On Thu, Dec 03, 2020 at 11:40:30PM +0100, bkil wrote: > The new band is called U-NII-4. > > The report recommends combining it with 5725-5895 to allow 160 MHz > bandwidth, but that's technically not that easy with regdb due to the > differing restrictions of the two parts. Marking the line for U-NII-3 > NO-OUTDOOR and PTMP-ONLY along with extending its range would be a > possible workaround, but this needs to be discussed. > > I don't see a requirement for TPC, hence reducing EIRP by 3dB is not > needed. I've marked it 33dBm (minus 6dB for clients) to cope with 20MHz, > but the band can support higher power, though the logic is complicated. > > The upper subband (5895-5925 MHz) of the new band is reserved for ITS. > > "We limit unlicensed use to indoor operations in recognition of the > potential that ITS licensees may currently be operating" > > "We also proposed that U-NII-4 devices be permitted to operate at the same > power levels as U-NII-3 devices." > > "For the U-NII-4 band, indoor access point EIRP will be limited to > 33 dBm/20 MHz and 36 dBm/40 MHz. When combined with U-NII-3 band spectrum, > indoor access point EIRP can scale to 36 dBm for 80 and 160 megahertz > channels." > > "Client devices would be limited to power levels 6 dB below the power > limits for access points." > > "the First Report and Order prohibit U-NII-4 client-to-client > communications to protect co-channel incumbent ITS" > > Signed-off-by: bkil <b.K.il.h.u+tigbuh@xxxxxxxxx> I'm not sure why this was delayed, but it looks like it has finally gone into effect as of June 2: https://www.federalregister.gov/documents/2021/05/03/2021-08802/use-of-the-5850-5925-ghz-band We discussed some of the details before. I'm reading over it again to refresh my memory, so let's revisit the changes I think are required, below. > --- > db.txt | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/db.txt b/db.txt > index c71a03a..e6dd063 100644 > --- a/db.txt > +++ b/db.txt > @@ -1587,7 +1587,10 @@ country US: DFS-FCC > # requirements, we can extend the range by 5 MHz to make the kernel > # happy and be able to use channel 144. > (5470 - 5730 @ 160), (23), DFS > - (5730 - 5850 @ 80), (30) > + (5730 - 5850 @ 80), (30), AUTO-BW > + # https://www.fcc.gov/document/fcc-modernizes-59-ghz-band-improve-wi-fi-and-automotive-safety-0 > + # max. 33 dBm AP @ 20MHz, 36 dBm AP @ 40Mhz+, 6 dB less for clients > + (5850 - 5895 @ 40), (27), NO-OUTDOOR, PTMP-ONLY, AUTO-BW I think we concluded previously that both 5730-5850 and 5850-5895 should have a max bandwidth of 160 MHz to permit use of 160 MHz across these channels. We also discussed using NO-IR for 5850-5895. The regulations forbid active scans, and PMTP-ONLY does not prevent them. NO-IR appears to be the only option which conforms to this restriction, though that will also block running an AP in this range. I also read the max EIRP for clients as 30 dBm without any TPC requirement. Did I overlook something which limits the EIRP to 27 dBm? Thanks, Seth _______________________________________________ wireless-regdb mailing list wireless-regdb@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/wireless-regdb
