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
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