802.11 Modes of Operation
• Most wireless devices cannot transmit and listen
at the same time on a single frequency, thus
CSMA/CD is not used
• The supported modes of operation are:
– DCF, Distributed Coordination Function
• No central controller; just like Ethernet
• Protocols used are:
– CSMA/CA (CSMA with Collision Avoidance)
– CSMA/CA with virtual channel
–PCF, Point Coordination Function
• The base station controls all activities
• Prioritized transmissions possible
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