Ben
1st April 2005, 04:00 PM
http://homepages.uel.ac.uk/u0227598/intro3g.htm
Introduction to 3G Wireless
3G stands for third generation, and is a wireless industry term for a collection of international standards and technologies aimed at increasing efficiency and improving the performance of mobile wireless networks.
3G wireless services offer enhancements to current applications, including greater data speeds, increased capacity for voice and data and the advent of packet data networks versus todays switched networks.
As second-generation (2G) wireless networks evolve into third-generation systems around the globe operators are working hard to enable 2G and 3G compatibility and worldwide roaming, including 3G UMTS, GSM, GPRS, IS-95A/B, 3G CDMA2000 1X and CDMA2000 1xEV technologies.
The Different Types Of 3G
3G is a generic term covering a range of future wireless network technologies, including WCDMA, CDMA2000, UMTS and EDGE.
3G combines high-speed mobile access with Internet Protocol (IP) based services. This doesn't just mean fast mobile connection to the World Wide Web - by liberating us from slow connections, cumbersome equipment and immovable access points, 3G will enable new ways to communicate, access information, conduct business and learn. This is summarised in the diagram on below produced by Allied Business.
WCDMA - Wideband Code Division Multiple Access
A technology for wideband digital radio communications of Internet, multimedia, video and other capacity-demanding applications. WCDMA has been selected for the third generation of mobile telephone systems in Europe, Japan and the United States.
Voice, images, data, and video are first converted to a narrowband digital radio signal. The signal is assigned a marker (spreading code) to distinguish it from the signal of other users. WCDMA uses variable rate techniques in digital processing and it can achieve multi-rate transmissions.
WCDMA has been adopted as a standard by the ITU under the name IMT-2000 direct spread.
CDMA 2000 - Code Division Multiple Access 2000
Commercially introduced in 1995, CDMA quickly became one of the world's fastest-growing wireless technologies. In 1999, the International Telecommunications Union selected CDMA as the industry standard for new "third-generation" (3G) wireless systems. Many leading wireless carriers are now building or upgrading to 3G CDMA networks in order to provide more capacity for voice traffic, along with high-speed data capabilities.
Today, over 100 million consumers worldwide rely on CDMA for clear, reliable voice communications and leading-edge data services.
CDMA2000 1X for Voice and Data
CDMA2000 1X technology supports both voice and data services over a standard (1X) CDMA channel, and provides many performance advantages over other technologies. First, it provides up to twice the capacity of earlier CDMA systems (with even bigger gains over TDMA and GSM), helping to accommodate the continuing growth of voice services as well as new wireless Internet services. Second, it provides peak data rates of up to 153 kbps (and up to 307 kbps in the future), without sacrificing voice capacity for data capabilities.
CDMA2000 1X phones also feature longer standby times. And because it's backwards-compatible with earlier CDMA technology, CDMA2000 1X provides an easy and affordable upgrade path for both carriers and consumers.
CDMA2000 1xEV-DO for Faster Data
For those who want higher-speed or higher capacity data services, a data-optimized version of CDMA2000 called 1xEV-DO provides peak rates of over 2 Mbps, with an average throughput of over 700 kbps - comparable to wireline DSL services and fast enough to support even demanding applications such as streaming video and large file downloads. CDMA2000 1xEV-DO also delivers data for the lowest cost per megabyte, an increasingly important factor as wireless Internet use grows in popularity. 1xEV-DO devices will provide "always-on" packet data connections, helping to make wireless access simpler, faster and more useful than ever.
UMTS - Universal Mobile Telecommunications System
The name for the third generation mobile telephone standard in Europe, standardized by ETSI.
EDGE - Enhanced Data for Global Evolution
A technology that gives GSM the capacity to handle services for the third generation of mobile telephony. EDGE was developed to enable the transmission of large amounts of data at a high speed, 384 kilobits per second. EDGE uses the same TDMA (Time Division Multiple Access) frame structure, logic channel and 200kHz carrier bandwidth as today's GSM networks, which allows existing cell plans to remain intact.
