HS-DSCH
High Speed Downlink Shared Channel

The HS-DSCH is evolved from the UMTS Release 99 DSCH (Downlink Shared Channel). It enables fast and flexible time multiplexing of different users. Its purpose is to increase data rates, as well as improve the spectral efficiency. DSCH features such as fast power control and variable spreading factor have been replaced in HS-DSCH Release 5, which instead utilizes: a short packet size, multi-code operation, as well as other techniques such as AMC (Adaptive Modulation and Coding)and HARQ.

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