Indoor Outdoor Detection Using Wireless Signal Reflections
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Solution Overview
Problem
Existing wireless electronic devices face inaccuracies in determining whether they are indoors or outdoors, leading to improper operation and setting usage due to reliance on GPS signals, which can be unreliable, especially when signals pass through windows or are blocked by buildings.
Innovation Solution
The electronic devices transmit ranging signals upward toward a ceiling and analyze reflected signals to determine their location by comparing power amplitudes to a threshold, which is empirically determined for accuracy, and can also use other methods like user input and wireless signal strength to confirm indoor or outdoor status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS signals are used to determine indoor/outdoor status, then location determination is enabled, but measurement precision deteriorates due to signal passing through windows or being blocked by buildings
Solution Approach 1:
The patent introduces an intermediary detection mechanism (wireless signal reflection analysis) between the GPS signal and the indoor/outdoor determination. Instead of directly relying on GPS signal presence, the system uses wireless signal reflections as an intermediate indicator to infer ceiling presence, which then corroborates or corrects the GPS-based location status. This intermediary layer filters out false positives from window transmissions and false negatives from building blockages.
Solution Approach 2:
The system implements feedback by continuously monitoring wireless signal reflections and comparing them against expected patterns for indoor environments. The reflection characteristics provide feedback about the presence of ceilings above the device, which feeds back into the location status determination logic to correct GPS-based assumptions. This closed-loop feedback mechanism dynamically adjusts the indoor/outdoor status based on real-time environmental signal characteristics.
2Measurement precision
If GPS signals are transmitted and received, then location services are provided, but reliability worsens when signals are improperly received due to environmental factors
Solution Approach 1:
The patent substitutes the mechanical/GPS-based signal transmission system with a wireless reflection-based detection system. Instead of relying on external GPS satellite signals that penetrate windows or are blocked by buildings, the system uses local wireless signal transmissions and analyzes their reflections off nearby surfaces (particularly ceilings). This substitution replaces the vulnerable GPS-dependent mechanism with a self-contained reflection analysis mechanism that is insensitive to external signal blockages or transmissions.
3Reliability
If wireless signals are transmitted for indoor/outdoor detection, then determination reliability is improved, but energy consumption increases
Solution Approach 1:
The patent achieves multi-functionality by using the wireless communication transceiver for dual purposes: primary GPS-based location determination and secondary reflection-based indoor/outdoor detection. The same antenna and signal processing circuitry that receive GPS signals are also used to detect reflected wireless signals from ceilings. This universal use of existing components enables the additional detection function without requiring separate dedicated hardware, thereby minimizing the incremental energy cost.
Solution Approach 2:
The system performs self-service by using its own transmitted wireless signals (or ambient wireless signals) as the detection probe. The device transmits signals and analyzes their own reflections, or alternatively uses ambient wireless signals already present in the environment. This self-service approach eliminates the need for external dedicated detection equipment and reduces energy consumption by leveraging existing signal infrastructure and the device's own communication capabilities.
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 method increases the reliability of indoor/outdoor determinations, improving the accuracy of operations such as altitude detection and network switching, ensuring correct calibration and reducing power consumption and connectivity issues.
Implementation Method 1
the electronic device may transmit ranging signals in an upward direction toward a ceiling. Any reflected signals from the upward direction may be analyzed to determine whether the electronic device is indoors or outdoors by comparing the power amplitudes of the reflected signals to a threshold.
Data Source
AI summary
An electronic device may utilize various methods or systems to determine whether the electronic device is indoors or outdoors. The electronic device transmits wireless signals (e.g., radio detection and ranging (RADAR) signals). The electronic device receives reflections of the wireless signals. Using these received reflections of the wireless signals, the electronic device determines whether a power amplitude of the reflections is greater than or equal to a threshold value. In response to a determination that the power amplitude is not greater than or equal to the threshold value, the electronic device operates in an outdoor mode or an indoor mode.