CSMA/CA + ACK in 802.11 Wireless LANs

• CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance)

  • Station or access point sender listens for traffic
    • If there is traffic, the sender must wait until traffic stops
    • The sender must then set a random timer and must wait while the timer is running
    • If there is no traffic when the station or access point finishes the wait, it may send

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