A Study of Optimized Caching and User Mobility in Wireless Cache-enabled Networks

Abstract

With increasing data rate demand, caching popular multimedia content at base stations or routers is emerging as a promising technology for 5G. The primary benefits of wireless caching in cellular networks are traffic offload from macro base stations and decreased delays at the user equipment. However, there are few points of concern that have yet to be addressed, such as optimal caching strategy, impacts of mobility and interference characterization. We address these concerns with three contributions. Firstly, we propose a caching strategy to enhance delay performance by utilizing the core routers. Secondly, we develop a mobility analysis for a small-cell network with caching abilities at small-cell base stations. Finally, the interference characterization of a cache network deviates from a traditional cellular network due to the opportunistic nature of association, and therefore, we develop an asymptotic analysis for the generalized fading channel that can be used for considered networks. Our analysis leads to following conclusions: firstly, static caching or simple content placement strategy can outperform state-of-the-art dynamic caching strategies; secondly, association with a cache source is ineffective for high velocity users; and finally, our developed asymptotic approximation for a Generalized-Gamma fading model provides better performance measurements over existing methods.