Self-Clocked Rate Adaptation for Multimedia
draft-ietf-rmcat-scream-cc-11

Document Type Active Internet-Draft (rmcat WG)
Last updated 2017-10-13 (latest revision 2017-10-09)
Stream IETF
Intended RFC status Experimental
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Stream WG state Submitted to IESG for Publication (wg milestones: Dec 2014 - Adopt first congesti..., Jul 2017 - Submit first congest... )
Document shepherd Martin Stiemerling
Shepherd write-up Show (last changed 2017-10-11)
IESG IESG state In Last Call (ends 2017-10-23)
Consensus Boilerplate Unknown
Telechat date On agenda of 2017-10-26 IESG telechat
Responsible AD Mirja K├╝hlewind
Send notices to "Martin Stiemerling" <mls.ietf@gmail.com>
IANA IANA review state IANA OK - No Actions Needed
IANA action state None
RMCAT WG                                                    I. Johansson
Internet-Draft                                                 Z. Sarker
Intended status: Experimental                                Ericsson AB
Expires: April 12, 2018                                  October 9, 2017

              Self-Clocked Rate Adaptation for Multimedia
                     draft-ietf-rmcat-scream-cc-11

Abstract

   This memo describes a rate adaptation algorithm for conversational
   media services such as video.  The solution conforms to the packet
   conservation principle and uses a hybrid loss and delay based
   congestion control algorithm.  The algorithm is evaluated over both
   simulated Internet bottleneck scenarios as well as in a Long Term
   Evolution (LTE) system simulator and is shown to achieve both low
   latency and high video throughput in these scenarios.

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 April 12, 2018.

Copyright Notice

   Copyright (c) 2017 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
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   include Simplified BSD License text as described in Section 4.e of

Johansson & Sarker       Expires April 12, 2018                 [Page 1]
Internet-Draft                   SCReAM                     October 2017

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Wireless (LTE) access properties  . . . . . . . . . . . .   3
     1.2.  Why is it a self-clocked algorithm? . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview of SCReAM Algorithm  . . . . . . . . . . . . . . . .   4
     3.1.  Network Congestion Control  . . . . . . . . . . . . . . .   7
     3.2.  Sender Transmission Control . . . . . . . . . . . . . . .   8
     3.3.  Media Rate Control  . . . . . . . . . . . . . . . . . . .   8
   4.  Detailed Description of SCReAM  . . . . . . . . . . . . . . .   9
     4.1.  SCReAM Sender . . . . . . . . . . . . . . . . . . . . . .   9
       4.1.1.  Constants and Parameter values  . . . . . . . . . . .   9
         4.1.1.1.  Constants . . . . . . . . . . . . . . . . . . . .   9
         4.1.1.2.  State variables . . . . . . . . . . . . . . . . .  11
       4.1.2.  Network congestion control  . . . . . . . . . . . . .  13
         4.1.2.1.  Reaction to packets loss and ECN  . . . . . . . .  15
         4.1.2.2.  Congestion window update  . . . . . . . . . . . .  16
         4.1.2.3.  Competing flows compensation  . . . . . . . . . .  18
         4.1.2.4.  Lost packet detection . . . . . . . . . . . . . .  20
         4.1.2.5.  Send window calculation . . . . . . . . . . . . .  20
         4.1.2.6.  Packet pacing . . . . . . . . . . . . . . . . . .  21
         4.1.2.7.  Resuming fast increase  . . . . . . . . . . . . .  22
         4.1.2.8.  Stream prioritization . . . . . . . . . . . . . .  22
       4.1.3.  Media rate control  . . . . . . . . . . . . . . . . .  22
     4.2.  SCReAM Receiver . . . . . . . . . . . . . . . . . . . . .  25
       4.2.1.  Requirements on feedback elements . . . . . . . . . .  25
       4.2.2.  Requirements on feedback intensity  . . . . . . . . .  27
   5.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .  28
   6.  Implementation status . . . . . . . . . . . . . . . . . . . .  29
     6.1.  OpenWebRTC  . . . . . . . . . . . . . . . . . . . . . . .  29
     6.2.  A C++ Implementation of SCReAM  . . . . . . . . . . . . .  30
   7.  Suggested experiments . . . . . . . . . . . . . . . . . . . .  30
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  31
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  31
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