PPDU Reception Across Aggregated Small RUs in 80 MHz WLAN
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing wireless LAN systems face challenges in efficiently utilizing increased spatial streams and bandwidth due to the need for improved signaling techniques, particularly in next-generation standards like IEEE 802.11be (EHT) that require enhanced PPDU structures and HARQ schemes.
Innovation Solution
A method and apparatus for transmitting and receiving PPDU through multiple RUs, specifically aggregating 26RU and 52RU in each 20 MHz subchannel, enabling efficient data transmission and reception in 80 MHz bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small-RUs (26RU and 52RU) are aggregated in each 20 MHz subchannel, then transmission efficiency and throughput are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The 80 MHz band is segmented into four 20 MHz subchannels, and each subchannel is further segmented into multiple small-RUs (26RU and 52RU). This segmentation allows flexible resource allocation and improves transmission efficiency by matching RU sizes to specific channel conditions and traffic requirements, while the modular structure helps manage complexity through standardized building blocks.
Solution Approach 2:
The patent introduces a new dimension of resource organization by aggregating small-RUs within each 20 MHz subchannel while maintaining the overall 80 MHz band structure. This multi-level hierarchical organization (80 MHz band → 20 MHz subchannels → small-RUs) enables fine-grained resource control without proportionally increasing system complexity, as the pattern repeats across subchannels.
2Productivity
If multiple RUs of various sizes are aggregated, then throughput is enhanced, but compatibility with existing standards becomes more difficult to maintain
Solution Approach 1:
The system dynamically selects and aggregates different RU sizes (26RU and 52RU) within each 20 MHz subchannel based on channel conditions, traffic requirements, and compatibility needs. This dynamic flexibility allows the system to optimize throughput when conditions permit while falling back to more compatible configurations when needed, maintaining adaptability across different operational scenarios.
Solution Approach 2:
The patent changes the parameter of RU size aggregation at the 20 MHz subchannel level rather than requiring uniform aggregation across the entire 80 MHz band. This localized parameter change allows individual subchannels to be configured with different RU aggregation patterns, enabling gradual adoption and maintaining compatibility with existing single-RU systems while achieving enhanced throughput through multi-RU aggregation where supported.
3Productivity
If 26RU and 52RU are aggregated in each 20 MHz subchannel, then data transmission efficiency is improved, but signaling technique complexity increases
Solution Approach 1:
The signaling complexity is segmented and localized to each 20 MHz subchannel level, where 26RU and 52RU aggregation is independently controlled. This segmentation allows the signaling overhead to be managed at a smaller scale per subchannel rather than requiring complex coordination across the entire 80 MHz band, reducing the overall signaling complexity while maintaining data transmission efficiency benefits.
Solution Approach 2:
The 20 MHz subchannel acts as an intermediary layer between the 80 MHz band-level resource allocation and the individual small-RU level. This intermediary structure simplifies signaling by providing a manageable intermediate granularity level, where aggregation decisions can be made without requiring direct coordination of all individual RUs across the full bandwidth, thus reducing signaling technique complexity.
Data Source
AI summary
Proposed are a method and a device for receiving a PPDU in a wireless LAN system. Specifically, a receiving STA receives a PPDU from a transmitting STA through a first band, and decodes the PPDU. The PPDU comprises a control field and a data field. When the first band is an 80 MHz band comprising first to fourth 20 MHz subchannels, the first 20 MHz subchannel comprises first multiple RUs in which a first 26RU and a first 52RU are aggregated. The first 26RU is an RU located in the middle of the first 20 MHz subchannel. The first 52RU is an RU having a frequency lower than that of the first 26RU, and which is adjacent to the first 26RU.