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Available values: 4 to 20 (dB).
Default value: 5 (dB) for units operating in the 0.9, 5.4 and 5.8 GHz bands. 8 (dB)
for units operating in the 4.9, 5.2 and 5.3 GHz bands.
4.2.6.2.8.3.4 Minimum Interval Between ATPC Messages
The Minimum Interval Between ATPC Messages parameter sets the minimal time
between consecutive power-up/power-down messages to a specific SU. Setting a
low value for this parameter may lead to higher overhead and to an excessive rate
of power level changes at the SUs. High values for this parameter increase the
time it will take the SUs to reach optimal transmit power level.
Available values: 1 to 3600 seconds.
Default value: 30 seconds.
4.2.6.2.8.3.5 ATPC Power Level Step
The ATPC Power Level Step parameter defines the step size to be used by the SUs
for incrementing/decrementing the Current Transmit Power after receiving a
power-up/power-down message. If the distance between the value of the Current
Transmit Power and the desired range is smaller than the step size, the power-
up/power-down message will include the specific step value required for this
condition.
Valid range: 1-20 (dB)
Default value: 5 (dB)
4.2.6.2.8.4 ATPC Parameters in SU
4.2.6.2.8.4.1 ATPC Option
The ATPC Option enables or disables the Automatic Transmit Power Control
(ATPC) algorithm. The parameter takes effect immediately. However, when
changed from Enable to Disable, the transmit power level will remain at the last
Current Transmit Power determined by the ATPC algorithm before it was
disabled. It will change to the value configured for the Initial Transmit Power
parameter only after the next reset or following loss of synchronization.
The default is Enable.
NOTE
The accuracy of the Transmit Power level is typically +/- 1 dB. However, at levels that are 15 dB or
more below the maximum supported by the hardware, the accuracy is +/- 3 dB (for information on
hardware limitations refer to the Country Codes document). At these levels the use of ATPC may
cause significant fluctuations in the power level of the transmitted signal. When operating at such
low levels, it is recommended to disable the ATPC Option and to set the Transmit Power parameter
to the average Tx Power level before the ATPC was disabled.