26-Tone DRU Mapping for Efficient WLAN PPDU Transmission
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Solution Overview
Problem
Existing wireless LAN systems lack efficient methods for transmission and reception based on a distributed resource unit tone plan, particularly in advanced communication environments requiring high throughput, low latency, and ultra-high reliability.
Innovation Solution
A method involving the generation and transmission of physical layer protocol data units (PPDUs) with distributed resource units (DRUs) configured based on predefined candidate DRUs, utilizing a 26-tone DRU on a 20MHz channel, and the reception of these units by stations in a WLAN system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed resource units (DRUs) are configured based on predefined candidate DRUs with 26-tone structure on 20MHz channel, then transmission efficiency and spectral utilization are improved, but system complexity and configuration overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-defining nine candidate 26-tone DRU configurations before actual transmission. These candidate DRUs are prepared in advance with specific tone allocations and mappings, allowing the system to select from pre-optimized configurations rather than computing resource unit assignments in real-time, thus improving transmission efficiency while managing complexity through pre-computation
Solution Approach 2:
The patent employs parameter changes by varying the tone plan parameters of the 26-tone DRU across different candidate configurations. Each candidate DRU has different tone allocations, guard intervals, and resource element mappings. By changing these parameters based on channel conditions and traffic requirements, the system optimizes transmission efficiency for different scenarios without requiring complete reconfiguration
2Adaptability or versatility
If multiple predefined candidate DRUs are supported for selection, then adaptability to different channel conditions and traffic types is improved, but configuration management and signaling overhead increase
Solution Approach 1:
The patent applies segmentation by dividing the overall resource unit configuration into nine discrete candidate DRU options, each with specific tone plan characteristics. Instead of transmitting complete configuration data for adaptability, the system segments the configuration space into predefined indices, allowing selective reference to specific candidate DRUs based on channel conditions and traffic requirements, thereby reducing signaling overhead while maintaining adaptability
3Productivity
If 26-tone DRU configuration is used on 20MHz channel, then spectral efficiency is improved, but robustness against interference and fading decreases
Solution Approach 1:
The patent applies local quality by providing different 26-tone DRU candidate configurations optimized for different local channel conditions. Each candidate DRU has specific tone allocations and guard interval settings suited for particular interference and fading scenarios. The system selects the appropriate candidate DRU based on local channel characteristics, thereby achieving both spectral efficiency and robustness by matching the local quality of the transmission configuration to the local channel conditions
Data Source
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AI summary
Disclosed are a distributed resource unit tone plan-based transmission or reception method and apparatus 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. Here, on the basis of that the one or more DRUs include a 26-tone DRU, the 26-tone DRU may be one of nine 26-tone DRUs. At this time, an ith 26-tone DRU may be configured on the basis of a pre-defined jth candidate 26-tone DRU and information related to a BSS to which the first STA belongs.