WLAN NDP Preamble Configuration for EHT Channel Sounding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless local area network (WLAN) systems face challenges in supporting high throughput and high data rates, particularly with the emerging extreme high throughput (EHT) standard, which requires improved channel sounding and beamforming techniques for multi-link operations.
Innovation Solution
The proposed solution involves configuring a Null Data Physical Layer Protocol Data Unit (NDP) frame with a first and second signal field, where the first field includes PHY version information and the second field is duplicated based on a wider bandwidth, enabling channel sounding and supporting high throughput and multi-link operations in the EHT standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wide bandwidth (e.g., 160/320 MHz) is used to support high throughput in EHT standard, then data rate is improved, but frame format complexity increases
Solution Approach 1:
The signal fields are segmented into multiple instances corresponding to different bandwidth segments. For example, when 320 MHz bandwidth is used, the HE-SIG-B field is divided into multiple instances, each carrying information for a specific 160 MHz segment. This segmentation allows the receiver to process information in manageable portions while supporting wide bandwidth operation.
Solution Approach 2:
The patent introduces a new dimension of organization by mapping signal fields across multiple bandwidth segments rather than treating the wide bandwidth as a single unit. This dimensional approach to field configuration enables systematic management of complexity in wide bandwidth frames.
2Measurement precision
If HE-SIG-B field is duplicated on smaller bandwidth, then channel sounding capability is improved, but preamble structure complexity increases
Solution Approach 1:
The HE-SIG-B field is segmented and duplicated across multiple bandwidth segments. Each instance of HE-SIG-B contains channel sounding information for its corresponding segment, enabling the receiver to acquire comprehensive channel information across the entire bandwidth by processing these segmented copies.
Solution Approach 2:
The HE-SIG-B field is copied multiple times across different bandwidth segments. This copying mechanism ensures that channel sounding information is replicated throughout the preamble structure, providing redundant information that enhances measurement precision while maintaining a systematic pattern that manages structural complexity.
3Adaptability or versatility
If multiple signal fields are included in NDP frame, then beamforming capability is improved, but processing time increases
Solution Approach 1:
Different signal fields are configured with different qualities and levels of detail appropriate to their specific functions. Critical beamforming information is concentrated in key fields like HE-SIG-B, while other fields provide supporting information. This localized quality distribution enables efficient processing by focusing computational resources on the most critical beamforming parameters.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3
AI summary
One example according to the present specification relates to a technique related to configuration of a preamble in a wireless LAN (WLAN) system. According to various embodiments, a receiving STA may receive an NDP frame. The NDP frame may comprise a first signal field and a second signal field. The first signal field may comprise first information about a PHY version. The second signal field may comprise second information about transmission of a PPDU, set on the basis of the first information. The receiving STA may perform channel sounding on the basis of the NDP frame.