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IEEE 802.22 standard utilizes cognitive radio (CR) techniques to allowsharing unused spectrum band. The cognitive radio is vulnerable to variousattacks such as jamming attacks. This paper has focused on coordinated jammingattacks. A simple strategy for secondary users is to change their bands andswitch to other appropriate bands when the jamming attack is occurred. Also,the malicious users should switch to other bands in order to jam the secondaryusers. To address this problem, a game theoretical method is proposed toanalyze coordinated jamming attacks in CR. Then, using Nash equilibrium on theproposed game, the most appropriate bands have been found to switch as well asthe optimal switching probabilities for both secondary and malicious users.Meanwhile, effects of different parameters like the number of malicious usersare investigated in changing the optimal switching probabilities by analysis onthe model.

Game-theory-based analysis on interactions among secondary and malicious users in coordinated jamming attack in cognitive radio systems