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Multi-layer based multi-path routing algorithm for maximizing spectrum availability

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Abstract

Last 2 decades have witnessed the spectrum resources scarcity which is caused by wireless networks’ ubiquitous applications. To utilize the rare spectrum resources more efficiently, Cognitive Radio (CR) technology has been developed as a promising scheme. However, in CR networks, a novel NP-Hard disjoint multi-path routing problem has been encountered due to the Primary Users’ (PUs’) random movements. To settle this problem, we present a Spectrum History Matrix mechanism to define long-term spectrum sensing information on time-spectrum level such that spectrum availability and communication efficiency can be quantized in CR networks. To lessen the possibility for an active PU to interrupt all paths simultaneously, a sub-optimal Multi-layer based Multi-path Routing Algorithm (MMRA) is provided to determine how to route multiple paths which are not under the same PUs’ interference ranges. Through theoretical and simulation analyses, MMRA can not only settle the disjoint multi-path routing problem in polynomial time complexity, but also maximize communication efficiency.

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Acknowledgments

This research is supported by National Natural Science Foundation of China (Grant Nos. 51305319 and 61672395), International Science & Technology Cooperation Program of China (Grant No. 2015DFA70340), and Wuhan Chengguang Youth Science and Technology Program (Grant No. 2014072704011247).

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Correspondence to Duzhong Zhang.

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Zhang, D., Liu, Q., Chen, L. et al. Multi-layer based multi-path routing algorithm for maximizing spectrum availability. Wireless Netw 24, 897–909 (2018). https://doi.org/10.1007/s11276-016-1377-x

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  • DOI: https://doi.org/10.1007/s11276-016-1377-x

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