Opening State Detection with Dynamic RF Power Thresholds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless detection devices for openings in buildings face challenges in optimizing transmission power to ensure good radio signal quality while conserving energy and adhering to regulatory limits, particularly when materials like metal degrade signal propagation.
Innovation Solution
The method involves identifying the position of the moving part of an opening to characterize the antenna's environment, adjusting transmission power based on reflective properties and material characteristics, and setting minimum and maximum threshold values to optimize energy consumption and compliance with regulatory limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transmission power is increased to improve radio message quality through poor transmission materials, then transmission quality is improved, but energy consumption increases and battery life decreases
Solution Approach 1:
The transmission power is made dynamic rather than fixed. The system automatically adjusts the transmission power level based on the detected position of the mobile part (open or closed), selecting higher power when the opening is closed (poor transmission conditions) and lower power when open (good transmission conditions), thereby optimizing the balance between transmission quality and energy consumption
Solution Approach 2:
The transmission power parameter is changed according to the environmental conditions. The system determines different power thresholds corresponding to different positions of the mobile part, changing the transmission power parameter to adapt to the varying transmission characteristics caused by the opening/closing state
2Reliability
If transmission power is increased to ensure messages reach destination through poor transmission materials, then transmission reliability is improved, but regulatory power limits are exceeded
Solution Approach 1:
The system dynamically adjusts transmission power within regulatory limits by detecting the position of the mobile part. When the opening is closed and transmission conditions are poor, it uses the maximum allowed power threshold; when open and conditions are good, it uses lower power thresholds, ensuring compliance with regulatory limits while maintaining transmission reliability
Solution Approach 2:
Different power threshold parameters are determined and applied based on the position of the mobile part. The system establishes multiple power threshold levels that are all within regulatory limits, selecting the appropriate threshold based on whether the opening is open or closed, thus adapting to transmission conditions while complying with regulations
3Ease of operation
If fixed transmission power is used to simplify device operation, then device complexity is reduced, but transmission quality varies poorly with different opening positions
Solution Approach 1:
The detection device performs self-configuration by automatically determining the position of the mobile part and selecting the appropriate power threshold without requiring manual intervention. The system self-adjusts the transmission power based on the detected position, eliminating the need for complex manual configuration while maintaining optimal transmission quality
Solution Approach 2:
The system uses feedback from the position detection (open or closed state) to automatically adjust the transmission power. The detection of the mobile part position provides feedback that triggers the selection of appropriate power thresholds, creating a closed-loop system that maintains transmission quality without user intervention
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 approach ensures effective radio signal transmission with reduced energy consumption and adherence to regulatory limits by dynamically adjusting transmission power based on the opening's position and environmental factors.
Implementation Method 1
a transmitter-receiver circuit (26) coupled to a radio antenna (28)
Implementation Method 2
measuring the electric power reflected by the antenna towards the transmitter-receiver circuit
Data Source
Figure 1
Figure 2
Figure 3
AI summary
This method of configuring a detection device (12) for the state of an opening (2), particularly in a building, the detection device comprising a processor (22), a computer memory (24) and a transmitter-receiver circuit (26) coupled to a radio antenna (28), includes steps consisting of: - acquiring (62, 64) data representative of a characteristic of the material forming the opening (2) and/or of a dimensional characteristic of the opening (2); - determining (66) a transmission power threshold for at least one position among an open position of the moving part and a closed position of the moving part, as a function of the acquired data; - recording (68) the power threshold associated with the acquired data in the memory (24) of the detection device.