PPDU Preamble RU Signaling for Flexible WLAN Multiplexing
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Solution Overview
Problem
Existing WLAN systems face challenges in efficiently supporting low latency and ultra-fast wireless communication, particularly in crowded areas and outdoor environments, as they struggle to effectively allocate resource units (RUs) for multiple users using technologies like 802.11ax and 802.11be.
Innovation Solution
The implementation of a method and apparatus for allocating single or multi-RUs to wireless devices, utilizing an RU allocation subfield in the preamble of a PPDU, allowing for efficient RU allocation and multiplexing of devices, with a maximum of one multiplexed device per RU or multi-RU corresponding to less than 242 subcarriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple users are supported using OFDMA and MU-MIMO in 802.11ax/be standards, then the system capacity and throughput are improved, but the resource unit allocation complexity and latency increase
Solution Approach 1:
The patent segments the frequency spectrum into multiple resource units (RUs) of different sizes (26, 52, 106, 242 subcarriers), allowing flexible allocation to different users based on their requirements. This segmentation enables efficient multi-user support while maintaining manageable allocation complexity through standardized RU templates.
Solution Approach 2:
The patent implements dynamic RU allocation where the access point can flexibly assign different RU sizes and combinations to different users based on real-time channel conditions and traffic demands. The system dynamically adjusts the number of RUs, their sizes, and allocation patterns to optimize throughput while adapting to changing network conditions.
2Productivity
If resource units are allocated to multiple users in crowded areas, then the communication efficiency is improved, but the latency and resource management overhead increase
Solution Approach 1:
The patent establishes preliminary RU allocation patterns and signaling mechanisms in advance, where the access point pre-defines RU structures and allocation rules before actual data transmission. This preliminary setup enables rapid resource assignment during data transmission, reducing latency while maintaining efficient multi-user communication in crowded areas.
3Speed
If multi-RU allocation is implemented for ultra-fast transmission, then the data rate is improved, but the signaling overhead and allocation management complexity increase
Solution Approach 1:
The patent creates a universal RU allocation framework that handles both single-RU and multi-RU allocations using the same signaling structure. The RU allocation subfield in the preamble can universally represent different allocation patterns (single RU, contiguous multi-RU, non-contiguous multi-RU) through standardized encoding, reducing signaling overhead while supporting ultra-fast transmission through flexible multi-RU assignments.
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AI summary
Systems and methods for communicating are described. According to some embodiments, a first device, with at least one second device in a wireless local area network (WLAN) system may allocate at least one resource unit (RU) to the at least one second device and generate an RU allocation subfield defining the allocated at least one RU. In some examples, the allocation of the at least one RU includes allocating a single RU or a multi-RU to a second device and setting a maximum of one multiplexed second device in a single RU or a multi-RU corresponding to less than 242 subcarriers.