RED-BASED HOP-BY-HOP CONGESTION CONTROL

The frequent occurrence of congestion in the current Internet has led many researchers to re-examine the issue of congestion control. A novel RED-based hop-by-hop congestion control mechanism is presented in this paper, in which the outgoing flow is dynamically adjusted at the node, using feedback information provided by its downstream node. The feedback information is sent when a node detects incipient congestion early using an enhanced RED algorithm. The mechanism is implemented in a testbed and its performance is compared with that of an equivalent end-to-end control mechanism by simulation. The simulation results show that the hop-by-hop mechanism eliminates packet drops, improves the total throughput, and decreases jitter compared with the end-to-end control under the same conditions.