中文摘要：

运输控制协议(TCP ) 广泛地在象 FTP，电子邮件和 http 那样的相连、无线的因特网应用程序被使用了。众多的拥挤回避算法被建议了在各种各样的情形改进 TCP 的表演，特别为高速度和无线网络。尽管不同算法可以在不同网络条件下面完成不同性能改进，设计能越过大量网络条件表现很好的一个拥挤算法仍然是大挑战。基于延期的 TCP 有一个潜力在挑战上面克服。然而，有 TCP Reno 的基于延期的 TCP 的不公平问题广泛地在宽区域网络上堵住基于延期的 TCP 的推广。在这份报纸，我们建议了一个新奇基于延期的拥挤控制算法，命名快适合，它能在两个极端高速度网络优雅地表现，以及与广泛地部署的 TCP Reno 使公平体面和宽区域网络招待。快适合作为主要输入使用排队延期控制 TCP 拥挤窗户。包损失被用作一个第二等的信号适应地调整主要控制过程的参数。理论分析和试验性的结果证明算法的表演显著地作为与另外的最先进的算法相比被改进，当维持好公平时。

英文摘要：

The transport control protocol （TCP） has been widely used in wired and wireless Intemet applications such as FTP, email and HTTP. Numerous congestion avoidance algorithms have been proposed to improve the performance of TCP in various scenarios, especially for high speed and wireless networks. Although different algorithms may achieve different performance improvements under different network conditions, designing a congestion algorithm that can perform well across a wide spectrum of network conditions remains a great challenge. Delay-based TCP has a potential to overcome above challenges. However, the unfairness problem of delay-based TCP with TCP Reno blocks widely the deployment of delay-based TCP over wide area networks. In this paper, we proposed a novel delay-based congestion control algorithm, named FAST-FIT, which could perform gracefully in both ultra high speed networks and wide area networks, as well as keep graceful faimess with widely deployed TCP Reno hosts. FAST-FIT uses queuing delay as a primary input for controlling TCP congestion window. Packet loss is used as a secondary signal to adaptively adjust parameters of primary control process. Theoretical analysis and experimental results show that the performance of the algorithm is significantly improved as compared to other state-of-the-art algorithms, while maintaining good faimess.