Duplicated PPDU Reception Across 80 MHz Bands for Longer WLAN Range
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Solution Overview
Problem
The existing wireless LAN systems face challenges in effectively utilizing increased spatial streams and transmission distances, particularly in the context of the next-generation IEEE 802.11be (EHT) standard, where improved signaling techniques are needed to enhance transmission reliability and range.
Innovation Solution
The proposed method involves duplicating data transmission across two 484-tone resource units in an 80 MHz band, with phase rotation applied to the second data, allowing for reliable performance over longer distances by dividing the band into two resource units and repeating the data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If data is transmitted over increased transmission distances in next-generation WLAN systems, then transmission range is extended, but signal reliability deteriorates
Solution Approach 1:
The 80 MHz band is divided into two separate 40 MHz bands, and data is transmitted in duplicate across both bands. This segmentation allows the receiving station to combine signals from both bands, improving reliability over extended distances while maintaining backward compatibility with existing WLAN standards.
Solution Approach 2:
The patent implements data duplication by transmitting the same data across two different 40 MHz bands within the 80 MHz spectrum. This copying approach ensures that if one band experiences signal degradation over distance, the other band provides a reliable backup, thereby extending effective transmission range while maintaining signal integrity.
2Productivity
If more spatial streams are used in next-generation WLAN systems, then throughput capacity increases, but signaling complexity increases
Solution Approach 1:
The patent employs a universal signaling mechanism that works across multiple spatial streams and bandwidth configurations. By using duplicate data transmission across bands with phase rotation, the same signaling approach can handle increased spatial streams without requiring separate complex signaling protocols for each stream, thereby maintaining manageable signaling complexity while scaling throughput capacity.
Data Source
Figure 1(a)~1(b)
Figure 2
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AI summary
A method and an apparatus for receiving a PPDU in a wireless LAN system are proposed. Specifically, a receiving STA receives the PPDU from a transmitting STA through an 80MHz band, and decodes the PPDU. The PPDU includes a preamble and a data field. The 80MHz band includes first and second 484 tones RUs. The data field includes first data for the first 484 tone RU and second data for the second 484 tone RU. The second data is data obtained by duplicating the first data. The first and second 484 tone RUs are resource units including 484 tones.