Link Level Roaming in Seamless Mobility Domain
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Solution Overview
Problem
Existing Wi-Fi networks face challenges with interference and inefficient roaming due to multiple access points operating on the same radio frequency, leading to degraded network performance and increased latency, especially in dense deployments.
Innovation Solution
Implementing multi-link operation (MLO) and seamless mobility domains (SMD) to enable precise network-triggered roaming by enhancing the Link Reconfiguration Notify frame to support link reconfiguration across multiple access point multi-link devices (AP MLDs), allowing devices to seamlessly transition between APs within a campus-wide network without reassociation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple access points operate on the same radio frequency to provide wide coverage, then network coverage area is improved, but interference between access points increases and network performance deteriorates
Solution Approach 1:
The patent transitions from single-link operation to multi-link operation, adding a dimensional aspect to Wi-Fi communication. By establishing multiple independent communication links between AP MLDs and non-AP MLDs, the system operates in a multi-dimensional space where each link can be independently managed, thereby reducing interference while maintaining wide coverage.
Solution Approach 2:
The patent segments the wireless communication into multiple independent links, each operating on potentially different radio frequencies or channels. By dividing the communication pathway into separate links (link 1, link 2, link 3, etc.), the system can manage interference independently on each link and perform precise roaming without affecting all connections simultaneously.
2Adaptability or versatility
If traditional roaming mechanisms are used between access points, then device mobility is supported, but roaming time increases and network latency is degraded
Solution Approach 1:
The patent implements preliminary action by pre-establishing multiple links between the non-AP MLD and different AP MLDs before roaming is needed. When roaming is triggered, the system can immediately switch to a pre-configured link with a target AP MLD, eliminating the need for time-consuming reassociation procedures and reducing roaming latency.
Solution Approach 2:
The non-AP MLD is configured with universal connectivity across multiple AP MLDs through multi-link operation. Instead of being tied to a single access point, the device can operate on multiple links simultaneously, allowing seamless transition between APs without breaking connectivity, thus supporting device mobility with minimal interruption.
3Measurement precision
If link reconfiguration is performed across multiple AP MLDs, then roaming precision is improved and latency is reduced, but frame complexity and signaling overhead increase
Solution Approach 1:
The patent merges multiple link reconfiguration operations into a single unified BSS Transition Management frame. Instead of sending separate frames for each link, the system combines all link reconfiguration elements (add link, delete link, modify link operations) into one frame, reducing signaling overhead while maintaining precise roaming control across multiple links.
Data Source
AI summary
In one aspect, a computer-implemented method includes generating, by a first access point multi-link device (AP MLD), a frame including at least one multi-link reconfiguration element, and sending, by the first AP MLD, the frame to a non-AP MLD to perform a link level roaming. The at least one multi-link reconfiguration element includes at least one delete link operation and at least one add link operation based on which the non-AP MLD performs the link level roaming between the first AP MLD and a second AP MLD of a seamless mobility domain.