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Enhancing throughput in multi-radio cognitive radio networks

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Abstract

In recent years, cognitive radio networks (CRNs) have been widely investigated to solve the well-known spectrum scarcity problem through enhancing spectrum utilization. Another technique of enhancing spectrum utilization, which has already been well accepted, is to utilize multiple radios on a single node. Simultaneous usage of both these techniques is, therefore, expected to enhance the spectrum utilization further in road to improving overall network performance. However, little research efforts have been spent on investigating performance of the simultaneous usage through incorporating multiple radios in each node of a CRN. Existing studies in this regard propose several protocols for multi-radio cognitive radio networks (MRCRNs). However, none of them focuses on enhancing throughput in the network to the best of our knowledge. Nonetheless, increased network throughput should be a direct consequence of enhanced spectrum utilization through exploiting multiple radios in CRNs, even though an existing study (Khan et al., in: 2015 IEEE 11th international conference on wireless and mobile computing, networking and communications (WiMob), IEEE, pp 370–377, 2015) reports getting decreased network throughput while introducing multiple radios in each node of a CRN. Thus, a specialized treatment to the multiple radios in each node of a CRN is needed for enhancing network throughput. Accordingly, in this study, we propose a feedback-based multi-radio exploitation approach for MRCRNs, where information obtained from lower layers (Physical layer and Data Link layer) is incorporated in the process of decision making in an upper layer (Application layer) to enhance network throughput. We implement our proposed approach in the network simulator ns-3 to evaluate different performance metrics including network throughput, average end-to-end delay, and average packet drop ratio. We compare the performance against that of existing multi-radio exploitation approaches for CRNs. Our simulation results reveal that our proposed feedback-based approach always achieves substantially increased network throughput compared to the existing approaches, in parallel to achieving improved delay and packet drop-ratio in most of the cases.

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Authors and Affiliations

  1. Department of CSE, Bangladesh University of Engineering and Technology, Dhaka, Bangladesh

    Tanvir Ahmed Khan & A. B. M. Alim Al Islam

  2. Electrical Engineering and Computer Science (EECS) Department, University of Michigan, Ann Arbor, USA

    Tanvir Ahmed Khan

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  1. Tanvir Ahmed Khan
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  2. A. B. M. Alim Al Islam
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Correspondence to A. B. M. Alim Al Islam.

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Khan, T.A., Islam, A.B.M.A.A. Enhancing throughput in multi-radio cognitive radio networks. Wireless Netw 25, 4383–4402 (2019). https://doi.org/10.1007/s11276-019-02103-6

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