Re: [rohc] Liaison towards 3GPP

[Krister Svanbro <krister.svanbro@lu.erisoft.se>]

Alessio, 

If the IP ID is re-assigned the "wrong number" then
you can end up with troubles ...
You regard the IP ID as non-essential, which more fields
do you regards as non-essential?

Who can decide which fields that are essential
from network and application point of view?

What about UDP checksum, TOS, are these fields essential
in your view? 

I certainly understand the need of spectrum efficiency, 
but using a non-transparant header stripping scheme for
voice over "IP" is to me one step forward and then two steps 
backwards.

/ Krister

"Casati, Alessio (Alessio)" wrote:
> 
> Krister,
> 
> > Are you sure about this. If the IP ID is non-sequential as it commonly
> > is, I am pretty sure it will be stripped and reproduced without
> > preserving the original value. Hence, violation of IP integrity.
> >
> I would regard this as a non essential field, since
> it's used for idetification of a packet, useful when
> reassembilng its fragments, and it seems to me no fragments
> of an IP packet carrying a voice frame is expected at the
> other en of the wireless channel when RTP/UDP/IP header is stripped.
> 
> >From an engineering point of view, the IPv4 ID integrity
> does not matter when the header is stripped.
> 
> alessio
> ---
> Mailing list for Robust Header Compression WG
> Archive: http://www.cdt.luth.se/rohc/

-- 
 __________________________________________________________

 Krister Svanbro, M.Sc.  -  Ericsson Research 
 AWARE - Advanced Wireless Algorithm Research at Erisoft
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