Cell Update Security Configuration Synchronization
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Solution Overview
Problem
During cell updates, security configuration mismatches between mobile terminals and networks can occur due to delays in acknowledging new security configurations, leading to potential loss of service, especially with legacy terminals that do not provide necessary information elements in cell update messages.
Innovation Solution
Incorporating a security configuration information element in cell update messages to indicate whether the mobile terminal has applied an updated or prior security configuration, allowing the network to determine the correct configuration without needing to check the terminal's capabilities, thus ensuring synchronization and preventing service loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network waits for acknowledgment before completing security configuration transition, then security configuration synchronization is improved, but service continuity deteriorates due to cell update delays
Solution Approach 1:
The mobile terminal determines its security configuration status (whether it has reverted to prior configuration) before sending the cell update message, and includes this determination in the message. This preliminary action allows the network to immediately respond with the correct security configuration without waiting for additional acknowledgments, thus maintaining synchronization while avoiding service interruption.
Solution Approach 2:
The cell update message includes feedback information about the mobile terminal's security configuration status. This feedback enables the network to understand whether the terminal has reverted to prior configuration and respond appropriately, creating a closed-loop control system that maintains security synchronization without requiring the network to guess or wait for separate acknowledgment messages.
2Measurement precision
If the network upgrades to recognize security configuration information elements, then security configuration accuracy is improved, but device compatibility deteriorates with legacy terminals
Solution Approach 1:
The cell update message structure is designed to be universal, accommodating both legacy terminals and upgraded terminals. The message includes security configuration status information in a format that upgraded terminals can populate and send, while legacy terminals can send without this information. The network is configured to handle both cases - interpreting messages with the new information element when present, and messages without it when from legacy terminals, thus maintaining backward compatibility while enabling enhanced functionality.
3Measurement precision
If the network checks terminal capabilities to determine security configuration, then configuration accuracy is improved, but implementation complexity deteriorates
Solution Approach 1:
The mobile terminal self-identifies its security configuration status by including this information directly in the cell update message. This self-service approach eliminates the need for the network to check terminal capabilities or maintain capability databases, as the terminal provides its own configuration status information. The network simply reads the included information and responds accordingly, significantly reducing implementation complexity.
Data Source
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AI summary
A method, apparatus and computer program product are provided for maintaining synchronization with respect to the security configurations of the network and a mobile terminal, even during a cell update procedure. A method may include causing a cell update message to be provided during performance of a cell update procedure and including, with the cell update message, a security configuration information element indicating that a mobile terminal has applied an updated security configuration in an instance in which the mobile terminal has applied the updated security configuration. The method may also include, with the cell update message, the information element indicating that the mobile terminal has reverted to a prior security configuration in an instance in which the mobile terminal has reverted to a prior security configuration.