WebRTC Forward Error Correction Requirements
draft-ietf-rtcweb-fec-00

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Document Type Active Internet-Draft (rtcweb WG)
Last updated 2015-03-03 (latest revision 2015-02-06)
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Network Working Group                                          J. Uberti
Internet-Draft                                                    Google
Intended status: Standards Track                        February 5, 2015
Expires: August 9, 2015

              WebRTC Forward Error Correction Requirements
                        draft-ietf-rtcweb-fec-00

Abstract

   This document makes recommendations for how Forward Error Correction
   (FEC) should be used by WebRTC applications.

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
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   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 August 9, 2015.

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
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Types of FEC  . . . . . . . . . . . . . . . . . . . . . . . .   2
     3.1.  Separate FEC Stream . . . . . . . . . . . . . . . . . . .   3
     3.2.  Redundant Encoding  . . . . . . . . . . . . . . . . . . .   3
     3.3.  Codec-Specific In-band FEC  . . . . . . . . . . . . . . .   3
   4.  FEC for Audio Content . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Recommended Mechanism . . . . . . . . . . . . . . . . . .   3
     4.2.  Negotiating Support . . . . . . . . . . . . . . . . . . .   4
   5.  FEC for Video Content . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Recommended Mechanism . . . . . . . . . . . . . . . . . .   4
     5.2.  Negotiating Support . . . . . . . . . . . . . . . . . . .   5
   6.  Implementation Requirements . . . . . . . . . . . . . . . . .   5
   7.  Adaptive Use of FEC . . . . . . . . . . . . . . . . . . . . .   5
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     11.2.  Informative References . . . . . . . . . . . . . . . . .   6
   Appendix A.  Change log . . . . . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   In situations where packet loss is high, or media quality must be
   perfect, Forward Error Correction (FEC) can be used to proactively
   recover from packet losses.  This document describes what FEC
   mechanisms should be used by WebRTC client implementations.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

3.  Types of FEC

   By its name, FEC describes the sending of redundant information in an
   outgoing packet stream so that information can still be recovered
   even in the face of packet loss.  There are multiple ways in which
   this can be accomplished; this section enumerates the various
   mechanisms and describes their tradeoffs.

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3.1.  Separate FEC Stream

   This approach, as described in [RFC5956], Section 4.3, sends FEC
   packets as an independent SSRC-multiplexed stream, with its own SSRC
   and payload type.  While by far the most flexible, each FEC packet
   will have its own IP+UDP+RTP+FEC header, leading to additional
   overhead of the FEC stream.
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