A cross-layer protocol of spectrum mobility and handover in cognitive LTE networks |
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Authors: | Yuh-Shyan Chen Ching-Hsiung Cho Ilsun You Han-Chieh Chao |
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Affiliation: | 1. Department of Computer Science and Information Engineering, National Taipei University, Taipei, Taiwan, ROC;2. School of Information Science, Korean Bible University, South Korea;3. Institute of Computer Science & Information Engineering, National Ilan University, I-Lan, Taiwan, ROC;4. Department of Electronic Engineering, National Ilan University, I-Lan, Taiwan, ROC;5. Department of Electrical Engineering, National Dong Hwa University, Hualien, Taiwan, ROC;1. University of Liverpool, Liverpool, UK;2. Åbo Akademi University, Turku, Finland;3. University of Turku, Turku, Finland;1. Inria Lille-Nord Europe, Villeneuve d’Ascq, France;2. Roma Tre University, Rome, Italy |
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Abstract: | Cognitive radio technique is the next step toward efficient wireless bandwidth utilization. While some of the spectrum bands (unlicensed band) have been increasingly used, most of the other spectrum resources (licensed band) are underutilized. This drives the challenges of open spectrum and dynamic spectrum access concepts, which allows unlicensed users (or called secondary users, SUs) equipped with cognitive radios to opportunistically access the spectrum not used by licensed users (or called primary users, PUs). Most existing results mainly focus on designing the lower-layer cognitive radio problems. In the literature, this is the first result to investigate the higher-layer solution for cognitive radio networks. In this paper, we present a cross-layer protocol of spectrum mobility (layer-2) and handover (layer-3) in cognitive LTE networks. With the consideration of the Poisson distribution model of spectrum resources, a cross-layer handoff protocol with the minimum expected transmission time is developed in cognitive LTE networks. Performance analysis of the proposed handoff protocol is investigated. Finally, simulation results illustrates the proposed handoff protocol significantly reduces the expected transmission time and the spectrum mobility ratio. |
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