Shared Bottleneck Detection for Coupled Congestion Control for RTP Media.
draft-ietf-rmcat-sbd-01

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RTP Media Congestion Avoidance                             D. Hayes, Ed.
Techniques                                            University of Oslo
Internet-Draft                                                 S. Ferlin
Intended status: Experimental                 Simula Research Laboratory
Expires: January 2, 2016                                        M. Welzl
                                                      University of Oslo
                                                            July 1, 2015

   Shared Bottleneck Detection for Coupled Congestion Control for RTP
                                 Media.
                        draft-ietf-rmcat-sbd-01

Abstract

   This document describes a mechanism to detect whether end-to-end data
   flows share a common bottleneck.  It relies on summary statistics
   that are calculated by a data receiver based on continuous
   measurements and regularly fed to a grouping algorithm that runs
   wherever the knowledge is needed.  This mechanism complements the
   coupled congestion control mechanism in draft-welzl-rmcat-coupled-cc.

Status of this Memo

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   Copyright (c) 2015 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Hayes, et al.            Expires January 2, 2016                [Page 1]
Internet-Draft         SBD for CCC with RTP Media              July 2015

   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  The signals  . . . . . . . . . . . . . . . . . . . . . . .  3
       1.1.1.  Packet Loss  . . . . . . . . . . . . . . . . . . . . .  3
       1.1.2.  Packet Delay . . . . . . . . . . . . . . . . . . . . .  3
       1.1.3.  Path Lag . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Parameters and their Effect  . . . . . . . . . . . . . . .  5
     2.2.  Recommended Parameter Values . . . . . . . . . . . . . . .  7
   3.  Mechanism  . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     3.1.  Key metrics and their calculation  . . . . . . . . . . . .  9
       3.1.1.  Mean delay . . . . . . . . . . . . . . . . . . . . . .  9
       3.1.2.  Skewness Estimate  . . . . . . . . . . . . . . . . . .  9
       3.1.3.  Variability Estimate . . . . . . . . . . . . . . . . . 10
       3.1.4.  Oscillation Estimate . . . . . . . . . . . . . . . . . 11
       3.1.5.  Packet loss  . . . . . . . . . . . . . . . . . . . . . 11
     3.2.  Flow Grouping  . . . . . . . . . . . . . . . . . . . . . . 12
       3.2.1.  Flow Grouping Algorithm  . . . . . . . . . . . . . . . 12
       3.2.2.  Using the flow group signal  . . . . . . . . . . . . . 13
     3.3.  Removing Noise from the Estimates  . . . . . . . . . . . . 13
       3.3.1.  PDV noise  . . . . . . . . . . . . . . . . . . . . . . 14
       3.3.2.  Oscillation noise  . . . . . . . . . . . . . . . . . . 14
       3.3.3.  Clock skew . . . . . . . . . . . . . . . . . . . . . . 15
     3.4.  Reducing lag and Improving Responsiveness  . . . . . . . . 15
       3.4.1.  Improving the response of the skewness estimate  . . . 16
       3.4.2.  Improving the response of the variability estimate . . 16
   4.  Measuring OWD  . . . . . . . . . . . . . . . . . . . . . . . . 17
     4.1.  Time stamp resolution  . . . . . . . . . . . . . . . . . . 17
   5.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 17
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 17
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 17
   8.  Change history . . . . . . . . . . . . . . . . . . . . . . . . 18
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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