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In this paper, we investigate fundamental throughput and delay tradeoffs in cognitive radio networks (CRN) with a primary user (PU) and a cooperative secondary user (SU). Considering the user fairness, we propose a novel cooperation scheme, where the PU transmits packets with a probability of α instead of always occupying the spectrum, in exchange for the SU's cooperation. The unauthorized SU can...
Exploiting cognition to the cache-enabled device-to- device (D2D) communication underlaying the multi- channel cellular network is the main focus of this paper. D2D pairs perform direct communications via sensing the available cellular channels, bypassing the base station (BS). Dynamic service is considered and the network performance is evaluated with the stochastic geometry. Node locations are first...
In this paper, we propose a framework to analyze the performance of relay-assisted networks. Bursty service, instead of infinite information source, is considered and the arrival process of packets is modeled as a Poisson process. Automatic repeat request (ARQ) protocol is adopted to deal with the transmission errors. Markov chain model is first established based on the node states to investigate...
Caching popular multimedia content is a promising way to unleash the ultimate potential of wireless networks. In this paper, we propose and analyze cache-based content delivery in a three-tier heterogeneous network (HetNet), where base stations (BSs), relays, and device-to-device (D2D) pairs are included. We advocate proactively caching popular content in the relays and parts of the users with caching...
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