Energy-efficient cooperative coded caching for heterogeneous small cell networks

Abstract

Coded caching and cooperative caching have been considered as two promising technologies in heterogeneous small cell networks. Although some works have been done for coded caching and cooperative caching in heterogeneous small cell networks, to the best of our knowledge, these two important issues have traditionally been addressed separately. However, it is necessary to jointly consider these two significant issues to reduce the backhaul rate and improve content delivery as well as the Quality of Experience (QoE) of end-users. Moreover, the energy efficiency issue for content caching and content delivery is also extremely significant but excessively negligent. In this paper, we jointly consider the coded caching and cooperative caching issues, and propose a cooperative coded caching scheme to improve the content delivery efficiency and enhance the QoE for end-users. And then, based on the proposed scheme, we establish an energy consumption model from the perspective of content caching and content delivery to optimize the energy efficiency. In addition, we propose a greedy-based algorithm to solve this energy efficiency issue by optimizing the caching placement. Finally, simulation results show the performance of the proposed scheme.