Multi-Link Setup Link Recommendation for WLANs
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Solution Overview
Problem
In Wireless Local Area Networks (WLANs) with Multi-Link Operations (MLO) enabled, there is a potential for overloading or overutilizing a particular link when non-Access Point (non-AP) devices attempt to associate with an Access Point (AP) after an AP reboot, leading to increased latency and reduced throughput.
Innovation Solution
The proposed solution involves transmitting a Link ID information element (IE) with reserved bits used to indicate whether a link is recommended or not for association and multi-link setup procedures. This allows non-AP devices to associate with the AP over recommended links, thereby reducing the likelihood of overloading specific links.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-AP devices attempt to associate with an AP after an AP reboot using multi-link operations, then connection establishment is enabled, but link overloading occurs leading to increased latency and reduced throughput
Solution Approach 1:
The AP transmits link recommendation information to non-AP devices before they attempt association. This preliminary action guides devices to select appropriate links in advance, preventing overloading before it occurs and reducing association latency.
Solution Approach 2:
The link recommendation information acts as an intermediary mechanism between the AP and non-AP devices. It mediates the association process by providing guidance on link selection, thereby distributing traffic load and preventing congestion on any single link.
2Reliability
If non-AP devices attempt to associate with an AP after an AP reboot, then connection establishment is enabled, but link overloading occurs leading to reduced throughput
Solution Approach 1:
The AP transmits link recommendation information to non-AP devices before they attempt association. This preliminary action guides devices to select appropriate links in advance, preventing overloading before it occurs and reducing association latency.
Solution Approach 2:
The link recommendation information acts as an intermediary mechanism between the AP and non-AP devices. It mediates the association process by providing guidance on link selection, thereby distributing traffic load and preventing congestion on any single link.
3Ease of operation
If link recommendation information is transmitted using reserved bits in Link ID information element, then link selection guidance is provided, but protocol structure must be modified
Solution Approach 1:
The reserved bits in the Link ID information element are repurposed to carry link recommendation information. This multi-functional use of existing protocol fields provides link selection guidance without requiring additional message types or significant protocol structural changes.
Solution Approach 2:
The state of the reserved bits is changed to encode link recommendation information. By modifying the parameter values of existing fields rather than adding new fields, the protocol structure remains relatively simple while still providing operational guidance.
Data Source
AI summary
Systems and methods are provided for specifying a link recommendation. Such a link recommendation can recommend a particular multi-link operation (MLO) link between an access point (AP) multi-link device (AP MLD) and a non-AP MLD, such as a client device or station for use when exchanging data frames. Conventional usage of MLO can result in non-AP MLDs attempting to associate to a particular AP MLD over the same link, which can result in overloading of that link. This is because the implementation of MLO elevates the context of AP-client device/station association to a higher level, i.e., the device/MLD level, and the link on which data frames are sent or received between an AP MLD and a non-AP MLD s no longer a consideration/relevant. However, the transmission of link recommendations indicating links to use (or to avoid), avoids or lessens the risk that multiple non-AP MLDs attempting to associate to an AP MLD will overload or overuse the same link.