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Cognitive Radio has been one of the key research topics in the wireless community for about 10 years. The digital switch-over in the TV bands provides opportunities for Cognitive Radio Systems (CRS) to operate in the UHF spectrum under incumbent protection restrictions. Regulation bodies, in particular the FCC and OFCOM in the UK, have specified parameters under which CRS shall operate. In this paper, the authors analyze key scenarios for CRS stemming from the QoSMOS project. Then, they analyze how these scenarios can be mapped into the TVWS context by considering link budget computation based on FCC and OFCOM transmit power recommendations as well as statistical propagation models for the UHF band.
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