Conditional Handover Failure Cause Determination
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Solution Overview
Problem
Current conditional handover mechanisms in wireless communication networks face challenges in accurately measuring performance and determining the cause of handover failures, leading to radio link failures and inefficient resource allocation.
Innovation Solution
A method is introduced that allows terminal devices to monitor conditions before executing a conditional handover, enabling them to detect radio link failures and report the cause of handover failures, which helps in configuring parameters to reduce misconfigurations and improve handover success rates by distinguishing between misconfigured first and second conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional handover mechanisms are implemented to enhance handover execution, then handover reliability is improved, but the ability to accurately measure performance and determine failure causes deteriorates
Solution Approach 1:
The patent segments the handover failure analysis by introducing separate timers (T310 for radio link failure detection, T304 for handover execution) and distinct condition types (first condition for radio link monitoring, second condition for handover execution). This segmentation enables precise identification of which specific condition or timer expiration caused the handover failure, thereby resolving the contradiction between maintaining reliability and achieving measurement precision.
2Reliability
If conditional handover mechanisms are implemented to enhance handover execution, then handover robustness is improved, but the complexity of detecting and measuring failure causes worsens
Solution Approach 1:
The patent implements feedback mechanisms where the terminal device monitors the serving cell based on the first condition, triggers handover execution when the second condition is met, and provides feedback through timer management (T310, T304) and failure reporting. This structured feedback system simplifies the detection of failure causes by clearly indicating whether the failure resulted from radio link deterioration or handover execution issues, resolving the contradiction between robustness and detection difficulty.
3Measurement precision
If conditional handover mechanisms are implemented, then handover performance measurement is enhanced, but resource allocation efficiency worsens due to misconfigurations
Solution Approach 1:
The patent introduces dynamic parameter adjustment based on measured performance. The network device configures the terminal with adjustable parameters including timer values (T310, T304), condition thresholds, and handover execution criteria. These parameters can be dynamically adjusted based on measured handover performance and failure causes, enabling optimization of resource allocation efficiency while maintaining accurate performance measurement capability.
Data Source
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AI summary
There is provided a method comprising: upon detecting that a first condition is met, causing a transmission of a measurement report to a wireless network; acquiring a conditional handover command from the wireless network; upon detecting that a second condition, associated with the conditional handover command, is met, starting a handover execution timer for triggering execution of a handover from a source cell to a target cell; detecting that a radio link failure condition is met before the execution of the handover is triggered; and on the basis of the detecting, signaling, to the wireless network, information indicative of a cause of a conditional handover failure to be either misconfigured first condition or misconfigured second condition.