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In Opportunistic Spectrum Access (OSA) networks, Secondary unlicensed Users (SUs) need a common Control Channel (CC) to identify the spectrum opportunities, i.e., common spectrum holes unused by licensed Primary Users (PUs). Typically, an interference-free CC is unrealistically assumed in the paper. In this paper, the authors evaluate the impact of the availability and the characteristics of the CC on the performance of cooperative spectrum sensing. They deal with the dimensioning of an underlay Ultra-WideBand (UWB) signalling network for the exchange of sensing data among secondary Cognitive Radio (CR) nodes avoiding harmful interference to PUs.
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