Transmit Power Control in IEEE 802.11 Cisco WLAN networks

In a controller based architecture, NDP messages over-the-air information is further sent from APs to corresponding controller (WLC, Wireless LAN Controller) via CAPWAP, Control and Provisioning of Wireless Access Points, protocol, over the wired interface.

Next, all controllers forward this information to the RF group leader, which is elected among the RF group controllers, to process this information.

After  processing of this information, the RF group leader returns a new radio transmit power level and frequency assignment plan to the corresponding RF group controllers that apply it to their attached network wide.


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