Wireless Device Key Change Noise Reduction
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Solution Overview
Problem
Existing wireless communication systems for cordless telephones face challenges in maintaining secure and reliable encryption key changes during calls, leading to potential noise and audio interruptions due to sequence errors and reception errors.
Innovation Solution
The system implements a method for dynamic encryption key changes by using a timer to initiate key changes and employs audio reduction mechanisms to manage errors, ensuring seamless transitions between encrypted and unencrypted states, thereby reducing noise and improving call quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption key changes are performed dynamically during calls, then security performance is improved, but sequence errors and reception errors occur leading to noise and audio interruptions
Solution Approach 1:
The system performs preliminary error detection by checking sequence numbers of received frames before completing the encryption key change. When a sequence error is detected, the key change process is aborted and the original key is maintained, preventing noise and audio interruptions caused by using incorrect encryption keys.
Solution Approach 2:
The system implements feedback mechanisms by continuously monitoring reception errors and sequence numbers during encryption key changes. Based on the feedback from error detection, the system dynamically adjusts the key change process - either completing it successfully or aborting it to maintain audio quality.
2Reliability
If encryption is activated immediately after wireless link establishment, then security is improved, but complexity of key management increases
Solution Approach 1:
The system implements self-service key management where the same key is used for both encryption and identification purposes. This eliminates the need for separate key management mechanisms, reducing complexity while maintaining security during the initial phase of communication.
3Manufacturing precision
If audio reduction is performed when sequence errors occur, then audio quality is maintained, but call continuity may be affected
Solution Approach 1:
The system performs preliminary detection of sequence errors before they can cause audio degradation. By detecting sequence number mismatches early in the key change process, the system can abort the key change and maintain the original encryption key, preventing audio quality degradation while maintaining call continuity.
Solution Approach 2:
The system prepares for potential sequence errors by having the original encryption key ready as a backup. When a sequence error is detected, the system seamlessly switches back to the original key without interrupting the call, cushioning against potential audio quality issues.
Data Source
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AI summary
A wireless communications device is constituted from a control station and a slave station that perform encryption communication using an encryption key and changes the encryption key in a predetermined procedure, during a call, and the device includes a controller that operates in such a manner that audio is reduced, if the procedure in which the encryption key is changed is not correctly executed, in a case where a change of the encryption key is made.