From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mx2.suse.de ([195.135.220.15]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1atHuf-0005lG-VF for wireless-regdb@lists.infradead.org; Thu, 21 Apr 2016 16:57:10 +0000 Date: Thu, 21 Apr 2016 18:56:45 +0200 From: "Luis R. Rodriguez" Message-ID: <20160421165645.GW1990@wotan.suse.de> References: <1461113043-30102-1-git-send-email-bordjukov@gmail.com> <20160421140721.GB95003@ubuntu-hedt> <87fuuf54ai.wl-bordjukov@gmail.com> <20160421163410.GC95003@ubuntu-hedt> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20160421163410.GC95003@ubuntu-hedt> Subject: Re: [wireless-regdb] Updates for the regulatory rules for Bulgaria List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Sender: "wireless-regdb" Errors-To: wireless-regdb-bounces+johannes=sipsolutions.net@lists.infradead.org Content-Transfer-Encoding: 8bit To: Seth Forshee Cc: Petko Bordjukov , wireless-regdb@lists.infradead.org List-ID: On Thu, Apr 21, 2016 at 11:34:10AM -0500, Seth Forshee wrote: > On Thu, Apr 21, 2016 at 07:12:53PM +0300, Petko Bordjukov wrote: > > On Thu, 21 Apr 2016 17:07:21 +0300, > > Seth Forshee wrote: > > > This is almost certainly because these frequencies require transmit > > > power control. We drop the TX power limits by half (i.e. 3 dB) when TPC > > > is required on account of not supporting TPC. > > > > I was under the impression that the underlying kernel infrastructure had support > > for TPC. What I am observing is that hostapd automatically includes the Power > > Constraint IE in beacons sent out on any channel with DFS enabled. The default > > transmit power reduction is 3dBm. > > > > This means that the TX power of any clients would be limited to 3dBm below the > > TX power of the AP even though it's not required. > > > > Would there be any merit in providing additional information regarding the TX > > power and the target average TX power reduction for the system when TPC is > > supported? > > I'm frankly not certain about the status of kernel support, but my > impression was that some drivers might have some level of TPC support > but that it's not universal. I really haven't been keeping track of it > though. When I looked at adding support for Linux, IIRC the status of affairs was that it was complex, and iffy, and no one ever really implemented it even on Windows / OSX so the adjustments were easier to make so that's what people did. Luis _______________________________________________ wireless-regdb mailing list wireless-regdb@lists.infradead.org http://lists.infradead.org/mailman/listinfo/wireless-regdb