Performance Gain on cache enabled coordinated transmission policy in Small Cell Networks

Network densification can meet the high traffic demands in future cellular networks, whose throughput is limited by the inter-cell interference (ICI) especially when traffic load is high. Caching popular contents at the base station (BS) can reduce backhaul cost and file download time, which can also enable BS cooperation without high capacity backhaul. In this paper, we investigate the throughput gain introduced by local caching at the BSs. We derive the average throughput for the cache-enabled BS cooperation policy, and compare with a baseline network without interference coordination. Analytical and simulation results show that the caching gain is high when the traffic load is high and the popularity distribution is far from uniform.