UE Radio Link Failure Reports for Conditional LTM Cell Switches
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Solution Overview
Problem
Existing wireless communication systems lack effective reporting mechanisms for radio link failures (RLF) during lower layer triggered mobility (LTM), which can lead to inefficiencies and disruptions in 5G and beyond networks.
Innovation Solution
Implementing enhanced RLF reporting procedures in user equipment (UE) to detect and report failures during conditional LTM cell switches, including new fields in RLF reports such as timeSinceLTM-Reconfig, condltmCandidateCellList, and CondltmCellId to provide detailed failure information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conditional LTM cell switch is implemented for faster mobility, then mobility speed and responsiveness are improved, but reliability of cell switch execution deteriorates due to lack of failure reporting mechanism
Solution Approach 1:
The patent implements a feedback mechanism where the UE detects cell switch execution status and reports failure information back to the network. The RLF report includes specific fields (timeSinceLTM-Reconfig, condltmCandidateCellList, CondltmCellId) that provide feedback on whether the conditional LTM cell switch was successfully executed, enabling the network to identify and manage failures.
2Measurement precision
If detailed failure information is collected in RLF reports, then measurement precision and failure identification are improved, but device complexity increases due to additional reporting fields and processing
Solution Approach 1:
The patent segments the failure reporting mechanism into specific structured fields within the RLF report. Instead of a single complex report, the failure information is divided into distinct components: timeSinceLTM-Reconfig (timing information), condltmCandidateCellList (candidate cell identifiers), and CondltmCellId (executed cell identifier). This segmentation makes the complex information more manageable and processable.
Data Source
AI summary
A user equipment includes a transceiver, and a processor operatively coupled to the transceiver. The transceiver is configured to receive, from a source cell, a conditional lower layer triggered mobility (LTM) configuration for at least one conditional LTM candidate cells. The processor is configured to initiate execution of a conditional LTM cell switch towards a target cell of the at least one conditional LTM candidate cells, determine that the conditional LTM cell switch towards the target cell has failed, and in response to the determination that the conditional LTM cell switch towards the target cell has failed, generate a radio link failure (RLF) report.