IEEE 802.11h-2003, or simply802.11h, refers to a 2003 amendment added to theIEEE 802.11standard for Spectrum and Transmit Power Management Extensions. It addresses problems like interference with satellites and radar using the same5 GHz frequency band.[1] It was originally designed to address European regulations but is now applicable in many other countries. The standard providesDynamic Frequency Selection (DFS) andTransmit Power Control (TPC) to the802.11a PHY. It has since been integrated into the full IEEE 802.11-2007 standard.
Wireless technology has been more and more popular and a lot of standards have been finalized over the past decade. This holds especially forISM bands (Industrial, Scientific and Medical) which are unlicensed and free to use. The problem, however, is the coexistence between these heterogeneous wireless networks. To address the coexistence problems in those bands, the IEEE has started the 802.11h Working Group to make recommendations for better future coexistence. It addresses problems like interference with satellites and radar using the same 5 GHz frequency band.[2][page needed]
