Active Wireless Transaction Device Signal Strength Threshold Control
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Solution Overview
Problem
In wireless transaction systems, active devices can complete transactions with multiple terminals simultaneously due to their broader range, leading to potential duplicate transactions, which passive devices cannot handle due to range constraints.
Innovation Solution
Implementing a signal strength threshold on active devices to emulate the range of passive devices, preventing transactions with terminals outside the range that passive devices can communicate with, by measuring and comparing the signal strength with a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If active devices are used to conduct wireless transactions, then the transaction range is extended beyond passive device limitations, but duplicate transactions with multiple terminals may occur
Solution Approach 1:
The system changes the parameter of signal strength threshold to distinguish between valid and invalid transaction ranges. By measuring the signal strength and comparing it against a predetermined threshold, the system can determine whether a terminal is within the legitimate transaction range, thus preventing duplicate transactions while maintaining extended range capability.
Solution Approach 2:
The system implements feedback by continuously monitoring signal strength measurements and using this information to control transaction completion. The signal strength measurement provides feedback about the distance and validity of the transaction, allowing the system to make informed decisions about whether to proceed with the transaction, thereby preventing duplicate transactions with multiple terminals.
2Reliability
If signal strength threshold is implemented on active devices, then duplicate transactions are prevented, but additional measurement and control mechanisms are required
Solution Approach 1:
The active device performs self-service by autonomously measuring its own signal strength and making transaction decisions based on predetermined thresholds. The device uses its existing transceiver to measure signal strength without requiring external measurement equipment, and automatically controls transaction completion based on the measured values, reducing the need for additional system complexity.
Solution Approach 2:
The signal strength measurement acts as an intermediary parameter that mediates between the physical distance and the transaction decision. Rather than directly controlling transaction range through hardware limitations, the system uses signal strength as an intermediate indicator to indirectly control whether transactions should proceed, simplifying the overall control mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents duplicate wireless transactions by ensuring active devices only complete transactions with terminals within the range that passive devices can power and communicate with, thereby aligning the transaction range with passive device capabilities.
Implementation Method 1
passive devices, such as near-field communication (NFC) cards, may be used to conduct wireless transactions with wireless transaction terminals, such as NFC readers. The passive devices may not include power sources and instead may be powered by currents induced by the signals transmitted by the wireless transaction terminals.
Data Source
AI summary
A device implementing a system for preventing duplicate wireless transactions includes a wireless communication controller that is configured to receive a signal for conducting a wireless transaction with a wireless transaction terminal. The wireless communication controller is further configured to determine whether a transaction type of the wireless transaction is associated with a signal strength threshold. The wireless communication controller is further configured to measure a signal strength associated with the wireless transaction upon determining that the transaction type of the wireless transaction is associated with the signal strength threshold. The wireless communication controller is further configured to prevent the wireless transaction from completing when the transaction type of the wireless transaction is associated with the signal strength threshold and the measured signal strength fails to satisfy the signal strength threshold, otherwise allow the wireless transaction to complete.