By Harri Holma
For everybody that experience acquired WCDMA for UMTS, this publication is recomended for subsequent reading.
This ebook conceal boost knowing approximately subsequent technolgy evolution, HSPA.
History approximately standardization in first bankruptcy provide a very good info for intensity wisdom concerning the tale at the back of typical and subsequent improvement.
I recommendation for everyone that paintings in Telecommunication, comparable to RF Engineer, RF supervisor, Radio Technical revenues and Pre-Sales, procedure Engineer and pupil to learn this book.
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Additional resources for HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications
Sample text
The work was partly slowed down by the parallel corrections activity needed for the Release 99 terminals and networks being rolled out. Especially with protocol aspects, intensive testing tends to reveal details that need corrections and clarifications in the specifications and this was the case with Release 99 devices preceding the start of commercial operations in Europe in the second half of 2002. The longest time was taken for HSDPA protocol parts, on which backward compatibility was started in March 2004.
6 Terminal with 2 RX antennas and MIMO decoding capability MIMO principle with 2 transmit and 2 receive antennas. For Release 7 a work item has been defined, titled ‘continuous connectivity for packet data users’, aiming for reduced overhead during services that require maintaining the link but do not have the necessary continuous data flow. An example of such a service would be the packet-based voice service, often known as ‘Voice over IP’ (VoIP). What is being worked with currently can be found in [6], but conclusions are yet to be drawn as to what actually will be included in Release 7 specifications.
Radio link control (RLC) handles the segmentation and retransmission for both the user and control data. RLC may be operated on three different modes: . Transparent mode, when no overhead is added due to the RLC layer, such as with AMR speech, and is not applicable when the transport channels of HSDPA and HSUPA are used. Unacknowledged mode, when no RLC layer retransmission will take place. This is used with applications that can tolerate some packet loss, as is the case with VoIP, and cannot allow delay variation due to RLC level retransmission.