[PATCH] wireless-regdb: Extend 5470-5725 MHz range to 5730 MHz for Taiwan (TW)

[PATCH] wireless-regdb: Extend 5470-5725 MHz range to 5730 MHz for Taiwan (TW)

[Chen-Yu Tsai]

From: Chen-Yu Tsai <wens@csie.org>

This range ends at 5725 MHz, but channel 144 extends to 5730 MHz.
The Linux kernel however does not seem capable of considering them
most restrictive subset of multiple rules.

Since 5725 ~ 5730 MHz belongs to the next range which has looser
requirements, we can do this manually and extend the range by 5 MHz
to make the kernel happy and be able to use channel 144.

Also, looking at the US regulations, which the TW ones are based on,
The DFS range ends at 5730 MHz, while the next range starts at 5735
MHz. This doesn't match the actual regulations, but is skewed to meet
wireless channel boundaries. I prefer the database match the law,
and be adjuested only if necessary.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---

I have a vague impression that you asked about the range boundaries
when I first updated the rules for Taiwan. And here we are again.

---
 db.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/db.txt b/db.txt
index 37393e6..2e149b6 100644
--- a/db.txt
+++ b/db.txt
@@ -1249,7 +1249,11 @@ country TW: DFS-FCC
 	# 5.15 ~ 5.25 GHz: 30 dBm for master mode, 23 dBm for clients
 	(5150 - 5250 @ 80), (23), AUTO-BW
 	(5250 - 5350 @ 80), (23), DFS, AUTO-BW
-	(5470 - 5725 @ 160), (23), DFS
+	# This range ends at 5725 MHz, but channel 144 extends to 5730 MHz.
+	# Since 5725 ~ 5730 MHz belongs to the next range which has looser
+	# 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
 	(5725 - 5850 @ 80), (30)
 	# 60g band, LP0002 section 3.13.1.1 (3)(C), EIRP=40dBm(43dBm peak)
 	(57000 - 66000 @ 2160), (40)
-- 
2.20.1

Re: [PATCH] wireless-regdb: Extend 5470-5725 MHz range to 5730 MHz for Taiwan (TW)

[Seth Forshee]

On Fri, Jul 26, 2019 at 11:05:38AM +0800, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@csie.org>
> 
> This range ends at 5725 MHz, but channel 144 extends to 5730 MHz.
> The Linux kernel however does not seem capable of considering them
> most restrictive subset of multiple rules.
> 
> Since 5725 ~ 5730 MHz belongs to the next range which has looser
> requirements, we can do this manually and extend the range by 5 MHz
> to make the kernel happy and be able to use channel 144.
> 
> Also, looking at the US regulations, which the TW ones are based on,
> The DFS range ends at 5730 MHz, while the next range starts at 5735
> MHz. This doesn't match the actual regulations, but is skewed to meet
> wireless channel boundaries. I prefer the database match the law,
> and be adjuested only if necessary.
> 
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>
> ---
> 
> I have a vague impression that you asked about the range boundaries
> when I first updated the rules for Taiwan. And here we are again.

I don't recall, but I too prefer that we keep the boundaries mostly in
line with the regulations, not the wireless channel boundaries. Here it
does seem appropriate though to borrow the extra 5MHz into a more
rescrictive rule.

I wasn't sure about having rules with overlapping ranges. I've been
looking at the code though, and I don't see that it will be an issue. I
may give a few more days though to see if anyone else knows some reason
I missed that it could be a problem.

Thanks,
Seth

> 
> ---
>  db.txt | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/db.txt b/db.txt
> index 37393e6..2e149b6 100644
> --- a/db.txt
> +++ b/db.txt
> @@ -1249,7 +1249,11 @@ country TW: DFS-FCC
>  	# 5.15 ~ 5.25 GHz: 30 dBm for master mode, 23 dBm for clients
>  	(5150 - 5250 @ 80), (23), AUTO-BW
>  	(5250 - 5350 @ 80), (23), DFS, AUTO-BW
> -	(5470 - 5725 @ 160), (23), DFS
> +	# This range ends at 5725 MHz, but channel 144 extends to 5730 MHz.
> +	# Since 5725 ~ 5730 MHz belongs to the next range which has looser
> +	# 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
>  	(5725 - 5850 @ 80), (30)
>  	# 60g band, LP0002 section 3.13.1.1 (3)(C), EIRP=40dBm(43dBm peak)
>  	(57000 - 66000 @ 2160), (40)
> -- 
> 2.20.1
> 

Re: [PATCH] wireless-regdb: Extend 5470-5725 MHz range to 5730 MHz for Taiwan (TW)

[Seth Forshee]

On Fri, Aug 09, 2019 at 03:50:25PM -0500, Seth Forshee wrote:
> On Fri, Jul 26, 2019 at 11:05:38AM +0800, Chen-Yu Tsai wrote:
> > From: Chen-Yu Tsai <wens@csie.org>
> > 
> > This range ends at 5725 MHz, but channel 144 extends to 5730 MHz.
> > The Linux kernel however does not seem capable of considering them
> > most restrictive subset of multiple rules.
> > 
> > Since 5725 ~ 5730 MHz belongs to the next range which has looser
> > requirements, we can do this manually and extend the range by 5 MHz
> > to make the kernel happy and be able to use channel 144.
> > 
> > Also, looking at the US regulations, which the TW ones are based on,
> > The DFS range ends at 5730 MHz, while the next range starts at 5735
> > MHz. This doesn't match the actual regulations, but is skewed to meet
> > wireless channel boundaries. I prefer the database match the law,
> > and be adjuested only if necessary.
> > 
> > Signed-off-by: Chen-Yu Tsai <wens@csie.org>

Sorry for the delay, applied now. Thanks!