Hardware: ALFA R36AH, with QCA9531
System: OpenWrt 22.03.03
Hello,
I am trying to get the device with hardware/system described above, to pass the Adaptivity test for CE certification (EN 300 328 Clause 4.3.2.6).
When an interference signal is added (AWGN), the device does not backoff, so it seems like the CCA is not working correctly at all. The CCA threshold measured in my test setup is way above the level required by 802.11 and EN 300 328.
Can anyone help with this? Is there a patch that needs to be applied to get the CCA working correctly? Or some configuration that needs to be enabled?
The R36A is supported by OpenWrt, and the R36AH is very similar (just has added support for the Alfa Tube-U4G 4G USB modem).
With regards to the driver, we are using the ath9k driver, which is the driver supported by the Qualcomm QCA9531 chipset. And that driver does support etsi dfs as well. Although the thing I have noticed, is that I am unable to change the country code for the "phy#0". No matter what I do, it remains "country US".
It appears you are using firmware that is not from the official OpenWrt project.
When using forks/offshoots/vendor-specific builds that are "based on OpenWrt", there may be many differences compared to the official versions (hosted by OpenWrt.org). Some of these customizations may fundamentally change the way that OpenWrt works. You might need help from people with specific/specialized knowledge about the firmware you are using, so it is possible that advice you get here may not be useful.
Ask for help from the maintainer(s) or user community of the specific firmware that you are using.
Provide the source code for the firmware so that users on this forum can understand how your firmware works (OpenWrt forum users are volunteers, so somebody might look at the code if they have time and are interested in your issue).
If you believe that this specific issue is common to generic/official OpenWrt and/or the maintainers of your build have indicated as such, please feel free to clarify.
