University of Calgary
Recent work has demonstrated that for content caching, joint design of storage and delivery can yield significant benefits over conventional caching approaches. This is based on storing content in the caches, so as to create coded-multicast opportunities even amongst users with different demands. Such a coded-caching scheme has been shown to be order-optimal for a caching system with single-level content, i.e., all content is uniformly popular. In this paper, the authors consider a system with content divided into multiple levels, based on varying degrees of popularity.