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Cognitive radio networks significantly improve spectrum utilization efficiency by allowing unlicensed users to opportunistically access the unused licensed spectrum. One of the key challenges is to determine how to properly assign the unused spectrum slots without impacting the licensed users and if necessary, move the existing users to different spectrum bands. In this paper, we present a spectrum migration model and propose a simulated annealing approach to determine the proper spectrumdoi:10.1186/1687-1499-2013-200 fatcat:pezbolvtejbctid5f5oymofzwu