On Wed, Jun 30, 2004 at 04:26:50PM +0800, ???? wrote:
> HI!
> I'm working on the 802.11 linux driver now, to improve the quality of
> handoff.I have some question about the scan (probe) procedure.
> I want to begin probe earlier before the link quality is too bad, so can I
> 1??control the new probe to start? maybe I should use the IO-ctl of
> SIOCSIWSCAN.
This is worth a try. This will do a scan, but does not
guarantee that the card will associate with another AP. I belive some
card will only returned cached results in this case and not initiate a
scan. But, in some cases it might work.
Note that some card have control over the handoff, like the
Orinoco driver that use the AP-Density (mapped to the sensitivity).
> but where to stop the old scan procedure?
Which "old" scan procedure ? Scanning is exclusive, and you
can do only one scan at a time.
> 2??Now the driver start probe for several times,but I can't find the
> code in driver.is it done at the lowwer firmware level and should i modify
> this?
Good luck trying to modify the firmware.
> 3??after probe ,the card decide to handoff.is this decision done in
> firmware or in software driver? can i control it?
Firmware for most cards, but for some cards it's in the driver.
> thanks !
>
> Guo Jia
Jean
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