Reduction of Energy Consumption in Dynamic Spectrum Access in Wireless Sensor Networks using S-MAC

Abstract—This paper presents a simulation study of energy efficient WSNETs under Dynamic Spectrum Access. In wireless networks, a lot of bandwidth owned by the primary users goes unutilised. To acknowledge this problem, WSNETs can be implemented with dynamic spectrum allocation to use unutilised bandwidth opportunistically. We implemented and simulated a Time Division Multiple Access based energy efficient cognitive radio multichannel medium access control (MAC) protocol called S-MAC. A single channel Medium Access protocol does not perform well because of the multichannel hidden terminal problem. The S-MAC protocol handles this problem efficiently and allows secondary users to sense and utilise unused bandwidth. The proposed model is compared with IEEE 802.11 DCF. Extensive simulation results show that the model has a high network throughput and is energy efficient. The entire model is developed over Network Simulator 2.