[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Evaluation: draft-ietf-avt-crtp-enhance - Enhanced Compressed RTP (CRTP) for links with high delay, packet loss and reordering to Proposed Standard
- To: Internet Engineering Steering Group <iesg@ietf.org>
- Subject: Evaluation: draft-ietf-avt-crtp-enhance - Enhanced Compressed RTP (CRTP) for links with high delay, packet loss and reordering to Proposed Standard
- From: IESG Secretary <iesg-secretary@ietf.org>
- Date: Fri, 28 Mar 2003 17:45:42 -0500
Last Call to expire on: 2003-3-19
Please return the full line with your position.
Yes No-Objection Discuss * Abstain
Harald Alvestrand [ ] [ ] [ ] [ ]
Randy Bush [ ] [ ] [ ] [ ]
Bill Fenner [ ] [ ] [ ] [ ]
Ned Freed [ ] [ ] [ ] [ ]
Ted Hardie [ ] [ ] [ ] [ ]
Russ Housley [ ] [ ] [ ] [ ]
Allison Mankin [ X ] [ ] [ ] [ ]
Thomas Narten [ ] [ ] [ ] [ ]
Erik Nordmark [ ] [ ] [ ] [ ]
Jon Peterson [ ] [ ] [ ] [ ]
Bert Wijnen [ ] [ ] [ ] [ ]
Alex Zinin [ ] [ ] [ ] [ ]
2/3 (9) Yes or No-Objection opinions needed to pass.
* Indicate reason if 'Discuss'.
^L
To: IETF-Announce:;
Dcc: *******
Cc: RFC Editor <rfc-editor@isi.edu>,
Internet Architecture Board <iab@iab.org>, avt@ietf.org
From: The IESG <iesg-secretary@ietf.org>
Subject: Protocol Action: Enhanced Compressed RTP (CRTP) for links with
high delay, packet loss and reordering to Proposed Standard
-------------
The IESG has approved the Internet-Draft 'Enhanced Compressed RTP
(CRTP) for Links with High Delay, Packet Loss and Reordering'
<draft-ietf-avt-crtp-enhance-07.txt> as a Proposed Standard. This
document is the product of the Audio Video Transport Working Group.
The IESG contact persons are Allison Mankin and Jon Peterson.
Technical Summary
This document describes a header compression scheme for point to point
links with packet loss and long delays. It is based on Compressed
Real-time Transport Protocol (CRTP), the IP/UDP/RTP header compression
described in RFC 2508. Original CRTP does not perform well on such
links: packet loss results in context corruption and due to the long
delay, excessive packets are discarded before the context is
repaired. To correct the behavior of CRTP over such links, a few
extensions to the protocol are specified here. The extensions aim to
reduce context corruption by changing the way the compressor updates
the context at the decompressor: updates are repeated and include
updates to full and differential context parameters. With these
extensions, ECRTP performs well over links with packet loss, packet
reordering and long delays.
The distinction is made that ECRTP is robust for links with reordering
such as tunnels and multihop, and it is also robust for cellular links
with high loss but that ROHC (RFC 3095) is expected "to be the preferred
compression mechanism over links where compression efficiency is important"
and packet misordering is infrequent.
Working Group Summary
The working group supported advancement of this document. There were
no Last Call concerns with the document, but Area Director comments
resulted in clarifications on IPv6, Security considerations, and applicability.
Protocol Quality/Review
This document was reviewed for the IESG by Allison Mankin.
The Transport Area seeks information about implementations of ECRTP and
their performance.