Abstract:

As for the problems faced by message dissemination in vehicle ad hoc networks under the urban environment, a reliable broadcast algorithm is proposed. Firstly，the nodes are classified into certain classes based on the node position and movement direction. A distancebased scheme is applied to select an appropriate relay node, by which a multihop broadcast is realized. At the intersection, the nodes are further divided into two types. As to the problem of communication connection holes, we solve it by carrying and forwarding. The node needs to detect a hole, and then rebroadcasts when a node enters its communication range. The simulation results show that our algorithm has good performance in the delay, success percentage and average load generated by each broadcast packet.

Key words: ITS;vehicle adhoc network;broadcast