Router, wireless sensing network and method for monitoring terminal node

Abstract

The invention relates to a router, a wireless sensing network and a method for monitoring a terminal node. The router is applied to the wireless sensing network and comprises a routing module, a wakening module and a nonvolatile memory. The wakening module is connected with the routing module for wakening the routing module in a dormant state periodically. The routing module also comprises a command receiving unit for receiving a command from a superior node after the routing module is wakened and judging whether the wakened routing module is commanded to be in an active state or dormant continuously according to the received command. The nonvolatile memory is connected with the routing module for storing the networking topological information of the wireless sensing network of the router and information of superior and inferior nodes of the router. The information is invoked after the routing module is wakened and in an active state.

Description

technical field [0001] The invention relates to the field of wireless sensor networks, in particular to a router, a wireless sensor network and a method for monitoring terminal nodes. Background technique [0002] With the development of wireless communication technology and sensing technology, the application of wireless sensor network has become more and more common. ZigBee is a communication protocol mainly used in wireless sensor networks. It can work in three frequency bands of 2.4GHz (popular in the world), 868MHz (popular in Europe) and 915 MHz (popular in the United States). 20kbit / s and 40kbit / s transmission rate, its transmission distance is in the range of 10-75m, but can continue to increase. [0003] As a kind of wireless communication technology, the main characteristic of the wireless sensor network based on ZigBee agreement lies in low power consumption and low cost. In terms of power consumption, due to the low transmission rate of the ZigBee protocol, the...

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Problems solved by technology

[0006] The disadvantage of using wired power supply is that it will turn the wireless sensor network based on the ZigBee protocol into a wired network, which will not reflect the flexible advantages of the wireless sensor network

The distance between the nodes of the wireless sensor network based on the ZigBee protocol is generally several meters to tens of meters. If all routers and coordinators need to use wired power supply, the dense power lines like spider webs will make the wireless sensor network based on the ZigBee protocol The sense network becomes a disgusting product, which is difficult for users to accept

[0007] TI and Germany's Micropelt jointly launched a new energy ZigBee protocol node using Micropelt's thermoelectric generator to provide power for TI's ZigBee protocol router. The disadvantage of this technical solution is that the new type of thermoelectric generator is expensive and will Fully offset the low-cost advantages of wireless sensor networks based on the ZigBee protocol

In addition, thermoelectric generators are only suitable for environments with severe alternation of cold and heat, and most applications cannot use thermoelectric generators

[0008] The disadvantage of using solar batteries to power the wireless sensor network based on ZigBee protocol is that the price of solar panels and batteries far exceeds the price of wireless sensor network nodes based on ZigBee protocol, and many applications cannot guarantee sufficient sun exposure

[0009] The disadvantage of using ultra-high-energy special batteries to power wireless sensor networks based on the ZigBee protocol is that ultra-high-energy special batteries are very expensive, and only a few occasions regardless of cost will use this solution

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