From: Michael Wu <flamingice@sourmilk.net>
To: Andy Green <andy@warmcat.com>
Subject: Re: Faking powersave for fun and realtime channel muxing
Date: Mon, 19 Mar 2007 16:38:43 -0400
Cc: linux-wireless@vger.kernel.org
References: <45FEEB34.1000403@warmcat.com>
In-Reply-To: <45FEEB34.1000403@warmcat.com>
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On Monday 19 March 2007 15:57, Andy Green wrote:
> Hi folks -
>
> If you could generate and manage powersave protocol frames to an AP from
> the mac80211 stack, without actually putting the radio to sleep, you
> could do some interesting things.
>
Like in my scanning patch series?

http://news.gmane.org/find-root.php?group=3Dgmane.linux.kernel.wireless.gen=
eral&article=3D770

This requires a bit of kernel side support to queue up frames on the client=
=20
side to maintain the illusion that nothing happened. (except for a brief=20
latency jump) However, it does seem to work for the wireless cards I've=20
tested. Doing scanning like this in userspace will require some sort of=20
interface to stop/restart the TX for the appropriate network interfaces, bu=
t=20
will probably make your multichannel association idea possible.

As for how long the AP will hold your frames.. 802.11 defines a minimum tim=
e,=20
but the maximum depends on the AP.

=2DMichael Wu

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