Tuesday, November 8, 2011

HSDPA Basics

HSDPA is an improvement of  best-effort packet data on the DL in WCDMA in terms of speed, capacity and end user performance.

Higher bit rates up to 14 Mbps and system throughput which is 2-3 times higher than WCDMA Release 99.

End user performance is also improved by means of reduced Round Trip time  and higher bit rates.
HSDPA is standardized. The current WCDMA is extended by HSDPA in Release 5 of 3GPP specifications. Mainly,  a new DL transport channel is introduced that enhances support for interactive, background and, to some extent, streaming services and some powerful RRM functionality is introduced.

In a WCDMA network, it is possible not to upgrade all cells with HSDPA functionality since we have mobility between HSDPA and non HSDPA cells.

 We don’t need a separate carrier for HSDPA. Voice and data on the same.

We have simultaneous use of high speed packet data bearers and conversational bearers.

The basic RAN architecture supports HSDPA. The only need is to have some additional HW in RBS and additional SW for both RBS, RNC and RXI nodes.

All of these make a smooth and cost-efficient upgrade to HSDPA possible.  


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