Document Type

Article

Publication Date

Summer 5-2010

Publication Source

IEEE International Conference on Communications (ICC)

DOI

http://dx.doi.org/10.1109/ICC.2010.5502698

Publisher

Institute of Electrical and Electronics Engineers

Place of Publication

United States

ISBN/ISSN

978-1-4244-6402-9

Peer Reviewed

yes

Abstract

In cognitive radio networks, dynamic spectrumaccess is achieved by allowing secondary users (SUs) to probethe spectrum and utilize available channels opportunistically.Spectrum probing mechanisms should be efficient and fast toavoid harmful interference with primary users (PUs). Periodicprobing has been commonly adopted as a default spectrumprobing mechanism. In this paper, we attempt to study differentspectrum probing mechanisms and evaluate a performance metriccalled the probing delay, i.e., how quickly a probing mechanismcan detect a channel change. We find that randomization in theprobing strategy does affect the probing delay. Specifically, in theindependent sensing scenario, periodic probing indeed achievesthe smallest probing delay. In the cooperative sensing scenario,however, randomization can drastically reduce the probing delay.

Keywords

dynamic spectrum access, cognitive radio

Disciplines

Digital Communications and Networking | Engineering | Systems and Communications

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Link to Original Published Item

http://dx.doi.org/10.1109/ICC.2010.5502698