New 4G super fast wirless:
Introduction:
4G:
A 4G system may upgrade existing communication networks and is
expected to provide a comprehensive and secure IP based solution where
facilities such as voice, data and streamed multimedia will be provided to
users on an "Anytime, Anywhere" basis and at much higher data rates
compared to previous generations.
4G is being developed to accommodate the Q's and rate requirements set by forthcoming applications like wireless broadband access, Multimedia Messaging Service
(M M S), video chat, mobile TV, HDTV content, Digital Video Broadcasting (D V B), minimal services like voice and data,and other services that utilize bandwidth.
4G features
According to the members of the 4G working group, the infrastructure and the terminals of 4G will have almost all the standards from 2G to 4G implemented. Although legacy systems are in place to adopt existing users, the infrastructure for 4G will be only packet-based (all-IP). Some proposals suggest having an open Internet platform. Technologies considered to be early 4G include: FLASH O-F-D-M, the 802.16e mobile version of Max (also known as WI-BRO in South Korea), and H-SD MA (see I-BURST). 3GP Long Term Evolution may reach the market 1?2 years after Mobile WI-MAX is released.
An even higher speed version of WI-MAX is the I-E-E-E 802.16m specification. L-T-E Advanced will be the later evolution of the 3GP L-T-E standard. 4x4 MIMO called VSF-OFCDM at 100 Mbit/s while moving, and 1 Gbit/s while stationary. In February 2007, NTT DoCoMo completed a trial in which they reached a maximum packet transmission rate of approximately 5 G bit/s in the downlink with 12x12 MIMO using a 100MHz frequency bandwidth while moving at 10 km/h,and is planning on releasing the first commercial network in 2010.
Digiweb, an Irish fixed and wireless broadband company, has
announced that they have received a
mobile communications license from the Irish Telecoms
regulator, ComReg. This service will be
issued the mobile code 088 in Ireland and will be used for
the provision of 4G Mobile
communications.
Digi web launched a mobile broadband network using FLASH-OFDM
technology at 872 MHz.Pervasive networks are an amorphous and at present entirely
hypothetical concept where the user can be simultaneously connected to several wireless access
technologies and can seamlessly move between them (See vertical hand off, IEEE 802.21). These
access technologies can be Wi-Fi, UMTS,
EDGE, or any other future access technology. Included in
this concept is also smart-radio (also
known as cognitive radio technology) to efficiently manage
spectrum use and transmission power as
well as the use of mesh routing protocols to create a
pervasive network.
Verizon Wireless announced on September 20, 2007 that it
plans a joint effort with the Vodafone Group to transition its networks to the 4G standard LTE. On
December 9, 2008, Verizon Wireless
announced that they intend to build and begin to roll out a
LTE network by the end of 2009.
Telus and Bell Canada, the major Canadian cdmaOne and EV-DO
carriers, have announced that
they will be cooperating towards building a fourth
generation (4G) LTE wireless broadband network in
Canada. As a transitional measure, they are implementing 3G
UMTS to go live by early 2010.[15]
Sprint announced it will be offering a 3G/4G connection plan
for $79.99, but it is only currently
available in Baltimore.
Applications
At the present rates of 15-30 Mbit/s, 4G is capable of
providing users with streaming high definition television. At rates of 100 Mbit/s, the content of a DVD-5
(for example a movie) can be downloaded
within about 5 minutes for offline access.
4G wireless standards
3GPP is currently standardizing LTE Advanced as future 4G
standard. A first set of 3GP requirements on LTE Advanced has been approved in June
2008.
The working groups are currently evaluating various proposals for standardization.
LTE Advanced will be standardized as part of the Release 10 of the 3GPP specification.
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