So in a nutshell, transmitter sharing by large carriers.
Here in Silicon Valley, the conversion to LTE is pretty dramatic. I only
see 3G signals on the original 800 MHz band. On the 700 MHz, PCS and AWS
bands, it's all LTE (with big 20 MHz nodes on PCS and AWS).
Ron
On 01/31/2017 04:34 PM, Manfredi, Albert E wrote:
Ron Economos wrote:
Sorry, I still don't know what you're talking about. How exactly doSame as OTA TV does. You can share spectrum in cellular communications by
you share the spectrum? Please be specific, the devil is in the details.
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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