Research On Green Link Weight Design For IP Network

With the rapid development of information and communications technology, the energy consumption of network increases dramatically, because the scale of network increasingly becomes larger and the number of devices in network also increases. However, the excess supply of resources and devices redundancy lead to high energy consumption and low efficiency in network. How to reduce energy consumption in network will be a focus of network design and research, which is called “green networking”. In recent years, due to its potential environmental and economic value, green networking has been widespread concerned.Energy-aware Routing is a research domain in green networking. According to the principle of resource integration, Energy-aware Routing move the whole traffic to a part of devices and links in network, in order to shut down the remaining unused links and devices and save energy for network. Its goal is to reduce energy consumption of network as much as possible while ensuring that the network is under the normal operation and can also provide a certain quality of service(QoS). Traffic integration can be achieved by link weight design or routing path design.In this work, we focus on how to save energy for IP network by designing link weight based on Energy-aware Routing.Firstly, we establish a green IP network model based on QoS which is designed to balance QoS and energy-saving. Its goal is to minimize the energy consumption of the link and network delay cost while ensuring QoS, such as bandwidth and network delay. Then we put forward two heuristic algorithms based on the model, which both aim at closing more links while guaranteeing a certain QoS. By designing link weight to integrate and redistribute traffic in network, they will work out green network topologies with less active links, which will consume less energy. The simulation confirmes that, although the two algorithms are different in ideas, they can achieve good results in energy saving.Secondly, we also establish a practical green IP network model based on linecard mode. The model pays attention to efficiency and practicability, and aims at minimizing the energy comsumption of links and linecards while ensuring bandwidth. Line-card, as the important part of the energy comsumption of the router, its on/off state can be fast changed and easily controlled. Therefore, it is more useful to study about line-card rather than node. Then we propose a heuristic algorithm that is designed to shut down more linecards which consume more energy rather than links. By link weight design, it will bring out a more practical and more energy-saving topology. This algorithm has good stability, good effect of energy-saving and a wide range of application, when compared to some other algorithms and models.Finally, we design a green IP network architecture and its deployment scheme, in which core network and access network are separated and green IP network solutions are flexibly used. Green IP network use energy-aware router which supports Multi-Topology Routing technologies to routing and control energy consumption of devices, and rely on green monitoring system to calculate green topology, make timely decisions and monitor green network operation, and achieve energy-saving based on the current protocols and technologies as far as possible.