LTE: What does mean by implicit detach procedure at MME ?

Question

When target eNodeB is not able to allocate resource for all the bearers which comes as part of Handover Request message, it sends handover request ack with partial success since "E-RABs Failed to Setup List" is present in HOReqAck message.
What MME or source eNodeB does in that case ? Does any action taken by MME for the E-RABs which failed to setup at target eNodeB or some other actions taken ?

Answer 1

When MME not able to communicate with the UE because of poor radio link quality (radio link failure)
At this stage MME doesn’t send detach request or doesn’t inform to UE about detach, it implicitly detaches