Data Forwarding for Seamless Roaming in Wireless LANs

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Solution Overview

Problem

Existing Wi-Fi networks face challenges in seamless roaming due to delays in migrating network connections between access points, leading to temporary disruptions, especially in applications with low latency requirements.

Innovation Solution

Implementing data forwarding capability information exchange between source and target access points (APs) to identify and transfer a portion of data during roaming, utilizing multi-link devices (MLDs) to minimize gaps in transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional roaming connection migration is used, then network connectivity is maintained, but transmission delays and interruptions occur during roaming transitions

Engineering Contradiction:

Improveroaming connectivityVSAvoidroaming transition delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The source access point forwards data to the target access point before the roaming transition is complete. This preliminary data transfer ensures that the target AP already has the necessary data when the client device connects, eliminating the traditional delay where data transmission must wait for roaming completion.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The source access point acts as an intermediary by receiving data from the network and forwarding it to the target access point during the roaming process. This intermediary role allows data to be pre-positioned at the target AP without requiring the client device to complete roaming first, thus reducing transmission delays.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If data forwarding is implemented during roaming, then transmission continuity is improved, but network complexity increases

Engineering Contradiction:

Improvedata transmission continuityVSAvoidroaming coordination complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The source access point serves as an intermediary that automatically forwards data to the target access point using existing Wi-Fi protocol mechanisms. This approach maintains transmission continuity without requiring complex external coordination systems, as the forwarding is handled through standard AP-to-AP communication channels.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The access points perform data forwarding autonomously using their existing capabilities and protocols. The source AP self-initiates the data forwarding to the target AP without requiring external controllers or complex coordination infrastructure, thereby maintaining reliability while limiting the increase in overall system complexity.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250212073A1Data forwarding for seamless roaming in wireless local area networks

Publication Date: 2025.06.26 CISCO TECHNOLOGY INC

AI summary

Disclosed are systems, apparatuses, processes, and computer-readable media for seamless roaming in networks. For example, an access point (AP) multi-link device (MLD) includes at least one memory and at least one processor coupled to the at least one memory. The processor is configured to: provide a data forwarding capability of the source AP MLD to a non-AP MLD; during roaming of the non-AP MLD to a target AP MLD, identify a first portion data in the source AP MLD to forward to the target AP MLD based on the data forwarding capability, wherein the target AP MLD and the source AP MLD are configured in a seamless mobility domain; and forward a first portion of data in the source AP MLD to the target AP MLD during roaming.