RF Sensing Sounding Sequences for Accurate Environmental Detection
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Solution Overview
Problem
Existing RF sensing techniques face challenges in accurately detecting changes in wireless communication channels due to compression of channel state information (CSI) and lack of clear indication of transmission and reception parameters, which can attribute changes to environmental or device parameter variations.
Innovation Solution
The method involves transmitting sounding sequences with sounding control information to a receiver device, allowing it to generate channel reports only when significant changes occur, and including CSI that is not compressed, along with parameters like transmit and receive antenna indexes, to accurately attribute changes to environmental movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If channel state information (CSI) is compressed for transmission, then transmission overhead is reduced, but measurement precision and sensing accuracy deteriorate
Solution Approach 1:
The patent extracts only the essential parameters needed for RF sensing (antenna indexes, selected CSI values) from the complete CSI data set, transmitting only these extracted elements rather than compressed or complete CSI. This allows overhead reduction while preserving sensing accuracy by focusing on the most relevant parameters for detecting environmental changes.
Solution Approach 2:
The patent applies local quality by differentiating between parameters that require high precision (antenna indexes for spatial resolution, selected CSI values for sensing) and parameters that can be transmitted with less detail. The receiver device generates reports containing only the locally optimized set of parameters necessary for accurate RF sensing, rather than uniformly compressing all CSI data.
2Measurement precision
If complete channel state information (CSI) is transmitted without compression, then measurement precision is improved, but transmission overhead increases
Solution Approach 1:
The patent extracts only the essential parameters needed for RF sensing (antenna indexes, selected CSI values) from the complete CSI data set, transmitting only these extracted elements rather than compressed or complete CSI. This allows overhead reduction while preserving sensing accuracy by focusing on the most relevant parameters for detecting environmental changes.
3Loss of information
If channel reports are transmitted frequently, then information exchange is improved, but productivity of the communication channel deteriorates
Solution Approach 1:
The patent implements periodic action by having the receiver device generate channel reports only at specific intervals or when triggered by significant channel changes, rather than continuously transmitting reports. The transmitter device sends sounding sequences periodically, and the receiver responds with reports only when necessary, reducing channel overhead while maintaining adequate information exchange for RF sensing applications.
Solution Approach 2:
The patent uses feedback mechanisms where the receiver device monitors channel conditions and determines when to generate reports based on actual changes in the wireless channel. This feedback-driven approach ensures reports are transmitted only when meaningful information is available, improving channel efficiency while maintaining sensing accuracy.
4Measurement precision
If device parameters (transmit antenna indexes, receive antenna indexes) are clearly indicated, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and transmits only the essential device parameters (antenna indexes) that are critical for RF sensing, rather than managing and transmitting all possible device configuration parameters. This selective extraction reduces parameter management complexity while preserving the precision needed for accurate environmental change detection.
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 enhances the accuracy of RF sensing by providing detailed CSI and reducing overhead, allowing for better detection of environmental changes and movement, while maintaining channel integrity.
Implementation Method 1
transmitting sounding sequences over a wireless channel to a receiver device, the sounding sequences configured for obtaining channel state information (CSI) of the wireless channel
Implementation Method 2
electromagnetic signals transmitted by a transmitting device may reflect off objects and surfaces in the environment before reaching a receiving device located a distance away
Implementation Method 3
A receiving device may detect and characterize such changes to its received signals to determine the speed or direction of the person's movement
Data Source
AI summary
This disclosure provides methods, devices and systems for radio frequency (RF) sensing in wireless communication systems. In some implementations, a transmitter device transmits sounding sequences configured for channel estimation over a wireless channel to a receiver device. The transmitter device also transmits or receives non-sounding frames associated with a channel report of the receiver device. The transmitter device transmits a frame soliciting the channel report from the receiver device. The transmitter device receives the channel report, which may include channel state information (CSI) of the wireless channel responsive to at least the sounding sequences. Some types of channel reports may take longer to generate than other types of channel reports. Transmitting or receiving the non-sounding frames during the time period may prevent other devices from accessing the wireless channel when the receiver device needs additional time to generate a certain type of channel report.