4 Background and Introduction

25.3083GPPHigh Speed Downlink Packet Access (HSDPA)Overall descriptionRelease 17Stage 2TS

High Speed Downlink Packet Access is based on techniques such as adaptive modulation and hybrid ARQ to achieve high throughput, reduce delay and achieve high peak rates.

It relies on a new type of transport channel, the HS-DSCH, which is terminated in the Node B.

In FDD and 1.28Mcps TDD, the HS-DSCH reception is also supported in CELL_FACH, CELL_PCH and URA_PCH state.