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Providing adequate and reliable spectrum resources for unlicensed users in spectrum database-based cognitive radio networks is very challenging, mainly due to the dynamic resource availability induced by the licensed users' activities and radio environment. In this paper, we propose an adaptive spectrum access method based on spectrum database for cognitive radio (CR) networks. While making decision...
In this paper, we study the routing problem in multi-hop cognitive radio networks (CRNs). We observe that Primary Users (PUs) in CRNs exhibit unevenly geographic distribution due to their social behaviors. In the area with densely-distributed PUs, the low spectrum availability will severely decrease the Secondary Users (SUs) communication reliability. We are motivated to exploit Primary User (PU)...
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