在研究TFRC协议的基础上,将延迟抖动作为网络拥塞的预警信号,对TFRC协议拥塞避免阶段的速率控制算法进行了改进,并将改进后的TFRC协议运用到网络视频传输速率控制中,以实现视频自适应传输.通过基于EvalVid工具集的NS-2仿真实验证明了基于TFRC协议的视频自适应传输机制能够有效地提高视频传输QoS.%Based on the study of TFRC, this paper improved the congestion avoidance algorithm of TFRC by using delay jitter as the congestion warning signal, and used the improved TFRC in the rate control mechanism of the network video transmission to achieve the purpose of adaptive-tranmission. The NS- 2 simulation experiments based on EvailVid tool-sets show that the mechanism can significantly improve QoS of the video transmission.
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