视频会议系统中的实际数据流量具有与传统的短相关模型差别显著的长相关性 ,这使得需要更新以往的流量控制算法以适应新兴的视频通信的要求。为此 ,在局域网上运行的视频会议系统的速率控制方面 ,提出了对源端的发送速率进行双时间标度控制的算法。它采用 QOS(业务质量 )分层的思想 ,在小时间标度上 ,根据接收方的反馈信息 ,选择一定层次质量的数据进行发送 ;在大时间标度上 ,控制相邻层次变换的难易程度 ,以减小层次间的振荡 ,使接收方得到稳定质量的图像。实验表明 ,该算法可以适应网络情况 ,为系统提供尽可能好的并且稳定的业务质量 The actual data traffic in video conferencing systems has significant long-term correlation with the traditional short-correlation model, which makes it necessary to update the previous traffic control algorithms to meet the requirements of emerging video communications. Therefore, in the aspect of rate control of the video conference system running on the LAN, an algorithm of dual-time scale control on the sending rate of the source is proposed. It adopts the idea of ​​QOS (Quality of Service) layering, selects the data of a certain level quality according to the feedback information of the receiver on the small time scale, and controls the difficulty of the adjacent layer transformation on the large time scale Level to reduce the level of oscillation, the receiver to get a stable quality of the image. Experiments show that this algorithm can adapt to the network situation and provide the best possible and stable quality of service to the system