Appendix O-A · Animation
CSMA/CA: The 802.11 Birthday Problem in Motion
5
Stations
0
Received
0
Collisions
0
Attempts
0%
Utilisation
B=?
Next TX
Collision Rate
0%
P(collision)
= 1 − k!·
N
C
k
/ N
k
=
0%
(
4
slots,
4
stations)
Stations
5
Network MCS
MCS 10
Weak Link MCS
MCS 1
Weak Station
STA 1
Transmit Rate (per STA)
200 tx/s
CW
min
(CW
max
=15)
CWmin 15 / CWmax 15
Reset
Pause
Upward bursts = AMPDU aggregates. Downward pulses = 802.11 Block ACK. PER includes collisions and MCS decode failures.