Method for redundant data transmission in a communication network, communication system, and configuration device

A method using dual VLANs with distinct spanning trees and frame identification addresses the limitations of existing redundancy protocols, enabling efficient, uninterrupted real-time data transmission in diverse industrial networks with standard Ethernet components.

WO2026068126A1 Publication Date: 2026-04-02SIEMENS AG
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Patent Information

Application Number
PCT/EP2025/074521
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-09-25
Filing Date
2025-08-28
Publication Date
2026-04-02

AI Technical Summary

Technical Problem

Existing redundancy protocols in industrial communication networks require special hardware and cause reconfiguration interruptions, limiting their applicability to standard Ethernet components and diverse network topologies.

Method used

Implementing a method that uses standard-compliant Ethernet hardware to configure dual virtual local area networks (VLANs) with distinct spanning trees for real-time and non-real-time data traffic, allowing seamless redundancy without additional headers or trailers, and employing sequence numbers or hash values to identify and discard duplicate frames.

Benefits of technology

Enables efficient, seamless redundancy in various network topologies without hardware modifications, ensuring uninterrupted real-time data transmission and optimizing resource use for different traffic types.

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Abstract

To achieve redundant data transmission in a communication network, at least a first (201) and a second virtual local area network (202), VLAN, are each configured on communication devices (101-104, 112-113, 122-123, 132-133, 142-144) of the communication network that forward datagrams (300). Different spanning trees are determined for each of the first (201) and second VLAN (202) within the communication network by applying a spanning tree protocol, said spanning trees being used to specify, for each of the first and second VLAN, active paths for forwarding datagrams via the forwarding communication devices. At least selected datagrams (300) to be transmitted are duplicated by a transmitter-side communication device (111) and transmitted both via the first VLAN (201) and via the second VLAN (202). Received datagrams (300) associated with the VLANs (201, 202) are each checked for identity with an already received datagram by receiver-side communication devices (121, 131, 141) and discarded if an already received identical datagram is present.
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