A Cooperation-Based Caching Scheme for Heterogeneous Networks

Caching is a promising technology to alleviate the transmission pressure of the 5G heterogeneous networks. To overcome the drawbacks of the existing caching schemes that ignore the heterogeneity or the cooperation characteristics of the heterogeneous networks, this paper proposes a cooperation-based caching scheme (CBCS). Based on the scheme, the average energy consumption incurred by a user equipment (UE) to obtain its desired content is formulated as an NP-hard optimization problem, and two greedy heuristic algorithms are developed to solve the problem. In addition, our simulation results show the gains of the proposed CBCS over the existing caching schemes with some parameters changing.