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DFS is Dynamic Frequency Selection, which is a function of using 5 GHz Wi-Fi frequencies that are generally reserved for radar, such as military radar, satellite communication, and weather radar. The DFS channels vary from country to country. The main benefit to use DFS channels is to increase the number of Wi-Fi channels. It is legally required Channel Availability Check process to prevent electromagnetic interference the 5 GHz frequency with the radar. If any radar signal detects, it will switch from DFS channel to non-DFS channel automatically(If driver have DFS support) .
The scope of this work is to integrate the DFS Feature in RPI reference platforms.This document covers only integration not validation.
Target | Yocto version | Build instruction |
---|---|---|
RPI4 32bit | Dunfell | RPI 4B Model Reference Platform |
RPI4 32bit | Kirkstone | kirkstone RDK-B RPI4 32 bit |
RPI4 64bit | Dunfell | RPI 4B Model Reference Platform with 64bit Arch |
RPI4 64bit | Kirkstone | Kirkstone RDK-B RPI4 64 bit (Both User Space & Kernel Space) |
Module | TR-181 DM parameter | Purpose |
---|---|---|
CcspPandM | dmcli eRT setv Device.DeviceInfo.X_RDKCENTRAL-COM_RFC.Feature.DFS.Enable bool true | enable/disable the DFS feature. By default, it should be disabled. |
OneWifi | dmcli eRT getv Device.WiFi.Radio.2.X_COMCAST_COM_DFSEnable | This should be enabled after executed the above command. |
dmcli eRT setv Device.WiFi.Radio.2.Channel uint 100 | Setting DFS channel value | |
dmcli eRT setv Device.WiFi.ApplyRadioSettings bool true | Applying radio settings | |
dmcli eRT setv Device.WiFi.SSID.2.Enable bool false dmcli eRT setv Device.WiFi.SSID.2.Enable bool true |
Re-enable the AP for updating the new channel value in realtek drivers. | |
dmcli eRT setv Device.WiFi.ApplyAccessPointSettings bool true | Applying AP settings |
1. Enabling the DFS feature in RPI Router. By default, it's disabled.
2. Getting the current 5G Radio channel
3. Connected Client info
4.Changing the 5G channel value from non-dfs to dfs frequency
5. Re-enable the AP/Radio to update the new channel value in realtek driver
6. Connected client info with DFS frequency
Tested Image :
root@RaspberryPi-Gateway:/# cat version.txt imagename:rdkb-generic-broadband-image_rdk-next_20240605110458 BRANCH=rdk-next YOCTO_VERSION=kirkstone VERSION=5.06.05.24 SPIN=0 BUILD_TIME="2024-06-05 11:04:58" Generated on Wed Jun 05 11:04:58 UTC 2024 root@RaspberryPi-Gateway:/#
TBD - We didn't validate this feature with RADAR signals .
This rtl88x2bu driver doesn't have the channel switch support. So, we need to do the re-enable of AP/Radio whenever we switching the new channel .
REFPLTB-2925 - Getting issue details... STATUS