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Huei-Wen Ferng 《Communications Letters, IEEE》2004,8(7):470-472
Using a general input traffic class rather than confining it to a specific input traffic model, this letter investigates the split traffic for such a general input traffic class under a probabilistic routing algorithm. Thus the obtained result is applicable for a broad range of input traffic. By way of characterizing the split traffic on each routing path, it is shown that the resultant traffic on each routing path is still the same traffic class with suitable parameter modification. 相似文献
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网络流量反映了网络的运行状态,是网络管理领域中重要的研究课题。NetFlow是Cisco公司为实现统计流量而开发的一种协议,使用NetFlow可以方便地进行大规模的流量采集。通过对NetFlow协议原理与功能的分析,设计了一种NetFlow流量分析器。该分析器能够对NetFlow流量数据进行采集和分析,实现网络的异常流量监测、流量计费和综合流量分析,并能及时地发现网络攻击。 相似文献
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Chong-Kwon Kim 《Selected Areas in Communications, IEEE Journal on》1996,14(2):374-385
A multirate multicast switch, which can provide a single uniform switching function for vastly different classes of traffic, is crucial for the successful deployment of integrated broadband networks. We analyze the call blocking probability of heterogeneous circuit switched traffic in a multirate multicast switch using the arrival modulation technique. For the analysis, we introduce two simple traffic models: fan-out heterogeneous traffic and bandwidth heterogeneous traffic. The analysis of two simplified traffic models shows that calls of different characteristics interact in complex yet subtle ways. Our results on fan-out heterogeneous traffic show that the performance gap between large fan-out traffic and small fan-out traffic increases when two types of traffic are mixed. On the other hand, in bandwidth heterogeneous traffic, the performance gap between traffic of different bandwidth decreases. A further investigation indicates that the two types of interactions coexist in general heterogeneous traffic. We conclude the paper introducing several methods to improve the performance of multirate multicast traffic 相似文献
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Wenhong Tian 《Telecommunication Systems》2014,57(1):41-49
Recent studies show that both data traffic and real-time traffic grow very fast in wired and wireless networks. To provide better performance guarantee, these applications need efficient network modeling and planning. In this paper, the problem where the total bandwidth of a link is shared by streaming traffic (real time traffic such as voice or video etc.) and elastic traffic (such as data) is studied. Integrating streaming traffic and elastic traffic presents a unique dimensioning problem. This paper considers dimensioning a link to satisfy both quality of service (QoS) requirements for streaming traffic, such as loss probability, and elastic traffic, such as mean waiting (delay) time. The Erlang loss model is applied to streaming traffic and a bursty traffic model is applied to the elastic traffic. Efficient dimensioning algorithms based on classical Markovian models and time-scale decomposition are then proposed. Numerical results show that the proposed methods have good accuracy. 相似文献
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Much work has focused on traffic grooming in SONET/WDM ring networks. Previous work has considered many aspects of traffic grooming, including minimizing the number of ADMs, minimizing the number of wavelengths, considering different traffic models, using different network architectures, incorporating switching capability and so on. In this work, we study traffic grooming in unidirectional ring networks with no switching capability under both uniform traffic and non-uniform traffic models to reduce electronic multiplexing costs. Based on the clustering notion, we derive a general and tighter lower bound for the number of ADMs required in traffic grooming under the uniform all-to-all traffic model. This bound reduces to special cases obtained in previous work. We also derive general, tighter, and closed form lower bounds for the number of ADMs required under two non-uniform traffic models: the distance-dependent traffic model and the non-uniform symmetric traffic model. Cost-effective multi-phase algorithms that exploit traffic characteristics are then designed and studied to efficiently groom traffic streams under different traffic models. Our numerical and simulation results show that the proposed multi-phase algorithms outperform existing traffic grooming algorithms by using a fewer number of ADMs. Our algorithms in several cases also achieve the lower bounds derived. 相似文献
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基于人工电视监视的交通检测方法存在检测效率低、实时性差的缺点,提出了基于视频序列的交通参数和交通事件检测系统。将采集和预处理后的视频信号通过DSP处理,检测视频交通参数和交通事件,提取的交通参数和交通事件等分析结果通过TCP/IP网络传输协议传给视频分析识别终端,在视频分析识别终端上存储、显示交通参数与交通事件和视频信息,设置系统参数,同时可以进行查询、检索以及管理交通参数与交通事件。该系统实现了对车流量、车速、抛落物、行人和停车等交通参数与事件的实时性检测。 相似文献
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随着网络技术不断发展,网络管理者希望对网络流量实行有效管理。在分析当前网络流量和CATV宽带网特征的基础上,提出一种CATV宽带网的流量管理方案,并对该方案采用的客户端/服务器/数据库3层分布式结构进行较为详细的描述。 相似文献
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随着我国城市现代化水平的不断提高和经济的快速发展,交通供需矛盾日渐突出,道路交通网络十分脆弱,一旦发生突发事件,极易引发大面积交通拥堵甚至瘫痪,这将引发严重的社会危害。因此,研究突发事件下城市路网交通应急方案具有重要意义。本文在BA网络模型的基础上重现突发事件下的交通拥堵的形成过程,收集形成过程中产生的各项特征参数,分析交通拥堵的形成机理。最后,提出了应对突发事件下交通拥堵的交通路径策略,从而降低突发事件对网络交通的影响。 相似文献
