Abstract
In order to reduce the average delay of secondary user (SU) packets and adapt to various tolerance for transmission interruption, in this paper, we propose a novel opportunistic channel access mechanism in cognitive radio networks (CRNs). Considering the preemptive priority of primary user (PU) packets, as well as the sensing errors caused by SUs, we can model the network system as a priority queue with two classes of packets, however, these two classes of packets may interfere with each other. We first analyze the stationary distribution of the queueing model, then we derive the expression for the throughput of SU packets. Finally, we provide numerical experiments to optimize the energy sensing threshold with a maximum throughput of SU packets.
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