Like other 3G standard, TD-SCDMA also evolves to provide the HSDPA solution defined in the 3GPP R5 version standard. The TD-SCDMA 3GPP R5 specifications adopt new technologies such as AMC (automatic modulation and coding) and HARQ (Hybrid Automatic Repeated Request) to better meet the requirements of high speed mobile data services. It also uses 16QAM, a highly efficient new modulation mode that can increase the single-carrier data transmission speed up to 2.8Mbps and considerably boosts the spectrum efficiency and the capacity of the TD-SCDMA network, compared with QPSK, the modulation mode used in 3GPP R4 version.
HSDPA is an important 3GPP Release 5 feature designed to better facilitate mobile web access and video streaming applications through the provision of broadband data rates and can best demonstrate TD-SCDMA’s competitiveness as the most suitable 3G technology to deliver Internet applications characterized by asymmetric traffic requirements. Hence, the implementation of TD-SCDMA HSDPA infrastructure and terminal at the commencement of global commercial HSDPA services is of strategic importance to increase the completive advantages of TD-SCDMA, and to accelerate the rapid growth of the 3G mobile market.
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