Energy efficient power allocation scheme for multi-cell with hybrid energy sources

The renewable energy is expected as one of the promising option to reduce the CO2 emissions for the future wireless communication. This paper considers the power allocation of a multi-cell network where the base station powered by hybrid energy source, i.e., the energy is supplied by a constant energy source and an energy harvester. Due to the features of the renewable energy and multi-cell network, we need to develop an efficient power allocation scheme to utilize the renewable and constant energy efficiently. In order to make full use of hybrid energy, we formulate the power allocation to minimize the energy drawn from the constant source and to maximize the amount of transmitted data per energy consumption, which is shown to be a non-convex optimization problem. It is transformed into an equivalent convex optimization problem by exploiting the properties of fractional programming. Finally an optimal offline iterative algorithm is proposed to solve this problem. Simulation results show that the proposed algorithm can make full use of the harvested renewable energy and all the energy can be utilized in a more efficient mode, which can help to provide some valuable insights for more practical efficient online schemes.