Question: What is a prerequisite for a User Equipment (UE) to support CSI-RS (Channel State Information Reference Signal) based discovery signals measurement in an E-UTRA network?
Option 1: The UE must support only LTE TDD mode.
Option 2: The UE must have a specific frequency band allocated for CSI-RS measurements.
Option 3: The UE must also support crs-DiscoverySignalsMeas-r12 (Cell-specific Reference Signal based Discovery Signals Measurement).
Option 4: The UE needs to be in RRC_CONNECTED state at all times.
Explanation: According to the specifications, for a UE to support CSI-RS based discovery signals measurement, it is mandatory that the UE also supports crs-DiscoverySignalsMeas-r12. This ensures compatibility and comprehensive signal measurement capabilities within the E-UTRA network, enhancing overall network performance and user experience.