Passive RFID Transponder Protocol Management
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Solution Overview
Problem
Existing passive RFID transponders fail to manage communication protocols effectively when multiple readers provide interrogation fields, leading to incomplete power-down states and intermediate protocol states, which can result in data security issues and protocol configuration problems.
Innovation Solution
A protocol management method for passive RF identification devices that includes field detectors for each interrogation field, allowing the device to enter a Standby state when power levels are maintained, and automatically restart communication protocols upon field detection, eliminating the need for a Power-On Reset (POR) signal and ensuring proper re-initialization and reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a passive RFID transponder uses multiple power sources from different readers, then the device can maintain power supply continuity and operate in dual-protocol mode, but the device may fail to enter complete power-down states leading to intermediate protocol states and data security issues
Solution Approach 1:
The patent implements a feedback mechanism where the transponder continuously monitors the presence of interrogation fields from multiple readers. Field detectors detect whether readers are present and actively transmitting, providing real-time feedback to the protocol management logic. This enables the transponder to dynamically adjust its operational state - entering standby mode when fields are detected and maintaining power supply, versus entering power-down mode when fields are absent. The feedback loop ensures that protocol execution states align with the actual presence of readers, preventing intermediate states and associated security vulnerabilities.
2Ease of operation
If the transponder enters standby state during protocol execution, then protocol restart can be triggered automatically upon field detection, but the device complexity increases due to multiple field detectors and protocol management logic
Solution Approach 1:
The patent merges the field detection functionality with the existing power harvesting circuitry. The same antenna structure that receives electromagnetic energy for power generation is also used to detect the presence of interrogation fields. The rectifier circuit that converts RF energy to DC voltage inherently provides information about field presence - when RF energy is detected, the rectifier produces voltage, which simultaneously serves both power supply and field detection purposes. This merging eliminates the need for separate field detector circuits, reducing device complexity while maintaining automatic protocol restart capability.
3Reliability
If the transponder continuously monitors interrogation fields, then protocol execution can be properly managed and restarted, but energy consumption increases
Solution Approach 1:
The transponder utilizes its own power harvesting operation to perform field monitoring without additional energy expenditure. The rectifier circuit, which is already active to convert RF energy to power, inherently monitors for the presence of interrogation fields as part of its normal operation. The voltage output from the rectifier serves dual purposes: powering the device and indicating field presence. This self-service approach allows continuous field monitoring while incurring no extra energy cost beyond what is already required for power generation.
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 communication protocols from remaining in indefinite or intermediate states, ensuring secure data handling and correct protocol execution by triggering restarts based on field detection, thereby maintaining data integrity and protocol configuration accuracy.
Implementation Method 1
a passive RF identification device (RFID) which is arranged for harvesting power from at least a first reader sending a first interrogation field at a first frequency and from an independent second reader sending a second interrogation field at a second frequency
Data Source
AI summary
The protocol management method concerns a RFID transponder which comprises first and second field detectors respectively for first and second interrogation fields in order to watch for the reception of these first or second interrogation fields at least respectively during executions of corresponding first and second communication protocols. If during the execution of a communication protocol the reception of the corresponding interrogation field is no more detected by the corresponding field detector while the power provided by the power generator remains equal or superior to the requested power level, then this communication protocol is stopped and the RFID transponder enters a Standby state. When the transponder is in this Standby state, the corresponding field detector continues to watch for the reception of the corresponding interrogation field in order to detect if it is again received and, if this is the case, to trigger a restart of this corresponding communication protocol.