NDPA Frame Variant Indication for Future Wi‑Fi Sounding
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Solution Overview
Problem
The existing NDPA frame format in IEEE 802.11be Draft 1.0 is limited to indicating only a few NDPA variants, such as VHT, HE, and EHT R1, and does not support future amendment versions.
Innovation Solution
An enhanced NDPA frame format is introduced, utilizing additional bits in the sounding dialog token field to indicate the presence of a separate NDPA variant field, which can include up to 16 bits for various NDPA variants, supporting future amendments and accommodating vendor-specific frames without creating additional control frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the existing NDPA frame format is used, then the frame structure remains simple and legacy devices can understand it, but it can only indicate a limited number of NDPA variants and does not support future amendment versions
Solution Approach 1:
The patent embeds a variant indication field within the existing sounding dialog token field of the NDPA frame. The sounding dialog token field is divided into a variant indication portion and a token number portion, allowing the frame to carry additional variant information without increasing the overall frame structure or requiring separate control frames.
Solution Approach 2:
The sounding dialog token field is made multi-functional by using part of it (the variant indication portion) to indicate NDPA variants while the rest (token number portion) maintains its original function. This allows a single field to serve multiple purposes: identifying both the variant type and the token number.
2Adaptability or versatility
If additional control frames are created to support future NDPA variants, then all variants can be indicated, but the number of control frames increases and protocol complexity increases
Solution Approach 1:
The patent merges the variant indication function with the existing sounding dialog token field. Instead of creating separate control frames for different variants, the variant information is combined into the same field that already carries token number information, reducing the total number of control frames needed.
3Adaptability or versatility
If the sounding dialog token field is used to indicate variants, then the frame format can support future variants, but the field must be divided into multiple portions reducing flexibility
Solution Approach 1:
The sounding dialog token field is segmented into two distinct portions: a variant indication portion and a token number portion. This segmentation allows each portion to independently serve its specific function while together they maintain the original field's identity and compatibility.
Data Source
AI summary
The present disclosure provides methods and apparatus related to NDPA frame indication. An aspect of the disclosure provides a method. The method includes sending, to one or more stations (STAs), a request for channel state information (CSI). The request includes a null data packet announcement (NDPA) frame including a first field and a second field. The first field indicates presence of the second field, and the second field indicates a variant of the NDPA frame. The method further includes receiving, from the one or more STAs, a CSI feedback response based on the request. In some embodiments, the first field is one of a sounding dialog token field and indicates the presence of the second field via at least two bits. In some embodiments, the first field is a frame control field and indicates the second field via a 4-bit subtype subfield.