High Speed Downlink Packet Access HSDPA is a 3G 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 allows
networks based on Universal Mobile
Telecommunications System (UMTS) to have higher data transfer speeds and
capacity. HSDPA implementations includes Adaptive Modulation and Coding (AMC),
Multiple-Input Multiple-Output (MIMO), Hybrid Automatic Request (HARQ), fast
cell search, and advanced receiver design
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High Speed Downlink Packet Access (HSDPA) is a 3G 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 allows
networks based on Universal Mobile
Telecommunications System (UMTS) to have higher data transfer speeds and
capacity. 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.
