title: Cache-enabled small cell networks: modeling and tradeoffs.
abstract: We consider a network model where small base stations (SBSs) have caching capabilities as a means to alleviate the backhaul load and satisfy users' demand. The SBSs are stochastically distributed over the plane according to a Poisson point process (PPP) and serve their users either (i) by bringing the content from the Internet through a finite rate backhaul or (ii) by serving them from the local caches. We derive closed-form expressions for the outage probability and the average delivery rate as a function of the signal-to-interference-plus-noise ratio (SINR), SBS density, target file bitrate, storage size, file length, and file popularity. We then analyze the impact of key operating parameters on the system performance. It is shown that a certain outage probability can be achieved either by increasing the number of base stations or the total storage size. Our results and analysis provide key insights into the deployment of cache-enabled small cell networks (SCNs), which are seen as a promising solution for future heterogeneous cellular networks.
authors.affiliation: Large Networks and Systems Group (LANEAS), CentraleSupélec, Gif-sur-Yvette, 91192 France.
authors.forename: Ejder
authors.initials: E
authors.lastname: Baştuǧ
authors.affiliation: Centre for Wireless Communications, University of Oulu, 90014Oulu, Finland.
authors.forename: Mehdi
authors.initials: M
authors.lastname: Bennis
authors.affiliation: Large Networks and Systems Group (LANEAS), CentraleSupélec, Gif-sur-Yvette, 91192 France ; Telecommunication Department, CentraleSupélec, Gif-sur-Yvette, 91192 France.
authors.forename: Marios
authors.initials: M
authors.lastname: Kountouris
authors.affiliation: Large Networks and Systems Group (LANEAS), CentraleSupélec, Gif-sur-Yvette, 91192 France ; Mathematical and Algorithmic Sciences Lab, Huawei France R&D, Boulogne-Billancourt, 92100 France.
authors.forename: Mérouane
authors.initials: M
authors.lastname: Debbah
keywords: Caching; Mobile cellular networks; Poisson point process; Small cell networks; Stochastic geometry