help3002

It's UWAweek 16 (1st semester, week 7)

help3002

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UWA week 15 (1st semester, week 6) ↓

the unit in general solution to tute 3 q2c (both)

4:08am Wed 10th Apr, Christopher M.

ANONYMOUS wrote:

> Hi, hoping I could check my solution to tutorial Q2c with someone here as I couldn't make it to the last two tutes :) > > (c) What is the probability that all 3 devices can successfully transmit their frames in a maximum of 3 time slots after the original collision?

For this to occur, each of the 3 slots must host exactly one transmission. If the 1st slot hosts a successful re-transmission by one node, the other two nodes must have chosen to not immediately retransmit, but to back-off for one slot. Then, in the 2nd slot, the two nodes that had backed-off will now *both* re-transmit => another collision! Then, in the 3rd slot, we still have two nodes wishing to re-transmit. So, it's not possible, and the probability of it happening is 0.