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Industrial wireless network media access control method

A media access control and industrial wireless network technology, applied in wireless network protocols, wireless communication, network traffic/resource management, etc., can solve the problems of communication quality degradation and wireless technology application obstruction, and achieve the effect of alleviating the serious decline of communication quality

Inactive Publication Date: 2011-01-19
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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Problems solved by technology

In addition, the communication quality of wireless communication in the industrial environment is severely degraded, which makes the existing media access control methods unable to better meet the application requirements of industrial wireless networks, and the application of wireless technology in the field of industrial networked control is hindered

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  • Industrial wireless network media access control method
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Embodiment Construction

[0016] The present invention will be described in detail below with reference to the accompanying drawings.

[0017] The control method of the present invention specifies four types of frames: beacon frame, data frame, response frame and command frame. The beacon frame can only be organized and sent by the communication controller (coordinator, such as LAS in FF) in the wireless industrial control system. The beacon frame mainly includes information such as the basic situation of the communication controller itself, the starting time slot of the superframe, and whether other network devices have data in the communication controller. The role of the beacon frame is mainly to allow the child device to obtain the basic information of the parent device when the child device joins the network, which mainly includes the network identifier, network address and MAC address of the parent device. At the same time, the beacon frame is used as the start identifier of the superframe to re...

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Abstract

The invention relates to an industrial wireless network media access control method. In the control method, four types of frames, namely a beacon frame, a data frame, a response frame and a command frame are specified; meanwhile, in the operating process of the method, a protocol session mechanism, an access mechanism, an interframe forced waiting mechanism, a withdrawing mechanism after a busy channel is detected, a data retransmission mechanism and a packet receiving repeated monitoring mechanism are integrated into a system through a state machine. In the method, a superframe mechanism is adopted and a competition period and a non-competition period in each superframe are allocated according to a periodic communication task and an aperiodic communication task in the industrial Internetof things, so that real-time scheduling of the periodic communication task and the aperiodic communication task which are transmitted by an upper layer in a data link layer is considered, and negative effects of severe reduction in the communication quality of wireless technology in an industrial environment on industrial network application can be effectively relieved.

Description

technical field [0001] The invention relates to an industrial control method, in particular to a special industrial wireless network media access control method. Background technique [0002] The problems in the data link layer can be mainly classified into two major problems, one is the access problem, and the other is the scheduling problem. This is exactly the function that the media access control method should focus on. At present, most media access control methods only consider the characteristics of the physical layer, and do not consider the high-level, especially the application layer. As a typical application in the industrial Internet of Things - a wireless-based industrial networked control system, its application layer It is closely related to the data link layer, and most of its communication information is determined in advance at the application layer (periodic communication tasks in the generated scheduling schedule). In addition, the quality of wireless c...

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Application Information

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IPC IPC(8): H04W28/06H04W72/12H04W74/08H04W80/02
Inventor 王军逄玉俊陈未如魏立峰
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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