IMT-2000

'International Mobile Telecommunications-2000' ('IMT-2000') is the global standard for third generation (3G) wireless communications as defined by the International Telecommunication Union.
In 1999 ITU approved five radio interfaces for IMT-2000 as a part of the ITU-R M.1457 Recommendation. The five standards are:

★ ''IMT-DS Direct-Sequence''

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★ also known as W-CDMA or UTRA-FDD, used in UMTS

★ ''IMT-MC Multi-Carrier''

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★ also known as CDMA2000, the successor to 2G CDMA (IS-95)

★ ''IMT-TD Time-Division''

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★ This comprises: TD-CDMA (Time Division - Code Division Multiple Access) and TD-SCDMA (Time Division - Synchronous Code Division Multiple Access). Both are standardised by 3GPP in UMTS like UTRA TDD-HCR (3.84 Mcps, 5 MHz bandwidth, TD-CDMA air interface) and UTRA TDD-LCR (1.28 Mcps, 1.6 MHz bandwidth, TD-SCDMA air interface).

★ ''IMT-SC Single Carrier''

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★ also known as UWC-136, an evolution of the U.S. IS-136 TDMA standard. It supports channel bandwidths of 30 kHz, 200 kHz and 1.6 MHz.

★ ''IMT-FT Frequency Time''

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★ also known as DECT
On 31st May 2007 the ITU-R WP8F approved the introduction of a new air interface to the IMT-2000 family. WP8F agreed on the new name of OFDMA TDD WMAN (previously known as IP-OFDMA). The final ITU-R ratification is subject to SG8 approval in June 2007. The technology is based on the IEEE 802.16e Standard.

Contents

External links

External links

★ ITU home page for IMT-2000

★ About Mobile Technology and IMT-2000 A paper by ITU describing the various 3G standards in the IMT-2000 family