Secondary Node Change Feedback for Dual Connectivity Timing
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Solution Overview
Problem
In Dual Connectivity scenarios, the network device cannot accurately determine the exact time at which measurement results meet the secondary node change condition, leading to inefficiencies in the secondary node change process and unnecessary consumption of air interface resources.
Innovation Solution
Implementing a method where the terminal device provides timely indication of meeting the secondary node change condition, allowing the network device to instruct the source secondary node to release the connection and terminate data transmission, thereby optimizing the secondary node change process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the network device uses measurement ID to configure secondary node change conditions, then the terminal device can execute the change process, but the network device cannot know the exact time when measurement results meet the change condition
Solution Approach 1:
The terminal device sends first indication information to the network device when measurement results meet the secondary node change condition. This feedback mechanism allows the network device to timely know that the change condition is satisfied, resolving the information loss about the exact timing of condition met while maintaining the measurement ID-based configuration approach
Solution Approach 2:
The terminal device autonomously determines when measurement results meet the secondary node change condition and actively notifies the network device. This self-service approach enables the terminal to self-manage the condition monitoring and timing information, eliminating the network device's inability to know the exact time without adding complex network-side monitoring
2Reliability
If the source secondary node continues data transmission until notified, then data completeness is maintained, but air interface resources are unnecessarily consumed
Solution Approach 1:
The terminal device's first indication information provides timely feedback to the network device, which then notifies the source secondary node to stop data transmission. This feedback-driven approach ensures data completeness is maintained only until the change condition is met, after which transmission stops immediately, eliminating unnecessary air interface resource consumption
Solution Approach 2:
The network device pre-configures the terminal device with secondary node change conditions including measurement IDs and execution events. This preliminary configuration enables the terminal to autonomously determine when to trigger the change, allowing the source secondary node to stop transmission at the precise moment the condition is met, balancing data completeness with resource efficiency
Data Source
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AI summary
Embodiments of the present disclosure provide a secondary node change method, a terminal device, and a network device. The network device can timely know that measurement results of the terminal device meet the secondary node change condition, thereby improving the performance of secondary node change. The secondary node change method includes: receiving, by a master node, first indication information indicating that a secondary node change condition has been met or that a secondary node change process has been initiated by a terminal device; and transmitting, by the master node in response to the first indication information, second indication information to a source secondary node, the second indication information instructing the source secondary node to release a connection towards the terminal device, and/or instructing the source secondary node to terminate data transmission towards the terminal device.