Performance Comparison Between Two Kinds of Priority Schemes in Cognitive Radio Networks
In this paper, we consider a cognitive radio network with multiple Secondary Users (SUs). The SU packets are divided into SU1 packets and SU2 packets, and the SU1 packets have higher priority than the SU2 packets. Different from the conventional preemptive priority scheme (called Scheme I), we propose a non-preemptive priority scheme for the SU1 packets (called Scheme II) to guarantee the transmission continuity of the SU2 packets. By constructing a three-dimensional Markov chain, we give the transition probability matrix of the Markov chain, and obtain the steady-state distribution of the system model. Accordingly, we derive some performance measures, such as the interrupted rate of the SU1 packets and the interrupted rate of the SU2 packets. Lastly, we provide numerical experiments to compare the system performance between the two priority schemes.
KeywordsCognitive radio networks Preemptive priority Non-preemptive priority Markov chain
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