name: DFS
full_form: Dynamic Frequency Selection
context: The concept surfaced around 2001 in the ECC for handling uniform spread of WLAN interference into satellite and radar services, but was soon extended to include methods for discovery and avoidance of frequencies used by the radar service in the preparation work for WRC 2003. Use of DFS in accordance with Annex 1 of ITU-R Recommendation M.1652 [39] is mandated as per Resolution 229 [38]. The 5 GHz Harmonized European Standard developed by ETSI TC BRAN was the first to include these DFS rules (EN 301 893 V1.2.3 in 2003), the DFS test specification included in this standard therefore became the basis for the development of the FCC DFS test specification and other test specifications in other countries. For NR-U, it appears that conformance testing would only have to be performed for the BS. Already at the outset in ITU-R M.1652 it was made clear that full DFS functionality may not have to be implemented in all devices, only those controlling the transmission [39]: 2.1 Detection
description: Dynamic Frequency Selection (DFS) is a technology used to avoid interference with radar systems and other wireless services by dynamically selecting frequencies for transmission. It was first introduced in the early 2000s and has since been mandated by regulatory bodies such as the FCC and ETSI.
explanation: The context describes DFS as a method for managing frequency usage in wireless communication to prevent interference, which is a core function of telecommunications technologies.
section_title: 4.1.4Applicability of DFS requirements
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