![]() ![]() ![]() The coefficient of of 2 reflects the way power in “far-field” radiation decreases as the square of distance from the antenna. (busy time - tx time) / (active time - tx time) * 2^(chan_nf - band_min_nf) The interference factor is defined as the ratio of the observed busy time over the time we spent on the channel, this value is then amplified by the noise floor observed on the channel in comparison to the lowest noise floor observed on the entire band. The survey algorithm relies on these values to build an interference factor to give a sense of how much interference was detected on the channel and then picks the channel with the lowest interference factor. The tx time is the amount of time the radio has spent on the channel transmitting data. The busy time consists of the amount of time the radio has spent on the channel but noticed the channel was busy and could not initiate communication if it wanted to. The active time consists of the amount of time the radio has spent on the channel. The survey based algorithm relies on the nl80211 survey API command to query the interface for channel active time, channel busy time, channel tx time and noise. ![]()
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