Mobile Terminal Session Switching Between Clear and Encrypted Modes
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Solution Overview
Problem
Current methods for switching between clear and scrambled sessions in mobile communication require network device cooperation, are complex, and lack end-to-end control, resulting in high implementation costs and inefficient transmission.
Innovation Solution
A method and system allowing mobile terminals to initiate end-to-end switch control between clear and scrambled sessions using end-to-end signaling messages for key negotiation and session transfer, eliminating the need for network device participation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network device cooperation is used for session switching, then session switch reliability is improved, but device complexity and implementation cost increase
Solution Approach 1:
The patent extracts the session switching control function from network devices and relocates it to terminal devices. The terminal autonomously initiates and completes the switching process between clear and scrambled sessions without requiring network device participation, thereby reducing network device complexity while maintaining switching reliability through end-to-end control
Solution Approach 2:
The terminal device performs self-service by autonomously negotiating encryption parameters, generating encryption keys, and controlling session switching without external network assistance. This self-contained approach eliminates the need for complex network device coordination while ensuring reliable session management
2Adaptability or versatility
If in-band signaling is used for session control, then network compatibility is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent introduces a dedicated control message mechanism as an intermediary for session management. Instead of embedding control information in voice channels (in-band signaling), the system uses separate out-of-band control messages to negotiate and switch sessions, dramatically improving transmission efficiency while maintaining network compatibility through standardized message formats
3Reliability
If multiple network devices cooperate for session switching, then session switch reliability is improved, but loss of time increases
Solution Approach 1:
The patent removes multiple network devices from the session switching path, reducing the number of coordination steps. By enabling direct terminal-to-terminal switching, the system eliminates unnecessary network device involvement while maintaining reliability through end-to-end encryption key negotiation and session control
Solution Approach 2:
The terminal devices perform preliminary key negotiation and encryption parameter setup in advance, so that when session switching is triggered, the transition can occur rapidly without time-consuming network device coordination. The encryption framework is pre-established, enabling quick switching between clear and scrambled sessions
Data Source
Figure 1~2
AI summary
The present invention discloses a method for clear session and scrambled session communication handover between mobile terminals comprising: a first terminal initiating a scrambled session handover control request to a second terminal, and the second terminal returning a scrambled session handover control response after receiving the scrambled session handover control request; and the first terminal initiating a key negotiation process with the second terminal after receiving the scrambled session handover control response returned by the second terminal, and then transferring to scrambled session communication or suspending the scrambled session communication with the second terminal; wherein the scrambled session handover control request includes a scrambled session request or a clear session request. The present invention further provides a system for clear session and scrambled session communication handover between mobile terminals comprising a scrambled session handover control module and an encryption module set in a mobile terminal. The present invention protects end-to-end security in the communication process of the mobile terminals effectively.