IP over WDM网络中能耗自感知的混合疏导专有保护算法

针对绿色生存性IP over WDM网络中资源开销大、网络阻塞率高的问题,提出一种能耗自感知的混合疏导专有保护(HG-PA-DPP)算法。首先在IP层的核心路由器对低粒度业务请求集中疏导;然后通过实时感知WDM层的链路负载和双层器件带来的链路能耗状态定义链路权值,基于分层图在不同波长平面上为各业务请求寻找权值小且链路分离的工作路径和保护路径,同时在业务的中间节点处对不需要光-电-光转换的光路进行光旁路处理;最后,将空闲或保护资源设置为休眠模式以实现节能。仿真结果表明,所提算法在高负载时有着更好的节能效果,且在大网络拓扑下资源开销(RO)为传统算法的76.5%,阻塞率(BP)仅为传统算法的61.1%。

Dedicated path protection algorithm with power-aware hybrid grooming strategy in IP over WDM networks

In order to solve the issue of high blocking probability and large res ource overhead in the green and survivable IP over wavelength division multiplex (WDM) networks,a novel heurist ic algorithm of hybrid grooming of power-aware with dedicated path protection (HG-PA-DPP) is propos ed.Firstly,the small-granularity traffic demands are centralized grooming by the core routers in IP layer.Then,the cost of links is defined by jointly perceiving the real-time load of links in WDM layer and ener gy consumption of links in both layers.The working and backup paths with link disjoint and low cost are searche d on different wavelength planes based on layered graph,and the intermediate nodes can be bypassed because optic al-electrical-optical (O-E-O) conversion is not required.Finally,the idle or backup resources will be set to the sleep mode for realizing power saving.Simulation results show that compared with traditional algorithm,the p roposed algorithm has better energy efficiency under the high network load,which has only 76.5% resource ove rhead and 61.1% blocking probability in large network topology.