IMT-2000

IMT-2000 (International Mobile Telecommunications-2000) is the global standard for third generation (3G) wireless communications as defined by the International Telecommunication Union.^[1][2][3]

In 1999 ITU approved five radio interfaces for IMT-2000 as a part of the ITU-R M.1457 Recommendation.^[4] The five standards are:^[5]

• IMT-2000 CDMA Direct Spread
  • also known as W-CDMA, used in UMTS, the successor to GSM
• IMT-2000 CDMA Multi-Carrier
  • also known as CDMA2000, the successor to 2G CDMA (IS-95)
• IMT-2000 CDMA TDD
  • also known as TD-SCDMA
• IMT-2000 TDMA Single Carrier
  • also known as EDGE, an intermediate 2.5G technology
• IMT-2000 FDMA/TDMA
  • also known as DECT

To meet the IMT-2000 standards, a system must provide peak data rates of at 384 kbit/s for mobile stations and 2 Mbit/s for fixed stations.^{[2][6][7][8][9]}