Path-Loss Offset Calculation for Wireless Proximity Estimation
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Solution Overview
Problem
Existing wireless device communication systems face inaccuracies in estimating proximity due to environmental factors affecting signal strength, leading to false alerts when determining distance between devices.
Innovation Solution
The implementation of a path-loss offset calculation using sensor data to compensate for environmental conditions, such as indoor or outdoor locations, allowing for more accurate proximity estimation and reduced false alerts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distance estimation is based on received signal strength, then proximity detection is enabled, but measurement precision deteriorates due to environmental factors affecting signal strength
Solution Approach 1:
The patent introduces path-loss offset as an intermediary parameter that mediates between the received signal strength and the actual distance estimation. This offset compensates for environmental factors (walls, buildings, terrain) that affect signal propagation, thereby improving measurement precision without requiring direct measurement of environmental conditions
Solution Approach 2:
The patent changes the estimation parameter from raw received signal strength to path-loss compensated signal strength. By applying path-loss offset based on environmental characteristics (indoor/outdoor, urban/rural), the system adapts the measurement parameter to account for environmental variations, thereby maintaining accurate distance estimation across different conditions
2Reliability
If proximity alerts are triggered based on received signal strength, then user notification is enabled, but reliability deteriorates due to false alerts caused by environmental factors
Solution Approach 1:
The patent implements a feedback mechanism where path-loss offset is calculated based on environmental conditions and fed back into the distance estimation process. This feedback loop allows the system to continuously adjust distance estimates according to current environmental conditions, reducing false alerts while maintaining reliable proximity notifications
Solution Approach 2:
The path-loss offset acts as an intermediary that filters out environmental noise from the proximity detection process. By compensating for signal strength variations caused by environmental factors before triggering alerts, the system improves reliability and reduces false notifications
Data Source
AI summary
A method on an electronic device for a wireless network is described. A wireless signal is received from a second electronic device. A receive power level indication for the received wireless signal is determined. A path-loss offset for the received wireless signal is determined based on sensor data that indicates a path-loss condition. A path-loss for the received wireless signal is estimated based on the receive power level indication and the path-loss offset. A function is performed based on the path-loss and the path-loss threshold.