A monitoring clock synchronization method among nodes in a wia-pa network

Abstract

The invention provides a method for monitoring-type time synchronization among cluster nodes in a WIA-PA network. The method includes steps of aiming at common sensor nodes in WIA-PA network clusters, adopting a beacon frame broadcasting mechanism maintaining system basic time synchronization; aiming at nodes with comparatively high precision requirements, calculating a command frame time synchronization period of each node and finding the node with the minimum synchronization period, performing command frame time synchronization on the node with the minimum synchronization period and a cluster head while performing time synchronization on the node with the non-minimum synchronization periods after expansion of a WIA-PA network layer command request frame format, designing a special time synchronization monitoring request frame, requesting information such as a super-frame table, a LINK table, a keyword and the like of the node with the minimum period and monitoring command frame time synchronization information between the node with the minimum period and the cluster head based on the above information. Finally, whole network synchronization is realized. Sending quantity of time synchronization relating messages is reduced, time synchronization cost is reduced, resource consumption is reduced and energy of limited sensor nodes of WIA-PA network resource is saved.

Description

technical field [0001] The invention belongs to the technical field of wireless network communication, in particular to a clock synchronization method in a WIA-PA network. Background technique [0002] The industrial wireless network WIA-PA specification is a technical specification with independent intellectual property rights launched by the China Wireless Industry Alliance. A two-layer network topology structure combining star network and mesh network structure is adopted. The first layer is a mesh structure, which is composed of gateways and routers; the second layer is a star structure, which is mainly composed of routers and terminal devices. Routers It is the cluster head of the star network, and the terminal devices are members in the cluster. The data link layer of WIA-PA supports time-slot-based frequency hopping mechanism, retransmission mechanism, TDMA and CSMA mixed channel access mechanism, which ensures the reliability and real-time performance of transmissio...

AI Technical Summary

Problems solved by technology

[0004] At present, the main problems in the WIA-PA network time synchronization mechanism are as follows: First, the command frame time synchronization is an effective strategy to solve the synchronization of nodes with higher time precision, but when there are multiple nodes with higher application precision requirements in the cluster, The number of time synchronization command frames that the cluster head needs to send increases sharply, which greatly consumes energy and communication resources. At the same time, the battery-powered resource-limited sensor sub-nodes are not enough to support frequent sending and receiving of command frames (when the nodes send and receive messages, Radio frequency consumes the largest proportion of energy, especially for the energy saving of energy-constrained nodes in the network)

Second, the WIA-PA standard does not have a unified cognition and standard representation of monitoring attribute information, and there is no special time synchronization monitoring request frame and monitoring request response frame designed.

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