Question: In a UTRA FDD system, when a User Equipment (UE) is in soft handover, how are Transmit Power Control (TPC) commands received from different cells in the active set utilized?
Option 1: All TPC commands from different cells are averaged to determine the required uplink power step.
Option 2: The UE selects the TPC command from the cell with the strongest signal to determine the required uplink power step.
Option 3: TPC commands from different cells are ignored, and the UE relies on its internal power management to adjust uplink transmission power.
Option 4: TPC commands received in the same slot from different cells are combined according to a specified method to determine the required uplink power step.
Explanation: In soft handover scenarios, a UE can receive TPC commands from multiple cells simultaneously. To manage this, a method is dictated for combining these potentially disparate commands to ensure coherent power adjustment decisions. This approach ensures the UE can effectively integrate signals from all active set cells, maintaining optimal uplink transmission power levels. Combining TPC commands is crucial for balancing signal strength across the active set, ensuring reliable communication during soft handover.