On Sun, 2014-08-24 at 12:08 +0200, Steinar H. Gunderson wrote: > Linux already supports 802.11h, where the access point can tell the > client to reduce its transmission power. However, 802.11h is only > defined for 5 GHz, where the need for this is much smaller than on > 2.4 GHz. > > Cisco has their own solution, called DTPC (Dynamic Transmit Power > Control). Cisco APs on a controller sometimes but not always send > 802.11h; they always send DTPC, even on 2.4 GHz. This patch adds support > for parsing and honoring the DTPC IE if there is no 802.11h element; > the format is not documented, but very simple. > > Tested (on top of wireless.git and on 3.16.1) against a Cisco Aironet > 1142 joined to a Cisco 2504 WLC, by setting various transmit power > levels for the given access points and observing the results. > The Wireshark 802.11 dissector agrees with the interpretation of the > element, except for negative numbers, which seem to never happen > anyway. Can you say *why* we want this? Does it yield better behaviour on a Cisco deployment? johannes -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
