Optimizing File Retrieval in Delay-Tolerant Content Distribution Community

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Executive Summary

In WiFi-based Content Distribution Community Infrastructure (CDCI), file servers are deployed in diverse locations around cities, caching popular files interesting to a community. They serve file download requests from mobile users in proximity via WiFi. In this paper, the authors study the optimal caching strategy for file servers in CDCI so that file retrieval probability within deadline is maximized, subject to storage constraint of each file server. The optimal caching strategy depends on many factors, such as users' mobility patterns, access point topology, file popularity, etc. They have formalized this content management problem as a mixed integer optimization problem.

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