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Technology Stocks : 4G - Wireless Beyond Third Generation
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From: waitwatchwander12/13/2006 9:49:32 AM
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TD-CDMA/TD-SCDMA

The UMTS standard also contains another radio transmission standard which is rarely mentioned: TD-CDMA (a.k.a. TDD UTRA because it is the TDD component of UTRA). TD-CDMA was developed by Siemens. While W-CDMA is an FDD technology (requiring paired spectrum), TD-CDMA is a TDD technology and thus can use unpaired spectrum (see the section on 3G Technology for an explanation of TDD and FDD). TDD is well-suited to the transmission of internet data (see the section on symmetric transmission vs. asymmetric transmission for an explanation).

China has more mobile phone users than any other country in the world, so anything China does in 3G cannot be ignored. The Chinese national 3G standard is a TDD standard similar to TD-CDMA: TD-SCDMA. TD-SCDMA was developed by the China Academy of Telecommunications Technology (CATT) in collaboration with Siemens. TD-SCDMA eliminates the uplink/downlink interference which affects other TDD methods by applying "terminal synchonisation" techniques (the "S" in TD-SCDMA stands for "synchronisation"). Because of this, TD-SCDMA allows full network coverage over macro cells, micro cells, and pico cells. Hence, TD-SCDMA stands alongside W-CDMA and CDMA2000 as a fully-fledged 3G standard. The 3GPP have extended the TD-CDMA standard to include TD-SCDMA as an official IMT-2000 standard.

Unfortunately, TD-SCDMA has performed poorly in trials, and Chinese network operators may prefer W-CDMA over TD-SCDMA.



Based on a presentation from the ITU. In many ways, it's almost TOO simple ...

three-g.net
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