UMTS, using W-CDMA, supports up to 14.0 Mbps transfer rate of data in theory (HSDPA), although at the moment, network users can expect deployed a transfer rate of up to 384 kbit / s for R99 combined, and 7.2 Mbps for HSDPA devices as part down. It is much more than the 9.6 kbit / s of a single GSM error correction circuit channel multiple data or 9.6 kbit / s channels HSCSD (14.4 kbit / s for cdmaOne) and competition with other network technologies such as CDMA2000, PHS or WLAN-offers access to the World Wide Web and other data services on mobile devices.
Precursors to 3G are mobile 2G systems, such as GSM, IS-95, PDC, PHS and other 2G technology deployed in different countries. In the case of GSM, it is a path of evolution 2G, GPRS, also known as 2.5 G. GPRS supports a much better data rate (up to a theoretical maximum of 140.8 kbit / s, so typical rates are closer to 56 kbit / s) and packages rather than connection oriented (circuit). It is deployed in many places where GSM is used. E-GPRS or EDGE, is an evolution of GPRS and is based on more modern coding systems. With EDGE rate packet data can reach about 180 kbit / s (effective). EDGE systems are often referred to as "2.75G Systems".
Since 2006, UMTS networks in many countries have been or are being updated at high speed downlink Packet Access (HSDPA), sometimes known as 3.5G. Currently, HSDPA allows downlink transfer speeds up to 7.2 Mbit / s. Work is also progressing on improving the uplink transfer rate with the High-Speed Uplink Packet Access (HSUPA). In the longer term, the 3GPP long-term development project plans to move to UMTS 4G speeds of 100 Mbps and 50 Mbps, using the next generation of air interface technology on the basis of Orthogonal frequency-division multiplexing.
The first national consumer UMTS networks launched in 2002 with a heavy emphasis on telecommunications provided by mobile applications such as mobile TV and video call. The data speeds top of the UMTS are now most often used for Internet access: the experience in Japan and elsewhere has shown that user demand for video calls is not high, and phone provided by the audio / video has declined in popularity for the high-speed access to the World Wide Web - either directly on a device or connected to a computer via Wi-Fi, Bluetooth, infrared or USB.
Edited and Rewritten from Source: http://en.wikipedia.org
Precursors to 3G are mobile 2G systems, such as GSM, IS-95, PDC, PHS and other 2G technology deployed in different countries. In the case of GSM, it is a path of evolution 2G, GPRS, also known as 2.5 G. GPRS supports a much better data rate (up to a theoretical maximum of 140.8 kbit / s, so typical rates are closer to 56 kbit / s) and packages rather than connection oriented (circuit). It is deployed in many places where GSM is used. E-GPRS or EDGE, is an evolution of GPRS and is based on more modern coding systems. With EDGE rate packet data can reach about 180 kbit / s (effective). EDGE systems are often referred to as "2.75G Systems".
Since 2006, UMTS networks in many countries have been or are being updated at high speed downlink Packet Access (HSDPA), sometimes known as 3.5G. Currently, HSDPA allows downlink transfer speeds up to 7.2 Mbit / s. Work is also progressing on improving the uplink transfer rate with the High-Speed Uplink Packet Access (HSUPA). In the longer term, the 3GPP long-term development project plans to move to UMTS 4G speeds of 100 Mbps and 50 Mbps, using the next generation of air interface technology on the basis of Orthogonal frequency-division multiplexing.
The first national consumer UMTS networks launched in 2002 with a heavy emphasis on telecommunications provided by mobile applications such as mobile TV and video call. The data speeds top of the UMTS are now most often used for Internet access: the experience in Japan and elsewhere has shown that user demand for video calls is not high, and phone provided by the audio / video has declined in popularity for the high-speed access to the World Wide Web - either directly on a device or connected to a computer via Wi-Fi, Bluetooth, infrared or USB.
Edited and Rewritten from Source: http://en.wikipedia.org
