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Delay-Constrained Caching in Cognitive Radio Networks

Delay-Constrained Caching in Cognitive Radio Networks

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 Delay-Constrained Caching in Cognitive Radio Networ ks

In cognitive radio networks, unlicensed users can use under-utilized licensed spectr um to achieve substantial performance improvement. To avoid interference with licensed users, unlicensed users must vacate the spectr um when it is accessed by licensed (primary) users. Since it takes some time for unlicensed users to switch to other available channels, the ongoing da ta transmissions may have to be inter r upted and the transmission delay can be significantly increased. This makes it hard for cognitive radio networks to meet the delay constraints of many applications. In this paper, we develop caching techniques to address this problem. We for mulate the cache placement problem in cognitive radio networ ks as an optimization problem, where the goal is to minimize the total cost, subject to some delay constraint, i.e., the da ta access delay can be sta tistically bounded. To solve this problem, we propose a cost-based approach to minimize the caching cost, and design a delay-based approach to sa tisfy the delay constraint. Then, we combine them and propose a distributed hybrid approach to minimize the caching cost subject to the delay constraint. Simulation results showtha t our approaches outperfor m existing caching solutions in ter ms of total cost and delay constraint, and the hybrid approach performs the best among the approaches satisfying the delay constraint.


 


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  • Model: PROJ7692
  • 999 Units in Stock
  • Manufactured by: ClickMyProjects

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This product was added to our catalog on Wednesday 09 August, 2017.

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