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Performance analysis and optimization of cognitive radio networks with retransmission control

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Abstract

In usual cognitive radio networks with buffer settings, secondary user packets that are interrupted by primary user packets will return to the SU buffer for later retransmission. But this may increase the average delay of the SU packets. In this paper, we propose a novel spectrum sharing strategy (SSS) to dynamically control the retransmission of the SU packets by introducing a returning threshold and a returning probability. This will simultaneously guarantee the Quality of Service for the SUs. In this SSS, when the transmission of an SU packet is interrupted, if the number of SU packets already in SU buffer reaches a returning threshold that is set in advance as a system parameter, an interrupted SU packet is admitted to return to the SU buffer with a dynamic returning probability. This returning probability is inversely proportional to the total number of packets in the system. Based on the SSS with retransmission control proposed in this paper, we build a discrete-time preemptive priority queueing model to comply with digital nature of modern networks. Accordingly, by presenting and analyzing a two-dimensional discrete-time Markov chain that represents the system state transition, we obtain the steady-state distribution of the system and then provide the formulas for several system performance measures. Moreover, with numerical results, we show the influence of the returning threshold on different performance measures. Finally, by building a net benefit function, we optimize the system performance for the returning threshold to balance different system performance measures.

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Acknowledgements

This work was supported in part by the Fundamental Research Funds for the Central Universities (No. N152303007), the Scientific Research Fund of Hebei Education Department (No. QN2016307), the Natural Science Foundation of Hebei Province (No. F2016501073), the Doctoral Scientific Research Foundation of Liaoning Province (No. 201601016) and the Doctoral Foundation of Northeastern University at Qinhuangdao (No. XNB201606), China, and was supported in part by MEXT, Japan.

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Zhao, Y., Yue, W. Performance analysis and optimization of cognitive radio networks with retransmission control. Optim Lett 12, 1281–1300 (2018). https://doi.org/10.1007/s11590-017-1119-8

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