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The authors analyze a novel architecture for caching popular video content to enable wireless device-to-device collaboration. They focus on the asymptotic scaling characteristics and show how they depends on video content popularity statistics. They identify a fundamental conflict between collaboration distance and interference and show how to optimize the transmission power to maximize frequency reuse. Their main result is a closed form expression of the optimal collaboration distance as a function of the model parameters. Under the common assumption of a Zipf distribution for content reuse, they show that if the Zipf exponent 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.
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