Question: In UTRAN Iub interface NBAP signalling, what does the Power Offset Information Element (IE) define, specifically for Downlink transmission?
Option 1: An absolute power value for all downlink channels in Node B.
Option 2: A relative power offset to the Downlink transmission power of a DPDCH (or Secondary CCPCH data field), depending on Node B's configuration.
Option 3: A minimum required receive power for User Equipment (UE) at the cell edge.
Option 4: The maximum allowed transmission power for a Cell in Node B to prevent interference.
Explanation: This is correct because the Power Offset IE defines a relative offset - not an absolute value, nor does it pertain to minimum receive power for UE or maximum cell transmission power to prevent interference. Instead, it's about adjusting power relative to a base (DPDCH or Secondary CCPCH data field), depending on Node B's configuration.