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Distributed Coordination Function (DCF)
Station 1
Tx Data to STA 2
Rx data from STA 1
Station 2
Station 3
Detects channel busy
Detects channel busy
Station 4
,
Short interval ensures ACK is
Short deferral
sent while other stations wait
ACK to STA1
Distributed inter-frame deferral
Distributed inter-
frame deferral
Distributed inter-frame deferral
Distributed inter-
frame deferral
longer
STA 3's back-off is shorter than
STA 4's therefore it begins
transmission first
Random back-off
Random back-off
Tx Data
© Siemens, 2002
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