Definition of ‘3G’
Third generation of wireless technologys
or we usually called ‘3G’ is development from network or mobile
telecommunication technology. Before 3G there are first generation (1G) and
second generation (2D). First generation became standardized in the early 1990s,
while 3G were introduced as early as 2001.The first pre-commercial 3G network
launched in May 2001 by NTT DoCoMo in Japan. The network was branded as FOMA. 3G is mostly used with mobile phones and handsets as a
means to connect the phone to the Internet or the IP networks in order to make
voice and video calls, to download and upload data and to surf the net.
In order to be labeled "3G," a
cellular data transfer standard must meet a set of specifications defined by
the International Telecommunications Union, known as IMT-2000. For example, all
3G standards must provide a peak data transfer rate of at least 2 Mbps. Most 3G
standards, however, provide much faster transfer rates of up to 14.4 Mbps.
3G is a some generic term for network
technologies that the ITU classifies as part of their IMT-2000 specification.
Generally, wireless network technologies must be able to provide a mobile
device with a downlink connection speed of 384kbps in order to be considered a
3G technology. The most used 3G technologies are WCDMA, CDMA 1xEV-DO, and,
technically, EDGE and CDMA 1xRTT.
The transfer rate for 3G networks is
between 128 and 144 kbps (kilobits per second) for devices that are moving fast
and 384 kbps for slow ones(like for pedestrians). For fixed wireless LANs, the
speed goes beyond 2 Mbps.
3G is a set of technologies and standards
that include W-CDMA, WLAN and cellular radio, among others.
3G follows a pattern of G's that started
in the early 1990's by the ITU. The pattern is actually a wireless initiative
called the IMT-2000 (International Mobile Communications 2000). 3G therefore
comes just after 2G and 2.5G, the second generation technologies. 2G
technologies include, among others, the Global System for Mobile (GSM) - the
famous mobile phone technology we use today. 2.5G brings standards that are
midway between 2G and 3G, including the General Packet Radio Service (GPRS),
Enhanced Data rates for GSM Evolution (EDGE), Universal Mobile
Telecommunications System (UMTS) etc.
But there are some disadvantages of
3G development such as 3G cost. 3G is expensive but it is worth it for users
that need connectivity.
source:
http://en.wikipedia.org/wiki/3G
http://www.mobileburn.com/definition.jsp?term=3G
