Question: In E-UTRAN, when configuring a UE for time domain ICIC (Inter-Cell Interference Coordination) using Pattern 3, what is the primary purpose of defining two subframe subsets for CSI (Channel State Information) measurement?
Option 1: To enable simultaneous CSI reporting for multiple neighbor cells.
Option 2: To facilitate CSI measurements under different modulation schemes.
Option 3: To allow CSI measurements subject to varying levels of interference (e.g., ABS vs. non-ABS subframes).
Option 4: To reduce the frequency of periodic CSI reports.
Explanation: In the context of time domain ICIC and Pattern 3 configuration, defining two subframe subsets for CSI measurement enables the UE to report CSI under different interference conditions. This is crucial for effective interference mitigation, as it allows the network to understand and adapt to varying interference levels (e.g., Almost Blank Subframes (ABS) which have reduced or no traffic, versus non-ABS which may carry full traffic loads). This distinction aids in optimizing radio resource allocation and enhancing overall network performance.