Shared Bottleneck Detection for Coupled Congestion Control for RTP Media.
draft-ietf-rmcat-sbd-06

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Last updated 2017-04-05 (latest revision 2017-02-15)
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RTP Media Congestion Avoidance Techniques                  D. Hayes, Ed.
Internet-Draft                                                 S. Ferlin
Intended status: Experimental                 Simula Research Laboratory
Expires: August 19, 2017                                        M. Welzl
                                                               K. Hiorth
                                                      University of Oslo
                                                       February 15, 2017

   Shared Bottleneck Detection for Coupled Congestion Control for RTP
                                 Media.
                        draft-ietf-rmcat-sbd-06

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 based on continuous measurements and used as
   input to a grouping algorithm that runs wherever the knowledge is
   needed.  This mechanism complements the coupled congestion control
   mechanism in draft-ietf-rmcat-coupled-cc.

Status of This Memo

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Copyright Notice

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   This document is subject to BCP 78 and the IETF Trust's Legal
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Hayes, et al.            Expires August 19, 2017                [Page 1]
Internet-Draft         SBD for CCC with RTP Media          February 2017

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

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  The basic mechanism . . . . . . . . . . . . . . . . . . .   3
     1.2.  The signals . . . . . . . . . . . . . . . . . . . . . . .   3
       1.2.1.  Packet loss . . . . . . . . . . . . . . . . . . . . .   3
       1.2.2.  Packet delay  . . . . . . . . . . . . . . . . . . . .   3
       1.2.3.  Path lag  . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.1.  Parameters and their effect . . . . . . . . . . . . . . .   7
     2.2.  Recommended parameter values  . . . . . . . . . . . . . .   8
   3.  Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     3.1.  SBD feedback requirements . . . . . . . . . . . . . . . .   9
       3.1.1.  Feedback when all the logic is placed at the sender .   9
       3.1.2.  Feedback when the statistics are calculated at the
               receiver and SBD performed at the sender  . . . . . .  10
       3.1.3.  Feedback when bottlenecks can be determined at both
               senders and receivers . . . . . . . . . . . . . . . .  10
     3.2.  Key metrics and their calculation . . . . . . . . . . . .  11
       3.2.1.  Mean delay  . . . . . . . . . . . . . . . . . . . . .  11
       3.2.2.  Skewness estimate . . . . . . . . . . . . . . . . . .  11
       3.2.3.  Variability estimate  . . . . . . . . . . . . . . . .  12
       3.2.4.  Oscillation estimate  . . . . . . . . . . . . . . . .  12
       3.2.5.  Packet loss . . . . . . . . . . . . . . . . . . . . .  13
     3.3.  Flow Grouping . . . . . . . . . . . . . . . . . . . . . .  13
       3.3.1.  Flow grouping algorithm . . . . . . . . . . . . . . .  13
       3.3.2.  Using the flow group signal . . . . . . . . . . . . .  15
   4.  Enhancements to the basic SBD algorithm . . . . . . . . . . .  15
     4.1.  Reducing lag and improving responsiveness . . . . . . . .  15
       4.1.1.  Improving the response of the skewness estimate . . .  16
       4.1.2.  Improving the response of the variability estimate  .  18
     4.2.  Removing oscillation noise  . . . . . . . . . . . . . . .  18
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