RE: [rohc] Requirements for IP/UDP/RTP header compression

[christopher.clanton@nokia.com]

Hi Mikael,

I have a few comments/questions on the draft requirements document.  Can you
elaborate?

- Does the handoff requirment intend to allow for loss due to the header
compression scheme (i.e., in addition to the normal 'break' that you have
during cellular handoff).
- The packet loss requirement was omitted; why?  Is it otherwise clear that
loss prior to the compressor should be handled efficiently?
- Why has mention of timing jitter been removed? 
- Packet Misordering requirement has been changed to say 'moderate'
reordering.  Is there a reason to attempt to quantify the amount of
misordering in this way?
- Complexity requirement has been omitted; but it seems like it should be
there, for sake of simple/cheap mobiles if nothing else.   
- Generic Applicability requirement has been omitted, but it would seem that
this requirement is directly in line with the charters intention to support
various radio technologies.
- "Compatibility with Other Schemes" requirement has also been omitted?
Why?
- Error Propagation definition has been changed to refer specifically to
error propagation due to the 'the link'; what is 'the link'?  Is it only the
compressor/decompressor link, or is it the link between the RTP source and
destination?

Chris Clanton
Nokia Research Center - Dallas
Mobile Networks Lab


-----Original Message-----
From: EXT Mikael Degermark [mailto:micke@cs.arizona.edu]
Sent: 29. March 2000 11:56 AM
To: rohc@cdt.luth.se
Cc: micke@cs.arizona.edu
Subject: [rohc] Requirements for IP/UDP/RTP header compression


Folks,

I spent the last couple of hours producing an initial version of the
requirements 
document for IP/UDP/RTP header compression. I apparently missed the i-d
deadline before 
the meeting and then when the 3G.IP contribution arrived I wanted to merge
that with 
what I had. 

Please comment. The draft is available at 


ftp://cdt.luth.se/micke/draft-ietf-rohc-rtp-requirements-00.txt

and I will submit it as soon as possible after the meeting.

Cheers, 

Mikael Degermark 

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