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• W2919103684 abstract "In channel-hopping (CH)-based distributed cognitive radio networks (CRNs), the time duration that secondary users (SUs) spend for establishing communication links is called access delay. To evaluate access delay, we propose an access delay model by jointly considering imperfect spectrum sensing and multi-channel multi-SU transmission, from the cross-layer perspective. The model considers two typical scenarios. The first scenario assumes that the SUs do not use contention scheme (CS) which indicates that the time slot is relatively shorter to just allow a transmission. The second scenario assumes that the SUs employ CS [i.e., modified Distributed Coordination Function (DCF)-based Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) in this paper], which indicates that the time slot is long enough to regulate multiple transmissions. We then propose a bio-inspired algorithm for the first scenario and a self-adaptive step-length algorithm for the second scenario to search for the optimal values of spectrum sensing parameters. The theoretical analysis and simulation results validate the proposed access delay model and show that the proposed algorithms can reduce the most redundant computation. They also show that the optimization of cross-layer parameters can significantly decrease SUs' access delay. Moreover, we conduct a cost-benefit analysis to evaluate the performance of the two scenarios." @default.
• W2919103684 created "2019-03-11" @default.
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• W2919103684 date "2019-07-01" @default.
• W2919103684 modified "2023-10-03" @default.
• W2919103684 title "Cross-Layer Analysis and Optimization on Access Delay in Channel-Hopping-Based Distributed Cognitive Radio Networks" @default.
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• W2919103684 doi "https://doi.org/10.1109/tcomm.2019.2903112" @default.
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