Question: During an inter-cell soft handover in a UTRA FDD network, what primarily determines the receive characteristics of the E-DCH HARQ ACK Indicator Channel (E-HICH) for a User Equipment (UE)?
Option 1: Signal strength from the Serving E-DCH cell
Option 2: Type of UE's supported release (e.g., Release 7 or later)
Option 3: Number of cells involved in the soft handover
Option 4: Missed ACK error probabilities
Explanation: In inter-cell soft handover, a UE receives signals from multiple cells, complicating E-HICH signalling detection. The primary factor influencing E-HICH receive characteristics is the missed ACK error probabilities, directly impacting HARQ process reliability and efficiency, which relies on accurate ACK/NACK feedback to function correctly.