RFID Reader Error Recovery Through Tag Code Reconstruction
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Solution Overview
Problem
Conventional RFID reader systems face inefficiencies in data recovery due to errors in received tag transmissions, particularly in environments with interference, leading to slowed throughput and repeated requests for error-free versions.
Innovation Solution
The implementation of an RFID reader system capable of determining a fidelity criterion for the first received version and reconstructing a final version without requiring a second transmission, allowing for faster and more robust tag reading even in the presence of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RFID reader systems request repeated transmissions until an error-free version is received, then data accuracy is improved, but system throughput deteriorates
Solution Approach 1:
The patent applies preliminary action by performing error detection and correction processing on the first received version before requesting retransmissions. The reader system proactively reconstructs and corrects errors in the initial transmission using algorithms that analyze waveform segments and apply error correction codes, rather than waiting for failed transmissions to occur. This preliminary error handling reduces the need for repeated requests and maintains higher throughput while ensuring data accuracy.
2Reliability
If the system requests multiple versions of tag code to ensure error-free reception, then reliability is improved, but loss of time increases
Solution Approach 1:
The patent replaces the mechanical approach of requesting multiple physical transmissions with a signal processing approach. Instead of mechanically repeating the transmission request cycle when errors occur, the system substitutes this with electronic error correction algorithms that process the received waveform segments. These algorithms detect and correct bit errors by analyzing signal characteristics and applying correction codes, thereby maintaining reliability without the time penalty of repeated transmission requests.
3Loss of information
If the RFID reader uses traditional error detection methods requiring retransmission, then data integrity is improved, but device complexity increases due to repeated communication protocols
Solution Approach 1:
The patent extracts the error correction functionality from the communication protocol layer and implements it directly in the signal processing layer. By taking out the error handling mechanism from the protocol stack and embedding it in the waveform analysis and demodulation processes, the system maintains data integrity through direct signal processing rather than through complex protocol-based retransmission sequences. This extraction simplifies the overall system architecture by eliminating the need for multiple protocol handshakes and error recovery procedures.
Data Source
AI summary
RFID systems, devices, software and methods are adapted for receiving from an RFID tag at least waves that communicate at least a first version of its code. An output tag code is output that is the same as the first version, if a fidelity criterion is met regarding the first version. If not met, the output tag code is instead a final version that is reconstructed from the first version, and also from any additionally optionally subsequently received versions. In some embodiments, an error recovery block includes a subcomponent fidelity criterion checking block that can determine whether the fidelity criterion is met, and a code reconstruction block that can derive the final version.