09-07-2012, 03:08 PM
Access Network Evolution Beyond Third Generation Mobile Communications
[attachment=27282]
THE DEVELOPMENT OF MOBILE RADIO SYSTEMS
Mobile radio communication systems have been
successfully deployed since about 1980 in different
regions of the world to extend telephone services
to mobile users. In the first generation,
analog systems were developed to support mainly
voice telephony. These narrowband systems
are based on frequency-division duplex (FDD)
and frequency modulation. In the beginning of
mobile communications there was only home
network roaming; as a first step forward, national
roaming was required by the national
monopoly network operators.
TRENDS IN MOBILE COMMUNICATIONS
Mobile communications are determined by economic
and technical trends and, in the future,
mainly by application requirements. With the evolution
of second-generation systems and the
emerging third-generation systems, more advanced
data and multimedia services are becoming available
in addition to mobile telephony. These trends
and requirements are affecting the vision of future
systems beyond the third generation.
ECONOMIC TRENDS AND SERVICE DEMANDS
In the last 10 years many countries introduced
deregulation of telecommunications services
through liberalization and privatization to support
competition in the telecommunications
markets. Due to this competition the rates for
telecommunication services decreased and the
number of subscribers, in particular for mobile
radio systems, increased much faster than expected.
The annual growth rates in important markets
increased from 1998 with about 60 % to
expected 100 percent per year in 2002. In 2000
the number of mobile subscribers is higher than
400 million worldwide, and for 2010 more than
1700 million mobile subscribers are expected
worldwide [4, 7, 8].
CONCLUSIONS
Mobile multimedia applications are already
starting today with evolved second-generation
mobile radio systems. Third-generation mobile
radio systems provide more opportunities for
mobile multimedia through improved wideband
and more flexible radio interfaces. Systems
beyond the third generation will not just be
more wideband access systems to provide higher
data rates to users. These systems will follow the
general concept of many combined optimized
access systems for special purposes on a common
flexible network platform, which complement
each other in an efficient and optimized
way from the user’s perspective. Depending on
the selected services, available access systems,
and bearer capabilities, this new system will
select the most appropriate access.
[attachment=27282]
THE DEVELOPMENT OF MOBILE RADIO SYSTEMS
Mobile radio communication systems have been
successfully deployed since about 1980 in different
regions of the world to extend telephone services
to mobile users. In the first generation,
analog systems were developed to support mainly
voice telephony. These narrowband systems
are based on frequency-division duplex (FDD)
and frequency modulation. In the beginning of
mobile communications there was only home
network roaming; as a first step forward, national
roaming was required by the national
monopoly network operators.
TRENDS IN MOBILE COMMUNICATIONS
Mobile communications are determined by economic
and technical trends and, in the future,
mainly by application requirements. With the evolution
of second-generation systems and the
emerging third-generation systems, more advanced
data and multimedia services are becoming available
in addition to mobile telephony. These trends
and requirements are affecting the vision of future
systems beyond the third generation.
ECONOMIC TRENDS AND SERVICE DEMANDS
In the last 10 years many countries introduced
deregulation of telecommunications services
through liberalization and privatization to support
competition in the telecommunications
markets. Due to this competition the rates for
telecommunication services decreased and the
number of subscribers, in particular for mobile
radio systems, increased much faster than expected.
The annual growth rates in important markets
increased from 1998 with about 60 % to
expected 100 percent per year in 2002. In 2000
the number of mobile subscribers is higher than
400 million worldwide, and for 2010 more than
1700 million mobile subscribers are expected
worldwide [4, 7, 8].
CONCLUSIONS
Mobile multimedia applications are already
starting today with evolved second-generation
mobile radio systems. Third-generation mobile
radio systems provide more opportunities for
mobile multimedia through improved wideband
and more flexible radio interfaces. Systems
beyond the third generation will not just be
more wideband access systems to provide higher
data rates to users. These systems will follow the
general concept of many combined optimized
access systems for special purposes on a common
flexible network platform, which complement
each other in an efficient and optimized
way from the user’s perspective. Depending on
the selected services, available access systems,
and bearer capabilities, this new system will
select the most appropriate access.