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Full Text: NoSubject: search.filters.subject.Cognitive radio networks

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    A performance comparison of single-radio multichannel medium access control protocols
    (Institute of Electrical and Electronics Engineers Inc., 2020) Department of Electrical and Electronics Engineering; N/A; N/A; Ergen, Sinem Çöleri; Uçar, Seyhan; Kaytaz, Umuralp; Faculty Member; PhD Student; PhD Student; Department of Electrical and Electronics Engineering; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; 7211; N/A; N/A
    Single-radio multi-channel Medium Access Control (MAC) protocols aim to transmit in parallel on distinct channels while reducing the hardware cost. Although a variety of MAC protocols have been proposed in this context, no detailed classification and performance comparison is available. In this paper, we first classify previous efforts by their rendezvous characteristics as single- and multi-rendezvous protocols. Multirendezvous protocols have the capability of supporting simultaneous handshaking on different channels whereas with single-rendezvous protocols only asynchronous channel negotiations are allowed. Then, we further classify these protocols according to their spectrum decision mechanisms. We demonstrate the functionality of single- and multi-rendezvous protocols under different scenarios via extensive simulations. Our findings show that multi-rendezvous protocol performs better when the transmission range is low and less number of channels is available. Single-rendezvous protocols, on the other hand, are more suitable for networks with larger traffic loads due to their slot-based decision-making schemes.
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    An overview of security issues in cognitive radio ad hoc networks
    (IGI Global, 2023) Islam, Noman; Syed, Darakhshan; Zia, Muhammad Furqan;  ; Graduate School of Sciences and Engineering;  
    Cognitive radio ad hoc network (CRAHN) is an emerging discipline of network computing. It combines the advantages of cognitive radio networks and mobile ad hoc networks. This chapter starts with an overview of various research issues of CRAHN along with representative solutions for these research issues. Among the various research issues presented, security is discussed in detail due to its prime importance. A review of existing literature reveals that not much work on security has been reported for cognitive radio networks. Specifically, an overview of security issues in CRAHN, presented in this article, is a novel work of this kind. A major part of this article highlights the importance of security in CRAHN and presents an overview of major security issues and the solutions proposed to address these issues in CRAHN. © 2023, IGI Global. All rights reserved.