Multi-Link Concurrent Connections for Zero-Interruption Roaming
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Solution Overview
Problem
In IEEE 802.11 standard, non-AP MLDs experience service transmission interruptions during roaming or multi-network concurrent connections due to the need to disconnect from an original AP MLD before connecting to a new one, failing to meet low-latency requirements.
Innovation Solution
A multi-link concurrent connection method that allows devices to establish connections to multiple APs without disconnecting, using separate MAC layer interfaces and managing link frequencies to enable seamless roaming and concurrent connections, reducing interruption time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If non-AP MLD disconnects from original AP MLD before connecting to new AP MLD, then connection management is simplified, but service transmission interruption time increases
Solution Approach 1:
The patent establishes a connection to the new AP MLD before disconnecting from the original AP MLD. The non-AP MLD performs link establishment procedures with the new AP MLD while maintaining the existing connection, so that service transmission can continue through the original connection until the new connection is fully established, thereby reducing interruption time
Solution Approach 2:
The patent introduces a multi-link connection mechanism where the non-AP MLD can maintain connections to multiple AP MLDs simultaneously through different links. This intermediary multi-link state allows service transmission to be redirected from the original AP MLD to the new AP MLD without complete disconnection, reducing service interruption time while managing connection complexity
2Loss of time
If non-AP MLD maintains connection to original AP MLD while connecting to new AP MLD, then service transmission interruption is reduced, but connection management complexity increases
Solution Approach 1:
The patent segments the connection management into separate link-level operations. Each link between non-AP MLD and AP MLD can be managed independently, allowing the device to maintain multiple simultaneous connections through distinct link control mechanisms. This segmentation enables parallel connection management while reducing overall system complexity
Solution Approach 2:
The patent implements a universal multi-link operation framework that handles both single-link and multi-link scenarios through the same protocol mechanisms. The connection management system can dynamically adapt between maintaining one connection or multiple connections, providing multi-functionality that reduces complexity by using unified procedures rather than separate management systems
3Adaptability or versatility
If separate MAC layer interfaces are used for different link sets, then concurrent connections are enabled, but device complexity increases
Solution Approach 1:
The patent merges multiple MAC layer interface operations into a unified multi-link operation framework. Instead of implementing completely separate MAC interfaces for each link set, the system combines their functions into a single coordinated interface that can handle multiple links simultaneously, reducing device complexity while maintaining concurrent connection capability
Solution Approach 2:
The patent transitions from a single-dimensional MAC interface model to a multi-dimensional link set architecture. By organizing connections into distinct link sets that can be independently managed and activated, the system enables concurrent connections across different dimensions (link sets) while keeping the base MAC layer complexity manageable through hierarchical organization
Data Source
AI summary
In a multi-link concurrent connection method, a first device establishes a multi-link connection to a second device via a first link set, where the first link set includes a first link and a second link. The first device establishes a multi-link connection to a third device via a second link set, where the second link set includes a third link and a fourth link, and operating frequencies of the third link and the first link are the same. Alternatively, operating frequencies of the third link, the first link, and the second link are all different.