WLAN CSI Feedback Scaling for Efficient Sensing Reports
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Solution Overview
Problem
Existing wireless LAN systems lack efficient methods for performing sensing procedures, setting scaling factors for CSI information, and transmitting and receiving encoded CSI feedback.
Innovation Solution
A method involving a first station obtaining a CSI matrix, determining a scaling factor based on a 2's complement value, and transmitting a CSI report field, while a second station decodes the CSI feedback using the scaling factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing procedures are performed using wireless LAN signals, then object sensing capability is improved, but system complexity increases
Solution Approach 1:
The patent enables wireless LAN devices to perform both communication and sensing functions using the same hardware infrastructure. The channel state information (CSI) obtained for communication purposes is reused for sensing applications, allowing a single system to serve multiple functions without requiring separate dedicated sensing hardware.
Solution Approach 2:
The patent introduces an intermediary processing mechanism where CSI data serves as a bridge between communication signals and sensing information. By extracting sensing-relevant features from communication-oriented CSI data through standardized reporting procedures, the system translates communication signals into useful sensing measurements without direct hardware modification.
2Measurement precision
If CSI feedback is transmitted with high precision, then sensing accuracy is improved, but feedback overhead increases
Solution Approach 1:
The patent dynamically adjusts the precision and granularity of CSI feedback parameters based on sensing requirements. By selectively reporting only the most relevant CSI components and adjusting the resolution of reported values, the system maintains adequate sensing accuracy while reducing the volume of feedback data transmitted.
Solution Approach 2:
The patent implements partial CSI feedback reporting where only the essential components needed for sensing are transmitted. Instead of reporting complete CSI matrices, the system selectively reports specific elements or processed features that are most critical for sensing applications, reducing overhead while preserving sensing performance.
Data Source
AI summary
Disclosed are a method and device for performing a sensing procedure in a wireless LAN system. The method for performing a sensing procedure by a first station (STA) in a wireless LAN system according to one embodiment of the present disclosure may comprise the steps of: obtaining a CSI matrix on the basis of NDP received from a second STA; obtaining a scaling factor on the basis of a two's complement value associated with a maximum value from among the CSI matrix; obtaining a CSI feedback by performing scaling and quantization on the basis of the scaling factor with respect to the CSI matrix; and transmitting a CSI report field comprising the scaling factor and the CSI feedback to the second STA.