QoS aware dynamic power scaling algorithms for deploying energy efficient routers

Energy efficient routers (EERs) are promising devices to achieve green communications for ISP to save energy and cost. However, deploying this kind of routers may introduce severe accumulated packet delay, especially for high-end optical routers. In this paper, we present three contributions to solve the above issue with dynamically balancing QoS and the energy consumption, while preserve the real deployment simple and flexible. First, we propose a QoS aware power scaling algorithm for single self-motivated EER. Second, we present a QoS aware open-loop deployment method by using a short-term traffic forecast model. This model can assist EERs to adapt their capacities with the information of the incoming network traffic along the traffic path. Third, we propose a QoS aware feedback deployment method for better energy efficiency by building local control systems between two adjacent EER pairs. We evaluate the above algorithms by performing simulations. The results show that our methods are energy efficieny while controlling the packet delay.