Re: [rohc] Byte-alignment

[Mikael Degermark <micke@CS.Arizona.EDU>]

I was planning to say that, yes. It seemed to be the consensus in Adelaide. 
Objections, anyone?

Micke

At 02:14 PM 4/7/00 +0200, Lars-Erik Jonsson wrote:
>Some days ago, I sent this question to the list. Since there have been no
>arguments against the opinions I raised in this issue, I would like to make a
>request to put this into the requirements document. Even if it is obvious to me
>that the scheme should be byte-aligned, I know that it is not clear to all of
>those involved in this. Therefore the requirements document must state that only
>byte-aligned solutions should be considered.
>
>Micke, will you include that in some way??
>
>BR
>/Lars-Erik
>
>
>
>
>
>>Hi all ROHC-ers!
>>
>>Discussion of technical issues on this list is of fundamental importance to get
>>results in the WG. I will therefore start with a discussion about the
>>byte-alignment issue and I hope we can clear this out easily.
>>
>>The question is whether there is any reason to design a robust header
>>compression framework that can support non-byte-aligned versions of the scheme.
>>I do not think so. All link-layers I have seen are byte-aligned and that is
>also
>>preferrable from an implementation point of view.
>>
>>This question is important because the answer gives different approaches to the
>>problem.
>>1) When designing a non-byte-aligned scheme, the objective is to make all
>fields
>>as small as possible on a bit-level.
>>2) For byte-aligned schemes the objective is instead to squeeze as much
>>information as possible into 1, 2 or several bytes. Then the smallest possible
>>header size must always be used.
>>
>>We MUST always have versions of the scheme that are designed byte-aligned. A
>>non-byte-aligned scheme may be instantiated to byte-alignment but will not make
>>use of all bits in an optimal way.
>>
>>I think it is important to clarify that (and if) we are only considering
>>byte-aligned solutions. Some mechanisms for non-byte-aligned solutions will not
>>be usable at all in a byte-aligned scheme and we could then ignore such
>>mechanisms when discussing solutions.
>>
>>Regards!
>>/Lars-Erik
>>
>>
>>--------------------------------------------------------------
>>Lars-Erik Jonsson, M.Sc. - Ericsson Research
>>AWARE - Advanced Wireless Algorithm Research at Erisoft
>>Box 920, S-971 28 Luleå, Sweden
>>E-mail: lars-erik.jonsson@ericsson.com
>>Phone: +46 920 20 21 07
>>Mobile: +46 70 554 82 71
>>Fax: +46 920 20 20 99
>>Home: +46 920 999 57
>>
>>
>>---
>>Mailing list for Robust Header Compression WG
>>Archive: http://www.cdt.luth.se/rohc/
>