict risk involved between the two vehicles. The radio channel is shared among all the vehicles and each vehicle is capable of sending messages containing its location, direction and speed information to the other nearby vehicles in its vicinity. After receiving these messages other vehicles in the broadcast domain of first vehicle will calculate the degree of the risk for possible conflict. For the data transmission the vehicles will use a variant of SOTDMA technique in which slot reservation is based on the priority set by the calculated degree of conflict risk, so that the traffic efficiency of road will be improved and the traffic accident will be reduced.