Suboptimal Online Resource Allocation in Hybrid Energy Supplied OFDMA Cellular Networks

In this letter, by jointly considering the harvested energy control, power allocation, and sub-carrier assignment, we address the grid energy conservation problem in QoS guaranteed orthogonal frequency division multiple Access (OFDMA) cellular networks, in which the base station is supplied by both grid and renewable energy. By using the stochastic optimization theory and the Lagrange dual method, we propose a suboptimal online resource allocation (SORA) algorithm, which is of low computational complexity. In particular, the SORA algorithm is asymptotically optimal as the battery capacity is to be infinite. Simulation results demonstrate the advantages of the SORA algorithm.