ABSTRACT
In Vehicular ad hoc networks road safety and traffic management applications required stable communication
channel with minimum disturbances. In vanets vehicles used bandwidth to forward packets towards destination
with the help of relay nodes. While exchanging information there are chances of collisions due to improper
bandwidth allocation in a network. Some applications such as safety and traffic management required consistent
channel conditions. However the design of an efficient medium access control (MAC) is a challenging task due to
dynamic topology changes. The existing cluster based TDMA MAC protocols used traffic loads for bandwidth
allocation in such a manner position of vehicle in the cluster is not considered. As part of that, vehicles located at
end of cluster region can request for channel, as consequence the cluster head (CH) allocates bandwidth based on
traffic loads. In this case vehicles are not in a stage to use total reserved slot allocated for usage, because in short
span vehicles move to next cluster region, it shows inefficient allocation of channel. In this paper we proposed an
efficient approach for allocation of bandwidth which depends on vehicle position in cluster. Here vehicles at
starting position can get more bandwidth when compare to end position vehicles. The simulation shows position
based bandwidth allocation where the channel is allocated based on effective and reduces collisions as result
improves overall network performance.
Keywords: - Vanets, collision free, cluster and position based MAC, QoS, and Queue theory