TRAN (Evolved Universal Terrestrial Radio Access Network). The measurements performed on the secondary cell or neighboring cells concern the following values: - for the 5G cell, the SSB-RSRP power level measured at the level of the SSB, the CSI-RSRP power level and the RSRQ quality level measured on the reference signal; - for the 4G cell, the RSRP level and the RSRQ level measured on the reference signal. 9.3.2. The measurement events 9.3.2.1. The A1 event The A1 event occurs when the measurement of the signal received from the serving cell becomes greater than that of a threshold: Ms - Hys > Thresh where: - Ms is the measurement of the signal received on the server cell; - Hys is the hysteresis parameter relating to this event; - Thresh is the threshold relating to this event. The A1 event is stopped when the measurement of the signal received from the serving cell becomes less than that of a threshold: Ms + Hys < Thresh. Example of use: the A1 event can be used to cancel a handover procedure. 5G-NR Radio Interface - Radio Access Procedure 257 9.3.2.2. The A2 event The A2 event occurs when the measurement of the signal received from the serving cell falls below that of a threshold: Ms + Hys < Thresh. The A2 event is stopped when the measurement of the signal received from the serving cell becomes greater than that of a threshold: Ms - Hys > Thresh. - Example of use: the A2 event can be used to trigger a mobility procedure when the mobile is in a cell device. 9.3.2.3. The A3 event The A3 event occurs when the measurement of the signal received from the neighboring cell is greater than that of the SpCell (Special Cell): Mn + Ofn - Hys >Mp+Ofp+Ocp+Of where: - Mn is the measurement of the signal received from the neighboring cell; - Ofn is the specific offset related to the frequency of the neighboring cell; - Ocn is the specific offset related to the neighboring cell; - Mp is the measurement of the level received on the primary channel SpCell of the serving cell. In the case of dual connectivity, the SpCell channe