Multi-Link Synchronous Transmission via Backoff Timing
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Solution Overview
Problem
In multi-link communication scenarios, non-simultaneous transmit and receive (STR) multi-link devices face challenges in achieving synchronous transmission across multiple links, leading to interference and reduced transmission performance.
Innovation Solution
A method where one multi-link device sends a transmission frame on one link based on the backoff counter reaching zero and the sending moment of a transmission frame on another link, aligning the start and end times of frames across links for synchronous transmission, and using error recovery mechanisms to retransmit frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a non-STR MLD performs independent channel access on multiple links, then each link can be accessed independently, but transmission frames on different links cannot be synchronized, causing interference and reduced transmission performance
Solution Approach 1:
The transmit MLD uses feedback from the backoff counter status and TXOP establishment status on one link to control the transmission timing on another link. When the backoff counter reaches 0 and a TXOP is established on the second link, the transmit MLD schedules the first transmission frame on the first link to achieve synchronized transmission, thereby resolving the contradiction between independent channel access and frame synchronization.
Solution Approach 2:
The transmit MLD performs a backoff procedure on the first link in advance to contend for the channel. By the time the backoff counter reaches 0 and a TXOP is successfully established on the second link, the transmit MLD is already prepared to send the first transmission frame on the first link at the appropriate moment, ensuring synchronous transmission without interfering with the second link.
2Productivity
If transmission frames are sent simultaneously on multiple links, then throughput is improved, but interference between links occurs in non-STR scenarios
Solution Approach 1:
The transmit MLD uses periodic backoff procedures on the first link to control transmission timing. By scheduling the first transmission frame to be sent when the backoff counter reaches 0 and a TXOP is established on the second link, the system achieves coordinated periodic transmission across multiple links, maintaining high throughput while avoiding interference through synchronized timing.
3Reliability
If the transmit MLD waits for TXOP establishment on one link before accessing another link, then frame synchronization is achieved, but channel access efficiency may be reduced
Solution Approach 1:
The transmit MLD performs the backoff procedure on the first link in advance, so that by the time a TXOP is established on the second link, the transmit MLD is already ready to send the first transmission frame on the first link. This preliminary action ensures that synchronization is achieved without excessive delay, as the backoff counter reaching 0 naturally indicates the appropriate transmission moment.
Data Source
AI summary
Embodiments of this application provides a multi-link synchronous transmission method and apparatus. The method includes: The transmit MLD sends a first transmission frame to the receive MLD at a first moment on the first link when a first condition is met. The first moment is determined based on a second moment and/or a third moment, the second moment is a moment at which a backoff counter of the first link decreases to 0, and the third moment is a sending moment of a second transmission frame on the second link. The first condition includes: (1) The backoff counter of the first link is 0, and (2) the second transmission frame is located in a transmission opportunity TXOP on the second link.