Optimal Cooperative Sensing Order Using Inactive Secondary Users in Cognitive Radio Networks

A novel cooperative spectrum sensing order which utilizes inactive Secondary users (SUs) efficiently based on maximum throughput has been proposed in Cognitive radio networks (CRNs). In order to predict the states of Primary users (PUs), we build the PU's traffic pattern as a Continuous-time Markov chain (CTMC) process. CRNs obtain the maximum throughput while SUs sense the licensed channels with the optimal order. The numerical simulation results show that the proposed order based on spectrum sensing scheme can achieve larger channel utilization and lower sensing overhead as compared with the spectrum sensing scheme without using the optimal order sensing. After considering the report overhead of SUs, the optimal number of inactive SUs for the maximum throughput can be found.