Question: In accordance with Event A2 (Serving becomes worse than threshold) for a UE in an E-UTRA network, how are the units of measurement for `Ms` (measurement result of the serving cell) determined?
Option 1: Always in dB, regardless of the measurement type (RSRP, RSRQ, or RS-SINR)
Option 2: Dependent on the measurement type - dBm for RSRP, and dB for RSRQ and RS-SINR
Option 3: Expressed in dB for RSRP and RSRQ, but in dBm for RS-SINR
Option 4: Uniformly in dBm for all types (RSRP, RSRQ, and RS-SINR)
Explanation: The correct answer is based on the nuanced understanding of how measurement units are defined within the context of Event A2 for E-UTRA. Specifically, `Ms` is expressed in dBm when the measurement is based on RSRP, reflecting its power-based nature. Conversely, for measurements tied to RSRQ and RS-SINR, `Ms` is expressed in dB, aligning with their ratio or quality-based metrics.