An Adaptive Energy Efficient Model for wireless Ad Hoc Networks

Several transmit power control MAC protocols have been designed primarily to reduce the energy consumption in wireless ad hoc networks. On the other hand, many adaptive rate MAC protocols have been mainly proposed to improve the network throughput. Recently, very few MAC protocols have been suggested by combining the transmit power control and adaptive rate in one algorithm. In this paper, we proposed a new energy efficient MAC protocol for the Distributed Coordination Function (DCF) IEEE 802.11b based ad hoc networks which also maximizes the overall network throughput. We call this protocol s Traffic Sensing adaptive Rate Power (TSRP) control MAC protocol. In our technique, the MAC protocol selects the best ratepower combination for each data frame which can achieve the required Signal to Noise Ratio (SNR) at the receiver, maximize throughput and save energy. The basic idea of the TSRP protocol is that rather than just matching the channel condition, the sender sense outgoing traffic based on the traffic load and the queue condition. We have simulated the TSRP MAC protocol for two different scenarios – single flow single hop and two source two flows. The simulation results show that TSRP saves more energy saving and achieves higher throughput than IEEE 802.11b. Key-Words:Adaptive rate, Ad hoc Networks, MAC protocol, power control, TSRP, IEEE 802.11 DCF.