Client-Driven Semi-Hitless Roaming for Multi-Link Wi-Fi
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Solution Overview
Problem
The challenge in Wi-Fi networks is the reduction of connectivity during roaming due to complexities and delays in transferring device state from one access point to another, which is not acceptable for high-reliability applications like Augmented Reality/Virtual Reality and automated manufacturing.
Innovation Solution
A light-weight roaming protocol that enables a Multi-Link Device (MLD) to minimize the transfer of device state by handling state transfer management during handover processes, allowing seamless switching between access points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional roaming protocols are used to enable client movement between access points, then client mobility is achieved, but connectivity disruption and delays occur during handover
Solution Approach 1:
The system performs preliminary actions by establishing the roaming relationship and configuring the target access point before the client actually roams. The source access point forwards data to the target access point in advance, and the target access point prepares to receive and forward data, ensuring seamless connectivity when the client switches access points.
Solution Approach 2:
The source access point acts as an intermediary by forwarding data from the network to the target access point before the client completes roaming. This intermediary forwarding mechanism ensures that data transmission continues without interruption during the handover process, maintaining connectivity reliability.
2Adaptability or versatility
If device state is transferred from one access point to another during roaming, then roaming functionality is enabled, but complexity and delays increase
Solution Approach 1:
The patent extracts the state transfer management responsibility from the access points and relocates it to the client device. The client autonomously manages its own state information during roaming, eliminating the complex state synchronization requirements between access points and reducing overall system complexity.
Solution Approach 2:
The client device performs self-service by autonomously managing its own state information during roaming transitions. The client maintains its own connection state and seamlessly switches between access points without requiring complex state transfer protocols between access points, thereby reducing system complexity.
3Reliability
If data transmission continues during roaming handover, then connectivity is maintained, but data loss or duplication may occur
Solution Approach 1:
The system implements feedback mechanisms where the source access point monitors the roaming status and continues forwarding data to the target access point only until the client successfully connects to the target. The target access point acknowledges received data, and the source access point stops forwarding upon receiving confirmation, preventing both data loss and duplication.
Solution Approach 2:
The source access point preliminarily forwards data to the target access point before the client completes roaming, ensuring no data loss. The system then uses feedback to stop forwarding once the client is successfully connected, preventing data duplication. This preliminary forwarding combined with feedback control maintains connectivity while preventing information errors.
Data Source
AI summary
Aspects of the present disclosure are directed to techniques for a light-weight roaming protocol in a Multi-Link Operation wireless network. In one aspect, a method includes detecting a roaming point, wherein the roaming point is an event that triggers a user equipment to switch connectivity from a first access point to a second access point, and the user equipment, the first access point, and the second access point operate as multi-link devices. The method further includes maintaining, by the first access point, transmission of downlink data to the user equipment after the roaming point until one of a plurality of conditions occurs; and discarding uplink traffic from the user equipment.