IMT-2000, or International Mobile Telecommunications 2000, is a third generation mobile phone standard. It is the successor to the second generation GSM standard and was designed to provide higher data rates and improved spectral efficiency. IMT-2000 is a family of standards that includes both wideband CDMA (WCDMA) and time division duplexing (TDD) technologies.
IMT-2000 was first proposed in 1997 by the International Telecommunication Union (ITU), an international body that regulates telecommunications. The original proposal called for a single global standard for 3G mobile technology, but this was not achievable due to disagreements between different countries and regions. As a result, IMT-2000 has been implemented as a set of regional standards, with WCDMA being used in Europe, Japan, Korea and China; TDD being used in North America; and other technologies such as CDMA2000 being used in other parts of the world.
Despite its name, IMT-2000 does not specify any particular air interface or radio access technology. Instead, it defines requirements that must be met by any 3G system wishing to be considered compliant with the standard. These requirements include support for high data rates (up to 2 Mbps), increased spectral efficiency (compared to GSM), enhanced voice quality (using speech codecs such as AMR or EVRC), support for multimedia applications (including video call capability),and seamless roaming across different networks types.
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