Sign in Subscribe

IRAT Handover From UTRAN Complete

Last updated on 


In mobile communication networks, "IRAT Handover from UTRAN Complete" refers to a message or signal that signifies the successful completion of an Inter-Radio Access Technology (IRAT) handover from UTRAN (Universal Terrestrial Radio Access Network) to another radio access technology, such as LTE (Long-Term Evolution) or 5G. This completion message is a critical part of the handover procedure, confirming that the handover has been successfully executed, and the user equipment (UE) is now connected to the target network. Let's delve into the technical details of this completion process:

  1. Trigger for IRAT Handover:The trigger for IRAT handover typically arises when the UE moves from an area covered by UTRAN (e.g., 3G) to an area covered by another radio access technology (e.g., LTE, 5G).
  2. Target Radio Access Technology Selection:Based on network policies and UE capabilities, a suitable target radio access technology is selected for the handover.
  3. Handover Preparation:The network initiates preparations for the handover by configuring resources and signaling necessary for a smooth transition to the target radio access technology.
  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 Execution:At the designated timing, the UE's connection is switched from UTRAN to the target radio access technology.
  6. Handover Completion at UTRAN:UTRAN performs necessary actions to finalize the handover, release resources, and complete the handover procedure.
  7. IRAT Handover from UTRAN Complete Message Generation:Once the handover is completed successfully, UTRAN generates the "IRAT Handover from UTRAN Complete" message.
  8. Confirmation of Handover Completion:The message confirms that the UE has successfully completed the handover to the target radio access technology.
  9. Transmission to UE:The "IRAT Handover from UTRAN Complete" message is transmitted from UTRAN to the UE over the appropriate signaling channels.
  10. UE Processing of Completion Message:The UE processes the "IRAT Handover from UTRAN Complete" message, acknowledging the successful completion of the handover from UTRAN.
  11. Communication Resumption:Normal communication between the UE and the target radio access technology is resumed.

This completion message plays a crucial role in handover procedures, ensuring that the UE and the network are in sync regarding the successful handover from UTRAN to another radio access technology. It is a critical step in maintaining seamless communication during transitions across different radio access technologies in mobile networks.