TCP Yuelu:一种基于有线/无线混合网络端到端的拥塞控制机制

无线链路传输数据的比特率出错导致TCP协议在有线／无线混合网络环境下性能低下，在改进算法TCPReno的基础上，文章提出了一种适用于有线／无线混合网络的拥塞控制机制，该机制包括一种分阶段平滑慢启动机制，改善了突发流量对网络性能的损害，引入网络测量技术获得了往返时间（RTT）、网络带宽、瓶颈链路队列长度等网络状态参数，区分网络拥塞和无线链路比特差错，避免了终端节点对网络状态不了解产生的盲目行为，有效改进了TCP的加性增加乘性减少（AIMD）窗口调节机制，提高了网络性能．同时，在仿真软件NS2中实现了该算法，进行了大量的仿真实验，实验结果表明TCP Yuelu有效降低了网络抖动，提高了网络传输性能，并保持了良好的公平性和对其它TCP流的友好性．

TCP Yuelu:An End-to-End Congestion Control Mechanism for Wired/Wireless Hybrid Networks

Since high bit-error rate caused by wireless links in wireless/wired hybrid networks greatly degrades the end-to-end performance of TCP, based on some enhanced TCP variants, this paper proposes an efficient congestion control mechanism for wireless/wired hybrid networks. This mechanism consists of a phase-divided smooth slow start algorithm which weakens harm to network performance caused by bursty traffic; It also employs network measurement technology, obtaining the network parameters, such as RTT(Round Robin Time), network bandwidth and queue length of the bottleneck link, so the terminal nodes efficiently avoid improper behavior and be free of the blindness of network states. And the AIMD(Additive Increase Multiplicative Decrease) rule of the window of TCP is modified according to network states and packet loss reasons. The network performance is greatly improved. This algorithm is implemented in the network simulator NS2 and many simulation experiments are designed with various scenarios, and simulation results show that TCP Yuelu decreases network oscillation and improves network performance, and good fairness and friendliness are achieved.