Dynamic resource allocation for energy-efficiency maximization in heterogeneous wireless networks

In this paper, by jointly considering power allocation and network selection, we maximize the energy efficiency in heterogeneous wireless networks (HetNets), where user equipments are typically multi-homed. In order to effectively deal with the dynamics of HetNets, a stochastic optimization problem is formulated, which optimizes the long-term energy efficiency under the constraints of system stability, peak power consumption and average transmission rate. By adopting parametric approach and Lyapunov optimization, we derive an equivalent problem out of the original problem and further investigate its optimal resource allocation. Then, to reduce the complexity, a suboptimal allocation algorithm is proposed based on relaxed optimization. The simulation results demonstrate the theoretical analysis.