METHOD OF TRIGGERING COORDINATED SPATIAL REUSE OR COORDINATED BEAMFORMING IN WI-FI COMMUNICATIONS

Smart overview of the Invention

The patent application introduces methods for enhancing Wi-Fi communications through coordinated beamforming and spatial reuse. A trigger frame is utilized to manage the allocation of spatial streams among access points (APs) and stations, facilitating the transmission and reception of physical layer protocol data units. This approach aims to improve the efficiency and coordination of multiple APs operating on the same channel.

Background

Traditional Wi-Fi networks required APs to access the medium one at a time. The sixth generation of Wi-Fi introduced the ability for multiple stations to transmit simultaneously using orthogonal frequency division multiple access (OFDMA). However, only one AP could transmit at a time. The eighth generation aims to enable multi-AP coordination, allowing multiple APs to use a channel simultaneously through coordinated spatial reuse (Co-SR) and coordinated beamforming (Co-BF).

Methodology

When an AP wins a transmission opportunity (TXOP), it can initiate multi-AP coordination with another AP. The TXOP winner becomes the 'Sharing AP', while the other AP is the 'Shared AP'. The coordination involves exchanging control information, such as the number of spatial streams scheduled across coordinated APs. Existing trigger frames lack the necessary control information for enabling Co-BF or Co-SR between multiple APs.

Trigger Frame Design

The proposed trigger frame includes Co-BF/Co-SR scheduling information, such as address information, spatial stream allocations, and cumulative transmission details. It can be configured with a User Info List or a common info field to provide detailed scheduling information. Different trigger frame formats are suggested to accommodate various coordination scenarios, ensuring efficient communication between APs and stations.

Implementation and Benefits

The new trigger frames facilitate simultaneous or sequential block acknowledgments from stations associated with coordinated APs. They also allow for flexible scheduling of spatial streams, optimizing the performance of multi-AP coordination. By addressing the limitations of existing protocols, the methods outlined in the application aim to enhance the efficiency and coordination of Wi-Fi networks, particularly in environments with overlapping service sets.