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In this paper a Discrete-Time Markov Chain (DTMC) framework is adopted to capture the effect of flexible spectrum channelization for the opportunistic access of Secondary Users (SUs) in a primary-secondary shared spectrum scenario. Two implementation alternatives are proposed: a Fixed Channelization Scheme (FCS) and an Adaptive Channelization Scheme (ACS). Moreover, service-type characterization of SUs is also addressed by defining time vs. volume based services. Results indicate the suitability of the ACS over the FCS.
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