High-Speed Downlink Packet Access (HSDPA)

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High Speed Downlonk Packet Access is a 3.5G [G stands for generation] technology. HSDPA, short for High Speed Downlink Package Access is a new new mobile telephony protocol, which allows to have high data speed transmission and large amounts of capacity. It will provide download speed on a mobile phone same as an Asymmetric Digital Subscriber Line [ADSL]. HSDPA can archieve data transmission Speed of 8-10 Mbit/s. For future improvement, HSDPA provides up to 42Mbit/s data transmission speed.


Contents

Technology

High Speed Downlink Packet Access technology is based on Universal Mobile Telecommunications System [UMTS] standard that enhances the capabilities of 3G by enabling higher data transfer rates. Since HSDPA is using High Speed Downlink Shared Channel, it has two weak points; variavle spreading factor and fast power control. Therefore, HSDPA implementations includes Multiple-Input Multiple-Output (MIMO), Hybrid Automatic Request (HARQ), fast cell search, Adaptive Modulation and Coding (AMC), and advanced receiver design.

          Image:HSDPA_Share.jpg              Image:HSDPA_Structure.jpg

Multiple-Input Multiple-Output

Adaptive Modulation and Coding

Hybrid Automatic Request

Packet Scheduling

Usage

Testing

Image:HSDPA_usage.gif


Comparison

orz

Image:HSDPA_Speed.gif


See Also

Reference

External Links

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