Wireless LAN PPDU RU Allocation for Discontiguous Subcarriers
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 a 160MHz frequency bandwidth using resource units (RUs) that include discontiguous subcarriers, with their locations indicated in an ascending order based on the lowest subcarrier, and processing these RUs at the receiving station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RUs include discontiguous subcarriers, then transmission power and throughput are improved, but signaling overhead for RU allocation increases
Solution Approach 1:
The 160MHz frequency bandwidth is segmented into multiple RUs with discontiguous subcarriers, allowing flexible resource allocation. The RU allocation subfield is further segmented into multiple parts, each indicating the location of a specific RU, enabling precise control of resource distribution while reducing the total number of bits required compared to indicating all subcarriers individually.
Solution Approach 2:
The patent changes the parameter representation from indicating all subcarrier positions to indicating only the starting positions and sizes of RUs. This parameter transformation reduces the signaling overhead while maintaining the ability to represent discontiguous subcarrier allocations, directly resolving the contradiction between detailed resource control and signaling efficiency.
2Area of stationary object
If RUs include discontiguous subcarriers, then transmission power and coverage are improved, but device complexity increases
Solution Approach 1:
The patent transforms the complex representation of discontiguous subcarrier positions into simplified parameters (starting position and size of each RU). This parameter simplification reduces device complexity while maintaining the ability to allocate and identify discontiguous RUs, enabling improved coverage without proportional increases in system complexity.
3Productivity
If RU allocation is indicated in ascending order based on lowest subcarrier, then resource allocation efficiency is improved, but flexibility in representing discontiguous subcarriers decreases
Solution Approach 1:
The patent segments the frequency bandwidth into multiple RUs that can be independently allocated and indicated in ascending order. This segmentation allows the system to maintain a simple sequential indication method while still representing complex discontiguous subcarrier arrangements, as each RU's position and size are independently specified.
Solution Approach 2:
The patent introduces a parameter transformation that encodes discontiguous subcarrier positions as sequential RU allocations with starting positions and sizes. This transformation maintains the efficiency of ordered indication while preserving the flexibility to represent any discontiguous subcarrier pattern, as each RU can start at any valid subcarrier position.
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A method and a device for transmitting/receiving a PPDU in a wireless LAN system are disclosed. The method, performed by a first STA, according to an embodiment of the present disclosure may comprise the steps of: generating a physical protocol data unit (PPDU) to be transmitted within a frequency bandwidth of 160MHz; and transmitting the PPDU to a second STA.