The French city of Brest hosted last 13-14 September, at the invitation of the Agence Nationale des Fréquences (ANFR), the twentieth meeting of the working group ECC TG3 - UWB (ultra wide band), which is mandated to develop regulatory solutions for devices that use UWB technologies in bands below 10.6 GHz. Previously, on 12 September, a working group on mitigation techniques met to go over development of the DAA (detect and avoid) mitigation technique for UWB devices.
ECC TG3 is studying the development of mitigation techniques for devices that use UWB technology in various frequency bands. In the 3.4-4.2 GHz band the requirements for the DAA flexible mitigation technique are being defined; it will ensure the protection of BWA (broadband wireless access) systems in interior spaces. As done for the LDC (low duty cycle) mitigation technique, the possibility of extending the DAA technique throughout the 3.4-4.8 GHz band is being weighed. Various topics were debated, among others the effect that controlling the power of BWA systems may have on defining the DAA technique.
This mitigation technique is also being developed for the 3.1-3.4 GHz band, where military radars operate. It was indicated that the detection mechanism in this band needs to be validated along with the technical characteristics of the military radars, which are needed to define the DAA mitigation technique.
Likewise under study is verification of whether the LDC mitigation technique, which has already been defined for the 3.4-4.8 GHz band, guarantees the protection of radars operating in the 3.1-3.4 GHz band. Regarding the definition of mitigation techniques in the 8.5-9 GHz band, the meeting saw no major developments.
A progress report on DAA mitigation technique for the 3.1-[4.2/4.8] GHz and 8.5-9 GHz bands will be drawn up by December 2007. The development of a regulatory solution to allow the installation of fixed UWB devices in exterior spaces remains under study.
