In Ad-hoc wireless networks, the basic 802.11 Media Access Control (MAC) protocol uses the distributed coordination function (DCF) to share the medium between multiple devices. But the uses of 802.11 MAC protocol in an Ad - hoc network are affected by various issues such as limited power capacity, packet losses due to transmission errors, a lot of control traffic and inability to avoid packet collision. To resolve these issues many protocols have been developed. But we have not found any efficient protocol, which can solve the power management, packet collision and packet loss issues efficiently. In this paper, we propose a new protocol that adjusts the upper and lower bounds of the contention window to reduce the number of collisions. It also uses a power control scheme, triggered by the MAC layer to limit the packet loss, energy wastage and decrease the number of collisions. The proposed protocol has been implemented and its
performance is compared with the existing 802.11 MAC protocol. We calculated the packet delivery fraction, average (e-e) delay, average throughput and packet losses in various situations. We found our proposed protocol is fairly better than the existing protocol.
Ad-hoc network, MAC protocol, Power Control Scheme, Contention Window