Mobile Device Motion Sensor Sampling Speed Control
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Solution Overview
Problem
Existing mobile devices with acceleration sensors face increased current consumption and shortened battery life due to constant high-speed sampling, which is not optimized for varying application requirements, and are vulnerable to relay attacks when not in use.
Innovation Solution
The mobile device dynamically adjusts the sampling speed of its motion sensor based on proximity to an apparatus and enables/disables the polling signal receiving function accordingly, reducing current consumption and enhancing authentication security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sampling speed of the motion sensor is set to high speed constantly, then the detection accuracy of mobile device movement is improved, but the current consumption increases and battery life shortens
Solution Approach 1:
The patent applies dynamics by making the sampling speed adjustable rather than fixed. The control unit dynamically changes the sampling speed of the motion sensor based on whether the mobile device is in proximity to the apparatus. When in proximity, high sampling speed is used for accurate detection; when not in proximity, low sampling speed is used to conserve battery power. This resolves the contradiction between detection accuracy and current consumption by adapting the sampling speed to actual operational needs.
2Reliability
If the polling signal receiving function is constantly enabled, then the response to mobile device approach is improved, but the current consumption increases
Solution Approach 1:
The patent applies periodic action by enabling the polling signal receiving function only at specific intervals rather than continuously. The control unit periodically checks whether the mobile device is in proximity to the apparatus and enables the receiving function only when needed. This periodic enabling/disabling approach maintains reliable response capability when the device is near while significantly reducing current consumption when the device is away, thus resolving the contradiction between reliability and energy usage.
3Use of energy by moving object
If the sampling speed is reduced to low speed when not near the apparatus, then the current consumption is reduced, but the detection accuracy of movement decreases
Solution Approach 1:
The patent applies local quality by applying different sampling speeds in different spatial contexts. High sampling speed is applied locally when the mobile device is in proximity to the apparatus where accurate movement detection is critical for security authentication. Low sampling speed is applied locally when the device is not in proximity where authentication is not required. This spatially differentiated approach maintains detection accuracy where needed while reducing current consumption elsewhere.
Data Source
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AI summary
A mobile device (3) possessed by a user is equipped with: a motion sensor (34) which is capable of detecting the motion of the mobile device; a receiver (32) which is capable of receiving a polling signal transmitted from equipment (2); and a control unit (31) which is configured so as to set, in response to whether or not the polling signal has been received by the receiver (32), the sampling speed with which the motion sensor (34) detects the motion of the mobile device.