拥塞控制的

• In the second part of this paper , it makes a detailed analysis among fluid - model - based , smith - principle - based and two - pd - controllers - based by comparing to the method and application of control theory . then it gets the laws to keep the control loop stable . in order to analyze the dynamic and transient characters , three congestion control algorithms mentioned above have been carried out in the nist atm network simulator and the successful outcomes are brought out
  本论文对atm网络abr业务拥塞控制的控制理论算法进行了总结，简要分析了其优点和缺点；运用控制理论的分析方法和观点对基于流体控制模型、史密斯预估控制模型和双重比例微分控制模型三种拥塞控制算法加以具体的分析，从而分析了怎样确保控制环的稳定性；在nistatm网络仿真软件中嵌入以上三种拥塞控制算法，从而对算法的动态和瞬态特性进行仿真分析，以此证明控制算法的有效性；最后提出了今后atm网络abr业务拥塞控制算法的发展趋势。
• We discuss structure of the end - to - end congestion control schemes with active queue management ( aqm ) in ip network from the control theoretic point of view . and propose a fuzzy logic based aqm which can improve the robustness of the control algorithms . give out the detailed simulations
  本文从拥塞控制的角度出发，强调路由器队列管理在系统控制中的地位，并从闭环控制的角度出发，描述拥塞控制的结构，研究主动队列的控制系统模型，设计了一种用于主动队列管理( aqm )的模糊控制器，仿真证明了这种aqm算法的有效性。
• Thereafter , the article is utilized on the basis of congested mstfp that based on the congested control of tfrc , with the buffer control we put forward design plan of adaptive technique , and finish the demonstration of the adaptive technique through the test datum that acquired from the scheme that is built up in the lab
  其后，文章利用基于tfrc拥塞控制的mstfp (流媒体tcp兼容协议)和缓冲管理提出了流媒体网络传输自适应技术的设计方案及实现，并通过在实验室架构网络测试方案，获得数据完成对自适应技术的论证。
• Also the paper presents and discusses the drawbacks of heuristic designing combining with special simulation experiments used by most of network algorithms . subsequently , a new approach to design and evaluate congestion control algorithm is presented based on control theory , and several interesting directions for future research are provided . the prevail model of congestion control research is that firstly propose a scheme based on experience and intuition , and then verify and improve it through simulations and experiments , and main attention is paid on the functions of the end systems
  本文还讨论了实时多媒体业务传输的特点，总结了设计tcp友好协议的要求和目标，提出了初步设计思想；重点分析了主动队列管理这一热点领域中已有策略和算法的优缺点，并在此基础上，归纳和阐述了大多数算法所采用的启发式设计加仿真试验验证的模式存在的不足；提出了应用控制理论中的分析和设计方法研究网络拥塞控制的思路，并给出几个有意义的研究方向。
• In this paper , chapter 1 gives a general introduction to multicast congestion control . first the background and the cause of multicast congestion are introduced , and then the necessity of implementing multicast congestion control is analyzed . we also discuss the research work related to multicast congestion control
  本文首先概要介绍了组播拥塞产生的背景、原因以及实施拥塞控制的必要性，探讨了组播拥塞控制技术的研究与发展现状，并分析了当前拥塞控制中存在的主要问题。
• First the background and the cause of network congestion are introduced , and then the necessity of implementing congestion control is analyzed . we also discuss the research and development of congestion control strategies , and classify them from different aspects . finally existing problems in current congestion control are proposed
  本文首先概要介绍了internet中的拥塞现象产生的背景、原因以及实施拥塞控制的必要性，探讨了拥塞控制策略的研究与发展现状，从不同角度对拥塞控制机制进行了分类，并分析了当前拥塞控制中存在的问题。
• The main contents and contributions are list below : ( 1 ) analysis of the qos guarantee system in the network and the different congestion control mechanisms ; focus on tcp end - to - end congestion control and the mechanisms implemented in ip routers ; compare the difference between mechanisms
  本文主要作了以下研究工作： 1 )研究了目前qos研究体系，分析网络产生拥塞的根本原因与不同拥塞控制策略tcp拥塞控制与ip拥塞控制的运用。并对两者进行了对比分析，指出各自的特点。
• In fact , it will be more effective for detecting and preventing congestion if the routers peilbini congestion control strategies , so ip congestion control strategies has been discussed widely in recent years . the ietf has proposed the solution by deploying active queue management in internet routers . in this paper , chapter one gives a general introduction to the network congestion control
  由于在路由器中引入相应的拥塞控制机制，使网络本身参与资源的控制工作可以更有效地实现对拥塞的监测和预防，因此近几年ip拥塞控制策略成为当前网络研究的一个热点， ietf建议在internet路由器上采用主动队列管理机制作为ip层参与拥塞控制的手段，随机提前检测( red )算法是ietf推荐的一种主动队列管理算法。
• The main contents and contributions are listed below : ( 1 ) analysis of the qos guarantee system in the ip network , which includes the protocols , standards and polices . ( 2 ) discuss the structure of the end - to - end congestion control schemes with active queue management ( aqm ) in ip network from the control - theoretic point of view . give out a method to estimate the maximum drop probability of red ( pmax ) in view of tcp sources " maximum window limit
  主要研究内容和创新点包括： ( 1 )研究了ip网络中提供qos保证的协议和体制； ( 2 )描述拥塞控制的结构，研究主动队列管理的控制系统模型，给出一种窗口受限情况下red算法的最大丢包率的调节方法，设计了一种用于主动队列管理的模糊控制器，仿真证明了这些队列管理算法的有效性； ( 3 )研究组播qos路由的网络模型和qos约束条件；分析组播路由问题和算法；分析internet中现有主流的组播路由协议的不足之处及其对qos的支持。
• Although the congestion control research of host - ends has made great strides , the current queue management mechanism in router is not able to provide end - to - end congestion control mechanism to sustain the above environment , namely , the unfairness of assigned bandwidth or drop - rate for different types of flows and the synchronization of all tcp flows in network . so it is necessary to improve the classical queue management mecnanism such as drop _ tail and red in order to boost the qos ( quality of service ) . this article analyzes the main traits of host - ends congestion control and all kinds of fashionable queue management machanism , which include queue mechanism with absolute priority , weighted fair queue mechanism and class - based queue mechanism
  本文分析了主机端的拥塞控制机制和网络中路由器的现有各种队列管理机制：绝对优先级队列机制、加权公平队列( weightedfairqueue ) [ 1 ]机制、基于类的队列( class - basedqueue ) [ 2 ]机制以及red ( randomearlydetection ) [ 3 ]机制的主要特点，并重点针对ietf ( internetengineeringtaskforce )推荐的把red算法与明确的拥塞通告ecn ( explicitcongestionnotification ) [ 4 ]结合的方法进行了分析，发现随着internet流量的日益递增， red机制的依赖平均队列长度来管理拥塞控制的算法并不能有效地阻止包丢失：与drop - tail相比， red确实消除了对阵发流量( tcp )的偏见，但是增加了平滑流量( udp )的丢包概率。