부산대학교 도서관

Content caching (CC) plays a crucial role in improving quality of service (QoS) and mitigating the congestion of backhaul links for the Heterogenous Networks (HetNets). The accessibility of users to the base stations (BSs) seriously depends on the wireless channel capacities which can be improved by designing an efficient content delivery (CD) policy. Thereupon, a nature idea is to jointly design the CC and CD strategy to effectively utilize the limited radio resource and cache capacity of BSs. In this paper, we focus on the joint coded caching, user association (UA) and bandwidth allocation (BA) optimization problem, aiming at minimizing the overall power consumption. Particularly, we analyze energy consumption in both backhaul and access links under coded caching strategy. Then we utilize an alternative optimization algorithm to decompose the original problem into the CC and CD problems, which are solved via convex optimization, matching and bisection algorithm. Numerical results show that the proposed scheme significantly reduces power consumption compared to the benchmarks.