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Sensors 2016, 16(7), 1127; doi:10.3390/s16071127

Spectrum Handoffs Based on Preemptive Repeat Priority Queue in Cognitive Radio Networks

Communication Research Center, Harbin Institute of Technology, Harbin 150080, China
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Author to whom correspondence should be addressed.
Academic Editor: Leonhard M. Reindl
Received: 29 May 2016 / Revised: 16 July 2016 / Accepted: 18 July 2016 / Published: 20 July 2016
(This article belongs to the Section Sensor Networks)
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Abstract

Cognitive radio can significantly improve the spectrum efficiency, and spectrum handoff is considered as an important functionality to guarantee the quality of service (QoS) of primary users (PUs) and the continuity of data transmission of secondary users (SUs). In this paper, we propose an analytical framework based on a preemptive repeat identical (PRI) M/G/1 queuing network model to characterize spectrum handoff behaviors with general service time distribution of both primary and secondary connections, multiple interruptions and transmission delay resulting from the appearance of primary connections. Then, we derive the close-expression of the extended data delivery and the system sojourn time in both staying and changing scenarios. In addition, based on analysis of spectrum handoff behaviors resulting from multiple interruptions caused by the appearance of the primary connections, we investigate the traffic-adaptive policy, by which the considered SU will optimally adjust its handoff spectrum policy. Moreover, we investigate the admissible region and provide the reference for designing the admission control rule for the arriving secondary connection requests. Finally, simulation results verify that our proposed analytical framework is reasonable and can provide the reference for executing the optimal spectrum handoff strategy and designing the admission control rule for the SU in cognitive radio networks. View Full-Text
Keywords: cognitive radio networks; spectrum handoff; sojourn time; preemptive repeat priority queuing; extended data delivery time; admission control cognitive radio networks; spectrum handoff; sojourn time; preemptive repeat priority queuing; extended data delivery time; admission control
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Yang, X.; Tan, X.; Ye, L.; Ma, L. Spectrum Handoffs Based on Preemptive Repeat Priority Queue in Cognitive Radio Networks. Sensors 2016, 16, 1127.

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