Research On Spectrum Lease Strategy In Cognitive Wireless Networks

Cognitive radio technology allows cognitive users to actively detect and make rational use of idle spectrum resources,alleviating the increasingly tense spectrum resources.This paper mainly studies spectrum lease policies in two cooperative cognitive radio networks(CCRN).Under these two strategies,primary users recruit secondary users without autho-rized spectrum resources to help them transmit data,and on the other hand,increase the transmission rate or utility of primary users,on the other hand,the secondary users without spectrum resources have the opportunity to access the spectrum and achieve the purpose of improving the utilization of spectrum resources.The specific work of this article is as follows:1.A spectrum lease strategy in CCRN is proposed.This strategy only considers that the primary and secondary users only have a single antenna.In this strategy,all secondary users can only through help the primary user to transmit data,enabling the primary user to terminate the data transmission early to win the spectrum access opportunity to transmit their own data.The main idea of this spectrum lending strategy is:the primary user allo-cates the remaining spectrum resources that each secondary user can occupy according to the pricing given by the secondary user,and uses the pricing given by the secondary user as a constraint to construct primary and secondary user utilities.The value is the goal of the optimization problem,through the game theory to analyze the utility of the primary user and the secondary user,and solve the optimal strategy.Simulation results show that this spectrum rental strategy can effectively improve the utility of primary and secondary users.2.A spectrum lease strategy in MIMO-CCRN is proposed.Different from the previ-ous spectrum lease strategy,this strategy considers single-antenna primary users and dual-antenna secondary users.This strategy uses the secondary user transmission power as a constraint to maximize the primary user transmission rate and secondary user utility.S-tackelberg game is used to model this problem,and the unique Nash equilibrium point is solved and used as the optimal strategy for this problem.The simulation results verify that the primary user transmission rate and secondary user utility under this strategy have been improved.