Demo: CogMAC+ - a decentralized multichannel MAC protocol for cognitive wireless networks

Cognitive MAC schemes are emerging as a prospective solution to efficiently utilize the wireless medium. In order to enable opportunistic access to unused licensed band, a node has to monitor the frequency spectrum and carry out its transmission without causing harmful interference to the primary user. In this work, we demonstrate a decentralized multichannel MAC protocol CogMAC+ which uses a multichannel preamble reservation scheme to achieve parallel transmissions for multiple secondary users. Moreover, CogMAC+ uses an adaptive energy detection scheme to dynamically set the frame detection threshold based on the false positive detection ratio. Our table-top demonstration shows that CogMAC+ enables spectral coexistence and allows nodes to utilize spectrum opportunities efficiently in a dynamic fashion.

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