IEEE 802.11e IEEE 802.11e
QoS QoS for Wireless LAN: for Wireless LAN:
A Research Direction A Research Direction
IEEE 802.11 MAC Layer
Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA)
–Different from CAMA/CD (802.3)
–STA cannot hear the collisionsignal as in the wired world.
Two access methods:
–Distributed Coordination Function (DCF)
–Point Coordination Function (PCF) -optional
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