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 that utilize a plurality of spatial streams and receive chain pairs for enhanced CSI feedback, including a sensing-announcement frame with additional fields for frame setup information, and the use of 4×LTF type long-training fields for improved channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing sensing procedures use standard frame structures and CSI feedback mechanisms, then device complexity remains manageable, but CSI measurement accuracy is insufficient
Solution Approach 1:
The patent segments the CSI feedback into multiple components: a first CSI feedback containing quantized CSI values and a second CSI feedback containing scale factors. This segmentation allows each component to be optimized independently, improving measurement precision while managing complexity through structured information division.
Solution Approach 2:
The patent changes the parameters of CSI feedback by introducing scale factors that dynamically adjust the quantization range. The scale factors are computed based on the actual CSI values and used to normalize subsequent feedback, enabling adaptive precision adjustment that improves measurement accuracy without requiring fixed complex frame structures.
2Adaptability or versatility
If existing sensing procedures use fixed CSI feedback formats, then ease of operation is maintained, but adaptability for improved sensing capabilities is limited
Solution Approach 1:
The patent introduces dynamic elements to the CSI feedback format through scale factors that can be computed and applied based on current sensing conditions. The scale factors adapt the feedback precision dynamically, allowing the system to adjust to different sensing requirements while maintaining a relatively simple base frame structure.
Solution Approach 2:
The patent implements a feedback mechanism where the receiving station computes scale factors based on received CSI values and feeds back adjusted CSI information. This feedback loop enables continuous adaptation to changing sensing conditions while maintaining operational simplicity through automated adjustment.
3Measurement precision
If existing sensing procedures use basic spatial stream processing, then device complexity is low, but measurement precision and sensing accuracy are insufficient
Solution Approach 1:
The patent applies local quality by computing scale factors specific to each spatial stream and receive chain pair. Instead of using a uniform processing approach, the system tailors the CSI quantization and scaling to local conditions, improving measurement precision for each spatial dimension while managing overall complexity through targeted processing.
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.