18.5 Alternative backoff rules ⋆ ⋆ ⋆
Suppose there are two stations in a CSMA network attempting totransmit a data frame. The two stations start at stage 1 with somecontention window size w1, and each station chooses a time slot,within the contention window, uniformly at random. If the chosentime slots collide, then the stations proceed to stage 2 with anupdated contention window size w2, and so on. Transmissioncompletes at some stage i, if during this stage the two stationschoose different time slots. We are interested in the expectednumber of time slots elapsed before transmission completion. Thisexpected number is a measure of
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