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1.
《电子科技文摘》2000,(5)
Y2000-62073-382 0007953通信量模拟和应用(含7篇论文)=Session S11:trafficmodeling and applications[会,英]//1999 IEEE Interna-tional Conference on Communications,Vol.1 of 3.—382~420(H)本部分7篇论文的内容有:长距离相关通信量的多分数分析和模拟,产生自相似通信量的多信源叠加模拟,MIGI∞到达过程的内插近似,应用 QTES 方法论的宽带网络数据的自动摸拟,无线 ATM 网络多通信量呼叫进网策略参数的性能分析和估计,基于快速测量网络模拟的通信量模型的自动产生,点对多点最好互联的呼叫进网控制。 相似文献
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自相似网络通信量模型研究综述 总被引:7,自引:0,他引:7
越来越多的研究表明网络通信量不是Markov过程,而是在任意时间尺度上都具有突发特性,即自相似特性。描述网络通信量的数学模型主要有自相似和长相关结构。网络的某些参数服从重尾分布,从而导致网络通信量时间尺度上的突发特性。该文分析了传统网络通信量模型和性能分析的弊端,描述了新型网络通信量模型应该具有的基本特征。本文重点研究了网络自相似通信量相关的ON/OFF模型、用户访问概率模型和网络流量闭环模型,讨论了相关的研究方向,并总结了在研究网络通信量模型的过程中应该注意的原则和问题。 相似文献
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首先讨论了自相似网络通信量预测对于网络性能分析和网络资源利用率提高的重要意义,然后利用改进的Wiener-Kolmogorov方法来进行自相似网络通信量的非参数预测,最后研究了该预测方法在多媒体实时传输中的应用。 相似文献
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网络通信业务量的标值更新模型 总被引:2,自引:1,他引:1
本文利用标值更新过程,提出了一个较为通用的通信量统计模型。该模型可以对具有任意带宽分布和递减非凸自相关函数的通信量提供直接的拟合,不仅可以用于通信量的模拟,也可用于理论分析。讨论了该模型在通信量模拟中的应用,具有参数估计算法简单的特点,最后将该模型用于ATM网络中的可变比特率视频源的模拟,数值结果表明其具有良好的模拟性能。 相似文献
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研究了自相似网络通信量的统计复用策略。首先讨论了在采用FIFO(First In First Out)服务策略且缓存趋于无限大时,满足一定溢出概率要求的统计复用带宽要求,然后对这种情况进行了仿真分析。研究表明网络通信量的自相似特性对复用增益有较大的影响,并且自相似性越强、复用通信量数量越大,所取得的复用增益越大,这对于网络设计是很重要的。 相似文献
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近年来,大量研究表明,网络业务流量呈现长相关、自相似的特性,采用ON/OFF源模型生成自相似流能够比较真实地反映现实网络中的业务流量。光突发包的汇聚算法是光突发交换的关键技术之一,利用ON/OFF模型生成的自相似流对几种典型的OBS汇聚算法进行研究。仿真表明,不同算法对自相似的影响不同。 相似文献
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网络流量建模是网络规划与性能评价的重要基础,传统的业务模型大多基于泊松模型和马尔可夫排队模型,只具有短程相关性,随着网络业务的不断研究发现,实际网络业务流在很长的时间范围内都具有长程相关性,即一种自相似性。本文采用RMD算法和Fourier变换法对网络流量的自相似模型-FBM模型进行了建模及仿真研究,生成了所需的自相似流量序列。然后分别采用R/S法和方差时间图法对其进行自相似参数检测。结果验证了仿真算法所产生的序列存在着自相似性,并同时对RMD算法和Fourier变换法的优缺点进行了分析。 相似文献
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自相似业务流的快速生成方法及其性能研究 总被引:4,自引:2,他引:2
网络中业务流的自相似性正日益受到重视,因为它对网络性能有着很大的影响。在缺乏对自相似模型进行数学分析的情况下,计算机仿真成为当前最有效的研究手段。FGN(FractalGaussianNoise)是目前使用最为广泛的一种自相似模型,本文提出了一种基于其定义的快速生成算法,具有良好的运算速度和精度。 相似文献
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分形高斯噪声FGN是分形布朗运动的增量过程,广泛应用于自相似过程的建模分析。在众多的合成分形高斯噪声的方法中,研究了基于功率谱的FGN的生成算法,谱模拟方法和Paxson方法的特点以及联系.同时对基于功率谱的Hurst指数的估计方法,周期图法进行了讨论。仿真试验中,使用Paxson方法生成了FGN序列数据.试验结果表明生成的FGN具有很好的自相似性。应用周期图法估计了其Hurst指数,相比方差时间法,周期图法在估计长相关过程的参数方面能够提高精度。 相似文献
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随着网络应用的发展,网络流量不断加大,对于网络应用系统的测试也占有越来越重要的地位.良好的网络流量模型能较为真实的反映网络的情况,并能给与应用系统更为全面的测试.根据统计学的结果表明,网络流量在时间上具有自相似性.因此,对自相似流量模型的研究十分重要.为了克服单机生成网络流量的不足,本文对于分形高斯噪声(FGN)模型的算法进行了改进,使其能够并行且高速的生成自相似样本.文中针对改进后的算法提出了分布式系统,并阐述了系统的整体结构和控制机制的设计与实现.本文的工作还包括实现了一个检测网络流量的检测端,并通过它来分析分布式系统所生成的样本.结果表明,本系统所生成的网络流量具有自相似性. 相似文献
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This paper presents a new method for the estimation and characterization of the expected teletraffic in mobile communication networks. The method considers the teletraffic from the network viewpoint. The traffic estimation is based on the geographic traffic model, which obeys the geographical and demographical factors for the demand for mobile communication services. For the spatial teletraffic characterization, a novel representation technique is introduced which uses the notion of discrete demand nodes. We show how the information in geographical information systems can be used to estimate the teletraffic demand in an early phase of the network design process. Additionally, we outline how the discrete demand node representation facilitates the application of demand-based automatic mobile network design algorithms 相似文献
12.
