Near-Field Communication Device Power Management via Periodic Wave Generation
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Solution Overview
Problem
Near-field wireless communication systems, particularly in devices like cell phones, face significant power consumption issues due to the continuous generation of electromagnetic waves for power supply to IC cards, reducing operational time and necessitating techniques to reduce power consumption.
Innovation Solution
A communication device and method that includes an electromagnetic-wave generating means and a transmitting/receiving means to output and demodulate electromagnetic waves, with attribute information exchanged to reduce power output after receiving communication ability information, allowing for lower power operation in both active and passive modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reader/writer or initiator continues generating electromagnetic waves for a long period to supply power to IC cards or targets, then power supply to the card is maintained, but power consumption of the reader/writer and initiator is increased
Solution Approach 1:
The electromagnetic wave generation is performed periodically rather than continuously. The reader/writer generates electromagnetic waves in intervals, switching between active generation and standby states, which reduces overall power consumption while still maintaining the ability to supply power when needed.
Solution Approach 2:
The system dynamically adjusts the electromagnetic wave generation based on communication needs. The reader/writer transitions between different operational states (active electromagnetic wave generation, standby, and power-saving modes) depending on whether data transmission is required, optimizing power usage while maintaining reliability.
2Reliability
If the cell phone performs output of electromagnetic wave continuously, then communication function is maintained, but operable time is reduced to less than 1/10 of normal stand-by state
Solution Approach 1:
The cell phone performs electromagnetic wave output periodically rather than continuously. It switches between active communication mode and power-saving standby mode, generating electromagnetic waves only when data transmission is required. This periodic operation extends operable time from less than 1/10 of standby time to much closer to full standby duration.
Solution Approach 2:
The system automatically manages its own power consumption by detecting communication needs and adjusting electromagnetic wave generation accordingly. The cell phone monitors communication requirements and autonomously transitions between high-power and low-power states without user intervention, maximizing operable time.
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 by optimizing electromagnetic wave output based on communication ability information, thereby extending operational time and improving energy efficiency in near-field wireless communication systems.
Implementation Method 1
an electromagnetic-wave generating means for outputting an electromagnetic wave
Implementation Method 2
transmitting data by modulating the electromagnetic wave in accordance with data
Implementation Method 3
receiving data transmitted from the other device by demodulating the electromagnetic wave
Implementation Method 4
An IC card of ISO/IEC 14443 (PICC), an IC card of ISO/IEC 15693 (VICC) and the target of ISO/IEC 18092 receives power supply by electromagnetic induction when coming close to the reader/writer or the initiator
Data Source
AI summary
A communication device includes: an electromagnetic-wave generating unit for outputting an electromagnetic wave; and a transmitting/receiving unit for transmitting data by modulating the electromagnetic wave in accordance with data and receiving data transmitted from the other device by demodulating the electromagnetic wave outputted by the electromagnetic-wave generating unit or the electromagnetic wave outputted by the other device as the other party of communication, wherein the transmitting/receiving unit transmits attribute information indicating communication ability of the device and receives attribute information indicating communication ability of the other device, and the electromagnetic-wave generating unit reduces power of the electromagnetic wave to be outputted after receiving the attribute information.