[Tinyos-devel] from longer CTP/LQI experiments

[Omprakash Gnawali]

I did several experiments yesterday - most of them longer runs than
the ones I have been doing the last few weeks. And one interesting
case - lqi30: LQI with maximum retransmission of 30. The question is,
if we let lqi retransmit as many times as ctp, what will lqi
performance look like? The answer seems to be still not good enough
and much worse than ctp.

Here are the graphs:
http://enl.usc.edu/~om_p/net2/ctp4bitle/figures.html

First I did four runs back to back, each run 4050 seconds: lqi30,
lqi5, a8, and a9. Based on these four experiments, lqi30 delivers more
pkts than lqi5 but at a much higher expense so a8 and a9 are looking
good.

Then I did two long runs - a9 for more than nine hrs (labeled aa9) and
lqi5 for about 2.5 hrs (labeled lqi5b). Looking at the high thl graph,
I don't see it settling down permanently. It settles down for a bit
and starts climbing again. But maybe this is because the threshold of
10 is too low for a pkt to classify as a high thl - 10 should be
enough!  The trend is more clear in the high goodcost distribution
graph. Again you can look at THL(t) and goodcost(t) to try to make
sense.

- om_p