Conditional Handover Execution Message Signaling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing handover procedures between cells, leading to delays and inefficiencies due to outdated conditional handover configurations and lack of proactive data forwarding during handovers.
Innovation Solution
Implementing a conditional handover procedure where user equipment (UE) transmits a handover execution message to the source cell, allowing proactive data forwarding to the target cell and periodic updates of handover configurations to ensure timely and efficient cell transfers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional handover procedures are used, then handover execution is simple, but handover delays occur and network efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by having the UE transmit the handover execution message to the source cell before actually switching to the target cell. This advance notification allows the source cell to proactively forward data to the target cell and update configurations in advance, eliminating the traditional sequential delays where data forwarding and configuration updates wait for handover completion.
Solution Approach 2:
The handover execution message serves as an intermediary signal between the UE and the source cell. This message triggers the source cell to initiate data forwarding and configuration updates to the target cell, creating a coordinated handover process that reduces delays while maintaining network control.
2Reliability
If conditional handover configurations are not updated, then signaling overhead is reduced, but configurations become outdated and handover reliability deteriorates
Solution Approach 1:
The patent implements feedback by having the UE report handover execution to the source cell via the handover execution message. This feedback loop allows the source cell to understand the UE's handover status and respond by forwarding updated configurations and data to the target cell, ensuring configurations remain current without excessive signaling.
Solution Approach 2:
The source cell performs preliminary action by proactively forwarding updated configurations and data to the target cell upon receiving the handover execution message, before the UE completes the handover. This ensures the target cell has current configurations ready, improving handover reliability without waiting for post-handover updates.
3Productivity
If data forwarding is performed proactively, then handover continuity is improved, but network signaling complexity increases
Solution Approach 1:
The patent extracts the data forwarding action from the traditional post-handover process and performs it proactively upon receiving the handover execution message. By separating this function and executing it in advance, the system improves data transfer efficiency while the standardized message format keeps signaling complexity manageable.
Solution Approach 2:
The source cell performs preliminary data forwarding to the target cell before the UE completes handover, triggered by the handover execution message. This proactive approach ensures data continuity while using an efficient message-based trigger mechanism that avoids excessive signaling complexity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine to perform a conditional handover procedure to transfer from a source cell to a target cell of a plurality of candidate target cells. The UE may transmit, to the source cell, a conditional handover execution message to indicate the conditional handover procedure to transfer from the source cell to the target cell based at least at least in part on determining to perform the conditional handover procedure. The UE may communicate with the target cell to transfer to the target cell based at least in part on determining to perform the conditional handover procedure. Numerous other aspects are provided.