High Speed Downlink Packet Access
HSDPA is a protocol for the mobile telephony sometimes called 3,5 G or 3G+ (trade description).
The protocol 3,5 G offers performances ten times higher than the 3G (UMTS R' 99) of which it is a software evolution. This evolution makes it possible to approach the performances of the networks DSL (digital subscriber line).
This technology makes it possible to download with a flow of 1.8 Mbit/s, 3.6 Mbit/s, 7.2 Mbit/s and 14.4 Mbit/s.
The HSDPA is founded on technology HSDPA (High Speed Downlink Packet Access), downward bond of the network towards the terminal with High banc in packages mode. The UMTS (the 3G) is defined by the Norme WCDMA - 3GPP Rel. 99 (Wideband-Code Division Multiple Access - 3rd Generation Partnership Project Release 99). The HSDPA is defined in the version WCDMA - 3GPP Rel. 5 .
In France, the 3,5G is available under the name of 3G+ in June 2006 on the network SFR and with the autumn 2006 at Orange. Bouygues Telecom, which did not deploy a network UMTS, will deploy directly its network in HSDPA in April 2007, at the last possible date of the terms of its license UMTS.
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