Date: Wed, 4 Dec 2013 11:32:39 +0800 From: Tek Wiz <tx2023@gmail.com> To: Jim Thompson <jim@netgate.com> Cc: "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org> Subject: Re: Channel interference scan and manual selection Message-ID: <CAC6a1Dhuf5AYTYnjo82tO7LL2phBOijS=wTWBdq79NXk6exd5Q@mail.gmail.com> In-Reply-To: <46B1EFC5-1AA4-4E51-B199-D4CDACEEA0AC@netgate.com> References: <CAC6a1Dh_vwAMNucd%2BFBB-3CFKpmW3SCRwBrLZfCv%2BaL5=SoJ2Q@mail.gmail.com> <CAJ-VmonK6zp0tDaeKZatDwu=pr6RKzFC=An5YnVMc3XK1oeNUQ@mail.gmail.com> <CAC6a1DiPrA%2BksO%2BLQu%2BcRgB0jYnz=BcFfMBCmFaiF316OieOxw@mail.gmail.com> <CAJ-VmomMXfPxVJLkvUS4=VDe_oiCNgbXa7Aj=E9QkYHJ=gtUag@mail.gmail.com> <46B1EFC5-1AA4-4E51-B199-D4CDACEEA0AC@netgate.com>
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Yes, the interference can be calculated by averaging the beacon RSSI (dB) of the overlapping channels, e.g. for channel 6, the beacon RSSI of channels 4, 5, 6, 7, 8 are averaged. Normally channels 1, 6, and 11 are chosen, although other channels may have less interference, in order to be a 'good neighbor'. On Wed, Dec 4, 2013 at 11:03 AM, Jim Thompson <jim@netgate.com> wrote: > > On Dec 3, 2013, at 7:56 PM, Adrian Chadd <adrian@freebsd.org> wrote: > > > Now, ideally it'd actually check the channel for interference and > > channel busy status, and use _that_ metric. > > Ideally, it would attempt to get co-channel with other APs on the same > channel. > > Especially in 2.4GHz (or any of the 5GHz bands). > > Because you would *much* rather share the air (via collision avoidance) > than raise the noise floor for someone (everyone) else. > > And, given that everyone has a DC receiver these days, there are NO > =93non-overlapping channels=94. > > jim > >
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