[PATCH 3/5] wireless-regdb: Fix 6 GHz LPI power for Russia (RU)

[Louis Kotze]

On Mon, 13 Apr 2026 at 07:03, Chen-Yu Tsai <wens at kernel.org> wrote:
> This page doesn't actually contain any useful information.

You are right — the eleoscompliance.com reference was a secondary
source and not useful. I have since obtained the primary SCRF
documents (shared by Valeriy Kosikhin) and verified them directly.

> I did find https://www.gccorp.com.tw/en/?p=2173 using the document
> name you gave, but that also mentions that "automatic power control
> system" is required. I assume that is TPC, which Linux basically
> doesn't have. So we still have a problem here. If the rules were
> based on FCC or EU regulations, then we sort of adopt a 3 dBm
> reduction in the limit.

The TPC concern is resolved. SCRF Decision 23-68-03 (September 27,
2023) replaced the phrase "With the use of an automatic power
control system" with "With the use of LBT mode" across all entries
in Annex 2 of SCRF 07-20-03-001. This is a literal text
substitution (clause 3.1 of 23-68-03). There is no TPC requirement
in the current SCRF allocation, so the -3 dBm reduction does not
apply here.

LBT as required by ETSI is satisfied by standard 802.11 CCA (Clear
Channel Assessment) — the mandatory listen-before-transmit mechanism
in the 802.11 MAC layer. ETSI EN 301 893 clause 4.8 establishes
this for 5 GHz RLAN, and EN 303 687 for 6 GHz. Linux mac80211
implements CCA in the standard transmit path.

(The SCRF text actually says "LBT2 mode" — Valeriy traced this to a
clerical error where a footnote marker "2" was merged into the term
during a copy-paste between SCRF decisions 21-60 and 23-68-03. There
is no "LBT2" in any technical standard. He has reported the error to
the SCRF.)

Verified SCRF allocation values (from primary PDFs):

  2400-2483.5 MHz: 100 mW EIRP, no restriction
  5150-5350 MHz:   200 mW EIRP, indoor, LBT
  5650-5850 MHz:   200 mW EIRP, indoor, LBT
  5925-6425 MHz:   200 mW EIRP (LPI), indoor, LBT
  57-66 GHz:       40 dBm EIRP, indoor

The current db.txt has 100 mW for all three 5/6 GHz bands. The SCRF
allocation shows 200 mW. For 5650-5850 and 5925-6425, all applicable
Russian regulations agree on 200 mW — these entries do not reflect
the current regulatory limits.

For 5150-5350, there is a complication: the SCRF allocation says
200 mW, but the equipment certification rules (per-standard Orders)
cap power at 100 mW for 802.11n (Order 124) and 802.11ax (Order
321). Only 802.11ac (Order 129) allows 200 mW with TPC.

This raises a question I would appreciate your guidance on:

When a country has separate spectrum allocation (200 mW) and
per-standard equipment certification rules (100 mW for most
standards), should the regdb encode the spectrum allocation ceiling
or the most restrictive equipment limit? The ETSI model puts both
values in the same standard (EN 301 893: 23 dBm with TPC, 20 dBm
without), but Russia has them in different bodies of law.

Full source URLs are in Valeriy's reply in this thread. My v1 was
incomplete — it only addressed 5925-6425 and used an inadequate
reference. Valeriy is preparing a comprehensive update with lawyer
review. We are coordinating on the scope of a v2.

Louis