Terminal Failure Recovery Indication for MR-DC Cell Group Activation
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Solution Overview
Problem
In Multi-Radio Dual Connectivity (MR-DC) systems, terminal devices face challenges with selective activation of cell groups during failure recovery, leading to increased signaling overhead and delay due to repeated attempts and lack of support for simultaneous configuration of conditional handover and conditional PSCell change.
Innovation Solution
Implementing an indication method for failure recovery that allows terminal devices to determine and perform failure recovery based on configuration information for mobility, including selective activation of cell groups, while limiting repeated attempts and maintaining configuration information for cell group activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device attempts cell group activation multiple times for failure recovery, then the reliability of failure recovery is improved, but the signaling overhead and interruption duration increase
Solution Approach 1:
The network device pre-configures the terminal device with indication information about whether failure recovery is allowed before mobility operations occur. This preliminary configuration enables the terminal to make immediate decisions during failure events without requiring multiple recovery attempts or additional signaling exchanges, thereby improving recovery reliability while minimizing interruption duration.
2Adaptability or versatility
If the terminal device does not delete configurations for selective activation of cell groups, then the adaptability for mobility schemes is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the decision-making logic for configuration retention from the terminal device and places it in the network device. The network device sends explicit indication information telling the terminal whether to retain or delete mobility configurations after failure recovery. This extraction simplifies terminal device complexity while maintaining high adaptability for different mobility schemes, as the terminal simply follows network instructions rather than independently managing complex configuration state decisions.
Data Source
AI summary
An indication method for failure recovery is applied to a terminal device, and includes: determining to perform failure recovery based on configuration information for mobility.