Question: What is the primary purpose of the `crs-IntfMitig-r15` field in UE radio access capabilities, as related to E-UTRA specifications?
Option 1: To indicate UE support for enhanced Cell Identity (CI) detection
Option 2: To signify UE capability for advanced Handover (HO) procedures
Option 3: To define whether the UE supports CRS (Cell-Specific Reference Signal) interference mitigation
Option 4: To determine UE compatibility with specific E-UTRA frequency bands
Explanation: The correct answer, Option 3, accurately reflects the purpose of the `crs-IntfMitig-r15` field. This field is specifically used to indicate whether a User Equipment (UE) supports Cell-Specific Reference Signal (CRS) interference mitigation techniques. These techniques are crucial for managing and reducing interference within cellular networks, ensuring better overall network performance and user experience. The other options are incorrect as they pertain to different aspects of E-UTRA specifications not directly related to the `crs-IntfMitig-r15` field's defined purpose.