好记性不如铅笔头

WIFI, 网络通讯

DFS简单笔记

参考
【 https://kb.netgear.com/000060371/What-is-Dynamic-Frequency-Selection-and-how-does-it-work-with-my-NETGEAR-router
【 https://www.wi-fi.org/knowledge-center/faq/what-is-dynamic-frequency-selection-dfs
【 https://www.networkcomputing.com/wireless-infrastructure/dynamic-frequency-selection-why-its-critical-80211ac
What is dynamic frequency selection (DFS)?
In many countries, regulatory requirements may limit the number of 5 GHz channels available or place additional restrictions on their use because the spectrum is shared with other technologies and services. For instance, in the US and other countries, some of the Unlicensed National Information Infrastructure (U-NII) bands are used by radar systems. Wi-Fi networks operating in those bands are required to employ a radar detection and avoidance capability. The IEEE 802.11h standard addresses this requirement by adding support for DFS and transmit power control (TPC) on every DFS channel.

Dynamic Frequency Selection (DFS) is a legally required feature for all WiFi devices that share the 5 GHz band with radar.   
The IEEE 802.11 standard allows devices like routers and access points (APs) to share the 5 GHz radio spectrum with radar. Radar signals are vulnerable to interference from other devices using the same spectrum. DFS enables a router or AP to detect radar signals and switch their operating frequency to prevent interference. This process ensures that radar systems send and receive accurate information.

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