High-Speed Downlink Packet Access (HSDPA)

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Revision as of 07:35, 12 April 2009

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 1 Technology 1.1 Multiple-Input Multiple-Output 1.2 Adaptive Modulation and Coding 1.3 Hybrid Automatic Request 1.4 Packet Scheduling 2 Usage 3 Comparison 4 See Also 5 Reference 6 External Links

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.

Multiple-Input Multiple-Output

Adaptive Modulation and Coding

Hybrid Automatic Request

Packet Scheduling

Usage

Testing

Comparison

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See Also

Reference

External Links