Shared Bottleneck Detection for Coupled Congestion Control for RTP Media
RFC 8382

Document Type RFC - Experimental (June 2018; No errata)
Last updated 2018-06-25
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Internet Engineering Task Force (IETF)                     D. Hayes, Ed.
Request for Comments: 8382                                     S. Ferlin
Category: Experimental                        Simula Research Laboratory
ISSN: 2070-1721                                                 M. Welzl
                                                               K. Hiorth
                                                      University of Oslo
                                                               June 2018

Shared Bottleneck Detection for Coupled Congestion Control for RTP Media

Abstract

   This document describes a mechanism to detect whether end-to-end data
   flows share a common bottleneck.  This mechanism 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.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This document is a product of the Internet Engineering
   Task Force (IETF).  It represents the consensus of the IETF
   community.  It has received public review and has been approved for
   publication by the Internet Engineering Steering Group (IESG).  Not
   all documents approved by the IESG are candidates for any level of
   Internet Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8382.

Hayes, et al.                 Experimental                      [Page 1]
RFC 8382                SBD for CCC for RTP Media              June 2018

Copyright Notice

   Copyright (c) 2018 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Hayes, et al.                 Experimental                      [Page 2]
RFC 8382                SBD for CCC for RTP Media              June 2018

Table of Contents

   1. Introduction ....................................................4
      1.1. The Basic Mechanism ........................................4
      1.2. The Signals ................................................4
           1.2.1. Packet Loss .........................................4
           1.2.2. Packet Delay ........................................5
           1.2.3. Path Lag ............................................5
   2. Definitions .....................................................6
      2.1. Parameters and Their Effects ...............................7
      2.2. Recommended Parameter Values ...............................8
   3. Mechanism .......................................................9
      3.1. SBD Feedback Requirements .................................10
           3.1.1. Feedback When All the Logic Is Placed at
                  the Sender .........................................10
           3.1.2. Feedback When the Statistics Are Calculated at the
                  Receiver and SBD Is Performed at the Sender ........11
           3.1.3. Feedback When Bottlenecks Can Be Determined
                  at Both Senders and Receivers ......................11
      3.2. Key Metrics and Their Calculation .........................12
           3.2.1. Mean Delay .........................................12
           3.2.2. Skewness Estimate ..................................12
           3.2.3. Variability Estimate ...............................13
           3.2.4. Oscillation Estimate ...............................13
           3.2.5. Packet Loss ........................................14
      3.3. Flow Grouping .............................................14
           3.3.1. Flow-Grouping Algorithm ............................14
           3.3.2. Using the Flow Group Signal ........................18
   4. Enhancements to the Basic SBD Algorithm ........................18
      4.1. Reducing Lag and Improving Responsiveness .................18
           4.1.1. Improving the Response of the Skewness Estimate ....19
           4.1.2. Improving the Response of the Variability
                  Estimate ...........................................20
      4.2. Removing Oscillation Noise ................................21
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