Question: What condition must be fulfilled for a UE to consider entering Event H2, where the Aerial UE altitude becomes lower than a threshold?
Option 1: Ms + Hys > Thresh
Option 2: Ms - Hys < Thresh
Option 3: Ms + Hys < Thresh
Option 4: Ms - Hys > Thresh
Explanation: According to the specifications, Inequality H2-1 (Entering condition) is fulfilled when Ms + Hys < Thresh. This means that for a UE to consider entering Event H2, the sum of its aerial altitude relative to sea level (Ms) and the hysteresis parameter (Hys) must be less than the threshold parameter (Thresh).