Introduction to HSDPA Usage in 3g Technology Electronics Seminar Topic:
Introduction:
In order to meet the growing network demands 3G technology has come into existence. It has additional features like video calling, fax and TV streaming and high speed web. It has a browsing speed of about 144-2mbps. In 3G WCDMA technique is employed which allows multiple users on a common carrier signal. As the number of users increases the traffic in downlink increases which reduces the bandwidth capacity. In order to reduce the downlink traffic HSDPA technique is employed.
Brief into HSDPA:
Wideband code division multiple access is capable of supporting transmission speeds up to 2mbps. But as the downlink traffic gets increased the capacity of the bandwidth gets reduced. To overcome this high speed downlink shared channel technique is used. It employs time multiplexing method and uses a same transport channel for transmission. To minimize the air interference load due to re transmissions in employs incremental redundancy method. Depending upon the quality of the radio link it adapts the coding and modulation scheme. The HSDPA consists of three layers. The data transfer to the higher layers is made through physical layer. The services can be accessed through medium access layer. Here the data is divided into slots and transmitted over the network. A timing and delay feedback is provided to minimize the delay occurring which is about 3 subframes.
Advantages:
By using this technique we can increase the capacity of the downlink speed. This increases the performance of the network. As the signal is transmitted on a common channel the need to employ additional channels is not required. Thus we can conclude that HSDPA technique is the most extensively used technique in various networks for increasing network performance.
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