Make-Before-Break Roaming for Multi-Link Devices Across Non-Collocated APs
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Solution Overview
Problem
Existing wireless local area network (WLAN) technologies face challenges in seamless roaming between collocated and non-collocated Access Points (APs, leading to connectivity issues and inefficiencies in managing multiple data paths.
Innovation Solution
Implementing a method and device that leverage IEEE 802.11k/v/r features with make-before-break-roaming (MBBR) control-plane extensions, enabling simultaneous connections to multiple APs and allowing seamless transitions without re-association, using control-plane communication and mobility domain-unique Link IDs to manage non-collocated APs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional roaming methods are used between collocated and non-collocated APs, then connectivity can be maintained, but roaming speed and reliability deteriorate due to scanning requirements and re-association processes
Solution Approach 1:
The patent implements make-before-break roaming by establishing a preliminary connection to the target AP before disconnecting from the serving AP. The non-AP MLD connects to both serving and target APs simultaneously, performs authentication and association with the target AP in advance, and only then breaks the connection with the serving AP. This preliminary action eliminates the traditional break-before-make approach, ensuring continuous connectivity and reducing roaming time while maintaining reliability.
Solution Approach 2:
The patent maintains continuous data path connectivity during roaming transitions by keeping the non-AP MLD connected to the serving AP while establishing connection to the target AP. The control plane enables seamless handover where the non-AP MLD remains associated with the WLAN SSID throughout the transition, ensuring uninterrupted useful action (data transmission) during the roaming process.
2Adaptability or versatility
If multiple data paths are managed simultaneously in multi-AP environments, then connectivity redundancy is improved, but device complexity and management overhead increase
Solution Approach 1:
The patent introduces a control plane as an intermediary layer that manages multiple data paths between non-AP MLDs and collocated/non-collocated APs. The control plane handles association, authentication, and path management functions, abstracting the complexity of multi-path management from the data plane. This intermediary enables adaptability across multiple APs while containing device complexity in the control logic layer.
Solution Approach 2:
The patent segments the communication function into separate control plane and data plane components. The control plane manages the complexity of multi-AP coordination, authentication, and association, while the data plane handles actual data transmission. This segmentation allows multiple data paths to be managed simultaneously without proportionally increasing overall system complexity, as the control plane efficiently coordinates all paths.
3Productivity
If seamless roaming is implemented without re-association, then productivity and speed are improved, but the system requires complex control-plane extensions and MLD constructs
Solution Approach 1:
The patent employs the Wi-Fi 7 Multi-Link Device (MLD) construct as a universal framework that handles both collocated and non-collocated AP scenarios. The MLD architecture provides multi-functionality by supporting simultaneous connections to multiple APs, fast transition procedures, and seamless roaming capabilities within a single standardized framework. This universality enables high roaming efficiency without requiring separate complex solutions for different AP deployment scenarios.
Data Source
AI summary
A method to facilitate roaming from a serving Access Point (AP) to a non-collocated AP is described. The method includes detecting, by an Access Point (AP) actor, that a communication metric characterizing communication between the AP actor and a non-AP actor is indicative of reduced communication quality, in response to detecting, sending a request, by the AP actor, to the non-AP actor for a beacon report for respective link metric values for a plurality of non-collocated AP actors, receiving, in response to the request and from the non-AP actor, the beacon report including the respective link metric values for the plurality of non-collocated AP actors, and based on the respective link metric values for the plurality of non-collocated AP actors, sending, by the AP actor, to the non-AP actor, a list of a subset of the plurality of non-collocated AP actors from which the non-AP actor may select to roam.