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dc.contributor.authorEmara, Mostafa
dc.contributor.authorElsawy, Hesham
dc.contributor.authorSorour, Sameh
dc.contributor.authorAl-Ghadhban, Samir
dc.contributor.authorAlouini, Mohamed-Slim
dc.contributor.authorAl-Naffouri, Tareq Y.
dc.date.accessioned2019-02-24T06:13:10Z
dc.date.available2019-02-24T06:13:10Z
dc.date.issued2018-04-17
dc.identifier.citationEmara M, Elsawy H, Sorour S, Al-Ghadhban S, Alouini M-S, et al. (2018) Optimal Caching in 5G Networks With Opportunistic Spectrum Access. IEEE Transactions on Wireless Communications 17: 4447–4461. Available: http://dx.doi.org/10.1109/TWC.2018.2825351.
dc.identifier.issn1536-1276
dc.identifier.issn1558-2248
dc.identifier.doi10.1109/TWC.2018.2825351
dc.identifier.urihttp://hdl.handle.net/10754/631123
dc.description.abstractCache-enabled small base station (SBS) densification is foreseen as a key component of 5G cellular networks. This architecture enables storing popular files at the network edge (i.e., SBS caches), which empowers local communication and alleviates traffic congestion at the core/backhaul network. This paper develops a mathematical framework, based on stochastic geometry, to characterize the hit probability in multi-channel cache-enabled 5G networks with both unicast/multicast capabilities and opportunistic spectrum access. To this end, we first derive the hit probability by characterizing the opportunistic spectrum access success probabilities, service distance distributions, and coverage probabilities. An optimization framework for file caching is then developed to maximize the hit probability. To this end, a simple concave approximation for the hit probability is proposed, which highly reduces the optimization complexity and leads to a closed-form solution. The sub-optimal solution is benchmarked against two widely employed caching distribution schemes, namely, uniform and Zipf caching, through numerical results and extensive simulations. It is shown that the caching strategy should be adapted to the network parameters and capabilities. For instance, diversifying file caching according to the Zipf distribution is better in multicast systems with large number of channels. However, when the number of channels is low and/or the network is restricted to unicast transmissions, it is better to confine caching to the most popular files only.
dc.description.sponsorshipThis work was supported in part by a Grant from the Office of Competitive Research Funding at the King Abdullah University of Science and Technology (KAUST) and in part by the Deanship of Scientific Research at King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia, under Project KAUST-002. This paper was presented in part at the IEEE Global Communications Conference, December 2017 [1]. The associate editor coordinating the review of this paper and approving it for publication was K. Choi.
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)
dc.relation.urlhttps://ieeexplore.ieee.org/document/8340240
dc.rightsArchived with thanks to IEEE Transactions on Wireless Communications
dc.subjectCaching system
dc.subjectcellular networks
dc.subjectopportunistic spectrum access
dc.subjectstochastic geometry
dc.titleOptimal Caching in 5G Networks With Opportunistic Spectrum Access
dc.typeArticle
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.identifier.journalIEEE Transactions on Wireless Communications
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Electrical Engineering, King Fahd University of Petroleum and Minerals, Dhahran, 31261, , Saudi Arabia
dc.contributor.institutionDepartment of Electrical and Computer Engineering, University of Idaho, Moscow, ID, 83844, , United States
kaust.personElsawy, Hesham
kaust.personAlouini, Mohamed-Slim
kaust.personAl-Naffouri, Tareq Y.
kaust.grant.numberKAUST-002
refterms.dateFOA2019-02-24T06:18:19Z
dc.date.published-online2018-04-17
dc.date.published-print2018-07


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