3G Technology

              3G is a generic name for a set of mobile technologies set to be launched by the end of 2001 which use a host of high-tech infrastructure networks, handsets, base stations, switches and other equipment to allow mobiles to offer high-speed Internet access, data, video and CD-quality music services. That is third-generation technology of mobile phone standards. The services associated with 3G include wide-area wireless voice telephony and broadband wireless data, all in a mobile environment. In marketing 3G services, video telephone has often been suggested as the killer application for 3G. Data speeds in 3G networks should be show speeds of to up to 2 Megabits per second, an increase on current technology.

              Standards in 3G Mobile Technology from International Telecommunications Unit (ITU) : IMT-2000 consists of five radio interfaces are :
              W-CDMA
              CDMA2000
              TD-CDMA / TD-SCDMA
              UWC (Or EDGE)
              DECT

W-CDMA (Wideband Code Division Multiple Access) is a type of 3G cellular network. W-CDMA is the higher speed transmission protocol used in the Japanese FOMA system and in the UMTS system, a third generation follow-on to the 2G GSM networks deployed worldwide.                CDMA2000 is a hybrid 2.5G / 3G protocol of mobile telecommunications standards that use CDMA, a multiple access scheme for digital radio, to send voice, data, and signaling data (such as a dialed telephone number) between mobile phones and cell sites. CDMA2000 is considered a 2.5G protocol in 1xRTT and a 3G protocol in EVDO. (CDMA : Code Division Multiple Access is a digital wireless technology that allows multiple users to share radio frequencies at the same time without interfering with each other. A telephone or data call is assigned a unique code that distinguishes it from others and since the signals hop among different frequencies)

              TD-CDMA is the primary air interface used by UMTS-TDD. It uses increments of 5MHz of spectrum, each slice being divided into 10ms frames containing fifteen time slots (1500 per second). The time slots are allocated in fixed percentage for downlink and uplink. Code Division Multiple Access is used within each time slot to multiplex streams from or to multiple transceivers.

               EDGE : Enhanced Data rates for GSM Evolution or Enhanced GPRS (EGPRS), is a digital mobile phone technology that allows it to increase data transmission rate and improve data transmission reliability.

               DECT : Digital Enhanced Cordless Telecommunications is an ETSI standard for digital portable phones, commonly used for domestic or corporate purposes. DECT can also be used for wireless data transfers. DECT is recognized by the ITU as fulfilling the IMT-2000 requirements and thus qualifies as a 3G syste

		Evolution to 3G               The Evolution to 3G describes the updating of cellular mobile telecommunications networks around the world to use new 3G technologies. This process is taking place over the period 1999 to 2010. Japan is the first country having introduced 3G nationally, and in Japan the transition to 3G has been largely completed during 2005/2006. In December 2005 there were 100 3G networks in operation in 40 countries in the world. In Asia, Europe, and the USA and Canada, telecommunication companies use W-CDMA technology with the support of around 100 terminal designs to operate 3G mobile networks. 3G technologies enable network operators to offer users a wider range of more advanced services while achieving greater network capacity through improved spectral efficiency.