Latency Analysis of Cooperative Caching with Multicast for 5G Wireless Networks

The explosion of mobile data traffic has an adverse effect on communication delay and system performance in 5G wireless network. Deploying a number of caches on the base stations(BSs) to cache content has became an essential solution. In this paper, we present a caching structure and propose a CMAC(Cooperative Multicast-Aware Caching) strategy to reduce the average latency of delivering content. The strategy is based on the characteristics of multicast and cooperation among BSs. In this strategy, we pay more attention to the users' QoE and the content-access latency. The cooperative caching scheme for multicast is more important in improving the cache hit ratio and efficiency of content delivery. We also formulate the optimization problem in using CMAC strategy and introduce an algorithm with performance guarantees. The relevant trace-driven simulations reveal that CMAC yields up to 13% decrease in the average content-access latency compared to MAC(Multicast-Aware Caching) scheme with the same total cache capacity.