The fundamental access method of IEEE 802.11 is a DCF known as carrier sense multiple access with collision avoidance (CSMA/CA) scheme with exponential back-off.

• 分布协调功能(DCF)；即载波监测多址接入/冲突退避机制(CSMA/CA)；是IEEE802.；11 WLAN最基本的无线媒质访问方式。