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We propose a new scheme for increasing the throughput of video files incellular communications systems. This scheme exploits (i) the redundancy ofuser requests as well as (ii) the considerable storage capacity of smartphonesand tablets. Users cache popular video files and - after receiving requestsfrom other users - serve these requests via device-to-device localizedtransmissions. The file placement is optimal when a central control knows apriori the locations of wireless devices when file requests occur. However,even a purely random caching scheme shows only a minor performance losscompared to such a genie-aided scheme. We then analyze the optimalcollaboration distance, trading off frequency reuse with the probability offinding a requested file within the collaboration distance. We show that animprovement of spectral efficiency of one to two orders of magnitude ispossible, even if there is not very high redundancy in video requests.

Base-Station Assisted Device-to-Device Communications for High-Throughput Wireless Video Networks