Sign in Subscribe

Handover From E-UTRA Preparation Failure

Last updated on 


In LTE (Long-Term Evolution) mobile communication networks, "Handover from E-UTRA Preparation Failure" refers to a situation where the preparation for a handover procedure from one eNodeB (E-UTRAN Node B) to another has failed. This failure can occur due to various reasons, disrupting the smooth transition of the User Equipment (UE) from the source cell to the target cell. Let's delve into the technical details of this failure scenario:

  1. Trigger for Handover:The trigger for a handover can be a deteriorating radio link quality, a need for load balancing, or a change in UE location requiring a switch to a more optimal eNodeB.
  2. Target Cell Selection:Based on the measurement reports and other network parameters, a suitable target cell (eNodeB) is chosen for the handover.
  3. Handover Preparation:The network initiates preparations for the handover by configuring resources and signaling necessary for a smooth transition.
  4. Handover Type and Parameters:The network decides the type of handover (e.g., soft handover, hard handover) and sets related parameters such as handover priority, timing, and thresholds.
  5. Handover Command Generation:The source eNodeB generates a "Handover from E-UTRA Command" message, including information about the target cell and handover parameters.
  6. Transmission to UE:The "Handover from E-UTRA Command" message is transmitted to the UE over the air interface (e.g., via PDCCH - Physical Downlink Control Channel).
  7. UE Processing of Handover Command:The UE processes the received "Handover from E-UTRA Command" message, extracting the details about the target cell and handover instructions.
  8. Handover Preparation Failure:For various reasons such as insufficient resources, conflicts, or authentication issues, the preparation for the handover may fail at either the source or target eNodeB.
  9. Preparation Failure Indication:The network sends a "Handover from E-UTRA Preparation Failure" message to the UE, indicating the failure to prepare for the handover.
  10. UE Handling of Preparation Failure:The UE processes the indication, takes appropriate action based on the failure cause, and may notify the network of the failure.
  11. Alternative Actions:Depending on the nature of the failure, the UE or the network may initiate alternative actions, such as attempting the handover again, selecting a different target cell, or switching to another communication mode.

Resolving "Handover from E-UTRA Preparation Failure" is essential to ensure successful handover procedures, maintain seamless connectivity, and optimize network performance in LTE mobile networks. Efficient handovers are critical for providing uninterrupted services and enhancing the overall user experience.