Low-energy consumption sleeping monitoring method synchronous relative to time of wireless sensor network

Abstract

The invention relates to a low-energy consumption sleeping monitoring method synchronous relative to time of a wireless sensor network. The traditional method is high in energy consumption. The method in the invention comprises the following steps: in the stage of creating a relative synchronization table at a new node, broadcasting addition request network packets by the new node firstly to obtain synchronizing information of a neighbourhood node; then estimating clock skew, and linearly fitting multigroup of synchronization information of the neighbourhood node to estimate clock drift; and finally saving the sleeping period of the neighbourhood node, the estimated clock skew and the clock drift into the relative synchronization table; and in the stage of prediction and transmission of data packets of the node, realizing relative synchronization with a target node by the node according to the created relative synchronization table, then predicting the waking time at the next time according to the sleeping period of the node, setting a transmission timer, and finally transmitting data packets by a short permeable when the transmission timer is triggered. According to the invention, the energy overhead for sending the data packets by the node can be saved, and the idle time of a transmitting node is reduced, and the sleeping time of the transmitting node is increased.

Description

technical field [0001] The present invention relates to the technical field of energy saving of wireless sensor networks, in particular to a low energy consumption sleep listening method of relative time synchronization of wireless sensor networks. Background technique [0002] Wireless sensor network is composed of a large number of small sensor nodes deployed in the monitoring area. It is a distributed self-organizing network integrating data acquisition, processing, fusion, transmission and communication functions. With the maturity of wireless sensor network standards, the rapid development of its related technologies, and the continuous improvement of sensor node fabrication technology, wireless sensor networks have been used in more and more fields, not only for general environmental monitoring, data collection, Such as greenhouse environmental monitoring, ecological area environmental monitoring, animal and plant habit monitoring, etc., and can be used in fields with ...

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Problems solved by technology

[0008] The advantage of this method is that it realizes a certain degree of on-demand sleep and wake-up, and the sleep efficiency of nodes without data packet sending and receiving requirements is very high, and the energy saving is obvious. The disadvantage is that the sender needs to send an extra long wake-up preamble, thus consume more energy

[0010] However, because it adopts the global synchronization method to realize the synchronous sleep wake-up mechanism, there is a phenomenon that the deeper the layer number is, the lower the synchronization accuracy of nodes is in the wireless sensor network with many network layers, which affects the length of the short preamble; in the specific In the application, in order to improve the synchronization accuracy of nodes, nodes have to increase the number of times dedicated synchronization packets are sent, thereby increasing communication energy consumption

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