Transmit Power Control in IEEE 802.11 Cisco WLAN networks

  1. The first condition that triggers TPC processing is met:

RSSI_3rd = -55dbm > -70dbm

  1. The second condition is also met:

Tx_Hysterisis_Current = Tx_Current + (Tx_Thresh – RSSI_3rd)
= 20 + (-67-(-55)) = 8 > Tx_Hysterisis_Thresh = 6db

  1. We reduce the power by half (3db):

Tx_Current = 17db

  1. After 10 minutes and if:

Tx_Max = 20db,
Tx_Current = 17db,
Tx_Thresh = -67dbm,
RSSI_3rd = -55dbm,
Tx_Hysterisis_Thresh= 6db,

  1. We verify the the fist condition is still met
  2. But this is not the case for the second condition as:

Tx_Hysterisis_Current = Tx_Current + (Tx_Thresh – RSSI_3rd)
= 17 + (-67-(-55)) = 5 < Tx_Hysterisis_Thresh = 6db

  1. Then we keep the current power level:

Tx_Current = 17db.

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