26-Tone Distributed Resource Units for 40 MHz WLAN PPDU Mapping
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Solution Overview
Problem
Existing wireless LAN systems lack efficient methods for improving transmission rates, bandwidth utilization, and reducing latency and error rates, particularly in advanced communication environments requiring low latency and ultra-high reliability.
Innovation Solution
Implementing a distributed resource unit tone plan in the wireless LAN system, utilizing 26-tone distributed resource units (DRUs) defined as every 18th subcarrier within a 20MHz channel, for transmitting and receiving physical layer protocol data units (PPDUs) over a 40MHz channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional resource unit allocation is used in wireless LAN systems, then system compatibility is maintained, but transmission rates and bandwidth utilization cannot be sufficiently improved
Solution Approach 1:
The patent segments the frequency spectrum into distributed resource units (DRUs) where each DRU consists of non-contiguous subcarriers distributed across the available bandwidth. This segmentation allows multiple DRUs to be allocated to different stations simultaneously, improving both transmission rates through parallel data streams and bandwidth utilization through efficient spectrum distribution.
Solution Approach 2:
The patent transitions from traditional contiguous frequency allocation to a distributed frequency allocation scheme where resource units are distributed across multiple frequency dimensions. This dimensional change enables more flexible resource allocation, allowing the system to achieve higher transmission rates by utilizing frequency diversity and improving bandwidth efficiency through non-contiguous subcarrier distribution.
2Productivity
If advanced modulation and coding schemes are implemented, then transmission rates improve, but latency and error rates increase
Solution Approach 1:
The patent changes the fundamental parameter of frequency allocation from contiguous to distributed non-contiguous subcarrier assignment. This parameter change enables the system to achieve frequency diversity gain, where data is transmitted across multiple distributed frequency resources. The diversity provides inherent error protection against frequency-selective fading, allowing the use of advanced modulation and coding schemes with reduced error rates and latency.
3Ease of operation
If contiguous resource units are allocated for data transmission, then simple mapping is achieved, but bandwidth utilization and transmission efficiency are limited
Solution Approach 1:
The patent segments the available spectrum into multiple distributed resource units that can be independently allocated to different stations. Each DRU contains non-contiguous subcarriers distributed across the frequency spectrum, enabling efficient multi-user multiplexing. This segmentation approach improves bandwidth utilization by allowing simultaneous transmissions on multiple distributed frequency resources while maintaining manageable mapping complexity through standardized allocation rules.
Solution Approach 2:
The patent creates a universal distributed resource unit structure that can be applied across different bandwidth configurations and modulation schemes. The DRU framework provides a multi-functional resource allocation mechanism that works for various transmission scenarios, including single-user and multi-user transmissions, different modulation orders, and various coding rates, thereby improving overall bandwidth utilization while maintaining operational simplicity.
Data Source
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AI summary
A method and a device for transmission or reception based on a distributed resource unit tone plan in a wireless LAN system are disclosed. 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 transmitting the PPDU to one or more second STAs on a bandwidth including a 40 MHz channel. On the basis that the one or more DRUs include a 26-tone DRU, the 26-tone DRU may be one of 18 predefined 26-tone DRUs, and an nth (n=1, 2, ..., 18) 26-tone DRU may be defined as every 18th subcarrier including an nth lowest subcarrier among available subcarriers within a 20 MHz channel.