Exchange Ethernet data flow control strategy optimization selection method

Abstract

The embodiment of the invention discloses an exchange Ethernet data flow control strategy optimization selection method. The method comprises the following steps: S10, adopting a rate constraint control strategy for data flow transmitted in the exchange Ethernet; s30, adopting a first-in first-out data flow control strategy if data flow transmission with the same priority exists in the switched Ethernet; s50, if data streams with different priorities are transmitted in the switched Ethernet, a strict priority data stream control strategy is adopted; s70, if a relatively fair sending opportunity needs to be provided for the low-priority data flow, a "starvation" phenomenon caused by continuous waiting of the low-priority data flow is avoided, and a reshaper control strategy based on credits is adopted; s90, if a certain data stream type in the switched Ethernet has a strict real-time transmission requirement, adopting a time division multiple access strategy.

Description

technical field [0001] The invention relates to the field of optimal design of communication networks of safety-critical systems. More specifically, it relates to a method for optimally selecting a switching Ethernet data flow control strategy. Background technique [0002] Switched Ethernet has the advantages of high bandwidth and low cost, and its extensive application base enables it to have rich technical support for commercial off-the-shelf products. At present, the demand for transforming it into a real-time control network has doubled. Since switched Ethernet uses the Best-Effort communication strategy, the transmission quality is not guaranteed. When it is applied in a safety-critical system, it is necessary to add a corresponding real-time guarantee mechanism to provide deterministic data transmission services and ensure data flow. The end-to-end delay has the worst upper bound. The network calculus method can be used to calculate the worst upper bound of the end-...

AI Technical Summary

Problems solved by technology

[0004] Usually switched Ethernet is customized and modified according to special timing application requirements, using a fixed data flow control strategy, and generally limiting the definition of 2 to 3 priority data flow types, which leads to the need to map multiple types of data flows with different timing requirements to The same priority, it is difficult to guarantee the specific real-time transmission requirements of multi-priority data streams

For example: Time-Triggered Ethernet (Time-Triggered Ethernet, TTEthernet) defines 3 priority data flow types, it adopts time-division multiple access strategy on the basis of switched Ethernet, based on time-triggered mechanism, all activities in the network are based on system The clock synchronization can ensure the deterministic transmission of data streams, but the sending time of data streams needs to rely on offline scheduling tables, and the design of offline scheduling tables is complex

In addition to the time-triggered mechanism, another type of modified network is based on the event-triggered mechanism, which has low network overhead, but cannot avoid delay interference caused by data flow contention for physical links, such as Avionics Full-Duplex Switched Ethernet (Avionics Full-Duplex Switched Ethernet). Ethernet, AFDX), which defines 2 priority data stream types

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