Secondary Node Change Timing Feedback for Resource Release
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Solution Overview
Problem
In Dual Connectivity scenarios, the network device cannot accurately determine when secondary node change conditions are met, leading to inefficient use of air interface resources and delayed data transmission.
Innovation Solution
Implementing methods for the master node, source secondary node, and terminal device to exchange indication information when secondary node change conditions are met, allowing timely release of connections and data transmission, reducing unnecessary resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the network device uses measurement identity to indicate secondary node change conditions to the terminal device, then the terminal device can execute secondary node change based on measurement results, but the network device cannot know the exact time when measurement results meet the change condition
Solution Approach 1:
The terminal device feeds back indication information to the network device when measurement results meet the secondary node change condition. This feedback mechanism allows the network device to know the exact timing when the condition is fulfilled, resolving the information loss about timing while maintaining the measurement-based execution approach.
Solution Approach 2:
The network device pre-configures the terminal device with secondary node change execution conditions including measurement identities and execution events. This preliminary configuration enables the terminal device to autonomously determine when conditions are met and trigger the change process, reducing the time delay while the feedback mechanism provides timing information.
2Productivity
If the terminal device autonomously executes secondary node change based on measurement conditions, then the execution can be triggered timely, but the network device cannot timely release resources from the source secondary node
Solution Approach 1:
The terminal device sends indication information to the network device when it autonomously executes the secondary node change. This feedback enables the network device to timely release resources from the source secondary node, preventing air interface resource waste while maintaining fast execution speed through autonomous triggering.
Solution Approach 2:
The terminal device autonomously monitors measurement conditions and triggers secondary node change execution without waiting for network device instructions. This self-service approach enables timely execution while the subsequent feedback to the network device ensures proper resource management.
3Measurement precision
If the network device waits for terminal device feedback to release source secondary node resources, then resource release timing is accurate, but the overall process complexity increases
Solution Approach 1:
The terminal device provides feedback indication information to the network device when measurement conditions are met and secondary node change is executed. This feedback mechanism achieves precise resource release timing synchronized with actual condition fulfillment while using straightforward indication messages that minimize protocol complexity.
Data Source
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.