A non-equilibrium analysis and control framework for active queue management
Automatica (Journal of IFAC)
| Hi-index | 0.00 |
Active Queue Management (AQM) is intended to achievehigh link utilization with a low queuing delay. Recent studiesshow that RED, one of the most well-known AQMs, isdifficult to configure and does not provide significant performancegains given the complexity required for proper configuration.Recent variants of RED, such as Adaptive-REDare designed to provide more robust RED performance undera wider-range of traffic conditions but have not yet beenevaluated. This paper presents a router queue behaviormodel (a queue law) for TCP-dropping and TCP-markingcontrol systems, and uses the queue law to illustrate the impactof TCP traffic on the load and queue behavior of congestedrouters. Through queue law analysis and simulation,this paper confirms that RED-like AQM techniques that employpacket dropping do not significantly improve performanceover that of drop-tail queue management. However,when AQM techniques use Explicit Congestion Notification(ECN) as a method to notify TCP sources of congestionrather than packet drops, the performance gains of AQMin terms of goodput and delay can be significant over thatof drop-tail queue management.