TD-SCDMA was a variant of UMTS WCDMA that was developed in China and used TDD techniques to provide some key advantages.
TD-SCDMA is a time division duplex, TDD version of UMTS that was developed in China and offered some key advantages as a TDD version. TD-SCDMA standards for Time Division - Synchronous CDMA.
Although different to the more standard TDD version of UMTS, TD-SCDMA was adopted by 3GPP and was included in the 3GPP standards as an accepted version of UMTS.
Much of the work to develop TD-SCDMA was undertaken by China Academy of Telecommunications Technology (CATT).
TD-SCDMA offers the advantages of the of any TDD system, but also was designed to incorporate many new technologies including joint detection, adaptive antennas, and dynamic channel allocation.
Although TD-SCDMA was never deployed outside China, it promoted the advantages of TDD systems and enabled 4G LTE push forwards the TDD versions of 4G LTE.