Admissible evidence: Trustworthy cooperative spectrum sensing based on Dempster-Shafer theory in cognitive radio networks

Cognitive radio (CR) is a promising technology which improves the spectrum utilization. Cooperative spectrum sensing (CSS) has been adopted to exploit spatial diversity in cognitive radio networks (CRNs). Since CSS is subject to attacks from malicious users, several secure schemes have been proposed recently. But, they only utilize current information to estimate the reliability of secondary users. In this paper, we propose a trustworthy CSS scheme based on Dempster-Shafer theory. It evaluates the trustworthiness degree of each user with two indicators, which are the current reliability and the historical reputation. Besides, it takes advantage of Dempster-Shafer theory´s ability to reflect uncertainty in the evaluation as well. Simulation results have shown that the proposed scheme is effective to counter with different attacks patterns.