Random Access Protocols for Collaborative Spectrum Sensing in Multi-Band Cognitive Radio Networks

In this paper, collaborative sensing and distributed detection are addressed in the context of multi-band cognitive radios. In a cognitive radio network, all the nodes may sense the spectrum simultaneously. They should then exchange their sensing results in order to improve the reliability of the de...

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Bibliographic Details
Published in:IEEE journal of selected topics in signal processing 2011-02, Vol.5 (1), p.124-136
Main Authors: Chen, Rong-Rong, Teo, Koon Hoo, Farhang-Boroujeny, Behrouz
Format: Article
Language:English
Subjects:
Access control
Access protocols
Bandwidth
Cognitive radio
Cognitive radio (CR) networks
Collaboration
collaborative spectrum sensing
Detection
Interference
Mathematical models
Media Access Protocol
medium access control (MAC)
multi-band
Networks
Performance analysis
Protocol (computers)
Radio
Random access
Spectra
Spectral bands
Studies
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Summary:In this paper, collaborative sensing and distributed detection are addressed in the context of multi-band cognitive radios. In a cognitive radio network, all the nodes may sense the spectrum simultaneously. They should then exchange their sensing results in order to improve the reliability of the detection. This exchange of information has to be done effectively to improve the bandwidth efficiency of the network. We propose a generalized medium access control (MAC) signaling protocol based on random access and study its performance through a thorough theoretical analysis. We begin with a nonadaptive protocol with fixed parameters. The numerical results obtained from analysis reveals that the fixed parameter protocol is not robust to the variation of the network conditions which, in general, are unknown a priori. We thus extend the proposed protocol to an adaptive one. Analysis of this adaptive protocol reveals its much superior performance. Our analysis covers a wide range of network conditions, including the case where some spectral activities may be hidden from a few of cognitive nodes and the case when a cognitive node senses only a subset of spectral bands. All theoretical results are corroborated through computer simulations.
ISSN:1932-4553
1941-0484
DOI:10.1109/JSTSP.2010.2053017