Smart Card Identifier Table for Memory-Constrained Terminals
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Solution Overview
Problem
Integrated circuit cards face challenges in managing multiple identifiers for the same application due to heterogeneous terminal evolution and limited memory resources, leading to cumbersome and costly operations during system migrations and updates.
Innovation Solution
A method that associates a single reference to all identifiers of a file in a table, allowing the card to consult this table upon identifier calls and use the associated file for exchanges, reducing memory usage and access time by avoiding deep memory searches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple copies of the same application are recorded under different identifiers to ensure compatibility with heterogeneous terminals, then the card can operate on different terminal systems, but memory consumption increases and management complexity rises
Solution Approach 1:
The patent merges multiple identifier references to a single application file. Instead of storing separate application copies for each identifier, the system creates a unified application file that can be accessed through multiple identifiers, thereby reducing memory consumption while maintaining compatibility with different terminal systems.
Solution Approach 2:
The patent implements a universal application file structure that serves multiple terminal systems simultaneously. The application file is designed to be universally accessible through different identifiers, allowing a single file to fulfill multiple functions across heterogeneous terminal environments without requiring separate copies.
2Adaptability or versatility
If multiple copies of the same application are recorded under different identifiers, then the card can communicate with different terminal versions, but the management and synchronization of user data becomes complex and time-consuming
Solution Approach 1:
The patent combines user data management into a single centralized location associated with the unified application file. Updates to user data are performed once in this central location and are automatically reflected across all identifier references, eliminating the need for manual synchronization across multiple copies and significantly reducing the time required for data management.
3Quantity of substance
If the entire fleet of terminals is updated to reuse the same identifier, then memory usage is reduced, but the operation becomes impossible to implement due to the requirement for instantaneous update
Solution Approach 1:
The patent segments the identifier management system into two parts: the application file structure (which uses a single unified file) and the identifier reference layer (which maintains multiple identifier mappings). This segmentation allows the card to use minimal memory for the application file while preserving backward compatibility through multiple identifier references, making the solution both memory-efficient and easily implementable without requiring fleet-wide terminal updates.
Data Source
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AI summary
A method for managing the file identifiers in a portable data carrier having an integrated circuit by a table of identifiers associating a given reference with each identifier of a given file. A portable data carrier having an integrated circuit arranged to implement this method.