Re: [wireless-regdb] wireless-regdb: Regulatory rules for Hong Kong (HK)

[Seth Forshee <sforshee@kernel.org>]

On Sun, Apr 16, 2023 at 04:14:19PM +0000, tavio.wong wrote:
> 
> On Sunday, April 16th, 2023 at 8:00 AM, Seth Forshee <sforshee@kernel.org> wrote:
> > On Wed, Mar 22, 2023 at 03:14:41PM +0000, tavio.wong wrote:
> > 
> > > Thanks for the feedback.
> > > 
> > > I have adjusted the rules as follows based on your suggestions and further research on FCC rules:
> > > 
> > > country HK: DFS-ETSI
> > > (2400 - 2483.5 @ 40), (30)
> > > (5150 - 5250 @ 80), (23), AUTO-BW, NO-OUTDOOR
> > > (5250 - 5350 @ 80), (23), DFS, AUTO-BW, NO-OUTDOOR
> > > (5470 - 5725 @ 160), (24), DFS
> > > (5725 - 5850 @ 80), (30)
> > > 
> > > 1. The ranges have been adjusted to align with HK regulations.
> > > 
> > > 2. For 2400-2483.5 MHz, max power is set to 1 W (30 dBm) based on [1] 47 CFR 15.247(b)(3).
> > > 
> > > 3. For 5470-5725 MHz, max power is set to 250 mW (24 dBm) based on [2] 47 CFR 15.407(a)(2).
> > > 
> > > 4. For 5725-5850 MHz, max power is set to 1 W (30 dBm) based on [3] 47 CFR 15.407(a)(3)(i).
> > > 
> > > 5. 5725-5730 MHz (Channel 144) is already covered by the last range (5725-5850 MHz) so no changes are necessary.
> > > 
> > > I have also cross-checked the limits to make sure they don't exceed those in the rules for US. The only difference in limits is in 5250-5350 MHz where HK regulations further restrict it to 200 mW (23 dBm).
> > 
> > 
> > Since explicit power limits are given I think we should be able to use
> > those. The reference to the US rules probably refers to other
> > requirements. So for 3 we can use 27 dBm and for 4 we can use 36 dBm.
> 
> OK.
> 
> > 
> > > One last suggestion: I noticed 6 GHz band is allowed for outdoor use at a max of 14 dBm (Section 3.2 of [4]) though it's only for licensed devices. Can it also be added to the rules as below?
> > > (5925 - 6425 @ 160), (14)
> > 
> > 
> > Yes, we could do it this way, or use the 24 dBm limit with NO-OUTDOOR.
> 
> I guess I will leave it this way for now so that the band is usable in both indoor and outdoor settings.
> 
> Based on the latest discussion, I have updated the rules as below:
> 
> # Source:
> # https://www.ofca.gov.hk/filemanager/ofca/en/content_401/hkca1039.pdf (2.4 GHz and 5 GHz)
> # https://www.ofca.gov.hk/filemanager/ofca/en/content_401/hkca1081.pdf (6 GHz)
> country HK: DFS-ETSI
>         (2400 - 2483.5 @ 40), (36)
>         (5150 - 5250 @ 80), (23), AUTO-BW, NO-OUTDOOR
>         (5250 - 5350 @ 80), (23), DFS, AUTO-BW, NO-OUTDOOR
>         (5470 - 5725 @ 160), (27), DFS
>         (5725 - 5850 @ 80), (36)
>         (5925 - 6425 @ 160), (14)
> 
> If the rules look fine to you, I will try to submit a patch for this change.

Sorry, just noticed that I hadn't responded.

That looks fine. I'd suggest also slightly tweaking the bands like this:

        (5470 - 5730 @ 160), (27), DFS
        (5730 - 5850 @ 80), (36)

We do this for some other countries so that channel 144 is usable, and
since 5470-5725 is more restrictive than 5725-5850 it doesn't pose any
problems.

Please go ahead and submit a patch!

Thanks,
Seth

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