Multi-Link PPDU Retransmission Timing for Non-STR Error Recovery
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Solution Overview
Problem
Non-simultaneous transmitting and receiving (STR) multi-link devices (MLDs) face challenges in effectively recovering from link errors during communication, which affects throughput and efficiency.
Innovation Solution
A method for link error recovery in non-STR MLDs involves transmitting a second physical protocol data unit (PPDU) on a first link at an optimized moment, considering transmission status information of a second link, to synchronize and expedite error recovery, reducing waiting time and increasing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the transmitter MLD transmits the second PPDU at the moment for transmitting a next PPDU on the first link (earlier recovery), then link recovery is implemented earlier and throughput is increased, but the waiting time for retransmission must be reduced which may cause timing conflicts with the second link transmission
Solution Approach 1:
The transmitter MLD determines transmission status information of the second link in advance before transmitting the second PPDU for retransmission. By obtaining the status information of the second link prior to making the retransmission decision, the system can proactively plan the timing of error recovery without causing conflicts, thus achieving earlier link recovery while maintaining proper timing coordination
Solution Approach 2:
The patent dynamically adjusts the transmission timing of the second PPDU based on the real-time status information of the second link. The transmitter MLD flexibly determines whether to transmit the second PPDU at the originally scheduled moment or at an optimized moment, allowing the system to adapt to different transmission scenarios and maximize throughput while avoiding timing conflicts
2Reliability
If the transmitter MLD waits for transmission status information of the second link before transmitting the second PPDU, then timing conflicts are avoided and multi-link coordination is improved, but the recovery time is extended
Solution Approach 1:
The transmitter MLD obtains transmission status information of the second link in advance, before the retransmission decision needs to be made. This preliminary action allows the system to have the status information ready when needed, avoiding both the conflict of waiting too long and the rush of acting too early, thus achieving a balance between coordination reliability and recovery speed
Data Source
AI summary
A link error recovery method applied to a transmitter MLD is provided. Links between the transmitter MLD and a receiver MLD include a first link and a second link, and one of the transmitter MLD and the receiver MLD has an STR capability while the other does not have the STR capability. The method includes: determining that transmission of a first PPDU on the first link fails; and transmitting a second PPDU to the receiver MLD at a first moment by using the first link, the second PPDU being used to retransmit an error part in the first PPDU. The first moment is a moment at which the transmitter MLD obtains transmission status information of the second link. Alternatively, the first moment is a moment for transmitting a next PPDU on the first link if the first PPDU is normally transmitted.