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We consider spectrum sharing in a cognitive radio network where a secondary user co-exists with an ARQ-based primary user. A spectrum sharing protocol is proposed where the secondary user switches between cooperation and access modes. In the cooperation mode, the secondary system serves as a relay to assist the primary transmission, and in return accumulates credits. The credits allow the secondary...
Dynamic spectrum-sharing protocols are gaining attention due to the need for improved spectrum utilization. We propose a spectrum-sharing protocol with two-way relaying systems, where two licensed primary users A and B communicate with each other with the assistance of an unlicensed secondary transceiver C, which acts as a relay. The secondary transceiver C gains spectrum sharing by using a decode-and-forward...
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