Skip to main content

Cache-Aided Coded Multicast for Correlated Sources

20 October 2016

New Image

The combination of edge caching and coded multicasting is a promising approach to improve the efficiency of content delivery over cache-aided networks. However, the global caching gain obtained by existing solutions is limited due to the increasingly personalized nature of the content that users consume. In this paper, the cache-aided coded multicast problem is generalized to account for the correlation among the network content by formulating a source compression problem with distributed side information. A correlation-aware achievable scheme is proposed and an upper bound on its performance is derived. It is shown that considerable load reductions can be achieved, compared to state of the art correlation-unaware schemes, when caching and delivery phases specifically account for the correlation among the content files.