ACK Transmission via Narrowband Link for Multilink WLAN Reliability
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Solution Overview
Problem
In wireless local area networks (WLANs), existing technologies face challenges in efficiently managing ACK delivery failures due to power imbalances across multiple links, leading to unreliable signal transmission and reception, especially in multilink environments where one link's transmission power may exceed the other's, causing misinterpretation of frame delivery success or failure.
Innovation Solution
A method where a STA confirms ACK delivery failures by reporting through a different link and adjusts transmission power by sending ACK signals in a narrowband through the initial link, allowing for efficient signal transmission and reception by distinguishing between successful frame reception and ACK transmission failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multilink transmission is used to improve transmission speed and capacity, then productivity is improved, but reliability deteriorates due to power imbalance between links causing ACK delivery failures
Solution Approach 1:
The patent segments the feedback mechanism by separating data transmission and ACK transmission onto different links. The first link continues to carry data frames, while the second link is dedicated to carrying ACK frames. This segmentation isolates the power imbalance issue on the data link from the feedback link, allowing reliable ACK delivery even when one link has higher transmission power than the other.
Solution Approach 2:
The patent introduces a second link as an intermediary channel for ACK transmission. Instead of using the same link for both data and ACK (which causes power imbalance issues), the second link acts as a mediator that reliably delivers ACK frames back to the transmitting station, ensuring feedback reliability independent of the power conditions on the first link.
2Reliability
If transmission power is increased to ensure reliable signal delivery, then reliability is improved, but harmful factors worsen due to power imbalance causing misinterpretation of frame delivery status
Solution Approach 1:
The patent segments the communication function into two separate links: the first link for data transmission and the second link for ACK transmission. This segmentation allows each link to operate with appropriate power levels independently, eliminating the harmful power imbalance effects that would occur if both functions used the same link.
Solution Approach 2:
The second link serves as an intermediary that carries ACK frames with controlled power levels. By using this dedicated feedback link, the transmitting station can reliably receive ACKs without interference from power imbalance issues that affect the data link, thus eliminating misinterpretation of frame delivery status.
3Device complexity
If ACK transmission uses the same link as data transmission, then device complexity is reduced, but reliability worsens due to inability to distinguish between frame delivery success and ACK transmission failure
Solution Approach 1:
The patent segments the transmission and feedback paths into separate links. The first link handles data frame transmission, while the second link handles ACK frame transmission. This segmentation provides clear separation of functions, making it unambiguous whether a frame was delivered successfully or if an ACK transmission failed, thereby improving reliability without significantly increasing device complexity.
Solution Approach 2:
The second link acts as an intermediary feedback channel that clearly distinguishes between successful data delivery (indicated by receiving an ACK on the second link) and transmission failures. This intermediary channel eliminates ambiguity in delivery status identification by providing a dedicated path for confirmation signals.
Data Source
AI summary
In a wireless local area network (LAN) system, a first station (STA) may check the transfer failure of a first acknowledgement (ACK) signal for a first frame, the signal being received through a first link. The first STA may transmit report information related to the transfer failure of the first ACK signal to a second STA through a second link. Here, the report information may include identification information associated with the first link. The first STA may receive a second frame from the second STA through the first link. The first STA may transmit a second ACK signal for the second frame to the second STA through the first link on a narrowband.