Introduction to 3G Wireless
3G stands for third generation, and is a wireless industry term for a collection of international standards and technologies aimed at increasing efficiency and improving the performance of mobile wireless networks.
3G wireless services offer enhancements to current applications, including greater data speeds, increased capacity for voice and data and the advent of packet data networks versus todays switched networks.
As second-generation (2G) wireless networks evolve into third-generation systems around the globe operators are working hard to enable 2G and 3G compatibility and worldwide roaming, including 3G UMTS, GSM, GPRS, IS-95A/B, 3G CDMA2000 1X and CDMA2000 1xEV technologies.
The Different Types Of 3G
3G is a generic term covering a range of future wireless network technologies, including WCDMA, CDMA2000, UMTS and EDGE.
3G combines high-speed mobile access with Internet Protocol (IP) based services. This doesn't just mean fast mobile connection to the World Wide Web - by liberating us from slow connections, cumbersome equipment and immovable access points, 3G will enable new ways to communicate, access information, conduct business and learn. This is summarised in the diagram on below produced by Allied Business.
WCDMA - Wideband Code Division Multiple Access
A technology for wideband digital radio communications of Internet, multimedia, video and other capacity-demanding applications. WCDMA has been selected for the third generation of mobile telephone systems in Europe, Japan and the United States.
Voice, images, data, and video are first converted to a narrowband digital radio signal. The signal is assigned a marker (spreading code) to distinguish it from the signal of other users. WCDMA uses variable rate techniques in digital processing and it can achieve multi-rate transmissions.
WCDMA has been adopted as a standard by the ITU under the name IMT-2000 direct spread.
CDMA 2000 - Code Division Multiple Access 2000
Commercially introduced in 1995, CDMA quickly became one of the world's fastest-growing wireless technologies. In 1999, the International Telecommunications Union selected CDMA as the industry standard for new "third-generation" (3G) wireless systems. Many leading wireless carriers are now building or upgrading to 3G CDMA networks in order to provide more capacity for voice traffic, along with high-speed data capabilities.
Today, over 100 million consumers worldwide rely on CDMA for clear, reliable voice communications and leading-edge data services.
CDMA2000 1X for Voice and Data
CDMA2000 1X technology supports both voice and data services over a standard (1X) CDMA channel, and provides many performance advantages over other technologies. First, it provides up to twice the capacity of earlier CDMA systems (with even bigger gains over TDMA and GSM), helping to accommodate the continuing growth of voice services as well as new wireless Internet services. Second, it provides peak data rates of up to 153 kbps (and up to 307 kbps in the future), without sacrificing voice capacity for data capabilities.
CDMA2000 1X phones also feature longer standby times. And because it's backwards-compatible with earlier CDMA technology, CDMA2000 1X provides an easy and affordable upgrade path for both carriers and consumers.
CDMA2000 1xEV-DO for Faster Data
For those who want higher-speed or higher capacity data services, a data-optimized version of CDMA2000 called 1xEV-DO provides peak rates of over 2 Mbps, with an average throughput of over 700 kbps - comparable to wireline DSL services and fast enough to support even demanding applications such as streaming video and large file downloads. CDMA2000 1xEV-DO also delivers data for the lowest cost per megabyte, an increasingly important factor as wireless Internet use grows in popularity. 1xEV-DO devices will provide "always-on" packet data connections, helping to make wireless access simpler, faster and more useful than ever.
UMTS - Universal Mobile Telecommunications System
The name for the third generation mobile telephone standard in Europe, standardized by ETSI.
EDGE - Enhanced Data for Global Evolution
A technology that gives GSM the capacity to handle services for the third generation of mobile telephony. EDGE was developed to enable the transmission of large amounts of data at a high speed, 384 kilobits per second. EDGE uses the same TDMA (Time Division Multiple Access) frame structure, logic channel and 200kHz carrier bandwidth as today's GSM networks, which allows existing cell plans to remain intact.