WLAN Distributed Resource Unit Tone Plan for Punctured 80 MHz Channels
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Solution Overview
Problem
Existing WLAN 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, where a physical layer protocol data unit (PPDU) is transmitted or received based on preamble puncturing across multiple 20MHz channels within an 80MHz channel, employing 26-tone distributed resource units (DRUs) defined as every 27th subcarrier in a 60MHz channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional resource unit allocation is used in WLAN systems, then system compatibility is maintained, but transmission rates and bandwidth utilization cannot be sufficiently improved
Solution Approach 1:
The 80MHz channel is segmented into multiple 20MHz sub-channels, and each sub-channel is further segmented into multiple distributed resource units (DRUs). This segmentation allows flexible allocation of frequency resources, enabling higher transmission rates by efficiently utilizing available bandwidth while maintaining system compatibility through standardized segment sizes.
Solution Approach 2:
Different resource unit configurations are applied to different frequency sub-bands within the 80MHz channel. Each 20MHz sub-channel can have its own DRU allocation pattern, allowing local optimization of transmission parameters based on channel conditions, thereby improving overall bandwidth utilization without requiring complete system redesign.
2Productivity
If bandwidth is increased to improve transmission rates, then productivity improves, but latency and reliability for real-time traffic deteriorate
Solution Approach 1:
The wide 80MHz channel is divided into multiple smaller 20MHz sub-channels that can be independently allocated to different traffic types. Real-time traffic can be assigned to specific sub-channels with guaranteed quality of service, while other sub-channels handle best-effort traffic, thus maintaining reliability for time-sensitive applications while utilizing the full bandwidth for overall productivity.
Solution Approach 2:
Different quality of service parameters and allocation strategies are applied to different frequency sub-bands. Critical real-time traffic receives prioritized allocation in specific sub-channels with protected resource units, while non-critical traffic utilizes remaining capacity, enabling simultaneous optimization of both bandwidth utilization and real-time traffic reliability.
3Productivity
If contiguous resource units are used for transmission, then spectral efficiency is improved, but vulnerability to frequency-selective fading increases
Solution Approach 1:
Resource units are segmented and distributed across non-contiguous frequency subcarriers within each 20MHz sub-channel. This distribution spreads the transmitted signal across multiple frequency locations, providing frequency diversity that protects against frequency-selective fading while maintaining efficient spectral utilization through structured subcarrier allocation.
Solution Approach 2:
Different distribution patterns are applied to different resource units within the frequency spectrum. Each DRU can have its subcarriers distributed according to local channel conditions, allowing optimization of both spectral efficiency and resistance to frequency selectivity in different frequency regions simultaneously.
Data Source
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AI summary
Disclosed are a distributed resource unit tone plan-based transmission or reception method and device in a wireless LAN system. A method performed by a first station (STA) in a wireless local area network (WLAN) system according to an embodiment of the present disclosure may comprise the steps of: generating a physical layer protocol data unit (PPDU) including one or more fields, wherein the one or more fields are mapped onto one or more distributed resource units (DRUs); and on the basis that preamble puncturing on one 20 MHz channel among four 20 MHz channels of a bandwidth including an 80 MHz channel is applied, transmitting the PPDU to one or more second STAs on a 60 MHz channel remaining after excluding the one 20 MHz channel. On the basis that the one or more DRUs include a 26-tone DRU, the 26-tone DRU is one of 27 predefined 26-tone DRUs, and an n-th (n=1, 2, ..., 27) 26-tone DRU may be defined as every 27th subcarrier including an n-th lowest subcarrier among available subcarriers within the 60 MHz channel.