Radio Link Failure Reporting in 5G IoT Terminals
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Solution Overview
Problem
Current next-generation mobile communication systems face challenges in efficiently performing radio link failure reporting and supporting multiple DRX configuration information, which affects the reliability of handover operations and power consumption optimization.
Innovation Solution
The method involves enhanced radio link failure reporting and DRX configuration management, where user equipment (UE) collects and reports detailed information during conditional handover failures and dynamically adjusts DRX configurations based on multiple serving cells to minimize power consumption and optimize handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed information is collected and reported during conditional handover failures, then the accuracy of radio link failure reporting is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The failure reporting information is segmented into multiple fields including failure type indication, handover execution status, conditional handover execution status, and target cell identification. This segmentation allows the system to collect detailed information in an organized manner while managing complexity through structured data collection at different protocol layers (physical layer, MAC layer, RLC layer, PDCP layer, RRC layer).
Solution Approach 2:
The UE prepares and collects failure reporting information in advance during the handover execution process, before actual failure occurs. The system pre-configures measurement parameters, thresholds, and reporting structures, allowing detailed information to be gathered and organized proactively rather than reactively, reducing processing overhead during actual failure events.
2Use of energy by moving object
If multiple DRX configuration information are supported for multiple serving cells, then power consumption optimization is improved, but the device complexity and configuration management overhead increase
Solution Approach 1:
The system segments DRX configuration by associating each serving cell with its own DRX configuration parameters. This allows independent optimization of power consumption for each cell while maintaining manageable complexity through structured configuration management at the RRC layer, separating configuration, activation, and execution phases.
Solution Approach 2:
The DRX configuration is made dynamic and adjustable based on serving cell conditions and UE power state. The system can dynamically activate or deactivate specific DRX configurations for different cells, allowing flexible power optimization while managing complexity through conditional activation rather than permanent configuration of all parameters.
3Reliability
If handover execution is performed based on detailed measurement information, then the reliability of handover operations is improved, but the measurement and processing requirements increase
Solution Approach 1:
The system performs preliminary measurement configuration and threshold setting before handover execution. Measurement parameters, evaluation criteria, and reporting thresholds are pre-configured, allowing the UE to systematically collect and evaluate measurement information without ad-hoc processing during critical handover moments, thereby improving reliability while managing measurement complexity.
Solution Approach 2:
The system implements feedback mechanisms where measurement results are continuously reported and evaluated against pre-configured thresholds. This feedback loop allows the system to make informed handover decisions based on accumulated measurement data, improving reliability through systematic evaluation while managing processing requirements through structured feedback rather than continuous complex analysis.
Data Source
Figure 1A~1B
Figure 1C
Figure 1D
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A method performed by a terminal comprises detecting a radio link failure (RLF) and starting a first timer; entering an IDLE state in case that the terminal does not find a suitable cell connectable with the terminal before the first timer expires; and transmitting, to a cell in which the terminal is able to transit from the IDLE state to a connected-mode state, an RLF report message including information associated with the suitable cell.