A research by Ejder Baştuğ, Mérouane Debbah [pictured] Alcatel-Lucent and Mehdi Bennis, Centre for Wireless Communications, University of Oulu, Finland - considers "the problem of caching in next generation mobile cellular networks where small base stations (SBSs) are able to store their users' content and serve them accordingly.
The SBSs are stochastically distributed over the plane and serve their users either from the local cache or internet via limited backhaul, depending on the availability of requested content. We model and characterize the outage probability and average content delivery rate as a function of the signal-to-interference-ratio (SINR), base station intensity, target file bitrate, storage size and file popularity. Our results provide key insights into the problem of cache-enabled small cell networks".
[See the technology in action: "Saguna's Optimization and Monetization Technology to be Deployed in 2014" - here and "NSN Base Stations to Support ChinaCache CDN" - here]
Conclusion: " .. telecom operators can either deploy more base station or increase total storage size to guarantee a certain outage probability for QoE. For this deployment problem, an interesting future work would be investigating the trade-off between density of base stations and storage size"
See "Cache-enabled Small Cell Networks: Modeling and Tradeoffs" - here