Mobile Phone Systems: A Brief Analysis For You
Author: James Dyson

Why mobile phones sometimes become a challenge today? This
happen mainly due to the existence of different incompatible
mobile systems worldwide, which often mark out the entire
region from others. That is, the technology on which a mobile
network works totally differ from other.

To say, by much delving into the technical aspects of each
system, GSM, TDMA, CDMA, NMT, D-AMPS etc are the systems using
which the mobile phones work and in most case, a mobile phone
from a system is not supported in other. So what all are that
systems and how do they exist together in this mobile world?

Global System for Mobile Telephones (GSM)

GSM is one of the few mobile phone system widely adopted
worldwide. GSM system for mobile phones is used in nearly 200
countries, from Europe to all over the World.

Technically said, the system utilizes the 900 MHz spectrum for
its signals to travel over the air. GSM providers from Europe,
Africa, and Asia later added additional spectrum of 1800 MHz.
However, in North America, GSM service operates at 800 MHz or
1900 MHz.

The good news here for the world travelers is that most
manufacturers offer Dual-band (900 and 1900 MHz), Tri-band
(900, 1800 and 1900 MHz) and also Quad-band (800, 900, 1800 and
1900 MHz) mobile phones that these phones can be practically
used anywhere the GSM systems are installed. But, countries
like South Korea and Japan does not use GSM system for their
mobile phone services. A mobile phone with tri-band should be
one that global travelers should have to make them available
for international roaming agreements from various GSM carriers
worldwide.

To add, this system provides excellent coverage and even in
some cities, it is used in moving subway trains after modifying
some mobile arrangements. GSM is an innovative system that
allows you faxing and SMS (short messaging service). So you can
receive flight updates and breaking news alerts over your mobile
phone instantly.

Time Division Multiple Access (TDMA)

TDMA was the first wireless digital network extensively used in
the US. The system still makes the core of major US wireless
networks and only in recent day network providers are
converting some of their bandwidths to GSM 1900. Very few other
regions in the World other than the US use this system. But
future estimations show that the escalating growth of GSM and
CDMA systems in the US will put an end of TDMA system.

Code Division Multiple Access (CDMA)

Developed by QualComm, is the competitor to TDMA in the US.
There are now wide adopted CDMA systems installed elsewhere in
the world. This system offers international roaming capability
similar to that of GSM. One most important side of CDMA is that
it is more efficient than GSM in a few aspects. But in practice,
GSM has been widely used and have rich features than that of
CDMA.

However, few other systems exist in some other parts of the
world but are technically obsolete. Out of as many mobile
systems, GSM and CDMA are those that have established
themselves and are egressing further.


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