Wireless Device-to-Device Communications With Distributed Caching

Date Added: May 2012
Format: PDF

The authors introduce a novel wireless Device-To-Device (D2D) collaboration architecture that exploits distributed storage of popular content to enable frequency reuse. They identify a fundamental conflict between collaboration distance and interference and show how to optimize the transmission power to maximize frequency reuse. Their analysis depends on the user content request statistics which are modeled by a Zipf distribution. Their main result is a closed form expression of the optimal collaboration distance as a function of the content reuse distribution parameters. They show that if the Zipf exponent of the content reuse distribution is greater than 1, it is possible to have a number of D2D interference-free collaboration pairs that scales linearly in the number of nodes.