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Cognitive Radio Networks (CRNs) provide a solution for the spectrum scarcity problem facing the wireless communications community. To be able to utilize CRNs in practical applications, a certain level of Quality-of-Service (QoS) should be guaranteed to the Secondary Users (SUs) in such networks. In this paper, the authors propose a packet scheduling scheme that orders the SUs' transmissions according to the packet dropping rates and the number of packets queued waiting for transmission. A Medium Access Control (MAC) protocol, based on the mentioned scheduling scheme, is proposed for a centralized CRN.
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