Multi-Link Wi-Fi Frame Exchange with AP-Assisted Synchronization
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Solution Overview
Problem
The synchronization issue between multiple links in non-AP multi-link devices (MLDs) in IEEE 802.11be or Wi-Fi 7 leads to resource occupation and complexity, particularly when non-AP STAs affiliated with a non-AP MLD are blind to frame exchanges with other non-AP STAs on different links.
Innovation Solution
A data transmission method and apparatus that includes transmitting first frame information with transmission mode details, allowing certain non-AP STAs to initiate frame exchanges, and utilizing AP assistance requests to recover medium synchronization or trigger uplink transmissions when synchronization is lost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple non-AP STAs operate on multiple links simultaneously, then throughput and reliability are improved, but medium synchronization is lost and resource occupation increases
Solution Approach 1:
The patent introduces an AP assistance mechanism as an intermediary to mediate between multiple non-AP STAs operating on different links. The AP receives assistance request information from non-AP STAs and coordinates frame exchanges, acting as a mediator that restores medium synchronization without requiring direct coordination between non-AP STAs. This resolves the synchronization problem while maintaining multi-link operation benefits.
2Productivity
If non-AP STAs exchange frames on different links, then resource utilization is improved, but blindness issue occurs and handling complexity increases
Solution Approach 1:
The AP serves as an intermediary that manages frame exchanges between non-AP STAs on different links. When a non-AP STA experiences blindness on one link, it sends assistance request information to the AP, which then coordinates the frame exchange. This eliminates the need for complex blind handling mechanisms at the non-AP STA while maintaining resource utilization across multiple links.
Solution Approach 2:
The non-AP STA autonomously detects when it needs assistance (when medium synchronization is lost or blindness occurs) and sends assistance request information to the AP without requiring complex coordination protocols. This self-service approach simplifies the overall system by allowing individual STAs to request help when needed rather than requiring continuous complex inter-STA coordination.
3Ease of operation
If transmission mode information is exchanged, then controlled frame exchanges are enabled, but information overhead increases
Solution Approach 1:
The transmission mode information is carried within existing frame structures (such as trigger frames or data frames) rather than requiring separate dedicated signaling channels. This multi-functional approach allows the same frame to serve both data transmission and transmission mode indication purposes, reducing information overhead while maintaining ease of frame exchange control.
Data Source
AI summary
A data transmission method, a data transmission apparatus, a multi-link device (MLD), and a storage medium are provided. In the method, a first frame comprising first transmission mode information is received by a first non-access point (non-AP) station (STA) affiliated with a non-AP multi-link device (MLD). The first transmission mode information is related to one of transmission modes of the non-AP MLD, and the transmission modes allow none or at least one of the first non-AP STA and a second non-AP STA affiliated with the non-AP MLD has a right to initiate a transmission opportunity (TXOP) for frame exchange.