UE Radio Link Failure Reporting for Handover Type Identification
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Solution Overview
Problem
Existing wireless communication systems struggle to accurately determine the type of handover procedure preceding a radio link failure (RLF) in new mobility mechanisms like CHO or DAPS, leading to incorrect adjustments of network parameters.
Innovation Solution
User Equipment (UE) is equipped to detect RLF and store relevant information, including the type of handover procedure, global cell identity, and elapsed time, with threshold-based reporting to distinguish between CHO, DAPS, or legacy handovers, enhancing the accuracy of RLF reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE stores detailed handover procedure information in RLF reports, then the measurement precision of handover type is improved, but the device complexity increases
Solution Approach 1:
The patent extracts only the essential handover procedure type information from the complex handover process and stores it separately in the RLF report. This allows the UE to maintain detailed tracking of handover procedures internally while only reporting the critical classification (CHO, DAPS, or legacy handover) in the RLF report, thus improving measurement precision without proportionally increasing reporting complexity
Solution Approach 2:
The patent segments the handover information into distinct components: internal tracking of handover procedures, classification into types (CHO, DAPS, legacy), and selective reporting in RLF reports. This segmentation allows the UE to process and store detailed handover information internally while presenting a simplified, type-classified summary in the RLF report to the network
2Manufacturing precision
If the UE includes handover procedure type information in RLF reports, then the network optimization accuracy is improved, but the loss of information increases
Solution Approach 1:
The patent applies local quality by including handover procedure type information selectively in RLF reports only when relevant to the failure analysis. The UE determines whether to include this additional information based on the specific RLF scenario, ensuring that network optimization benefits are achieved without unnecessarily increasing report size or complexity in all cases
3Measurement precision
If the UE monitors and reports elapsed time from handover command reception, then the measurement precision of handover timing is improved, but the use of energy increases
Solution Approach 1:
The patent implements preliminary action by having the UE continuously monitor and track the elapsed time from handover command reception in the background, without requiring additional active processing or energy-intensive operations. The timing information is accumulated incrementally as part of the normal handover procedure execution, and only needs to be reported when an RLF occurs, thus minimizing energy consumption while maintaining precise timing measurements
Data Source
AI summary
The present disclosure provides a radio link failure reporting method and user equipment. The radio link failure reporting method includes: detecting, by user equipment (UE), occurrence of a radio link failure (RLF); and storing, by the UE, radio link failure information in an RLF report, wherein if the UE has performed a handover procedure before the RLF, the radio link failure information includes: information for indicating the type of the handover procedure; a global cell identity and a tracking area code of a cell where the latest handover command was received; and an elapsed time starting from reception of the latest handover command.