MLD BSS Load Report Management for Link Alternation
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Solution Overview
Problem
In wireless networking, Multi-Link Devices (MLDs) exhibit active link alternation due to repetitive selection of least-loaded links based on BSS load reports, leading to unbalanced traffic loads and increased latency.
Innovation Solution
Implementing BSS load report management methods such as halting out-of-link BSS load reports, modifying load values in unicast reports, performing selective unicast BSS load reporting, or disassociating MLD clients to mitigate active link alternation, thereby maintaining balanced traffic loads across links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MLD clients continuously select the least-loaded link based on BSS load reports, then link load balancing is improved, but active link alternation increases causing latency and instability
Solution Approach 1:
The AP MLD sends a BSS load report to the MLD client before the client needs to select a link, indicating which link will have the least load in the future. This allows the client to proactively switch to the recommended link before load imbalance occurs, preventing active link alternation while maintaining load balancing. The report is sent in advance so the client can act on the information without needing to continuously monitor and react to current load conditions.
Solution Approach 2:
The system implements a feedback mechanism where the AP MLD monitors link load conditions and sends BSS load reports to MLD clients to guide their link selection. This feedback loop allows the AP to control client behavior and prevent erratic link switching, as clients follow the AP's recommendations rather than independently making switching decisions based on their own observations.
2Productivity
If MLD clients frequently switch between links to maintain load balance, then traffic distribution is improved, but link stability deteriorates
Solution Approach 1:
The AP MLD provides feedback through BSS load reports that indicate the optimal link for the client to use. This feedback mechanism stabilizes link selection by having clients follow AP-directed recommendations rather than independently switching based on their own load observations, thereby maintaining both traffic distribution and link stability.
Solution Approach 2:
The AP MLD acts as an intermediary between the actual link load conditions and the MLD client's link selection decisions. Instead of clients directly observing and reacting to link loads, the AP mediates this information through controlled BSS load reports, smoothing out erratic switching behavior while maintaining effective load balancing.
Data Source
AI summary
Mitigation of active link alternation by multi-link devices (MLDs) may be provided. First, at least first and second links may be established between an Access Point (AP) MLD and an associated MLD client. The first link may be active, while the second link may be inactive. A set of traffic load data associated with the links may be collected before and after transmission of a Basic Service Set (BSS) load report to the MLD client. The report may include a traffic load on the second link prior to transmission, where the second link is less loaded than the first link. Based on the collected traffic load data, an active link alternation from the first to the second link by the MLD client responsive to receiving the report may be detected. One or more methods for BSS load report management may then be applied to mitigate future active link alternation.