Subject: [manet] RE: [rohc] ROHC - IP Broadcast

From: "Ray O'Connell" <[email-masked]>
Date: Mon, 19 Dec 2005 15:16:42 -0500

Gorry,

Thanks for your expression of interest in this area.  It seems as if the
specification of an ROHC profile for the point-to-multipoint case is one
that can be relevant to multiple IP working group efforts.  I can see an
immediate need for this technology in the wireless routing and sensor
networking applications.  I have also received interest in the broadcast
of control traffic, and voice/multimedia multicast traffic in
point-to-multipoint wireless ad hoc networks.  

Within the IETF the 6lowpan group is addressing the issue though the
solution seems to me to be a little too specific to the 802.15.4
specification for general usage.  The OLSR protocol in the MANET working
group is addressing compression of IPv6 addresses within the link state
protocol packets though a general solution does not exist for the
compression of IP headers in MANET transmission of period hellos and
routing control traffic at this time as far as I can see. 

It seems that one of the main points to be addressed is the
specification of how a compressor could received feedback from more than
one de-compressor as well has handle the case of nodes joining/leaving
an existing compression stream.

I agree that the writing of a problem statement would be the first step.
It could make sense to have multiple team members identify each of their
areas and how the compression scheme could be applied.  These could then
be reviewed to determine if there is enough cohesion between them to
work towards a common draft.  Based on the success of this effort we
could then preset the results at the next IETF meeting in March.

If anyone is interested in joining this process or can see another
application for the point-to-multipoint compression case please let us
know.

Ray

Ray O'Connell
Nova Systems Solutions
A Division of Nova Engineering, Inc.
9928 Windisch Rd
West Chester, OH 45069
Voice: 513-483-6305
Fax:    513-554-3898
[email-masked]

-----Original Message-----
From: Gorry Fairhurst [mailto:[email-masked]] 
Sent: Monday, December 19, 2005 12:05 PM
To: Lars-Erik Jonsson (LU/EAB)
Cc: Ray O'Connell; [email-masked]
Subject: Re: [rohc] ROHC - IP Broadcast

Ray,

This topic has been mentioned several times in the ipdvb WG, but no 
draft have ever been
 presented on this topic! If you have ideas of requirements, 
expectations or mapping to
the existing mechanisms, I'm sure there are some in the ipdvb WG who 
would also be
interested in helping define such topics at least for broadcast (e.g. 
satellite/cable/TV) links. 

I suspect that once the problem-statement is written, there would be an 
opportunity to see
what needs to be done, who is willing to contribute energy,  and what 
part the ROHC WG
would be able to play :-)

Best wishes,

Gorry
(ipdvb WG Chair)
http://www.ietf.org/html.charters/ipdvb-charter.html

Lars-Erik Jonsson (LU/EAB) wrote:

>Ray, 
>
>  
>
>>Is the current thinking one or more of the following:
>>
>>1)      The U-mode and current UDP/IP profiles all ready
>>        cover the broadcast case sufficiently.
>>2)      This is an issue though it just has not been a
>>        priority at this point.
>>3)      No interest in addressing this in the ROHC working group.  
>>4)      Other ?
>>    
>>
>
>As always, IETF work is never started before someone asks for it
>to be done, justifies the need for it, gets support from others,
>makes sure there are volunteers to do the work, and find
>(sometimes creates) a proper IETF working group where it fits.
>
>In this case, we have not yet seen any case presented that
>there is ROHC work needed for this purpose. From a ROHC WG
>point of view, one can thus say that this is (so far) a
>non-existing issue. My personal assumption (at the moment)
>would be that either there is no interest in running ROHC over
>broadcasting links, or implementer's have found 1) to be fine.
>
>If you do believe otherwise, you are welcome to introduce the
>problem case to the ROHC working group (in Internet-Draft form).
>
>BR,
>/L-E
>
>_______________________________________________
>Rohc mailing list
>[email-masked]
>https://www1.ietf.org/mailman/listinfo/rohc
>
>
>
>  
>

"This email contains confidential and/or privileged material.  This email and any files transmitted with it are confidential and intended solely for the person or entity to whom they are addressed.  Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited.  If you have received this email in error, please contact the sender and delete the material from any computer."

_______________________________________________
manet mailing list
[email-masked]
https://www1.ietf.org/mailman/listinfo/manet