I have i doubt in the next text of that paper: "For example, instead of modeling latency,by modeling the network itself TOSSIM simulates contention and backoff, which are causes of latency.".
Um, they're common terms in describing network behavior. Instead of giving a terse and incomplete answer, I'd recommend that you take a look at an introductory networking textbook. Chances are that the paper will make a lot more sense after you do so.
Phil
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"We shall not cease from exploration And the end of all our exploring Will be to arrive where we started And know the place for the first time."
- T. S. Eliot, 'Little Gidding'
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