[Tinyos-devel] CTP and LPL on tmote

[Omprakash Gnawali]

On Wed, Nov 26, 2008 at 9:41 AM, Philip Levis <pal at cs.stanford.edu> wrote:
>
> On Nov 26, 2008, at 8:00 AM, Andreas Köpke wrote:
>
>> Philip Levis wrote:
>>> On Nov 25, 2008, at 12:41 PM, Andreas Köpke wrote:
>>>> Hi, has anyone ever got CTP to run with LPL on  a tmote sky at a
>>>> duty cycle
>>>> smaller than 10%? In our tests with 5% the ETX values are way above
>>>> any
>>>> reasonable value.
>>>
>>> net2 is actively working on this now.
>>>
>>> Phil
>>
>> Are there any theories why there is a problem? Anything we could
>> test/do to
>> help in the process?
>
> Very good question. Unfortunately, it's the day before Thanksgiving,
> so responsiveness from Americans is kinda low until Monday. Let's
> talk about it then?
>
> To give a bit of background, in developing CTP we sketched our
> performance goal timeline like this:
>
> 1) Accurate ETX estimation and minimizing data path (data packets/
> delivery) cost
> 2) Minimizing control traffic
> 3) Integrating and testing with LPL
>
> Right now we are on 3. Part of the trick with 3 is that it depends on
> the LPL implementation. It works very well with the CC1100 and CC2500
> implementations (the ones David Moss supports most actively). We're
> just now collecting experimental traces with the CC2420 one.
>

I have heard that Roman Lim's changes to LPL makes CTP work well with it.

- om_p