[opendtv] Re: TV Technology:

From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
Date: Wed, 1 Feb 2017 00:34:39 +0000

Ron Economos wrote:

Sorry, I still don't know what you're talking about. How exactly do
you share the spectrum? Please be specific, the devil is in the details.

Same as OTA TV does. You can share spectrum in cellular communications by
establishing a standard that all cellular services must use, and then let them
compete as services, on the standard medium.

This is exactly how the Internet evolved too. Looking towards individual homes,
the ISPs competed by using an existing standard, POTS and modems at the
physical and data link layers, IP up from that, that everyone has at easy
disposal. The cellco's role COULD HAVE BEEN equated to that of the original
wired ISPs.

I'm well aware that this is not how cellular evolved here in the US. But for
example, in principle, this approach COULD be adopted, beginning with LTE/4G.
It is not being adopted, but it could be.

The original rationale used, "to promote innovation," became rather lame by 3G.
All systems adopted CDMA for 3G, but oh by the way, incompatible schemes. Which
meant still you could not share spectrum efficiently. But by the time 4G rolled
around, and it looks like possibly 5G too, these RF standards had become
complex enough that everyone collaborates now, in their development. And yet,
in the US, the inefficient approach continues regardless.

By the way, a standard approach saves spectrum for the same reason that
statistical multiplexing saves spectrum. If a cell is briefly experiencing
heavy demand from cellco A subscribers, chances are that the other cellco
subscribers are not at peak demand, at exactly the same time, in exactly the
same cell. If these cellcos must have different frequency channels assigned to
them, then each one has to worry about provisioning for peak demand. Wasteful!

It sounds like you're talking about about smart radios,

Only if you assume that the way cellular service evolved here is the only way
it could have evolved. Yes, smart radios could be used, e.g. to allow a cell
phone to use either the cdma2000 scheme used by Verizon or the WDCMA scheme
used by AT&T, for 3G. But this is just because we went the hard route.

In short, the way OTA TV spectrum is used is inherently a lot more efficient
than the way cellular spectrum is used, keeping in mind that OTA TV broadcast
must cover very large areas with the same signal. If OTA spectrum had been
duplicated for every different TV set manufacturer, or for every different OTA
"spectrum utility," *that* would be equivalent to how cellular is deployed in
the US.

Bert

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