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References: <20230903102022.11186-1-me@ndoo.sg>
In-Reply-To: <20230903102022.11186-1-me@ndoo.sg>
Reply-To: wens@kernel.org
From: Chen-Yu Tsai <wens@kernel.org>
Date: Fri, 22 Dec 2023 12:35:19 +0800
Message-ID: <CAGb2v65uD9TQuMzrMo8JoWEMp8WbVrKAf92tn17tA98GXdPWZQ@mail.gmail.com>
Subject: Re: [wireless-regdb] [PATCH] wireless-regdb: Update regulatory rules
 for Singapore (SG) for September 2023
To: Andrew Yong <me@ndoo.sg>
Cc: linux-wireless@vger.kernel.org, wireless-regdb@lists.infradead.org
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On Sun, Sep 3, 2023 at 9:25=E2=80=AFPM Andrew Yong <me@ndoo.sg> wrote:
>
>  - Update regulatory rules for September 2023 IMDA TS SRD [1]
>  - Enable 5945 - 6425 MHz (Wi-Fi 6E) band per legislation
>  - Switch units from dBm to mW to match values listed in legislation
>  - Allow AUTO-BW between 5470 - 5850 MHz to permit additional 160 MHz BW =
options
>
> [1] https://www.imda.gov.sg/-/media/imda/files/regulation-licensing-and-c=
onsultations/ict-standards/telecommunication-standards/radio-comms/imdatssr=
d.pdf

Thanks for the patch!

> Signed-off-by: Andrew Yong <me@ndoo.sg>
> ---
>  db.txt | 34 ++++++++++++++++++----------------
>  1 file changed, 18 insertions(+), 16 deletions(-)
>
> diff --git a/db.txt b/db.txt
> index fdc2c13..cbe1a88 100644
> --- a/db.txt
> +++ b/db.txt
> @@ -1584,25 +1584,27 @@ country SE: DFS-ETSI
>         # 60 GHz band channels 1-4 (ETSI EN 302 567)
>         (57000 - 66000 @ 2160), (40)
>
> -# https://www.imda.gov.sg/-/media/Imda/Files/Regulation-Licensing-and-Co=
nsultations/ICT-Standards/Telecommunication-Standards/Radio-Comms/IMDATSSRD=
.pdf
> -# IMDA TS SRD, Issue 1 Revision 1, April 2019, subsequently "IMDA TS SRD=
"
> -# 2400 - 2483.5 MHz: IMDA TS SRD, Table 1 (25); ANSI C63.10-2013 and FCC=
 Part 15 Section 15.247 or EN 300 328
> -# 5150 - 5350 MHz: IMDA TS SRD, Table 1 (29); FCC Part 15 Section 15.407=
 (1) 5.15-5.25 GHz (2) 5.25-5.35 GHz; EN 301 893
> -# 5470 - 5725 MHz: IMDA TS SRD, Table 1 (30); FCC Part 15 Section 15.407=
 (2) 5.47-5.725 GHz; EN 301 893
> -# 5725 - 5850 MHz: IMDA TS SRD, Table 1 (27); FCC Part 15 Section 15.247=
; FCC Part 15 Section 15.407 (3) 5.725-5.85 GHz
> -# 57000 - 66000 MHz: IMDA TS SRD, Table 1 (31); ETSI EN 302 567
> -# Note: 27dBm for 5470-5725MHz bands is 3dBm reduction per FCC Part 15 S=
ection 15.407 (2) 5.47-5.725 GHz; EN 301 893 as referenced by IMDA TS SRD
> +# https://www.imda.gov.sg/-/media/imda/files/regulation-licensing-and-co=
nsultations/ict-standards/telecommunication-standards/radio-comms/imdatssrd=
.pdf
> +# IMDA TS SRD, Issue 1 Revision 3, Sep 2023, subsequently "IMDA TS SRD"
> +# 2400 - 2483.5 MHz: IMDA TS SRD, Table 1 Sub-band 32e
> +# 5150 - 5350 MHz: IMDA TS SRD, Table 1 Sub-band 33a
> +# 5470 - 5725 MHz: IMDA TS SRD, Table 1 Sub-band 34
> +# 5725 - 5850 MHz: IMDA TS SRD, Table 1 Sub-band 35
> +# 5945 - 6425 MHz: IMDA TS SRD, Table 1 Sub-band 45b
> +# 57000 - 66000 MHz: IMDA TS SRD, Table 1 Sub-band 40
> +# Note: 500mW for 5470-5725MHz bands per FCC Part 15 Section 15.407 (2) =
5.47-5.725 GHz as referenced by IMDA TS SRD
>  #  AU and BG regulatory domains use the same interpretation of cited FCC=
 and ETSI standards
> -# Note: The transmit power for 5250-5350MHz bands can be raised by 3dBm =
when TPC is implemented: IMDA TS SRD Table 1 (29)
> -# Note: The transmit power for 5470-5725MHz bands can be raised by 3dBm =
when TPC is implemented: IMDA TS SRD Table 1 (30)
> +# Note: The transmit power for 5250-5350MHz bands can be raised by 3dBm =
when TPC is implemented: IMDA TS SRD, Table 1 Sub-band 33a
> +# Note: The transmit power for 5470-5725MHz bands can be raised by 3dBm =
when TPC is implemented: IMDA TS SRD Table 1 Sub-band 34

"... raised by 100 mW ..." given the new units?

Also, such a provision is not given for 5470-5725MHz in the spec. My
interpretation of the text is that a "reference" is referencing other
regulations for "reference" when designing the local rules, not that it
allows following those references directly, unless explicitly noted.

>  country SG: DFS-FCC
> -       (2400 - 2483.5 @ 40), (23)
> -       (5150 - 5250 @ 80), (23), AUTO-BW
> -       (5250 - 5350 @ 80), (20), DFS, AUTO-BW
> -       (5470 - 5725 @ 160), (27), DFS
> -       (5725 - 5850 @ 80), (30)
> -       (57000 - 66000 @ 2160), (40)
> +       (2400 - 2483.5 @ 40), (200 mW)
> +       (5150 - 5250 @ 80), (200 mW), AUTO-BW
> +       (5250 - 5350 @ 80), (100 mW), DFS, AUTO-BW
> +       (5470 - 5725 @ 160), (500 mW), DFS, AUTO-BW

This needs more justification. Unlike for the 5.15 ~ 5.35 GHz range,
the standard does _not_ give an option without TPC for this band.

> +       (5725 - 5850 @ 80), (1000 mW), AUTO-BW

Instead of AUTO-BW here, can you follow the examples from TW and US of
expanding the previous band by 5 MHz? That should cover the 160 MHz
channel.


ChenYu

> +       (5945 - 6425 @ 320), (250 mW), NO-OUTDOOR
> +       (57000 - 66000 @ 2160), (10000 mW)
>
>  # SI as part of EU/CEPT accepted decisions 2005/513/EC (5GHz RLAN, EN 30=
1 893)
>  # and 2006/771/EC (amended by 2008/432/EC, Short-Range Devices, EN 300 4=
40)
> --
> 2.41.0
>
>
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