4X LTF Sequence for 320 MHz WLAN Bandwidth Utilization
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Solution Overview
Problem
Current wireless local area network (WLAN) systems face challenges in transmitting and receiving signals efficiently over the 320 MHz band, particularly in supporting new communication standards like the extreme high throughput (EHT) standard, which requires optimized Long Training Field (LTF) sequences for improved bandwidth utilization and error correction.
Innovation Solution
A specific LTF sequence is defined for the 80 MHz band, comprising a combination of sequences that enable efficient transmission and reception of signals suitable for the 320 MHz tone plan, enhancing the physical protocol data unit (PPDU) structure and hybrid automatic repeat request (HARQ) schemes in the IEEE 802.11be standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional LTF sequences are used for 320 MHz band transmission, then compatibility with existing standards is maintained, but bandwidth utilization efficiency deteriorates
Solution Approach 1:
The 320 MHz band LTF sequence is segmented into multiple 80 MHz sub-sequences (first through fourth sequences), each corresponding to an 80 MHz sub-band. This segmentation allows efficient utilization of the wide bandwidth while maintaining manageable sequence structures that can be independently processed and transmitted across different frequency sub-bands.
Solution Approach 2:
The LTF sequence structure employs nesting by embedding multiple 80 MHz sub-sequences within the overall 320 MHz sequence framework. The nested structure includes pilot sequences embedded within data sequences, and further nesting of HE-LTF and EHT-LTF sequences within the PPDU structure, enabling hierarchical processing and improved bandwidth efficiency.
2Reliability
If LTF sequences are optimized for 320 MHz tone plan, then error correction capability is improved, but compatibility with existing 80 MHz sequences deteriorates
Solution Approach 1:
The LTF sequence design applies local quality by optimizing specific portions of the sequence (pilot sequences and zero sequences) for enhanced error correction in the 320 MHz band, while maintaining standard-compliant data sequences. This allows localized improvements in reliability without compromising overall standard compatibility.
Solution Approach 2:
Instead of adapting existing 80 MHz sequences to work in 320 MHz band, the patent inverts the approach by designing native 320 MHz optimized sequences that inherently provide improved error correction, then mapping them to the wider bandwidth. This reversal enables superior performance while maintaining compatibility through proper mapping relationships.
3Productivity
If PPDU structure is enhanced for EHT standard, then communication efficiency is improved, but implementation complexity deteriorates
Solution Approach 1:
The PPDU structure is designed with dynamic characteristics by allowing flexible configuration of LTF sequences based on bandwidth requirements. The structure can adaptively switch between different sequence lengths and pilot densities depending on whether 80 MHz or 320 MHz operation is selected, enabling efficient communication while managing implementation complexity through conditional configuration.
Solution Approach 2:
The enhanced PPDU structure achieves universality by designing a flexible framework that can operate across multiple bandwidth configurations (80 MHz and 320 MHz). The same basic structure serves multiple functions by adjusting sequence parameters, eliminating the need for entirely separate protocol implementations for different bandwidths and thereby managing complexity.
Data Source
AI summary
The present disclosure is related to a long training field (LTF) sequence for 320 MHz band transmission in a wireless local area network system. The main features comprise the steps of: generating a physical protocol data unit (PPDU); and transmitting the PPDU through a 320 MHz band, wherein the PPDU includes an LTF signal and the LTF signal is generated on the basis of an LTF sequence for the 320 MHz band. Therefore, the proposed LTF has improved effects such as increased bandwidth, an improved PHY layer protocol data unit (PPDU) structure, an improved sequence, and use of a hybrid automatic repeat request (HARQ) technique.