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README.dfs
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@ -1,8 +1,14 @@
2007-10-11 Benoit PAPILLAULT <benoit.papillault@free.fr>
Conformance testing to the following standards:
* ETSI 301 893 v1.3.1
* 802.11h
* ETSI 301 893 v1.4.1 (dated 2007-07)
* FCC
* IEEE 802.11h-2003 (dated 2003-10-14)
ETSI and FCC defines the regulation constraints and defines several roles :
* "master"
* "slave without radar detection"
* "slave with radar detection"
Frequencies & channels where DFS is applicable:
* ETSI : 5250-5350MHz , 5470-5725MHz
@ -18,3 +24,29 @@ echo "<tsf> <rssi> <width>" > /proc/sys/dev/wifi0/radar_pulse
Simulating a radar detected event:
iwpriv wlan0 doth_radar
== Notes on DFS in various modes ==
A VAP interface can be used in several modes:
* IEEE80211_M_STA "sta" : DFS is implemented as "slave"
* IEEE80211_M_IBSS "adhoc" : DFS is implemented as "master"
* IEEE80211_M_AHDEMO "ahdemo" : DFS is implemented as "master"
* IEEE80211_M_HOSTAP "ap" : DFS is implemented as "master"
* IEEE80211_M_MONITOR "monitor" : DFS is not implemented
* IEEE80211_M_WDS "wds" : DFS is implemented as "master"
== Implementation notes ==
sc->sc_curchan.privFlags & CHANNEL_DFS is set if ETSI/FCC compliance is
required by regulation. It does not mean that 802.11h is required. This flag
is automatically adjusted by ath_radar_correct_dfs_flags() according to the
regulation for the specified frequency.
ic->ic_flags & IEEE80211_F_DOTH is set if IEEE 802.11h is required. It matches
dot11SpectrumManagementRequired as described in IEEE 802.11h. Default value is
1 and can be changed at anytime by the user through iwpriv.
ETSI/FCC mechanisms (Channel Availability Check, In-Service Monitoring, Channel
Shutdown, Non-Occupancy Period) and IEEE 802.11h magnums (Selecting and
advertising a new channel, ...) are implemented ONLY if both flags are set.