A2: This event is triggered to indicate eNodeB that UE detects serving cell strength worst than the configured threshold. In other words, UE is going far way from cell centre or the event is triggered when the following condition is true:
MEAsserv + Hyst < Threshold
Triggering of the event is subsequently cancelled when the following condition is true.
MEAsserv - Hyst > Threshold
The hysteresis can be configured with a value between 0 and 30 dB.
A3: The LTE Event A3 is triggered when a neighbouring cell becomes better than the serving cell by an offset. The offset can be either positive or negative. The event is triggered when the following condition is true:
MEASneigh + Oneigh,freq + Oneigh,cell - Hyst > MEASserv + Oserv,freq + Oserv,cell + Offset
MEASneigh + Oneigh,freq + Oneigh,cell + Hyst < MEASserv + Oserv,freq + Oserv,cell + Offset