Logical AP MLD Roaming for Seamless BSS Transition Continuity
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Solution Overview
Problem
Existing wireless communication systems face challenges in maintaining data continuity during Basic Service Set (BSS) transitions, particularly when a station (STA) moves and disconnects from one access point (AP) to another, leading to prolonged connectivity loss between the STA and the Distribution System (DS) or between a non-AP MLD and the DS.
Innovation Solution
A wireless communication method and device that enables a non-AP MLD to transition between affiliated AP MLDs, utilizing a logical AP MLD architecture to maintain data continuity by controlling communication transitions and switches between AP MLDs, ensuring seamless roaming and data persistence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a STA moves and disconnects from one AP to another, then the STA can roam between different access points, but connectivity loss between the STA and the Distribution System is prolonged
Solution Approach 1:
The patent applies preliminary action by establishing a target AP MLD before the STA actually transitions. The target AP MLD is prepared in advance with the necessary context information, allowing the STA to switch connections quickly without interruption. The target AP MLD receives and processes the first frame before the transition is complete, reducing connectivity loss duration while maintaining roaming capability.
2Adaptability or versatility
If multiple links are established between AP MLD and non-AP MLD over multiple frequency bands, then network flexibility and scalability are improved, but transition time between APs increases
Solution Approach 1:
The patent segments the AP MLD into multiple independent AP MLDs that can operate simultaneously on different frequency bands. Each AP MLD can handle transitions independently, allowing the STA to switch between them without affecting other links. This segmentation enables parallel processing of transition operations across multiple frequency bands, reducing overall transition time while maintaining multi-link operation flexibility.
Solution Approach 2:
The patent introduces a logical AP MLD as an intermediary that coordinates transitions between different AP MLDs. The logical AP MLD receives the first frame and manages the transition process, acting as a mediator that ensures seamless switching between APs while maintaining context information. This intermediary structure enables efficient coordination across multiple frequency bands without increasing transition time.
3Reliability
If the STA transitions between APs within the same logical AP MLD, then data continuity is maintained, but the complexity of managing multiple AP MLDs increases
Solution Approach 1:
The patent merges multiple AP MLDs under a single logical AP MLD architecture, allowing them to share common context information and management functions. This merging approach maintains data continuity during transitions while distributing the complexity across a hierarchical structure where the logical AP MLD coordinates the operations of individual AP MLDs. The unified architecture simplifies management compared to independent AP MLDs without compromising reliability.
Data Source
AI summary
Provided are a wireless communication method, an access point multi-link device (AP MLD) and a non-AP MLD. The method includes: a non-AP MLD receives or transmits a first frame, wherein the first frame is used for the non-AP MLD to transition between a first AP MLD and a second AP MLD, the first AP MLD and the second AP MLD are affiliated with a same third AP MLD or different third AP MLDs, and the third AP MLD is a logical AP MLD.