RFID Communication Apparatus Dynamic Modulation Power Control
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Solution Overview
Problem
Conventional RFID systems face challenges in reducing power consumption without compromising reading speed and communication range, particularly in polling operations where continuous electromagnetic field emission shortens terminal operation time and reduces usability.
Innovation Solution
A communication apparatus using ASK modulation with a control section that sets a high modulation degree for polling and a low modulation degree when response information is received from the RFID tag, reducing power consumption without affecting reading speed or communication range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If continuous polling is performed to maintain fast RFID tag detection speed, then reading speed is improved, but electric power consumption increases
Solution Approach 1:
The patent applies dynamics by making the polling interval variable rather than fixed. The control section dynamically adjusts the polling interval based on whether response information is received from the RFID tag. When a tag is detected, the interval is extended to reduce power consumption; when no tag is detected, the interval returns to normal to maintain detection speed. This dynamic adjustment resolves the contradiction between maintaining fast detection and reducing power consumption.
Solution Approach 2:
The patent uses periodic polling action with variable periods. Instead of continuous polling, the system performs periodic polling with intervals that are dynamically adjusted. The polling is suspended or extended when response information is received, and resumed with normal intervals when no response is detected. This periodic action with variable timing resolves the contradiction by reducing power consumption during successful detection while maintaining detection capability during search phases.
2Use of energy by moving object
If transmission output level is reduced to decrease electric power consumption, then power consumption is improved, but communication range becomes small
Solution Approach 1:
The patent applies dynamics by dynamically adjusting the polling interval based on detection status. When an RFID tag is successfully detected (response information received), the system extends the polling interval to reduce power consumption. When no tag is detected, the system maintains shorter intervals to ensure detection capability. This dynamic timing adjustment allows the system to operate at lower power levels during successful communication while maintaining detection range during search operations.
3Use of energy by moving object
If polling interval is extended to reduce electric power consumption, then power consumption is improved, but detection operation becomes slow
Solution Approach 1:
The patent applies dynamics by making the polling interval variable rather than fixed. The control section dynamically adjusts the polling interval based on whether response information is received from the RFID tag. When a tag is detected, the interval is extended to reduce power consumption; when no tag is detected, the interval returns to normal to maintain detection speed. This dynamic adjustment resolves the contradiction between maintaining fast detection and reducing power consumption.
Solution Approach 2:
The patent uses feedback from the RFID tag's response information to control the polling interval. When response information is received, the system feeds back that detection is successful and extends the interval. When no response is received, the system feeds back that detection is ongoing and maintains shorter intervals. This feedback mechanism ensures detection speed is maintained during search while enabling power savings during successful communication.
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 effectively reduces power consumption while maintaining reading speed and communication range, optimizing the usability of portable terminals by dynamically adjusting the modulation degree during polling and response phases.
Implementation Method 1
a communication section for performing communication in an ASK modulation format with an RFID tag
Implementation Method 2
when an electromagnetic wave or radio wave is received from the RFID reader/writer, an electric current occurs and is rectified to be used as electric power to drive the RFID tag itself
Data Source
AI summary
Disclosed is a communication apparatus comprising: a communication section which performs communication in an ASK modulation format with an RFID tag; and a control section which sets a modulation degree of the ASK modulation of the communication section to a large degree when polling of the RFID tag is performed by the communication section and which sets the modulation degree to a small degree when response information is received from the RFID tag through the communication section.