4,048 research outputs found
Hypergraph-Based Analysis of Clustered Cooperative Beamforming with Application to Edge Caching
The evaluation of the performance of clustered cooperative beamforming in
cellular networks generally requires the solution of complex non-convex
optimization problems. In this letter, a framework based on a hypergraph
formalism is proposed that enables the derivation of a performance
characterization of clustered cooperative beamforming in terms of per-user
degrees of freedom (DoF) via the efficient solution of a coloring problem. An
emerging scenario in which clusters of cooperative base stations (BSs) arise is
given by cellular networks with edge caching. In fact, clusters of BSs that
share the same requested files can jointly beamform the corresponding encoded
signals. Based on this observation, the proposed framework is applied to obtain
quantitative insights into the optimal use of cache and backhaul resources in
cellular systems with edge caching. Numerical examples are provided to
illustrate the merits of the proposed framework.Comment: 10 pages, 5 figures, Submitte
A Literature Survey of Cooperative Caching in Content Distribution Networks
Content distribution networks (CDNs) which serve to deliver web objects
(e.g., documents, applications, music and video, etc.) have seen tremendous
growth since its emergence. To minimize the retrieving delay experienced by a
user with a request for a web object, caching strategies are often applied -
contents are replicated at edges of the network which is closer to the user
such that the network distance between the user and the object is reduced. In
this literature survey, evolution of caching is studied. A recent research
paper [15] in the field of large-scale caching for CDN was chosen to be the
anchor paper which serves as a guide to the topic. Research studies after and
relevant to the anchor paper are also analyzed to better evaluate the
statements and results of the anchor paper and more importantly, to obtain an
unbiased view of the large scale collaborate caching systems as a whole.Comment: 5 pages, 5 figure
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