An efficient multi-channel MAC protocol for wireless adhoc networks

Abstract— IEEE 802.11 MACis designed for single channel and based on Carrier Sense Multiple Ac-cess with Collision Avoidance (CSMA/CA). The throughput of network is limited by the Bandwidth of the single channel and the CSMA-based MAC protocol with omni directional antennas can cause the serious unfairness or flow starvation. By exploiting the multiple channels and using the directional antennas, nodes located in each other’s vicinity may communicate simultaneously. This helps to increase the spatial reuse of the wireless channel and thus increase the network performance. A Multi-channel MAC protocol with Directional Antennas (MMAC-DA) that adopts IEEE 802.11 Power Saving Mechanism(PSM) and exploits multiple channel resources and directional antennas. Nodes have to exchange control packets during the Announcement Traffic Indication Message(ATIM) window to select data channels and determine the beam directions which are Used to exchange data packets during the data window. The simulation results show that MMAC-DA can improve the network performance in terms of aggregate throughput, packet delivery ratio, energy efficiency and fairness index. < final year projects >