共查询到17条相似文献,搜索用时 46 毫秒
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WDM光传送网的选路和波长分配算法 总被引:10,自引:1,他引:9
文章综述了波分复用(WDM)光传送网的选路和波长分配(RWA)算法;考虑了两种需求情况一种是从建立光路的需求出发,另一种是从运送分组业务的需求出发;还概述了RWA设计中要考虑的附加问题,包括波长变换、抗毁和服务策略. 相似文献
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WDM光传送网的设计与操作 总被引:1,自引:1,他引:0
综述一WDM光传送网的设计和操作问题,首先介绍了一些基本概念,然后给出了有关WDM光传送网的不同问题及其设计方法,最后描述了对WDM光传送网进行操作的一此算法。 相似文献
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波分复用光传送网及其关键器件技术 总被引:1,自引:0,他引:1
近年来通信流量增长非常快,尤其是以Internet为主的数据通信流量出现了爆炸式增长,保守的估计是每六个月翻一番。通信流量的急剧增长给传送网带来了很大的压力,许多光纤网络容量的使用率达到了70-80%,在某些情形严重的路由上,连备用容量也已经耗尽了。这迫使网络公司增加网络带宽,减小网络的拥塞。增加带宽的方法主要有: 相似文献
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WDM网络中支持QoS的路由与波长分配算法 总被引:1,自引:1,他引:1
针对波分复用(wDM)网络中的路由与波长分配问题。提出了一种支持服务质量(QoS)的约束搜索算法。基于多目标规划模型,这种搜索算法可为网络各节点创建路由表,根据路由表信息求出非支配路径集合,从而一次性完成寻找路由和分配波长两项任务。仿真实例证明了该算法的有效性。 相似文献
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This paper addresses the problem of multicast wavelength assignment for sparse wavelength conversion (MWA-SWC) in wavelength-routed wavelength-division-multiplexing (WDM) networks. It aims to optimally allocate the available wavelength for each link of the multicast tree, given a sparse wavelength conversion network and a multicast request. To our knowledge, little research work has been done to address this problem in literature.In this paper, we propose a new technique called MWA-SWC algorithm to solve the problem. The algorithm first maps the multicast tree from the sparse conversion case to the full conversion case by making use of a novel virtual link method to carry out the tree mapping. The method provides a forward mapping to generate an auxiliary tree as well as a reverse mapping to recover the original tree. Applying the auxiliary tree, we propose a dynamic programing algorithm for the wavelength assignment (WA) aiming to minimize the number of wavelength converters (NWC) required. Simulation results show that our new algorithm outperforms both random and greedy algorithms with regard to minimizing the NWC. Testing on various scenarios by varying the number of wavelength conversion nodes in the tree has confirmed the consistency of the performance. The primary use of the MWA-SWC algorithm is for static traffic. However, it can also serve as a baseline for dynamic heuristic algorithms. Typically, the MWA-SWC algorithm will provide great benefit when the number of available wavelengths on each link of the multicast tree is relatively large and the performance advantage is significant. 相似文献