Harald Øverby 《Photonic Network Communications》2007,13(2):183-194
Optical packet switching (OPS) has emerged as a promising architecture for the future all-optical network scenario. In order
to have a successful deployment of OPS networks, several networking issues must be resolved, e.g., how to resolve contentions
and how to provide Quality-of-Service (QoS) differentiation. Such networking studies often rely on teletraffic analysis in
order to quantify the performance of the OPS network. In this paper, we introduce new and review existing traffic models for
slotted buffer-less OPS networks. In particular, we present a novel asymmetric traffic model, suitable for studying the effects
of non-uniform traffic. Optical packet switches with and without wavelength conversion are studied. Numerical evaluations
and a comparison study of the presented traffic models are reported. The main contributions of this paper are to advance the
field of establishing a theoretical framework for slotted OPS networks and to act as a tutorial for teletraffic engineering
in such networks.
http://www.item.ntnu.no/~haraldov. 相似文献
13.
该文提出了一种新的缓冲区分配方法,即动态神经共享 (Dynamic Neural Sharing,DNS)方法。这种方法利用反向传播算法合理分配缓冲区资源,从而减少自相似业务的分组丢失率。通过两组仿真实验发现,与完全分割(Complete Partitioning, CP), 完全共享(Complete Sharing, CS), 部分共享(Partial Sharing, PS)这些传统的缓冲区分配方法相比,DNS在减少分组丢失和体现公平性(每个源都占有一定数量的缓冲区资源)之间达到了更好的平衡。 相似文献
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Abdulaziz S. Al‐Ruwais 《International Journal of Network Management》2002,12(4):203-211
The teletraffic capacity of a CDMA mobile network with adaptive antennas at the receiver base station is considered and a simplified expression for the system outage probability associated with the teletraffic capacity is obtained. Analytical as well as numerical results show that the outage probability, and consequently the teletraffic capacity of the system, is improved using adaptive antennas at the receiver base station. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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Evaluates four handoff priority-oriented channel allocation schemes. These give priority to handoff calls by reserving channels exclusively for handoff calls. The measurement-based handover channel adaptive reassignment scheme (MHAR-A) exclusively uses reserved handover channels for newly originated calls if a certain criterion is satisfied. All four schemes studied differ from the conventional guard channel-based handover priority-oriented channel allocation scheme. To study the schemes, a personal communication network (PCN) based on city street microcells is considered. A teletraffic simulation model accommodating a fast moving vehicle is developed, and the performance parameters are obtained. The performances of all four schemes are compared with the nonpriority scheme and the conventional guard channel-based handover priority-oriented channel allocation scheme. It was found that some of the channel allocation algorithms studied improved the teletraffic capacity over the nonpriority and the conventional guard case. Also, the probability of new call blocking and carried traffic was improved for three of the schemes when compared to the conventional guard scheme. The MHAR-A scheme did not perform up to expectation. Nevertheless, it can be used to finely control the communication service quality equivalent to the control obtained by varying the number of handoff channels in a fraction of one. Increasing the number of reserved handover channels in fraction of one can never be achieved in the conventional guard channel-based handover priority-oriented channel allocation scheme 相似文献
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Bing‐Yi Zhang Ya‐Min Sun Yu‐Lan Bian Hong‐Ke Zhang 《International Journal of Communication Systems》2006,19(1):53-65
It is difficult to give an accurate judgement of whether the traffic model fit the actual traffic. The traditional method is to compare the Hurst parameter, data histogram and autocorrelation function. The method of comparing Hurst parameter cannot give exact results and judgement. The method of comparing data histogram and autocorrelation only gives a qualitative judgement. Based on linear discriminant analysis we proposed a novel arithmetic. Utilizing this arithmetic we analysed some sets of data with large and little differences. We also analysed some sets of data generated by network simulator. The analysis result is accurate. Comparing with traditional method, this arithmetic is useful and can conveniently give an accurate judgement for complex network traffic trace. Copyright © 2005 John Wiley & Sons, Ltd. 相似文献