This looked kinda intriguing to me too, and so I did some searching for what feature this is. In particular, it is the Transmit Power Control portion of 802.11h, normally intended for 5GHz: https://en.wikipedia.org/wiki/IEEE_802.11h-2003
It occurs in the function "static u32 ieee80211_handle_pwr_constr()" in the source file net/mac80211/mlme.c. The OpenWRT wiki says the feature "doth" isn't yet supported in mac80211, although I'd be curious if any list members know otherwise. http://wiki.openwrt.org/doc/uci/wireless Similarly, here is patch to support a competing implementation by Cicso (no idea if this is in OpenWRT, either): https://www.mail-archive.com/[email protected]/msg00037.html On Fri, Oct 31, 2014 at 5:00 AM, Holger Adams <[email protected]> wrote: > Hello Everybody, > > I just connected to my university wlan and found following message in > dmesg: > > wlan0: Limiting TX power to 14 dBm as advertised by a0:cf:5b:3f:xx:xx > wlan0: Limiting TX power to 5 dBm as advertised by 64:ae:0c:c5:xx:xx > > Looks like a nice method of (dynamic) interference reduction in crowded > areas. Is there a way in OpenWRT to enable this feature? > > Best regards, > Holger > _______________________________________________ > openwrt-users mailing list > [email protected] > https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-users > -- Ben West http://gowasabi.net [email protected] 314-246-9434
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