RF Tag Time-Slot Transmission for Signal Interference
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Solution Overview
Problem
Conventional wireless radio frequency tags experience interference when multiple tags transmit signals simultaneously to a single reader, leading to failed communication due to signal overlap and partial reception of signals.
Innovation Solution
A radio frequency transmission method and device where multiple radio frequency tags respond at different time points based on the logic levels of bits in a voltage waveform, with each tag comparing the received command to prestored commands and transmitting response signals at preset time points with a threshold time difference, preventing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple radio frequency tags transmit signals simultaneously to one reader, then the quantity of transmitted signals increases, but signal interference occurs and communication reliability deteriorates
Solution Approach 1:
The patent implements periodic action by assigning different time slots to different radio frequency tags for signal transmission. Each tag transmits its signal at a predetermined, distinct time point rather than simultaneously, which eliminates signal interference while maintaining the ability to read multiple tags. The reader is configured to receive signals at these specific time points, ensuring reliable communication.
2Productivity
If multiple radio frequency tags transmit signals at the same time, then the productivity of signal transmission increases, but signal interference causes communication failure
Solution Approach 1:
The patent applies segmentation by dividing the signal transmission process into distinct time segments or slots. Each radio frequency tag is assigned a specific time slot for transmission, which segments the overall transmission process. This segmentation prevents simultaneous transmissions from interfering with each other, thereby maintaining both high productivity and reliable communication.
3Quantity of substance
If the reader receives multiple signals at once, then the quantity of received information increases, but signal overlap causes loss of information
Solution Approach 1:
The patent uses periodic action to schedule signal receptions at distinct time points. The reader is configured to receive signals from different tags at predetermined time slots, which prevents signal overlap. This time-division approach allows the reader to accumulate information from multiple tags without losing any data, as each signal is received clearly in its designated time window.
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 successful radio frequency communication by ensuring that response signals from multiple tags do not interfere with each other, allowing the reader to receive distinct signals from each tag, thereby improving communication efficiency.
Implementation Method 1
Radio Frequency Identification (RFID) is a wireless communication technique. Signals can be modulated into electromagnetic field of radio frequency
Implementation Method 2
The integrated circuit inside the passive wireless radio frequency tag can be driven by electromagnetic waves transmitted by a radio frequency reader
Data Source
AI summary
A radio frequency transmission method and a device thereof are provided. The method includes: transmitting a radio frequency command by a radio frequency reader; receiving the radio frequency command by a radio frequency tag, wherein the radio frequency command includes bits; determining a logic level of each of the bits based upon a time length of each of the bits at a voltage level of a voltage waveform by the radio frequency tag; and determining whether to transmit a response signal in response to the radio frequency reader based upon the logic level of each of the bits by the radio frequency tag.