Performance Evaluation of TCP-Friendly Rate Control Enhanced with Adaptive Filters
G.-A. Lusilao Zodi, J. Nakato Kakande -, Mqhele E. Dlodlo, Gerhard De Jager, Keith L. Ferguson · International Journal of Advancements in Computing Technology · 2011
The emergence of multimedia applications has spurred interest in transport protocols with flexible transmission control. In TCP-Friendly Rate Control (TFRC), the multimedia transmission rate is adapted using the TCP throughput equation. This model, defined in terms of the relationship between throughput, round-trip time and loss rate, ensures that the resulting protocol is TCP compatible. However, standard TFRC wastes bandwidth because it is slow to detect changes in the available capacity. In this paper we take a new direction in tackling this problem. The classical TCP filter used in the estimation of the round-trip time is replaced by two filters namely the adaptive TCP filter and adaptive Kalman filter. Based on jitter, delay and throughput results, it is illustrated that the adaptive filters respond better to drastic changes in network round trip time, providing better aggressiveness and responsiveness in rate adaptation at the multimedia server. The Kalman filter provides the best performance, with the adaptive TCP filter also showing significant improvements over the classical TCP filter.