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High Speed Downlink Packet Access (HSDPA) is a packet-based data service in W-CDMA downlink with data transmission up to 8-10 Mbps (and 20 Mbps for MIMO systems) over a 5MHz bandwidth in WCDMA downlink. HSDPA implementations includes Adaptive Modulation and Coding (AMC), Multiple-Input Multiple-Output (MIMO), Hybrid Automatic Request (HARQ), fast cell search, and advanced receiver design.

In 3rd generation partnership project (3GPP) standards, Release 4 specifications provide efficient IP support enabling provision of services through an all-IP core network and Release 5 specifications focus on HSDPA to provide data rates up to approximately 10 Mbps to support packet-based multimedia services. MIMO systems are the work item in Release 6 specifications, which will support even higher data transmission rates up to 20 Mbps. HSDPA is evolved from and backward compatible with Release 99 WCDMA systems.

Currently (2002) 3GPP is undertaking a feasibility study on high-speed downlink packet access.

HSPDA Comparison

HSPDA and CDMA2000 1xEV-DV Comparison

Further reading:

3GPP TS 25.855 High Speed Downlink Packet Access (HSDPA); Overall UTRAN description
3GPP TS 25.856 High Speed Downlink Packet Access (HSDPA); Layer 2 and 3 aspects
3GPP TS 25.876 Multiple-Input Multiple-Output Antenna Processing for HSDPA
3GPP TS 25.877 High Speed Downlink Packet Access (HSDPA) - Iub/Iur Protocol Aspects
3GPP TS 25.890 High Speed Downlink Packet Access (HSDPA); User Equipment (UE) radio transmission and reception (FDD)

Lucent announced the world's first turbo decoder chip for HSDPA UMTS terminals (11/02/03)

  UMTS Overview UMTS Network UMTS Frequencies UMTS Coding UMTS Link Budget
UMTS Security UMTS Codes Synchronisation Co-location
3G Data Speeds UTRA Time Slots UTRA Channels WCDMA Spreading
UMTS QoS Channel Coding Media Formats Compressed Mode
UMTS HSDPA UMTS Handovers Location Services UMTS Power Control
UMTS Overview Cell Search Random Access RCC States Iui Frame Structure
CDMA Overview Call Setup UTRAN Interfaces Paging Virtual Home Environment

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