IMT-2000

From Free net encyclopedia

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 Spread
  • also known as W-CDMA or UTRA-FDD, used in UMTS
• IMT-MC Multi-Carrier
  • also known as CDMA2000, the successor to 2G CDMA (IS-95)
• 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
• IMT-FT Frequency Time
  • also known as DECT

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 familyde:IMT-2000

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