HSDPA (High-Speed Downlink Packet Access) is a packet-based mobile telephony protocol used in 3G UMTS radio networks to increase data capacity and speed up transfer rates. HSDPA, which evolved from the WCDMA standard, provides download speeds at least five times faster than earlier versions of UMTS, allowing users of HSDPA networks a broader selection of video and music downloads. HSPDA specifies data transfer speeds of up to 14.4 Mbps per cell for downloads and 2 Mbps per cell for uploads. In practice, users are more likely to experience throughput speeds of 400-700 Kbps, with bursts of up to 1 Mbps.
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In the United States, Cingular has a 3G/HSDPA network called BroadbandConnect. Cingular competes with Verizon Wireless and Sprint, which use a different 3G technology for broadband called EV-DO. One of the primary differences between HSDPA and EV-DO networks is that HSDPA allows mobile handsets to transmit voice and data simultaneously.