Dynamic Spectrum Access and Power Allocation for Cooperative Cognitive Radio Networks

Abstract—In the existing cooperative cognitive radio, primary users are generally assumed to be more than capable of supporting their target throughput, thereby the rate enhancement or the co-operation from secondary users actually has less attraction to pri-mary users. Instead, they might be more interested in the benefits in other format. This paper presents a new cooperative cognitive radio framework, where primary users are willing to cooperatively relay data for secondary users with their under-utilized resource to earn the revenue. An auction model with multiple auctioneers, multiple bidders and hybrid divisible/indivisible commodities is proposed to solve channel bands and cooperative transmit power competitions among secondary users. For maximizing the utility, secondary users can select receiving primary user’s assistance (i.e., work in cooperative transmission mode) and purchase both spec-trum and power from the primary user, or select direct transmis-sion mode and just buy spectrum from the primary user. Then, the convergence of the proposed auction scheme to a Walrasian equi-librium is mathematically proved. Finally, the performance of the proposed scheme is verified by the simulation results. Index Terms—Auction, cooperative cognitive radio, dynamic spectrum access, power allocation, Walrasian equilibrium. I