Joint Caching and User Association for Energy Harvesting Aided Internet of Things with Full-Duplex Backhauls

Due to its wide coverage, stable link, and low latency, cellular network has become one of the main access networks for Internet of things (IoT). However, the expenses of backhauls and node charging grow fast with the number of nodes. Towards this issue, this paper addresses the joint caching and user association for energy harvesting aided IoT with full-duplex backhauls. We formulate the node charging, full-duplex base station association, and cache allocation by using Stackelberg game. Then the structural characteristics are utilized to decompose the model into a two-layer knapsack problem. On the basis of that, an alternative direction iteration is proposed, which firstly compresses the solution space by the constraints, and then obtains the optimization results by alternative iterations. Simulation results verify the effectiveness of the proposed algorithm in utility improvement and cost reduction.