Abstract: This paper proposed a Stackelberg game-based model for spectrum pricing and allocation in orthogonal frequency division multiple access(OFDMA) cognitive radio networks.With this model,the primary base station(PBS) can obtain the optimal pricing solution in the scenario where secondary base station(SBS) controls the transmission power of the secondary network to protect the primary network transmission.We redesigned the utility function of secondary user (SU) with the consideration of power control,and formulated the trade behaviors in spectrum leasing market,in which a single PBS acts as a seller and multi-SUs act as buyers,by a Stackelberg game model.Using backward induction,we solved the optimal pricing at market equilibrium with which the PBS can maximize its profit under QoS constraints.Besides,considering that limited information is available locally at the PBS,we presented a distributed dynamic Stackelberg game-based spectrum pricing and allocation model.Simulation results demonstrate that this model can obtain the optimal spectrum pricing and allocation scheme with controlling the secondary network transmission power under the interface threshold of the primary network.

Key words: Cognitive radio,Spectrum leasing,Stackelberg game,Power control,Spectrum pricing