Lower-Layer Triggered Mobility Configuration for Radio Link Failure Recovery
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Solution Overview
Problem
Existing radio link failure recovery methods lack flexibility in configuration and often require inappropriate actions by the UE, necessitating a solution that allows for tailored and appropriate recovery methods based on configuration information.
Innovation Solution
The implementation of a lower-layer triggered mobility (LTM) mechanism that includes a conditional reconfiguration and an LTM configuration, allowing the UE to perform an LTM cell switch based on specific conditions, such as radio link failure detection, and determining a selected cell for recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio link failure recovery methods are provided with different configuration information, then the system provides more recovery options and flexibility, but the complexity of configuration management and UE decision-making increases
Solution Approach 1:
The patent defines a universal set of configuration information that can be used across multiple radio link failure recovery methods. Instead of requiring separate configuration sets for each recovery method, the system uses a common configuration framework that can accommodate different recovery approaches (LTM cell switch, conditional reconfiguration, etc.), thereby reducing configuration management complexity while maintaining versatility.
Solution Approach 2:
The patent employs parameter change mechanisms where the same configuration information structure can adapt to different recovery methods by changing specific parameters or flags within the configuration. This allows the UE to interpret the same configuration framework differently based on the selected recovery method, reducing the need for multiple distinct configuration types.
2Adaptability or versatility
If the UE is provided with multiple recovery methods and configuration information, then the UE can select the most appropriate recovery method, but the UE processing complexity and decision-making burden increases
Solution Approach 1:
The patent implements self-service mechanisms where the UE autonomously selects and executes the appropriate recovery method based on the configuration information and current radio link state. The UE uses predefined selection criteria and configuration parameters to automatically determine the best recovery method without requiring complex decision-making support or manual intervention, thereby simplifying operation while maintaining versatility.
Solution Approach 2:
The patent provides preliminary configuration information that pre-establishes the parameters and criteria needed for recovery method selection before the radio link failure occurs. This preliminary setup includes pre-configured recovery options and selection guidelines, allowing the UE to quickly and easily make recovery decisions when failure occurs without needing to process complex real-time configuration data.
3Reliability
If configuration information is tailored to specific radio link recovery methods, then the recovery process becomes more efficient and appropriate, but the complexity of configuring and managing different configuration sets increases
Solution Approach 1:
The patent uses a universal configuration information structure that can be tailored to different recovery methods through a common framework. Instead of maintaining separate configuration sets for each recovery method, the system uses a single configurable structure that can adapt its parameters to match the specific recovery method being applied, thereby achieving method-specific tailoring without the complexity of multiple configuration sets.
Solution Approach 2:
The patent segments the configuration information into modular components that can be selectively applied to different recovery methods. This segmentation allows the system to maintain a unified configuration structure while enabling method-specific customization through optional or conditional configuration elements, reducing the overall complexity of configuration management.
Data Source
AI summary
A method comprising receiving a first Radio Resource Control (RRC) reconfiguration message, the first RRC reconfiguration message including: a conditional reconfiguration field that comprises a conditional reconfiguration, and a lower-layer triggered mobility (LTM) configuration field that comprises an LTM configuration, the conditional reconfiguration comprising an RRC reconfiguration field that includes a second RRC reconfiguration message, wherein the second RRC reconfiguration message comprises a master key update field and wherein the LTM configuration field is precluded from the second RRC reconfiguration message, the LTM configuration comprising an attempt LTM switch field and an RRC reconfiguration field that includes a third RRC reconfiguration message, wherein the conditional reconfiguration field, the LTM configuration field, and the master key update field are precluded from the third RRC reconfiguration message, detecting a radio link failure of a master cell group (MCG), determining a selected cell based on the radio link failure of the MCG, and performing an LTM cell switch to the selected cell based on the LTM configuration is disclosed.