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.
Example Usage of High-Speed
JohnHinnant: We think we had a shot fired in the vicinity if the Village Market and afterca high speed chase we caught the guys we think fired the shot.
seanizzle: Thank god, Windows Live is done. Praise you high speed internet.
zachmoree: damn! there was just a crazy high speed wreck outside of cola hall!
