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A real-time Ethernet scheduling method for transmitting real-time data

A scheduling method and real-time data technology, applied in data exchange networks, transmission systems, digital transmission systems, etc., can solve problems such as increasing the end-to-end delay of real-time data, improve accuracy and effectiveness, improve utilization efficiency, The effect of reducing the delay

Active Publication Date: 2018-12-11
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to reduce the solution time and improve the schedulability, the offline solver usually schedules the solution in the worst case, so that the scheduling of real-time data can also meet the constraints in the worst case. In this way, the real-time Data end-to-end latency

Method used

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  • A real-time Ethernet scheduling method for transmitting real-time data
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Embodiment

[0023] The following will refer to Figure 1-6 Embodiments of the present invention will be described.

[0024] Such as figure 1 As shown, this embodiment proposes a real-time Ethernet scheduling method for transmitting real-time data, including the following steps:

[0025] Step 10, generate an offline scheduling table according to the network topology and the real-time message to be transmitted;

[0026] Further, before step 10, a real-time message to be transmitted is generated according to the received real-time message and data to be inserted, wherein the data to be inserted includes an identification bit, a message sequence number and a data payload length.

[0027] Specifically, such as figure 2 As shown, three new data are added in the real-time message: the is-copy flag in the unique data identifier flow-id, the sequence number of the message, and the length of the data payload. Among them, flow-id and length each account for 16 The sequence occupies 32 bits, and...

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Abstract

The invention discloses a real-time Ethernet scheduling method for transmitting real-time data. The method comprises the following steps: step 10, generating an offline scheduling table according to anetwork topology structure and a real-time message to be transmitted; step 20, generating a conversion message according to an offline schedule table and a real-time message to be transmitted, wherein that conversion message is a non-real-time message; Step 30, according to the corresponding transmission rule, sending the real-time message to be transmitted and the conversion message; Step 40, according to the offline scheduling table, filtering the received duplicate message, wherein, the duplicate message is a message to be transmitted with the same data unique identification or a convertedmessage with the same data unique identification. By adopting the technical proposal of the invention, the accuracy of transmitting the real-time message is ensured, the time delay in the process oftransmitting the real-time message is reduced, and the utilization rate of the data transmission bandwidth is improved.

Description

technical field [0001] The invention relates to the technical field of real-time Ethernet, in particular to a real-time Ethernet scheduling method for transmitting real-time data. Background technique [0002] For many years, embedded systems have played an important role in network communications in key fields such as the automotive industry, the aerospace industry, and the factory automation industry. With the continuous development of real-time networks, the scale and transmission requirements of real-time networks continue to increase. Traditional communication protocols can no longer meet the growing communication needs. Real-time Ethernet has become one of the most representative real-time networks by virtue of the natural advantages of Ethernet. [0003] Two types of data are defined in real-time Ethernet: real-time data and non-real-time data. Real-time data is used to transmit data with a definite transmission delay; non-real-time data is used to transmit potenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/863H04L29/06H04L12/26
CPCH04L43/028H04L47/50H04L47/62H04L47/6215H04L63/123
Inventor 万海李宗辉张世钱赵曦滨
Owner TSINGHUA UNIV
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