[Tinyos-help] shorter (cc2420/telosb) radio range in t2 compared to t1?

[Jeongyeup Paek]

To close the thread for now... my hypothesis was wrong.

I went back to
t1/CntToRfm/TOSBase, t2/BlinkToRadio/BaseStation,
on the same testbed and the range seems to be identical.

The main difference between my code and above (I think)
is capturing timestamp at sfd interrupt.
I need further investigation and experiments with my code.

Thanks to everyone for help.

Thanks

- jpaek


Philip Levis wrote:
> On Oct 30, 2007, at 10:32 AM, Jeongyeup Paek wrote:
> 
>>
>> 1 packet every 10 seconds.
> 
> OK, so this is really weird.
> 
> 2 questions:
> 
> 1) Do the same 8-12 nodes receive the 2.x packet, or are those 8-12 a 
> randomized subset of those that receive the 1.x packet. The former would 
> suggest, as you noted, an RSSI issue, while the latter might suggest a 
> state/flushing issue.
> 
> 2) Can you log the RSSI of the received packets and see if they differ 
> across 1.x and 2.x? There might be a channel power thing going on.
> 
> Another cause -- as David noted -- might be the MAC. Tutornet does have 
> really rough 802.11 interference. But I agree that this seems less 
> likely than some other causes.
> 
> Phil

-- 

Jeongyeup Paek
Ph.D. student
Embedded Networks Laboratory
Department of Computer Science
University of Southern California
http://enl.usc.edu/~jpaek