What is HSDPA?
High-Speed Downlink Packet Access (HSDPA) is a mobile telephony protocol, also referred to as 3.5G (or usually call it "the next step for 3G") technology, which provides a smooth evolutionary path for UMTS-based 3G networks allowing for higher data transfer speeds, up to 14.4 Mbit/s per cell in the downlink and 2 Mbit/s per cell in the uplink.
An evolution of the W-CDMA standard, HSDPA achieves the increase in the data transfer speeds by defining a new W-CDMA channel: a high-speed downlink shared channel (HS-DSCH) that operates in a different way from existing W-CDMA channels and is used for downlink communications to the mobile.
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