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From: Felix Fietkau <nbd@openwrt.org>
To: Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de>
Cc: linux-wireless@vger.kernel.org,
	Johannes Berg <johannes@sipsolutions.net>,
	Mathias Kretschmer <mathias.kretschmer@fokus.fraunhofer.de>,
	Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Subject: Re: [PATCHv3 08/18] cfg80211/mac80211: use reduced txpower for 5 and 10 MHz
Date: Thu, 16 May 2013 13:49:32 +0200	[thread overview]
Message-ID: <5194C7CC.1090109@openwrt.org> (raw)
In-Reply-To: <1368702045-27598-9-git-send-email-siwu@hrz.tu-chemnitz.de>

On 2013-05-16 1:00 PM, Simon Wunderlich wrote:
> Some regulations (like germany, but also FCC) express their transmission
> power limit in dBm/MHz or mW/MHz. To cope with that and be on the safe
> side, reduce the maximum power to half (10 MHz) or quarter (5 MHz)
> when operating on these reduced bandwidth channels.
As far as I know, chan->max_power can in some cases contain the hardware
limit instead of the regulatory limit. It's safer to check
chan->max_reg_power to see if a reduction is necessary.

- Felix


  reply	other threads:[~2013-05-16 11:49 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-16 11:00 [PATCHv3 00/18] Add support for 5 and 10 MHz channels Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 01/18] nl80211/cfg80211: add 5 and 10 MHz defines and wiphy flag Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 02/18] nl80211: add rate flags for 5/10 Mhz channels Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 03/18] mac80211: Fix rate control mask matching call Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 04/18] mac80211: fix various components for the new 5 and 10 MHz widths Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 05/18] mac80211: fix timing for 5 MHz and 10 MHz channels Simon Wunderlich
2013-06-18 14:21   ` Johannes Berg
2013-06-18 16:27     ` Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 06/18] mac80211: select and adjust bitrates according for channel mode Simon Wunderlich
2013-06-18 14:25   ` Johannes Berg
2013-05-16 11:00 ` [PATCHv3 07/18] mac80211: add radiotap flag and handling for 5/10 MHz Simon Wunderlich
2013-06-18 14:27   ` Johannes Berg
2013-06-18 15:50     ` Simon Wunderlich
2013-06-18 15:53       ` Johannes Berg
2013-05-16 11:00 ` [PATCHv3 08/18] cfg80211/mac80211: use reduced txpower for 5 and 10 MHz Simon Wunderlich
2013-05-16 11:49   ` Felix Fietkau [this message]
2013-05-16 11:00 ` [PATCHv3 09/18] mac80211: change IBSS channel state to chandef Simon Wunderlich
2013-06-18 14:28   ` Johannes Berg
2013-08-21  9:35   ` Johannes Berg
2013-05-16 11:00 ` [PATCHv3 10/18] nl80211: allow 5 and 10 MHz channels for IBSS Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 11/18] ath9k: always use SIFS times from OFDM for 5/10 MHz Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 12/18] ath9k: use chandef instead of channel_type Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 13/18] ath9k: report 5/10 MHz channels Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 14/18] ath9k: set 5/10 MHz supported channels and fix bitrate Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 15/18] ath9k: announce that ath9k supports 5/10 MHz Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 16/18] ath5k: report 5/10 MHz channels Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 17/18] ath5k: set 5/10 MHz supported channels and fix duration Simon Wunderlich
2013-05-16 11:00 ` [PATCHv3 18/18] ath5k: enable support for 5 MHz and 10 MHz channels Simon Wunderlich
2013-05-28 10:41 ` [PATCHv3 00/18] Add support for 5 " Simon Wunderlich

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