| 摘要 |
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 betwe en 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, eac h 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 to ne and its associated polling tone. An abstract wireless link could be established by t he wireless module transmitting the polling tone associated with the vacant transmission channel and detecting from second other wireless modules the sensing tone associated wit h the vacant transmission channel. |
