Fading aware MAC (FAMAC) protocol for mobile adhoc network

In this paper a new MAC protocol called FAMAC is proposed. This protocol has been designed keeping in view the impact of both small scale and large scale fading environments. Whenever the transmission process encounters a small scale fading environments such as rayleigh or ricean, the action is taken to retransmit the RTS control signal expecting the improvement of the communication environment. In case of large scale fading, the transmission power is increased under the assumption that the communicating environment will remain approximately same in the near future. By using ns2 simulator, performance of FAMAC the proposed MAC protocol is compared with the two other most widely used MAC protocol DCF & EDCF. Avg. end-to-end delay and throughput are taken as the performance measure for the purpose. It was observed that the proposed FAMAC protocol shows improved results in comparison to DCF & EDCF. FAMAC shows higher throughput and lesser avg. delay in comparison to other MAC protocols. It was also observed that in FAMAC, the throughput and avg. and-to-end delay remains unaffected by various fading environment. But in DCF and EDCF, those are affected by Rayleigh and Ricean fading environment.