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This paper provides an asymptotic analysis of the steady-state queue length distribution of Secondary Users (SUs) for Dynamic Spectrum Access (DSA) networks. Specifically, two network scenarios are investigated. In the first scenario where each SU has its exclusive access to a Primary User (PU) channel, it is shown that if either the PU traffic or the SU traffic is heavy tailed, the queue length of the SU is one order heavier than the one with the heavier tail. In the second scenario where multiple SUs share a single PU channel, the throughput optimal queue-length based scheduling policies are studied.
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