AW: [802.21] IS Higher Layer Transport Requirements: update on conf call on December 8
- To: "Yoshihiro Ohba" <yohba@TARI.TOSHIBA.COM>, <STDSfirstname.lastname@example.org>
- Subject: AW: [802.21] IS Higher Layer Transport Requirements: update on conf call on December 8
- From: "Kalyan Koora" <email@example.com>
- Date: Fri, 9 Dec 2005 09:21:11 +0100
- Importance: normal
- Priority: normal
- Sender: firstname.lastname@example.org
- Thread-Index: AcX8AAnzDwMlNjOlT9GgmnprIadoyQAlhN1A
- Thread-Topic: [802.21] IS Higher Layer Transport Requirements: update on conf call on December 8
the option defined in .16 gives some flexibilty at the cost of complexity. If you ask me,
I too favour the option of fixing the length field to 2 bytes. :-)
PS: "Flexibilty is inversly proportional to the Complexity".
Von: Yoshihiro Ohba [mailto:yohba@TARI.TOSHIBA.COM]
Gesendet: Donnerstag, 8. Dezember 2005 14:59
Betreff: Re: [802.21] IS Higher Layer Transport Requirements: update on conf call on December 8
On Thu, Dec 08, 2005 at 02:46:53PM +0100, Kalyan Koora wrote:
> Hi Yoshihiro,
> thank you for your reply. Yes, I mean that what you said. As far as I
> understood the .16, they defined default size of lenght filed to be 1
> Byte where the MSB is 0 if the length of the payload is less than 127.
> If it is greater than that then the MSB is 1 and the 1st byte of the
> length field indicates, how many bytes are following the present
> length field.
> => Result: The size of length field is by default 1 Byte and only on
> need, it is extended further. Well if we think of using TLV format for
> all services (IS, CS, ES) then it is in most cases valid that the
> "Value" filed, i.e. payload of the IE is (statistically
> seen) less than 127 Byte.
This actually that the length of the Length field is variable as ASN.1 encoding does. I this this will make TLV implementation complicated. It is simpler to make it a constant length, say 2-octet.
> Hope I put it in correct words.
> -----Urspr£¿ngliche Nachricht-----
> Von: Yoshihiro Ohba [mailto:yohba@TARI.TOSHIBA.COM]
> Gesendet: Donnerstag, 8. Dezember 2005 14:34
> An: STDSemail@example.com
> Betreff: Re: [802.21] IS Higher Layer Transport Requirements: update on conf call on December 8
> On Thu, Dec 08, 2005 at 04:07:33AM -0800, Gupta, Vivek G wrote:
> > > - Do you mean with Length = variable, that the size of this field
> > > can
> > be
> > > extended depending on the information sent (like in .16)?
> > [Vivek G Gupta]
> > Yes
> I think that Kalyan's question is as to whether the length of the
> Length field is variable. The length of the Length field should be
> constant. So the answer should be *No*.
> > > I find, having a Length field of 2 Bytes is, in most cases, more
> > than
> > > enough.
> > > i.e., 1 Byte can server the purpose in most of the cases.
> > >
> > [Vivek G Gupta]
> > 1 byte is definitely inadequate. We can go with 2.
> Yes, we can go with 2.
> Yoshihiro Ohba
> > >
> > > With best regards,
> > > Kalyan
> > >
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