Improving energy-efficiency of HFC networks with a master-slave linecard configuration

Abstract

We develop a novel traffic scheduling algorithm based on a master-slave linecard (LC) configuration to improve the energy-efficiency of hybrid fiber-coaxial (HFC) networks. The algorithm forwards packets to the master or slave LC adaptively according to the traffic load, and toggles the LCs between working and sleeping modes for energy-saving. To optimize the algorithm's key parameters, we model the system using a twodimensional Markov process and derive the analytical expressions of several performance metrics, including average packet delay, LC switching frequency, and energy efficiency improvement. We then verify the theoretical analysis with numerical simulations using the Monte Carlo method. Both the theoretical and simulation results indicate that the proposed algorithm can achieve significant energy efficiency improvement, while keeping the average packet delay and LC switching frequency low.

Adaptive bandwidth mechanism using dual rate OLT for energy efficient WDM–TDM passive optical network

“…Master-slave line card (LC) based traffic scheduling algorithm has been proposed to provide the energy efficiency in the HFC networks. Based on traffic load, reported algorithm dynamically transfers packets to either master or slave LC and idle LC is toggled to sleeping mode to save energy [22]. To support DOCSIS (Data Over Cable Service Interface Specification) 3.0 standard in HFC network, traffic aware algorithms have been reported [23] that change the operation status of two primary network elements cable modem (CM) and cable modem termination system (CMTS) dynamically.…”

“…Dual rate mechanism have been utilized for saving energy in other type of access networks such as hybrid fiber-coaxial (HFC) access networks [22][23][24][25]. Master-slave line card (LC) based traffic scheduling algorithm has been proposed to provide the energy efficiency in the HFC networks.…”