High-Speed Downlink Packet Access or HSDPA is a mobile telephonyprotocol. Also called 3.5G (or "3½G"). High Speed Downlink Packet Access (HSDPA) is a packet-based data service in W-CDMA downlink with data transmission up to 8-10 Mbit/s (and 20 Mbit/s 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 Mbit/s 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 Mbit/s. HSDPA is evolved from and backward compatible with Release 99 WCDMA systems.
HSDPA is part of release 5 UMTS networks, which also accompanies an improvement on the uplink providing a new bearer of 384 kbit/s (previous max bearer was 128 kbit/s).
KTF launched commercial HSDPA service for phone by June 30, 2006 in 40 cities of South Korea, which expecting to be up to all 84 cities by end of year 2006.
Vodacom was the first to deploy HSDPA commercially in South Africa becoming the 14th network world-wide to deploy HSDPA which created some kind of a battle between the two networks who have become renowned for their fierce competition in the mobile broadband space to be the first to launch new and innovative technologies and services.
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