From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from smtp.codeaurora.org ([198.145.29.96]:58544 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751220AbbCZQGH (ORCPT ); Thu, 26 Mar 2015 12:06:07 -0400 From: Kalle Valo To: "Jean-Pierre TOSONI" Cc: Subject: Re: DFS ETSI conformance for weather channels (again) References: <773DB8A82AB6A046AE0195C68612A319019FF0E8@sbs2003.acksys.local> Date: Thu, 26 Mar 2015 18:05:55 +0200 In-Reply-To: <773DB8A82AB6A046AE0195C68612A319019FF0E8@sbs2003.acksys.local> (Jean-Pierre TOSONI's message of "Thu, 26 Mar 2015 11:58:40 +0100") Message-ID: <87619nagm4.fsf@kamboji.qca.qualcomm.com> (sfid-20150326_170611_560310_75AE76DA) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-wireless-owner@vger.kernel.org List-ID: "Jean-Pierre TOSONI" writes: > Hi list, > > I just stumbled on this patch that IMHO was rejected for a bad reason: > > [PATCH v3 4/4] cfg80211: DFS use 10 minutes CAC when weather channels > At http://www.spinics.net/lists/linux-wireless/msg115296.html > > The reason given is the "unachievable" requirement in the ETSI norm of > 99.99% detection success. It was even considered disabling the weather > channels. > > *But the norm (ETSI EN 301 893 V1.7.1) does not say this.* It states > that 99.99% is the target performance: > > - during conformance tests only, (5.3.8.1.1 paragraph 5) > - specifically *not* a requirement with specific real life radars, > (5.3.8.1.1 paragraph 5) > - on a limited series of 20 tests, (5.3.8.2.1.2 item g) > - with a pulse power at +10dB above other pulse detection tests, > (5.3.8.2.1.2 item f) > - with some patterns excluded from the test. (5.3.8.2.1.2 item g) > > Hence it is very possible that existing products can achieve the > conformance test target. > > That being said, would it be possible to reexamine that dropped patch > and apply it? Don't we support this by getting the CAC time in the regulatory database? commit 31559f35c5724976fd975e5d7e90cdb693b8dd27 Author: Janusz Dziedzic Date: Fri Feb 21 19:46:13 2014 +0100 cfg80211: DFS get CAC time from regulatory database Send Channel Availability Check time as a parameter of start_radar_detection() callback. Get CAC time from regulatory database. Signed-off-by: Janusz Dziedzic Signed-off-by: Johannes Berg -- Kalle Valo