RFID Reader Triggering Device for Signal Collision Prevention
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Solution Overview
Problem
In RFID systems, signal collisions between multiple RFID readers and transponders can occur when query signals are sent at different times, leading to destructive overlay and failure in achieving the necessary depth of modulation, which hinders reliable identification and location of RFID transponders.
Innovation Solution
A communication device with a triggering device coordinates the simultaneous sending of query signals by multiple RFID readers, ensuring they are ready to send signals at the same time, preventing collisions and increasing field strength for improved reading range and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple RFID readers send out query signals at different points in time, then the system can operate with multiple readers, but signal collisions occur and destructive overlay prevents achieving the necessary depth of modulation
Solution Approach 1:
The triggering device checks whether the RFID readers are ready to send the query signal before activating them. This preliminary readiness check ensures that all readers are synchronized and prepared to transmit simultaneously, preventing signal collisions and destructive overlay that would otherwise occur with unsynchronized transmission from multiple readers
Solution Approach 2:
The system uses periodic triggering signals to activate RFID readers in a coordinated manner. The triggering device sends triggering signals at specific intervals to synchronize the query signal transmission from multiple readers, ensuring they operate in a rhythmic, coordinated fashion that prevents collisions while maintaining high identification reliability
2Power
If multiple RFID readers send out query signals simultaneously, then the field strength increases through constructive overlaying, but coordination complexity increases
Solution Approach 1:
The triggering device serves as an intermediary between multiple RFID readers, coordinating their operation. It checks readiness status and sends triggering signals to activate readers simultaneously, enabling constructive overlaying of signals for increased field strength while centralizing the coordination function to manage complexity
3Reliability
If sequential activation of RFID readers is used, then signal collisions are prevented, but the reading range and efficiency are reduced
Solution Approach 1:
The triggering device performs preliminary readiness checks on all RFID readers before activation. This ensures that readers are prepared to transmit simultaneously, allowing the system to achieve both collision prevention (through synchronized timing) and high productivity (through parallel operation of multiple readers)
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
This approach allows for reliable identification and location of RFID transponders by constructively overlaying signals, increasing the reading range of passive RFID transponders and preventing signal collisions, thereby achieving the required depth of modulation.
Implementation Method 1
The query signal is sent out in the form of an alternating magnetic field
Implementation Method 2
This operating mode of the communication device makes an increase in the field strength at a specific position in the space possible by the constructive overlaying of the signals that are sent out by the RFID readers distributed in the space
Data Source
AI summary
A communication device is provided for identifying and/or locating an RFID transponder. The communication device includes a first RFID reader and at least one second RFID reader. The first and/or the at least one second RFID reader is configured to send out a query signal to the RFID transponder and to receive a response signal from the RFID transponder. The communication device also includes a trigger device configured to send a trigger signal to the first and/or the at least one second RFID reader, and as a result of which, the first and/or the at least one second RFID reader is configured to send out the query signal.