共查询到19条相似文献,搜索用时 62 毫秒
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在支持具有不同优先级和不同Qos需求的多业务网络中,抢占是带宽分配和管理的有效策略,但抢占也对网络造成了振荡。在路由策略中引入抢占信息可最小化重路由,提高网络的稳定性。本文在分析MPLS网络现有路径选择策略和抢占策略的基础上,提出一个最小化抢占的带宽约束路径选择算法。其基本思想是在路径选择中考虑低优先级LSP的资源预留信息,在链路开销函数中引入抢占信息即将被抢占的带宽和将被影响的最高优先级。我们的算法能在最小化抢占和重路由的同时实现负载均衡,有效地改善全局网络性能。 相似文献
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近年来,ATM网络中路由发现和拥塞控拆的资源优化分配方法正在得到广泛的关注。本提供的解决方案是基于神经网络策略的。中描述的方案采用多变量约束优化算法来处理ATM网络中UNI/NNI(用户网络接口/网络网络接口)的业务需求,从而找到近似最佳的PVC/SVC(永久虚电路/交换虚电路)路由。自动回归反向传播网络的预知流量规定、、用户定义的业务参数以及网络负荷条件等都限制了优化的程度。利用计算机仿真神 相似文献
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袁捷 《电信工程技术与标准化》2002,(4):77-83
在IP骨干网络的规划设计中,必须考虑网络层次的区分,目前较常见的做法是将网络划分为:核心层、汇接层和接入层,对应于不同的网络层次,分别进行不同的网络路由设计。本针对IP骨干网设计中的具体实例,对网络中域内路由和域间路由的负载均衡设计作出相关方面的探讨。 相似文献
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基于共享风险链路组(SRLG,shared risk link group)和流量均衡的概念,研究了光网络抗毁设计中基于流量均衡的SRLO尽量分离路由问题,利用网络流量的实际分布来评价链路和SRLG重要性,提出基于流量均衡的SRIG分离算法TBDR.通过计算机仿真表明,TBDR算法性能优于保护路优先算法,该算法能有效降低网络阻塞率,提高网络资源利用率和网络抗毁能力,达到流量均衡的目标. 相似文献
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智慧协同网络中基于流量矩阵的负载均衡路由机制 总被引:2,自引:0,他引:2
智慧协同网络具有能够实时准确测算流量矩阵的特点。将流量矩阵作为约束,对负载均衡路由优化问题进行建模,利用拉格朗日对偶方法,将原问题转化为优化目标易实现的对偶问题。为实现对偶问题优化目标,提出一种基于流量矩阵的负载均衡路由 (TM-LB,traffic matrix based load balancing) 算法,供控制层根据实时网络情况为后续流规划传输路径。利用OMNET++仿真器在NFSnet拓扑结构上进行仿真实验,结果表明TM-LB相比传统路径规划机制能有效避免拥塞,实现负载均衡。最后,搭建原型系统对TM-LB算法的开销进行测试。 相似文献
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随着因特网业务的迅猛发展,流量工程技术正成为优化网络资源和提高网络性能的关键技术。本文介绍了流量工程的基本概念度其重要性,详细分析GMPLS对MPLS的路由协议和信令协议所作的流量工程扩展,并讨论了基于GMPLS网络中实现集成流量工程的可能性和优势。 相似文献
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混沌周期解提高测量灵敏度算法及抗干扰分析 总被引:8,自引:0,他引:8
混沌动力学系统具有初始条件的极端敏感性,当参数空间发生漂移时,系统的解空间将出现很大的变化.以Feigenbaun映射为例,分析了参数引起的分叉行为,提出利用混沌周期解提高测试系统灵敏度的方案.调整参数使测试系统工作在周期解的区域,根据参数敏感激发混沌系统周期数变化,设计了测量算法改善测量的精度和灵敏度,对混沌系统的抗干扰性进行了分析. 相似文献
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In recent years, wireless communication sys-tems have experienced tremendous growth in data traf-fic. Many capacity-enhancing techniques are applied to elevate the gap between the amount of traffic and net-work capacity, and more solutions are required to mini-mize the gap. Traffic allocation among multiple net-works is regarded as one of the most effective methods to solve the problem. However, current studies are una-ble to derive the quantity of traffic that each network should carry. An intelligent traffic allocation algorithm for multiple networks is proposed to obtain the optimal traffic distribution. Multiple factors affecting traffic dis-tribution are considered in the proposed algorithm, such as network coverage, network cost, user habit, service types, network capacity and terminals. Using evalua-tions, we proved that the proposed algorithm enables a lower network cost than load balancing schemes. A case study of strategy making for a 2G system refarming is presented to further illustrate the applicability of the pro-posed algorithm. We demonstrated that the new algorithm could be applied in strategy making for telecommunica-tion operators. 相似文献
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A Minimizing Algorithm for Sum of Disjoint Products 总被引:4,自引:0,他引:4
This paper describes a minimizing version of the Abraham sum-of-disjoint products (sdp) algorithm, called the Abraham-Locks-Revised (ALR) method, as an improved technique for obtaining a disjoint system-reliability formula. The principal changes are: 1) Boolean minimization and rapid inversion are substituted for time-consuming search operations of the inner loop. 2) Paths and terms are ordered both according to size and alphanumerically. ALR reduces the computing cost and data processing effort required to generate the disjoint system formula compared to the seminal 1979 Abraham paper, and obtains a shorter formula than any other known sdp method. Very substantial savings are achieved in processing large paths of complex networks. 相似文献
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This paper defines a formal framework for the definition of dynamic grooming policies in IP over optical networks. The formal framework is then specialized for the Overlay Architecture, where the control plane of the IP (Internet protocol) and optical levels are separated, and no information is shared between the two.We define a family of grooming policies for the Overlay Architecture based on constraints on the number of hops and on the bandwidth sharing degree at the IP level, and we analyze the performances as a function of the grooming parameters in regular and irregular topologies.Results are derived using realistic traffic models that depart from the circuit-like traffic traditionally used in grooming studies. 相似文献
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为了减少将合法邮件误判为垃圾邮件的误报率及将垃圾邮件误判为合法邮件的漏报率的损失,首先基于现有的文本特征提取评估函数:期望交叉熵及互信息提出一种新的评估函数。利用此函数可提取到更具有代表性的邮件特征向量。在此之上提出一种基于贝叶斯公式可减少损失的垃圾邮件过滤方法。经过仿真测试后,发现基于新评估函数的新方法可有效降低误报率和漏报率。 相似文献