WLAN Sensing Feedback Allocation for Low-Power Wideband Operation
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Solution Overview
Problem
Existing WLAN sensing technologies face challenges in efficiently utilizing power resources while performing broadband sensing operations, leading to excessive power consumption, especially in battery-operated devices, and there is a need for improved methods to enhance sensing accuracy and privacy protection.
Innovation Solution
A method is proposed where a WLAN sensing initiator transmits a sensing initiation frame with specific information to WLAN sensing responders, adjusts measurement granularity based on channel environment, and receives feedback frames with channel state information, allowing responders to concentrate power on allocated bandwidths, thereby optimizing power consumption and expanding operational range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If WLAN sensing responders perform broadband sensing operations across entire bands, then sensing accuracy and coverage are improved, but power consumption increases excessively
Solution Approach 1:
The patent divides the entire broadband sensing operation into multiple sub-bands and allocates them to different responders. Each responder measures only its allocated sub-band, reducing individual power consumption while collectively covering the entire bandwidth. The sensing initiation frame specifies the number of sub-bands and bandwidth information for allocation.
Solution Approach 2:
The patent applies different measurement granularities to different responders based on their capabilities and channel conditions. The sensing initiation frame includes measurement granularity information that allows each responder to adjust its measurement precision locally, optimizing the balance between sensing accuracy and power consumption for each device.
2Measurement precision
If WLAN sensing responders provide detailed feedback for all bands, then sensing accuracy is improved, but feedback overhead and processing complexity increase
Solution Approach 1:
The patent segments the feedback information into sub-band specific channel state information. Each responder provides feedback only for its allocated sub-band, reducing the total feedback overhead. The sensing initiation frame specifies the number of sub-bands for feedback, enabling the initiator to process smaller, more manageable feedback packets from each responder.
Solution Approach 2:
The patent implements partial feedback where responders provide channel state information for only a subset of bands (their allocated sub-bands) rather than all bands. This partial action reduces feedback overhead while still providing sufficient information for the initiator to reconstruct the overall channel state through aggregation.
3Adaptability or versatility
If WLAN sensing operates across expanded bandwidth, then sensing capability and operational range are improved, but power consumption and device requirements increase
Solution Approach 1:
The patent enables expanded operational range by segmenting the wide bandwidth into multiple sub-bands that can be distributed across multiple responders. This allows the system to achieve wideband sensing capability beyond what a single responder could handle, while each individual responder operates within its power and capability constraints on its allocated sub-band.
Solution Approach 2:
The patent creates a multi-functional sensing system where multiple responders with different capabilities can participate in the same sensing operation. Each responder performs the same sensing function on its allocated sub-band, and the initiator aggregates results to achieve universal wideband sensing capability that adapts to varying device capabilities.
Data Source
AI summary
In a wireless local area network system, a transmission STA may transmit a sensing start frame. The sensing start frame may include information related to the entire band in which WLAN sensing is performed, information related to a reception STA participating in the WLAN sensing, and information related to the number of bands K sensed by each reception STA and the bandwidth of the band sensed by the each reception STA. A transmission STA may transmit a sounding signal to the reception STA. A transmission STA may receive a feedback frame for the sounding signal from the reception STA. The feedback frame may include channel state information for K bands in the order of better channel state among the entire band.