en:users:documentation:acs
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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en:users:documentation:acs [2015/05/15 09:49] Rafał Miłecki [Driver implementation details] Fix typo in RX time enums |
en:users:documentation:acs [2018/02/12 08:19] Chaitanya T K Fix typo in the heading |
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| ===== Survey based algorithm ===== | ===== Survey based algorithm ===== | ||
| - | 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. The active time consists of the amount of time the radio has spent on the channel. The busy time consists of the amount of time the channel has spent on the channel but noticed the channel was busy and could not initiate communication if it wanted to. The tx time is the amount of time the channel has spent on the channel transmitting data. 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 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. The active time consists of the amount of time the radio has spent on the channel. 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 tx time is the amount of time the radio has spent on the channel transmitting data. 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 //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 //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. | ||
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| - | ===== Example survet-based ACS analysis printout from hostapd ===== | + | ===== Example survey-based ACS analysis printout from hostapd ===== |
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| Only the following drivers support the current (2014-08-19) survey based ACS implmenetation in hostapd ([[http://w1.fi/cgit/hostap/tree/hostapd/defconfig#n309|http://w1.fi/cgit/hostap/tree/hostapd/defconfig#n309]]). | Only the following drivers support the current (2014-08-19) survey based ACS implmenetation in hostapd ([[http://w1.fi/cgit/hostap/tree/hostapd/defconfig#n309|http://w1.fi/cgit/hostap/tree/hostapd/defconfig#n309]]). | ||
| * ath5k | * ath5k | ||
| - | * ath9k | + | * ath9k (The pcie version only) |
| * ath10k When building make sure you enable ACS in hostapd's .config file: | * ath10k When building make sure you enable ACS in hostapd's .config file: | ||
en/users/documentation/acs.txt · Last modified: 2021/03/01 04:28 by Nikolas Nyby
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