共查询到19条相似文献,搜索用时 62 毫秒
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针对如何选择一个优化的P圈来达到最小化空闲容量和较高的计算速度这个问题,提出了一种新的启发式算法HPS-RSC(迭代选择和简化一系列P圈),通过在EON和USA两种网络拓扑图中的仿真结果表明,这种新的算法使冗余度的范围控制在3.5%以内,并且在较大的网络中这种算法的优越性更加明显. 相似文献
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生存性是WDM(波分复用)光网络的核心技术之一,对多播业务而言,IpC(智能P圈保护)是一种具有快速、高效等特点的保护算法。文章提出一种EIpC(增强型智能P圈)保护方案,包括分段和路径IpC算法,分段和路径IpC算法分别为每个分段和路径寻找新的P圈。理论分析和仿真结果表明,路径IpC在资源利用率、P圈构造个数以及圈平均覆盖度等方面最优,分段IpC次之,传统(链路)IpC最低。在先验效率方面,链路IpC最优,分段IpC次之,路径IpC最低。 相似文献
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IP voer WDM光网络及其生存性问题讨论 总被引:4,自引:2,他引:2
本文介绍了IP voer WDM光网络的演进过程与发展趋势;讨论了其生存性问题,包括光层生存性有关概念、分类及各自的优缺点,IP/MPLS层与WDM层联合生存机制的必要性以及这种联合机制需要解决的竞争问题=带宽资源共享问题和失效扩散问题等。 相似文献
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P圈的出现为在格状WDM光网络中实现快速的故障恢复提供了一种很吸引人的方案,P圈法兼有环网快速的保护倒换速度和格状网络有效的资源利用率这两大特点。从P圈的基本概念、P圈的主要特点以及P圈的配置等几个方面出发对在格状WDM网络中使用P圈法实现网络保护的方案进行了介绍。 相似文献
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随着因特网、高速数据和多媒体业务的发展,许多服务提供商将面临容量危机。解决容量问题有许我方法。直接敷设光纤虽行之有效,但会涉及高昂的成本;在在于Sonet/SDH技术的传统时分网上直接提高速率,从长远看,在技术上会受到限制;密集波分复用由于其独特的技术特性,将会在此方面发挥巨大作用。 相似文献
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针对WDM(波分复用)光网络光层保护问题,提出了两种新的保护算法。这两种保护方法都属于ILP(整数线性规划),所处理的是通道失效问题,而不是链路失效问题,分别列出两种算法的步骤和计算结果。 相似文献
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To make dynamic traffic grooming faster and more efficient,and achieve an intelligent differentiated protection,a differentiated protection strategy with dynamic traffic grooming based on clustering(DPS-DTGC)was proposed.The whole network topology was allocated some clusters based on maximal independent set,in order to reduce the routing time consumption.Meanwhile,by the cooperation of layered auxiliary graph,residual capacity matrix and cluster aggregation layer,the traffic in inter- and intra- clusters would been groomed to realize the reasonable planning of resources and the higher efficiency of grooming.Furthermore,according to the proportion of different priority traffic in one wavelength ,the link importance was evaluated and a smart P-cycle was designed to give differentiated protection to the link.The simulation results show this strategy can make a better utilization of network resource.And with the increase of network load,it will gain a good performance in blocking rate. 相似文献
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In recent years, optical transport networks have evolved from interconnected SONET/WDM ring networks to mesh-based optical
WDM networks. Time-slot wavelength switching is to aggregate the lower rate traffic at the time-slot level into a wavelength
in order to improve bandwidth utilization. With the advancement of fiber-optics technologies, continual increase of fiber
bandwidth and number of wavelengths in each fiber, it is possible to divide a wavelength in a fiber into time-slots, and further
divide a time-slot into mini-slots so that the fiber bandwidth can be more efficiently utilized. This article proposes a router
architecture with an electronic system controller to support optical data transfer at the mini-slot(s) of a time-slot in a
wavelength for each hop of a route. The proposed router architecture performs optical circuit switching and does not use any
wavelength converter. Each node in the mini-slot TDM WDM optical network consists of the proposed router architecture. Three
different network topologies are used to demonstrate the effectiveness and behavior of this type of network in terms of blocking
probability and throughput. 相似文献