RFID Tag Data Writing With Segmented Acknowledgment
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Solution Overview
Problem
Conventional RFID systems face inefficiencies due to slow response times for writing data into non-volatile memory, leading to reduced communication capacity and missed tag identification during writing operations, as the reader waits for acknowledge signals from tags.
Innovation Solution
The method allows the reader to communicate with other tags while a first wireless data carrier is processing data with its slow response element, using modulation techniques that minimize energy reduction and implement anti-collision arbitration to handle simultaneous signals, enabling continuous communication and efficient energy supply during writing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reader waits for the tag to complete writing operations before communicating with other tags, then data writing reliability is ensured, but communication capacity and tag identification efficiency are reduced
Solution Approach 1:
The patent segments the tag's response into two independent parts: a fast Acknowledge signal indicating writing operation initiation, and a separate Write Completed signal indicating writing operation completion. This segmentation allows the reader to receive confirmation that writing has started without waiting for the entire slow writing process to finish, enabling the reader to continue communicating with other tags while the first tag performs its writing operation, thus resolving the contradiction between reliability and communication capacity.
2Reliability
If the reader waits for the tag to complete writing operations, then data integrity is maintained, but tag identification during writing operations is lost
Solution Approach 1:
By segmenting the acknowledgment into two separate signals (Acknowledge and Write Completed), the system allows the reader to receive immediate confirmation that writing has begun and to continue identifying and communicating with other tags. The data integrity is maintained because the tag still completes its writing operation, but the reader no longer loses tag identification information during the waiting period.
3Productivity
If the reader continuously communicates with multiple tags, then communication capacity is maximized, but energy supply to passive tags may become insufficient
Solution Approach 1:
The patent implements periodic action by having the reader alternate communication between different tags rather than continuously communicating with one tag. When one tag is performing a writing operation, the reader switches to communicate with other tags, creating a periodic communication pattern that maximizes overall system capacity while ensuring each tag receives sufficient energy supply during its active communication periods.
Data Source
AI summary
The invention relates to a method of operating a RFID system comprising at least one reader (1) and a plurality of wireless data carriers (2), each of which comprise at least one data processing element with slow response (5), wherein the method controls the at least one reader (1) to continuously communicate with one of the plurality of wireless data carriers (2), while at least another one of the plurality of wireless data carriers (2) is processing data with its at least one slow response element (5). The invention further relates to a RFID system comprising at least one reader (1) and a plurality of wireless data carriers (2), each of which comprises at least one slow response element (5), wherein the system is capable to continuously communicate with at least one of the plurality of wireless data carriers (2), while at least another one of the plurality of wireless data carriers (2) is processing data with its at least one slow response element (5).