Re: [wireless-regdb] [PATCH] Regulatory update for 6 GHz operation in United States (US)

[Seth Forshee <sforshee@kernel.org>]

On Wed, Apr 20, 2022 at 08:56:38PM -0600, Dennis Bland wrote:
> With the 6 GHz band (U-NII-5, U-NII-6, U-NII-7, U-NII-8) in USA, the FCC
> introduces the concept of a fixed PSD (Power Spectral Density) for all
> supported 6 GHz channel widths for LPI (Low Power Indoor) environments.
> 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.
> 
> While the 6 GHz specification also allows a "Standard" power mode with
> higher EIRP and PSD limits, these devices are also required to employ
> AFC (Automatic Frequency Coordination) which normally requires GNSS.
> Currently there is no way to specify different EIRP and PSD levels for
> APC and non-APC devices.  Therefore, only LPI mode is considered here.
> 
> LPI requires non-client (AP) devices to have a maximum PSD of 5 dBm/MHz
> and a maximum EIRP of 30 dBm.  LPI requires client (STA) devices to have
> a maximum PSD of -1 dBm/MHz.  The maximum channel width is 320 MHz.
> 
> 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.
> 
> 6 GHz operation on oil platforms, vehicles, boats, trains, and drones is
> prohibited except on commercial aircraft above 10,000 feet altitude.
> An IR (Initiate Radiation) restriction is mentioned in the 6 GHz
> specification.
> 
> signed-off-by: Dennis Bland <dennis@dbperformance.com>

Applied, with the same notes as with the other patch. Thanks!

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