2014/09/26 by Bartłomiej Błaszczyszyn, Bartlomiej Blaszczyszyn, Anastasios Giovanidis · 466 citations
Computer Science · #Caching and Content Delivery #Cellular network #Computer network #Computer science #Cooperative Communication and Network Coding #Opportunistic and Delay-Tolerant Networks #cs.NI
paper · pdf · doi:10.1109/icc.2015.7248843
published as 2015 IEEE International Conference on Communications (ICC) · 6 pages, 6 figures, conference
arxiv created 2014/09/26 · openalex publication_date 2015/06/01 · arxiv updated 2016/01/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In this work we consider the problem of an optimal geographic placement of content in wireless cellular networks modelled by Poisson point processes. Specifically, for the typical user requesting some particular content and whose popularity follows a given law (e.g. Zipf), we calculate the probability of finding the content cached in one of the base stations. Wireless coverage follows the usual signal-to-interference-and noise ratio (SINR) model, or some variants of it. We formulate and solve the problem of an optimal randomized content placement policy, to maximize the user's hit probability. The result dictates that it is not always optimal to follow the standard policy “cache the most popular content, everywhere”. In fact, our numerical results regarding three different coverage scenarios, show that the optimal policy significantly increases the chances of hit under high-coverage regime, i.e., when the probabilities of coverage by more than just one station are high enough.