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HSDPA (High Speed Downlink Packet Access)



HSDPA (High Speed Downlink Packet Access) is an enhanced compoment of WCDMA, itself the "Wideband" optimization of the widespread CDMA (2G) technology. WCDMA was one of the original 3G technologies implemented by the AT&T and T-Mobile networks, and initially produced speeds up to 384kbit/s. 

HSDPA is part of two-fold enhancement to the basic WCDMA technology (the other is HSUPA, and handles uplinked data). Initial download speeds were capped at a theoretical maximum of 1.8Mbit/s—a substantial improvement over 2G and pre-3G technologies. Improvements in the technology, and in handset radios and processesors, however, have led to incremental increases in theoretical speeds: 7.2, 10.1, 14.4, 21 and, finally, 42Mbit/s—a speed regularly termed 4G by phone manufactures and by carriers. 


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