IMT-2000

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IMT-2000 (International Mobile Telecommunications-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
  • IMT-MC Multi-Carrier
  • IMT-TD Time-Division
    • 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
    • also known as UWC, the best known implementation is EDGE
  • IMT-FT Frequency Time
    • also known as DECT

In January 2007 a proposed 6th air interface (IP-OFDMA) was submitted into ITU-R by the IEEE and supported by the WiMAX Forum. The technology is based on the IEEE 802.16e Standard. It is anticipated that this air interface will be an approved IMT-2000 technology later this year, 2007.

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