An energy-efficient hybrid structure with resource allocation in OFDMA networks

Energy consumption of information and communication industry has generated increasing concerns recently, aiming at reducing power consumption or increasing energy efficiency. This paper proposes an energy efficient hybrid structure which introduces micro sites into traditional OFDMA cellular systems with only central macro base stations (BSs). The deployment of small and low power BSs alongside the central macro BSs is capable of advancing radio coverage, enhancing system capacity, and simultaneously increasing energy efficiency. Upon the proposed structure, two efficient solutions respectively based on Lagrangian dual decomposition (LDD) and serial carrier and power allocation (SCPA), are proposed to optimize energy efficiency. Simulation results show that our proposed hybrid structure can dramatically increase the energy efficiency and the downlink system capacity in OFDMA cellular systems.