[PATCH v3] wireless-regdb: Update 6 GHz rules for South Korea (KR)

[Louis Kotze <loukot@gmail.com>]

MSIT Notification No. 2026-10 (10 February 2026), the technical
standards for wireless equipment that may be opened without
notification, amended the 6 GHz indoor rules for Korea.

Indoor (clause 2.나) PSD limits, including antenna absolute gain
(EIRP-PSD):

  5925-6425 MHz: 5 dBm/MHz, 320 MHz max occupied bandwidth
  6425-7125 MHz: 2 dBm/MHz, 320 MHz max occupied bandwidth

Both ranges are indoor only, restricted to equipment connected to
building power, with mobile use prohibited. The previous combined
entry from MSIT 2024-22 used a single 2 dBm/MHz PSD across the full
5925-7125 MHz range; 2026-10 split the bands and raised the lower
band PSD from 2 to 5 dBm/MHz.

The regdb has no PSD encoding, so the EIRP value is derived from the
PSD limit at the smallest channel width permitted by the regulation
(20 MHz), which is the most restrictive interpretation:

  5925-6425: 5 dBm/MHz × 20 MHz = 18 dBm
  6425-7125: 2 dBm/MHz × 20 MHz = 15 dBm

Split the existing combined rule into two ranges to reflect the
per-band PSD difference, and add AUTO-BW so adjacent ranges combine
at the lower limit. Raise the maximum bandwidth from 160 to 320 MHz
per the explicit "320 MHz 이하" in the regulation.

Reference:
  MSIT Notification No. 2026-10 (10 February 2026)
  Partial amendment to the technical standards for wireless equipment
  for radio stations that may be opened without notification
  https://www.msit.go.kr/bbs/view.do?sCode=user&mId=108&mPid=103&bbsSeqNo=83&nttSeqNo=3186356

Signed-off-by: Louis Kotze <loukot@gmail.com>
---
Changes since v2:
  - Cite the correct source: MSIT 2026-10 (technical standards
    amendment), not 2026-9 (device classification amendment).
  - Replace the v2 power values (30 / 27 dBm) with PSD-derived limits
    at the smallest permitted channel width (20 MHz): 18 / 15 dBm.
    The v2 values were the PSD limit × 320 MHz, which would over-
    radiate narrow channels by up to 12 dB versus the regulation's
    PSD cap. Encoding at the narrowest channel ensures the regdb
    value is PSD-compliant at all permitted widths.
  - Acknowledge the 2024-22 → 2026-10 PSD change explicitly: lower
    band raised from 2 to 5 dBm/MHz, upper band unchanged at 2
    dBm/MHz, indoor only.
  - Use the regulation's wording "PSD including antenna absolute
    gain" (effectively EIRP-PSD) rather than bare "EIRP".

v1: https://lore.kernel.org/wireless-regdb/20260411222155.299441-3-loukot@gmail.com/
v2: https://lore.kernel.org/wireless-regdb/20260416120001.979135-1-loukot@gmail.com/

 db.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/db.txt b/db.txt
index c310b7f..92cf9cc 100644
--- a/db.txt
+++ b/db.txt
@@ -1135,8 +1135,9 @@ country KR: DFS-JP
 	(5250 - 5350 @ 80), (20), DFS, AUTO-BW
 	(5470 - 5725 @ 160), (20), DFS
 	(5725 - 5850 @ 80), (23)
-	# 6 GHz band
-	(5925 - 7125 @ 160), (15), NO-OUTDOOR
+	# 6 GHz band - per MSIT Notice 2026-10
+	(5925 - 6425 @ 320), (18), NO-OUTDOOR, AUTO-BW
+	(6425 - 7125 @ 320), (15), NO-OUTDOOR, AUTO-BW
 	# 60 GHz band channels 1-4
 	(57000 - 66000 @ 2160), (43)
 

base-commit: 0bfb3d418a27cccf313ae64b0ed909f3ad95fea6
-- 
2.54.0