Institute of Electrical & Electronic Engineers
Green communications has received much attention recently. For cellular networks, the Base Stations (BSs) account for more than 50 percent of the energy consumption of the networks. Therefore, reducing the power consumption of BSs is crucial to achieve green cellular networks. In this paper, the authors optimize the energy utilization in cellular networks whose BSs are powered with both regular energy from the grid and the renewable energy. They minimize the on-grid energy consumption of BSs by adapting their cell sizes. The cell size optimization problem is NP-hard. They divide the problem into two sub-problems: the multi-stage energy allocation problem and energy consumption minimization problem.