Re: Subject: I-D ACTION:draft-clausen-ipdvb-enc-00.txt

[Gorry Fairhurst <gorry@erg.abdn.ac.uk>]

harri.hakulinen@nokia.com wrote:
> 
> Hello,
> 
> nice doc, in terms of information exhange.
> 
> Couple of quick comments, more may follow::
> 
> - Have you calculated, what is the actual efficiency
>   gain compared to MPE (1 or 2 % ?) ?

Well, that depends...

First, processing COST is significantly smaller 
- far fewer fields to process and decode.

Second, there is a small gain compared to the best case for MPE,
and a much larger gain compared to the worst case (small packets,
unpacked). 

Some analysis of MPE was previously sent to this list at:
http://www.erg.abdn.ac.uk/users/gorry/ip-dvb/docs/Overhead-Analysis.doc

> 
>   (I assume that in dowstream most packets are rather big)
> 
> - Related to that, is it justified to do this without taking
>   header compression into consideration from the beginning ?
> 
I beleive you are right, we SHOULD look at header compression,
you'll see that the proposed scheme seems very suited to use
with a scheme such as ROHC header compression, however the
details of this scheme are still being pursued by the ROHC WG.

I think header compression is going to be important for many
applications, - one obvious case is transmission of small
IPv6 datagrams over links with limited bandwidth.

> - Do you, by any change, know who has the IPR for the
>   "MPLS label" in adaptation field ?
> 

Not sure what you mean...

> Br,
> 
> //Harri
> 
> > -----Original Message-----
> > From: ext Gorry Fairhurst [mailto:gorry@erg.abdn.ac.uk]
> > Sent: Friday, April 19, 2002 12:31 PM
> > To: ip-dvb@erg.abdn.ac.uk
> > Subject: Subject: I-D ACTION:draft-clausen-ipdvb-enc-00.txt
> >
> >
> >
> > Dear all,
> >
> > find below the first draft for a submission for a next
> > generation encapsulation
> > for IP over DVB.  All comments / corrections are welcome, please  send
> > to the
> > authors or this list.
> >
> > Gorry Fairhurst
> >
> > -----------------
> >
> > From: Internet-Drafts@ietf.org
> > Reply-To: Internet-Drafts@ietf.org
> > Date: Thu, 18 Apr 2002 08:00:23 -0400
> > To: IETF-Announce: ;
> > Subject: I-D ACTION:draft-clausen-ipdvb-enc-00.txt
> >
> > A New Internet-Draft is available from the on-line Internet-Drafts
> > directories.
> >
> >
> >     Title        : Simple Encapsulation for transmission of
> > IP datagrams
> >                           over MPEG-2/DVB networks
> >     Author(s)    : H. Clausen et al.
> >     Filename    : draft-clausen-ipdvb-enc-00.txt
> >     Pages        : 14
> >     Date        : 17-Apr-02
> >
> > This document contains the Simple Encapsulation, a simple and lean
> > encapsulation mechanism for the transport of IP Datagrams over ISO
> > MPEG-2 Transport Streams (TS). The MPEG-2 TS has been widely
> > accepted not only for providing digital TV services, but also as a
> > subnetwork technology for building IP networks. One example is the
> > Digital Video Broadcast (DVB), specified by standards published by
> > the European Telecommunications Standards Institute (ETSI).
> >
> > A URL for this Internet-Draft is:
> > http://www.ietf.org/internet-drafts/draft-clausen-ipdvb-enc-00.txt
> >
> > To remove yourself from the IETF Announcement list, send a message to
> > ietf-announce-request with the word unsubscribe in the body
> > of the message.
> >
> > Internet-Drafts are also available by anonymous FTP. Login
> > with the username
> > "anonymous" and a password of your e-mail address. After logging in,
> > type "cd internet-drafts" and then
> >     "get draft-clausen-ipdvb-enc-00.txt".
> >
> > A list of Internet-Drafts directories can be found in
> > http://www.ietf.org/shadow.html
> > or ftp://ftp.ietf.org/ietf/1shadow-sites.txt
> >
> >
> > Internet-Drafts can also be obtained by e-mail.
> >
> > Send a message to:
> >     mailserv@ietf.org.
> > In the body type:
> >     "FILE /internet-drafts/draft-clausen-ipdvb-enc-00.txt".
> >
> > NOTE:    The mail server at ietf.org can return the document in
> >     MIME-encoded form by using the "mpack" utility.  To use this
> >     feature, insert the command "ENCODING mime" before the "FILE"
> >     command.  To decode the response(s), you will need "munpack" or
> >     a MIME-compliant mail reader.  Different MIME-compliant
> > mail readers
> >     exhibit different behavior, especially when dealing with
> >     "multipart" MIME messages (i.e. documents which have been split
> >     up into multiple messages), so check your local documentation on
> >     how to manipulate these messages.
> >
> >
> > Below is the data which will enable a MIME compliant mail reader
> > implementation to automatically retrieve the ASCII version of the
> > Internet-Draft.
> >
> >
> > ------ End of Forwarded Message
> >