Re: [Tm-rid] Review of draft-drip-arch-02 w.r.t. RFC6973, RFC8280 and other

[Alexandre Petrescu <[e-mail]>]

Hi, Bob,

Le 08/07/2020 à 17:39, Robert Moskowitz a écrit :
[...]
> So you either have LTE/5G, perhaps a private addressing/slice.

Interesting.

Loon did put, apparently, 4G base stations in high altitude balloons, in
South America.  These could be used to talk to flying devices including
UAM vehicles and such multicopters.

ESA (European Space Agency) does pursue actively 5G plans.

However, there could be doubts about the whole concept of using 5G in a
UAM vehicle (flying taxi) for simple reaons such as antenna placement,
orientation and coverage.

> Or something down-frequency like 500 - 900 MHz like IEEE 802.16
> (note the work being done on the PHYs there in TG 802.15.16t).

Interesting.

An 802.15.* PAN (Personal) proposed at UHF and VHF hundred km ranges
sounds so.

In such a frequency range, one could also think about DVB-T
modifications (Digital Video Broadcast - Terrestrial).  The
flightradar24.com tracks regular airline flights also by proposing a
DVB-T USB key that enthusiasts could help with.

These dongles receive presence data from these planes.
https://www.flightradar24.com/build-your-own

They call it "ADS-B Receivers" (Automatic Dependent Surveillance -
Broadcast).

I wouuld like to ask if there is a packet dump available showing such
presence data form planes?  Maybe wireshark already supports it, maybe
it even dissects it.

Maybe this 802.15.16t Licensed narrowband for mission critical entities
would compete with that ADS-B concept.

At that point, one could think about using IP-over-ADS, or
IP-over-802-15-16t, and so there could be a resolution.

> So I see more of a money fight between the 3GPP cellular companies 
> and the private spectrum companies.
> 
> The private spectrum companies have a very strong case for managing 
> who uses their spectrum and maintaining the 'mission critical' 
> communication.  Do check out:
> 
> http://www.ieee802.org/15/pub/TG16t.html
> 
> Some of these frequencies have very good characteristics for this 
> application.
> 
> For UAM, it SHOULD be an IP link, but if they go Sat, all bets are 
> off, depending on the Sat company.

Sattelite communications for UAM vehicles such as flying taxis could
indeed be useful, even though it might increase their cost.

But, if it is an IP link, I suspect I must look closer at the DRIP
message formats and see whether they could be transmitted on these IP links.

Finally, as you might notice, I might have an interest for UAM
vehicles such as manned-but-not-in-control air taxis (VoloCopter, Geely,
Lilium, Kitty Hawk, Ehang, Link&Fly, Kitty Hawk Cora, Cezeri, Hyundai
Uber flying taxi at CES 2020), and for broadcasting over IP their
presence information.  This is a little bit different than DNS and
presence advertisement over the Internet, even though it is on IP.  I
will have to read the drafts of DRIP.

Alex

> 
> Bob
>