Portable Data Carrier Presence Recognition via Direct Communication
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Solution Overview
Problem
Current systems for portable data carriers, such as electronic health cards and doctor's health professional cards, face challenges in direct presence recognition without involving an RFID reading device, as they lack means for load modulation detection and require authentication through a terminal, which can remain valid even if the health professional card is removed.
Innovation Solution
Implementing a system with a contactless interface and an electronic circuit that includes an additional communication means, such as an optical transceiver or NFC interface, allowing for a direct communication channel between the data carriers to enable presence recognition independently of the reading device, using frequencies like UHF or 13.56 MHz for energy transfer and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If authentication is initiated by a terminal with tunneling through a security module, then authentication can be performed between data carriers, but the authentication remains valid even if one data carrier is removed, making presence recognition impossible
Solution Approach 1:
The patent introduces a radio wave detector as an intermediary component that enables direct detection of the second data carrier's presence through its antenna emissions. This intermediary device allows the first data carrier to verify the continued presence of the second data carrier without relying on the terminal's authentication tunneling, thereby solving the presence recognition problem while maintaining authentication reliability.
2Difficulty of detecting and measuring
If a load modulation detector is added to enable direct communication between data carriers, then presence recognition becomes possible, but the device complexity increases
Solution Approach 1:
The patent leverages the second data carrier's own antenna and radio wave emissions as the detection signal source. Instead of requiring the first data carrier to have complex active detection capabilities, the system uses the second data carrier's inherent radio wave transmission (which it already performs for communication) as the signal for presence detection. This self-service approach enables presence recognition without adding complex active detection hardware to the first data carrier.
3Ease of operation
If direct communication between data carriers is implemented using RFID fields, then communication is possible, but the reading device must be involved, preventing independent presence recognition
Solution Approach 1:
The patent extracts the presence recognition function from the terminal-based authentication system and implements it directly between data carriers. By having the first data carrier detect the second data carrier's antenna emissions independently, the system removes the terminal from the presence recognition process. This extraction enables autonomous presence verification between data carriers without requiring the reading device's continued involvement.
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 reliable and cost-effective direct communication between data carriers for presence recognition, ensuring the presence of the second data carrier is verified before allowing access or executing commands, and allows for secure authentication without relying on the reading device.
Implementation Method 1
an RFID reading device, around the antenna of which there is formed, in operation, a field within which the reading device supplies present contactless data carriers via their respective antennas with energy
Implementation Method 2
the further communication means of the first and second data carrier comprises an optical transceiver
Data Source
AI summary
A system for recognizing the presence of a second portable data carrier by a first portable data carrier, wherein the data carriers have respectively a contactless interface with an antenna and an electronic circuit for storing and/or processing data. An RFID reading device supplies the data carriers with energy and for the respective communication of the data carriers with the reading device. In the first and the second data carrier there is respectively provided a further communication device, via which an additional, direct communication channel, independent of the field of the reading device, is made available between the first and the second data carrier, to thereby check the immediate presence of the second data carrier in the field of the reading device by the first data carrier.