Imperial College London
Optimal cache content placement in a wireless small cell Base Station (sBS) with limited backhaul capacity is studied. The sBS has a large cache memory and provides content-level selective offloading by delivering high data rate contents to users in its coverage area. The goal of the sBS Content Controller (CC) is to store the most popular contents in the sBS cache memory such that the maximum amount of data can be fetched directly from the sBS, not relying on the limited backhaul resources during peak traffic periods. If the popularity profile is known in advance, the problem reduces to a knapsack problem.