Radio Link Failure Cause Detection via Base Station Segmentation
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Solution Overview
Problem
Current methods for detecting Radio Link Failure (RLF) or handover failure in mobile communication systems, especially in System Architecture Evolution (SAE) systems, are inefficient and unable to correctly identify the cause of failures, particularly when occurring between different Radio Access Technologies (RAT), leading to suboptimal self-optimization and performance issues.
Innovation Solution
A method where User Equipment (UE) reports RLF or handover failures to a base station, which determines the cause and sends specific reports (MRO or CCO) to the appropriate base station, optimizing self-optimization by identifying issues such as too early or late handovers, wrong cell handovers, or inter-RAT problems, thereby improving system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods for detecting RLF or handover failure are used, then the detection process is simple, but the accuracy of cause identification is low, especially for inter-RAT failures
Solution Approach 1:
The patent segments the failure detection and analysis process into distinct components: (1) UE collects failure information and sends RLF report to serving base station, (2) serving base station forwards to last serving base station, (3) last serving base station determines cause and sends MRO report to handover-triggering base station. This segmentation allows each node to perform specialized functions, improving cause identification accuracy while distributing system complexity across multiple entities rather than concentrating it in one detection mechanism.
2Reliability
If manual optimization of SAE system parameters is performed, then good coverage and capacity can be guaranteed, but large amounts of human and material resources are consumed
Solution Approach 1:
The patent implements self-service through automated failure detection and analysis. The system automatically collects failure information from UE, determines failure causes through algorithmic analysis at base stations, and generates optimization recommendations without human intervention. This self-service mechanism maintains reliable coverage and capacity by continuously monitoring and optimizing parameters, while eliminating the need for large amounts of human resources that would otherwise be required for manual parameter optimization.
Solution Approach 2:
The patent establishes a feedback loop where failure information is continuously collected from UE, analyzed by base stations to determine causes (too early handover, too late handover, wrong cell selection), and used to automatically adjust system parameters. This closed-loop feedback system enables the network to self-optimize coverage and capacity parameters based on actual failure patterns, replacing manual optimization processes and reducing resource consumption while maintaining or improving reliability.
3Measurement precision
If RLF reports are forwarded through multiple base stations to determine the cause, then accurate cause detection is achieved, but signaling complexity between base stations increases
Solution Approach 1:
The patent extracts the cause determination function from the intermediate serving base station and assigns it specifically to the last serving base station. When a handover failure occurs, the current serving base station forwards the RLF report to the last serving base station, which then performs the cause analysis and sends the MRO report to the handover-triggering base station. This extraction concentrates the analytical function at the appropriate node (last serving base station has the necessary context), improving detection accuracy while streamlining the signaling path by eliminating redundant processing steps at intermediate nodes.
Data Source
AI summary
The present invention discloses a method for detecting a cause for a Radio Link Failure (RLF) or handover failure is provided. The method includes when a User Equipment (UE) enters a connection mode after encountering RLF or handover failure, sending a RLF report that the UE encounters RLF or handover failure to a base station; determining, by the base station, a cause for RLF or handover failure according to the RLF report, if it is determined that the cause for RLF or handover failure is a problem of Mobility Robustness Optimization (MRO) or a problem of coverage, when it is a problem of MRO, sending, by the base station, a MRO report to a base station at which a cell which triggers handover for the last time is located.