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Performance study of a CSMA based multiuser MAC protocol for cognitive radio networks: analysis of channel utilization and opportunity perspective

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Abstract

In the overlay medium access control (MAC) of cognitive radio networks, secondary user (SU) uses the spectrum portion which is assigned to primary user (PU), when PU is not using this spectrum at that time. In this article, a multiuser overlay MAC protocol is considered in which PUs and SUs are using time division multiple access and carrier sense multiple access (CSMA) MAC schemes, respectively. Firstly, new frame format and algorithm for the proposed MAC protocol are described, then the analytical modelling of this protocol is explained. In the SU network, Markov chain model along with the CSMA protocol is used for better utilization of the opportunity from the PU network (PUN). Channel utilization and probability of success are also derived and analyzed for this protocol with respect to idle time, collision (failure) time, various spectrum opportunities from PUN, number of SUs, and their fairness. This MAC scheme provides the optimal solution for channel utilization under a constraint on the probability of collisions. Numerical results are also provided to validate analysis of proposed MAC protocol and to investigate the performance behaviour of the optimal solution.

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Authors and Affiliations

  1. Department of ICT, ABV-Indian Institute of Information Technology and Management, Gwalior, India

    Lokesh Chouhan & Aditya Trivedi

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  1. Lokesh Chouhan
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  2. Aditya Trivedi
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Correspondence to Lokesh Chouhan.

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Chouhan, L., Trivedi, A. Performance study of a CSMA based multiuser MAC protocol for cognitive radio networks: analysis of channel utilization and opportunity perspective. Wireless Netw 22, 33–47 (2016). https://doi.org/10.1007/s11276-015-0947-7

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  • DOI: https://doi.org/10.1007/s11276-015-0947-7

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