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1.
Traffic characterization is an important means for Internet Service Providers (ISPs) to adapt and to optimize their networks to the requirements of the customers. Most network measurements are performed in the backbone of these ISPs, showing both, residential and business Internet traffic. However, the traffic characteristics of business and home users differ significantly. Therefore, we have performed measurements of home users at a broadband wireless access service provider in order to reflect only home user traffic characteristics. In this paper, we present the results of these measurements, showing daily traffic fluctuations, flow statistics as well as application distributions. The results show a difference to backbone traffic characteristics. Furthermore, we observed a shift from web and Peer-to-Peer (P2P) file sharing traffic to streaming applications.  相似文献   

2.
Attack Vulnerability of Complex Communication Networks   总被引:2,自引:0,他引:2  
The Internet has been studied as a typical example of real-world complex networks. In this brief, we study the traffic performance of the Internet when it encounters a random or intentional attack. Different from previous approaches, the congestion control protocols are considered so that the bandwidth can be reallocated among flows. In this way, cascading breakdown is less likely to happen. The flow rates are adjusted when a node is attacked and out of function. Consequently, the traffic utility and the utilization ratio of bandwidth are affected. We compare the real Internet data with the classic random graph and scale-free network models. The simulated results also show that the ldquorobust yet fragilerdquo property previously observed in the study of cascading failures in the scale-free networks is still valid in this scenario.  相似文献   

3.
本文的主要工作是建立基于MPLS的流量工程模型.在商业运行的网络中,通过对已投资设施的充分利用获取竞争优势和商业回报的要求使得流量工程日益成为网络运营中不可缺少的手段.通过借鉴TCP和ATM的优点,结合面向连接和面向非连接两种处理方法的长处,建立一种基于MPLS的流量管理模型,该模型的特点是:管理功能模块边缘化,运输功能模块平面化,在高速,简单的运载核心上运行一个可管理的流量承载平台.模型的有效性通过两个方法得到评估.一是从形式上证明了模型运行状态的稳定性,完备性和对于时间轴的收敛性.二是使用Network Simulator建立模拟的网络环境验证对网络运行状态的优化结果.本文的工作基于以下重要概念:基于聚集的流量、流聚集、流量聚集点和流量分解点、扩充的链路耗费参数定义(承载能力占用率)、分布式公平队列等.  相似文献   

4.
Next-generation broadband satellite networks are being developed to carry bursty Internet and multimedia traffic in addition to the traditional circuit-switched traffic (mainly voice) on a global basis. These satellites provide direct network access for personal applications as well as interconnectivity to the terrestrial remote network segments. The main requirement in success of these networks is that they should be able to transmit high data rate traffic with prescribed quality of service (QoS). Thus, the broadband satellite network has no choice other than the rise of ATM technology and to be optimized for Internet-based traffic. ATM is the promising technology for supporting high-speed data transfer potentially suitable for all varieties of private and public telecommunications networks. IP, on the other hand is the fast-growing Internet layer protocol that is applicable over any data link layer Internet-based applications are the emerging source of traffic in the future wireless networks and broadband satellite networks should consider Internet as the primary service. In this paper, we discuss the traditional ATM and wireless ATM networks and explain the characteristics of the wireless IP networks. The paper then uses those concepts in defining the criteria for the broadband satellite networks such as the QoS and traffic management. Application of the broadband satellite networks is also proposed  相似文献   

5.
Consumer interest in accessing the Internet for browsing the World Wide Web has exploded in the past two years. The current narrowband residential Internet access infrastructure using dial-up through the PSTN not only is too slow, but also leads to high service blocking probability. Hence, providing an “always-on” high-speed Internet access service has been viewed as the new killer application for residential broadband networks. Residential broadband Internet service design requires understanding of the networking requirements of broadband Internet applications. This article provides a framework for characterizing applications requirements in general, with special emphasis on Internet applications such as Web browsing. The author presents a classification of applications based on their networking requirements, and discusses the traffic and quality of service requirements for each application class  相似文献   

6.
Traditional traffic identification methods based on well‐known port numbers are not appropriate for the identification of new types of Internet applications. This paper proposes a new method to identify current Internet traffic, which is a preliminary but essential step toward traffic characterization. We categorized most current network‐based applications into several classes according to their traffic patterns. Then, using this categorization, we developed a flow grouping method that determines the application name of traffic flows. We have incorporated our method into NG‐MON, a traffic analysis system, to analyze Internet traffic between our enterprise network and the Internet, and characterized all the traffic according to their application types.  相似文献   

7.
丁炳辰  李卫忠  唐永康 《电子学报》2017,45(11):2742-2753
修复带宽最优并不代表修复通信量也是最优的,后者与物理网络拓扑有着密切联系.本文基于路由编码的思想减少修复通信量.首先,基于信息流图对物理网络中数据的传递过程进行建模,证明得出了满足路由编码可行的充要条件,并发现路由编码可以基于再生码实现.然后,针对数据中心网络设计的特点,为Fat-tree设计了一个工作在应用层的协议来生成修复树,为CamCube设计了一个启发式算法来生成修复树.关于最小存储再生码的数据修复过程的仿真实验表明,路由编码可以有效地降低修复通信量,2种修复树生成方案在各自适合的网络中均有较好性能:在帮助节点数较小时,Fat-tree和CamCube中的修复通信量分别降低了大约50%和30%.  相似文献   

8.
An accurate mapping of Internet traffic to applications can be important for a broad range of network management and measurement tasks, including traffic engineering, service differentiation, performance/failure monitoring and security. Traditional mapping approaches have become increasingly inaccurate because many applications use non-default or ephemeral port numbers, use well-known port numbers associated with other applications, change application signatures or use traffic encryption. In this paper we will demonstrate that multiscale traffic analysis based on multi-order wavelet spectrum can be used as a discriminator of Internet applications traffic profiles. By performing clustering analysis over the multiscale wavelet spectrum coefficients that are inferred from the measured traffic, the proposed methodology is able to efficiently differentiate different IP applications without using any payload information. This characteristic will allow the differentiation of traffic flows in unencrypted and encrypted scenarios. In order to compare the differentiating potential of different traffic application data, upload, download and joint upload and download flow statistics are considered to evaluate the identification approach for each selected protocol. Moreover, we also evaluate which timescales and spectrum orders are more relevant for the traffic differentiation. From the analysis of the obtained results we can conclude that the proposed methodology is able to achieve good identification results using a small set of timescales of a single order wavelet spectrum of a general raw traffic statistic.  相似文献   

9.
秦红祥  杨飞 《电讯技术》2013,53(7):835-839
在通信网络的设计中,使用基于流量预测的网络规划已成为LTE发展的必然趋势。与地面网络不同,卫星网络由于受资源受限和拓扑时变的不利影响,其流量预测算法必须能兼顾精度和效率,这令传统的地面网络预测方法已不再适用。为了解决以上问题,提出了一种新的基于小波回声状态网络的流量预测算法,该算法通过小波多尺度分解的信号处理方法屏蔽了网络流量的噪声,而后结合了无反馈的回声状态网络联合进行预测。仿真证明,新算法相比传统算法能大幅提升网络流量的预测精度和运行效率,为卫星网络的流量规划提供了强有力的决策支持。  相似文献   

10.
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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