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 - also known as 3.5G. 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.
To enjoy the faster data speed such as HSDPA or HSUPA, user devices such as USB modem, 3G router also need to be complied with this HSDPA and HSUPA technology.
HSDPA means, faster download speed from internet to your computer,speed may vary due certain condition from 1.8 Mbps, 3.6 Mbps and up to maximum 7.2 Mbps
HSUPA means, faster upload speed from your computer to internet up to 2 Mbps.
picture taken from unicaen.fr
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