Secondary Key Update Logic for Conditional PSCell Changes
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Solution Overview
Problem
In wireless communication systems, terminals face challenges in accurately determining whether to update secondary keys during conditional primary secondary cell changes (CPC), leading to inconsistent understandings with network side devices and affecting communication security and performance.
Innovation Solution
A method for determining whether to update secondary keys based on first information, including serial numbers, indication information, or configuration identification lists, ensuring consistent understanding between terminals and network side devices regarding key updates during CPC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal autonomously determines whether to update the secondary key based on CPC configuration information, then the terminal can independently optimize communication security, but the terminal may have inconsistent understanding with the network side device leading to key update failures
Solution Approach 1:
The network side device provides feedback information (first information) to the terminal regarding whether the secondary key should be updated during CPC. This feedback mechanism ensures that the terminal's autonomous determination aligns with the network side device's key management decisions, preventing inconsistent understanding and key update failures while maintaining communication security.
Solution Approach 2:
The first information transmitted by the network side device acts as an intermediary that bridges the terminal's autonomous key update determination and the network side device's key management policy. This intermediary information ensures consistent understanding between both parties without requiring complex negotiation or additional signaling.
2Reliability
If the terminal always updates the secondary key during CPC, then communication security is maintained, but unnecessary key updates increase signaling overhead and processing complexity
Solution Approach 1:
The first information transmitted by the network side device contains parameter changes or indicators that specify whether the secondary key should be updated during CPC. By changing this parameter dynamically based on actual network conditions and security requirements, the system avoids unnecessary key updates while maintaining security when needed, thereby reducing processing complexity and signaling overhead.
3Measurement precision
If the terminal uses multiple types of first information (serial numbers, indication information, configuration identification lists) to determine key updates, then the accuracy of key update determination is improved, but the processing complexity and information overhead increase
Solution Approach 1:
The terminal processes multiple types of first information (serial numbers, indication information, configuration identification lists) only when necessary for accurate key update determination. The system applies partial processing - using the minimum required information types based on the specific CPC scenario - which maintains high determination accuracy while avoiding unnecessary processing complexity and information overhead in routine cases.
Data Source
AI summary
A secondary key updating method includes determining, by a terminal based on first information in a case of performing a CPC, whether to update a secondary key. The first information includes at least one of the following; a first serial number and/or a second serial number, indication information from a network side device, the indication information being used for indicating whether to update the secondary key, or a configuration identification list, the configuration identification list including an identification of a CPC configuration, and an SN to which a PSCell corresponding to the CPC configuration belongs is the same as or different from an SN to which a current serving PSCell belongs.