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Cognitive Radio (CR) technology enables Secondary Users (SUs) to transparently utilize the licensed spectrum bands while causing limited interference to Primary Users (PUs). In this paper, a distributed routing and time-slot assignment (DRTSA) algorithm is proposed to addess the PU protection issue. Specifically, we first design a proper routing metric for distributed path selection and then we propose a time-slot assignment algorithm to improve SUs' capacity and reduce the interference to PU as well. Theoretical analysis shows that the complexity of DRTSA is no more than O(NTlogN), where N and T denote the number of nodes and the time-slot period in the network respectively. Simulation results show that, under various network scenarios, the performance of the proposed distributed algorithm can approach that of the centralized alternatives.
Date of Conference: 8-10 Aug. 2012