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transmit power control (802.11a) (TPC)

Transmitted Power Control (TPC) is a control for the radiated transmit power. This function is prescribed by the German Federal Network Agency in WLANs and in broadband radio access technologies and is intended to minimize interference with other radio systems such as those for military radar systems or those for satellite communications.

  1. In802.11a WLANs, the European Telecommunications Standards Institute( ETSI) requires the TPC function to control the transmitted power. The German Federal Network Agency has made the general assignment of 802.11a devices for the 5 GHz band dependent on this function and allows a transmit power, EIRP, of 30 mW indoors for access points( AP) that do not have the TPC function. Devices with this feature are allowed to transmit at 60 mW in the lower frequency range between 5.150 GHz and 5.350 GHz. If the devices have the TPC function and Dynamic Frequency Selection( DFS), then a transmission power of 200 mW is permitted indoors.
  2. For Broadband Fixed Wireless Access( BFWA), the German Federal Network Agency stipulates a maximum transmit power of 4 W for both point-to-point and point-to-multipoint connections. In addition, a spectral transmission power of max. 200 mW/ MHz applies.
Englisch: transmit power control (802.11a) - TPC
Updated at: 13.04.2009
#Words: 186
Links: power (P), broadband, interference (I), satellite communications (Satcom), European telecommunications standards institute (ETSI)
Translations: DE

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