Wi-Fi Sensing Announcement Frames for Accurate CSI Measurement
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Solution Overview
Problem
Existing Wi-Fi sensing procedures are limited by inaccurate CSI measurements and inadequate frame structures, which hinder the potential for improved sensing capabilities.
Innovation Solution
A method and frame structure for Wi-Fi sensing that utilizes spatial streams and receive chain pairs for enhanced CSI feedback, including the computation of CSI coefficients and scale ratios per stream-RX chain pair, and the use of enhanced sensing announcement frames with additional fields for setup information and bandwidth indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing sensing procedures use standard frame structures, then device complexity is reduced, but measurement precision (CSI measurement accuracy) deteriorates
Solution Approach 1:
The frame structure is segmented into distinct components: sensing announcement frame (SAF) for setup information, sensing null data packet (NDP) for signal transmission, and CSI feedback frame for measurements. This segmentation allows each component to be optimized independently, improving CSI measurement accuracy while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent introduces additional dimensions to the frame structure by adding spatial stream (SS) and receive chain (RX chain) pairings,以及preamble puncturing patterns. These additional dimensions enable more precise CSI measurements across multiple spatial and temporal dimensions without fundamentally redesigning the entire frame structure.
2Measurement precision
If existing sensing procedures use basic feedback mechanisms, then ease of operation is maintained, but measurement precision (CSI measurement accuracy) deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the responder STA sends CSI feedback frames back to the initiating STA. This feedback loop enables continuous refinement of sensing procedures and improves measurement precision while maintaining ease of operation through automated feedback processing.
Solution Approach 2:
The patent changes key parameters including adding scale ratio information, modifying CSI coefficient calculations to include spatial stream and receive chain pairings, and updating frame structure parameters. These parameter changes enhance measurement precision while the changes are applied in a backward-compatible manner to maintain ease of operation.
3Measurement precision
If more spatial streams and receive chains are used, then measurement precision (CSI measurement accuracy) improves, but device complexity increases
Solution Approach 1:
The processing complexity is segmented by organizing calculations per spatial stream and per receive chain pair independently. This segmentation allows the system to handle multiple spatial streams and receive chains through parallel processing of discrete units, improving measurement precision while managing overall complexity through structured computation.
Solution Approach 2:
The patent enables the system to use more spatial streams and receive chains than traditionally supported, with the option to activate only the necessary number based on the sensing task requirements. This partial action approach allows the system to scale complexity up when needed while maintaining simplicity for basic operations.
Data Source
AI summary
A procedure and frame structure for Wi-Fi sensing is described. An aspect of the disclosure provides a method of sensing. Such a method includes sending, by an initiating station (STA) to one or more responder STAs, a sensing request comprising a sensing announcement frame (SAF) indicating sensing set-up information including frame structure information. The SAF includes at least one field indicating the frame structure information including one or more of: a sensing set-up identifier (ID), an SAF version ID, a sensing session ID, a measurement set-up ID, and a measurement instance ID. The method further includes receiving, by the initiating STA from the one or more responder STAs, one or more responses based on the sensing request.