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Data frame scheduling method based on virtual links

A technology of virtual link and scheduling method, which is applied in the direction of data exchange network, digital transmission system, electrical components, etc., to achieve the effect of controllable flow

Inactive Publication Date: 2015-06-17
AVIC NO 631 RES INST
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The best-effort (BE) and collision avoidance characteristics of message delivery in traditional data networks are not suitable for use in airborne networks known for their security and reliability

Method used

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  • Data frame scheduling method based on virtual links
  • Data frame scheduling method based on virtual links
  • Data frame scheduling method based on virtual links

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Embodiment Construction

[0026] The invention divides the time axis into scheduling response time windows according to the bandwidth requirements of different virtual links, and periodically polls each virtual path whether there is data to be sent in combination with a timer trigger mechanism. In the virtual link scheduling process, due to the limitation of the sending time window (or bandwidth allocation interval BAG: Bandwidth Allocation Gap) of each virtual link, there may be sending competition among multiple virtual links at a certain point in time, from the contention Selecting one of the virtual links for scheduling and sending will cause other virtual links to wait, so that data cannot be sent according to the normal BAG, so virtual link scheduling will inevitably introduce jitter. Jitter refers to the time interval from the beginning of the BAG to the sending of the first bit of the frame. It is a fixed sending delay caused by factors such as virtual link scheduling and traffic shaping. The m...

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Abstract

The invention provides a data frame scheduling method based on virtual links. The data frame scheduling method includes the following steps: 1, after a virtual link module receives data, a bandwidth allocation gap value allocated by a system to the corresponding virtual links is set; 2, waiting is carried out in FIFO, operation is carried out in a scheduling module, a jitter upper limit value distributed by the system is obtained, and the data are transmitted to an MAC within the range of the time value; each virtual link has an effective transmission identification, and a scheduler determines whether flow shaping is carried out on the virtual links or not according to the states of BAG timers corresponding to the effective transmission identifications to serve as a signal for controlling flow shaping and synchronous scheduling of the virtual links. By means of the data frame scheduling method based on the virtual links, it is guaranteed that during large-data-volume communication, a virtual path has the balanced flow and the rated bandwidth, and therefore the certainty and the effectiveness of information transmission time in the virtual path can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of airborne computer communication, and in particular relates to the design and realization of a virtual link-based frame transmission scheduling method in an airborne network. Background technique [0002] From the perspective of airborne network applications, it is necessary to provide real-time data communication services with end-to-end delay upper bounds for aviation applications and services. The best-effort (BE) and collision avoidance characteristics of message delivery in traditional data networks are not suitable for use in airborne networks known for their security and reliability. [0003] In order to meet real-time, delay-bounded data transmission, a data frame scheduling that guarantees balanced traffic and rated bandwidth in the virtual channel during large data communication, so that the determinism and validity of message transmission time in the virtual channel are guaranteed method. Con...

Claims

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Application Information

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IPC IPC(8): H04L12/803H04L12/911
Inventor 牛文生王红春田莉蓉邱征陈长胜王建宇于峰朱佳
Owner AVIC NO 631 RES INST
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