AP Multi-Link Retry Selection for Wi-Fi 7 Channel Utilization
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Solution Overview
Problem
Existing Wi-Fi technologies, particularly Wi-Fi 7 with multi-link operation (MLO), lack a tailored retry mechanism that can efficiently handle complex user scenarios, leading to improper retry modes and suboptimal performance in dense network environments.
Innovation Solution
An MLD level retry mechanism for Wi-Fi 7 devices that involves an access point (AP) determining trigger conditions, selecting an alternate link based on channel utilization, power save status, and frame retry rates, and choosing an appropriate retry mode based on RSSI, channel utilization, packet length, and historical retry data to transmit retry packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional retry mechanisms are used in Wi-Fi networks, then retry packets can be transmitted, but the air environment becomes busy and channel utilization decreases
Solution Approach 1:
The patent introduces a new dimension for retry transmission by utilizing multiple links (Link 1 and Link 2) instead of relying on a single link. When a retry is needed on one link, the system can switch to another link, effectively adding a spatial dimension to the retry mechanism. This resolves the contradiction by providing alternative transmission paths that reduce air interface congestion while maintaining retry reliability.
2Reliability
If multiple retry attempts are made on the same link, then transmission reliability improves, but channel occupation increases and network performance deteriorates
Solution Approach 1:
The patent extracts the retry transmission from the congested link and relocates it to an alternate link. Instead of repeatedly attempting retries on the same occupied channel, the system separates the retry function to a different link, reducing channel occupation time on the original link while maintaining transmission reliability through the alternative path.
3Productivity
If link switching is implemented for retry, then channel utilization improves, but device complexity increases
Solution Approach 1:
The patent implements a dynamic link selection mechanism where the system adaptively chooses between Link 1 and Link 2 based on current transmission needs and link availability. This dynamic approach allows the retry mechanism to flexibly switch links when needed, improving channel utilization by avoiding persistent congestion on a single link while managing complexity through conditional decision-making rather than permanent multi-link configuration.
Data Source
AI summary
In implementations of the present disclosure, a retry mechanism for access point multi-link device is provided. An access point (AP) multi-link device (MLD) detects a trigger condition for a retry on a first link. After detecting the trigger condition, the AP MLD further selects a second link from a plurality of links. The AP MLD then selects a retry mode from a plurality of retry modes for the second link, and transmits a retry packet on the second link using the selected retry mode. Implementations of the present disclosure can fully utilize the MLD properties to help speed up the transmissions of the retry frames, and can reduce the channel occupation and increase the channel utilization of the retry frames.