Transmit Power Control is a technical mechanism used within some networking devices in order to prevent too much unwanted interference between different wireless networks (e.g. the owner's network and the neighbour's network).
The network devices supporting this feature are IEEE 802.11h Wireless LAN devices in the 5 GHz band compliant to the IEEE 802.11a. The idea of the mechanism is to automatically reduce the used transmission output power when other networks are within range. Reduced power means reduced interference problems and increased battery capacity. The power level of a single device can be reduced by 6 dB which should result in an accumulated power level reduction (the sum of radiated power of all devices currently transmitting) of at least 3 dB (which is half of the power).
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