UE DAPS Handover Failure Reporting With Source RLF Fallback
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Solution Overview
Problem
Existing wireless communication systems fail to effectively record and report radio link failure information during Dual Active Protocol Stack (DAPS) handovers, particularly when multiple failures occur consecutively, hindering network optimization and parameter tuning.
Innovation Solution
The user equipment (UE) is equipped with methods to record and report radio link failure information, including source base station RLF, during DAPS handovers, by generating and storing relevant data in specific scenarios, even when multiple failures occur, ensuring comprehensive failure reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE generates and stores handover failure information for DAPS handover failure in the link failure report, then the failure information is recorded for network optimization, but the link failure report becomes more complex and larger in size
Solution Approach 1:
The patent segments the link failure report into distinct components: source base station RLF information and DAPS handover failure information. Each failure type is recorded separately with its own specific parameters, allowing the system to maintain comprehensive failure information while organizing it in a structured, manageable format that reduces overall complexity.
Solution Approach 2:
The patent adds a new dimension to the link failure report by incorporating DAPS handover failure information alongside traditional RLF information. This creates a multi-dimensional failure reporting structure that captures both types of failures without interfering with each other, enabling comprehensive optimization while maintaining clear organization.
2Loss of information
If the UE records both source base station RLF and DAPS handover failure information, then network optimization benefits from detailed data, but the processing and storage requirements increase
Solution Approach 1:
The patent extracts only the essential failure information parameters needed for network optimization. For source base station RLF, it records timing information and failure cause; for DAPS handover failure, it records handover-specific parameters. This selective extraction ensures complete failure information is captured without storing unnecessary data, balancing completeness with storage efficiency.
3Productivity
If the UE falls back to source base station link without generating handover failure information, then the connection is restored quickly, but the network loses valuable failure information for optimization
Solution Approach 1:
The patent applies preliminary action by recording the DAPS handover failure information in the link failure report before the UE falls back to the source base station link. This ensures that failure information is preserved for network optimization while the UE can still restore connection quickly through the fallback mechanism, eliminating the trade-off between speed and information retention.
Data Source
AI summary
Provided in the present invention is a method performed by user equipment (UE), including: when the UE undergoes a dual active protocol stack (DAPS) handover failure during a DAPS handover, if no source base station radio link failure (RLF) is detected, the UE falling back to a source base station link, without generating and storing handover failure information for the DAPS handover failure in a link failure report; and if the UE, when falling back to the source base station link, detects a source base station RLF, the UE recording and storing link failure information for the source base station RLF in the link failure report.