Transmit Power Control in IEEE 802.11 Cisco WLAN networks

The algorithm in a step-by-step

The algorithm initializes as follows :

  1. Ignore reported channel. It is not mandatory to be on the same radio channel.
  2. Send at maximum supported power level over all supported channels on both radios.

Then, every AP lists neighboring access points reordered by their reported RSSI, Received Signal Strength Indicator, in this way :

  1. Initially an access point reports a maximum of 34 neighbor.
  2. These neighbors should have an RSSI higher than -80dBm to be considered.
  3. Then only a maximum of 24 neighbor is kept per access point at controller level (that have an active CAPWAP association to this access point).
  4. A minimum of 4 valid neighbors that have RSSI higher than -70dBm (by default), is needed to trigger transmit power processing.
  5. A neighbor is removed from this list if no NDP message is received in 1 hour time interval.
  6. It is also removed from the list if its reported RSSI is less than -85dBm.

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