Performance Analysis of Spectrum Sharing Mechanisms in Cognitive Radio Networks
In this paper, a Non-Preemptive (NP) mechanism is proposed to improve the Quality-of-Service (QoS) of Secondary Users (SUs) in joint leasing and sensing-based Cognitive Radio Networks (CRNs). In this spectrum-sharing mechanism, a Primary User (PU) could not forcibly terminate a SU with ongoing transmission. Both the typical preemptive and the proposed NP mechanisms are modeled by multi-dimensional Markov chains with three state variables. A decomposition-approximated method is used to derive the closed-form solutions of the steady-state probabilities in the Markov chains.