An auction-theoretic spectrum leasing scheme for cognitive radio networks

In recent years, Dynamic spectrum leasing (DSL) strategies are studied as a new paradigm for dynamic spectrum sharing (DSS) in cognitive radio networks (CRN's). In traditional spectrum leasing model, the cooperative Secondary Users (SUs) use higher power to transmit their own packets but a lower power to relay the packets of primary user. On the other hand, many existing research work can be characterized by a model with one Primary User (PU) and multiple SUs, or alternatively, the model with multiple PUs and one SU. The optimal results from these studies are only either in favor of PUs or in favor of SUs. This paper proposes a novel spectrum leasing model, in which a PU leases its vacant bandwidth for a fraction of time to the SUs in exchange for its cooperation. We consider the modeling of dynamic spectrum sharing in the market with multiple strategic PUs and SUs. In this new model, it is assumed that SUs use the same power to transmit their own packets and relay the packets of PUs. The SUs can adapt their transmitting power according to the spectrum competition results. Moreover, we study the optimization of the spectrum leasing in terms of not only the utility of secondary network, or the utility of primary network, but also the utility of the entire network including Pus and SUs. Finally, the simulation results validate the satisfied performance of the proposed spectrum leasing scheme.