what is 3g?

Answer 1

3rd Generation Cellular Systems.

Answer 2

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3G
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Mobile phone and data
standards
0G
PTT
MTS
IMTS
AMTS
OLT
MTD

0.5G
Autotel/PALM
ARP

1G
NMT
AMPS
Hicap
CDPD
Mobitex
DataTac

2G
GSM
iDEN
D-AMPS
IS-95/cdmaOne
PDC
CSD
PHS

2.5G
GPRS
HSCSD
WiDEN

2.75G
CDMA2000 1xRTT/IS-2000
EDGE (EGPRS)

3G
W-CDMA
UMTS (3GSM)
FOMA
1xEV-DO/IS-856
TD-SCDMA
GAN/UMA

3.5G
HSDPA

3.75G
HSUPA

4G
Frequency bands
SMR
Cellular
PCS

3G (or 3-G) is short for third-generation technology. It is used in the context of mobile phone standards. The services associated with 3G provide the ability to transfer simultaneously both voice data (a telephone call) and non-voice data (such as downloading information, exchanging email, and instant messaging). In marketing 3G services, video telephony has often been used as the killer application for 3G.

3G networks are not upgrades of 2G networks and do not operate on the same frequency spectrum; rather, entirely new networks need to be built and new frequencies need to be assigned to mobile operators. Induced euphoria led to huge spectrum-licensing fees in many countries, especially in Europe, where spectrum auctions went into the billions of euros. These spectrum licensing fees which were collected years before actual 3G development, together with the enormous investments necessary to build the all-new 3G networks, financially strained a number of mobile operators, delaying 3G roll-out worldwide except in Japan and South Korea, where such spectrum licensing fees were non-existent as the priority in those countries was set on national IT infrastructure development.

Contents [hide]
1 Background
2 Features
3 3G external modems
4 Standard 3G
5 Issues
6 References
7 See also
8 External links


The first country which introduced 3G on a large commercial scale was Japan. In 2005, about 40% of subscribers used 3G networks only, with 2G being on the way out in Japan. It was expected that during 2006 the transition from 2G to 3G would be largely completed in Japan, and upgrades to the next 3.5G stage with 3 Mbit/s data rates were underway.

The successful 3G introduction in Japan showed that video telephony was not the killer application for 3G networks after all. The real-life usage of video telephony on 3G networks was found to be a small fraction of all services. On the other hand, downloading of music found strong acceptance by customers. Music download services in Japan were pioneered by KDDI with the EZchakuuta and Chaku Uta Full services.

Technically, 3G networks are not IEEE 802.11 networks. IEEE 802.11 networks are short range, primarily internet access networks, while 3G networks are wide area cellular telephone networks which evolved to incorporate high-speed internet access and video telephony to these networks.

[edit]
Background
It is estimated that there are about 60 3G networks in 25 countries around the world. In Asia, Europe and the USA, telecommunication companies use WCDMA technology with the support of around 100 terminal designs to operate 3G mobile networks.

In 2001, NTT DoCoMo - one of the giant telecommunication companies in Japan - was the first telecommunication company to launch a commercial WCDMA network. The introduction of 3G services within Europe began in early 2003.

The official 3G mobile network is the systems and services based on the ITU family of standards under the International Mobile Telecommunications programme, 'IMT-2000'. A boost was given to 3G mobile networks in Europe when the EU council suggested that the 3G operators should cover 80% of the European national populations by the end of 2005.

[edit]
Features
The most significant features offered by third generation (3G) mobile technologies are the momentous capacity and broadband capabilities to support greater numbers of voice and data customers - especially in urban centres - plus higher data rates at lower incremental cost than 2G.

By using the radio spectrum in bands identified, which is provided by the ITU for Third Generation IMT-2000 mobile services, it subsequently licensed to operators. 3G uses 5 MHz channel carrier width to deliver significantly higher data rates and increased capacity compared with 2G networks.

The 5 MHz channel carrier provides optimum use of radio resources for operators who have been granted large, contiguous blocks of spectrum. On the other hand, it also helps to reduce the cost to 3G networks while being capable of providing extremely high-speed data transmission to users.

It also allows the transmission of 384kbps for mobile systems and 2Mbps for stationary systems. 3G users are expected to have greater capacity and improved spectrum efficiency, which will allow them to access global roaming between different 3G.

[edit]
3G external modems
Huawei makes USB 3G datacard modems for Vodafone (Vodafone Mobile Connect USB Modem).

Using this USB card, customers are able to access 3G broadband services, regardless of their choice of computer (tablet PC, PDA...). Even the software installs itself (self installing) from the modem, so that absolutely no kwnoledge of technology is required to get online in moments.

It offer download speeds of around 1.4 Mbps and upload speeds of upto 384 Kbps, across Vodafone´s growing 3G broadband footprint. When outside of 3G broadband coverage, customers will automatically be able to access the web using Vodafone´s existing GPRS services.

[edit]
Standard 3G
International Telecommunications Unit (ITU): IMT-2000 consists of five radio interfaces

W-CDMA
CDMA2000
CDMA2001
TD-CDMA / TD-SCDMA
UWC-136
DECT+
[edit]
Issues
Even though 3G has successfully been introduced to European mobile users, there are some issues that are debated by 3G providers and users.

High input fees for the 3G service licenses;
Great differences in the licensing terms;
Current high debt of many telecommunication companies, making it more of a challenge to build the necessary infrastructure for 3G;
Member State support to the financially troubled operators;
Health aspects of the effects of electromagnetic waves;
Expense and bulk of 3G phones;
Lack of 2G mobile user buy-in for 3G wireless service;
Lack of coverage because it is still new service;
High prices of 3G mobile services in some countries, including Internet access (see flat rate).
[edit]
References
The 3G Portal - Independent 3G Information Resource News, White Papers and Feature Articles
3rd Generation Partnership Project (3GPP) - 3G reference specification (W-CDMA based)
UMTS Forum - UMTS deployment list (as at January 2004)
3rd Generation Partnership Project2 (3GPP2) - 3G reference specification (CDMA2000 based)
CDMA Development Group - CDMA2000 Operator list]
Global mobile Suppliers Association ( GSA )- Representing the leading GSM/3G suppliers worldwide
3G in Japan - FAQ
3GToday.com - CDMA2000 and WCDMA operator list with map, printable list
- Third Generation Mobile Communications
Advantage of 3G
History and future milestones
what is UMTS
3G Cellular Data to Wi-Fi How-To The Yellow Subterfuge 3G GPRS Blog
[edit]
See also
2G
2.5G
3.5G
3.75G
4G
Evolution to 3G
3GP 3G multimedia container format (mobile video)
IP Multimedia Subsystem
WiBro
WiMAX
3, a mobile phone operator named for its adoption of 3G
Mobile modem
[edit]
External links
Worlds largest 3G network launched in Australia
Telstra Next G
Free Whitepapers on 3G/WCDMA/HSDPA
3G: Building the Worlds Biggest Machine
Info and Whitepapers on Telecom/3G/CDMA
3G in Africa
Intro To 3G
- 3G Mobile Community
- 3G Healthcare Service
3GP Converters, Programs
Retrieved from "http://en.wikipedia.org/wiki/3G"
Categories: Mobile telephony standards | Mobile

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