Based on the constraints on new transport protocol and requirements of data transmission of teleoperation systems , we first present a novel congestion control algorithm 首先，根据开发新协议的约束要求及遥操作系统对数据传输的要求，提出了一种三项式拥塞控制机制。
The experimental results show that the mechanism can achieve the tcp - friendly behavior and the smooth variation of video quality while the network bandwidth varies 实验结果表明该拥塞控制机制能够实现一定的tcp友好性，并且能够保证视频质量随着网络带宽的波动而平稳地变化。
Due to its function to penalize non - tcp - friendly flows , red - bc can stimulate the emplyment of end - to - end congestion control mechanisms , and alleviate the severity of danger of congestion collapse 由于对非tcp友好流施加惩罚， red - bc能促进端到端拥塞控制机制的推广，降低网络拥塞崩溃的危险。
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 revealed 然后，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分类，并分析了当前拥塞控制中存在的问题。
Although congestion control is required by all applications to ensure network safety , different applications have various constraints in speed , quality and consistency of data delivery 尽管所有的组播应用都要求通过拥塞控制机制来保证网络的安全性，但是不同的应用在数据传输的速度，质量和一致性上有不同的要求。
( 2 ) modeling the network from the control - theoretic point of view , then the emphasis of research in the congestion control turns into research the control algorithms and their preferences 主要研究对象为tcp拥塞控制机制。为此网络拥塞控制的研究重点就变成研究控制算法和控制参数，对此控制理论可以在该领域发挥作用。
There were many researches focusing on point - to - point congestion control based on tcp . studies of congestion control in multicast are still in experiment phase . hardly is there any congestion avoidance control used in most multicast applications 目前，对基于tcp协议点对点传输模式中的拥塞控制研究较多，而组播中的拥塞控制的研究还处于实验研究阶段，大多数基于组播的应用还没有一种合适的拥塞控制机制或完全没有采用拥塞控制。
In chapter two we focus on tcp end - to - end congestion control strategies and the mechanisms implemented in ip routers . first the four kernel algorithms of tcp congestion control are described , and the improved schemes such as new - reno , sack and tcp - vegas are discussed either 首先对tcp基于滑动窗口的拥塞控制机制的四个核心算法：慢启动、拥塞避免、快速重传和快速恢复进行了详细阐述，讨论了当前的各种tcp拥塞控制改进方案，如newreno 、 sack 、 tcp - vegas等。
But with the fast growth of unresponsive flows , such as multimedia flows , these two assumptions cannot come into existence for unresponsive flow does n ' t adopt congestion control mechanisms , and therefore they will not back off the transmission rate when packet dropped 本文针对目前互联网在拥塞控制机制和服务质量方面存在的一些不足分别进行了研究。目前互联网的拥塞控制主要是依靠基于源端的tcp拥塞控制机制，互联网的发展也说明了tcp拥塞控制机制是成功的。
Video applications typically have delay and loss requirements , which cannot be adequately supported by the current internet . a dominant portion of today ' s internet traffic is tcp - based . therefore , designing a tcp - friendly congestion control mechamnism suitable for transporting mpeg - 4 video becomes important 目前的internet还不能有效满足视频传输应用的带宽、时延、丢包要求，且当前internet上的主要流量是基于tcp协议的，因此研究既适合于mpeg - 4视频流式传输，又能够与tcp公平分享带宽的拥塞控制机制，成为了internet传输领域的一个重要课题。
