Madge Networks 802.11b Manuale Utente Pagina 27

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DCF
DCF, Distributed Coordination Function
No central controller; just like Ethernet
Protocols used are:
CSMA/CA (CSMA with Collision Avoidance)
Sense the channel before transmitting. If idle, transmits. It does
not sense the channel while transmitting
Waits DIFS+RandomTime before transmitting
Receiver waits SIFS time before acknowledging
Using duration field in 802.11 frame other nodes backoff this
much amount of time (NAV)
CSMA/CA with virtual channel
Perform channel reservation
RTS alerts and indicates duration of frame for sender’s range
CTS alerts and indicates duration of frame for receiver’s range
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