Wireless LAN PPDU Allocation for Punctured 80 MHz Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless LAN technologies face challenges in improving transmission rates, reliability, and reducing latency, particularly in supporting low latency and ultra-high reliability (UHR) with efficient utilization of multiple bands and spatial streams.
Innovation Solution
The method involves generating and transmitting a PPDU within an 80MHz frequency bandwidth with 20MHz puncturing, using resource units (RUs) composed of discontinuous subcarriers, and indicating their locations through an RU allocation subfield in an ascending order based on the lowest subcarrier in the frequency domain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If RUs are allocated using traditional continuous subcarrier methods, then signaling overhead for RU allocation is reduced, but frequency resource use efficiency deteriorates when puncturing is applied
Solution Approach 1:
The patent segments the frequency spectrum into discrete resource units (RUs) with specific subcarrier allocations. By defining multiple RU types (first type with discontinuous subcarriers, second type with continuous subcarriers), the system can segment punctured bandwidths into usable portions, improving frequency resource utilization without requiring complex signaling for each punctured segment.
Solution Approach 2:
The patent changes the subcarrier allocation parameter from traditional continuous allocation to discontinuous subcarrier allocation for certain RUs. This parameter change allows RUs to be efficiently allocated in punctured bandwidths by skipping punctured subcarriers, thereby improving frequency resource use efficiency while maintaining simple RU allocation signaling.
2Productivity
If discontinuous subcarriers are used in RUs, then frequency resource use efficiency is improved in punctured bandwidths, but device complexity increases
Solution Approach 1:
The patent applies different subcarrier allocation qualities to different RUs based on their location and purpose. First type RUs use discontinuous subcarriers optimized for punctured bandwidths, while second type RUs use continuous subcarriers for non-punctured portions. This local differentiation improves overall frequency efficiency without requiring the entire system to handle complex discontinuous allocations.
Solution Approach 2:
Instead of allocating continuous subcarriers and excluding punctured portions (traditional approach), the patent inverts the approach by explicitly designing RU structures that incorporate discontinuous subcarrier patterns to match punctured bandwidths. This inversion simplifies the allocation process in punctured scenarios while maintaining efficiency.
3Device complexity
If traditional RU allocation methods are used, then device complexity is reduced, but transmission throughput decreases in punctured bandwidths
Solution Approach 1:
The patent performs preliminary allocation of first type RUs with discontinuous subcarriers in punctured bandwidths before allocating second type RUs. By pre-defining RU types and their subcarrier patterns, the system prepares the allocation structure in advance, enabling efficient throughput in punctured bandwidths without requiring complex real-time allocation decisions.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Disclosed are a method and device for PPDU transmission and reception in a wireless LAN system. The method performed by a first STA according to an embodiment of the present disclosure may comprise the steps of: generating a PPDU to be transmitted within an 80 MHz frequency bandwidth to which 20 MHz puncturing has been applied; and transmitting the PPDU to a second STA.