Conditional Handover Failure Logging and Reporting
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Solution Overview
Problem
Existing wireless communication networks face challenges in ensuring robust mobility operations, particularly during handovers, due to issues like radio link failures and conditional handover failures, which can lead to degraded connection quality and user experience.
Innovation Solution
The proposed solution involves methods for a user equipment (UE) to report failures related to mobility operations, such as radio link failures and conditional handover failures, to a network node. The UE logs information associated with these failures and reports it to the network node after a successful mobility operation, allowing the network to optimize mobility settings and configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conditional handover operations are implemented to improve mobility robustness, then handover reliability is improved, but the complexity of mobility management increases due to multiple failure scenarios and logging requirements
Solution Approach 1:
The system performs preliminary actions by logging failure information at the time of occurrence and preparing it for subsequent reporting. The UE maintains a buffer storing failure information including source cell ID, target cell ID, and failure cause, so that when a successful handover occurs, the logged data is already ready for reporting to the network node, eliminating the need for complex real-time data collection during handover execution.
Solution Approach 2:
The system implements feedback by reporting logged failure information to the network node after successful handover completion. This feedback loop allows the network to receive detailed failure data (source cell, target cell, failure causes) and use it to optimize handover parameters and configurations, thereby improving overall handover reliability while managing complexity through automated analysis.
2Loss of information
If failure information is logged and reported after successful mobility operations, then network optimization capability is improved, but the time delay in reporting failure data increases
Solution Approach 1:
The system performs preliminary logging of failure information immediately when failures occur during conditional handover execution. The UE stores complete failure data including source cell identifier, target cell identifier, and failure causes in a buffer, preparing the information in advance so that reporting can occur efficiently once successful handover is achieved, minimizing both information loss and reporting delay.
3Reliability
If multiple failure scenarios are monitored and logged, then mobility operation reliability is improved, but the amount of data to be processed and reported increases
Solution Approach 1:
The system extracts and logs only the essential failure information elements needed for network optimization: source cell ID, target cell ID, and failure causes. By selectively extracting only these critical data points rather than logging all possible handover parameters, the system maintains comprehensive failure monitoring capability while keeping the data volume manageable for efficient processing and reporting.
Data Source
AI summary
Embodiments include methods, performed by a user equipment, UE, for reporting failures related to mobility operations by the UE to a network node in a radio access network, RAN. Such methods include logging (1210) information associated with a plurality of failures during conditional handover, CHO, operations related to a source cell and one or more first target cells. Such methods also include, after a successful mobility operation to a second target cell served by the network node, reporting (1240) the logged information, associated with the plurality of failures, to the network node. Other embodiments include complementary methods performed by a network node, as well as UEs and network nodes configured to perform such methods.