Internet Engineering Task Force (IETF) A. Begen
Request for Comments: 6683 Cisco
Category: Informational T. Stockhammer
ISSN: 2070-1721 Nomor Research
August 2012
Guidelines for Implementing Digital Video Broadcasting - IPTV (DVB-IPTV)
Application-Layer Hybrid Forward Error Correction (FEC) Protection
Abstract
Annex E of the Digital Video Broadcasting - IPTV (DVB-IPTV) technical
specification defines an optional Application-Layer Forward Error
Correction (AL-FEC) protocol to protect the streaming media
transported using RTP. The DVB-IPTV AL-FEC protocol uses two layers
for FEC protection. The first (base) layer is based on the 1-D
interleaved parity code. The second (enhancement) layer is based on
the Raptor code. By offering a layered approach, the DVB-IPTV AL-FEC
protocol offers good protection against both bursty and random packet
losses at a cost of decent complexity. This document describes how
one can implement the DVB-IPTV AL-FEC protocol by using the 1-D
interleaved parity code and Raptor code that have already been
specified in separate documents.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6683.
Begen & Stockhammer Informational [Page 1]RFC 6683 Guidelines for DVB AL-FEC Protocol August 2012Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. DVB-IPTV AL-FEC Specification . . . . . . . . . . . . . . . . 5
2.1. Base-Layer FEC . . . . . . . . . . . . . . . . . . . . . . 5
2.2. Enhancement-Layer FEC . . . . . . . . . . . . . . . . . . 7
2.3. Hybrid Decoding Procedures . . . . . . . . . . . . . . . . 7
3. Session Description Protocol (SDP) Signaling . . . . . . . . . 8
4. Security Considerations . . . . . . . . . . . . . . . . . . . 9
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 9
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.1. Normative References . . . . . . . . . . . . . . . . . . . 10
6.2. Informative References . . . . . . . . . . . . . . . . . . 10
1. Introduction
In 2007, the IP Infrastructure (IPI) Technical Module (TM) of the
Digital Video Broadcasting (DVB) consortium published a technical
specification [ETSI-TS-102-034v1.3.1] through the European
Telecommunications Standards Institute (ETSI).
[ETSI-TS-102-034v1.3.1] covers several areas related to the
transmission of MPEG2 transport stream-based services over IP
networks.
Annex E of [ETSI-TS-102-034v1.3.1] defines an optional protocol for
Application-Layer Forward Error Correction (AL-FEC) to protect the
streaming media for DVB-IP services transported using RTP [RFC3550].
In 2009, DVB updated the specification in a new revision that is
available as [ETSI-TS-102-034v1.4.1]. Among others, some updates and
modifications to the AL-FEC protocol have been made. This document
describes how one can implement the DVB-IPTV AL-FEC protocol by using
the 1-D interleaved parity code [RFC6015] and Raptor code
specifications [RFC6681] [RFC6682].
Begen & Stockhammer Informational [Page 2]RFC 6683 Guidelines for DVB AL-FEC Protocol August 2012
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