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Thu, 16 Apr 2026 07:18:01 -0700 (PDT) Received: from bazzite ([102.128.175.252]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-488f5813954sm51737345e9.3.2026.04.16.07.17.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Apr 2026 07:18:00 -0700 (PDT) From: Louis Kotze To: wens@kernel.org Cc: wireless-regdb@lists.infradead.org, Valeriy Kosikhin , Louis Kotze Subject: Re: [PATCH 3/5] wireless-regdb: Fix 6 GHz LPI power for Russia (RU) Date: Thu, 16 Apr 2026 16:17:49 +0200 Message-ID: <20260417060000.ru-analysis@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: References: <20260411222155.299441-4-loukot@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260416_071803_596920_227B5138 X-CRM114-Status: GOOD ( 13.83 ) X-BeenThere: wireless-regdb@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "wireless-regdb" Errors-To: wireless-regdb-bounces+wireless-regdb=archiver.kernel.org@lists.infradead.org On Mon, 13 Apr 2026 at 07:03, Chen-Yu Tsai 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