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Spectrum scarcity is becoming a serious issue due to the rapid development of wireless communication technology. Dynamic spectrum sharing can effectively improve the spectrum usage by allowing Secondary unlicensed Users (SUs) to dynamically and opportunistically share the spectrum with Primary licensed Users (PUs). In this paper, the authors investigate a spectrum negotiation mechanism under incomplete information in a dynamic environment, where both the PU and the SU can obtain rate increases through cooperative communications. Specifically, an SU relays traffics for a PU in exchange for dedicated transmission time for the SU's own communication needs.
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