共查询到19条相似文献,搜索用时 78 毫秒
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对通信网络的大量研究表明,网络业务本质是自相似的(相关函数上表现为长相关特性)。网络业务的统计自相似性主要是指在不同时间尺度上观测到的业务流量序列具有相同的统计特性。讨论了当前网络业务流的特性;分析了现有的自相似业务流模型。为在线测量网络中的高速业务流,根据实测时间序列数据建立合适模型提供了参考。 相似文献
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现有的业务流模型难以描述高速业务流的高突发性,在线测量网络中的高速业务流,再根据实测的时间序列数据,用RMD方法建立并分析高速业务流的自相似模型。RMD模型自相关函数的近似程度较好,可以较好的模拟业务量。 相似文献
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针对WiMAX网络业务流的自相似特性,提出用M/Pareto模型来对网络业务流进行建模,通过M/Pareto模型和FBM业务流模型之间统计性质得到2个模型间的参数映射关系,推导出基于M/Pareto模型参数的有效带宽计算公式,据此设计出一个自相似接纳控制算法(SS-CAC)。该算法避免了通过测量的方法来获取FBM业务流模型中参数值,又适应了WiMAX网络流自相似这一特性,使得计算的有效带宽更加精确和方便,提高了系统资源利用率。仿真结果表明,该算法极大地提高网络的带宽利用率,降低了系统的呼叫阻塞率。 相似文献
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《中国无线电电子学文摘》2002,(5)
TN91 02050727自相似过程的合并和分解过程/薛质,施建俊,李建华(上海交通大学)11上海交大学报.一2 001,35(11)一1603一1606对LAN、ISDN的信令信道和其他通信系统中的数据统计分析表明,在宽带网络中的业务流具有自相似特性,它将对网络的设计、控制和分析产生影响,而业务流的合并和分解是网络中业务流的两个基本操作,要研究业务量的自相似特性对网络整体性能的影响,就必须首先研究它们的性质.文中给出了自相似序列经过合并和分解后仍然保持自相似性的充要条件,该结论对进一步研究网络业务量的自相似性对网络性能的影响有理论指导意义.参3(… 相似文献
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现代实际网络业务相比传统业务更为复杂,在各个时间尺度下表现出自相似的突发特性(相关函数上表现为长相关特性)。我们可以在线测量网络中的高速业务流,再根据实测时间序列数据,用RMD方法建立并分析高速业务流的自相似模型。RMD算法速度快,同时能很好的匹配业务流的自相似特性。 相似文献
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随着电信网业务量和业务种类的迅速增加,电信网络正变得越来越复杂,对网络的运行、管理和维护(OAM)也提出了更高的要求。为此,电信传输网作为提供电信服务的基础设施,必须有效地加以管理和操作,为用户提供优质低价的电信服务。文章描述了在此情况下传输网通道层的OAM及其发展。 相似文献
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Anagnostou M.E. Sanchez-P. J.-A. Venieris I.S. 《Communications, IEEE Transactions on》1996,44(10):1243-1246
The asynchronous transfer mode (ATM)-based broadband integrated services digital network (B-ISDN) dominates the research interest in telecommunications. Traffic and network modeling are the techniques used for performance evaluation and assessment of B-ISDN design alternatives and planning. The specific nature of the ATM technique requires new approaches for traffic modeling. Selecting appropriate traffic source models is an important issue, since it is closely related to the successful design and efficient performance of the networks to be built in the future. The source (multilevel, multiservice structured Markovian) model presented provides a simple way for characterizing the behavior of a telecommunication user recognizing the multilevel discipline of a telecommunication session. The traffic model is general enough to fit a variety of different services by appropriately varying the values of the parameters defining it, but also it is simple enough because it is described by a small number of parameters and the defining parameters make a good intuitive sense by being closely related to actual physical quantities 相似文献
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Evaluating Reliability of Telecommunications Networks Using Traffic Path Information 总被引:1,自引:0,他引:1
We propose a reliability model for representing telecommunications networks that does not focus on topological information, but rather traffic path information. Mapping from traffic paths to physical elements and capacities enables the model to express simply how terrible performance degradations occur. Existing models, such as probability graph models, and probability-capacity graph models, do not adequately address actual telecommunication network designs. The probability graph model never considers performance degradations, while the probability-capacity model unreasonably assumes that we can estimate performance degradations from only the network topology. This paper also proposes an algorithm for evaluating the reliability of our new model. A numerical example shows that the algorithm is reasonably efficient for even large telecommunications networks. 相似文献
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分析了超量呼叫和难以到达地区这两种突发话务对电信网络性能的影响 ,重点介绍了如何在EWSD交换机中针对不同的网元位置实现相应的网络话务控制。 相似文献
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The paper presents a new switching architecture to improve telecommunications reliability. The architecture is partitioned depending on the type of network used, reliability requirements, and expected traffic in the network. The partition size depends on the network reliability, bandwidth, and traffic. A reliability model for a telecommunication architecture is used to partition the network and to improve end-to-end reliability. The model defines critical components in the networking architecture and their connections. The component connections permit the propagation of faults from the component in which the fault originates to the other components. This propagation can cause failures in the chain (or in the tree) of components. The partitioned architecture limits the propagation of faults, simplifies fault detection, and preserves reliability of the remaining partitions. Examples of different networks are used to show the applications of the model 相似文献
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电信网发展的战略趋势 总被引:1,自引:0,他引:1
本文概要论述了笔者对未来电信网发展的战略趋势的看法,主要涉及网络业务的数据化趋势,网络的宽带化趋势,网络的光纤化趋势,网络接入的无线化趋势,网络的分组化趋势以及三网融合的大趋势。 相似文献
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基于区分服务的IP-UMTS视频传输QoS机制 总被引:2,自引:1,他引:1
为了满足在以IP作为骨干网协议,以通用移动通信系统(UMTS)作为接入网的异构网络环境中视频传输的服务质量要求.提出了基于区分服务的视频传输服务质量机制,给出了区分服务业务等级到视频数据帧和区分服务业务等级到UMTS业务类别的映射关系.使用仿真的实验环境对给定的服务质量机制进行了测试,实验结果表明该服务质量机制能有效地提高IP-UMTS异构网络中视频传输的服务质量. 相似文献
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In this paper we consider designing a high-speed virtual private network using a combination of heterogeneous telecommunication services. In particular, we consider mixing SMDS access lines and point-to-point digital leased lines to construct a virtual private network at minimum cost. We develop a nonlinear combinatorial optimization model and a simulated annealing algorithm to find a high-performance, low-cost network design. We compute lower bounds on cost savings from using mixed services as opposed to pure SMDS based on actual tariffs and realistic traffic. 相似文献