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POSTER : Traffic-Adaptive Packet Relaying in VANET

It was noticed that in highway scenarios co-directional traffic consists of a collection of disconnected clusters. Since end-to-end connectivity between the sender and receiver is not guaranteed to exist, a car that stores a packet may have to carry it for a while, acting as a “data mule”, before a suitable next hop can be identified. We begin by offering a very simple analytical expression for the expected size of a cluster in co-directional traffic as a function of traffic density and radio transmission range. We then to develop a Traffic-Adaptive Packet Relaying protocol (TAPR) where each car uses a simple strategy to decide whether to use codirectional or oncoming traffic based on local traffic conditions. The performance of TAPR was evaluated by extensive simulation.