A protocol control method facing wireless industrial control network

A technology of industrial control network and protocol control, applied in the field of network protocol stack, can solve the problem of inability to guarantee the fairness of wireless channel access, and achieve the effect of improving the flexibility of use and reliable work

Inactive Publication Date: 2009-10-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the 802.11 protocol still uses the BEB backoff mechanism, so the fairness of wireless channel access cannot be guaranteed
At present, there is no suitable protocol for industrial wireless control network

Method used

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  • A protocol control method facing wireless industrial control network
  • A protocol control method facing wireless industrial control network
  • A protocol control method facing wireless industrial control network

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Experimental program
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Embodiment Construction

[0050] A preferred embodiment of the present invention is described in detail with reference to the accompanying drawings as follows:

[0051] See figure 1 , This protocol control method for wireless industrial control network is: in order to meet real-time requirements and reduce costs, its communication model is simplified on the basis of OSI (Open Interconnection Model). It only uses 3 layers in the OSI model, namely the physical layer, the data link layer and the application layer.

[0052] The data link layer in this protocol stack is divided into 2 layers. The lower sublayer of the data link layer still uses CSMA as the actual wireless channel access control protocol. The upper sublayer of the data link layer uses a token-based control mechanism to control the lower CSMA. The basic operation process is as follows: ① Establish a token logical ring in a fully interconnected wireless distributed system. All STAs (stations) working in the receiving / transmitting mode in the syst...

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Abstract

The invention relates to a protocol control method oriented to a wireless industrial control network. Its communication model is made up of physical layer, data link layer and application layer, and described physical layer and application layer adopt the physical layer and application layer of international standard network interconnection model OSI respectively, it is characterized in that described data link layer It is divided into two layers: the lower sublayer uses the traditional carrier sense multiple access CSMA protocol as the wireless channel access control protocol; the upper sublayer uses a token-based control protocol to establish a Token logical ring, thereby controlling the CSMA protocol of the lower sublayer; setting a token logical ring self-healing mechanism to avoid token logical ring failure due to token loss; and determining a token logical ring expansion and contraction mechanism, so that The system can automatically adapt to the joining and exiting changes of each mobile station. The invention can avoid the collision in communication transmission and meet the real-time control requirement for industrial objects.

Description

Technical field [0001] The invention relates to a network protocol stack, in particular to a protocol stack oriented to a wireless industrial control network. Background technique [0002] In industrial field control, it is difficult or impossible to use cables for sensors on moving or rotating objects, handheld data acquisition equipment, and equipment that needs to be temporarily installed. At the same time, the use of wired physical media connections in extremely cold, hot, dangerous, and humid environments will also reduce the reliability of the communication system. With the development and maturity of wireless communication technology, it is possible to apply wireless communication technology to industrial control networks to form a wireless industrial control network WICN (Wireless Industrial Control Network). [0003] An important issue in its related research is the study of the data link layer protocol. The data link layer protocol has a great impact on the real-time pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06
Inventor 侯维岩
Owner SHANGHAI UNIV
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