Passive RF Ranging Pair Selection for Faster Indoor Positioning
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining the location of passive stations (PSTAs) due to inefficient selection of responding station (RSTA) and initiating station (ISTA) pairs, leading to increased convergence time and power consumption in passive ranging processes, especially in dense indoor environments.
Innovation Solution
A method for selecting specific RSTA-ISTA pairs based on predetermined RF signal metrics, reducing power consumption and improving convergence time by targeted listening strategies, enabling precise location estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all available RSTA-ISTA pairs are used for passive ranging, then positioning accuracy is improved, but power consumption and convergence time increase
Solution Approach 1:
The patent applies local quality by selectively evaluating and utilizing RSTA-ISTA pairs based on their specific characteristics (RSSI, AoA, SNR, DToA) rather than treating all pairs uniformly. The system identifies local optima in terms of signal quality and geometric distribution, focusing computational resources on the most informative pairs while discarding redundant ones, thus achieving accurate positioning with reduced power consumption.
Solution Approach 2:
The patent changes the parameters used for evaluating RSTA-ISTA pairs by incorporating multiple metrics (RSSI, AoA, SNR, DToA) and dynamically adjusting the selection criteria based on signal conditions. This allows the system to adaptively choose the optimal subset of pairs that balances positioning accuracy with energy efficiency, resolving the contradiction between using more pairs for better accuracy and using fewer pairs for lower power consumption.
2Measurement precision
If all available RSTA-ISTA pairs are used for passive ranging, then positioning accuracy is improved, but convergence time increases
Solution Approach 1:
The patent applies preliminary action by pre-evaluating and pre-selecting optimal RSTA-ISTA pairs based on stored signal characteristics and geometric information before the actual ranging process. The system performs preliminary filtering of pairs that are likely to be redundant or less informative, preparing a curated subset in advance that accelerates convergence while maintaining positioning accuracy.
Solution Approach 2:
The patent dynamically adjusts the selection parameters for RSTA-ISTA pairs based on real-time signal conditions and geometric relationships. By changing the evaluation criteria adaptively, the system can quickly converge on the optimal subset of pairs without requiring exhaustive search through all possible combinations, thus reducing convergence time while preserving positioning accuracy.
3Measurement precision
If more RSTA-ISTA pairs are selected for passive ranging, then positioning accuracy is improved, but device resources are consumed more heavily
Solution Approach 1:
The patent applies local quality by evaluating each RSTA-ISTA pair individually based on its specific signal characteristics and geometric contribution to positioning. Rather than uniformly processing all pairs, the system identifies and processes only the locally optimal pairs that provide the most value for positioning accuracy, thereby reducing overall device resource consumption while maintaining high positioning precision.
Solution Approach 2:
The patent applies partial action by selecting and processing only the necessary subset of RSTA-ISTA pairs rather than all available pairs. The system uses criteria based on signal quality metrics and geometric distribution to determine the minimum sufficient set of pairs needed for accurate positioning, avoiding excessive processing of redundant pairs and thus reducing device resource consumption.
Data Source
AI summary
In some implementations, a passive station (PSTA) may determine one or more responding station (RSTA)-initiating station (ISTA) pairs from a plurality of RSTAs and a plurality of ISTAs, based on one or more measurements of one or more radio frequency (RF) signals received from stations of the plurality of RSTAs and ISTAs. In addition, the PSTA may obtain ranging measurements determined based on packets transmitted between the one or more RSTA-ISTA pairs. The PSTA may determine a location estimate of the PSTA based on the ranging measurements.