NADA: A Unified Congestion Control Scheme for Real-Time Media
draft-ietf-rmcat-nada-13

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Last updated 2019-09-09 (latest revision 2019-09-06)
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Network Working Group                                             X. Zhu
Internet-Draft                                                    R. Pan
Intended status: Experimental                                 M. Ramalho
Expires: March 8, 2020                                           S. Mena
                                                           Cisco Systems
                                                       September 5, 2019

     NADA: A Unified Congestion Control Scheme for Real-Time Media
                        draft-ietf-rmcat-nada-13

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

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on March 8, 2020.

Copyright Notice

   Copyright (c) 2019 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

Zhu, et al.               Expires March 8, 2020                 [Page 1]
Internet-Draft                    NADA                    September 2019

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
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   described in the Simplified BSD License.

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 . . . . . . . . . . . . . . . . .   8
     4.3.  Sender-Side Algorithm . . . . . . . . . . . . . . . . . .  10
   5.  Practical Implementation of NADA  . . . . . . . . . . . . . .  13
     5.1.  Receiver-Side Operation . . . . . . . . . . . . . . . . .  13
       5.1.1.  Estimation of one-way delay and queuing delay . . . .  13
       5.1.2.  Estimation of packet loss/marking ratio . . . . . . .  13
       5.1.3.  Estimation of receiving rate  . . . . . . . . . . . .  14
     5.2.  Sender-Side Operation . . . . . . . . . . . . . . . . . .  14
       5.2.1.  Rate shaping buffer . . . . . . . . . . . . . . . . .  15
       5.2.2.  Adjusting video target rate and sending rate  . . . .  16
     5.3.  Feedback Message Requirements . . . . . . . . . . . . . .  16
   6.  Discussions and Further Investigations  . . . . . . . . . . .  17
     6.1.  Choice of delay metrics . . . . . . . . . . . . . . . . .  17
     6.2.  Method for delay, loss, and marking ratio estimation  . .  18
     6.3.  Impact of parameter values  . . . . . . . . . . . . . . .  18
     6.4.  Sender-based vs. receiver-based calculation . . . . . . .  20
     6.5.  Incremental deployment  . . . . . . . . . . . . . . . . .  20
   7.  Reference Implementations . . . . . . . . . . . . . . . . . .  20
   8.  Suggested Experiments . . . . . . . . . . . . . . . . . . . .  21
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  22
   11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  22
   12. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  22
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  23
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  23
     13.2.  Informative References . . . . . . . . . . . . . . . . .  24
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