Distributed Resource Unit Tone Plan for WLAN Pilot Placement
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Solution Overview
Problem
Existing wireless LAN systems face challenges in improving transmission rates, reliability, and reducing latency, particularly in supporting advanced communication technologies like Extremely High Throughput (EHT) and ultra-high reliability (UHR), which require efficient utilization of multiple bands and spatial streams.
Innovation Solution
A method and device utilizing a distributed resource unit tone plan and pilot tone in a wireless LAN system, where a physical layer protocol data unit (PPDU) is mapped onto distributed resource units (DRUs) with predefined 26-tone configurations, specifically using the 7th lowest and 7th highest subcarriers for pilot tones within a 20MHz channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed resource unit tone plan with predefined 26-tone DRUs is used, then bandwidth utilization is improved, but system complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into multiple distributed resource units (DRUs), each comprising 26 predefined subcarriers. This segmentation allows independent allocation and transmission on different frequency segments, improving bandwidth utilization while maintaining manageable complexity through standardized DRU structures.
Solution Approach 2:
The patent changes the frequency domain parameters by distributing subcarriers non-contiguously across the spectrum rather than using contiguous allocations. The predefined 26-tone DRU structure with specific pilot tone positions (7th lowest and 7th highest subcarriers) standardizes parameter configurations, improving utilization while controlling complexity through parameter standardization.
2Measurement precision
If pilot tones are placed on 7th lowest and 7th highest subcarriers, then channel estimation accuracy is improved, but signal processing complexity increases
Solution Approach 1:
The patent applies local quality by placing pilot tones at specific locations (7th lowest and 7th highest subcarriers) within each DRU rather than uniformly distributing them. This localized placement optimizes channel estimation accuracy for the specific DRU structure while maintaining predictable processing complexity through consistent positioning rules.
3Productivity
If multiple 26-tone DRUs are allocated in 20MHz channel, then transmission rate is improved, but latency increases
Solution Approach 1:
The patent segments the 20MHz channel into multiple 26-tone DRUs that can be allocated to different users or streams simultaneously. This segmentation enables parallel transmission across multiple frequency segments, increasing overall transmission rate while the standardized small size of each DRU (26 subcarriers) allows for efficient processing that mitigates latency increases.
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 and a pilot tone in a wireless LAN system are disclosed. The 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 physical layer protocol data unit (PPDU) including one or more fields, the one or more fields mapping onto one or more distributed resource units (DRUs); and transmitting the PPDU to one or more second STAs on a bandwidth including a 20MHz 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. A pilot tone of each of the nine predefined 26-tone DRUs can be the seventh lowest subcarrier and the seventh highest subcarrier from among subcarriers included in one 26-tone DRU.