Proactive Caching in Mobile Networks with Delay Guarantees

The explosive growth of mobile data traffic and the envisioned delay sensitive applications in 5G networks ranging from high definition video streaming with strict playout deadlines to multi modal tactile/haptic with kinaesthetic feedback that require some form of edge cloud cache support makes mobility a challenge. In this paper, we propose a Proactive Caching with Delay Guarantees (PCDG) approach to enhance the supporting of seamless mobility within 5G networks that are Information-Centric Networking (ICN)-aware. The proposed scheme is designed to cache contents into a set of potential edge clouds with delay guarantees and to achieve a trade-off among caching, redirection and missing cost. In particular, this approach consider the delay constraints in mobile network, especially the queuing delay in network links and edge clouds, which are modeled as M/M/1 and M/M/c queuing systems respectively. We formulate and linearize this problem as a Mixed Integer Linear Programming (MILP) model and compare the performance with other techniques. The result obtained from simulation reveal that the proposed PCDG scheme lead to a significantly lower total cost and higher satisfied probability albeit higher computational/complexity cost.