WLAN Sensing Frame Sequencing for Privacy and Frequency Use
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Solution Overview
Problem
Existing WLAN sensing technologies face challenges in efficiently utilizing frequency resources and ensuring privacy protection, particularly in the context of emerging standards like IEEE 802.11bf, which aim to integrate communication and radar technologies.
Innovation Solution
A method is introduced for WLAN sensing that involves transmitting a sensing initiation frame with a session identifier and information about the STA group, followed by a sounding frame, and receiving a feedback frame to identify a target, distinguishing control information and actual sensing signals through specific frame definitions and procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If WLAN sensing technology is implemented using conventional methods, then sensing functionality can be achieved, but frequency utilization efficiency remains limited and privacy concerns arise
Solution Approach 1:
The patent segments the sensing process into distinct phases: sensing initiation frame transmission, sounding frame transmission, and feedback frame reception. This segmentation allows for optimized resource allocation in each phase, improving overall frequency utilization efficiency while maintaining sensing accuracy through dedicated control and data channels.
Solution Approach 2:
The sensing initiation frame is transmitted before the actual sensing operation to establish control parameters, STA group identification, and resource allocation. This preliminary action enables the system to prepare frequency resources and privacy protection mechanisms in advance, improving efficiency without compromising sensing reliability.
2Adaptability or versatility
If WLAN sensing is performed without standardized procedures, then flexibility is maintained, but sensing performance and privacy protection are compromised
Solution Approach 1:
The patent creates a universal sensing framework that can accommodate multiple sensing operations (motion detection, positioning, etc.) through a standardized procedure. The sensing initiation frame includes flexible STA group identification fields that can adapt to different sensing scenarios while maintaining consistent performance through standardized sounding and feedback mechanisms.
Solution Approach 2:
The standardized procedure allows dynamic parameter changes within defined ranges, such as adjusting the number of sounding frames, feedback granularity, and STA group composition. This enables flexibility in adapting to different sensing requirements while ensuring performance through standardized parameter validation and bounds.
3Device complexity
If control information and sensing signals are combined in a single frame, then device complexity is reduced, but sensing accuracy and privacy protection deteriorate
Solution Approach 1:
The patent separates control information (sensing initiation frame) from sensing signals (sounding frame) and results (feedback frame). This segmentation improves sensing accuracy by dedicating specific frames to specific functions, reducing interference and enabling optimized processing for each frame type, while privacy protection is enhanced through controlled information disclosure in separate phases.
Solution Approach 2:
The sensing initiation frame acts as an intermediary that coordinates between the control plane and data plane. It carries necessary control information to initiate sensing operations without containing the actual sensing data, thereby separating control functions from sensing functions while maintaining system coordination and improving both accuracy and privacy.
4Object-affected harmful factors
If privacy protection measures are strengthened in WLAN sensing, then user privacy is better protected, but system functionality and sensing capability are limited
Solution Approach 1:
The patent extracts and processes only necessary sensing information through standardized procedures, avoiding collection of excessive personal data. The feedback frame contains only essential channel state information required for sensing operations, not raw personal data, thereby protecting privacy while maintaining sensing functionality across multiple applications through efficient information extraction.
Solution Approach 2:
The system dynamically adjusts sensing parameters such as measurement granularity, reporting frequency, and information detail level based on application requirements and privacy settings. This allows the same standardized framework to support diverse sensing applications from coarse-grained presence detection to fine-grained positioning, adapting privacy protection levels without limiting overall system capability.
Data Source
AI summary
A transmitting STA can transmit a sensing initiation frame to a first receiving STA in a wireless local area network (wireless LAN) system. The sensing initiation frame can include information related to an STA for transmitting a sounding frame and a session identifier (ID) related to an STA group that is to perform sensing. The transmitting STA can transmit the sounding frame to the first receiving STA. The transmitting STA can receive a first feedback frame for the sounding frame from the first receiving STA. The sounding frame can be a frame transmitted to identify a target. The first feedback frame can include information about a channel changed by means of the target. The sounding frame can include a null data packet announcement (NDPA) frame and a null data packet (NDP) frame.