Distributed cache for efficient content sharing in heterogeneous networks

Distributed cache at mobile user devices and small base stations (SBSs) can improve the efficiency and reduce the delay for content dissemination in heterogeneous cellular networks (HetNets). One major challenge lies in the limited storage capacity of the participating mobile devices and SBSs. This paper investigates the design of an effective distributed content cache policy with heterogeneity (DCP-H) based on erasure code in terms of SBSs and mobile devices by considering sociality characteristics and physical communication conditions. The key feature of our proposed scheme lies in the PageRank algorithm based design, in which the transmit power and delivery delay is optimized through optimizing the cache states of content items to maximize cache hit ratio. Numerical results demonstrate the performance and advantage of our proposed scheme.