Abstract: As TCP Friendly Rate Control (TFRC) is used in the application of the Real-Time Streaming Media, the fluctuation of the sending rate is obvious. It is harmful to the transmission of the Real-Time Streaming Media. This essay employed Relaxation Algorithm to limit the variation of the sending rate of the TFRC flow adaptively. It made the sending rate of the TFRC flow more smooth and constringent. The experimental results show that Relaxation Algorithm can improve the capability of TFRC while guaranteeing the high quality of transmission of the Real-Time Streaming Media.

Key words: TCP Friendly Rate Control （TFRC）, sending rate, congestion, rate control, relaxation

摘要： 由于TCP友好速率控制（TFRC）机制在实时多媒体应用中，TFRC流的发送速率波动性明显，不利于实时多媒体流的传输。采用松弛算法对TFRC流的发送速率进行自适应约束，使TFRC流发送速率在与TCP流竞争中变得更加平缓、收敛。实验结果表明，松弛算法能够改善TFRC的性能，提高实时流媒体的传输质量。

关键词: TCP友好速率控制, 发送速率, 拥塞, 速率控制, 松弛算法