RFID Reader Antenna State Alternation for Inventory Tracking
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Solution Overview
Problem
RFID readers in retail environments face challenges in accurately tracking merchandise on sales floors, leading to inefficiencies in inventory management due to excessive or insufficient data generation, particularly when items are moved within the store, resulting in missed sales opportunities.
Innovation Solution
Configuring multiple antennas within an RFID reader to operate in alternating sessions and states, ensuring that RFID tags are read when moved between regions, balancing data generation to provide accurate inventory tracking without excessive or insufficient data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID readers continuously read tags in session 0 or session 1, then tag detection coverage is improved, but excessive data is generated making it difficult to manage
Solution Approach 1:
The patent applies periodic action by implementing a state machine that transitions RFID tags between state A and state B, controlling when tags are read. In state A, tags can be read; in state B, tags are not read for a predefined period. This periodic reading pattern reduces excessive data generation while maintaining reliable tag detection coverage.
2Quantity of substance
If RFID readers use session 2 or session 3 to reduce reading frequency, then data volume is reduced, but tags may not be tracked beyond their first read
Solution Approach 1:
The patent implements feedback through a state machine that tracks the reading state of each RFID tag. The system reads tags in state A, transitions them to state B after reading, and maintains state B for a predefined period. This feedback mechanism ensures tags are tracked continuously beyond their first read while controlling data volume, resolving the contradiction between data reduction and tracking continuity.
3Device complexity
If department level tracking is implemented instead of specific location tracking, then tracking complexity is reduced, but tracking precision decreases
Solution Approach 1:
The patent applies segmentation by dividing the store into multiple departments, each with its own RFID reader. This allows the system to track merchandise at the department level rather than specific locations, reducing system complexity while maintaining sufficient tracking precision for inventory management purposes.
Data Source
AI summary
An RFID reader configures each of a plurality of antennas operating in the RFID reader to operate in one of a first state and a second state, configures each of the plurality of antennas to operate in a first session and a second session and to operate in opposite states in the first session and the second session, and configures adjacent antennas or adjacent groups of antennas to operate in opposite states in the first session and the second session. During operation, each of the plurality of antennas is configured to read an RFID tag within a range of the antenna when a state of the RFID tag for the session in which the antenna is configured to operate matches the state in which the antenna is configured to operate and to switch the state of the RFID tag to the opposite state for each session.