Question: What is the minimum number of total carrier frequency layers a UE supporting E-UTRA measurements in RRC_IDLE state must be capable of monitoring, considering all possible combinations (NR, E-UTRA FDD, E-UTRA TDD)?
Option 1: At least 7 carrier frequency layers
Option 2: At least 10 carrier frequency layers
Option 3: At least 12 carrier frequency layers
Option 4: At least 14 carrier frequency layers (including the serving layer)
Explanation: According to UE measurement capability specs in idle mode, a UE supporting E-UTRA measurements in RRC_IDLE state must monitor a minimum number of carrier frequency layers across all combinations of NR, E-UTRA FDD, E-UTRA TDD, including the serving layer, for seamless cell re-selection.