Method for scheduling wireless networked control system with maximal tolerant time delay

A networked control and wireless technology, applied in electrical program control, comprehensive factory control, etc., can solve problems such as delay uncertainty, task timeout, and follow-up task timeout, and achieve the effect of reducing timeout.

Inactive Publication Date: 2013-06-19
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Problems solved by technology

However, the delay caused by wireless channels in harsh industrial environments due to reasons such as high error rates is uncertain.
If the delay is large, the scheduling of the communication task will not be completed within the scheduled time, that is, the task times out
At the same time, due to the tight arrangement of communication tasks, the timeout of one communication task may cause all subsequent tasks to time out, making the task timeout rate of the entire system higher

Method used

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  • Method for scheduling wireless networked control system with maximal tolerant time delay

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Embodiment Construction

[0014] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings.

[0015] The basic principle of the method of the present invention: Since in the industrial wireless networked control system, the communication tasks and the function block tasks are not of the same quality, the scheduling method that greatly tolerates the wireless communication time delay adopts different functions for the function block task scheduling and the communication task scheduling. Scheduling strategy. Use the compact scheduling policy scheduling for the task scheduling of the function block, and the scheduling policy for the communication task is to wait until the deadline of the communication task arrives before allowing the subsequent tasks to be scheduled, so as to reserve as long as possible processing time for the communication task .

[0016] This method firstly sorts the jobs according to the priority, and then schedul...

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Abstract

The invention discloses a method for scheduling a wireless networked control system with maximal tolerant time delay, and relates to a method for scheduling a network system. The method includes the processes: firstly, sequencing application layers of the industrial networked control system according to priorities specified by the system and extracting a first task in an operation to start building a task scheduling list and setting task start time and stop time; secondly, scheduling a next task in the operation; and thirdly, scheduling all tasks in a next operation, failing in scheduling if calculated theoretical completion time is not shorter than the deadline of the task, and rescheduling and issuing all operations and the tasks in each operation by the application layers of the industrial networked control system. By fully considering the characteristics of wireless communication technology and by the aid of the principle that network time delay is not fully equivalent to instantaneity of the system, the time delay is effectively shortened, instantaneity of the system can be improved, and the disadvantages of wireless communication technology application in the industrial networked control system are made up.

Description

technical field [0001] The invention relates to a network system scheduling method, in particular to a wireless networked control system scheduling method that tolerates a great delay. Background technique [0002] At present, most of the real-time scheduling methods used in the application layer of many wired industrial networked control systems (some systems separate the user layer) assume that the channel error rate is low, the delay is short and stable. Wired transmission is not greatly affected by the industrial environment. This assumption is valid in the application of wired industrial networked control systems. Therefore, some existing scheduling methods regard the functional tasks and communication tasks in industrial networked control systems as Homogeneous, all tasks are scheduled uniformly using a compact scheduling method. The scheduling idea is better applied in the wired industrial networked control system. However, the introduction of wireless communication...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
Inventor 王军
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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