NADA: A Unified Congestion Control Scheme for Real-Time Media
draft-ietf-rmcat-nada-04

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Last updated 2017-04-05 (latest revision 2017-03-27)
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Network Working Group                                             X. Zhu
Internet-Draft                                                    R. Pan
Intended status: Experimental                                 M. Ramalho
Expires: September 28, 2017                                      S. Mena
                                                                P. Jones
                                                                   J. Fu
                                                           Cisco Systems
                                                             S. D'Aronco
                                                                    EPFL
                                                          March 27, 2017

     NADA: A Unified Congestion Control Scheme for Real-Time Media
                        draft-ietf-rmcat-nada-04

Abstract

   This document describes NADA (network-assisted dynamic adaptation), a
   novel congestion control scheme for interactive real-time media
   applications, such as video conferencing.  In the proposed scheme,
   the sender regulates its sending rate based on either implicit or
   explicit congestion signaling, in a unified approach.  The scheme can
   benefit from explicit congestion notification (ECN) markings from
   network nodes.  It also maintains consistent sender behavior in the
   absence of such markings, by reacting to queuing delays and packet
   losses instead.

Status of This Memo

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   This Internet-Draft will expire on September 28, 2017.

Zhu, et al.            Expires September 28, 2017               [Page 1]
Internet-Draft                    NADA                        March 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  System Overview . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Core Congestion Control Algorithm . . . . . . . . . . . . . .   5
     4.1.  Mathematical Notations  . . . . . . . . . . . . . . . . .   5
     4.2.  Receiver-Side Algorithm . . . . . . . . . . . . . . . . .   7
     4.3.  Sender-Side Algorithm . . . . . . . . . . . . . . . . . .   9
   5.  Practical Implementation of NADA  . . . . . . . . . . . . . .  12
     5.1.  Receiver-Side Operation . . . . . . . . . . . . . . . . .  12
       5.1.1.  Estimation of one-way delay and queuing delay . . . .  12
       5.1.2.  Estimation of packet loss/marking ratio . . . . . . .  12
       5.1.3.  Estimation of receiving rate  . . . . . . . . . . . .  13
     5.2.  Sender-Side Operation . . . . . . . . . . . . . . . . . .  13
       5.2.1.  Rate shaping buffer . . . . . . . . . . . . . . . . .  14
       5.2.2.  Adjusting video target rate and sending rate  . . . .  15
     5.3.  Feedback Message Requirements . . . . . . . . . . . . . .  15
   6.  Discussions and Further Investigations  . . . . . . . . . . .  16
     6.1.  Choice of delay metrics . . . . . . . . . . . . . . . . .  16
     6.2.  Method for delay, loss, and marking ratio estimation  . .  16
     6.3.  Impact of parameter values  . . . . . . . . . . . . . . .  17
     6.4.  Sender-based vs. receiver-based calculation . . . . . . .  18
     6.5.  Incremental deployment  . . . . . . . . . . . . . . . . .  18
   7.  Implementation Status . . . . . . . . . . . . . . . . . . . .  18
   8.  Suggested Experiments . . . . . . . . . . . . . . . . . . . .  19
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  19
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