RFID Tag Controller Managing Write Read Conflicts
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Solution Overview
Problem
RFID tags with displays face competition between writing and reading processes during updates, particularly when data length is long, leading to process failures and delays.
Innovation Solution
The RFID tag system sets a waiting time in its storage, allowing the controller to avoid conflicts between writing and reading processes by pausing after an update notification, ensuring that reading can commence only after the writing process is complete, with the waiting time adjusted based on the data length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the data length of information written into the RFID tag is increased to provide more comprehensive output information, then the information completeness is improved, but the writing process time is extended and competition with reading process increases
Solution Approach 1:
The controller performs a reading process before the writing process is completed. By anticipating the need to read the written information and initiating the read operation in advance, the system overlaps the read preparation with the writing execution, thereby reducing the total time loss without compromising information completeness.
2Productivity
If the writing process is performed without pausing to allow reading, then the productivity is improved, but process failures occur due to competition between writing and reading
Solution Approach 1:
The controller initiates the reading process in advance, before the writing process completes. This preliminary action allows the read operation to be prepared and queued, so that when writing finishes, the read can immediately proceed without causing process failure or requiring lengthy pauses that would reduce productivity.
3Reliability
If the controller waits for writing completion before reading, then process reliability is improved, but delays increase and productivity decreases
Solution Approach 1:
Instead of waiting passively for writing completion, the controller performs a preliminary reading action in advance. This overlapping of operations ensures that when the write finishes, the read is already prepared to execute immediately, thereby maintaining reliability while eliminating unnecessary delays and improving overall update efficiency.
4Reliability
If the waiting time is set to accommodate long data writing, then process reliability is improved, but the loss of time increases for shorter data updates
Solution Approach 1:
The controller performs reading in advance before writing completes, rather than waiting passively. This preliminary action eliminates the need for extended waiting periods regardless of data length, as the read operation is already prepared when writing finishes. This approach maintains reliability for long data writes while minimizing time loss for shorter updates.
Data Source
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AI summary
Provided are an RFID tag, having an information output function, and an RFID tag system which can prevent a conflict between a write process to a storage unit and a read process, even if the data length of information to be written to the storage unit is long. An RFID tag (10) comprises: an RFID device (15) having a storage unit (154) to which data can be written from a writing device by wireless communication; and a control unit (14) that reads information which is stored in the storage unit and is to be output, and causes the read information to be output from an output device (13). If subject information was written to the storage unit (154), the control unit (14) reads the subject information after a set standby time has elapsed. The storage unit (154) contains a storage region (158) to which standby time setting data can be written from the writing device.