W-CDMA, along with UMTS-FDD, UTRA-FDD, or IMT-2000 CDMA Direct Spread is an air interface standard found in 3G mobile telecommunications networks.
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12 Facts About W-CDMA
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W-CDMA systems are widely criticized for their large spectrum usage, which delayed deployment in countries that acted relatively slowly in allocating new frequencies specifically for 3G services.
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W-CDMA is the basis of Japan's NTT DoCoMo's FOMA service and the most-commonly used member of the Universal Mobile Telecommunications System family and sometimes used as a synonym for UMTS.
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W-CDMA has then become the dominant technology with 457 commercial networks in 178 countries as of April 2012.
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From an engineering point of view, W-CDMA provides a different balance of trade-offs between cost, capacity, performance, and density; it promises to achieve a benefit of reduced cost for video phone handsets.
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W-CDMA has been developed into a complete set of specifications, a detailed protocol that defines how a mobile phone communicates with the tower, how signals are modulated, how datagrams are structured, and system interfaces are specified allowing free competition on technology elements.
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Elsewhere, W-CDMA deployments are usually marketed under the UMTS brand.
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W-CDMA has been adapted for use in satellite communications on the US Mobile User Objective System using geosynchronous satellites in place of cell towers.
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UTRA-TDD HCR is closely related to W-CDMA, and provides the same types of channels where possible.
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Further, it is supposed to cover all usage scenarios, whereas W-CDMA is optimised for symmetric traffic and macro cells, while TD-CDMA is best used in low mobility scenarios within micro or pico cells.
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