On Fri, Jul 26, 2019 at 11:05:38AM +0800, Chen-Yu Tsai wrote: > From: Chen-Yu Tsai <wens@xxxxxxxx> > > 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@xxxxxxxx> > --- > > 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 >
