On 2021-10-06 23:07, Seth Forshee wrote:
On Thu, Sep 30, 2021 at 02:27:28AM +0900, Sungbo Eo wrote:
This patch is based on MSIT Public Notification 2020-113 ("Unlicensed Radio
Equipment Established Without Notice"), officially announced on 2021-01-06.
Extend the last 5 GHz frequency range to 5850 MHz.
WiFi 6E is now allowed with the following restrictions:
* Indoor: the full 1.2 GHz range, up to 160 MHz bandwidth and 250mW EIRP
* Outdoor: the lower 500 MHz range, up to 160 MHz bandwidth and 25mW EIRP
Here only the former entry is added.
And also update the regulatory source links.
Signed-off-by: Sungbo Eo <mans0n@xxxxxxxxxx>
---
I have two questions.
The regulation has one more restriction:
The TX power should not exceed 2.5 mW/MHz
when the frequency range includes the whole or a part of 5230-5250 MHz
and the bandwidth is equal to or less than 40 MHz.
That leads to the followings:
5230-5250 @ 20 -> 17 dBm
5210-5250 @ 40 -> 20 dBm
5170-5250 @ 80 -> 23 dBm
Is it possible to add this rule without lowering the TX power for 80 MHz bandwidth?
I've tried to look at the documents, but much of the information appears
to be in images where machine translation doesn't work, and I haven't
been able to find English versions.
Oops, sorry. I should have prepared it in more convertible format.
There's no English version of it, but at least I could find a HWP
document file [1] that contains regular tables instead of images. (The
URL is from the "attached files" tab in the source link.)
You can open it with a dedicated viewer [2] or an online viewer [3]. But
those free viewers do not offer conversion to DOC or HTML. (It seems the
dedicated one has "print to PDF" feature, though.)
I also tried an online convert tool but it failed due to the long
processing time... I can send you converted versions myself if you prefer.
[1] https://www.law.go.kr/LSW//flDownload.do?flSeq=93728653
[2] https://www.hancom.com/cs_center/csDownload.do
[3] https://hwp.polarisoffice.com/
Taking the above at face value, I actually get slightly lower EIRP
values for a PSD of 2.5 mW/MHz (EIRP = PSD + 10 * log(bandwidth)): 16
dBm for 20 MHz and 19 dBm for 40 MHz.
I thought log(2.5) equals 0.4? We also have 2.5 mW/MHz * 40 MHz = 100 mW.
We don't currently have any way to
express PSD limits in the database nor a way to express different power
limits for different bandwidths, so it's not possible to comply with the
PSD limits for 20/40 MHz without also lowering the EIRP for 80 MHz.
Too bad. :( I'll prepare v2 soon.
And do we need AUTO-BW for 6E channels? I thought it is for merging adjacent frequency ranges.
That is correct. Since there are no adjacent rules, AUTO-BW doesn't make
sense.
Okay, thanks!
Regards,
Sungbo
Thanks,
Seth
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