Question: In a 5G NR network, according to 3GPP specifications, what condition must be met for a User Equipment (UE) to trigger the **leaving** of Event A1 ("Serving becomes better than threshold")?
Option 1: The measured serving cell value (`Ms`) plus hysteresis (`Hys`) equals the threshold (`Thresh`).
Option 2: The measured serving cell value (`Ms`) plus hysteresis (`Hys`) is less than the threshold (`Thresh`).
Option 3: The measured serving cell value (`Ms`) minus hysteresis (`Hys`) exceeds the threshold (`Thresh`).
Option 4: The measured serving cell value (`Ms`) equals the threshold (`Thresh`) without considering `Hys`.
Explanation: According to the specifications for Event A1 in 5G NR, the UE considers the leaving condition satisfied when the inequality `Ms + Hys < Thresh` is fulfilled. This means that for the UE to leave (or stop reporting) Event A1, the measured serving cell value (`Ms`) plus the hysteresis parameter (`Hys`) must be less than the defined threshold (`Thresh`). This condition ensures a buffer zone to prevent rapid triggering of events due to minor fluctuations in signal strength.