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In telecommunications, 4G is the fourth generation of cellular wireless standards. It is a successor to the 3G and 2G families of standards. In 2008, the ITU-R organization specified the IMT-Advanced (International Mobile Telecommunications Advanced) requirements for 4G standards, setting peak speed requirements for 4G service at 100 Mbit/s for high mobility communication (such as from trains and cars) and 1 Gbit/s for low mobility communication (such as pedestrians and stationary users).
A 4G system is expected to provide a comprehensive and secure all-IP based mobile broadband solution to laptop computer wireless modems, smartphones, and other mobile devices. Facilities such as ultra-broadband Internet access, IP telephony, gaming services, and streamed multimedia may be provided to users.
Pre-4G technologies such as mobile WiMAX and Long term evolution (LTE) have been on the market since 2006 and 2009 respectively, and are often branded as 4G. The current versions of these technologies did not fulfill the original ITU-R requirements of data rates approximately up to 1 Gbit/s for 4G systems. Marketing materials use 4G as a description for LTE and Mobile-WiMAX in their current forms.
IMT-Advanced compliant versions of the above two standards are under development and called “LTE Advanced” and “WirelessMAN-Advanced” respectively. ITU has decided that “LTE Advanced” and “WirelessMAN-Advanced” should be accorded the official designation of IMT-Advanced. On December 6, 2010, ITU announced that current versions of LTE, WiMax and other evolved 3G technologies that do not fulfill "IMT-Advanced" requirements could be considered "4G", provided they represent forerunners to IMT-Advanced and "a substantial level of improvement in performance and capabilities with respect to the initial third generation systems now deployed."
In all suggestions for 4G, the CDMA spread spectrum radio technology used in 3G systems and IS-95 is abandoned and replaced by OFDMA and other frequency-domain equalization schemes. This is combined with MIMO (Multiple In Multiple Out), e.g., multiple antennas, dynamic channel allocation and channel-dependent scheduling.
After 2G, came the more efficient technology 3G, it established its roots in late 2000, while ITU agreed to the 3G standards in 1999. The Third Generation technology now can easily be found all over the world on nearly all standard radio technologies such as CDMA and the GSM. The first cellular network provider that set up the 3G grid in the year 2003, is Verizon. 3G technology provides up to 2 mpbs data transfer rate at fixed spots (when user is stationary) and minimum 384 kbps when the user is moving. Today almost all the well-known carriers of US provide 3G service and now there are lots of gadgets available in the market with 3G capability.
4G
4G technology, the Fourth Generation Technology, is the very latest and ultra fast technology and it is getting more attention day by day even though this technology is still at its initial stages. 4G technology aims to provide fastest speed to all the users, to the users of mobile or smartphones it intends to provide data transfer rate up to 100 mbps while for its stationary users, it aims to the highest speed of 1 Gbps.
WiMAX and LTE
These are two 4G cellular broadband networks. The WiMAX provides speed up to 128mbps of downloading and for uploading it provides 56mbps, whereas LTE showed in an early implementation speed up to 100mbps downloading and 50 mbps uploading. ITU considers the LTE (Long-Term Evolution) as a standard technology because LTE aims to exceed the specifications of ITU. While WiMAX on the other hand is an IEEE standard, also ITU doesn’t considered WiMAX a true 4G technology because it is not up to the specifications that ITU put forth.
Latest 4G Phones…
HTC Evo
It’s one of the best-selling 4G phones ever released, but does the HTC EVO 4G Android Phone live up to the hype?
The EVO is powerful smartphone packed with features. The big, colorful 4.3 inch screen coupled with the speed of the Sprint 4G network means it’s probably going to be first smartphone you’ll actually enjoy watching videos on. It even comes with a handy kickstand for those sit back and watch moments.
Video content is offered by Spring TV programming, You Tube or you can shoot your own videos using the EVO’s clear 8-megapixel auto-focus camera. Typical download speeds for even the largest video and media files are a few seconds on Sprint 4G. Goodbye 3G!
Samsung Infuse 4G
All the indications are that AT&T and Samsung will announce the official launch of the latest AT&T 4G phone, the Samsung Infuse, on May 5th.
That’s the day the carrier and phone manufacturer have chosen to hold a press conference in New York City. Although details of the exact announcements haven’t been released, we do know the event will include product demos and the Infuse has long been slated for a probable May release.
Other 4G phones likely to at the very least get a mention – and probably a demo and launch date – are a couple of other Samsung phones – the Nexus S or the Galaxy S II.
Well these were some cool phone featuring 4G already available and used in USA by AT &T ,we hoped you liked it..and want to learn more,do comments and dont forget to share it..
