Adaptive Geo-fence Radius and Sampling for Fast-Moving Devices
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Solution Overview
Problem
Geo-fencing applications on portable electronic devices fail to function properly when the device moves quickly, as the small radius and low frequency of location coordinate sampling result in missed notifications upon entering or leaving a designated geographical area.
Innovation Solution
Adjusting the radius of the geo-fence and/or the frequency of location coordinate sampling based on the device's speed, such as increasing the radius and decreasing the sampling period when the device is moving rapidly, to enhance the likelihood of detecting entry or exit from the geo-fence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the frequency of sampling geographical location coordinates is kept low to reduce power consumption, then power consumption is reduced, but the geo-fencing application cannot work properly when the device moves fast
Solution Approach 1:
The patent applies dynamics by making the sampling frequency adaptive rather than fixed. The system dynamically adjusts the sampling frequency based on the detected movement speed of the device. When movement speed exceeds a threshold, the sampling frequency increases automatically; when speed is low, frequency decreases. This dynamic adjustment resolves the contradiction by ensuring reliable geo-fencing detection during fast movement while maintaining low power consumption during slow movement or stationary states.
Solution Approach 2:
The patent changes the parameter of sampling frequency based on movement speed conditions. By introducing speed as a controlling parameter, the system transitions from a static low-frequency sampling mode to a variable-frequency mode. This parameter change allows the system to optimize between power consumption and detection reliability depending on the operational context, specifically increasing sampling rate only when necessary during high-speed movement.
2Measurement precision
If the radius of the geo-fence is kept small for precision, then location precision is improved, but the device may not detect entry or exit when moving fast through the area
Solution Approach 1:
The patent makes the geo-fence radius dynamic rather than static. The system adjusts the radius based on the device's movement speed: using a smaller radius for precision during slow movement and expanding to a larger radius during fast movement. This dynamic radius adjustment ensures that the detection zone is sufficient to capture entry/exit events even at high speeds, while maintaining precision when the device is moving slowly or stationary.
Solution Approach 2:
The patent changes the radius parameter of the geo-fence based on movement speed conditions. By introducing speed-dependent radius adjustment, the system optimizes the balance between detection precision and detection reliability. The radius parameter is increased only when necessary during high-speed movement to ensure detection, while maintaining a smaller radius during normal conditions to preserve precision and reduce false positives.
Data Source
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AI summary
The specification discloses a notification outputting method and a device and relates to the field of communications technologies, so as to resolve a problem that a geo-fencing application cannot work properly when a portable electronic device moves fast. The method includes: obtaining geographical coordinates a1 and a moving speed v1 of a portable electronic device after a geo-fence is set; adjusting a radius of the geo-fence from r1 to r2 when the geographical coordinates a1 are located outside the geo-fence whose radius is r1 and the moving speed v1 is greater than a preset threshold, where r2 > r1; obtaining geographical coordinates a2 and a moving speed v2 of the portable electronic device; and outputting a notification when the geographical coordinates a2 are located within the geo-fence whose radius is r2.