Optical Wireless Terminal Authentication Correction Circuit
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Solution Overview
Problem
Hybrid communication systems face challenges in maintaining stable authentication due to varying reception characteristics based on distance and angle between the VLC light source and the optical detector, leading to frequent authentication errors, especially with terminal mobility.
Innovation Solution
A communication system that employs sensors in the terminal to correct optical wireless signals based on sensed state, including acceleration, gyro, and proximity data, to improve authentication reliability by adjusting signal intensity and illuminance thresholds, allowing for successful authentication regardless of terminal mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If optical wireless communication is used for authentication, then high-speed data transmission is achieved, but reception characteristics vary significantly with distance and angle causing authentication errors
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the illuminance threshold based on reception characteristics. The authentication determination unit changes the threshold parameter according to the received optical signal strength, allowing reliable authentication even when reception conditions vary due to distance or angle changes. This resolves the contradiction by making the system adaptable to different reception conditions while maintaining high-speed optical communication.
2Ease of operation
If the terminal is made mobile, then ease of operation is improved, but authentication errors increase due to varying reception characteristics
Solution Approach 1:
The patent implements dynamics by making the authentication system adaptive to terminal movement. The authentication determination unit dynamically adjusts the illuminance threshold based on real-time reception characteristics, allowing the system to maintain reliability even when the terminal moves and reception conditions change. This enables mobile operation without sacrificing authentication success rate.
3Reliability
If strict authentication thresholds are used, then security is improved, but authentication failures increase under varying reception conditions
Solution Approach 1:
The patent resolves this contradiction by dynamically changing the illuminance threshold parameter based on reception conditions. When reception characteristics are good, a stricter threshold maintains security. When reception characteristics deteriorate due to distance or angle, the threshold is adjusted to prevent unnecessary authentication failures. This maintains both security and adaptability to varying reception conditions.
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
The system enhances the probability of successful authentication by dynamically correcting electrical signals using sensor data, ensuring stable communication even when the terminal's position or orientation affects light reception, thus maintaining connectivity across different states.
Implementation Method 1
an optical receiver that receives an optical modulation signal being transmitted from the base station via the optical wireless communication and containing authentication information for permitting communication via the RF wireless communication and that outputs an electrical signal
Data Source
AI summary
An objective is to provide a communication system, a terminal, a communication method, and a program capable of improving the probability of successful authentication regardless of mobility of the terminal.The communication system according to the present invention includes a terminal 30 including: a sensor unit 36 that senses a state of the terminal and includes at least one of an acceleration sensor, a gyro sensor, a position sensor, and a proximity sensor; an optical receiver 31 that receives an optical modulation signal and outputs an electrical signal; a correction circuit 34 that corrects the electrical signal on a basis of the state of the terminal sensed by the sensor unit 36 when one of the following is true: illuminance of light received from an optical transmitter 21 by the optical receiver 31 is equal to or lower than an illuminance threshold value; and a signal intensity of the electrical signal output by the optical receiver 31 is equal to or lower than an intensity threshold value; an authentication information checking circuit 32 that checks the authentication information contained in the electrical signal; and a terminal-side RF transmitter/receiver 33 that transmits the authentication information to a base station 20 via RF wireless communication.