Roaming AP MLD Handshake for Seamless Non-AP Device Transition
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Solution Overview
Problem
Existing technologies face challenges in ensuring seamless smooth roaming for non-access point (non-AP) devices across multiple access point multi-link devices (AP MLDs) in ultra-high reliability (UHR) wireless communication systems, leading to increased association requirements and potential disruptions.
Innovation Solution
A method for smooth roaming involves exchanging management frames between a non-AP device and a current serving AP MLD to select a future serving AP MLD, allowing for seamless transition without the need for reassociation, utilizing link reconfiguration request and response frames to manage the handover process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional roaming methods are used between AP MLDs, then devices can move between access points, but reassociation is required which causes disruptions and increases complexity
Solution Approach 1:
The patent merges multiple AP MLDs into a single roaming AP MLD entity that shares a common MAC address. This allows the non-AP MLD to maintain a single association with the roaming AP MLD while seamlessly transitioning between individual AP MLDs, eliminating the need for reassociation and reducing operational complexity.
Solution Approach 2:
The roaming AP MLD acts as an intermediary between the non-AP MLD and multiple distributed AP MLDs. It manages the associations and transitions, absorbing the complexity of roaming management while presenting a simplified interface to the non-AP MLD, thus resolving the contradiction between roaming smoothness and association complexity.
2Reliability
If reassociation is required during roaming, then devices can transition between AP MLDs, but service disruptions occur and reliability decreases
Solution Approach 1:
The non-AP MLD performs preliminary actions by discovering and identifying candidate AP MLDs before actual roaming is needed. The roaming AP MLD pre-establishes the necessary associations and prepares for seamless transitions, eliminating service disruptions during actual roaming events and improving reliability.
Solution Approach 2:
The patent ensures continuous association between the non-AP MLD and the roaming AP MLD throughout the roaming process. By maintaining this continuous association while transitioning between AP MLDs, the system eliminates interruptions and service disruptions, thereby improving roaming reliability and reducing time loss.
3Area of stationary object
If multiple associations are maintained for roaming AP MLDs, then coverage area is extended, but the number of associations increases and management becomes complex
Solution Approach 1:
The roaming AP MLD serves multiple functions simultaneously - it acts as a single association point for the non-AP MLD while also managing connections to multiple distributed AP MLDs. This multi-functionality allows extended coverage area while maintaining a single association, reducing the number of associations needed and simplifying management.
Data Source
AI summary
Roaming for a non-access point (non-AP) device with a roaming access point (AP) multi-link device (MLD), wherein the roaming AP MLD includes a plurality of AP MLDs in different devices at different locations having one medium access control (MAC) service access point (SAP), including: exchanging management frames between the non-AP device and a current serving AP MLD that is one of the plurality of AP MLDs to select a future serving AP MLD that is one of the plurality of AP MLDs and to select future serving link of the future serving AP MLD; and exchanging management frames between the non-AP device and the serving AP MLD to switch from the current serving AP MLD and the future serving AP MLD.