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A Mobility-Aware Caching Scheme in Heterogeneous Cellular Networks

User mobility is a challenging problem in heterogeneous cellular networks. In this paper, we try to turn the mobility challenge into an opportunity to reduce latency. We first define a model of an urban cellular network in which mobile users can move between different small cells. Then, by introducing a scheme called Cooperative LRU, we use user mobility to reduce the file download delays. In this method, the requested file which is cached in the current user’s cell is also cached in two adjacent cells. This means that the caching scheme in the current cell is reactive and in two other adjacent cells is proactive. Finally, we have a comparison between traditional methods and the introduced method and we examine the effect of different network and kinetic parameters on reducing latency.