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arXiv · 1702.02179

Opportunistic Content Delivery in Fading Broadcast Channels

Asma Ghorbel·Khac-Hoang Ngo·Richard Combes·Mari Kobayashi·Sheng Yang
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Abstract

We consider content delivery over fading broadcast channels. A server wants to transmit K files to K users, each equipped with a cache of finite size. Using the coded caching scheme of Maddah-Ali and Niesen, we design an opportunistic delivery scheme where the long-term sum content delivery rate scales with K the number of users in the system. The proposed delivery scheme combines superposition coding together with appropriate power allocation across sub-files intended to different subsets of users. We analyze the long-term average sum content delivery rate achieved by two special cases of our scheme: a) a selection scheme that chooses the subset of users with the largest weighted rate, and b) a baseline scheme that transmits to K users using the scheme of Maddah-Ali and Niesen. We prove that coded caching with appropriate user selection is scalable since it yields a linear increase of the average sum content delivery rate.

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Asma Ghorbel, Khac-Hoang Ngo, Richard Combes, Mari Kobayashi, Sheng Yang. 2017-02-07. Opportunistic Content Delivery in Fading Broadcast Channels. https://arxiv.org/abs/1702.02179

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