RFID Tag Autoconnect Discovery via Shared Node Voltage Sensing
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Solution Overview
Problem
RFID tags face challenges in detecting connection and disconnection events, especially when one tag is unpowered, due to their limited power budget, which complicates real-time sensing and automation in data center operations.
Innovation Solution
Implementing a method where an RFID tag periodically places a charge on a shared node and senses the voltage subsequently, allowing it to automatically determine the connection status with another RFID tag, including conditions of being disconnected, connected but unpowered, or connected and powered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RFID tags use traditional reader-interrogation methods to detect connection status, then connection information can be obtained, but the system requires significant numbers of unique queries and commands, increasing communication overhead and time
Solution Approach 1:
The RFID tags autonomously detect connection status by monitoring voltage changes on shared nodes without requiring reader interrogation. Each tag independently places charges on shared nodes and senses voltage subsequent to the charging, enabling self-service connection discovery that eliminates communication overhead and reduces discovery time
2Reliability
If passive RFID tags continuously monitor connection status, then real-time detection is achieved, but the limited power budget is exceeded
Solution Approach 1:
The RFID tags perform connection status detection periodically rather than continuously. The tag places a charge on the shared node at periodic intervals and senses the voltage subsequent to each charging event, achieving real-time monitoring capability while consuming minimal power by remaining in low-power states between periodic measurements
Solution Approach 2:
The detection mechanism uses the tags' own electrical characteristics and shared nodes to perform self-diagnosis of connection status, eliminating the need for external power-intensive monitoring systems or continuous reader interrogation, thereby preserving the limited power budget
3Measurement precision
If RFID tags detect connection when both tags are powered, then connection status can be determined, but detection fails when one tag is unpowered
Solution Approach 1:
The powered RFID tag independently performs connection detection by placing charges on shared nodes and sensing voltage changes, without requiring the other tag to be powered or actively participate. This self-service mechanism enables the powered tag to detect connections to unpowered tags, achieving universal detection capability across all power states
Solution Approach 2:
The detection method monitors voltage parameters on shared nodes that change based on connection status regardless of the power state of connected tags. By detecting voltage changes caused by the powered tag's own charge placement on shared nodes, the system adapts to various power conditions and maintains detection accuracy
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
Enables low-power, instantaneous detection of connection and disconnection events between RFID tags, facilitating real-time monitoring and automation of data center network management, including reconfiguration tracking and error alarms.
Implementation Method 1
A circuit on a first radio-frequency identification (RFID) tag detects a connection status between the first RFID tag and a second RFID tag, by periodically placing a charge on a node shared between the first RFID tag and the second RFID tag, and sensing a voltage at the node at a time subsequent to the placing of the charge
Data Source
AI summary
Methods, circuits, and systems are disclosed for automatically detecting connections between RFID tags. In one embodiment, a method is provided that includes periodically placing a charge on a node shared between a first RFID tag and a second RFID tag. The method also comprises sensing a voltage at the node at a time subsequent to the placing of the charge. The method also comprises automatically determining whether a connection exists between the first RFID tag and the second RFID tag based on the sensing of the voltage at the node. The first RFID tag and/or the second RFID tag may include circuitry configured to perform the method.