Collision Resolution in ISO 18000-6c Passive RFID
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Collision Resolution in ISO 18000-6c Passive RFIDAbstract
According to the ISO 18000-6c passive RFID standard (EPCglobal Gen 2), in a tag intensive environment, when multiple tags receive the reader Query command and respond simultaneously, the reader may receive multiple responses giving what is termed a collision or a collision signal. This paper reports a method for resolving the two tag collision condition in real time thus not requiring any additional input by the reader. A reader has been designed using a National Instruments set of equipment which includes an FPGA-based software defined reader. The collision signal is obtained from the data acquisition system and processed by the FPGA in real time. This is a straightforward algorithm that can be implemented in silicon or programmed in a microprocessor to replace the current FPGA.
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