MAPCaching: A novel mobility aware proactive caching over C-RAN

Caching at the wireless edge is a promising way to alleviate the heavy burden of the backhaul links and reduce the latency of transmission and handover. Although some effective caching schemes have been introduced to Cloud based Radio Access Network (C-RAN), most of them were designed without consideration of users' mobility. In this paper, we investigate the mobility property in cache-enabled C-RAN, and propose a mobility aware proactive caching strategy. We aim to design a novel controller, which is able to utilize the computation and storage resources in C-RAN, and responsible for making cache decision for both the baseband unit (BBU) pool and Remote Radio Head (RRH). A transmission delay model is introduced to formulate the cache placement optimization problem. To solve the problem, we propose an algorithm named MAPCaching. Numerical simulation results show that MAPCaching significantly outperforms the Greedy and EPC caching strategies in terms of average content access delay and cache hit rate by 30% and 20%, respectively.