Self-Clocked Rate Adaptation for Multimedia
draft-ietf-rmcat-scream-cc-01

The information below is for an old version of the document
Document Type Active Internet-Draft (rmcat WG)
Last updated 2015-07-06
Stream IETF
Intended RFC status (None)
Formats plain text pdf html bibtex
Stream WG state WG Document (wg milestones: Dec 2014 - Adopt first congesti..., Jul 2017 - Submit first congest... )
Document shepherd No shepherd assigned
IESG IESG state I-D Exists
Consensus Boilerplate Unknown
Telechat date
Responsible AD (None)
Send notices to (None)
RMCAT WG                                                    I. Johansson
Internet-Draft                                                 Z. Sarker
Intended status: Experimental                                Ericsson AB
Expires: January 7, 2016                                    July 6, 2015

              Self-Clocked Rate Adaptation for Multimedia
                     draft-ietf-rmcat-scream-cc-01

Abstract

   This memo describes a rate adaptation algorithm for conversational
   video services.  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 LTE (Long Term Evolution) 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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 7, 2016.

Copyright Notice

   Copyright (c) 2015 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
   (http://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

Johansson & Sarker       Expires January 7, 2016                [Page 1]
Internet-Draft                   SCReAM                        July 2015

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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Wireless (LTE) access properties  . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Overview of SCReAM Algorithm  . . . . . . . . . . . . . . . .   4
     3.1.  Congestion Control  . . . . . . . . . . . . . . . . . . .   4
     3.2.  Transmission Scheduling . . . . . . . . . . . . . . . . .   5
     3.3.  Media Rate Control  . . . . . . . . . . . . . . . . . . .   5
   4.  Detailed Description of SCReAM  . . . . . . . . . . . . . . .   5
     4.1.  SCReAM Sender . . . . . . . . . . . . . . . . . . . . . .   5
       4.1.1.  Constants and Parameter values  . . . . . . . . . . .   7
       4.1.2.  Network congestion control  . . . . . . . . . . . . .  11
         4.1.2.1.  Congestion window update  . . . . . . . . . . . .  12
         4.1.2.2.  Transmission scheduling . . . . . . . . . . . . .  16
       4.1.3.  Video rate control  . . . . . . . . . . . . . . . . .  17
     4.2.  SCReAM Receiver . . . . . . . . . . . . . . . . . . . . .  19
   5.  Feedback Message  . . . . . . . . . . . . . . . . . . . . . .  20
   6.  Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .  22
   7.  Conclusion  . . . . . . . . . . . . . . . . . . . . . . . . .  22
   8.  Open issues . . . . . . . . . . . . . . . . . . . . . . . . .  22
   9.  Implementation status . . . . . . . . . . . . . . . . . . . .  23
     9.1.  OpenWebRTC  . . . . . . . . . . . . . . . . . . . . . . .  23
     9.2.  A C++ Implementation of SCReAM  . . . . . . . . . . . . .  24
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  24
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  25
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  25
   13. Change history  . . . . . . . . . . . . . . . . . . . . . . .  25
   14. References  . . . . . . . . . . . . . . . . . . . . . . . . .  25
     14.1.  Normative References . . . . . . . . . . . . . . . . . .  25
     14.2.  Informative References . . . . . . . . . . . . . . . . .  26
   Appendix A.  Additional features  . . . . . . . . . . . . . . . .  27
     A.1.  Packet pacing . . . . . . . . . . . . . . . . . . . . . .  27
     A.2.  Stream prioritization . . . . . . . . . . . . . . . . . .  28
     A.3.  Q-bit semantics (source quench) . . . . . . . . . . . . .  30
     A.4.  Frame skipping  . . . . . . . . . . . . . . . . . . . . .  31
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  32
Show full document text