Question: In a UTRA FDD network, during an inter-cell soft handover, what primarily determines the receive characteristics of the E-DCH HARQ ACK Indicator Channel (E-HICH) for a User Equipment (UE)?
Option 1: Missed ACK error probabilities
Option 2: Received Signal Strength Indication (RSSI) from serving cells
Option 3: Type of UE's supported Transmission Time Interval (TTI)
Option 4: Presence of High-Speed Downlink Packet Access (HSDPA)
Explanation: During an inter-cell soft handover, a UE receives signals from multiple cells, complicating the detection of E-HICH signalling. The primary factor influencing the receive characteristics of the E-HICH in this scenario is the missed ACK error probabilities, as it directly affects the reliability and accuracy of the acknowledgement reception, crucial for maintaining effective communication across different cells.