Cell Handover RLF Reporting for CHO and DAPS Failures
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Solution Overview
Problem
Existing cell handover technologies face challenges with handover failures and radio link failures (RLF), necessitating enhancements in air interface and XN interface messages, especially with enhanced handover characteristics like conditional handover and dual active protocol stack handover.
Innovation Solution
A method and apparatus that enhance RLF reporting by recording timing duration and generating RLF reports during cell handovers with enhanced characteristics, and network devices generate failure indication messages for parameter optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enhanced handover characteristics (CHO or DAPS handover) are introduced, then handover reliability is improved, but message complexity increases
Solution Approach 1:
The patent segments the handover process into distinct phases (initial handover from first cell to second cell, and subsequent handover from second cell to third cell), with specific message types for each phase. This segmentation allows complex enhanced handover procedures to be managed through structured, phased message exchanges, reducing overall system complexity while maintaining reliability.
Solution Approach 2:
The patent implements preliminary actions by having the terminal record timing duration information during the first handover phase before the actual RLF occurs. This pre-recording of timing data enables faster failure analysis and reduces the complexity of post-failure reporting, as the critical timing information is already captured when the failure happens.
2Measurement precision
If RLF reporting is enhanced with timing duration, then measurement precision is improved, but information processing complexity increases
Solution Approach 1:
The timing duration recording mechanism serves multiple functions: it measures the time from first message reception to RLF occurrence, tracks handover performance metrics, and provides diagnostic information for network optimization. This multi-functionality reduces the need for separate measurement systems, thereby managing information processing complexity while achieving precise timing measurements.
Solution Approach 2:
The terminal autonomously records and manages timing duration information without requiring continuous network intervention. The terminal self-manages the timing records, generates RLF reports with embedded timing data, and transmits this information when needed, reducing the overall system's information processing complexity while maintaining high measurement precision.
3Measurement precision
If multiple handover messages are transmitted, then handover control accuracy is improved, but communication overhead increases
Solution Approach 1:
The patent merges multiple pieces of critical information into consolidated message structures. The RLF report combines timing duration data, failure cause information, and handover context into a single comprehensive message, reducing the total number of separate messages required while maintaining high control accuracy through the integrated information.
Solution Approach 2:
The patent implements partial action by selectively transmitting enhanced RLF reporting information only when actual RLF occurrences are detected during enhanced handover procedures. This approach avoids the overhead of continuously transmitting detailed timing and diagnostic data, optimizing the balance between control accuracy and message quantity by providing enhanced information only when necessary for failure analysis.
Data Source
AI summary
The present application provides a cell handover method which includes: receiving a first message transmitted by a first cell, where the first message indicates the terminal to perform a cell handover with an enhanced handover characteristic or a cell handover with a non-enhanced handover characteristic, and the cell handover with the enhanced handover characteristic includes a conditional handover (CHO) or a dual active protocol stack (DAPS) handover; performing a handover from the first cell to a second cell according to the first message; receiving a second message transmitted by the second cell, where the second message indicates the terminal to perform the cell handover with the enhanced handover characteristic; and performing a handover from the second cell to a third cell according to the second message, and generating an RLF report and recording timing duration in the RLF report if an RLF occurs in the second cell.