DAPS Handover Re-Establishment Using Target Cell Configuration
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Solution Overview
Problem
In a radio link failure scenario during a handover procedure, terminal devices face challenges in sending a Radio Resource Control (RRC) re-establishment request message due to storing configuration information from both the source and target cells, leading to implementation complexities.
Innovation Solution
The terminal device releases configuration information from either the source or target cell based on the determined first cell, allowing it to send the RRC re-establishment request message using the appropriate configuration information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device stores both configuration information from source cell and target cell, then the device can potentially re-establish connection using either configuration, but the device complexity and memory consumption increase
Solution Approach 1:
The patent extracts and releases the source cell configuration information from the terminal device's memory when link failure is detected. This removes the conflicting configuration data, allowing the device to use only the target cell configuration for re-establishment, thereby reducing complexity while maintaining re-establishment capability
Solution Approach 2:
Instead of keeping both configurations available for re-establishment, the patent inverts the approach by selectively removing the source cell configuration. This inversion simplifies the configuration management by ensuring only one configuration (target cell) remains, eliminating the contradiction between having multiple options and maintaining simplicity
2Quantity of substance
If the terminal device releases configuration information from the source cell, then memory consumption is reduced, but the device may lose the ability to send re-establishment request using source cell configuration
Solution Approach 1:
The patent converts the potential harm of losing source cell configuration into a benefit by designing the system such that the target cell configuration becomes the sole re-establishment option. This forces a streamlined approach where the handover command's configuration is optimized for re-establishment, turning the limitation into an advantage for reducing memory consumption
3Adaptability or versatility
If the terminal device keeps both configuration informations, then it maintains more options for re-establishment, but the implementation complexity increases
Solution Approach 1:
The patent extracts the source cell configuration information from the terminal device's memory when link failure is detected. This removal eliminates the complexity of managing and selecting between multiple configurations, while the target cell configuration remains available for re-establishment, thus maintaining adaptability with reduced complexity
Solution Approach 2:
The patent changes the configuration state parameter by releasing the source cell configuration. This parameter change transforms the system from having multiple configuration options to a single configuration option, simplifying the management logic while preserving the essential re-establishment functionality through the target cell configuration
Data Source
AI summary
A re-establishment method includes: If a link failure occurs in a handover procedure of a terminal device, the terminal device releases configuration information used in a source cell. The terminal device further determines a re-establishment request message based on configuration information used in the target cell, and sends the re-establishment request message in a re-establishment cell. A method for selecting a re-establishment cell and releasing configuration information when a link failure occurs in a dual active protocol stack (DAPS) handover procedure of the terminal device reduces memory consumption of the terminal device.