| cause value | S1AP cause  | Meaning  | 
Unspecified  | Sent for radio network layer cause when none of the specified cause values applies.  | |
TX2RELOCOverall Expiry  | The timer guarding the handover that takes place over X2 has abnormally expired.  | |
Successful Handover  | Successful handover.  | |
Release due to E-UTRAN generated reason  | Release is initiated due to E-UTRAN generated reason.  | |
Handover Cancelled  | The reason for the action is cancellation of Handover.  | |
Partial Handover  | Provides a reason for the handover cancellation. The HANDOVER COMMAND message from MME contained E-RABs to Release List IE and the source eNB estimated service continuity for the UE would be better by not proceeding with handover towards this particular target eNB.  | |
Handover Failure In Target EPC/eNB Or Target System  | The handover failed due to a failure in target EPC/eNB or target system.  | |
Handover Target not allowed  | Handover to the indicated target cell is not allowed for the UE in question.  | 
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