A demand based unicast data dissemination scheme in VANET

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.