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What is UMTSTM?                                                                                   
UMTS stands for Unified Mobile Telecommunication System, which is one of ITU's proposals for 3G mobile cellular technology. UMTS promises service speeds of 2 Mbps, which will allow for a wide range of services including video conferencing. UMTS is the next logical evolutionary step for GSM networks, as it is based on the same GSM architecture. UMTS allows many more applications to be introduced to a worldwide base of users and provides a vital link between today's multiple GSM systems and the ultimate single worldwide standard for all mobile telecommunications, International Mobile Telecommunications-2000 (IMT-2000).

The Technology
The terms W-CDMA and UMTS are interchangeably used. W-CDMA stands for Wideband Code Division Multiple Access. W-CDMA is called so because its channel is four times wider than the current CDMA2000 1X channel. Which means it needs a minimum channel allocation of 5 MHz. As a result, W-CDMA requires a complete modification of current base station equipments as well as the mobile terminal.
W-CDMA will use variable/selectable direct sequence spread spectrum chip rates to allow data rates as low as 8 kbps upto 2Mbps. W-CDMA can be implemented on 2G GSM systems by migrating via GPRS and EDGE.

Worldwide
W-CDMA (UMTS) networks have already been deployed in countries like Japan, Australia, Italy, UK, Sweden and a lot more launches are expected in the near future.

For Further reference please refer to www.umtsworld.com


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