Question: In a CSG (Closed Subscriber Group) scenario, what technique can be employed to mitigate dominant interference from a CSG cell to non-member UEs served by a macro cell on the same frequency layer?
Option 1: Time domain ICIC (Inter-Cell Interference Coordination) using Almost Blank Subframes
Option 2: Frequency domain ICIC through carrier aggregation
Option 3: Handover of non-member UEs to a different RAT (Radio Access Technology)
Option 4: Power increase for the macro cell's downlink transmission
Explanation: Time domain ICIC using Almost Blank Subframes protects macro cell subframes from CSG cell interference, allowing non-member UEs to continue being served by the macro cell despite strong interference, effectively mitigating dominant interference without requiring changes in frequency layer or RAT for the affected UEs.