RF Tag Presence Inquiry and Dormant State Logic
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Solution Overview
Problem
Conventional asset tracking systems face issues with unnecessary power consumption and interference due to regular broadcasts, which can drain the batteries of semi-passive and active wireless tags and make it difficult to accurately identify assets within a given area, especially during transportation or when unauthorized individuals attempt to detect radio transmissions.
Innovation Solution
A radio frequency communication device that operates in two states: responding to initial presence inquiries and then entering a dormant state unless triggered by sensor-acquired information, such as movement or location changes, thereby reducing unnecessary transmissions and conserving power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If regular broadcasts are made to track assets, then asset visibility is improved, but power consumption increases and interference occurs
Solution Approach 1:
The system uses periodic presence inquiries broadcast at specific intervals instead of continuous monitoring. The inquiry message is transmitted periodically to solicit presence responses from wireless tags, reducing power consumption while maintaining asset visibility. This periodic action allows the system to balance between tracking reliability and energy conservation.
2Measurement precision
If wireless tags respond to all broadcasts, then detection accuracy is improved, but interference and power drain increase
Solution Approach 1:
The system implements class-based filtering where wireless tags only respond to presence inquiries that match their specific class designation. Each tag is configured with a unique class identifier and only processes inquiries containing matching class information. This selective response mechanism maintains detection accuracy for relevant assets while reducing interference from unrelated broadcasts and conserving tag power.
3Measurement precision
If presence inquiries are made frequently, then asset tracking accuracy is improved, but battery life decreases
Solution Approach 1:
The system employs periodic presence inquiries transmitted at optimized intervals rather than continuous or frequent requests. This periodic approach maintains sufficient tracking accuracy by regularly updating asset locations while allowing wireless tags to remain in low-power states between inquiries, thereby extending battery life.
4Measurement precision
If wireless tags transmit continuously, then location accuracy is improved, but power consumption increases
Solution Approach 1:
The system uses presence response messages that are transmitted only when needed, specifically in response to presence inquiries. The response includes location information and is sent preliminarily before further tracking operations require this data. This on-demand transmission approach maintains location accuracy while minimizing power consumption by avoiding continuous transmission.
Data Source
AI summary
A RF data communication device operates in at least two states. In a first state, the device transmits a response to an RF transmission if specific data therein represents an inquiry as to the presence of one or more RF data communication devices and if specific data therein corresponds to a class maintained by the device. The device does not transmit a response if specific data in the RF transmission is not representative of an inquiry as to the presence of one or more RF data communication devices, or if specific data therein does not correspond to at least one maintained class. In a second state, the device does not transmit a response when specific data is included therein that is representative of an inquiry as to the presence of one or more RF data communication devices and specific data therein corresponds to at least one maintained class.