RFID Tag Activation Control via Segmented Timeslots
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Solution Overview
Problem
Current RFID tag management systems face challenges with simultaneous tag activation leading to signaling collisions and increased time required for data reading as the number of tags increases, necessitating improved control over wireless identification tag activation.
Innovation Solution
Implementing a method where multiple RFID read cells activate overlapping communication ranges in a rolling manner, with each tag receiving a unique identifier-based timeslot for data transmission, allowing for sequential and collision-free data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple RFID tags are simultaneously activated by a read cell, then data collection from multiple tags occurs in parallel, but signaling collisions occur between tags
Solution Approach 1:
The patent segments the simultaneous data transmission process into sequential timeslots. Each RFID tag is assigned a unique identifier that determines its specific timeslot for transmission, dividing the overlapping communication ranges into discrete time segments. This segmentation eliminates signal collisions while maintaining parallel activation of multiple tags across different timeslots.
Solution Approach 2:
The patent implements periodic action by organizing tag data transmissions into repeating cycles of timeslots. Each timeslot is periodically assigned to specific tags based on their unique identifiers, creating a rhythmic transmission pattern that prevents collisions. The read cell periodically cycles through multiple tags in sequence, ensuring reliable communication while maintaining high productivity.
2Reliability
If collision avoidance techniques use random waiting periods, then signal collisions are reduced, but the time needed to read data from all tags increases
Solution Approach 1:
The patent changes the parameter of transmission timing from random waiting periods to deterministic timeslot assignments. Each tag's transmission time is determined by a specific parameter (its unique identifier) that maps to a predetermined timeslot. This parameter-based timing eliminates the need for random delays while preventing collisions, significantly reducing the total data reading time compared to random backoff methods.
3Quantity of substance
If a single read cell activates all tags in its range, then complete tag coverage is achieved, but the time to read all tags increases with the number of tags
Solution Approach 1:
The patent adds the time dimension to the spatial coverage problem. Instead of attempting to read all tags simultaneously in a single time dimension (which causes collisions), the system extends the solution into the time dimension by assigning different timeslots to different tags. This dimensional transformation allows complete tag coverage to be achieved without increasing total reading time, as multiple tags are activated in parallel across the time dimension.
Data Source
AI summary
Methods and systems for controlling wireless identification tag activation are disclosed. An example method includes controlling a first wireless identification read cell to activate a first set of wireless identification tags within a first communication range. Further, the method includes controlling a second wireless identification read cell to activate a second set of wireless identification tags within a second communication range during activation of the first set of wireless identification tags and subsequent to initially activating the first set of wireless identification tags. The first communication range overlaps with the second communication range.