改进TCP拥塞控制机制的设计与实现

现有的基于TCP拥塞控制算法中存在慢启动增长过快,且当前拥塞控制算法没有良好的TCP流的友好性,导致无法有效的满足网络服务质量的问题。本文采用一种改进TCP拥塞控制算法来降低其慢启动的过程,来实现有效的拥塞控制。改进TCP拥塞控制算法采用在慢启动阶段增加一个比例调整因子,缓解慢启动增长的速度,以解决慢启动增长过快的问题。本文采用了NS2网络模拟器来对上述研究进行了模拟,经模拟表明,改进TCP在丢包率、平滑性、链路利用率方面均有改善。

At present in all the methods of TCP congestion control there exists the increasing of slow start, and now all the methods of TCP congestion control have no good interface, all which result in the bad quality of Intemet service, The paper uses the developed method of TCP congestion control which can reduce the process of slow start. So it can realize the TCP congestion control effectively. The developed method of TCP congestion control uses a ratio adaptable factor in the process of slow start, It can slow down the speed of the increasing of slow start. Finally it can resolve the problem of the increasing of slow start.. NS2 Intemet simulator is used to simulate the research in the paper. It proved that the rate of lost package, the rate of smooth property and the rate of using of link has improved greatly.