This paper addresses the problem of configuring active queue management systems (e.g. WRED and RIO) for service level specifications in Internetworks. In particular, we focus on Assured Forwarding (AF) for non-responsive flows in Differentiated Services networks. The difficulty is to determine the correct queue level thresholds that will result in correct drop rates for various AF precedence le...

Choosing the correct values for the parameters of an Active Queue Management (AQM) scheme is a well-known hard problem. The Adaptive Virtual Queue (AVQ) attempts at solving this problem by using stability requirements to devise a rule for setting its parameter. This memo shows that the AVQ rule for setting its parameter is impractical for many real-life situations.

This paper studies how to design a stabilizing AQM in supporting TCP (Transmission Control Protocol) with arbitrary delays. For the well-known AIMD (Additive Increase Multiplicative Decrease) dynamic model of TCP, our study shows that we can compensate for arbitrary delays explicitly by applying a modified virtual queue dynamics that makes the equilibrium queuing delay zero. This study also ver...

This document describes service classes configured with Diffserv and recommends how they can be used and how to construct them using Differentiated Services Code Points (DSCPs), traffic conditioners, Per-Hop Behaviors (PHBs), and Active Queue Management (AQM) mechanisms. There is no intrinsic requirement that particular DSCPs, traffic conditioners, PHBs, and AQM be used for a certain service cl...

あらまし 近年、エンド–エンド間で動作する TCPの輻輳制御機構を補助し、ルータにおいて積極的に輻輳制御を行 う、アクティブキュー管理機構が注目を浴びている。アクティブキュー管理機構には制御パラメータが存在するが、そ の有効性はこれらの制御パラメータの設定に依存する。そのため、アクティブキュー管理機構の制御パラメータ設定 方法に関しては、これまでさまざまな研究が行われてきた。しかし、そのほとんどは、少数のシミュレーション結果か ら、制御パラメータがアクティブキュー管理機構の性能に与える影響を調べているにすぎない。そこで本稿では、多 変量解析手法を用いることにより、膨大な数のシミュレーション結果を統計的に解析し、アクティブキュー管理機構の 制御パラメータが、その性能にどのような影響を与えるかを定量的に明らかにする。本稿では、代表的なアクティブ キュー管理機構である RED (Rando...

Active Queue Management (AQM) policies are mechanisms for congestion avoidance, which pro-actively drop packets in order to provide an early congestion notification to the sources. In this paper we propose a new Adaptive Prediction based Approach for Congestion Estimation in Active Queue Management (APACE) that predicts the instantaneous queue length at a future time using adaptive filtering te...