Industrial wireless sensor network communication method based on relay nodes

Abstract

The invention relates to an industrial wireless sensor network communication method based on relay nodes, belonging to the field of sensor network communication. A network management center distributes a preferred communication path resource according to the request of a source node and current network state information, selects a relay node and a relay path according to constraint conditions, and distributes the communication resources of the relay path. In the communication process, when the relay node receives the negative response from the node of the last hop, the probability that the transmission delay exceeds a threshold is reduced, the frequency of retransmission initiated by the source node is reduced, and the energy consumption for retransmitting data is reduced. Meanwhile, the relay node also dynamically changes the priority of data packets, avoids delaying transmission of the data packets again, and ensures that the data packets reach a destination node in delay requirements. By adopting collaboration among the relay node, the destination node and the network management center, the packet loss rate is reduced, the frequency of retransmission initiated by the source node is reduced, and the energy consumption for retransmitting data is reduced.

Description

technical field [0001] The invention relates to industrial wireless sensor networks, in particular to cooperative communication technology in the field of industrial wireless sensor network communication. technical background [0002] Industrial wireless sensor network is the latest application field of wireless sensor network technology, which has remarkable characteristics compared with sensor network. First of all, the industrial wireless sensor network standard that is being formulated, starting from the needs of industrial field applications, adopts a centralized (such as ISA100) or a hybrid network management (WIA-PA) that combines centralized and decentralized to strictly control the communication between nodes. management. Secondly, the working environment of industrial wireless sensor networks is complex. In addition to various communication interferences, there are also restrictions on the working space and communication interruptions between nodes caused by vario...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the relay node technology used in the existing wireless sensor network fails to address the technical characteristics of the industrial wireless sensor network. When both the relay node and the source node receive a retransmission request, it is easy to cause conflicts in simultaneous transmission of nodes, Problems such as excessive energy consumption and distributed cooperative transmission cause node load imbalance, provide a communication method for industrial wireless sensor networks based on relay nodes, and improve the real-time performance and reliability of industrial wireless sensor networks

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