绿色IP over WDM网络研究进展

近年来光网络朝着高速率、大带宽的方向迅猛发展,设备数目快速增加导致网络能耗急剧增长。为了降低网络能耗,提高能量利用率,绿色IP over WDM网络的概念被提出,并成为光网络领域的最新研究热点之一。对现有光网络节能方法的研究状况进行综述,从网络设备入手,讨论业务负载和设备能耗的关系,建立了两种能耗模型。基于IP over WDM网络结构,利用数学表达式描述了网络能耗最小化问题。对当前网络级的节能方法进行分类,分析了其基本原理和节能效果,并选取代表性的节能方法进行比较,得出了现有方法存在的局限性和不足,对进一步的研究方向提出了建议。

Recent Research Progress in Green IP over WDM Network

In recent years,optical network is developing towards high rate and wide bandwidth.As the number of network equipments in optical network increases,the network power consumption has a sharp rising.In order to decrease the energy consumption and improve the energy efficiency,the concept of green IP over WDM network has been proposed and it has become a hotspot for research in the area of optical network.The existing research status for energy-saving approaches in optical network is reviewed.Specifically,starting with network equipment,the relationship between traffic load and energy consumption of network equipments is discussed and two power consumption models are established.Then a mathematical expression of minimized energy consumption for IP over WDM network is introduced based on the network structure.Subsequently,the methods to reduce the energy consumption at network level are divided into different categories,whose fundamental principles and energy saving effects are summarized,and several typical energy-saving approaches are compared as well.Finally,the limitations of existing approaches are analyzed and some suggestions are provided for the further research directions.