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NR-IRAT Handover From UTRAN Complete

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In 5G New Radio (NR), the "NR-IRAT Handover From UTRAN Complete" is a technical term used to describe an event that occurs during the process of handing over a User Equipment (UE) or device from a UTRAN (Universal Terrestrial Radio Access Network), which is associated with older-generation cellular technologies like UMTS (Universal Mobile Telecommunications System), to a 5G NR network. This handover is part of Inter-RAT (Radio Access Technology) handover, which allows a UE to move between different radio access technologies. Here's a technical explanation of this event:

Context: Inter-RAT Handover:

  • Inter-RAT handover, also known as a technology handover or handoff, is a procedure that enables a UE to transition between different radio access technologies, such as UTRAN (UMTS) and 5G NR.

Handover Preparation:

  • Before initiating the handover process, the UE in UTRAN needs to prepare for the transition to the 5G NR network. This preparation involves configuring its radio parameters, including frequency, timing, and other relevant settings, to align with the target 5G NR cell.

NR-IRAT Handover From UTRAN Request:

  • The "NR-IRAT Handover From UTRAN Complete" event occurs after the UE has successfully prepared for the handover. The UE sends a request to UTRAN, indicating that it is ready to perform an inter-RAT handover to a 5G NR cell.
  • This request typically includes information about the target 5G NR cell, such as its frequency band and cell identity.

Source UTRAN Processing:

  • Upon receiving the handover request from the UE, the UTRAN processes the request and communicates with the 5G NR network to facilitate the handover.
  • The UTRAN may initiate negotiations with the 5G NR network to establish the necessary connections and allocate resources for the handover.

Handover Execution:

  • After the necessary preparations are complete, the handover process is executed. The UE is instructed to switch its connection from UTRAN to the 5G NR network.
  • During the handover, the UE will start communicating with the target 5G NR cell, and the network resources are allocated accordingly.

NR-IRAT Handover From UTRAN Complete:

  • The "NR-IRAT Handover From UTRAN Complete" event signifies the successful completion of the handover process from UTRAN to the 5G NR network.
  • It is an acknowledgment or indication sent by the UE to UTRAN and potentially to the 5G NR network, confirming that the handover has been successfully executed.

Service Continuity:

  • The completion of the handover ensures that the UE can continue its communication services on the 5G NR network seamlessly. The UE's voice, data, or other ongoing sessions are maintained without interruption.

Failure Handling:

  • In case of any issues or failures during the handover process, appropriate failure handling procedures are followed, which may include retries or fallback mechanisms to ensure service continuity.

In summary, the "NR-IRAT Handover From UTRAN Complete" event is a signaling message or indication sent by the UE to confirm the successful handover from UTRAN (e.g., UMTS) to a 5G NR network. This event marks the completion of the inter-RAT handover process, ensuring that the UE can seamlessly continue its communication services on the 5G NR network, with the necessary radio resources and configurations in place.