Harald Welte wrote:
> Mh. Don't recent 802.11 chipsets already have a number of power-saving
> features, even going as far as having special provisions in the 802.11
> protocol for special power saving modes?
They do, but they're still very power-hungry. (Well above 100 mW,
it seems.)
But meanwhile I've been pointed to new technology that should do
a lot better in this regard:
http://www.semiconductors.philips.com/technologies/wirelessconnectivity/80211b/
So maybe active power management from the host would only be
needed for obsolete hardware in the not too distant future.
Still, there's a lot of this around ...
> Sorry for that indefinitive and blurry response, but power saving is the
> about the single part of 802.11 that I'm actually not really interested
> in (and thus haven't read up with the docs).
With a PDA, it's be about the only thing you think about ;-)
> The problem when you just 'stupidly' power down a card is that you will
> loose the association [and thus authentication] with the AP.
Yes, that's what worries me a bit. A few hundred ms of delay
should be fine, but if it takes longer, that might be a problem.
- Werner
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/ Werner Almesberger, Buenos Aires, Argentina wa@xxxxxxxxxxxxxxx /
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