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RE: Couple of comments on 21-05-0671-00-0000-802.21-FrameFormat.doc



> -----Original Message-----
> From: stds-802-21@ieee.org [mailto:stds-802-21@ieee.org] On Behalf Of
> Kalyan Koora
> Sent: Monday, June 26, 2006 2:12 AM
> To: STDS-802-21@listserv.ieee.org
> Subject: Couple of comments on 21-05-0671-00-0000-802.21-FrameFormat.doc
> 
> Hi all,
> 
> here are my comments on the document
> 21-05-0671-00-0000-802.21-FrameFormat.doc:
> 
> - I agree with Ulises that the length encoding is not clearly defined
>   over there. To explain it also an example proposal has already been
>   submitted by us too:
[Vivek G Gupta] 
Ad hoc group agreed with this.


> 
> http://www.ieee802.org/21/doctree/2006-05_meeting_docs/21-06-0607-00-000
> 0-len-enc-eg.ppt
> 
> - From ulises document, section 2.2:
>   "....The length of the Value field (in octets) is then 128 plus the
> number represented by
>    the other appended Length field octets starting from the second. ..."
> 
>   The present length encoding is taken (as far as I can remember) from the
> "definite form"
>   of ITU-T X.690 and is also used in 802.16. I advice to be standard
> confirm as defined in
>   ITU.
> 
[Vivek G Gupta] 
What was presented by Ulises was a more generalized form of this.


> - My two cents to the MIHF header definition from this doc:
>   As far as I can remember, the reason to take Session ID and MIHF-ID into
> variable
>   part is: there are cases where we don't need them:
>    * initial communication doesn't need session ID but MIHF ID
>    * once communication 'pairing' is done, then there is no need of MIHF
> ID
>      but session ID.
>   So, if we keep them fixed in header, then we are having some overhead.
> This might also
>   be valid for transaction ID. But the discussions have shown that in most
> cases
>   transaction ID enables faster and efficient communication. Thus, it has
> been finally
>   decided to take into fixed header.
> 
[Vivek G Gupta] 
The Ad hoc group came to similar conclusions.

> Regards,
> Kalyan
> 
> --
> 
> 
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