Conditional Handover Control for Wireless Base Stations
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Solution Overview
Problem
Current handover control methods in wireless communications, particularly with Conditional Handover (CHO), face challenges in managing data transmission interruptions and resource allocation during cell handovers, especially in dual connectivity scenarios, where it is unclear when the source base stations should stop transmitting data to user equipment (UE), leading to potential connection failures.
Innovation Solution
A handover control method where a source base station sends a conditional handover request to a target base station, and upon receiving a confirmation, sends a conditional handover message to the UE, which triggers a conditional handover activation message. This process includes sending a secondary base station release request to ensure timely resource management and prevent connection failures by coordinating data transmission between source and target base stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source base station continues data transmission to the UE during conditional handover preparation, then data transmission continuity is maintained, but connection failure risk increases due to uncertain handover execution timing
Solution Approach 1:
The source base station sends a conditional handover request to the target base station in advance, before the actual handover execution. This preliminary action allows the target base station to prepare resources and configure parameters ahead of time, reducing the uncertainty of handover execution and maintaining connection reliability without requiring complex real-time decision-making during the handover moment.
Solution Approach 2:
The target base station sends a conditional handover request confirmation message back to the source base station, providing feedback on the handover preparation status. This feedback mechanism allows the source base station to understand the handover readiness status and make informed decisions about continuing or stopping data transmission, thereby managing connection reliability without excessive complexity.
2Reliability
If the source base station stops data transmission early during conditional handover, then connection failure risk is reduced, but data transmission interruption increases
Solution Approach 1:
The source base station sends a conditional handover request to the target base station in advance, allowing the target base station to prepare resources and configure parameters ahead of time. This preliminary preparation reduces the actual handover execution time, enabling the source base station to stop data transmission later with less interruption, thereby improving handover success rate without significant time loss.
Solution Approach 2:
The handover control mechanism dynamically adjusts the data transmission timing based on the handover execution status. The source base station continues data transmission until it receives confirmation that the handover has been executed, at which point it stops transmission. This dynamic approach optimizes the balance between connection reliability and transmission interruption time.
3Speed
If the target secondary base station allocates resources in advance for conditional handover, then handover execution speed is improved, but resource management complexity increases
Solution Approach 1:
The target secondary base station allocates resources and configures parameters in advance upon receiving the conditional handover request, before the actual handover execution. This preliminary resource allocation significantly speeds up the handover execution by eliminating resource negotiation delays at the moment of handover, while the resource management complexity is handled in a controlled preparatory phase rather than during critical handover execution.
Data Source
AI summary
A handover control method of a source base station (BS). The method includes: transmitting a conditional handover request to a target BS; when a handover request confirmation message is received from the target BS, transmitting a conditional handover message to a user equipment (UE); and receiving a conditional handover complete message from the target BS in response to a Radio Source Control (RRC) connection reconfiguration complete message being sent from the UE to the target BS.