WLAN Trigger Frame Sensing Subfields for Coordinated Channel Measurement
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems lack efficient methods for wireless sensing, particularly in Infrastructure Basic Service Set (BSS) mode, where stations (STAs) within the BSS may require coordinated sensing mechanisms to optimize channel measurements and resource allocation.
Innovation Solution
The proposed solution involves a method and STA design for WLAN sensing, where a STA receives a trigger frame with specific sensing subfields based on the trigger type. The STA then sends a trigger response frame formatted according to the sensing subfields, enabling coordinated sensing operations, including ranging and NDP sounding polls, to facilitate efficient channel measurements and resource management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If WLAN systems use traditional communication protocols without sensing-specific mechanisms, then device compatibility is maintained, but sensing functionality and measurement accuracy are insufficient
Solution Approach 1:
The patent segments the MAC frame into specialized fields for sensing operations, including trigger frames with sensing-specific subfields, user information fields with sensing parameters, and response frames with measurement results. This segmentation allows traditional WLAN communication to coexist with enhanced sensing capabilities without compromising compatibility.
Solution Approach 2:
The patent creates a multi-functional trigger frame structure that can serve both traditional WLAN coordination functions and specialized sensing operations. The trigger frame includes universal fields for general communication and sensing-specific fields for measurement operations, enabling a single frame type to perform multiple functions across different WLAN modes.
2Measurement precision
If WLAN systems implement coordinated sensing mechanisms with multiple STAs, then sensing capability is enhanced, but frame format complexity and processing overhead increase
Solution Approach 1:
The patent divides the sensing coordination process into distinct frame types with specialized fields: trigger frames initiate sensing with sensing-specific subfields, user information fields contain sensing parameters, and response frames carry measurement results. This segmentation manages complexity by assigning specific functions to each frame component rather than using a monolithic complex frame structure.
Solution Approach 2:
The trigger frame structure includes dynamic fields that can be configured based on the specific sensing operation requirements. The trigger type subfield and sensing trigger subtype subfield allow the frame format to adapt dynamically to different sensing modes (poll, NDP soliciting, report, threshold-based result collection, group NDP soliciting), enabling flexibility without requiring multiple static frame formats.
3Ease of operation
If WLAN systems use detailed sensing subfields and parameters in trigger frames, then sensing operation control is improved, but processing time and computational overhead increase
Solution Approach 1:
The trigger frame contains pre-configured sensing parameters and instructions in its subfields (sensing trigger subtype, measurement setup identification, measurement instance identification, session setup identification). By providing all necessary sensing operation details in advance within the trigger frame, STAs can execute sensing operations without requiring additional negotiation or processing steps, thereby reducing overall processing time despite the detailed parameter specification.
Solution Approach 2:
The sensing STAs autonomously process the trigger frame contents and execute sensing operations based on the included parameters and instructions. Each STA independently interprets the trigger type subfield, sensing trigger subtype subfield, and other subfields to perform the appropriate sensing action, eliminating the need for centralized coordination or additional control messages and thus reducing processing overhead.
Data Source
AI summary
A method and station (STA) for WLAN sensing is disclosed. A STA may receive a trigger frame which may comprise at least a common information field that may comprise at least a trigger type subfield and a trigger dependent common information subfield. The trigger dependent common information subfield may comprise sensing subfields that are based on a value of the trigger type subfield. The STA may send a trigger response frame in a format that is at least based on at least one of the sensing subfields. The trigger frame may comprise a user information field which may comprise a trigger dependent user information subfield. The trigger dependent user information subfield may comprise at least a threshold value subfield and an indication of results collection subfield. Information in the trigger response frame may be at least based on the threshold value subfield and the indication of results collection subfield.