An analytical framework for cooperative cognitive radio network for spectrum leasing/sharing

In Cognitive Radio Network (CRN), secondary users (SUs) opportunistically access the channel licensed by the Primary User (PU). Recently there has been growing interest in cooperative cognitive communication, spectrum leasing, and spectrum sharing techniques. These techniques have potential to substantially improve the system utilization of CRN as a whole. In this paper, we develop an elaborate and accurate queueing model for the cooperative channel access mechanisms in CRN. Using the proposed model we derive the queue length distribution of PU, as well as SU and the mean sojourn time of PU, as well as SU. We study the effect of mean arrival time of PU, mean arrival and service time of SU on the derived performance metrics. Through extensive simulation we validate the analytical model. Our analysis brings out the trade-off between the throughput of SU and transmission delay of the PU. Our results offer insight to the design engineer to optimally fix the system parameters of the CRN.