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Sensors 2017, 17(12), 2818; https://doi.org/10.3390/s17122818

Dynamic Spectrum Access for Internet of Things Service in Cognitive Radio-Enabled LPWANs

Department of Computer Science and Engineering, Dongguk University-Seoul, 30 Pildong-ro 1 gil, Jung-gu, Seoul 04620, Korea
Received: 16 October 2017 / Revised: 16 November 2017 / Accepted: 29 November 2017 / Published: 5 December 2017
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Abstract

In this paper, we focus on a dynamic spectrum access strategy for Internet of Things (IoT) applications in two types of radio systems: cellular networks and cognitive radio-enabled low power wide area networks (CR-LPWANs). The spectrum channel contention between the licensed cellular networks and the unlicensed CR-LPWANs, which work with them, only takes place within the cellular radio spectrum range. Our aim is to maximize the spectrum capacity for the unlicensed users while ensuring that it never interferes with the licensed network. Therefore, in this paper we propose a dynamic spectrum access strategy for CR-LPWANs operating in both licensed and unlicensed bands. The simulation and the numerical analysis by using a matrix geometric approach for the strategy are presented. Finally, we obtain the blocking probability of the licensed users, the mean dwell time of the unlicensed user, and the total carried traffic and combined service quality for the licensed and unlicensed users. The results show that the proposed strategy can maximize the spectrum capacity for the unlicensed users using IoT applications as well as keep the service quality of the licensed users independent of them. View Full-Text
Keywords: IoT; cognitive radio; dynamic spectrum access; matrix geometric solution; mean dwell time; carried traffic IoT; cognitive radio; dynamic spectrum access; matrix geometric solution; mean dwell time; carried traffic
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Moon, B. Dynamic Spectrum Access for Internet of Things Service in Cognitive Radio-Enabled LPWANs. Sensors 2017, 17, 2818.

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