Industrial wireless network frequency-domain polling method based on OFDM technology

A technology of industrial wireless network and polling method, which is applied in the field of frequency domain polling of industrial wireless network based on OFDM technology, can solve the problems of low resource utilization rate, high cost of polling technology, and high cost, so as to ensure real-time performance and The effect of improving reliability, improving effective throughput, and improving bandwidth utilization

Active Publication Date: 2013-12-18
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

[0011] Aiming at the problems of high overhead, low resource utilization, and unguaranteed performance in existing methods, the present invention proposes an OFDM-based industrial wireless network frequency domain polling method, aiming to solve the existing polling problems for industrial wireless networks. Problems that are difficult to guarantee such as large technical overhead, low bandwidth utilization rate of TDMA method, real-time performance and network scale

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  • Industrial wireless network frequency-domain polling method based on OFDM technology
  • Industrial wireless network frequency-domain polling method based on OFDM technology
  • Industrial wireless network frequency-domain polling method based on OFDM technology

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] The present invention proposes an industrial wireless network frequency domain polling method based on OFDM technology. Its main idea is to use OFDM subcarriers to realize frequency domain polling responses, so that the AP can Multiple stations are polled at once; after the AP receives the node's response in the frequency domain, it does not need to accurately restore the original data sent by each node on each subcarrier, but only needs to detect the subcarrier through threshold / peak detection or other technical means Whether it is active; if it is active, it means that there is data to be transmitted, otherwise it means that there is no data.

[0034] The method of the present invention includes polling initial configuration, OFDM frequency domain polling, TDMA time slot allocation and node data transmission, specifically comprising the following ste...

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Abstract

The invention relates to the field of industrial wireless network technology, in particular to an industrial wireless network frequency-domain polling method based on an OFDM technology. The method includes that AP distributes a polling group ID and a subcarrier ID for new nodes added in the network; the AP sends a polling request pocket and utilizes OFDM subcarrier in the frequency field to response after the nodes receive the polling request pocket; the AP distributes TDMA time slots to the nodes required to transmit data according to response situation of each polled node; the nodes transmit data in corresponding time slots after receives the TDMA time slot distributed results. The method is provided on the premise of considering industrial wireless network application features fully, can reduce network protocol overhead and increases bandwidth utilization and effective network throughput, and accordingly improves real time and scale of the network.

Description

technical field [0001] The invention relates to industrial wireless network technology, in particular to an industrial wireless network frequency domain polling method based on OFDM technology. Background technique [0002] Wireless network technology has begun to be used in the field of factory automation, and has gradually become a hot spot of development. Compared with the traditional wired bus technology, wireless technology has the advantages of easy installation and maintenance, and can avoid problems such as easy aging of cables caused by equipment movement, and easy failure of electrical contact between slip rings. Therefore, in high-speed workshop-level factory automation, wireless technology has great application potential. [0003] In wireless communication, multiple terminals share channel resources and cause conflicts. In order to solve this problem, the IEEE 802.11 protocol proposes two methods, one is Carrier Sense Multiple Access with Collision Avoidance (C...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26
CPCH04B7/2615H04W74/06H04W84/18
Inventor 梁炜于海斌林俊如张晓玲曾鹏杨中兴李世明
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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