PDA Module Direct SIM Access in Composite Terminals
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Solution Overview
Problem
In composite terminals, the PDA module cannot directly access the SIM, leading to time-consuming data retrieval and increased error probability due to information collisions, as it relies on the phone module for subscriber identification and user data, which restricts its functionality and efficiency.
Innovation Solution
A method allowing the PDA module to directly access and read subscriber identification information and user data from the SIM by determining the presence of a request signal and ensuring proper SIM access, including checks for mechanical and operational integrity to prevent power wastage and errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the PDA module accesses SIM data through the phone module, then the SIM access structure is simple and maintained, but the data retrieval time increases and error probability increases due to information collisions
Solution Approach 1:
The patent segments the SIM access authority by creating separate access paths for the phone module and PDA module. The PDA module is granted direct access rights to the SIM, dividing the previously monolithic access structure into independent access channels. This segmentation eliminates the bottleneck where the PDA module had to route all SIM data requests through the phone module, thereby reducing data retrieval time without significantly increasing overall system complexity.
2Productivity
If the PDA module directly accesses the SIM, then data retrieval speed increases, but the risk of power wastage and errors increases without proper access control
Solution Approach 1:
The patent implements preliminary action by establishing access control mechanisms and integrity checks before the PDA module directly accesses the SIM. The system pre-configures access permissions, validates SIM operational status, and sets up error handling protocols in advance. This preliminary preparation ensures that when the PDA module directly accesses the SIM for fast data retrieval, proper safeguards are already in place to prevent power wastage and errors, thus maintaining reliability while achieving high productivity.
3Ease of operation
If the SIM is accessible exclusively by the phone module, then security and access control are maintained, but the PDA module functionality is restricted and inefficient
Solution Approach 1:
The patent applies universality by making the SIM accessible to multiple modules (both phone module and PDA module) while maintaining centralized access control. The SIM transitions from being exclusively accessible by the phone module to a multi-functional resource that serves both modules. Access control security is preserved through permission-based access mechanisms that authenticate and authorize each module's access requests, ensuring that expanded functionality does not compromise security.
Data Source
AI summary
A method for accessing an SIM in a composite terminal. The method includes determining, by a Personal Digital Assistant (PDA) module, whether a subscriber identification information request signal occurs; and directly accessing the SIM and reading the subscriber identification information stored in the SIM when the subscriber identification information request signal occurs.