Multi-Link Wireless Retransmission via Concurrent Feedback
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Solution Overview
Problem
In multi-link wireless communication, current block acknowledgment approaches waste transmission time and increase overheads because receivers cannot interrupt ongoing transmissions until the entire PPDU is sent, even if payload is not received.
Innovation Solution
An electronic device concurrently communicates using multiple links to transmit a PPDU and receive feedback, allowing for immediate remedial actions such as aborting or retransmitting MPDUs based on feedback, including block acknowledgments or HARQ NACKs, to optimize transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the receiver waits for the entire PPDU to be transmitted before sending block acknowledgment, then the transmission protocol is simple to implement, but transmission time is wasted and overhead increases
Solution Approach 1:
The receiver performs preliminary detection of the PPDU payload during the ongoing transmission and sends a block acknowledgment interrupting the transmission before the entire PPDU is sent. This preliminary action allows the system to detect transmission failures early and abort unnecessary transmissions, reducing wasted transmission time while maintaining protocol simplicity through standardized acknowledgment mechanisms.
2Ease of operation
If the receiver sends block acknowledgment only after the entire PPDU is transmitted, then the acknowledgment timing is straightforward, but transmission overhead increases
Solution Approach 1:
The receiver provides feedback by sending a block acknowledgment during the ongoing PPDU transmission as soon as payload detection failure is determined. This feedback mechanism enables the transmitter to immediately abort the transmission, reducing transmission overhead and energy consumption. The feedback timing is optimized to balance operational simplicity with efficiency, sending the acknowledgment at the precise moment when transmission abortion becomes necessary.
Data Source
AI summary
An electronic device (such as an access point) that performs a remedial action is described. This electronic device may transmit, using a first radio in the electronic device, a physical layer convergence protocol (PLCP) protocol data unit (PPDU) to a recipient electronic device on a first link between the electronic device and the recipient electronic device, where the PPDU includes a PPDU preamble and a set of media access control (MAC) protocol data units (MPDUs). Then, the electronic device may receive, using a second radio in the electronic device, feedback from the recipient electronic device on a second link between the electronic device and the recipient electronic device. Next, the electronic device may perform the remedial action based at least in part on the feedback. For example, the electronic device may abort the PPDU transmission and/or retransmit one or more of the set of MPDUs.