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网络流量的测量是流量矩阵估算数据来源的基础。在全面总结了当前的流量测量技术的基础上,从流量矩阵估算的角度提出了一种流量测量模型,引入了适用于流量矩阵估算的测量服务和数据服务的概念,同时对模型的通信机制和数据存储机制进行了探讨,该模型的实现对流量矩阵估算具有非常重要的意义。 相似文献
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This paper quantitatively analyzes the queueing delay of the constant-bit-rate (CBR) traffic in a multiplexer, where the CBR traffic is mixed with the traffic of another session (interfering traffic) that has throughput and burstiness constraints. This paper focuses as a quality-of-service (QoS) measure on the fraction of the CBR traffic that fails to meet a certain delay requirement. Results include the worst-case QoS of CBR traffic as a function of the throughput and burstiness parameters imposed on the interfering traffic. Results of this paper can be applied to traffic management and call processing of asynchronous transfer mode (ATM) networks 相似文献
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交通灯的识别对人工智能以及无人驾驶都有着举足轻重的作用,本文研究交通识别中的红绿灯判断,用于改善驾驶员疲劳以及维护交通秩序从而提高驾驶安全系数减少交通事故的发生。通过机器视觉采集红绿灯交通信号图,运用M atlab进行图片处理截取红绿灯区域,提取每张图片的121个像素点RGB值,运用1和2分别表示绿灯和红灯,建立红绿灯样本训练库,通过Matlab自带的数据拟合工具nftool进行神经网络训练,调整训练、验证、测试数据比例,最终得到识别效果较好的神经网络算法。运用样本均值进行测试也能够得到较好的识别。 相似文献
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Mengyang Huang Menggang Zhu Yunpeng Xiao Yanbing Liu 《Digital Communications & Networks》2021,7(1):72-81
Predicting travel trajectory of vehicles can not only provide personalized services to users, but also have a certain effect on traffic guidance and traffic control. In this paper, we build a Bayonet-Corpus based on the context of traffic intersections, and use it to model a traffic network. Besides, Bidirectional Gated Recurrent Unit (Bi-GRU) is used to predict the sequence of traffic intersections in one single trajectory. Firstly, considering that real traffic networks are usually complex and disorder and cannot reflect the higher dimensional relationship among traffic intersections, this paper proposes a new traffic network modeling algorithm based on the context of traffic intersections: inspired by the probabilistic language model, a Bayonet-Corpus is constructed from traffic intersections in real trajectory sequence, so the high-dimensional similarity between corpus nodes can be used to measure the semantic relation of real traffic intersections. This algorithm maps vehicle trajectory nodes into a high-dimensional space vector, blocking complex structure of real traffic network and reconstructing the traffic network space. Then, the bayonets sequence in real traffic network is mapped into a matrix. Considering the trajectories sequence is bidirectional, and Bi-GRU can handle information from forward and backward simultaneously, we use Bi-GRU to bidirectionally model the trajectory matrix for the purpose of prediction. 相似文献
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Maesschalck Sophie De Colle Didier Lievens Ilse Pickavet Mario Demeester Piet Mauz Christian Jaeger Monika Inkret Robert Mikac Branko Derkacz Jan 《Photonic Network Communications》2003,5(3):203-225
The traffic to be carried by today's European backbone networks increases very rapidly. An important portion of this traffic consists of data traffic (mainly IP-related). In the future data traffic is expected to become the abundantly dominant traffic type, while voice traffic will only account for a very small portion of the total traffic volume. In this paper, some network topologies for such a pan-European fiber-optic backbone network are presented (more details can be found in [1]). These topologies are compared in terms of the efficiency of the network design both from a cost and capacity point of view and in terms of the availability of the connections routed over this network. In order to be able to assess the network topologies under realistic circumstances, the expected traffic demand is forecasted. This enables to make the comparison for the current traffic volume as well as for the traffic patterns of the future. As not all types of (data) traffic require the same degree of survivability and in order to leverage the total capacity cost of the network design, a distinction is made between different recovery options in the optical layer for the different traffic types considered. 相似文献
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为了有效避免网络拥堵,文中提出基于大数据分析技术的海量网络流量建模与预测分析方法,准确预测网络流量数据。首先利用经验模态分解处理网络流量数据,获取模式函数分量,分析网络流量的短相关性,然后通过确定数据平稳性、计算平稳时间网络流量序列的自相关系数和偏自相关系数,建立网络流量的预测模型,最后进行了网络流量的仿真实验,实验结果表明,该方法可以描述网络流量的变化特点,获得高精度的网络流量预测结果,预测结果均方误差低于5%。 相似文献
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McMahon G. Septiawan R. Sugden S. 《Selected Areas in Communications, IEEE Journal on》2004,22(3):501-507
Modern telecommunication networks are characterized by a heterogeneous mix of traffic classes, ranging from traditional telephone calls to video and data services. Therefore, there is a need to solve the traffic allocation problem with different quality-of-service (QoS) requirements, wherein each traffic demand is fulfilled. This paper investigates the possibility of allocating loaded traffic in a low earth orbital (LEO) satellite network by considering multiservice traffic. Both Poisson and Markov models are used for the incoming traffic, which includes multiservice requirements. By introducing a privilege parameter, a quantum of bandwidth can be reserved for high priority traffic and a better QoS can be given for this traffic. The algorithm performs well for both traffic patterns tested. Simulation results are presented. 相似文献