Fixed or Mobile xG
Wireless Systems and Networks: 4G, 5G, 6G, xG:
Fourth-Generation Mobile
Communications System (4G) - TACS
4G is an initialism of the term
Fourth-Generation Communications System. A 4G system will provide an
end-to-end IP solution where voice, data and streamed multimedia can
be served to users on an "Anytime, Anywhere" basis at higher data
rates than previous generations. No formal definition is set as to
what 4G is, but the objectives that are predicted for 4G can be
summarized as follows:
4G will be a fully IP-based integrated system of systems and network
of networks achieved after the convergence of wired and wireless
networks as well as computer, consumer electronics, communication
technology, and several other convergences that will be capable of
providing 100 Mbit/s and 1 Gbit/s, respectively, in outdoor and
indoor environments with end-to-end quality of service and high
security, offering any kind of services anytime, anywhere, at
affordable cost and one billing.
Objectives
4G is being developed to
accommodate the quality of service (QoS) and rate requirements set
by forthcoming applications like wireless broadband access,
Multimedia Messaging Service, video chat, mobile TV, High definition
TV content, DVB, minimal service like voice and data, and other
streaming services for "anytime-anywhere". The 4G working group has
defined the following as objectives of the 4G wireless communication
standard:
- A spectrally efficient system
(in bits/s/Hz and bit/s/Hz/site),
- High network capacity: more
simultaneous users per cell,
- A nominal data rate of 100 Mbit/s
while the client physically moves at high speeds relative to the
station, and 1 Gbit/s while client and station are in relatively
fixed positions as defined by the ITU-R,
- A data rate of at least 100 Mbit/s
between any two points in the world,
- Smooth handoff across
heterogeneous networks,
- Seamless connectivity and global
roaming across multiple networks,
- High quality of service for next
generation multimedia support (real time audio, high speed data,
HDTV video content, mobile TV, etc)
- Interoperability with existing
wireless standards, and
- An all IP, packet switched
network.
In summary, the 4G system should
dynamically share and utilise network resources to meet the minimal
requirements of all the 4G enabled users.
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