A new transport channel type is introduced Enhanced Dedicated Channel (E-DCH). It can be configured with one or several DCHs.
Introduction of 2ms TTI for efficient packet-data support. It allows for rapid adaptation of transmission parameters and reduction of the end-user delays associated with packet-data transmission.
But for large cells a longer TTI may be beneficial as the payload in a 2ms TTI can become unnecessarily small and the associated relative overhead too large. Hence the E-DCH supports two TTI lengths, 2 and 10ms and the network can configure the appropriate value.
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