Question: In a UTRA FDD network, during an inter-cell soft handover, what primarily determines the receive characteristics of the E-DCH Relative Grant Channel (E-RGCH) for a User Equipment (UE)?
Option 1: Signal strength from the Serving E-DCH cell only
Option 2: Combined signal strength from all visible cells
Option 3: The UE's transmit power capabilities
Option 4: Missed UP/DOWN error probabilities
Explanation: During an inter-cell soft handover in a UTRA FDD network, the UE receives signals from multiple cells, including both the Serving E-DCH cell and Non-serving E-DCH Radio Links (RL). The receive characteristics of the E-RGCH are crucial for the UE to correctly detect signaling from different cells. The primary determinant of these characteristics, in this context, is the missed UP/DOWN error probabilities, as they directly impact the reliability of the E-RGCH signaling detection across various cell signals. This highlights the importance of error probability management in maintaining robust communication during handovers.