RLF Report Mechanism for Mobile Network Failure Diagnosis
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Solution Overview
Problem
Current self-optimization methods for mobile communication systems, particularly in SAE systems, face challenges in accurately determining the cause of Radio Link Failure (RLF) or handover failure, leading to incorrect optimization and performance issues.
Innovation Solution
A method where a User Equipment (UE) transmits an RLF information report to an evolved Node B (eNB) containing details such as recent handover status, serving and neighboring cell measurements, cell identities, and time of failure, enabling the eNB to correctly determine the cause of RLF or handover failure and perform appropriate self-optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE transmits detailed RLF information report containing handover status, cell measurements, and failure timing data, then the measurement precision for determining failure cause is improved, but the use of energy by the terminal increases
Solution Approach 1:
The patent extracts only the essential information needed for RLF cause determination from the complete set of available UE measurements and status data. The RLF information report includes specifically selected elements such as handover status, cell measurement results, and failure timing, omitting redundant data to reduce transmission energy consumption while maintaining sufficient accuracy for cause analysis.
Solution Approach 2:
The patent implements partial action by transmitting a subset of available measurement data rather than all possible parameters. The RLF information report contains only the critical measurements and status indicators necessary for determining the failure cause, avoiding the energy overhead of transmitting complete measurement sets while ensuring adequate diagnostic information is provided.
2Reliability
If the eNB performs comprehensive self-optimization based on detailed RLF information, then the reliability of the mobile communication system is improved, but the device complexity of the eNB increases
Solution Approach 1:
The patent segments the self-optimization process into distinct functional modules within the eNB, each handling specific aspects of RLF analysis. The optimization system is divided into separate components for handover parameter optimization, cell configuration optimization, and coverage optimization, allowing complex optimization tasks to be managed through modular processing while improving overall system reliability.
Solution Approach 2:
The patent implements preliminary action by pre-configuring optimization algorithms and decision-making rules in the eNB before actual RLF events occur. The eNB maintains pre-established optimization strategies and parameter adjustment rules that are automatically applied when RLF information is received, reducing the real-time processing complexity while ensuring reliable and consistent optimization outcomes.
3Measurement precision
If the system collects and processes extensive RLF data including multiple measurement results and timing information, then the measurement precision for optimization decisions is improved, but the loss of time for data collection and processing increases
Solution Approach 1:
The patent applies preliminary action by having the UE continuously measure and buffer critical parameters such as cell signal quality, handover status, and timing information before RLF occurs. This pre-collection of measurement data ensures that when RLF happens, the necessary information is already available for immediate reporting and processing, eliminating the need for time-consuming data gathering after the failure event.
Solution Approach 2:
The patent extracts only the most critical measurement parameters and timing data that are essential for determining RLF cause and guiding optimization decisions. The RLF information report includes selectively extracted data elements such as key cell measurements, handover timing, and failure characteristics, omitting less relevant information to reduce processing time while maintaining sufficient precision for effective optimization.
Data Source
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AI summary
A terminal, a Base Station (BS) and a method for detecting a cause of a Radio Link Failure (RLF) or handover failure are provided. The method includes that a radio link failure, RLF, or a handover failure occurs on a first cell, performing a connection re-establishment or a connection establishment on a second cell in response to the RLF or the handover failure, and transmitting an RLF report to a BS for the second cell, after a connection on the second cell, wherein the RLF report includes: information on a time elapsed since a reception of a handover command to the first cell until the RLF or the handover failure, and information on a time between a radio resource control, RRC, connection and the RLF or the handover failure.