26-Tone DRU Allocation Across 80 MHz WLAN Subcarriers
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Solution Overview
Problem
Existing wireless LAN systems face challenges in providing advanced wireless communication environments with improved transmission rates, increased bandwidth, reduced latency, and enhanced reliability, 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 WLAN system, where a physical layer protocol data unit (PPDU) is mapped onto distributed resource units (DRUs) within an 80MHz channel, with 26-tone DRUs defined as every 36-th subcarrier excluding DC, null, and guard subcarriers, enabling efficient transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed resource units (DRUs) are used to map PPDU fields onto subcarriers in an 80MHz channel, then bandwidth utilization is improved and transmission rate is enhanced, but system complexity increases due to the need to manage 36 predefined 26-tone DRUs and exclude multiple types of subcarriers (DC, null, guard, pilot)
Solution Approach 1:
The 80MHz channel bandwidth is segmented into 36 predefined 26-tone distributed resource units (DRUs), each occupying specific non-contiguous subcarriers. This segmentation allows parallel transmission of multiple data streams across different frequency regions, improving overall transmission rate while distributing the complexity of resource management across standardized units.
Solution Approach 2:
Different types of subcarriers (DC, null, guard, pilot) are assigned specific local qualities or functions within the frequency spectrum. DC subcarriers are excluded from data transmission, null subcarriers provide guard bands, guard subcarriers separate DRUs, and pilot subcarriers enable channel estimation. This local differentiation optimizes each subcarrier's contribution while maintaining overall system performance.
2Reliability
If 26-tone DRUs are defined as every 36-th subcarrier excluding DC, null, and guard subcarriers, then reliability for real-time traffic is enhanced through efficient resource allocation, but the difficulty of detecting and measuring available subcarriers increases
Solution Approach 1:
The positions and characteristics of all subcarrier types (DC, null, guard, pilot) are predetermined and standardized in the DRU definition. The first station (AP) performs preliminary resource allocation by selecting from the 36 predefined 26-tone DRUs, and the second station (STA) uses the same predefined structure to detect and measure available subcarriers. This preliminary standardization reduces the difficulty of real-time detection while ensuring reliable resource allocation for real-time traffic.
3Reliability
If multiple subcarriers are excluded (23 DC, 42 null, 23 guard, and 72 pilot subcarriers) from the 1024 subcarriers in an 80MHz channel, then transmission reliability is improved through proper signal processing, but the quantity of available subcarriers for data transmission is reduced
Solution Approach 1:
The system changes the parameter of subcarrier utilization by organizing 1024 total subcarriers into a structured pattern where 26-tone DRUs are distributed across the spectrum. By defining DRUs as every 36-th subcarrier and systematically excluding specific subcarrier types (DC, null, guard, pilot), the system optimizes the ratio of usable to total subcarriers, achieving reliable transmission while maximizing available data-carrying subcarriers within the constrained structure.
Data Source
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AI summary
Disclosed are a transmission or reception method and device based on a distributed resource unit tone plan in a wireless LAN system. A method performed by a first station (STA) in a wireless local area network (WLAN) system, according to one 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 DRUs; and transmitting the PPDU to one or more second STAs on a bandwidth including an 80 MHz channel. On the basis of the one or more DRUs comprising a 26-tone DRU, the 26-tone DRU is one of 36 predetermined 26-tone DRUs, wherein the nth (n = 1, 2, ..., 18) 26-tone DRU may be defined as every 36th subcarrier including the nth lowest subcarrier among available subcarriers in the 20 MHz channel.