[PATCH v3] wireless-regdb: Update regulatory rules for Sri Lanka (LK)

[Chen-Yu Tsai]

On Mon, May 18, 2026 at 3:48 PM Mohamed Aashif <maashif011 at gmail.com> wrote:
>
> Update Sri Lanka regulatory domain based on the RTTE Type Approval
> Rules 2020 from the Telecommunications Regulatory Commission of
> Sri Lanka (TRC).
>
> Source: https://www.trc.gov.lk/content/files/licensing/RTTE_GAZETTE-English.pdf
>
> Key changes:
> - Change DFS region from FCC to ETSI (document references ETSI
>   standards EN 300 328 and EN 301 893 as the applicable radio
>   interface standards)
> - 2.4 GHz: expand to 2400-2483.5 MHz at 23 dBm
> - 5150-5250 MHz: 23 dBm
> - 5250-5350 MHz: 20 dBm with DFS (no TPC, 3 dB reduction per EN 301 893)
> - 5470-5725 MHz: 27 dBm with DFS (no TPC, per EN 301 893)
> - 5725-5875 MHz: 24 dBm with DFS (per ETSI EN 302 502)

The numbers and units should match the official regulations.

The official document you provided uses mW, so please use mW throughout,
unless there are dBm calculations like for the reduction due to no TPC
or adoption of dBm numbers from ETSI rules.

> Note: The TRC gazette conflicts internally by allowing 30 dBm for
> 5725-5875 MHz while citing EN 301 893 (which doesn't cover this band).
> Lacking TRC clarification, we conservatively default to the ETSI
> EN 302 502 limits (24 dBm).

             ^ TPC

Will fix up when applying.

>
> Signed-off-by: Mohamed Aashif <maashif011 at gmail.com>
> ---
> Great, thanks. Removed DFS from 5150-5250 MHz.
>
> Changes in v3:
> - Corrected the table caption in the source comment to "Table 2 - Applicable Standards- Wireless"
> - Removed DFS flag from 5150-5250 MHz
>
> Changes in v2:
> - Split 5150-5350 MHz into 5150-5250 MHz (23 dBm) and 5250-5350 MHz
>   (20 dBm), adding AUTO-BW to both.
> - Applied a 3 dB reduction to 5250-5350 MHz and 5470-5725 MHz (now
>   27 dBm) to comply with ETSI limits since TPC is unsupported.
> - Capped 5725-5875 MHz at 24 dBm per ETSI EN 302 502.
>
>  db.txt | 15 +++++++++------
>  1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/db.txt b/db.txt
> index fdc2c13..8038f5a 100644
> --- a/db.txt
> +++ b/db.txt
> @@ -1058,12 +1058,15 @@ country LI: DFS-ETSI
>         # 60 GHz band channels 1-4 (ETSI EN 302 567)
>         (57000 - 66000 @ 2160), (40)
>
> -country LK: DFS-FCC
> -       (2402 - 2482 @ 40), (20)
> -       (5170 - 5250 @ 20), (17)
> -       (5250 - 5330 @ 20), (24), DFS
> -       (5490 - 5730 @ 20), (24), DFS
> -       (5735 - 5835 @ 20), (30)
> +# Source:
> +# https://www.trc.gov.lk/content/files/licensing/RTTE_GAZETTE-English.pdf
> +# Sri Lanka RTTE Type Approval Rules 2020, Table 2 - Applicable Standards- Wireless
> +country LK: DFS-ETSI
> +       (2400 - 2483.5 @ 40), (23)
> +       (5150 - 5250 @ 80), (23), AUTO-BW
> +       (5250 - 5350 @ 80), (20), DFS, AUTO-BW
> +       (5470 - 5725 @ 160), (27), DFS
> +       (5725 - 5875 @ 80), (24), DFS
>
>  # Source:
>  # http://lca.org.ls/images/documents/lesotho_national_frequency_allocation_plan.pdf
> --
> 2.54.0
>
>