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Dynamic Frequency Selection (DFS) is a channel allocation scheme specified for wireless LANs, commonly known as Wi-Fi. It is designed to prevent electromagnetic interference by avoiding co-channel operation with systems that predated Wi-Fi, such as military radar , satellite communication , and weather radar , and also to provide on aggregate a ...
IEEE 802.11h-2003, or simply 802.11h, refers to a 2003 amendment added to the IEEE 802.11 standard for Spectrum and Transmit Power Management Extensions. It addresses problems like interference with satellites and radar using the same 5 GHz frequency band. [1]
Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.
In Fixed Channel Allocation or Fixed Channel Assignment (FCA) each cell is given a predetermined set of frequency channels. FCA requires manual frequency planning, which is an arduous task in time-division multiple access (TDMA) and frequency-division multiple access (FDMA) based systems since such systems are highly sensitive to co-channel interference from nearby cells that are reusing the ...
My neighbors' 5 GHz channels are all using the non-DFS channels -- now that I have moved to a DFS channel, I have no other signals competing with mine. This is interesting -- it might not make much real-world difference -- but as of now, there's a giant (DFS) band in the middle of the 5 GHz spectrum that I can use all by myself!
In 2007, the FCC began requiring that devices operating in channels 52, 56, 60 and 64 must have Dynamic Frequency Selection (DFS) capabilities. This is to avoid communicating in the same frequency range as some radar. In 2014, the FCC issued new rules [10] for all devices due to interference with government weather radar systems. Fines and ...
The problem is that usage by the primary services in these bands may change over time (as is the case with some radar systems) or vary by sub-channel based on location (as is the case in the TV bands "white spaces") 802.11y, along with the continued advances in multi-band radio technology, may provide a solution to this problem by granting ...
Inviting yourself to a channel you have "self invite" access on (+i flag set in ChanServ) Adding a user to an "invite list" for automatic access; Getting a copy of the invite list for a channel; Keeping ChanServ in a channel, so it does not empty and so the invite list is not easily lost; To specify a channel as invite-only: