In a WiFi network that uses the MAC scheme CSMA/CA (method 1) four users want to send data at the times 0, 0.25, 0.75, 2.25 as shown in the figure. If DIFS = 0.5 and the random times generated following this order (1, 0.5, 0.5, 1, 0.5, 1 ) calculate the time to send the packet for each user (fill the table below) and draw the expected scenario. Clarify if any collision happens. Assume that the medium is free at time 0 and the time needed to send the packet = 0.5

User 1 User 2 User 3 User 4 0 0.5 .5 2 2.5 3 3.5 4 4.5 55.5 66.5 7 7.5 Time to send User # User 1 User 2 User 3 User 4