Dynamic node identity implementing method and system for wireless measurement and control network based on ZigBee

Abstract

The invention discloses a dynamic node identity implementing method and a dynamic node identity implementing system for a wireless measurement and control network based on ZigBee. The method comprises the following steps of: (1) customizing serial port commands of an upper computer, wherein the serial port commands comprise C / EX**** and C / CH****; (2) storing information of other nodes in a structure form by each node in an application layer of a protocol stack; (3) if a router node receives a node identity changing command, stopping a routing forwarding function and starting acquiring data; if a terminal mode receives the node identity changing command, stopping acquiring the data and starting the routing forwarding function; and (4) respectively storing the received data information according to different source addresses through router nodes specified by the serial port commands, and when the data information from the same source address reaches for 10 times, sending the 10 pieces of data information to a coordinator at one time. By the method and the system, the reliability of the network is improved, the transmission congestion phenomenon of the network is relieved, transmission delay of the data is reduced, and energy of the nodes is saved.

Description

technical field [0001] The invention relates to a ZigBee-based wireless measurement and control network dynamic node identity realization method and system, which can be used to improve the performance of the wireless measurement and control network constructed by ZigBee technology, increase the flexibility of the entire network and reduce the overall energy consumption of the network. Background technique [0002] ZigBee technology has been widely used in various fields due to its low speed, low power consumption, and low cost. It is especially suitable for building a wireless measurement and control network. The wireless measurement and control network is composed of many miniature sensor nodes deployed in the monitoring area. Use ZigBee wireless communication technology to form all the nodes into a network, and the data collected by each node is transmitted to the host computer through the network for the user, and the user can also transmit the command to each node, which...

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Problems solved by technology

[0003] However, in the current wireless measurement and control network based on ZigBee technology, the node types include coordinator, router, and terminal equipment. There is only one coordinator in the entire network, and the router has data forwarding and routing functions. The terminal node is only responsible for collecting data and sending the data to the coordinator. , at the beginning of the network establishment, the node type is stipulated, and the user has no way to change the node type during the network operation, unless the node is reprogrammed with a new program or replaced by a new type of node

When the terminal node is too far away from all routers or the communication environment of the industrial site is too bad, the data collected by the terminal node cannot be successfully sent out, resulting in an increase in the packet loss rate, which seriously affects the reliability of the entire network

One solution is to add routers around the terminal nodes to forward the data smoothly, but this will increase the cost of building the network, which is not what we want; another method is to increase the transmit power of the nodes, although this method The packet loss rate can be reduced in a short period of time, but this will consume the energy of the nodes quickly. Places with poor communication conditions consume more energy, and places close to the coordinator and places with good communication conditions consume less energy, resulting in network energy distribution. extremely uneven

In addition, the data collected by the terminal node needs to be sent to the coordinator periodically, but the data packet only includes a few simple data, the network address and the physical address of the source node, and each time the data is different, so each terminal node needs Continuous collection and transmission will cause network communication congestion

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