Cross-RAT RLF Logging and Reporting with PLMN Identification
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Solution Overview
Problem
Existing systems lack efficient methods for a terminal to log and report radio link failure (RLF) information across different radio access technologies (RATs), particularly when transitioning between core networks.
Innovation Solution
A method and apparatus that enable a terminal to receive and transmit RLF reports, including logging information for cells of a second RAT, by identifying the public land mobile network (PLMN) identity based on a PLMN identity list received from a second base station, facilitating reporting to a first base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the terminal logs and reports RLF information for cells of a second RAT, then the network optimization accuracy is improved, but the device complexity increases due to multi-RAT information management
Solution Approach 1:
The patent segments the RLF reporting process by separating first RAT information (received from first base station) from second RAT information (received from second base station via system information). The terminal selectively logs and reports only relevant RLF information based on the requesting base station's RAT type, dividing the complex multi-RAT reporting task into manageable segments.
Solution Approach 2:
The patent uses the first base station as an intermediary that receives system information containing second RAT RLF information from the second base station, then forwards it to the terminal. This intermediary mechanism allows the terminal to obtain and report second RAT information without directly managing complex inter-RAT communication protocols.
2Loss of information
If the terminal selectively reports RLF information based on core network type, then the information relevance is improved, but the processing time increases due to additional identification steps
Solution Approach 1:
The patent implements preliminary action by having the terminal pre-identify its connected core network type (EPC or 5GC) and pre-categorize received RLF information accordingly. When a base station requests RLF reporting, the terminal can immediately filter and report only the relevant information without performing real-time analysis, thus reducing processing time while maintaining high information relevance.
3Adaptability or versatility
If the system implements cross-RAT RLF reporting, then the network optimization capability is improved, but the device complexity increases due to multi-RAT coordination
Solution Approach 1:
The patent implements universality by designing the terminal with a unified RLF logging and reporting mechanism that can handle both first RAT and second RAT information through the same interface. The terminal receives RLF information from different RATs using the same procedures and reports to different base stations using consistent protocols, enabling cross-RAT optimization without requiring separate specialized mechanisms for each RAT.
Data Source
AI summary
The disclosure relates to a communication technique for combining an IoT technology with a 5G communication system for supporting a higher data transmission rate than a 4G system, and a system therefor. The disclosure can be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail businesses, security and safety-related services, etc.) based on 5G communication technologies and IoT-related technologies. The disclosure provides a method and an apparatus for logging and reporting information relating to a radio link failure. The method includes receiving, from a first base station that operates based on a first RAT, a UE information request including information indicating whether the terminal reports an RLF; and transmitting, to the first base station, a UE information response including an RLF report, in response to the information indicating a reporting of the terminal for the RLF.