3G TECHNOLOGY

 Introduction:: Also known as IMT 2000,3G transmits packet switched data efficiently and with increased bandwidth. 3G technologies make use of TDMA and CDMA,and also uses value added services like mobile television, GPS (global positioning system) and video conferencing. 3G technology is much flexible, because it is able to support the 5 major radio technologies. These radio technologies operate under CDMA, TDMA and FDMA.CDMA holds for IMT-DS (direct spread), IMT-MC (multi carrier). TDMA accounts for IMT-TC (time code), IMT-SC (single carrier). FDMA has only one radio interface known as MT-FC or frequency code. Third generation technology is really affordable due to the agreement of industry. This agreement took pace in order to increase its adoption by the users. 3G (Thrid Generation Technology) system is compatible to work with the 2G technologies.

Technical aspect:: There are many 3G technologies as W-CDMA, GSM EDGE, UMTS, DECT, WiMax and CDMA 2000. Edge tecnology allows faster data transfer than gsm. Wimax is a wireless technology.It transmits variety of wireless signals. It can be operated on the multi point and point modes.
 It is portable technology. This technology is based on the wireless internet access. Name of the WiMax was developed in 2001 by WiMax forum. This technology removes the need for wires and is capable enough to provide 10mbits/sec. It can connect you to hotspot.
 How 3G (CDMA 2000) Works Code Division Multiple Access 2000 is approved by 3GPP2 Organization. CDMA200 hybrid with IS-95 B provides an unlimited access to IMT-200 Band as well as cdma 200 1x and ideal conditions for the highest data transfer rate. The cdma 2000 1x evolves into cdma 200 1x EV. This cdma 200 1x EV IS put into service in two different forms; Cdma 2000 1x EV-DO- 1X Evolution data only able to use 1.25 MHz Cdma 2000 1x EV-DV- 1x Evolution Data and Voice also use 1.25 MHz All these versions are supposed to attain the highest speed for greater efficiency of the mobile phones.
 How 3G (W-CDMA / UMTS) Works 3G mobile technology has been marked by the CDMA accomplishment. ETSI Alpha group develop this technology on radio access method. W-CDMA offers challenges in shapes of versatility and complexity of its design. Its multifaceted single algorithm made the complete system more difficult hence the receiver becomes a more complex device. It provides friendly environment to the multi-users with greater simulation and broader interface able to transfer data with time variations. UMTS network group is experimenting on this new technology to maintain previous 2G module features and the added features as well in 3G.