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Scheduling method of avionics full duplex switched Ethernet (AFDX) exchanger

A technology of avionics and scheduling methods, applied in data exchange networks, electrical components, digital transmission systems, etc., can solve problems such as reducing delay time and failing to meet emergency message dispatching requirements, and achieve the goal of reducing delay time and improving service quality Effect

Inactive Publication Date: 2011-09-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
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AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiency that the existing technology cannot meet the emergency message dispatching requirements, the present invention provides an avionics full-duplex switched Ethernet switch dispatching method, according to the different deadlines of each message frame, priority is given to sending emergency messages with smaller deadlines , so that urgent messages can be served immediately when they need to be transmitted, reducing delay time

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  • Scheduling method of avionics full duplex switched Ethernet (AFDX) exchanger
  • Scheduling method of avionics full duplex switched Ethernet (AFDX) exchanger

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Embodiment Construction

[0020] Messages are transported between the two end systems over virtual links. Considering that an end system A (source end system) needs to send a message E to end system B (destination end system), it is assumed that the virtual link whose ID number is 10 of the VL transmits the message.

[0021] Step 1. End system A encapsulates the message frame and schedules it to meet the requirements of VLID10, and sends message E to VLID10 for transmission.

[0022] Step 2: The message E is sent to the AFDX switching network, assuming that the message E is a frame meeting the requirements.

[0023] Step 3: The message E enters the Rx buffer of the switch, and the output buffer of the message is determined according to the configuration table.

[0024] Step 4: Determine the VQQ from input to output of message E.

[0025] Step 5: The counter in the VQQ calculates the deadline of the message E, and gives the message E an initial priority.

[0026] Assuming that there are 4 messages wa...

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Abstract

The invention discloses a scheduling method of an avionics full duplex switched Ethernet (AFDX) exchanger. The method comprises the following steps of: encapsulating a message to be sent into a message of a standard Ethernet format and filtering; sending the filtered message to an output buffer area of the AFDX exchanger according to a route configuration table and establishing a virtual output queue (VQQ); calculating the urgency degree of each VQQ message and setting an initial priority; and sequentially sending messages according to priorities. By adopting the scheduling method, the delay time of high-priority messages is reduced effectively, and the service quality of an AFDX network is enhanced.

Description

technical field [0001] The invention relates to a scheduling method for an Ethernet switch. Background technique [0002] Avionics full-duplex switched Ethernet (AFDX) is evolved on the basis of commercial Ethernet. It adds a "deterministic network" real-time guarantee mechanism and dual redundancy management to traditional Ethernet. The reliability mechanism to meet the needs of modern avionics has become a new generation of avionics system bus. [0003] For the aircraft network, each network transmission request must be served, and the end-to-end delay of each transmission must be guaranteed, which involves the reasonable and efficient scheduling of messages between avionics systems. In the process of message transmission between AFDX end systems, a suitable one-way virtual link (VL) is first defined for message transmission, and the message is encapsulated into a standard Ethernet frame format through UDP header, IP header, and Ethernet frame header in turn , through tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/863
Inventor 李杜娟张建东史国庆吴勇时洋洋
Owner NORTHWESTERN POLYTECHNICAL UNIV
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