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Channel model based factory automation wireless network ARQ retransmitting method

A factory automation, wireless network technology, applied in the direction of error prevention/detection using return channels, can solve problems such as the inability to meet the high real-time requirements of factory automation networks, and achieve the goal of improving communication resource utilization and reducing maintenance and management. The effect of difficulty and cost reduction

Active Publication Date: 2014-03-26
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

[0008] The allocation of ARQ retransmission time slots under the TDMA mechanism requires the AP to broadcast resource allocation messages. When the number of retransmissions is large, the AP needs to pre-allocate network resources and broadcast resource allocation messages before each group of retransmission time slots. On the one hand, it will bring a lot of overhead to the TDMA system. On the other hand, this frequent time slot allocation cannot meet the high real-time requirements of the factory automation network.

Method used

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  • Channel model based factory automation wireless network ARQ retransmitting method
  • Channel model based factory automation wireless network ARQ retransmitting method
  • Channel model based factory automation wireless network ARQ retransmitting method

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Embodiment

[0048] For example, in a factory automation wireless network with 100 sites, to achieve a reliability index of 99.99%, set the packet loss rate P e is 10%, set the number of retransmission groups and the number of consecutive reserved time slots for each group through the channel model established by the packet loss rate, then the number of retransmission groups n≥2, here n=2. Number of consecutive reserved time slots in the first group m 1 ≥10, take 10 here; the number of consecutive reserved time slots in the second group m 2 ≥1, take 2 here.

[0049] Each station is identified by an ID number. After the periodic process data transmission is completed, the AP sends NACK information to each station, and each station extracts all the ID value information. For example, the ID values ​​in the NACK are 2, 11, 14, 19, 23, 27, 46, 57, 82, 90, and 95. The AP first arranges the ID values ​​in the NACK, and finds that the station with the ID value of 95 cannot send data in the next...

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Abstract

The invention relates to the industrial wireless network technology, in particular to a channel model based factory automation wireless network ARQ retransmitting method. The method is oriented to a star network of an IEEE 802.11 single-hop BSS structure, reduces difficulty for maintenance and management, improves the system flexibility, and meets the network real-time and reliable requirements as the method adopts a TDMA mechanism to support ordered transmission for retransmission data of large-scale network nodes in each TDMA time slot. The dynamic retransmission time slot reserving method based on a link layer channel model is adopted to ensure the reliability index, reduce the time and message overhead due to distribution of the retransmission communication resource and improve the communication resource utilization rate. Aggregated NACK and a resource distribution method based on ID value are utilized to obviously reduce the overhead due to ACK transmission and resource distribution information, and achieve high efficiency, low overhead, high possibility of implementing and the like.

Description

technical field [0001] The invention relates to industrial wireless network technology, in particular to an ARQ retransmission method for a factory automation wireless network based on a channel model. Background technique [0002] Industrial wireless network technology is another hot technology in the field of industrial control after fieldbus. It is a revolutionary technology that reduces the cost of industrial measurement and control systems and improves the application range of industrial measurement and control systems. It is also a new growth point for industrial automation products in the next few years. Industrial wireless network technology is oriented to short-range, low-rate information interaction between devices, suitable for use in harsh industrial site environments, and has strong anti-interference ability, ultra-low energy consumption, real-time communication and other technical features. Functional expansion and technological innovation in the direction, and...

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Application Information

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IPC IPC(8): H04L1/18
Inventor 梁炜杨雨沱于海斌张晓玲刘帅李世明
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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