mise significantly higher data rates (up to 2 Mbits/sec) and a new array of mobile communication services, such as video teleconferencing and web browsing. Full interoperability (global roaming) of 3G mobile systems is now a possibility as a result of the international IMT-2000 standardization effort. In November of 1999, a comprehensive set of radio interface specifications for IMT-2000 was approved. The five required interfaces enabling interoperability are IMT-DS (Direct Spread), IMT-MC (Multi-Carrier), IMT-TC (Time Code), IMT-SC (Single Carrier), and IMT-FT (Frequency Time). 3G field trials are currently underway with plans to begin commercial operation in 2001.
NIST has been involved in 3G systems since 1998. At that time, there were 16 radio technology proposals for IMT-2000. NIST WCTG selected two of the more promising proposals to follow, and began analysis and modeling. Those two proposals, UTRA (W-CDMA) and cdma2000, were selected in Nov. 1999 to make up three of the five IMT-2000 radio interfaces. NIST's role in this work is not going to be limited to 3G wireless systems. It will be an ongoing effort for next generations of wireless technology.
Saturday, June 13, 2009
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