Position Based Broadcast Mechanism for Inter-Vehicle Cooperative Warning

Broadcast is widely used in Vehicle Ad Hoc Networks (VANET) to send emergent messages to the surrounding vehicles. However, with the increase of the broadcast messages, the possibility of conflicts between messages will rise dramatically, leading to a larger delivery latency or loss. A position based broadcast mechanism for inter-vehicle cooperative warning (P-BM) used in VANET is proposed in this paper. There are two strategies in P-BM, one is curb strategy which is used to reduce the redundancy, and the other one is forwarding strategy which uses the position of the vehicles to choose the next suitable forwarding node. Simulation results show that P-BM can efficiently reduce the number of the broadcast messages and enhance the promptness of message delivery, resulting in the decrease of latency and collision between vehicles.