Dynamic RFID Tag Interrogation for Range and Cost Trade-offs
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Solution Overview
Problem
Current RFID systems face limitations in range and reliability, particularly in passive UHF systems, and are costly due to the need for active systems with battery-powered semi-passive systems offering intermediate performance but still facing interference and battery life issues.
Innovation Solution
The development of a dynamic selection and query system for RFID tags based on specific characteristics, allowing for both inclusive and exclusive querying to efficiently activate and interrogate relevant tags, reducing interference and processing demands, and enhancing performance by using battery-assisted and active modes as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If passive UHF RFID systems are used, then cost is reduced, but range and reliability are limited
Solution Approach 1:
The system dynamically adjusts the interrogation mode (inclusive or exclusive) based on the current operational requirements and tag population characteristics. This dynamic adaptation allows the system to optimize between range/reliability and cost by selecting the appropriate querying strategy for each scenario, rather than being fixed to one mode.
Solution Approach 2:
The patent changes the parameter of query mode (inclusive vs. exclusive) to resolve the contradiction. By switching between these modes, the system can adjust the balance between reading all tags (inclusive) for maximum reliability and only reading relevant tags (exclusive) for reduced interference and improved range performance.
2Reliability
If active RFID systems are used, then range is extended, but cost increases significantly
Solution Approach 1:
The system segments the RFID tag population into different subsets based on their characteristics and applies different interrogation strategies to each segment. This allows the system to treat different tag groups differently, optimizing the balance between range and cost by not uniformly applying expensive active system characteristics to all tags.
Solution Approach 2:
Instead of requiring all tags to have full active capabilities, the system applies partial active characteristics only where needed. By using inclusive querying for certain scenarios and exclusive querying for others, the system achieves extended range when necessary while maintaining cost-effectiveness for general operations.
3Reliability
If all RFID tags are queried in each round, then complete inventory is achieved, but interference and processing demands increase
Solution Approach 1:
The system extracts and removes irrelevant tags from the interrogation process by using exclusive querying modes that target only specific tag subsets. This extraction of unnecessary tags reduces interference in the communication channel while maintaining inventory completeness for the relevant tag population.
Solution Approach 2:
The interrogation mode is dynamically adjusted based on the current situation. When the environment is calm and complete inventory is critical, inclusive querying is used. When interference is high or processing resources are constrained, the system switches to exclusive querying to reduce harmful factors while maintaining necessary inventory accuracy.
4Quantity of substance
If inclusive querying is used, then all tags are read, but processing time and interference increase
Solution Approach 1:
The system dynamically switches between inclusive and exclusive querying modes based on real-time conditions. When time is critical or interference is high, it transitions to exclusive querying to reduce processing time. When complete inventory is required and time is abundant, it uses inclusive querying to read all tags.
Solution Approach 2:
The system employs periodic evaluation of interrogation conditions and switches between querying modes accordingly. This periodic adaptation allows the system to optimize processing time by selecting the appropriate mode for each operational period rather than sticking to a single fixed mode.
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 enables more reliable inventorying of relevant tags, reduces interference, and optimizes battery life by selectively activating and querying tags with specific features, improving range and performance while minimizing costs.
Implementation Method 1
Passive LF, HF, and UHF RFID systems comprise tags that operate without batteries and effectively leverage power that is wirelessly received from an RFID reader to communicate information back to the reader
Implementation Method 2
These systems utilize the UHF band and extend upon passive tags by providing tag operating power from a compact battery such as a coin cell, thus enhancing range
Implementation Method 3
The tag maintains the use of a simple and low power 'backscatter' transmitter that operates by modulating a reflection of a reader provided RF signal back to the reader
Data Source
AI summary
Embodiments of the present invention allow for dynamic selection and query of different types of RFID tags into a session. Embodiments of the present invention also allow for dynamic activation of different types of RFID tags. In certain embodiments of the invention, an inclusive operation is performed on the RFID tags and in other embodiments an exclusive operation is performed.