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

On Sunday, April 16th, 2023 at 8:00 AM, Seth Forshee <[email protected]> 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.

Thanks for your time and your help!

Regards,
Tavio

> 
> Thanks,
> Seth

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