Loss Classification for Real-Time Streaming Services in Wired/Wireless Networks

摘要

This paper addresses the rate control problem for real-time applications streamed over wireless networks. In wired networks, an equation-based rate control such as TCP-friendly rate control (TFRC) can be used to control the rates of a source, based on the assumption that the loss isprimarily due to congestion. But in wireless networks, packet loss may be due either to congestion or to channel error. Thus, it is necessary to differentiate between packet loss due to wireless channel errors and that due to congestion. To apply this concept to real-time applications, weconsider a rate control method without retransmission for UDP traffic. For implementation of rate control, we utilize a rate control module at the application layer and use NS-2 to determine the performance of adaptive rate control. The results show that the adaptive rate control scheme hasa higher throughput than that of the rate control scheme without loss classification. Also, packet loss with adaptive rate control is approximately the same as with rate control without loss classification.