WLAN PPDU Training Field Structure for Simultaneous Beam Refinement
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Solution Overview
Problem
Existing WLAN systems lack a method for simultaneously supporting transmit beam refinement protocol (TX BRP) and receive beam refinement protocol (RX BRP) using a new physical layer protocol data unit (PPDU) format.
Innovation Solution
A method involving a first station generating and transmitting a PPDU with data and training fields, and a second station receiving the PPDU to perform TX and RX BRP based on R training fields, each comprising N TRN units with P TRN subfields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new PPDU format is introduced to support simultaneous TX BRP and RX BRP, then beam refinement capability is improved, but device complexity increases
Solution Approach 1:
The training field is segmented into multiple TRN fields, each TRN field contains multiple TRN units, and each TRN unit contains multiple TRN subfields. This hierarchical segmentation allows the system to support simultaneous TX BRP and RX BRP through structured organization of training signals, enabling independent processing of transmit and receive beam refinement while maintaining manageable device complexity through modular design
Solution Approach 2:
The new PPDU format with R TRN fields serves multiple functions: it supports both TX BRP and RX BRP simultaneously, maintains compatibility with existing WLAN standards through the hierarchical structure (R TRN fields, N TRN units, P TRN subfields), and provides a universal framework that can accommodate different beam refinement scenarios without requiring separate protocols for each function
2Loss of information
If multiple TRN fields are included in the PPDU, then training information completeness is improved, but transmission overhead increases
Solution Approach 1:
The training field structure implements a nested hierarchy where R TRN fields are contained within the PPDU, each TRN field contains N TRN units, and each TRN unit contains P TRN subfields. This nested structure allows comprehensive training information to be organized efficiently, where smaller units (TRN subfields) are grouped into larger structures (TRN fields), maximizing information completeness while minimizing overhead through compact hierarchical packaging
Solution Approach 2:
The patent introduces a multi-dimensional structure for training information organization: R dimensions for TRN fields, N dimensions for TRN units within each field, and P dimensions for TRN subfields within each unit. This dimensional expansion allows the system to convey comprehensive training information across multiple layers without linearly increasing overhead, as the hierarchical structure enables efficient encoding and processing at each level
Data Source
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AI summary
A method and a device for transmitting or receiving training information in a wireless LAN system are disclosed. A method performed by a first station (STA) in a wireless LAN system according to an embodiment of the present disclosure may comprise the steps of: generating one or more fields including R number of training (TRN) fields; and transmitting, to a second STA, a physical layer protocol data unit (PPDU) including a data field and the one or more fields located after the data field. Each of the R number of TRN fields may include N number of TRN units, and each of the N number of TRN units may include P number of TRN subfields.