Tone based cognitive radio for opportunistic communications

H - Electricity – 04 – W

Patent

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Details

H04W 74/08 (2009.01) H04W 88/06 (2009.01)

Patent

CA 2633152

Within both the licensed and unlicensed wireless spectrum, benefits are obtained in allowing devices to form and communicate based upon opportunistic spectrum availability. At present such ad-hoc networks are established using either directly existing Media Access Control protocols or proposing modifications to them. According to the invention, there is provided a method for allowing abstract wireless links, i.e., arbitrary cooperation among a set of proximite wireless nodes, to be established between devices in a fast and efficient manner. Beneficially the approach allows multi- standard cognitive radios to operate in ad-hoc environments and non-ad-hoc environments. Accordingly a wireless module monitors a plurality of sensing tones and polling tones, each pair of sensing and polling tones associated with a transmission channel. A wireless module determines a vacant transmission channel by the absence of both a sensing tone and its associated polling tone. An abstract wireless link could be established by the wireless module transmitting the polling tone associated with the vacant transmission channel and detecting from second other wireless modules the sensing tone associated with the vacant transmission channel.

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