Date: Sun, 29 Apr 2012 15:46:39 +0200 From: Bernhard Schmidt <bschmidt@freebsd.org> To: Lev Serebryakov <lev@freebsd.org> Cc: freebsd-wireless@freebsd.org Subject: Re: AP automatic channel selection? Message-ID: <CAAgh0_aMR5smqJKRXL=Cz%2Bj5MAkREyzHj3sruhOgxU=6CgQ9mA@mail.gmail.com> In-Reply-To: <665189217.20120429172958@serebryakov.spb.ru> References: <665189217.20120429172958@serebryakov.spb.ru>
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On Sun, Apr 29, 2012 at 15:29, Lev Serebryakov <lev@freebsd.org> wrote: > Hello, Freebsd-wireless. > > Is it possible to implement automatic channel selection by AP, with > ath driver? > > Some SOHO routers have such functionality. > > I mean, that card could monitor channels activity like new > "athsurvey" tool does, say, one per minute, and switch to channel > which was least busy for, say, last 10 minutes. It should not switch > more often tan same 10 minutes (all configurable) in any case. > > It seems, that in my environment, channels' occupation depends on > time of day very much, and what is good for morning is not so good > for night. Those APs I know which do auto channel selection scan all channels once and select one where the least traffic has been seen. This is a one time thing, before bringing up the AP itself, as monitoring once a channel has been brought up is close to impossible. To do so, the hardware would have to switch to another channel, check what's going one and switch back to the service channel. While this happens no clients can be served because the hardware is obviously not on the service channel. This has been seen as to disruptive for anyone who thought about implementing such a feature. I'm not to familiar with the survey tool, but I guess it does also have to switch channels. If you don't care about your clients loosing connection for a bit, you could obviously stop the AP, do a scan (or use the survey tool) and based on the results select another channel before bringing up the AP again. I'm not aware that anyone has done something like that already, though, writing a script doing just that shouldn't be too hard. -- Bernhard
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