Dynamic energy-saving algorithm in green hybrid wireless-optical broadband access network

Since the access network plays the dominant role of energy consumption in the whole network, it is necessary to study the energy-efficient design on the access technique. This paper aims to develop the green Hybrid Wireless-Optical Broadband Access Network (HWOBAN) by sleeping low-loaded Optical Network Units (ONUS) as much as possible to save the energy. Correspondingly, a heuristic approach, Energy-saving Algorithm based on Sleeping Low-loaded OUNs (EASLO), is proposed in this paper. In EASLO, most of traffic has higher probability to be carried by the currently active ONUs through dynamic energy-awareness mechanism, so that the higher resource utilization of ONUs can be achieved. Meanwhile, in order to improve the energy efficiency, we can sleep low-loaded ONUs, each of which can satisfy the conditions of traffic rerouting, and then transfer the residual traffic on these sleeping ONUs to the other active ones. The simulation results show that, our proposed EASLO method has better performance of energy savings than traditional method. (C) 2012 Elsevier GmbH. All rights reserved.