Distributed Resource Unit Tone Plan for Low-Latency WLAN
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Solution Overview
Problem
Existing wireless LAN systems face challenges in providing advanced wireless communication environments with improved transmission rates, reliability, and reduced latency, particularly in supporting low latency and ultra-high reliability for real-time traffic.
Innovation Solution
A method and device utilizing a distributed resource unit tone plan in a wireless LAN system, where physical layer protocol data units are mapped onto distributed resource units defined as every 9th subcarrier within a 20 MHz channel, excluding direct current, null, and guard subcarriers, to enhance transmission and reception efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed resource units are used with every 9th subcarrier mapping, then bandwidth utilization efficiency is improved, but system complexity increases
Solution Approach 1:
The 20 MHz channel is divided into 9 distributed resource units, each utilizing every 9th subcarrier. This segmentation allows parallel transmission across the bandwidth while maintaining manageable complexity at each resource unit level.
Solution Approach 2:
The patent transitions from traditional contiguous frequency allocation to a distributed frequency pattern where subcarriers are selected at regular intervals (every 9th subcarrier). This dimensional change in resource allocation pattern improves bandwidth utilization while spreading signals across the spectrum.
2Productivity
If more subcarriers are utilized for data transmission, then transmission rate is improved, but error rate increases
Solution Approach 1:
Each of the 9 resource units uses a specific pattern of every 9th subcarrier, creating localized quality variations across the frequency spectrum. This allows different portions of the bandwidth to experience different channel conditions, improving overall reliability through diversity.
Solution Approach 2:
The patent changes the subcarrier selection parameter from contiguous allocation to distributed allocation with a period of 9. This parameter change enables better frequency diversity while maintaining high transmission rates by utilizing more subcarriers.
Data Source
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AI summary
Disclosed are a transmission or reception method and apparatus based on a distributed resource unit tone plan in a wireless LAN system. A method performed by a first STA in a wireless local area network (WLAN) system, according to one embodiment of the present disclosure, may comprise the steps of: generating a PPDU including one or more fields, wherein the one or more fields are mapped on one or more DRUs; and transmitting the PPDU to one or more second STAs on a bandwidth including a 20 MHz channel. On the basis of the one or more DRUs including a 26-tone DRU, the 26-tone DRU is one of nine predefined 26-tone DRUs, and an nth (n=1, 2, ... and 9) 26-tone DRU may be defined as every ninth subcarrier on the basis of the nth lowest subcarrier, including the nth lowest subcarrier from among available subcarriers in the 20 MHz channel.