Industrial wireless network data scheduling method and apparatus based on the mixture of key tasks

Abstract

The invention discloses an industrial wireless network data scheduling method based on the mixture of key tasks. The method comprises: obtaining the data stream information of a network; according to the data stream information, determining the data streams in the network whose paths are superposed with the path of a first data stream; choosing from the data streams whose paths are superposed with the path of the first data stream the level-identical data stream sharing the same key level as the first data stream; determining whether the first data stream can be scheduled or not if the first data stream awaits at an integration node until the arrival of the level-identical data stream to the integration node; if the first data stream can be scheduled, integrating at the integration node the first data stream with the level-identical data stream and transmitting the integrated data stream; and otherwise, directly transmitting the first data stream that reaches the integration node in advance. The embodiments of the invention reduce the network redundancy, the number of channel conflicts and transmission conflicts in an industrial wireless network and at the same time, the energy overhead generated from node transmission. The method and apparatus also make the data stream with high key level more reliable and more scheduling.

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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