Question: In UTRAN's Iub interface (NBAP signalling), what does the 'Maximum DL Power Capability' parameter signify for a local cell within Node B, considering its reference point and impact of Transmit Diversity?
Option 1: The minimum required uplink power for successful handovers to adjacent cells.
Option 2: The total downlink bandwidth allocated to all UEs within the cell.
Option 3: The maximum linear sum of downlink power (at the antenna connector) usable across all branches when Transmit Diversity is employed.
Option 4: The average noise floor level at the cell edge, influencing coverage area calculations.
Explanation: This correct answer reflects a nuanced understanding of the 'Maximum DL Power Capability' parameter. It accurately captures the essence of the parameter's meaning within Node B, specifically highlighting its reference to the antenna connector and the aggregation of power across all branches when Transmit Diversity is utilized, which enhances signal quality and capacity.