Distributed RU Tone Plan Across 40 MHz WLAN Channels
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Solution Overview
Problem
Existing WLAN systems face challenges in providing advanced wireless communication environments with improved throughput, 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 WLAN system, where physical layer protocol data units (PPDUs) are mapped onto distributed resource units (DRUs) across multiple 20 MHz channels, defining 26-tone DRUs within available subcarriers excluding direct current, null, and guard subcarriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distributed resource units are used across multiple 20 MHz channels, then bandwidth utilization and transmission reliability are improved, but system complexity and resource allocation overhead increase
Solution Approach 1:
The 40 MHz channel is segmented into multiple 20 MHz sub-channels, each carrying independent 26-tone DRUs. This segmentation allows parallel transmission across frequency divisions, improving reliability through frequency diversity while maintaining manageable complexity through standardized sub-channel processing
Solution Approach 2:
The patent distributes resource units across the frequency dimension by allocating 26-tone DRUs to specific subcarrier ranges within each 20 MHz channel. This frequency-domain distribution enables simultaneous transmissions on multiple frequency carriers, enhancing reliability without requiring temporal coordination
2Reliability
If 26-tone DRUs are defined as every ninth subcarrier across 40 MHz bandwidth, then frequency diversity and anti-interference capability are improved, but spectral efficiency and resource utilization density decrease
Solution Approach 1:
Different 26-tone DRUs are allocated to different frequency locations with specific subcarrier spacing patterns. Each DRU experiences different channel conditions and interference environments, allowing the system to exploit local frequency diversity while maintaining overall spectral efficiency through selective allocation
Solution Approach 2:
The patent defines DRU parameters including subcarrier index ranges and tone spacing to optimize the balance between frequency diversity and spectral efficiency. By adjusting the starting subcarrier indices and allocating specific tone ranges, the system adapts to different channel conditions while maintaining efficient resource utilization
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 means of 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 PPDU including one or more fields, the one or more fields being mapped onto one or more DRUs; and transmitting the PPDU to one or more second STAs on a bandwidth including a first 20 MHz channel and a second 20 MHz channel. On the basis of the one or more DRUs including a 26-tone DRU, the 26-tone DRU can be one of nine predefined 26-tone DRUs, and, for each of the first 20MHz channel and the second 20MHz channel, an nth (n=1, 2,..., 9) 26-tone DRU can be defined as every ninth subcarrier within each of one or more ranges, including the nth lowest subcarrier from among available subcarriers.