Terminal Device SCG Configuration Storage for SN Change
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Solution Overview
Problem
In dual connectivity scenarios, terminal devices waste communication transmission resources due to overlapping candidate secondary cell groups (SCGs) when performing SN changes, as they reobtain and reconfigure SCGs each time.
Innovation Solution
The method involves receiving configuration information of multiple candidate SCGs from the network side, storing this information, and performing PSCell changes based on predetermined change conditions. The configuration information remains stored after the change, allowing for subsequent evaluations without reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device reobtains and reconfigures candidate SCGs each time SN change is performed, then the terminal device can have updated SCG configurations, but communication transmission resources are wasted due to overlapping candidate SCGs
Solution Approach 1:
The terminal device performs preliminary actions by storing the configuration information of multiple candidate SCGs in advance. When SN change is triggered, the terminal device can directly use the stored configuration information without needing to reobtain and reconfigure the candidate SCGs, thereby avoiding the waste of communication transmission resources while ensuring configuration availability.
2Loss of information
If the terminal device stores configuration information of multiple candidate SCGs for reuse, then signaling overhead is reduced, but the device complexity increases due to additional storage and management requirements
Solution Approach 1:
The terminal device extracts and stores only the essential configuration information of multiple candidate SCGs, separating the storage of configuration data from the execution of SN change procedures. This extraction approach reduces signaling overhead while managing device complexity by storing pre-configured data locally without requiring complex real-time configuration management during SN change.
3Productivity
If the terminal device releases other SCGs after performing PSCell change to target SCG, then resource allocation is optimized, but the device cannot quickly switch back or to alternative SCGs if needed
Solution Approach 1:
The terminal device changes the parameter of configuration information retention by maintaining stored configuration data of multiple candidate SCGs even after PSCell change. This parameter change allows the device to keep alternative SCG configurations available, providing flexibility for quick switching back or to other SCGs while maintaining resource allocation efficiency through selective usage of stored configurations.
Data Source
AI summary
Methods for SCG configuration and a terminal device are provided. Configuration information of multiple candidate SCGs is received from a network side. The configuration information of the multiple candidate SCGs is stored. If the terminal device determines that the first target SCG fulfills a change condition, PSCell change is performed from a source SCG to a first target SCG, where the first target SCG is one of the multiple candidate SCGs. Alternatively, PSCell change is performed from the source SCG to a second target SCG, where the second target SCG is designated by the network side, and the second target SCG is one of the multiple candidate SCGs or is not included in the multiple candidate SCGs. After the terminal device performs PSCell change from the source SCG to the first/second target SCG, the configuration information of the multiple candidate SCGs remains stored in the terminal device.