When error indication message will be sent from eNB1 To eNB2 and please tell test procedure how to check this?

Question

How to inform MME about UE movement from Source eNB to Target eNB after UE sending Re-establishment with HO failure to target eNB during handover. In this case HO notify or path switch is applicable ?

Answer 1

Error Indication message is sent by eNodeB, which receives a message from another eNodeB over X2 link and it is not able to map to it's/UE context. For example: When source eNodeB receives "Handover Request Acknowledge" message for an UE from target eNodeB and source eNodeB is not able to map/find UE context based on the received "Old eNodeB Ue X2AP Id" IE, it responds to target eNodeB with "Error Indication" message along with appropriate cause.