Lower-Layer Triggered Mobility for Flexible Radio Link 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 conditional reconfiguration and LTM configuration, allowing the UE to determine and switch to a selected cell based on radio link failure, with specific fields like attempt LTM switch and master key update precluded from certain RRC reconfiguration messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio link failure recovery methods are supported with different configuration information, then the adaptability and versatility of the system is improved, but the device complexity and difficulty of managing configuration information increases
Solution Approach 1:
The patent segments the recovery methods into distinct types (conditional reconfiguration and lower-layer triggered mobility) with dedicated configuration fields and indicator bits for each type. This segmentation allows the UE to clearly identify and apply the appropriate recovery method based on the received configuration, reducing confusion and management complexity despite supporting multiple methods.
Solution Approach 2:
The network pre-configures multiple recovery methods and their associated parameters before radio link failure occurs. The UE receives and stores conditional reconfiguration and LTM configurations in advance, along with indicator bits that specify which method to apply. This preliminary configuration enables rapid recovery without complex real-time decision-making when failure occurs.
2Adaptability or versatility
If the UE is provided with flexible configuration information for various recovery methods, then the adaptability is improved, but the ease of operation deteriorates as the UE must determine appropriate actions based on complex configuration fields
Solution Approach 1:
The patent applies local quality by providing specific configuration fields and indicator bits tailored to each recovery method type. The conditional reconfiguration includes its own configuration field and indicator bit, while LTM configuration includes separate fields and indicators. This localized configuration structure enables the UE to easily identify and apply the appropriate recovery method without being overwhelmed by global configuration complexity.
Solution Approach 2:
The indicator bit serves as an intermediary that mediates between the configuration information and the UE's recovery action. By setting specific indicator bit values, the network clearly indicates which recovery method the UE should apply, simplifying the UE's decision-making process while maintaining flexible configuration options.
3Manufacturing precision
If constraints are imposed on configuration information content to tailor it to specific recovery methods, then the manufacturing precision of the configuration is improved, but the device complexity increases due to multiple precluded fields
Solution Approach 1:
The patent segments the configuration structure into distinct fields for conditional reconfiguration and LTM configuration, with specific preclusions applied to each segment. For example, LTM configuration fields are precluded from conditional reconfiguration messages and vice versa. This segmented approach with targeted preclusions achieves precise configuration tailoring while maintaining clear structural organization that reduces overall complexity.
4Adaptability or versatility
If the UE must select between multiple recovery methods based on configuration information, then the adaptability is improved, but the loss of time increases due to the selection process
Solution Approach 1:
The network performs preliminary configuration by pre-setting the indicator bits to indicate the appropriate recovery method before the UE needs to make a selection. When radio link failure occurs, the UE simply checks the pre-configured indicator bit value and applies the corresponding method immediately, eliminating time-consuming real-time selection and decision-making processes.
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.