Cognitive Radio Networks

Although the proliferation of wireless applications operating in unlicensed spectrum bands has resulted in the overcrowding, recent analysis has shown that license bands are still underutilized. Cognitive Radio (CR) is seen as the key enabling technology to address the spectrum shortage problem, opportunistically using the spectrum allocated for TV bands. The IEEE 802.22 Standard, based on CR, has been proposed for Wireless Regional Area Networks (WRAN). One of the major challenges in the newly proposed standard is the self-coexistence which is the ability to ensuring the Quality of Service among WRANs. We regard the self-coexistence problem as a distributed channel assignment problem, where each IEEE 802.22 cell acquires, in a dynamic and distributed way, a clear spectrum chunk free of interference.

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• Vanessa Gardellin