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-Sequencealso known as
W-CDMA or UTRA-FDD, used in
UMTSIMT-MC Multi-Carrieralso known as
CDMA2000, the successor to
2G CDMA (
IS-95)IMT-TD Time-DivisionThis 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 Carrieralso known as
EDGEIMT-FT Frequency Timealso known as
DECT
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IMT-2000
IMT-2000
Unter dem Namen "IMT-2000" (International Mobile Telecommunications-2000) wurden in den späten
1980er Jahren die Anforderungen der
ITU-R (Radiokommunikationssektor der
International Telecommunications Union) an ein
Mobilfunksystem der dritten Generation (3G-Mobilfunksystem) zusammengefasst. Erfüllt wurden diese Anforderungen von den drei Standards
UMTS,
CDMA2000 und UWC-136. IMT-2000 ging aus dem Standard "Future Public Land Mobile Telecommunication System" (FPLMTS) hervor.
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第三世代携帯電話
IMT-2000
Telecomunicaciones móviles internacionales 2000 (IMT-2000) es el estándar global para las comunicaciones sin hilos de
3G, definidas por un sistema de recomendaciones interdependientes de la
Unión Internacional de Telecomunicaciones, ITU. IMT-2000 proporciona un marco para el acceso mundial sin hilos ligando los sistemas diversos de redes terrestres y redes satelitales.
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