RFID Tag Selection via Transmission Output Control
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Solution Overview
Problem
In RFID-based goods sale systems, it is challenging to accurately specify the target RFID tag due to the coexistence of tags with different communication distances, leading to difficulties in determining which tag to communicate with, especially when the transmission output is variable.
Innovation Solution
The implementation of a communication control unit that adjusts the transmission output of the RFID reader and writer, and a data carrier determination unit that determines the validity of RFID tags based on their communication distance information, allowing the system to differentiate between tags with short and long communication distances by varying the transmission power and using a validity determination table to assess which tags are valid based on the output level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RFID tags with different communication distances coexist in the system, then the system can accommodate various goods sizes and communication requirements, but the transmission output becomes ambiguous and it becomes difficult to specify which data carrier is the communication target
Solution Approach 1:
The system performs preliminary actions by having RFID tags transmit their communication distance information during the communication establishment phase. The POS terminal records this information in a validity determination table before actual data communication occurs. This preliminary recording enables the system to later accurately identify and select the correct RFID tag based on the transmitted communication distance information, resolving the ambiguity of which tag is the communication target.
2Length of stationary object
If the transmission output of the radio communication device is increased to ensure communication with long-distance tags, then long-distance tags can be detected, but short-distance tags may also respond causing ambiguity in target specification
Solution Approach 1:
The system implements feedback by having RFID tags transmit their communication distance information back to the POS terminal during the communication establishment phase. The POS terminal uses this feedback information to update the validity determination table, which records which RFID tags are valid for each transmission output level. This feedback mechanism enables the system to accurately determine the intended communication target by matching the transmitted communication distance information with the recorded validity data, even when multiple tags are present.
Data Source
AI summary
An information processing apparatus according to an embodiment includes a communication control unit controlling communication of a radio communication device with a data carrier transmitting a signal including communication distance information regarding a communication distance; an output variable control unit varying transmission output of the radio communication device; and a data carrier determination unit determining that the data carrier having a short communication distance is valid as the transmission output is large, and determining that the data carrier having a long communication distance is valid as the transmission output is small.