IEEE 802.11h
802.11 is a set of
IEEE standards that govern wireless networking transmission methods. They are commonly used today in their
802.11a,
802.11b, and
802.11g versions to provide wireless connectivity in the home, office and some commercial establishments.
IEEE 802.11h is the
IEEE standard for Spectrum and Transmit Power Management Extensions. It solves problems like interference with satellites and radar using the same 5 GHz frequency band. It was originally designed to address European regulations but is now applicable in many other countries. The standard provides Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) to the
IEEE 802.11a MAC.
DFS ensures that channels containing radar are avoided by an
Access Point (AP) and energy is spread acoss the band to reduce interference to satellites. TPC ensures that the average power is less than the regulatory maximum to reduce interference to satellites.
See also
IEEE 802.11a High-speed Physical Layer in the 5 GHz band
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The IEEE 802.11h-2003 Standard*
Status of the project 802.11hIEEE Task Group TGh
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Quick Guide to IEEE 802.11 WG*
802.11h helps WLANs share spectrum Michael See
Network World July 19, 2004
