Welcome to yoursite name
APPLICATIONS |
WALLPAPERS |
RINGTONES |
GAMES |
|
THEMES |
VIDEOS |
Dictionary
Dictionary
Confused about mobile related terms like CDMA,PTT,GSM,SI,EDGE etc.
* Global System for Mobile Communications
This is the most popular standard for mobile phones in the world. GSM
service is used by over 6 billion people across more than 200
countries. The GSM standard makes international roaming pretty common
between mobile phone service providers, enabling all their subscribers
to use their cell phones in different parts of the world.
* Code Division Multiple Access (CDMA)
CDMA is a form of multiplexing and a method of multiple access that
does not divide up the channel by time, or frequency, but instead
encodes data with a special code associated with each channel and uses
the constructive interference properties of the special codes which can
perform the multiplexing. CDMA also refers to digital cellular
telephony systems that use this multiple access scheme. CDMA phones
usually do not need a SIM card.
* General Packet Radio Service (GPRS)
GPRS is a mobile data service available to subscribers of GSM mobile
phones. GPRS data transfer is mostly charged per kilobyte (KB) of
transferred data to and from the cell phone. GPRS is utilized for
services such as Internet and MMS. In the future, it is still
anticipated that low cost voice over IP will be made available in
mobile phones.
* Subscriber Identity Module (SIM)
SIM is a removable smart card that is used in the cell phone and was
available in two standard sizes. Initially it was the size of a credit
card, while its more popular and widely used mini version has a width
of 25 mm.This has been adopted by most cell phone manufacturers. The
SIM card securely stores a key code which identifies a mobile phone to
its service provider.
* Enhanced Data rates for GSM Evolution (EDGE)
EDGE is an enhancement to the GSM networks which makes use of theTDMA
(Time Division Multiple Access) frame structure, logic channel and 200
KHz carrier bandwidth. EDGE is not only capable of providing three
times the data capacity of GPRS but also has improved data transmission
reliability. EDGE is employed for advanced mobile services that require
high data transmission rate such as downloading of audio and video
clips, high speed and quality Internet access etc, EDGE is classified
as a 2.75G network technology.
* Push-to-Talk (PTT)
PTT also known as Press-to-Transmit, is a method of conversing on
half-duplex communication lines by making use of a momentary button to
switch from voice reception mode to transmission mode. Some mobile
operators offer the PPT service on mobile phones; it allows voice
signals to be transmitted from one user to another on the system
without the need of an established existing connection.
* 3G- 3rd Generation Technology
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.Worldwide roll-out of 3G networks was delayed in some countries by
the enormous costs of additional spectrum licensing fees. In many parts
of the world 3G networks do not use the same radio frequencies as 2G,
requiring mobile operators to build entirely new networks and license
entirely new frequencies; a notable exception is the United States
where carriers operate 3G service in the same frequencies as other
services. The license fees in some European countries were particularly
high, bolstered by initial excitement over 3G’s potential. Other
delays were as a result of the expenses related to upgrading equipment
for the new systems. Japan and South Korea were relatively quick to
adopt 3G, because their governments prioritize technological
infrastructure development, and spectrum licensing fees are minimal.
Currently 3G compatible phones in are sold in India by Nokia, Sony
Ericsson, Samsung etc, but currently no operators are providing their
services based on 3G.