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Sustainability 2018, 10(6), 1764; https://doi.org/10.3390/su10061764

Sum Utilization of Spectrum with Spectrum Handoff and Imperfect Sensing in Interweave Multi-Channel Cognitive Radio Networks

Department of Information and Communication Engineering, Yeungnam University, Gyeongsan 38541, Korea
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Received: 1 May 2018 / Revised: 18 May 2018 / Accepted: 21 May 2018 / Published: 28 May 2018
(This article belongs to the Special Issue 5G Mobile Services and Scenarios: Challenges and Solutions)
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Abstract

Fifth-generation (5G) heterogeneous network deployment poses new challenges for 5G-based cognitive radio networks (5G-CRNs) as the primary user (PU) is required to be more active because of the small cells, random user arrival, and spectrum handoff. Interweave CRNs (I-CRNs) improve spectrum utilization by allowing opportunistic spectrum access (OSA) for secondary users (SUs). The sum utilization of spectrum, i.e., joint utilization of spectrum by the SU and PU, depends on the spatial and temporal variations of PU activities, sensing outcomes, transmitting conditions, and spectrum handoff. In this study, we formulate and analyze the sum utilization of spectrum with different sets of channels under different PU and SU co-existing network topologies. We consider realistic multi-channel scenarios for the SU, with each channel licensed to a PU. The SU, aided by spectrum handoff, is authorized to utilize the channels on the basis of sensing outcomes and PU interruptions. The numerical evaluation of the proposed work is presented under different network and sensing parameters. Moreover, the sum utilization gain is investigated to analyze the sensitivities of different sensing parameters. It is demonstrated that different sets of channels, PU activities, and sensing outcomes have a significant impact on the sum utilization of spectrum associated with a specific network topology. View Full-Text
Keywords: 5G networks; cognitive radio; interweave; sum utilization of spectrum; spectrum handoff; spatial and temporal variations 5G networks; cognitive radio; interweave; sum utilization of spectrum; spectrum handoff; spatial and temporal variations
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Khalid, W.; Yu, H. Sum Utilization of Spectrum with Spectrum Handoff and Imperfect Sensing in Interweave Multi-Channel Cognitive Radio Networks. Sustainability 2018, 10, 1764.

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