Coordinate Assigning Contention Window in Ad Hoc Network

In wireless ad hoc network, every node has to share channels among multiple contending nodes for sending packet. Ad hoc network does not have centralized scheduler for decision node to send packets. Medium access control (MAC) protocol will control packet sending. However, when the traffic in network is high the performance of MAC protocol will be degraded. In this paper we will propose an efficient contention resolution algorithm for wireless ad hoc network by using some information from next node to assign the new contention window. We also propose two new backoff procedures for reducing the waiting time before sending packet, namely, double random backoff algorithm (DRB) and fast decreasing backoff (FDB). These algorithms attempt to provide significantly higher throughput performance for data services than the IEEE 802.11 MAC algorithm. We demonstrate this algorithm indeed reduces the idle slots more effectively