RLF Reporting in Shared Logical Cells for Handover Optimization
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Solution Overview
Problem
In radio access network (RAN) sharing scenarios where multiple logical cells belonging to different networks share a physical cell, existing methods fail to effectively utilize radio link failure (RLF) reports to optimize mobility-related parameters, leading to increased connection failure rates and reduced handover success rates.
Innovation Solution
A communication method and apparatus that enables a terminal device to record and report detailed cell information and PLMN identifiers for logical cells involved in connection failures, allowing access network devices to optimize mobility-related parameters based on this information, thereby reducing connection failures and improving handover success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal device records and reports RLF reports in RAN sharing scenarios with multiple logical cells, then the ability to optimize mobility-related parameters is improved, but the complexity of report recording and reporting is increased
Solution Approach 1:
The patent segments the report content into distinct fields: failed cell information, source cell information, and target cell information. Each field contains specific sub-elements (PCI, CGI, failure type, etc.). This segmentation allows the terminal to systematically record different aspects of connection failure separately, making the complex reporting process more manageable and enabling network devices to process specific failure aspects independently for mobility optimization.
2Measurement precision
If detailed cell information and PLMN identifiers are included in RLF reports, then the precision of mobility parameter optimization is improved, but the amount of information to be reported is increased
Solution Approach 1:
The patent extracts only the most critical information elements needed for mobility optimization from the complete cell data. Specifically, it extracts PCI and CGI for cell identification, failure type for error classification, and PLMN identifier for network identification. By taking out only these essential elements rather than reporting all possible cell parameters, the patent achieves precise mobility optimization while controlling report size.
3Reliability
If RLF reports are used to optimize mobility-related parameters in shared cells, then connection failure rate is reduced, but the difficulty of identifying the correct access network device is increased
Solution Approach 1:
The patent introduces PLMN identifier as an intermediary element in the report. Since shared cells are associated with multiple PLMNs and the terminal knows which PLMN it is accessing, the PLMN identifier acts as a mediator that helps the receiving device identify which specific access network device (and thus which logical cell) should process the RLF report. This intermediary information bridges the gap between the physical shared cell and the logical cell management, enabling accurate report routing without increasing overall system complexity.
Data Source
AI summary
Embodiments of this application provide a communication method, an apparatus, and a system. In one example method, after determining that a connection failure occurs, a terminal device records and sends a first report. The first report includes cell information of a first logical cell, or the first report includes a PLMN identifier of a first logical cell and cell information of a second logical cell. The first logical cell includes at least one of a source logical cell or a failed logical cell in which the connection failure occurs. The second logical cell includes at least one of a first logical cell that shares a same physical cell with the source logical cell or a first logical cell that shares a same physical cell with the failed logical cell.