Terminal Device Blacklist Refresh for Card Validity
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Solution Overview
Problem
Existing credit card and IC card systems face issues with determining the validity/invalidity of cards that temporarily become invalid due to insufficient funds or other reasons, leading to incorrect processing when the card is later validated, as terminal computers may continue using outdated blacklists.
Innovation Solution
A system that includes a terminal device with an invalidity recording unit to compare an invalidity count specification value from a blacklist with a set value, executing processing based on validity information, and a server device to manage and distribute updated blacklists, ensuring accurate validity/invalidity determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the host computer distributes a blacklist to terminal computers when a card becomes invalid, then the terminal computer can detect invalid cards, but the terminal computer may continue using an outdated blacklist even after the card becomes valid again
Solution Approach 1:
The terminal computer performs preliminary actions by periodically checking for blacklist updates and automatically refreshing the blacklist before it becomes outdated. This ensures that when a card's status changes (from invalid to valid), the terminal computer already has the updated information ready, eliminating delays in recognition.
Solution Approach 2:
The system implements feedback mechanisms where the terminal computer sends usage information back to the host computer, which then determines whether to update the blacklist and redistributes it. This closed-loop feedback ensures that the terminal computer receives updated blacklist information promptly when card status changes occur.
2Duration of action of stationary object
If the terminal computer continuously operates without rebooting, then operational continuity is maintained, but the updated blacklist is not applied and cards are incorrectly determined as invalid
Solution Approach 1:
The terminal computer dynamically adjusts its operation by periodically refreshing the blacklist during continuous operation without requiring a full reboot. The system transitions from a static state (fixed blacklist) to a dynamic state (periodically updated blacklist), maintaining both operational continuity and information accuracy.
Solution Approach 2:
The terminal computer performs preliminary blacklist refresh operations during continuous operation, proactively updating its blacklist data before it becomes outdated. This preliminary action ensures that when card status changes occur, the terminal computer is already prepared with current information.
3Productivity
If the blacklist is updated only when cards change status, then update frequency is reduced, but terminal computers may not receive timely updates due to distribution delays
Solution Approach 1:
The terminal computer performs periodic checks for blacklist updates at predetermined intervals, independent of card status changes. This periodic action ensures that updates are received timely while maintaining efficient use of system resources, balancing productivity and reliability.
Solution Approach 2:
The host computer monitors terminal computer operations and determines whether blacklist updates are necessary based on feedback about card usage patterns. This selective feedback mechanism ensures updates are distributed efficiently only when needed, improving both productivity and timeliness.
Data Source
AI summary
The validity/invalidity of a credit card, an IC card storing electronic money, or the like is appropriately determined based on a blacklist. A terminal device includes a list storage means and an invalidity recording means. The list storage means stores an identifier, validity information indicating validity or invalidity, and a blacklist that relates the identifier to an invalidity count specification value for a recording medium storing a set value. The invalidity recording means reads from the blacklist, the invalidity count specification value related to the identifier read from the recording medium, and compares the invalidity count specification value with the set value read from the recording medium. The invalidity recording means executes predetermined processing based on the validity information for the recording medium when the set value is equal to the invalidity count specification value.