Re: [wireless-regdb] [PATCH] Regulatory update for 6 GHz operation in Canada (CA)

[Seth Forshee <sforshee@kernel.org>]

On Wed, Apr 20, 2022 at 08:40:51PM -0600, Dennis Bland wrote:
> With the 6 GHz band (U-NII-5, U-NII-6, U-NII-7, U-NII-8) in Canada, ISED
> introduces the concept of a fixed PSD (Power Spectral Density) for all
> supported 6 GHz channel widths.  Wider channel widths have a higher noise
> floor, therefore specifying a fixed PSD allows wider channels to
> operate at a higher EIRP to maintain the same S/N ratio as smaller
> channel widths.
> 
> Clause 4.6.2 requires non-client (AP devices to have a maximum PSD of 5
> dBm/MHz and a maximum EIRP of 30 dBm.  Clause 4.6.3 requires client (STA)
> devices to have a maximum PSD of -1 dBm/MHz.  Clause 4.4 specifies a
> maximum channel width of 320 MHz.  Clause 4.9 specifies indoor use only.
> Operation on oil platforms, vehicles, boats, trains, and drones is
> prohibited except on commercial aircraft above 10,000 feet altitude.
> There is no IR (Initiate Radiation) restriction mentioned in the 6 GHz
> specification.
> 
> The following equation is used to calculate the EIRP from the PSD and
> channel width:
> 
> EIRP = PSD + 10*log(channel width in MHz)
> 
> Using the maximum PSD values of 5 and -1 for APs and STAs respectively,
> the EIRP in dBm for a given channel width can be calculated:
> 
> Channel Width (MHz)     AP            STA
> ------------------------------------------------
> 20                      18            12
> 40                      21            15
> 80                      24            18
> 160                     27            21
> 320                     31 (max 30)   25 (max 24)
> 
> For channel widths up to 160 MHz, the maximum PSD is the limiting factor.
> For the 320 MHz channel width, the maximum EIRP is the limiting factor.
> 
> Unfortunately, because there is currently no mechanism to specify
> different power levels for AP and STA modes, and for different channel
> widths, the smallest value has to be selected, which is 12 dBm.  This
> will likely cause connectivity problems with larger channel widths until
> these additional parameters can be added.
> 
> signed-off-by: Dennis Bland <dennis@dbperformance.com>

Sorry for the delayed response. Thanks for the patch and the detailed
explanation. Everything here looks good to me.

The patch itself was corrupted. I fixed it up by hand, but for future
patches you might try 'git send-email', or if that won't work with your
email provider you can use 'git format-patch' and attach the patch file.

Also note that Signed-off-by should be capitalized. I fixed that when
applying.

Applied, thanks!

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