Multi-Link A-MPDU Quick Recovery for Low-Latency Retransmission
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Solution Overview
Problem
Existing multi-link wireless communication systems do not efficiently utilize retransmission of failed MPDUs in A-MPDUs due to latency in updating scoreboard contexts, especially in multi-link operation, leading to inefficient use of additional links for retransmission.
Innovation Solution
Implementing a Quick Recovery (QR) mode that allows simultaneous transmission of A-MPDUs and retransmission of failed MPDUs on separate links, with dynamic activation and termination of QR mode as needed, using new frames and modified frames for signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If simultaneous transmission of A-MPDU and retransmission of failed MPDUs is enabled on different links, then retransmission latency is reduced and transmission efficiency is improved, but device complexity increases due to the need for multi-link coordination and quick recovery mode management
Solution Approach 1:
The patent segments the transmission process by separating the A-MPDU transmission on a first link from the retransmission of failed MPDUs on a second link. This allows independent processing and transmission of data packets across different links, enabling simultaneous operations and reducing retransmission latency without requiring complete coordination of the entire data stream.
Solution Approach 2:
The patent introduces dynamic activation and termination of Quick Recovery (QR) mode based on network conditions. The system can switch between QR mode and traditional transmission modes flexibly, allowing the device to adapt to changing network environments and optimize performance while managing complexity through conditional operation rather than always-on complex coordination.
2Productivity
If Quick Recovery mode is dynamically activated and terminated based on network conditions, then transmission efficiency is optimized, but control complexity increases due to the need for continuous network condition monitoring and mode switching
Solution Approach 1:
The patent implements feedback mechanisms where the receiver notifies the transmitter about failed MPDUs during ongoing A-MPDU transmission. This feedback loop enables the system to monitor transmission success and dynamically adjust modes based on actual network conditions, optimizing transmission efficiency through data-driven decision making.
Solution Approach 2:
The system prepares for potential retransmissions by enabling QR mode in advance when network conditions suggest potential failures. This preliminary preparation allows the system to respond quickly to transmission issues without requiring complex real-time analysis, reducing control complexity by pre-positioning resources rather than reacting to each individual failure.
Data Source
AI summary
Methods and apparatuses for facilitating, in multi-link devices (MLDs) that are capable of exchanging an Aggregated MAC Protocol Data Unit (A-MPDU), simultaneous transmission of the A-MPDU and retransmission of failed MPDUs of the A-MPDU. A non-access point (AP) MLD comprises STAs, each comprising a transceiver configured to form a link with a corresponding AP of an AP MLD, and a processor. A first transceiver is configured to receive, from the AP MLD on a first of the links, an A-MPDU comprised of multiple MPDUs. the processor is configured to detect, during reception of the A-MPDU, that at least one of the MPDUs has not been received. A second transceiver is configured to transmit, to the AP MLD on a second of the links, a request to retransmit the at least one MPDU on the second link before reception of the A-MPDU on the first link is complete.