Multi-transmitter coded caching networks with transmitter-side knowledge of file popularityMulti-transmitter coded caching networks with transmitter-side knowledge of file popularity Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2023-12-012022enThis work was supported in part by the ERC Project DUALITY under Grant 725929, and in part by the European Research Council (ERC) Project CARENET under Grant 789190. Parts of this work have been published in the 18th International Symposium on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks (WiOpt 2020)This work presents a new way of exploiting non-uniform file popularity in coded caching networks. Focusing on a fully-connected fully-interfering wireless setting with multiple cache-enabled transmitters and receivers, we show how non-uniform file popularity can be used very efficiently to accelerate the impact of transmitter-side data redundancy on receiver-side coded caching. This approach is motivated by the recent discovery that, under any realistic file-size constraint, having content appear in multiple transmitters can in fact dramatically boost the speed-up factor attributed to coded caching. We formulate an optimization problem that exploits file popularity to optimize the placement of files at the transmitters. Consequently, we propose a search algorithm that solves the problem at hand while reducing the variable search space significantly. We also prove an analytical performance upper bound, which is in fact met by our algorithm in the regime of many receivers. Our work reflects the benefits of allocating higher cache redundancy to more popular files, but also reflects a law of diminishing returns where for example very popular files may in fact benefit from minimum redundancy. In the end, this work reveals that in the context of coded caching, employing multiple transmitters can be a catalyst in fully exploiting file popularity, as it avoids various asymmetry complications that appear when file popularity is used to alter the receiver-side cache placement.http://creativecommons.org/licenses/by/4.0/IEEE/ACM Transactions on Networking3131277-1292 Serbetci Berksan Lampiris, Eleftherios, 1987- Spyropoulos Thrasyvoulos Σπυροπουλος Θρασυβουλος Caire, Giuseppe, 1965- Elia Petros Institute of Electrical and Electronics Engineers Coded caching Optimization Femtocaching