High-Speed Downlink Packet Access (HSDPA) is an enhanced 3G (third generation) mobile telephony communications protocol in the High-Speed Packet Access (HSPA) family, also coined 3.5G, 3G+ or turbo 3G, which allows networks based on Universal Mobile Telecommunications System (UMTS) to have ...
en.wikipedia.org/wiki/HSDPA

the latest protocol for the wireless high speed transmission of voice and data, with a maximum transmission speed rated at 14.4Mbps;
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HSDPA is a new mobile telephony protocol and is sometimes referred to as a 3.5G (or "3½G") technology. In this respect it extends WCDMA in the same way that EV-DO extends CDMA2000. ...
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A method for downloading data at very high speeds on UMTS/GSM networks. The theoretical maximum speed of currently deployed HSDPA systems is 14.4 Megabits per second, and it is currently the fastest available technology for data flows over UMTS networks. Click here for more information on HSDPA.
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Packet-based protocol that enhances data rates in UMTS networks and lifts transmission speeds into the megabit range.
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High Speed Downlink Packet Access. This is a 3.5G technology data transfer protocol. It is supposed to be an enhancement to the WCDMA technology, which is considered to be a 3G technology protocol. It allows high speeds (up to 8Mbps) of downloading content from the network.
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High Speed Downlink Packet Access. This is the newest type of 3G mobile network. HSDPA allows the end user to receive data at up to 14.4Mbps. That's as fast or faster than many wired broadband connections.
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High Speed Downlink Packet Access: The further development of the third-generation UMTS mobile communications technology. The maximum transfer speed for data reception which can be achieved is currently at 3.6 Mbit/s. ...
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