Radio Base Station Candidate-Cell Messaging for Secure CPAC Transitions
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Solution Overview
Problem
The application of selective activation in conditional secondary cell addition/change procedures in 5G communication systems poses security challenges due to the inability of new secondary nodes to recognize the configuration information of candidate cells maintained by user equipment, leading to difficulties in configuring execution conditions for the procedures.
Innovation Solution
A radio base station is equipped with a control unit that manages the execution of secondary cell addition/change procedures and a transmission unit that sends messages to transition target secondary nodes, including information about candidate cells and configuration details maintained by the user equipment, ensuring secure and efficient transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If selective activation is applied to maintain CPAC configuration without releasing it each time, then flexibility in changing cell group is improved, but security problems occur because the new secondary node cannot recognize the candidate secondary cell configuration information maintained by the terminal
Solution Approach 1:
The patent introduces a new intermediary message structure that includes both the candidate secondary cell configuration information and the execution condition configuration information. This intermediary message allows the terminal to transmit stored configuration data to the new secondary node, enabling the node to recognize and properly configure execution conditions without releasing the CPAC configuration, thus resolving the security recognition problem while maintaining flexibility.
2Productivity
If the terminal maintains configuration information of candidate secondary cells for efficient transitions, then mobility performance is improved, but the new secondary node cannot recognize this configuration information leading to inability to configure execution conditions
Solution Approach 1:
The patent applies preliminary action by having the terminal store and maintain the candidate secondary cell configuration information in advance before transition occurs. The new secondary node then retrieves this pre-stored information through the enhanced message structure, enabling immediate recognition and configuration without requiring reconfiguration or restarting the CPAC procedure, thus maintaining mobility efficiency while preventing information loss.
3Reliability
If CPAC procedure is reconfigured and restarted each time to ensure proper configuration recognition, then security and correctness are improved, but productivity and efficiency of cell group change deteriorates
Solution Approach 1:
The patent enables continuity of useful action by allowing the CPAC configuration to be maintained without release between cell group changes. The enhanced message structure ensures that configuration information is continuously transmitted and recognized by new secondary nodes, eliminating the need to restart the CPAC procedure while maintaining configuration correctness, thus improving both reliability and productivity.
Data Source
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AI summary
A radio base station is provided that can execute CPAC surely even when selective activation is applied and the CPAC is partially operated. The radio base station includes a control unit that controls an execution of an addition/change procedure of a secondary cell, and a transmission unit that transmits a message to a transition target secondary node for a terminal when executing the addition/change procedure, the message including information of a candidate secondary cell that is a transition target maintained by the terminal.