Method and device for industrial wireless network data scheduling based on mixed critical tasks

Abstract

The present application discloses a data scheduling method for an industrial wireless network based on mixed critical tasks, including: acquiring data flow information in the network; determining a path overlapping data flow in the network that overlaps with the path of the first data flow according to the data flow information; Select the data flow of the same level as the key level of the first data flow in the path overlapping data flow; judge whether the first data flow can be scheduled if the first data flow waits for the same level data flow to arrive at the fusion node at the fusion node, if Yes, at the fusion node, the first data flow and the data flow of the same level are fused, and the fused data flow is transmitted; otherwise, the first data flow that arrives at the fusion node first is directly transmitted. The embodiment of the present invention reduces network redundancy, reduces the number of channel conflicts and transmission conflicts in industrial wireless networks, reduces the energy overhead generated by node transmission, and improves the reliability and schedulability of data streams with high critical levels .

Description

technical field [0001] The present application relates to an industrial wireless network data scheduling method and device based on mixed critical tasks, belonging to the field of industrial wireless network data scheduling. Background technique [0002] The industrial wireless network is a wireless network structure integrating detection and control composed of gateways, network controllers, and a large number of wireless sensor nodes. Compared with traditional control systems, industrial wireless networks have high reliability, flexible deployment, and low cost, so they are widely used. [0003] Reliability and real-time performance are the most important indicators of industrial wireless networks, but in the process of wireless transmission, there are two kinds of conflicts that will affect the reliability and real-time performance of data packet transmission: [0004] 1) Channel conflict: In the network, the same channel can only be allocated to one transmission link at...

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Problems solved by technology

[0003] Reliability and real-time performance are the most important indicators of industrial wireless networks, but in the process of wireless transmission, there are two kinds of conflicts that will affect the reliability and real-time performance of data packet transmission:

[0004] 1) Channel conflict: In the network, the same channel can only be allocated to one transmission link at the same time. When the channel resources cannot meet the transmission requirements, the data in the low-priority data stream will be delayed

[0005] 2) Transmission conflict: In the network, all sensor nodes are half-duplex nodes, that is, they cannot receive and send data packets at the same time during transmission, and within a time slot, the same node can only receive data packets from one source node , when multiple links use the same node at the same time, transmission conflicts will occur, and low-priority packets will be delayed

[0006] In order to ensure that nodes will not conflict, the existing technology optimizes resource allocation, or performs limited waiting without affecting schedulability. However, in order to reduce power consumption and save costs, industrial wireless networks will increasingly The different key tasks of different tasks are integrated into a shared platform, that is, there are multiple data streams of different importance in the industrial wireless network. When an accident or emergency occurs, the priority cannot ensure the schedulability of the key-level data streams. That is, there will still be conflicts affecting the reliability and real-time performance of wireless transmission

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