基于RTT的自适应拥塞控制研究

Research on Adaptive Congestion Control Based on RTT

从实验和理论两方面对 Internet上 UDP业务的来回时间进行深入研究 ,在此基础上针对实时视频通信 ,提出一种 RTT驱动的拥塞控制算法 .和基于丢包率的拥塞控制机制相比 ,此算法在控制的实时性、网络状态的振荡抑制等方面均有明显的改善 ,更适合于实时业务的通信应用 .另外 ,文中就如何选取控制算法中 4个参数的优化值给出了分析和讨论 .

There are no congestion control mechanisms in the continuous media stream communications in which UDP is used. This results in the network congested easily and affects the quality of traffic communications. In this paper, from aspects of experiments and theories the round trip time(RTT) of UDP traffic on the Internet is researched profoundly. On the basis of these, a congestion control algorithm which is driven by RTT is proposed for real time video communication. Compared with loss rate based congestion control mechanisms, using this algorithm, the real time of control and oscillation constraint of network state etc are improved apparently. So, this algorithm is more fittable to the applications of real time communication traffics. In addition, as regard to how to select the optimum parameter values adopted in the control algorithm, analysis and discussion is presented in brief.