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Energy Efficient Routing By Choosing Alternate Path Selection in Cognitive Radio Networks

T.Lamana, K.Karthikeyan

Spectrum efficiency and energy efficiency are two critical issues for wireless communication networks. In the past years, much effort has been made to enhance capacity of wireless communication networks via various technologies such as cognitive radio. Meanwhile, cognitive radio has emerged as a promising paradigm to improve the spectrum usage efficiency and cope with spectrum scarcity problem through dynamically detecting and re-allocating white spaces in licensed radio band to unlicensed users. In order to achieve this requirement, alternate path selection routing in cognitive radio networks is proposed that saves the energy by efficiently selecting the energy efficient path in the routing process. It investigates how a CR user senses multiple channels and determines the optimal transmission duration and power allocation. When performing optimization, take energy efficiency, throughput, and interference with the primary users into consideration and find a closed-form solution for transmission duration for chosen channels. It is shown that the proposed optimization approach significantly improves energy efficiency and throughput of CR networks. The proposed work is simulated through the NS2 Simulator.