automatic rate adaptation

sunny sunny sunny.tired at gmail.com
Thu Aug 4 16:19:27 EDT 2005


Hi Jouni,

- quote 
 the driver can override the TX rate selection on packet-by-packet basis.
- quote 

If I have to do this, do I have to modify the hostAP driver or just
make a raw socket with prism 2 header ?

I am currently doing a "iwpriv txpower set" to do this. But would be
interested to know a faster/better implementation.

Any pointers would be helpful. 

Thanks.
Santosh.

On 7/28/05, Jouni Malinen <jkmaline at cc.hut.fi> wrote:
> On Thu, Jul 28, 2005 at 04:45:30PM +0200, Eduard GV wrote:
> 
> > I would like to know if prism cards implement any kind of rate
> > adaptation algorithm (change modulation depending on channel
> > conditions).
> >
> > If yes, could you explain the mechanism? is it carried out by the
> > firmware or by hostap driver?
> 
> Yes, station firmware implements a rate control algorithm. In addition,
> the driver can override the TX rate selection on packet-by-packet basis.
> As an example, Host AP driver uses its own algorithm for the Master/Host
> AP mode since firmware implementation is mainly for managed modes.
> 
> --
> Jouni Malinen                                            PGP id EFC895FA
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