HSUPA Category Definitions and Data Rates

- a summary of the different HSUPA categories, the HSUPA category definitions and the different data rates.

This 3G UMTS HSPA (HSDPA + HSUPA) and HSPA+ / Evolved HSPA tutorial is split into several pages:

In order to be able to cater for a number of variations in the level to which HSUPA is implemented, a number of different HSUPA categories have been defined. These HSUPA categories are equivalent in function to those used on the downlink, althought he actual parameters and speeds are naturally different.

The HSUPA categories allow for different levels of performance within the UE. The characteristics of the UE can then be easily communicated to the network which can then communicate with it in a suitable manner.

HSUPA category definitions

The HSUPA categories are detailed in the table below. This shows the different HSUPA categories with their data rates, and other required parameters.

Notes:
*A 10 ms TTI is supported in all categories
** Two E-DPDCHs at SF2 and two at SF4

Support for the E-DCH TTI (Transmission Time Interval) of 10 ms is required for all HSUPA categories. It is only some HSUPA categories that support a 2 ms TTI. Also the highest data rate supported with a 10 ms TTi is 2 Mbps. The reason for this is to limit the amount of buffer memory required in the NodeB for soft combining because a larger block transport size means that a larger soft buffer is needed for retransmissions.

Summary

The HSUPA category definitions are an integral part of the operation of the HSUPA scheme for improving the data rates over 3G UMTS. The HSUPA category definitions allow the NodeB to communicate with the individual UEs in an appropriate manner, thereby enabling the optimum use of te available capacity.

Further pages from this tutorial
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