Received-SPF: pass (google.com: domain of linux-wireless-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
MIME-Version: 1.0
References: <a79286b90cdfdee3a83397008c0f7b6d67bc7f69.1607035229.git.b.K.il.h.u+tigbuh@gmail.com>
 <YL+RDtGatz/ybG+M@ubuntu-x1>
In-Reply-To: <YL+RDtGatz/ybG+M@ubuntu-x1>
From:   b.K.il.h.u+tigbuh@gmail.com
Date:   Wed, 30 Jun 2021 17:17:37 +0200
Message-ID: <CAPuHQ=GbacSTgyimkJtx1FXp319Df=LdrPQZ6ZDnPQ_JVXueKw@mail.gmail.com>
Subject: Re: [PATCH] wireless-regdb: recent FCC report and order allows
 5850-5895 immediately
To:     Seth Forshee <seth.forshee@canonical.com>
Cc:     wireless-regdb <wireless-regdb@lists.infradead.org>,
        linux-wireless <linux-wireless@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Precedence: bulk

> On Tue, Jun 8, 2021 at 5:47 PM Seth Forshee <seth.forshee@canonical.com> =
wrote:
> 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.
>

Yes.

> 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.
>

So we would not be able to operate an OpenWrt or other Linux-based AP,
while other vendors would be allowed to do this? How is this
acceptable? How does this help in liberating the band?

> 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?
>

The 27 dBm EIRP is needed for 20 MHz operation due to spectral density
requirements. Is my information correct that regdb has no notion of
specifying a separate limit for spectral density? (If it did, we might
be able to double the EIRP for 2.4GHz of 10MHz channels)

I have summarized the reasoning in a comment of the original patch,
but let me cite it here then (copied from the more recent link you
have now given):

> "(iii) For client devices operating under the control of an indoor access=
 point in the 5.850-5.895 GHz band, the maximum power spectral density must=
 not exceed 14 dBm e.i.r.p. in any 1-megahertz band, and the maximum e.i.r.=
p. over the frequency band of operation must not exceed 30 dBm."
> "the Commission limited indoor access point EIRP spectral density to 20 d=
Bm/MHz with a maximum EIRP of 36 dBm over the bandwidth of operation (e.g.,=
 33 dBm/20 MHz and 36 dBm/40 MHz)"
> "To keep the potential for causing harmful interference low, the Commissi=
on required client devices to operate under the control of an access point,=
 and limited client device's power spectral density and maximum transmit po=
wer to 6 dB below the power permitted for the access point."