NDPA Frame Signaling for Wi-Fi Sensing and Ranging
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Solution Overview
Problem
The existing 802.11bf specification lacks a mechanism to indicate the use of null data packet (NDP) announcement frames for sensing applications, necessitating a solution to allow NDP frames to be used for specifying sounding, ranging, and sensing.
Innovation Solution
Reusing bits in the STA Info field of NDPA frames to indicate whether the frame exchange sequence is for sensing or ranging, including methods such as setting specific AID11 and Sensing subfields to predetermined values, redefining reserved bits, and using new subtype values to specify sensing NDPA frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NDP announcement frames are reused for sensing applications, then frame reusability and protocol efficiency are improved, but frame ambiguity and detection difficulty increase
Solution Approach 1:
The patent applies local quality by introducing a specific Sensing subfield within the STA Info field of the NDPA frame. This subfield is locally dedicated to indicating sensing frame type, allowing receivers to distinguish sensing frames from ranging frames based on the value of this specific field rather than requiring different frame formats entirely.
Solution Approach 2:
The patent uses color changes analogy by introducing a distinct indicator (Sensing subfield with specific values) that changes the 'appearance' or identification characteristics of the frame. This allows the same frame structure to be visually distinguished (detected) as a sensing frame versus a ranging frame through the specific field values.
2Device complexity
If existing NDPA frame structure is used without modifications, then device complexity is reduced, but sensing application capability is insufficient
Solution Approach 1:
The patent applies universality by making the NDPA frame structure multi-functional. The same frame structure used for ranging is also used for sensing, with the distinction made through the Sensing subfield. This allows a single frame format to serve multiple purposes (ranging and sensing), reducing the need for separate dedicated frame structures for each application.
Solution Approach 2:
The patent uses parameter changes by modifying the interpretation of existing fields through the introduction of the Sensing subfield. By changing the parameter values in the STA Info field (specifically setting the Sensing subfield to indicate sensing mode), the frame's function is changed from ranging to sensing without altering the overall frame structure.
3Measurement precision
If sensing NDPA frames are clearly indicated through additional fields, then frame identification accuracy is improved, but frame format complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the STA Info field into distinct subfields, including a dedicated Sensing subfield. This segmentation allows the sensing indication to be isolated in a specific portion of the frame, making it easily identifiable without requiring complex analysis of the entire frame structure.
Data Source
AI summary
Various embodiments relate to a first wireless device configured to establish sensing with a second wireless device, including: a transmitter configured to: transmit a null data packet announcement (NDPA) frame to the second wireless device configured to include an indication that the NDPA frame is a sensing NDPA frame; transmit a null data packet (NDP) frame to the second wireless device; a receiver configured to: receive a frame from the second wireless device indicating sensing information.