Master Node Control for Conditional PS Cell Change Continuity
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Solution Overview
Problem
In the context of 3GPP technical specifications for mobile communication systems, the selective activation of secondary nodes in dual connectivity is not appropriately performed due to the release of resources by the master node, leading to potential access failures when the communication apparatus changes secondary nodes based on conditional PS cell change configurations.
Innovation Solution
The master node is configured to transmit a modification request message to a source secondary node when it is a candidate node and a release request message when it is not, ensuring that resources are not unnecessarily released, thereby allowing seamless transitions and maintaining connectivity during selective activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the master node transmits a release request message to the source secondary node after conditional PS cell change, then resources are released to enable node switching, but the source secondary node may be a candidate node for future activation leading to access failures
Solution Approach 1:
The master node determines in advance whether the source secondary node is a candidate node before transmitting the release request message. This preliminary determination prevents premature resource release by identifying nodes that may be needed for future selective activation, thereby maintaining both network connectivity and activation capability.
Solution Approach 2:
The system dynamically adjusts the resource release decision based on the candidate node status. When the source secondary node is identified as a candidate node, the release request message is not transmitted, preserving resources for potential future activation. This dynamic approach allows the system to adapt to changing network conditions and mobility requirements.
2Productivity
If the master node releases resources at the source secondary node after secondary node change, then resource utilization is optimized, but seamless transitions during high-speed movement cannot be ensured
Solution Approach 1:
The master node performs preliminary determination of candidate node status before initiating resource release. This advance identification ensures that resources are preserved at nodes that will be needed for seamless transitions during high-speed user equipment movement, while still optimizing resource utilization at non-candidate nodes.
Solution Approach 2:
The system uses feedback from the candidate node determination process to control resource release decisions. This feedback mechanism ensures that resource release actions are taken only when they will not compromise future activation capabilities, thereby maintaining both efficiency and reliability.
3Device complexity
If the master node transmits release request message to all secondary nodes after PS cell change, then resource management is simplified, but candidate nodes cannot maintain resources for future activation
Solution Approach 1:
The master node performs preliminary determination of candidate node status before transmitting release request messages. This preliminary action adds a decision step that prevents simplified blanket resource release, thereby preserving adaptability for future conditional reactivation while adding minimal complexity to the resource management process.
Data Source
AI summary
A master node according to an embodiment is a master node connected to a communication apparatus. The master node comprises a controller configured to control a procedure for the communication apparatus to perform a conditional PS cell change based on a primary secondary (PS) cell configuration, a receiver configured to receive a radio resource control (RRC) reconfiguration complete message based on the conditional PS cell change from the communication apparatus, and a transmitter. In the procedure, the transmitter is configured to transmit a modification request message to a source secondary node when the receiver receives the RRC reconfiguration complete message and the source secondary node is a candidate secondary node, and is configured to transmit a release request message to the source secondary node when the receiver receives the RRC reconfiguration complete message and the source secondary node is not a candidate secondary node.