Passive RFID Tag Adaptive Packet Size for Data Transmission
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Solution Overview
Problem
Passive RFID tags face limitations in transmitting large-capacity data due to power management constraints, resulting in restricted communication distances and data transmission capabilities compared to active RFID tags, while active RFID tags require periodic management and have installation difficulties.
Innovation Solution
A passive wireless memory device that includes a memory unit and a passive RFID tag capable of converting data into data packets in response to request signals from a reader, with adaptive packet size adjustment based on channel state predicting flags and packet size adjustment flags to optimize data transmission, using the reader's radio signal as a power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If passive RFID tags use power induced by RFID readers, then ease of management and installation is improved, but communication distance and data transmission capacity are reduced
Solution Approach 1:
The patent implements dynamic packet size adjustment based on channel conditions. The passive RFID tag monitors signal quality metrics (RSSI, SNR, BER) and adapts the data packet size accordingly - using larger packets when channel conditions are good and smaller packets when conditions deteriorate. This dynamic adaptation resolves the contradiction by optimizing data transmission capacity while maintaining the passive power-induction architecture that ensures ease of management and installation.
Solution Approach 2:
The patent changes the parameter of packet size based on channel state. By adjusting the packet size parameter dynamically according to measured signal quality, the system maximizes data transmission efficiency within the power constraints of passive RFID tags, thereby improving communication distance and data capacity without requiring active power sources.
2Device complexity
If passive RFID tags use fixed packet size, then device complexity is reduced, but data transmission efficiency and adaptability to channel conditions are reduced
Solution Approach 1:
The patent implements a feedback mechanism where the passive RFID tag continuously monitors channel quality parameters (RSSI, SNR, BER) and uses this feedback to adjust packet size. The system measures signal quality, compares it against thresholds, and adapts transmission parameters accordingly. This feedback loop enables efficient data transmission without requiring complex manual configuration or external control systems.
Solution Approach 2:
The passive RFID tag performs self-adjustment of packet size based on its own measurements of channel conditions. The tag autonomously monitors signal quality metrics and modifies its transmission strategy without external intervention, thereby maintaining low device complexity while improving data transmission efficiency through adaptive behavior.
3Quantity of substance
If passive RFID tags transmit large-capacity data, then data transmission capability is improved, but power management constraints and communication distance are worsened
Solution Approach 1:
The patent applies partial action by transmitting data in variable-sized packets rather than always using maximum capacity. Based on channel conditions, the system transmits appropriate portions of data in each packet - using larger packets when power headroom and channel quality permit, and smaller packets when constraints are tighter. This approach enables large-capacity data transmission overall while respecting instantaneous power management constraints of the passive RFID tag.
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 efficient transmission of large-capacity data over longer distances with reduced management and installation burdens, improving data transmission rates and adaptability to varying channel conditions without the need for a separate power source.
Implementation Method 1
Passive RFID tags are supplied with operating power from radio waves of RFID readers
Data Source
AI summary
A passive wireless memory device includes a memory unit and a passive tag. The passive tag converts data stored in the memory unit into a data packet in response to first to third data request signals from a reader and transmits the data packet to the reader. The passive tag determines the size of the data packet in response to the channel state predicting flag and the second and third data request signals.