RFID Transponder Circuit Integrity Check Optimization
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Solution Overview
Problem
RFID transponders face delays in responding to reader signals due to the need for additional data reading and integrity checks during start-up, which can exceed the time limits set by international standards, and performing these checks consumes power, reducing the operating range.
Innovation Solution
A radiofrequency transponder circuit that performs an integrity check only upon initial power-up by a reader field and sets a persistent flag to bypass subsequent checks for a predetermined time, allowing timely response to reader commands without repeated power consumption and maintaining operating range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an integrity check is performed during the start-up routine of an RFID transponder, then the reliability of the identifier data is improved, but the response time exceeds the maximum allowed time period specified by ISO15693
Solution Approach 1:
The integrity check is performed in advance during the first power-up sequence before the transponder enters normal operation mode. The result is stored in a persistent flag that remains valid across subsequent power-up events, eliminating the need to repeat the check and enabling timely responses within the ISO15693 specified time period.
Solution Approach 2:
Instead of repeatedly performing the full integrity check algorithm on each power-up, the transponder creates a copy of the verification result in the form of a persistent flag. This flag serves as a cached validation state that can be quickly retrieved without re-executing the computationally intensive checksum verification.
2Reliability
If an integrity check is performed on each power-up, then the risk of transmitting corrupted data is reduced, but the power consumption increases
Solution Approach 1:
The integrity check is performed periodically only at specific intervals rather than on every power-up event. Specifically, it is executed during the first power-up sequence and then skipped for subsequent power-ups within the same operational session, reducing the frequency of energy-intensive operations while maintaining data validity.
Solution Approach 2:
The transponder uses its own persistent flag mechanism to track whether an integrity check has already been performed, making the system self-aware of its validation state. This self-service approach eliminates the need for external coordination or repeated verification, allowing the transponder to autonomously skip redundant checks and conserve power.
3Measurement precision
If the start-up routine includes comprehensive integrity checks, then the accuracy of identifier verification is improved, but the operational range is reduced due to increased power requirements
Solution Approach 1:
The comprehensive integrity check is performed once in advance during the initial power-up sequence when the transponder first enters the reader field. This preliminary verification ensures high accuracy of identifier data while the persistent flag caches the result, allowing subsequent operations to proceed with reduced power consumption and extended operational range.
Solution Approach 2:
The system changes the operational parameter of integrity check frequency from continuous to conditional. By modifying the check frequency parameter based on the persistent flag state, the transponder achieves high verification accuracy when needed while reducing power consumption during normal operation, thereby extending operational range.
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
Enables RFID transponders to respond promptly to reader commands within the required time period while ensuring identifier validity, reducing power consumption and maintaining operating range by performing integrity checks only once and skipping them during subsequent power-ups.
Implementation Method 1
the transponder circuit being configured to respond to a reader command received via the antenna module (101) by the control circuit (103) reading and transmitting an identifier stored in the memory (104) via the antenna module (101)
Data Source
AI summary
The invention relates to radiofrequency transponder circuits, and in particular to such transponder circuits having a unique identifier. Embodiments disclosed include a radiofrequency transponder circuit (100) comprising an antenna module (101), a control circuit (103) and a memory (104), the transponder circuit (100) being configured to respond to a read command received via the antenna module (101) by the control circuit (103) reading and transmitting an identifier stored in the memory (104) via the antenna module (101), wherein the control circuit (103) is configured to perform an integrity check on data stored in the memory (104) upon being powered up by a reader field a first time via the antenna module (101) and to not perform the integrity check for a predetermined time period upon being powered up by a reader field subsequent times via the antenna module (101).