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Dithering-free transmitting and scheduling method of aviation full duplex switched Ethernet terminal

A scheduling method and full-duplex technology, applied in the field of aviation full-duplex switched Ethernet communication technology, can solve the problems that affect the certainty of data transmission and cannot avoid the jitter of multiple virtual links, so as to avoid conflicts and ensure deterministic effect

Inactive Publication Date: 2011-02-02
CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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Problems solved by technology

[0018] The present invention aims at the problem that the two parameters of BAG and Jitter defined in the ARINC664 specification cannot avoid the situation that multiple virtual links send jitter at the same time, thus affecting the certainty of data transmission, and provides an aviation full-duplex A jitter-free transmission scheduling method for switched Ethernet terminals. This scheduling method can completely avoid jitter (the scheduling time of transmission frames does not overlap), that is, it can avoid any two virtual links from being scheduled and transmitted at the same time under the condition of ensuring BAG and transmission bandwidth.

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  • Dithering-free transmitting and scheduling method of aviation full duplex switched Ethernet terminal
  • Dithering-free transmitting and scheduling method of aviation full duplex switched Ethernet terminal
  • Dithering-free transmitting and scheduling method of aviation full duplex switched Ethernet terminal

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Embodiment Construction

[0030] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0031] see image 3 , the present invention divides the time axis into several time slots in order to realize jitter-free transmission scheduling. Since the minimum data frame length of an AFDX is 64+20 bytes, it takes 6.72us to send at a rate of 100Mbps. It is reasonable to set the minimum interval of 4us and is convenient for hardware implementation, so the minimum time slot can be set to 4us ( According to the time of data transmission and the complexity of hardware implementation, the time slot can also be set to other values), the time slots involved in the following are all 4us.

[0032] Further, the present invention adds two parameters of period (Period) and offset (Offset) for each virtual link.

[0033] Period (Period) represents the...

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Abstract

The invention discloses a dithering-free transmitting and scheduling method of an aviation full duplex switched Ethernet terminal. In the method, two parameters of period and excursion are put forward on the basis of BAG and Jitter; a time shaft is divided into a plurality of time slots by the two parameters; and then the different time slots are distributed to each virtual link, and when the distribution of the time slots meets the requirement of each virtual link BAG, the conflicts of the plurality of virtual links on the time shaft are avoided. Therefore, each virtual link can transmit a data frame according to the distributed time slots, thereby realizing the dithering-free transmission of the frames.

Description

technical field [0001] The invention relates to a communication technology, in particular to an aviation full-duplex switched Ethernet communication technology. Background technique [0002] Avionic Full-Duplex Switched Ethernet (AFDX / ARINC 664) is a deterministic aircraft data network bus used for information transmission in avionics systems. The aviation full-duplex switched Ethernet network adopts the standard IEEE802.3 technology, and the Ethernet hardware equipment, cables and test equipment used have been widely used and verified by a large number of COTS products, thereby reducing the cost of the aircraft data bus network. However, the traditional Ethernet itself does not meet the real-time and reliability requirements of the network in the avionics system. Therefore, the aviation full-duplex switched Ethernet adds a deterministic timing mechanism and a reliable information transmission mechanism on the basis of the traditional Ethernet. To adapt to the application o...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L12/28H04L12/721
Inventor 高磊张平张效赢谭永亮
Owner CHINESE AERONAUTICAL RADIO ELECTRONICS RES INST
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