Qos-Constrained Transmission Policy in Hybrid Energy Supply Wireless Communication System

Aiming at improving the energy efficiency of the primary battery in hybrid energy supply wireless communication system, this paper proposes an enhanced date transmission control strategy with the save-then-transmit protocol, where the energy supply of the transmitter comes from both the primary battery and the energy harvester. We formulate the problem of data management as a probabilistic constrained optimization problem, i.e., minimizing the energy delivered from the primary battery while keeping the overflow probability of the data buffer below a desired threshold which can be defined as Quality of Service(QoS) constraint. We use the historical burst packet arrival of data and data buffer limit to estimate the overflow probability by large deviation principle, and an online control strategy is derived. The major contribution of this paper is that the proposed strategy guarantees a stable and high quality of energy supply in energy harvesting (EH) wireless communication system. Numerical results are presented to validate the effectiveness of the proposed control strategy.