TR-IIS-05-016    Fulltext


Improving End-to-End Performance of RED

Chin-Fu Ku, Ray-I Chang, Jan-Ming Ho, Sao-Jie Chen

Abstract

Congestion control mechanisms play a important role in today’s Internet, since network environments are geting more and more complicated. Besides, new applications request diverse services delivered by the network. Random Early Detection (RED) provides an efficient and low-overhead mechanism to effectively control congestion. Nevertheless, RED would slow down TCP senders’ reaction to change of network condition, in particular the bottleneck link with long propagation delay or RED with a smaller weighted factor. Thus, we proposed a better way to drop/mark packets not just based on queue occupancy. In this paper, an enhancement intending to improve the performance in terms of delay, delay jitter and packet loss ratio is proposed. The basis idea is to react quickly to major changes in network conditions so as to shorten the time it takes for a sender to gather signals, e.g., round-trip time and lost packets from networks. The simulation results show the enhancement could effectively raise the performance in terms of delay, delay jitter and packet loss ratio.