Vehicle Terminal Position Control for Low-Power UWB Authentication
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Solution Overview
Problem
Existing techniques for measuring the position of a mobile terminal with respect to a mobile body, such as a vehicle, result in increased power consumption and reduced convenience due to prolonged communication intervals or suspension of position measurement, leading to suboptimal user experience.
Innovation Solution
A mobile body control device employing a first and second communication unit with different power consumption specifications, intermittently switching between operating and suspended states at varying periods to measure the mobile terminal's position, adjusting periods based on proximity and communication intensity, and utilizing lower power consumption communication when the terminal is farther away.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position measurement through UWB communication is continuously performed, then position detection accuracy is improved, but power consumption increases
Solution Approach 1:
The system performs position measurement through UWB communication at periodic intervals rather than continuously. The measurement interval is dynamically adjusted based on the mobile terminal's proximity to the vehicle - shorter intervals when near (improving responsiveness) and longer intervals when far (reducing power consumption). This periodic measurement approach resolves the contradiction between maintaining position detection accuracy and minimizing power consumption.
2Use of energy by moving object
If measurement intervals are expanded or measurement is ended to suppress power consumption, then power consumption is reduced, but authentication response time increases
Solution Approach 1:
The system dynamically adjusts the position measurement interval based on the mobile terminal's distance from the vehicle. When the terminal is within a predetermined distance (indicating the user is approaching or at the vehicle), the system shortens the measurement interval or performs continuous measurement, ensuring prompt authentication. When the terminal is farther away, the system expands the measurement interval to reduce power consumption. This dynamic adjustment resolves the contradiction between power consumption and authentication response time.
3Ease of operation
If UWB communication is performed frequently to improve authentication speed, then authentication convenience is improved, but power consumption increases
Solution Approach 1:
The system applies different communication strategies based on the local condition of the mobile terminal's proximity to the vehicle. In the local region where the terminal is within predetermined distance (user needs authentication), the system performs frequent UWB communication to ensure fast authentication response. In other regions where the terminal is farther away (user does not need immediate authentication), the system reduces communication frequency to save power. This localized approach resolves the contradiction between authentication convenience and power consumption.
Data Source
AI summary
A mobile body control device that includes a mobile terminal position measurement unit configured to: communication between a first communication unit and a mobile terminal is intermittently performed, to start mobile terminal position measurement processing for measuring the position of the mobile terminal based on a communication state between the first communication unit and the mobile terminal; and, when the position of the mobile terminal measured by the mobile terminal position measurement processing does not reach a second prescribed distance or less from a mobile body within a prescribed time from a point of start of the mobile terminal position measurement processing, the switching period is changed to a second measurement period that is longer than the first measurement period and the mobile terminal position measurement processing is continued.