Question: In UTRAN Iub interface NBAP signalling, what does the DL Power IE indicate when Transmit Diversity is applied to a downlink physical channel in FDD mode?
Option 1: The absolute power level of the primary CPICH.
Option 2: The power offset between the combined power on all branches for the physical channel and the primary CPICH power.
Option 3: The maximum allowed power for the downlink physical channel without considering cell configuration.
Option 4: The power reduction factor for each branch due to Transmit Diversity.
Explanation: In FDD mode, with Transmit Diversity applied, the DL Power IE indicates how much more or less power is allocated for the linear sum of the power on all branches of this downlink physical channel compared to the baseline primary CPICH power, aiding in managing and optimizing power distribution across channels.