PPDU Format Auto-Detection in 6 GHz Wireless Networks
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Solution Overview
Problem
Legacy WLAN devices operating in the 6 GHz band face challenges with coexistence of PPDU formats and limited communication range due to lower transmission power, necessitating a method for auto-detection of new PPDU formats and range extension.
Innovation Solution
Introduction of new PPDU formats that include repeated legacy and non-legacy signal fields, along with repeated training fields, to enable auto-detection and extend communication range, ensuring backwards compatibility with previous standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If new PPDU formats are introduced for 6 GHz band operations, then communication efficiency and range are improved, but device complexity and format detection difficulty increase
Solution Approach 1:
The patent introduces a repeated legacy signal field (RL-SIG) as an intermediary element that bridges old and new PPDU formats. This repeated field serves as a detection marker that allows devices to identify new formats without requiring complex analysis of the entire frame structure, thus extending communication range while managing detection complexity.
Solution Approach 2:
The patent uses modulation scheme changes (Q-BPSK for HT-SIG versus BPSK for VHT-SIG-A) as a detectable characteristic to differentiate between PPDU formats. This 'color change' in modulation allows receiving devices to quickly identify the format type through simple signal analysis rather than complex structural examination.
2Measurement precision
If legacy signal fields are repeated in new PPDU formats, then auto-detection capability is improved, but frame structure complexity increases
Solution Approach 1:
The patent creates a copy of the legacy signal field (L-SIG) and places it immediately after in the new PPDU format. This copying approach enables receiving devices to perform autocorrelation detection and identify the repeated pattern, achieving high detection accuracy without requiring complex new field structures.
Solution Approach 2:
The repeated legacy signal field is positioned early in the PPDU structure, before the data payload and other fields. This preliminary placement allows format detection to occur before full frame processing, enabling quick format identification and simplifying subsequent processing steps.
3Object-affected harmful factors
If transmission power is reduced in 6 GHz band due to regulations, then interference to other services is reduced, but communication range is limited
Solution Approach 1:
The patent employs repeated signal fields (both legacy and new) within the PPDU structure, creating periodic signal patterns that enhance signal detectability and effective range. This periodic reinforcement of signal presence allows communication to maintain reliability at lower transmission powers by improving signal-to-noise ratio through repetition.
Data Source
AI summary
Disclosed herein is a method performed by a wireless device operating in a wireless network to transmit a physical layer protocol data unit (PPDU) having a PPDU format that can be auto-detected. The method includes generating a PPDU that includes a legacy signal field, a repeated legacy signal field, a non-legacy signal field, and a repeated non-legacy signal field and wirelessly transmitting the PPDU, wherein non-legacy wireless devices are able to determine that the PPDU has a particular non-legacy PPDU format based on detecting repetitions of the legacy signal field and the non-legacy signal field in the PPDU.