Lower-Layer Triggered Mobility for Radio Link Failure Recovery
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Solution Overview
Problem
Existing radio link failure recovery methods in wireless communication systems lack flexibility in configuration information and often require complex handling of configuration details, leading to inefficiencies and potential delays in UE actions.
Innovation Solution
The proposed solution involves an apparatus and method for receiving a first RRC reconfiguration message with a conditional reconfiguration field and a lower-layer triggered mobility (LTM) configuration field. This allows for a conditional reconfiguration and LTM cell switch based on specific configuration fields, enabling flexible recovery from radio link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio link failure recovery methods are supported with different configuration information, then flexibility and adaptability are improved, but device complexity and configuration management become more complex
Solution Approach 1:
The patent segments the recovery configuration into distinct types (conditional reconfiguration and lower-layer triggered mobility) with separate configuration fields and independent handling procedures. Each recovery method has its own configuration structure, allowing the UE to process them independently based on the detected failure scenario, thereby reducing the complexity of managing multiple recovery methods simultaneously.
Solution Approach 2:
The patent applies different configuration information structures to different recovery methods. Conditional reconfiguration uses one configuration format while lower-layer triggered mobility uses another. The network can selectively provide appropriate configuration based on the specific recovery scenario, ensuring that each method receives only the necessary configuration details rather than all possible configurations.
2Manufacturing precision
If the UE must select between applying conditional reconfiguration or performing LTM cell switch, then configuration precision is improved, but recovery time and processing delays increase
Solution Approach 1:
The patent prepares both conditional reconfiguration and LTM cell switch configurations in advance, with pre-configured parameters and procedures. When radio link failure occurs, the UE can immediately evaluate the pre-prepared configurations and execute the appropriate one without requiring additional processing or configuration retrieval, thereby reducing recovery delay while maintaining configuration precision.
3Stability of the object's composition
If the LTM configuration field is precluded from the second RRC reconfiguration message, then information consistency is improved, but configuration flexibility is reduced
Solution Approach 1:
The patent extracts the LTM configuration field from the second RRC reconfiguration message to prevent configuration conflicts and ensure consistency. By separating the LTM configuration into a distinct structure that is not included in the conditional reconfiguration message, the system maintains clear boundaries between different configuration types, ensuring that each configuration field contains only the appropriate information for its specific purpose.
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.