摘要： 研究了实时多媒体业务传输协议在无线－有线混合网络中所面临的新问题，在此基础上提出了一种基于TCP友好速率控制协议的新的实时业务的流控机制，利用延迟抖动率作为丢包分辨信号来调整TFRC的速率控制，以区分拥塞丢包和无线信道丢包。大量的NS仿真实验表明：该算法在无线－有线混合网络中能提高有效通过量，对于TCP流具有良好的公平性。

关键词: 无线－有线混合网络, TCP友好速率控制, 延迟抖动率, NS-2

Abstract: Real time multimedia transport protocols in wireless-wired hybrid network are facing new challenges. On the basis of extensive study of characteristics of wireless-wired hybrid network and the current TFRC mechanism, this paper proposes a new TCP-friendly rate control mechanism for real-time traffics. The new mechanism uses Jitter ratio as the signal to differentiate congestion losses and wireless link losses to adjust TFRC’s rate control algorithm. Extensive simulations on NS-2 verify that the new mechanism has better performance than TFRC as well as keeps reasonable friendliness to TCP flows.

Key words: Wireless-wired hybrid network, TCP-friendly rate control (TFRC), Jitter ratio, NS-2