Subject: RE: [rohc] question about rohc tcp profile

From: "Kristofer Sandlund \(LU/EAB\)" <[email-masked]>
Date: Fri, 1 Dec 2006 08:43:32 +0100

Hi,

just adding some more information to what Mark has already said.

If you're implementing ROHC-TCP, my most important advice would be:

a) If you are starting from scratch: Immediately shred and delete all copies
of RFC3095 that you have lying around to confusing framework with profiles.
Implement the framework from the ROHC framework draft (see below)
b) If you already have a RFC3095 implementation: Immediately shred and 
delete all copies of RFC3095 that you have lying around to avoid confusing 
framework with profiles. Re-use the framework implementation as-is.

So in either case, reading RFC3095 will only cause you grief (it already 
has since you're asking about R-mode). ROHC-TCP does not have any _normative_ 
reference to RFC3095 so there is no reason to read that one when implementing 
the ROHC-TCP profile. 

The only documents you need to read are ROHC-TCP, ROHC-FN and ROHC Framework:
http://www.ietf.org/internet-drafts/draft-ietf-rohc-rfc3095bis-framework-04.txt
http://tools.ietf.org/wg/rohc/draft-ietf-rohc-formal-notation/draft-ietf-rohc-formal-notation-12.txt
http://tools.ietf.org/wg/rohc/draft-ietf-rohc-tcp/draft-ietf-rohc-tcp-14.txt

Regarding uni/bi-directional operation of the ROHC-TCP profile, the logic is 
quite clearly stated in sections 4.2.2, 5.2.1, 5.2.1.2 and 5.3.2 of the tcp-14 
draft, so you should read those.

BR,
   Kristofer

ben ata ibtissem <mailto:[email-masked]> wrote on den 30 november 2006 14:29 :

> hello,
> I implement the profile rohc tcp of rohc ,but i have
> one probleme, in fact for rohc to transit from one
> mode to an other i.e for example from unidirectionnel
> mode to o mode or R mode, it use the feedbacks and
> especially the field mode in witch the decompressor
> indicate what mode he wish to use , but for the
> feedbacks of tcp this field(mode field ) don't exist
> so  it can't transit from one mode to an other , to my
> opinion since the tcp is usally bidirectionnel and all
> is acquitted so the profile rohc tcp we allways be in
> the R mode
> the question is:is it, my opinion, true or not, and if
> it is true , we wil have an other problem in fact rohc
> always start in the Unidirectionnel mode so how can i
> do i.e can i initialise the mode directly in  the R
> mode or i can't?
> thank you
> 
> 
> 
> 
> 
> 
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