Master Node PS Cell Change for Secondary Node Resource Retention
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Solution Overview
Problem
In mobile communication systems conforming to 3GPP standards, the selective activation of secondary nodes during high-speed user equipment movement is not appropriately performed due to the release of resources by the master node, leading to potential access failures.
Innovation Solution
A master node controller transmits a modification request message to a candidate secondary node when an RRC reconfiguration complete message is received, and a release request message when the node is not a candidate, ensuring appropriate resource management during selective activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the master node transmits a release request message to the source secondary node after conditional PS cell change, then resource management is simplified, but resource release occurs prematurely causing access failures during selective activation
Solution Approach 1:
The master node transmits a modification request message to the source secondary node before the conditional PS cell change is executed, preparing the node for potential future access without releasing resources prematurely. This preliminary action maintains resource availability while simplifying subsequent management.
Solution Approach 2:
The patent changes the parameter of resource release timing from 'immediate after conditional PS cell change' to 'deferred until actual access occurs'. This parameter change prevents premature resource release while maintaining simplified resource management through the modification request mechanism.
2Productivity
If resources are released after conditional PS cell change, then resource allocation efficiency improves, but continuous communication is interrupted during high-speed movement
Solution Approach 1:
The modification request message is transmitted in advance to prepare the source secondary node for potential re-access, maintaining resource availability without preventing resource allocation efficiency. The node is notified of the conditional change but resources remain allocated until actually needed.
Solution Approach 2:
The resource allocation becomes dynamic rather than static - resources are maintained in a ready state and can be quickly reactivated when needed during high-speed movement, rather than being permanently released or permanently held. This dynamic approach balances efficiency and continuity.
3Adaptability or versatility
If the master node transmits modification request message to candidate secondary node, then resource availability is maintained for selective activation, but message transmission overhead increases
Solution Approach 1:
The modification request message is transmitted selectively to only those secondary nodes that are candidates for selective activation, rather than to all secondary nodes. This localized approach maintains adaptability for selective activation while minimizing unnecessary message transmission overhead.
Data Source
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AI summary
A master node according to an embodiment is a master node (200, 200M) connected to a communication apparatus (100). The master node comprises a controller (230) 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 (212) 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 (221). 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.