Abstract

Secondary users, which base on the spectrum pricing function given by primary users, can compete the spectrum resource with each other through game theory in cognitive radio system. It can be divided into cooperative game and noncooperative game according to whether the secondary users cooperate or not in the spectrum sharing. In this paper, based on the Nash bargaining in cooperative game, an improved utility function is proposed to maximize the profit product of all the secondary users. The cooperative game algorithm of spectrum allocation in cognitive radio is found and the priority of secondary users is introduced. We prove the existence and uniqueness of NBS (Nash Bargaining Solution) for the new utility in cooperative game. The simulation results show that the new algorithm can reflect the secondary users' priorities of spectrum allocation by setting the parameters properly and make sure the spectrum allocation becomes more efficient and fair.

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