Policies for Scheduling Primary and Secondary users in Cognitive Radio Network using Game Theory

Abstract

Cognitive Radio Network consists of Secondary Users (SUs) and Primary Users (PU). Primary Users are the licensed owners of the band, which will lease a part of band to the Secondary Users. Thus the Secondary Users can transmit opportunistically whenever the queue of PU is empty. The Secondary Users can cooperate with the Primary Users when the queue is busy, so that the success probability of Primary Users will be increased. Thus Secondary Users need to take intelligent decision on whether to cooperate or not. Imperfect sensing finds out any false sensing in the channel. However it fails to find an optimal solution in spectral sensing, when channel sensing errors are considered. In order to overcome this problem, a robust game theoretic framework is used for Dynamic Spectrum Access (DSA) management over multiple channels for spectrum sharing between PU and SUs. It improves expected utility maximization and it is less complex. However it may have delay in retransmission of SUs as they send aggressively. To solve the retransmission delays, a power trading mechanism is introduced. Thus it improves the efficiency of the CRN by limiting the time and power usage.