On Oct 26, 2006, at 3:27 AM, Pela wrote:
Using the "simple" model means that all the nodes will receive packets
and the bit error rate is set to zero. However, collisions can still
occur as well as the hidden terminal problem, for this reason crc
errors
are possible. As far as I know, collisions cannot be disabled in
tossim.
Correct: TOSSIM is intended to be a (somewhat accurate) environment
for testing real TinyOS code, not an abstract packet simulator. One
issue that comes up if you do not have packet collisions is node have
effectively infinite receive bandwidth.
TOSSIM's design is a reaction to a lot of the ns2 simulations of the
90s. Experience showed that the conclusions reached with simplified
wireless network models were completely useless in practice. It
forces you to deal with the basic challenges of wireless immediately,
rather than pushing them to "future work" which never happens; my
experience is that protocols designed with simplifying assumptions
rarely deal well with the relaxation of those assumptions.
Phil
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