Siemens strengthens its worldwide position by further development in TD-SCDMA

date: July 12, 2001

Siemens announces further development of TDD (Time Division Duplex) radio technology for 3G/UMTS. Siemens and NEC will observe the recommendations of the international standardization body 3GPP and unify their TDD-based solutions with the TD-SCDMA (Time Division - Synchronous Code Division Multiple Access) radio technology, which was developed in with CATT (China Academy of Telecommunications Technology). At the same time, Siemens and NEC will continue to act as a driving force with W-CDMA radio technology. By doing so, Siemens and NEC promote the global standardization of products and solutions. Apart from WCDMA, Siemens and NEC will also offer TDD in Asia and Europe as an extended and harmonized standard for 3G/UMTS.

China is set to launch a large-scale field trial to test its home-grown 3G technology, TD-SCDMA (Time Division Synchronous Code Division Multiple Access), starting in October this year, a source told 3G Newsroom.

Within the radio network for UMTS, known as UTRA (Universal Terrestrial Radio Access), TDD as well as FDD is worldwide accepted as a universal standard for 3G/UMTS. For that reason many network operators in several European countries have already been granted UMTS radio licenses for TDD.

In March 2001, the 3GPP agreed upon the worldwide harmonization and extension of the TDD performance spectrum. Additional features of TD-SCDMA radio technology jointly developed by Siemens and CATT were also included in the specifications for this 3G/UMTS standard.

Siemens has already demonstrated the general performance capacity of TDD technology at numerous fairs as well as during test operations with customers. With its data rates of up to 2.0 Mbit/s, this 3G/UMTS technology is particularly suited for asymmetrical data traffic with a highly efficient exploitation of the radio frequencies. Furthermore, the special features of TDD considerably facilitate the inclusion of IP technology.

Compared to the Europe-supported W-CDMA standard and the Qualcomm-backed cdma2000 technology, TD-SCDMA allows operators to build a 3G network at a comparatively low cost and to utilize 3G spectrum more efficiently, with technologies like smart antennas, joint detection and up-link synchronization.

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