HSDPA (High-Speed Downlink Packet Access)


HSDPA, short for High-Speed Downlink Packet Access, is a new protocol for mobile telephone data transmision. It is known as a 3.5G technology. This standard will provide download speed on a mobile device equivalant to ADSL(Asymmetric Digital Subscriber Line) line in a home. HSDPA is an evolution or improvement on W-CDMA (Wideband Code Division Multiple Access), a 3G protocol. HSDPA improves the data tranfer rate by a factor of at least five over W-CDMA. Theoretical data transmission speed of HSDPA is 8 to 10 Mbps. HSDPA provide higher data transfer speeds and capacity with networks based on Universal Mobile Telecommunications System (UMTS).

In India any BSNL(Bharat Sanchar Nigam Ltd) 3G coverage area, the network is based on UMTS and it support HSDPA.

For HSDPA, a new transport layer channel, High-Speed Downlink Shared Channel (HS-DSCH), has been added to W-CDMA. It is implemented by adding three new physical layer channels:
(i) HS-SCCH (High Speed-Shared Control Channel)
(ii) HS-DPCCH (High Speed-Dedicated Physical Control Channel)
(iii) HS-PDSCH (High Speed-Physical Downlink Shared Channel)

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