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We consider a cognitive radio system that consists of primary user, secondary user, and their destinations. The secondary user has a relaying capability, i.e., it transmits the relayed packets from the primary user. Unlike most of the previous works that restrict the secondary user to transmit only in the idle time slots, we assume that the secondary user interferes on the primary user with certain...
In this paper, we characterize the average end-to-end delay in an opportunistic multihop secondary cognitive radio network overlaid with a primary multihop network. The nodes in both networks use a random medium access control scheme with exponentially distributed backoff. We first model the network as a two-class priority queuing network and use queuing theoretic approximation techniques to obtain...
We consider a cognitive setting in which a secondary user tries to opportunistically access a primary channel. Due to the large distance between the secondary source and its destination, the cognitive link involves a relay to forward the secondary data packets to the destination. Since the secondary relay is assumed to be half-duplex, the source and relay operate at exclusive time slots. We obtain...
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