automatic rate adaptation

Eduard GV eduardgv
Fri Jul 29 04:31:52 PDT 2005

Thanks Jouni,

but could you explain the details of the mechanism? Or is there any
reference you could point me to?

I mean, how is it handled? For example, does it count lost ACKs (after
S consecutive ACKed frames the rate is increased and after E
consecutive lost ACKs rate is lowered), does it use any timer, etc.?

Thank you again.

On 7/29/05, Jouni Malinen 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.
> --

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