[Starlink] [Cake] [Make-wifi-fast] [Cerowrt-devel] Due Aug 2: Internet Quality workshop CFP for the internet architecture board

Bob McMahon bob.mcmahon at broadcom.com
Sun Aug 8 01:15:35 EDT 2021


We have hundreds of test rigs in multiple labs all over geography. Each rig
is shielded from the others using things like RF enclosures. We want
reproducibility in the RF paths/channels as well as variability. Most have
built fixed rigs using conducted equipment. This is far from anything real.
A butler matrix produces great condition numbers but that makes it too easy
for MIMO rate selection algorithms.

Our real world test is using a real house that has been rented. Not cheap
nor scalable.

There is quite a gap between the two. A RF path device that supports both
variable range and variable mixing is a step towards closing the gap.

Bob

On Sat, Aug 7, 2021 at 10:07 PM Dick Roy <dickroy at alum.mit.edu> wrote:

>
>
>
> ------------------------------
>
> *From:* Starlink [mailto:starlink-bounces at lists.bufferbloat.net] *On
> Behalf Of *Bob McMahon
> *Sent:* Monday, August 2, 2021 6:24 PM
> *To:* Leonard Kleinrock
> *Cc:* starlink at lists.bufferbloat.net; Make-Wifi-fast; Cake List;
> codel at lists.bufferbloat.net; cerowrt-devel; bloat
> *Subject:* Re: [Starlink] [Cake] [Make-wifi-fast] [Cerowrt-devel] Due Aug
> 2: Internet Quality workshop CFP for the internet architecture board
>
>
>
> I found the following talk relevant to distances between all the nodes.
> https://www.youtube.com/watch?v=PNoUcQTCxiM
>
> Distance is an abstract idea but applies to energy into a node as well as
> phylogenetic trees. It's the same problem, i.e. fitting a distance matrix
> using some sort of tree. I've found the five branch tree works well for
> four nodes.
>
> *[RR] These trees are means for approximating a higher dimensional
> real-world problem with a lower dimensional structure.  You may be doing
> this to save hardware when trying to cable up some complex test scenarios,
> however I’m wondering why?  Why not just put the STAs in the lab and turn
> them on rather than cabling them?*
>
>
>
> Bob
>
>
>
> On Mon, Aug 2, 2021 at 5:37 PM Leonard Kleinrock <lk at cs.ucla.edu> wrote:
>
> These cases are what my student, Fouad Tobagi and I called the Hidden
> Terminal Problem (with the Busy Tone solution) back in 1975.
>
> Len
>
>
> > On Aug 2, 2021, at 4:16 PM, David Lang <david at lang.hm> wrote:
> >
> > If you are going to setup a test environment for wifi, you need to
> include the ability to make a fe cases that only happen with RF, not with
> wired networks and are commonly overlooked
> >
> > 1. station A can hear station B and C but they cannot hear each other
> > 2. station A can hear station B but station B cannot hear station A 3.
> station A can hear that station B is transmitting, but not with a strong
> enough signal to decode the signal (yes in theory you can work around
> interference, but in practice interference is still a real thing)
> >
> > David Lang
> >
>
>
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