Vehicular ad hoc network performs crucial function in road safety, detection of traffic accidents and reduction of traffic congestions by disseminating messages among vehicles. The periodic broadcasting is an efficient approach to serve the requests of many vehicles without selecting any route between source and destination. But it degrades the network performance due to hidden node problem and broadcasting storm problem. The present work is an on demand type of unicast pull based approach of data dissemination in vehicular ad hoc network. It disseminates data in the form of response message after receiving any query message from vehicle. The performance of the proposed scheme is evaluated in terms of block of service, loss of query messages due to time out, average required time of sending response messages to the vehicles and throughput.
Vehicular ad hoc network performs crucial functions in road safety, detection of traffic accidents and reduction of traffic congestions by allowing vehicles on roads to disseminate messages. Efficient message dissemination among authentic vehicles in vehicular ad hoc network is proposed in the present work. Each vehicle generates beacon message periodically and broadcasts it for neighbors. The emergency (warning) messages are generated by a vehicle after the occurrence of an emergency (warning) event within its coverage area. A vehicle transmits emergency (warning) message for its neighbors and receives emergency (warning) message from its neighbors in multiplexed form to utilize the available bandwidth efficiently and to reduce network congestion. The performance of the proposed scheme is evaluated qualitatively and quantitatively. It outperforms the existing schemes.
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