A protocol stack facing wireless industrial control network

A technology of industrial control network and protocol stack, which is applied in the field of network protocol stack, can solve problems such as the 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: 2007-05-16
SHANGHAI UNIV
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  • 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 stack facing wireless industrial control network
  • A protocol stack facing wireless industrial control network

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Embodiment Construction

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

[0051] Referring to Figure 1, the protocol stack 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 adopts 3 layers in OSI model, namely physical layer, data link layer and application layer.

[0052] The data link layer in this protocol stack is divided into two layers. The lower sublayers of the data link layer still use 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 CSMA of the lower layers. The basic operation process is as follows: ① A token logical ring is established in the fully interconnected wireless distributed system, and all STAs (stations) working in the receiving / transmitting ...

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Abstract

The related protocol stack oriented to wireless industrial control network comprises: a physical layer and an application layers both built as OSI, a data chain layer included two layers. Wherein, the lower sub-layer of data chain layer uses traditional CSMA protocol as the control protocol for wireless channel access, and the upper sub-layer uses token-based CSMA protocol to build token logic loop in connected wireless distributed system and control the lower CSMA protocol; there is a recovery mechanism and a logic expansion / contraction mechanism for token logic loop.

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] For sensors on moving or rotating objects in industrial field control, handheld data acquisition equipment, and equipment that needs to be temporarily installed, the use of cables is difficult or even impossible. At the same time, the use of wired physical media connection 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 network to form a wireless industrial control network WICN (Wireless Industrial Control Network). [0003] An important problem in its related research is the research on the data link layer protocol, and the data link layer protocol problem has a great ...

Claims

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Application Information

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IPC IPC(8): H04L29/06
Inventor 侯维岩
Owner SHANGHAI UNIV
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