[Battlemesh] Questions for a weather radar specialist?

[Benjamin Henrion]

On Monday, November 4, 2019, Linus Lüssing <linus.luessing at c0d3.blue> wrote:

> Oh, what a coincidence I was in Vienna this weekend and
> my train back to Germany leaves in 1.5 hours :D.
>
>
> Questions I'd have would basically be related to the DFS related
> topics and discussions we regularly had at the Battlemesh:
>
> * Are they aware that we would like to use those 5GHz frequencies
>   for meshing but that on-demand channel switching triggered by
>   DFS will break our connectivity/networks? And with only using the 2.4GHz


You mostly cannot change the channel on adhoc mode, as changing it at one
location forces you to update it on all the nodes.

In babel diversity (multi-channels) discussions, we had the idea of some
third radio that would sense the air and negoriate which would be the best
radio channel to pick depending on the air usage. Some APs do this and ask
their clients to relocate to another frequency, but they can do it in a
master-slave setup, not in an adhoc setup.


>   band for adhoc-meshing we are kind of limited in the quality and
>   throughput we can achieve. And the 5GHz point-to-(multi-)point
>   links with stock firmwares workaround is not really satisfactory
>   for an adhoc, on-demand, dynamic meshing goal. Do they have any idea
>   on how this could be solved in the future?
> * What are their thoughts on enforcing regulatory demands via
>   locked-down, signed firmwares? Are they aware of the
>   difficulties with this for community networks?


I participated in this European Commission public consultation, but I don't
know what came out of it. I guess, like in the US, expert views will be
ignored.


> * Do they have any ideas on how we could improve the open-source
>   DFS implementation in the Linux kernel? Not just from a
>   technical perspective, but maybe even organizational point of
>   view, between regulators, weather radar operators and Linux
>   kernel developers.
>
> Cheers, Linus
>
>
> On Sat, Nov 02, 2019 at 12:20:06AM +0100, Albert Rafetseder wrote:
> > Hello Battlemeshers,
> >
> > TL;DR: Send us questions about weather radars, we (FunkFeuer Vienna)
> > will host a specialist this coming Monday [1].
> >
> > Long version: A month ago, the Austrian radio authority contacted us.
> > One of our community network nodes, a 5 GHz Ubiquiti device, happened to
> > interfere with the weather radar at the local airport [2].
> >
> > We solved the problem, and got forwarded to the company that operates
> > the weather radar (and also controls the Austrian airspace.) They are
> > interested to share their view of the world and the spectrum in
> > particular. We are interested to maintain good neighborly relations.
> >
> > Thus, a weather radar specialist of theirs will visit us on Monday
> > during our regular community get-together and will be available for Q&A.
> >
> > So, if there is anything you want to know about weather radars, please
> > contribute to our pad [1]. We will add notes during the meeting and send
> > a summary via this list if you wish.
> >
> > Cheers,
> >   Albert.
> >
> > [0] Add your questions here:
> > https://pads.c3w.at/pad/#/2/pad/edit/o-cEflXwKLSYXyz5OlaTIaPB/
> > [1] Mail thread in German, ping me for a translation.
> > https://lists.funkfeuer.at/pipermail/wien/2019-October/013238.html
> > _______________________________________________
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> > Battlemesh at ml.ninux.org
> > https://ml.ninux.org/mailman/listinfo/battlemesh
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-- 
Benjamin Henrion (zoobab)
Email: zoobab at gmail.com
Mobile: +32-484-566109
Web: http://www.zoobab.com
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