.
Delphine,
probably you will not see significant difference in energy
consumption when you shorten the payload. As far as I am concerned, for
default, the applications in TinyOS use BMAC protocol with a large preamble.
Then, if you reduce payload length from 29 bytes to 1 byte, maybe you will be
able to see a reduction in energy consumption no more than 5%.
David Culler, Philip Levis, and all TinyOS community pardon me if I
am writing a wrong information !
In other words, could somebody confirm my informations ?
*****************
João Giacomin
Prof-DCC-UFLA
*****************
---------- Original Message -----------
From: "Zainul M Charbiwala" <[email protected]>
To: "delphine christin" <[email protected]>
Cc: [email protected]
Sent: Thu, 11 Dec 2008 14:51:53 -0800
Subject: Re: [Tinyos-help] Payload length influence on energy consumption and
padding
> Hi Delphine,
>
> Avrora tries to emulate the behavior of the chips as much as possible.
> A Mica2 radio is byte based and I know of no routine in Avrora that
> adds padding bytes. I believe the padding comes from TinyOS's packet
> management. Try changing the value of TOSH_DATA_LENGTH in
> tos/types/message.h to see the effect on padding.
>
> Zainul.
>
> On Thu, Dec 11, 2008 at 1:02 PM, delphine christin
> <[email protected]> wrote:
> > Hello,
> >
> >
> > I would like to show that the payload length influences the radio energy
> > consumption. For example, a 4 byte payload requires less power to be sent
> > than a 28 byte payload. In order to show it, I use the following scenario:
> >
> > -Boot.booted: get the data to send and switch the radio on
> > -start.done: send the data
> > -send.done: stop the radio
> > -stop.done: start a timer
> > -timer.fired: start the radio
> >
> > I have already tested this scenario with Avrora and AEON. But
unfortunately,
> > the radio energy is constant for amount of data between 1 and 10 bytes and
> > then jumps to another value between 10 and 29 bytes.
> > I have checked the packet with the -monitors=packets option and observe
> > padding.
> >
> > (1) Is this padding specific to this simulator? or to TinyOS ? or both?
> >
> > (2) Has Power Tossim the same behavior concerning padding?
> >
> > (3) I foresee to use breakpoints and the energy given by the data sheets to
> > obtain the consumption from the CPU and the radio. Do you have any advices
> > or better ideas?
> >
> > Thanks a lot in advance,
> >
> > Best regards
> >
> > DelphineC
> >
> > ________________________________
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> >
>
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