On 07/09/2012 07:55 AM, Johannes Berg wrote:
On Mon, 2012-07-09 at 07:50 -0700, Ben Greear wrote:
On 07/09/2012 01:29 AM, Johannes Berg wrote:
On Sun, 2012-07-08 at 07:34 -0700, Ben Greear wrote:
On 07/08/2012 02:35 AM, Johannes Berg wrote:
From: Johannes Berg <johannes.berg@xxxxxxxxx>
Instead of using full power when scanning, use
full power when off-channel. This is different
since off-channel can be remain-on-channel.
What if we are scanning on our current channel? Shouldn't
it be full-power then as well?
Arguable. If we're on the channel that the AP explicitly told us to use
less power on, and we're not stopping normal traffic, then I'm not sure
we should.
Well, if you are scanning, you might be wanting to find other APs that
perhaps require full power to reach, so it seems to me it should scan
at full power...
Yes, but you're not supposed to send the data packets at the higher
power. So unless you have per-packet power control you'd be breaking
your TPC implementation (which is regulatory relevant) if you do
on-channel scan.
I suppose the other option would be to skip the optimisation in that
case, but ...
I guess I'd rather keep the scan-on-channel optimization and just tx
at lower power. Another thing..with your change, we can skip a hardware
config at the start of scan-on-channel since it was only there to configure
the tx power anyway...
In general, I'd like the ability to choose the tx power on a per-packet
basis so that one virtual station could tx at a different power-setting
than another..but I've no time to work on that now, and I'm not sure hardware
would support that kind of thing anyway.
Thanks,
Ben
johannes
--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc http://www.candelatech.com
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