[PATCH v2] wireless-regdb: Update regulatory rules for Sri Lanka (LK)

[Mohamed Aashif]

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 with DFS
- 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)

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).

Signed-off-by: Mohamed Aashif <maashif011 at gmail.com>
---
Thanks for the review and catching the TPC and ETSI standard details!

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..12cdafd 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 - Wideband Data Transmission
+country LK: DFS-ETSI
+	(2400 - 2483.5 @ 40), (23)
+	(5150 - 5250 @ 80), (23), DFS, 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