Spectrum handoffs with mixed-priority queueing model over Cognitive Radio Networks

In this paper, we propose a mixed preemptive and non-preemptive resume priority (PRP/NPRP) M/G/1 queueing model for the modeling of the traffic in Cognitive Radio (CR) Networks with prioritized transmissions. A traffic-adaptive spectrum handoff scheme is then developed based on the proposed queueing model for delay sensitive applications. This spectrum handoff scheme reduces the delivery time of the delay-sensitive applications for secondary users (SUs) while ensuring the overall performance of the network by avoiding overly frequent spectrum handoff between SUs. In the experiment section, we compare with two recently proposed queueing models using the traffic-adaptive spectrum handoff scheme and show the superior performance of the proposed approach.