Self-Clocked Rate Adaptation for Multimedia
draft-ietf-rmcat-scream-cc-10

Document Type Active Internet-Draft (rmcat WG)
Last updated 2017-08-15 (latest revision 2017-07-18)
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... )
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RMCAT WG                                                    I. Johansson
Internet-Draft                                                 Z. Sarker
Intended status: Experimental                                Ericsson AB
Expires: January 19, 2018                                  July 18, 2017

              Self-Clocked Rate Adaptation for Multimedia
                     draft-ietf-rmcat-scream-cc-10

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
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   This Internet-Draft will expire on January 19, 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
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Johansson & Sarker      Expires January 19, 2018                [Page 1]
Internet-Draft                   SCReAM                        July 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.  Congestion window update  . . . . . . . . . . . .  16
         4.1.2.2.  Competing flows compensation  . . . . . . . . . .  18
         4.1.2.3.  Lost packet detection . . . . . . . . . . . . . .  20
         4.1.2.4.  Send window calculation . . . . . . . . . . . . .  20
         4.1.2.5.  Packet pacing . . . . . . . . . . . . . . . . . .  21
         4.1.2.6.  Resuming fast increase  . . . . . . . . . . . . .  21
       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  . . . . . . . . . . . . . . . . . . . . . . . . .  27
   6.  Implementation status . . . . . . . . . . . . . . . . . . . .  28
     6.1.  OpenWebRTC  . . . . . . . . . . . . . . . . . . . . . . .  29
     6.2.  A C++ Implementation of SCReAM  . . . . . . . . . . . . .  29
   7.  Suggested experiments . . . . . . . . . . . . . . . . . . . .  30
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  30
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  31
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  31
   11. Change history  . . . . . . . . . . . . . . . . . . . . . . .  31
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