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The Performance Improvement using Rate Control in End-to-End Network Systems  

Kim, Gwang-Jun (여수대학교 컴퓨터공학과)
Yoon, Chan-Ho (조선대학교 컴퓨터공학과)
Kim, Chun-Suk (여수대학교 전자통신공학과)
Publication Information
Journal of the Korea Institute of Information and Communication Engineering / v.9, no.1, 2005 , pp. 45-57 More about this Journal
Abstract
In this paper, we extend the performance of bidirectional TCP connection over end-to-end network that uses transfer rate-based flow and congestion control. The sharing of a common buffer by TCP packets and acknowledgement has been known to result in an effect called ack compression, where acks of a connection arrive at the source bunched together, resulting in unfairness and degraded throughput. The degradation in throughput due to bidirectional traffic can be significant. Even in the simple case of symmetrical connections with adequate window size, the connection efficiency is improved about 20% for three levels of background traffic 2.5Mbps, 5.0Mbps and 7.5Mbps. Otherwise, the throughput of jitter is reduced about 50% because round trip delay time is smaller between source node and destination node. Also, we show that throughput curve is improved with connection rate algorithm which is proposed for TCP congetion avoidance as a function of aggressiveness threshold for three levels of background traffic 2.5Mbps, 5Mbps and 7.5Mbps. By analyzing the periodic bursty behavior of the source IP queue, we derive estimated for the maximum queue size and arrive at a simple predictor for the degraded throughput, applicable for relatively general situations.
Keywords
Transfer rate-based Congestion Control; Ack Compression; Throughput Rate; Connection Efficiency;
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