Wireless Mesh AP Coordination for R-TWT Low-Latency Service
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Solution Overview
Problem
Existing wireless mesh networks, such as EasyMesh networks, do not support the transmission of Restricted Target Wake Time (R-TWT) low latency service across the entire network, leading to inefficiencies and potential conflicts due to lack of synchronization and coordination among Access Points (APs).
Innovation Solution
Implementing a mechanism to synchronize R-TWT membership and parameters among APs within the network, enabling coordinated channel access during R-TWT Service Periods to prioritize low latency services, using methods like CSMA/CA, fair channel access, RU allocation, and RU autonomous coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If R-TWT mechanism is implemented in Wi-Fi 7 for low latency service, then transmission efficiency and latency performance are improved, but existing wireless mesh networks cannot support R-TWT transmission across the whole network due to lack of synchronization and coordination among APs
Solution Approach 1:
The patent segments the R-TWT service transmission into multiple coordinated parts across different APs. The serving AP that establishes R-TWT with the STA segments the transmission task by coordinating with other APs in the mesh network, allowing each AP to handle specific portions of the low latency service transmission during designated service periods, thereby enabling network-wide support while maintaining individual AP autonomy
Solution Approach 2:
The patent introduces an R-TWT coordination mechanism as an intermediary between the serving AP and other APs in the mesh network. This coordination system acts as a mediator that synchronizes R-TWT parameters, manages service periods, and coordinates channel access across multiple APs, enabling seamless R-TWT transmission across the entire network without direct STA involvement in the coordination process
2Quantity of substance
If multiple APs in wireless mesh network transmit data simultaneously, then network coverage and capacity are improved, but conflicts and interference occur without proper coordination during R-TWT service periods
Solution Approach 1:
The patent implements periodic R-TWT service periods during which coordinated channel access is enforced among multiple APs. These periodic service periods create structured transmission windows where APs follow synchronized access patterns, allowing high-capacity parallel transmission during active periods while ensuring reliability through coordinated access control that prevents conflicts during these critical low-latency service windows
Solution Approach 2:
The patent establishes a feedback mechanism where APs exchange R-TWT parameter information and coordination status with each other and with the serving AP. This feedback system allows APs to adjust their transmission behavior based on network conditions and coordination requirements, ensuring that high network capacity is maintained while preventing transmission conflicts through real-time information sharing and adaptive coordination
Data Source
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AI summary
The embodiments of the present disclosure relate to access point (AP) devices and methods for supporting an Restricted Target Wake Time (R-TWT) low-latency service in a wireless mesh network. A first AP device in the wireless mesh network sends a Restricted Target Wake Time (R-TWT) notification message to a second AP device in a wireless mesh network, where the R-TWT notification message at least indicates an R-TWT Service Period (SP) of a terminal having R-TWT membership with the first AP device. The first AP device performs, within the R-TWT SP of the terminal, coordinated channel access with the second AP device for transmission of a low latency service of the terminal.