RF Sensing Node Pair Assignment for Movable Object Tolerance
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Solution Overview
Problem
RF context-sensing arrangements face challenges in maintaining accuracy due to the influence of movable objects within the sensing volume, which affects the attenuation of RF signals and complicates the comparison of current RF-signal metrics with baseline values.
Innovation Solution
A pair-assignment device that ascertains position information of external RF-sensing nodes within a predefined sensing volume and assigns suitable transmitter-receiver pairs to perform RF context-sensing functions, taking into account the positions and potential influences of movable objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF signals are transmitted through multiple paths including reflections off walls, then signal reception is maintained, but the attenuation becomes difficult to interpret due to varying path lengths and object positions
Solution Approach 1:
The patent segments the RF signal paths into direct paths and reflected paths by analyzing the timing and characteristics of received signals. By separating these path types, the system can attribute attenuation differences to specific path configurations rather than treating all paths uniformly, thus improving measurement precision while maintaining reception reliability.
Solution Approach 2:
The patent introduces wall reflections as an intermediary mechanism that provides additional signal paths. By deliberately utilizing and analyzing these reflected signals, the system transforms what was previously a source of ambiguity into a useful indicator for determining object position and attenuation characteristics.
2Area of stationary object
If the sensing volume is made larger to cover more area, then the detection coverage increases, but the influence of movable objects on signal attenuation becomes more variable and harder to compensate
Solution Approach 1:
The patent adds the temporal dimension to the sensing approach by analyzing signal attenuation over time as objects move through the sensing volume. This time-series analysis allows the system to distinguish between static attenuation patterns and dynamic changes caused by movable objects, maintaining detection accuracy across a larger spatial area.
Solution Approach 2:
The system continuously monitors signal attenuation and uses this feedback to dynamically adjust the baseline values and detection thresholds. This adaptive feedback mechanism allows the system to compensate for the varying influence of movable objects within the extended sensing volume, maintaining reliability despite the increased coverage area.
3Ease of manufacture
If baseline values are established without considering movable objects, then the setup process is simplified, but the detection accuracy deteriorates when movable objects are present
Solution Approach 1:
The patent performs preliminary analysis of the sensing environment by establishing baseline signal characteristics in advance, before actual detection operations begin. These pre-established baselines capture the normal attenuation patterns without movable objects, providing a reference that simplifies subsequent detection while maintaining accuracy when objects are present.
Solution Approach 2:
The system transitions from static baseline values to dynamic baseline adjustment by continuously monitoring signal characteristics. When movable objects are detected, the system dynamically updates the baseline values to account for their presence, thereby maintaining measurement precision without requiring complex setup procedures.
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 increases the reliability of RF context-sensing by reducing the impact of movable objects on signal attenuation, allowing for more accurate detection of context situations such as presence or movement within the sensing volume.
Implementation Method 1
the relative attenuation the RF-signals suffer is also influenced by the sensing volume and the objects or subjects located therein
Implementation Method 2
signal forward and reflected backscatter of radiofrequency waves caused by the presence of a biological mass
Data Source
AI summary
The invention is related to a pair-assignment device (100) comprising a sensing-node position ascertainment unit (102) configured to ascertain position information (P.I.) pertaining to respective positions of external RF-sensing nodes (104,106) with respect to a predefined sensing volume (108) of a RF context-sensing arrangement and a pair-assigning unit (110) configured to assign, using the ascertained position information, at least one transmitter-receiver pair among the individual RF-sensing nodes of the RF context-sensing arrangement to perform a RF context-sensing function, to assign to the RF sensing nodes of the given transmitter-receiver pair a transmitter role (Tx) and a receiver role (Rx), respectively. The pair-assignment device then provides pair information indicative of the at least one assigned transmitter-receiver pair and the assigned transmitter and receiver roles and thus enables an increase of tolerance of the RF context-sensing arrangement against changes in the position of movable objects.