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@xxxxxxxxxxxxxxxxx> Applied, with the same notes as with the other patch. Thanks! _______________________________________________ wireless-regdb mailing list wireless-regdb@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/wireless-regdb
