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Cellular forums Home > Archive > Cell Phone Tech > July 2007 > how does the U.S keep all the different technoligies from colliding?
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how does the U.S keep all the different technoligies from colliding?
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| B'ichela 2007-07-27, 10:33 pm |
| How does the U.S prevent cellular collisions between CDMA/TDMA
and GSM? Torrington Ct has all 5 providers on the two frequency blocks
of 800/1900. Also is there any plans to add another frequency band
soon? Seems Cingular is saturated with Iphone traffic here. T-mobile
is pretty good quality wise but with the 3 CDMA providers Alltel,
Sprint and Verizon I am confused on how it all is done.
Lastly I am curious. what is 900MHZ and 1600 MHZ used for in
the U.S? these two are the international GSM bands.
I just read that the EU also wants to open their 1600 and 900
bands to competing technology, I know Qualcomm is interested to push
their CDMA there, right now the only CDMA networks in europe is in
some countries at 470mhz. Would europe eventually use 800/1900 for
GSM/CDMA as well?
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B'ichela
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| Dennis Ferguson 2007-07-27, 10:33 pm |
| On 2007-07-27, B'ichela <mdalene@pinkrose.dhis.org> wrote:
> How does the U.S prevent cellular collisions between CDMA/TDMA
> and GSM? Torrington Ct has all 5 providers on the two frequency blocks
> of 800/1900. Also is there any plans to add another frequency band
> soon? Seems Cingular is saturated with Iphone traffic here. T-mobile
> is pretty good quality wise but with the 3 CDMA providers Alltel,
> Sprint and Verizon I am confused on how it all is done.
They are allocated different frequencies within those bands. There
are two allocations in the 800 MHz band and up to (I think) 6, of
various sizes, at 1900 MHz.
> Lastly I am curious. what is 900MHZ and 1600 MHZ used for in
> the U.S? these two are the international GSM bands.
> I just read that the EU also wants to open their 1600 and 900
> bands to competing technology, I know Qualcomm is interested to push
> their CDMA there, right now the only CDMA networks in europe is in
> some countries at 470mhz. Would europe eventually use 800/1900 for
> GSM/CDMA as well?
I think you mean 1800 MHz.
In the US some of the 900 MHz spectrum is occupied by the top of
the 800 MHz band, some is used for an ISM band and some is used by
the government. The upper frequency part of the EU 1800 MHz band
occupies more or less the same spectrum as the lower part of the
US 1900 MHz band. The lower part of the EU 1800 MHz band is occupied
mostly by the 1700 MHz part of the 1700/2100 band which T-Mobile USA
recently purchased for 3G use.
Most Asian countries which have CDMA service use the same frequencies
as the A side of the US 800 MHz band for it, though their GSM services
run at 900 or 1800 MHz. I don't know what EU countries use 800 MHz for.
The US 1900 MHz frequencies are already used for mobile phone service in
the EU, but in two different (and incompatible) bands. The lower
frequency part of 1900 MHz is part of the EU 1800 MHz band, more or
less. The higher frequency part of 1900 MHz is part of the EU
2100 MHz band, used for 3G service.
In any case, in the EU some of 800 MHz and almost all of 1900 MHz is
already used for mobile phone service, just in incompatible ways. This
can't be fixed.
Dennis Ferguson
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