共查询到20条相似文献,搜索用时 93 毫秒
1.
本文对ATM网络中的带宽分配及接入控制方案进行归纳,提出一种新的基于带宽分配的接入方案,同时用计算机模拟出原有接入算法中各参数之间的函数关系。 相似文献
2.
ATM网络中综合连接接纳控制与路由选择的模糊决策策略 总被引:2,自引:0,他引:2
本文提出了一种新的模糊决策策略,用于综合考虑连续接纳控制和路由选择,以求在ATM网络中增加整个网络的吞吐量和降低信元丢失率与呼损率。文章中详细阐述了该模糊决策系统的原理,并给出了一种自适应调节系统参数的方法。仿真结果说明利用神经网络能够成功地实现此模糊系统。 相似文献
3.
4.
5.
6.
提出了通用信元速率算法(GCRA)中的时延变化容限问题及用法/网络参数控制(UPC/NPC)中的检测相位问题,并讨论了这两个问题的解决方法。 相似文献
7.
ATM网络提供了两种途径来实现LAN互连:直接途径和间接途径。相比之下,直接法以其能连接更多的LAN和利用ATM网络的统计复用能力而更有吸引力。针对直接接情形,这里提出了一种结合流控制和动态带 业务管理策略,并用实验对它进行了性能分析,从而证实了这一策略能带来带宽的增益,并能同时减少网网络性能对无连接业务特性的敏感性。 相似文献
8.
9.
使用参数控制(UPC)是ATM网络流量控制的一个重要手段。文章从对UPC的要求出发,分析了几种UPC监测机制,并给出它们的实现方法。另外 UPC机制对违 约信元采取的向种警管措施,指出了它们的优缺点,并在此基础上提出了一种新的警管想法。 相似文献
10.
11.
本文主要分析在宽带综合业务数字网(B-ISDN)中,以ATM为传递方式的业务控制机制,主要从控制机制所应具备的特点及控制功能的划分角度进行讨论,并对控制机制中的业务监测和业务描述器两个主要问题进行了深入地分析。 相似文献
12.
Erwin P. Rathgeb 《International Journal of Communication Systems》1993,6(4):213-226
ATM has been accepted by CCITT as the transport mechanism for the future BISDN and will also be widely used in future customer premises networks. Networks based on the ATM principle are expected to provide a very flexible communications infrastructure allowing customers to make effective use of a wide variety of offered services. To provide this flexibility with an acceptable quality of service while operating the network in an economic way, elaborate traffic management functions will be necessary to control the traffic flows within the network. This paper will study one of these functions—the so-called ‘usage parameter control’ or ‘policing’ function—in some detail to illustrate some of the problems that arise and point out possible solutions. The mechanisms chosen to implement the policing function will be the ‘leaky bucket’ mechanism, the ‘jumping window’ mechanism and the ‘moving window’ mechanism. The input streams used to assess the mechanisms represent different types of video communication—videophone, video conference and entertainment video—coded according to different variable bit-rate (VBR) algorithms. In contrast to most of the previous studies, where artificial, statistical traffic sources have been used, the sources used in this paper are directly based on measured ‘real-life’ video data. This ensures that all the statistical properties of the actual traffic stream are preserved and allows identification of the different factors that influence the dimensioning and the performance of the policing mechanism. The results of this study show that the uncertainty about the key parameters at call set-up and the considerable impact of single scenes make the proper dimensioning of policing mechanisms difficult. Furthermore, it seems not to be practical to use the long term mean bit-rate as the key traffic control parameter for these sources. Results indicating that the long-term cell loss ratio is not a sufficient measure for the quality of service are also presented. A comparison of the mechanisms shows that from a performance perspective, the ‘leaky bucket’ mechanism is superior to the two window mechanisms. This work is relevant to evolving standards for both BISDN traffic management and variable bit-rate video coding. 相似文献
13.
文章介绍了一种适合于混合业务类型、非均匀业务流两步长VP动态带宽管理策略,分析了带宽管理策略的带宽利用率、连接阻塞概率和带宽分配处理负载,对其进行了计算机模拟仿真,并与固定步长动态带宽管理策略进行了分析比较。 相似文献
14.
模糊漏桶在ATM网络UPC中的应用 总被引:3,自引:2,他引:3
本文提出了模糊漏桶模型,研究了它与普通漏桶在用户量参数控制(UPC)中的作用。由于CAC初步协议的不完全合理性,在实际应用中动态调节是必要的;仿真结果表明在降低信元丢失率、时延和时延抖动方面,及在动态利用网络资源方面,模糊漏桶算法要比普通的优越。我们还给出了合适的模糊控制规则。 相似文献
15.
首先扼要地讨论了光纤通信领域在新世纪面临的严重任务 ,接着详细地介绍了神经网络的基本概念 ,重点论述了神经网络在 ATM光纤高速智能管理网中的应用。最后指出 ,神经网络应用于通信领域可以实现快捷、灵活、自适应性和智能化实时管理 ,在某些方面可以解决即使数学计算机也会感到棘手的难题。 相似文献
16.
本文介绍了ATM(异步转移模式)在公共网络中的作用,ATM在公共网络中的发展方向,最后着重讨论了公共ATM网络的要求。 相似文献
17.
Contributed by Alcatel China Limited 《世界电信》1997,10(1):28-30
ATM技术在未来宽带网中将扮演十分重要的角色。本文介绍了阿尔卡特公司的ATM交换机,接入系统和相关网管系统,对其主要产品的性能和组成进行发较详细的说明,最后简单列举了几个在世界上应用的实例。 相似文献
18.
19.
Zervas Evangelos Kaloxylos Alexandros Merakos Lazaros 《Mobile Networks and Applications》2001,6(2):125-135
In this paper we present a new location management protocol for wireless ATM networks, called LMCP (Location Management and Control Protocol). This protocol is based on the PNNI (Private Network-to-Network Interface) routing functionality to advertise the movement of mobile terminals within predefined areas. Moreover, LMCP uses specialized entities to store and retrieve the current location area of the mobile terminals. These entities are located in mobility enhanced switches that control the execution of mobility procedures (e.g., handovers).The main benefit from the application of LMCP is the establishment of connections that do not contain any misrouted segments. Furthermore, it requires minor modifications to the PNNI and enables its inter-working with other location management mechanisms. The protocol is compared with other similar mechanisms, and its efficiency is demonstrated by the results of an analytical model. 相似文献
20.
论述了有关资源预留对比走入业务,开环控制对比反馈控制,基于速率控制对比基于窗口控制以及基于路由器控制对比基于信源控制等几个关于高速网中拥塞控制和拥塞避免方法的争论双方的论点。 相似文献