Modular AVB Stream Reservation for TSN Network Redundancy
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Solution Overview
Problem
Existing Time Sensitive Networking (TSN) protocols in industrial environments lack redundancy and high availability, leading to network breakdowns and inefficiencies due to the lack of consideration for local configuration and resource management, resulting in high memory requirements and limited stream processing capabilities in terminals.
Innovation Solution
A method that introduces a modular reservation procedure using the L_BRIDGE attribute in the TSN protocol, allowing for efficient path reservation and data forwarding based on latency times, enabling targeted data transmission and reducing network load by using a database to store registration information and optimizing data transmission paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all terminals receive all stream information in the network, then complete stream information is available to all terminals, but memory requirements and network load increase significantly
Solution Approach 1:
The patent implements selective information distribution where network elements receive and process only the stream information relevant to their local configuration and function. Each terminal buffers and forwards only necessary stream data rather than all network streams, reducing memory requirements while maintaining reliability for required streams.
Solution Approach 2:
The network information distribution is segmented into local relevant streams and remote streams. Terminals are divided into different roles (ingress, egress, transit) with specific information buffering requirements. This segmentation allows each terminal to manage a reduced subset of stream information while the network as a whole maintains complete stream availability.
2Device complexity
If a single active connection is used in the network, then network configuration is simple, but redundancy and high availability are lost
Solution Approach 1:
The patent establishes reserved paths and redundancy configurations in advance through pre-configuration of network elements. Multiple potential paths are pre-established with designated ingress and egress points, allowing rapid failover without complex runtime configuration decisions, thus maintaining both simplicity and reliability.
3Reliability
If the reservation protocol forwards stream information to all terminals, then resource availability can be checked beforehand, but network load and processing requirements increase
Solution Approach 1:
Stream information forwarding is optimized by directing information only to terminals that have local configuration requirements for those streams. Ingress terminals receive stream information for upstream resource checking, while egress terminals receive information for downstream verification. This selective forwarding reduces network load while maintaining resource availability verification.
4Productivity
If terminals are made more powerful to handle multiple streams, then stream processing capability increases, but terminal cost increases
Solution Approach 1:
Terminals implement partial buffering and processing of stream information - only the portion necessary for their specific function. Ingress terminals buffer information for upstream resource verification, egress terminals for downstream verification, and transit terminals minimize buffering. This partial action approach provides sufficient stream processing capability for each terminal's role without requiring all terminals to be fully powerful, thus controlling costs.
Data Source
AI summary
The invention relates to methods and to a device for the modular orientation of an AVB stream. The introduction of a new attribute (L_BRIDGE) into the reservation protocol that has been further developed for TSN allows to better use the existing mechanisms in the Ethernet Standard. To this end, each receiver and each transmitter has to announce himself in the network (already existing for the transmitters).