[opendtv] Re: On 5G, the United States is building Betamax while China builds VHS
- From: "Craig Birkmaier" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "brewmastercraig" for DMARC)
- To: opendtv@xxxxxxxxxxxxx
- Date: Sun, 21 Apr 2019 08:54:18 -0400
Bert is right to question this article. It ignores the reality that all
existing spectrum bands, currently used for cellular communications, will
CONTINUE to be used in a manner that best exploits the characteristics oof each
frequency band.
On Apr 20, 2019, at 7:13 PM, Manfredi (US), Albert E
<albert.e.manfredi@xxxxxxxxxx> wrote:
Managed to read this before the Wash Post asked for payment. It's clueless,
though. China knows very well that it has to develop mm wave 5G, like
everyone else. The Wash Post, once again going for sensationalism.
Perhaps. The reality is that sub 6 GHz spectrum is easier to exploit than
higher frequencies, as the other articles Bert posted correctly relate. We
already make extensive use of some of the sub 6 GHz bands for WiFi and other
applications.
Sub 6 GHz, what does the Wash Post expect from 5G that 4G can't do equally
well? It becomes that much more mid-band spectrum, whatever the FCC manages
to scare up, that 4G and LTE can put to perfectly good use too. The "longer
range" and "better through walls," touted by this article, comes at a price.
No hint of that, by the Wash Post.
Bert seems to be singing a familiar tune here. I have noted for years that new
technologies, required to introduce 5G services, are equally useful to make
improvements to the 4G services in lower frequency bands. Mimo antennas are a
prime example, increasing frequency reuse within a cell, and significantly
reducing power requirements to operate the cell.
Obviously each band will be used to optimize the service offered, and to
complement other bands that trade off service area for increased data
throughput. This is why even the UHF bands recovered from broadcasters will
continue to be used - these bands offer much greater geographic coverage, which
is just as important in less densely populated areas, as high throughput in
urban areas.
MIMO is already being used in many LTE deployments. ANd beam forming will be a
critical technology for wireless broadband deployments that may exist over a
wide range of frequencies, based on the distance from cells to residential
nodes.
Below 6 GHz will exist here too, but it won't wow anyone. It will be much the
same as AT&T's "5G evolution" is. Any reduction in "latency" will only depend
on the distance to the most distant servers, and can apply to 4G or cabled
broadband as much as 5G. Nor will beam forming be possible, down in the
midband, with practical antennas for consumer oriented gear. Why not find out
the facts first?
Not sure what Bert is referring to as Mid Band. The wired article suggests that
this is where the action will be for 5G for a number of years, until equipment
to support the deployment of tens of thousands of new 5G cells is available.
Bert notes:
https://www.wired.com/story/wired-guide-5g/
"The idea most commonly associated with 5G is millimeter wave technology,
which takes advantage of the very high end of the wireless spectrum, where
there's plenty of unused bandwidth. It's this technology that could enable
those 10 Gbps speeds, but it comes with a huge trade-off."
Yup! Bert did not quote those trade-offs, but distance and interference are the
major issues. In reality it will take years to deploy 5G in the bands above 6
GHz. In the meantime the article tells us:
In the meantime, companies will likely build 5G networks based on other
technologies that are faster than today's networks, but can largely rely on
existing infrastructure.
Regards
Craig
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