Abstract
Industrial wireless networks are an important component of industrial cyber physical systems, and their transmission performance directly determines the quality of the entire system. During deployment, the nodes of an industrial wireless network can be deployed in only some specific regions due to physical environment restrictions in the factory; thus, occlusions are not always effectively circumvented and network performance is reduced. Therefore, this article focuses on the layout problem of the industrial backhaul network: a WiFi long-distance, multi-hop network. The optimization objectives were network throughput and construction cost, and the network delay was used as a constraint. For small networks, we propose a hierarchical traversal method to obtain the optimal solution, whereas for a large network, we used a hierarchical heuristic method to obtain an approximate solution, and for extremely large networks, we used a parallel interactive local search algorithm based on dynamic programming. Then, if the original network layout cannot meet the transmission demands due to traffic bursts, we propose a network bandwidth recovery method based on the Steiner tree to recover the network’s performance. Finally, the results of a simulation showed that the algorithms proposed in this article obtain an effective solution and that the heuristic algorithm requires less computing time.
Highlights
As wireless communication technology has developed, wireless technologies based on protocols such as WirelessHART,[1] WIA-PA,[2] and ISA100.11a3 have been widely applied in industrial cyber physical systems (CPS).[4]
The wireless network applied in each factory is considered a subnet of a heterogeneous network, and each subnet is connected via an industrial backhaul network[6,7] through IEEE 802.11 longdistance WiFi to constitute the wide-area heterogeneous industrial monitoring network
The optimization work.’’ We formulate the problem and provide the system model in section ‘‘System model and formulation of the problem.’’ Following the model description, two methods based on hierarchical P-median optimization model and a parallel interactive local search algorithm based on dynamic programming (PILS-DP) are proposed in section ‘‘Solutions.’’ In section ‘‘Network node deployment for traffic bursts,’’ we propose network node deployment methods for traffic bursts
Summary
As wireless communication technology has developed, wireless technologies based on protocols such as WirelessHART,[1] WIA-PA,[2] and ISA100.11a3 have been widely applied in industrial cyber physical systems (CPS).[4]. In this case, it is necessary to consider the proper locations and number of nodes, the angle of the antenna, and other factors to optimize the network bandwidth and guarantee network performance. It is necessary to consider the proper locations and number of nodes, the angle of the antenna, and other factors to optimize the network bandwidth and guarantee network performance This problem can be included in the scope of facility location. In this article, we used a network architecture based on WiLD multi-hop networks to optimize the node layout of the industrial CPS. The experimental results are given in section ‘‘Experiment and analysis.’’ section ‘‘Conclusion’’ concludes the article
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