On Mon, 7 Aug 2006, Philip Levis wrote:
> On Aug 5, 2006, at 4:30 AM, [EMAIL PROTECTED] wrote:
>
> >
> > Dear friends,
> >
> > The paper entitled "EVALUATING THE USE OF MOTES AND TINYOS
> > FOR A MOBILE SENSOR PLATFORM"
> > evaluates 802.15.4 (beaconmode) on a real sensor network of micaz
> > and telos motes.
> > Suprisingly, it says beacon mode can not be supported on
> > capabilities that present motes posses. Any comments on the paper
> > will be very useful.......
> >
> > please google for the paper as attachment mails are bouncing back!!!!
>
> I'm not sure if I understand all of the conclusions made in the
> paper; among other things, Jonathan Hui and Joe Polastre implemented
> 802.15.4 beaconing mode as part of the implementation of SP.
>
> For example, in section 5.1 you state that 15.4 requires a periodic
> 20 symbol timer, and that this makes it impossible to implement
> properly. I don't think your statement is correct. It requires a
> timer with a fidelity of 1 symbol, but there's nothing there that
> means that you need to fire a timer every 20 symbols... why would you
> need to do so? You're picking a random number in the range of random
> (2^(BE-1)) unit periods...
>
> Phil
>
Yes you are correct. The author (not me) considers the fact of picking a
random number in the range of random (2^(BE-1)) unit periods in the section 5.2.
And accordingly sets the timer interrupt rate.
Intresting fact is in 5.3. The author quotes it is not possible to
statisfy the ACK (slotted ACK) timing requirements as lower levels of
TinyOS takes more time.
I will try to see Jonathan Hui's code to get how slotted ACKs being
handled in his implementation.
Thanking you,
Manjunath
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