RFID Tag Positioning Using Inter-Packet Arrival Time
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the distance between RFID stations and tags without imposing significant hardware and processing demands on the RFID tag, leading to excessive power consumption and latency.
Innovation Solution
The method involves an RFID tag harvesting energy from radio frequency waves after transmitting a first packet and transmitting a second packet when the energy storage device reaches a configured level, allowing the RFID station to estimate the distance based on the inter-packet arrival time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RFID tags use traditional positioning methods, then positioning accuracy can be achieved, but hardware complexity and processing requirements increase significantly
Solution Approach 1:
The RFID tag autonomously harvests energy from the RFID station's electromagnetic signals to power its operations, eliminating the need for an external power source or complex power management hardware. The tag uses this self-harvested energy to transmit packets for positioning, significantly reducing hardware complexity while maintaining positioning functionality
Solution Approach 2:
The patent extracts the power source function from the traditional RFID tag design by using energy harvesting from the station's signals. This removes the need for batteries or power supply circuits, simplifying the tag's hardware architecture while enabling continuous operation for positioning purposes
2Measurement precision
If RFID tags transmit packets frequently for positioning, then positioning accuracy improves, but power consumption increases
Solution Approach 1:
The RFID tag transmits packets periodically rather than continuously, using energy harvesting to power intermittent transmissions. The tag waits for sufficient energy accumulation between transmissions, creating a periodic transmission pattern that balances positioning accuracy requirements with power consumption constraints
Solution Approach 2:
The system dynamically adjusts transmission parameters based on energy availability. The tag modifies transmission timing and frequency according to the energy harvesting rate and power consumption needs, optimizing the balance between achieving sufficient positioning accuracy and minimizing overall power consumption
3Measurement precision
If RFID tags process signals locally, then positioning can be determined, but processing complexity and latency increase
Solution Approach 1:
Instead of the RFID tag processing signals locally to determine positioning, the system inverts the approach by having the RFID station receive packets and perform positioning calculations. This inversion transfers the processing complexity from the tag to the station, significantly reducing the tag's processing requirements and latency
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 simplifies hardware and processing complexity at the RFID tag, enabling accurate distance determination without excessive power consumption or latency, thus optimizing positioning estimation.
Implementation Method 1
harvesting energy at least based on radio frequency waves from the RFID station after the first packet being transmitted
Data Source
AI summary
Disclosed are techniques for wireless communication. In an aspect, a radio frequency identification (RFID) station may receive a first packet from an RFID tag at a first arrival time. The RFID station may receive a second packet from the RFID tag at a second arrival time after the first arrival time. The RFID station may estimate a distance between the RFID station and the RFID tag based on an inter-packet arrival time between the first packet and the second packet, the inter-packet arrival time being based on a time difference between the first arrival time and the second arrival time.