Radio Tag Reader Frequency Band Selection
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Solution Overview
Problem
Radio tag reading apparatuses using RFID technology face inefficiencies in reading information from multiple tags due to the time required for data collection, especially when the number of tags is large, and interference issues with other devices.
Innovation Solution
The apparatus employs an antenna device, storage device, and controller to dynamically select usable frequency bands and adjust transmission rates based on available channels, using the Shannon-Hartley theorem to optimize communication speed by switching between high, medium, and low transmission rates depending on channel availability and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the radio tag reading apparatus reads information from multiple radio tags sequentially using a single frequency band, then the reading process is simple and interference is minimized, but the total reading time increases significantly
Solution Approach 1:
The patent divides the radio frequency spectrum into multiple frequency bands and assigns different bands to different radio tag reading apparatuses. This segmentation allows parallel reading operations across multiple frequency bands simultaneously, dramatically reducing total reading time while maintaining controlled interference through frequency separation.
Solution Approach 2:
The patent transitions from single-frequency sequential reading to multi-frequency parallel reading by adding the frequency dimension to the reading process. Multiple apparatuses operate simultaneously on different frequency bands, converting a one-dimensional sequential process into a multi-dimensional parallel process that reduces time loss.
2Reliability
If the radio tag reading apparatus uses carrier sense to avoid interference by selecting unused channels, then interference is reduced, but the complexity of the control system increases
Solution Approach 1:
The patent implements preliminary frequency band assignment where each radio tag reading apparatus is pre-assigned to specific frequency bands before operation begins. This preliminary action eliminates the need for complex real-time carrier sense and dynamic channel selection, reducing control system complexity while maintaining reliable interference avoidance through predetermined frequency separation.
3Productivity
If the radio tag reading apparatus increases transmission power to read tags faster, then reading speed improves, but interference with other apparatuses increases
Solution Approach 1:
The patent applies different transmission powers to different frequency bands based on local interference conditions and reading requirements. Each frequency band can be optimized with appropriate transmission power levels, allowing high-speed reading where possible while minimizing interference in congested bands, thus balancing productivity and interference reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces the time needed to read information from multiple tags by utilizing high-speed transmission when channels are available and adapting to interference conditions, effectively managing large-scale data collection while minimizing interference.
Implementation Method 1
The antenna device radiates a radio wave toward a radio tag and receives a response radio wave from the radio tag
Data Source
AI summary
In one embodiment, a radio tag reading apparatus has an antenna device, a storage device, and a controller. The controller judges what frequency band is usable or not out of a plurality of frequency bands stored in the storage device. Further the controller makes the antenna device radiate a radio wave in the judged usable frequency band at a transmission rate in accordance with a width of the judged usable frequency band.