RE: ath10k: What will happens when radar is detected ?

["voncken" <cedric.voncken@acksys.fr>]

> -----Message d'origine-----
> De : Michal Kazior [mailto:michal.kazior@tieto.com]
> Envoyé : mardi 24 mars 2015 07:56
> À : Cedric VONCKEN
> Cc : linux-wireless
> Objet : Re: ath10k: What will happens when radar is detected ?
> 
> On 23 March 2015 at 16:16, Cedric VONCKEN <cedric.voncken@acksys.fr>
> wrote:
> > In 802.11ac standard, it is possible to dynamically reduce the channel
> > width used.
> > My question is:
> >         If I use a channel with 80 or 40 MHz width, what will happen
> > if I detect radar?
> >                 The ath10k card/driver reduces automatically the
> > channel width.
> 
> Currently entire chandef occupied will be marked as unavailable and AP
> will stop/switch to a different non-overlapping chandef via CSA.
Thanks for your answer.
> 
> I guess it should be possible to implement what you suggest, i.e.
> change only chandef width when radar is narrow and located at a suitable
> part of the chandef. This would require hw to be capable of detecting
> radar center freq and width accurately. I'm not sure if QCA988X is
> capable of that although firmware interface seems to be able to carry
> this kind of information already.
> 
> I wonder why would you want this behaviour in the first place?
> Wouldn't this actually end up with having less bandwidth and lower
> throughput (which is already penalized when radar detection is active)?
In an industrial environment we prefer to reduce the throughput but keep the link without gap. I think it can be a parameter in AP software for example.

Cédric