Large-scale wireless sensor network time synchronizer based on clock frequency dynamic detection

A wireless sensor and clock frequency technology, which is applied in wireless communication, synchronization devices, electrical components, etc., can solve the problem that the clock frequency is prone to sudden changes, and achieve the effect of ensuring reliability and reducing multi-hop accumulation

Inactive Publication Date: 2014-10-15
SHANDONG UNIV
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Problems solved by technology

[0004] In order to effectively solve the problem that the clock frequency is prone to mutations in large-scale networks, suppress the phenomenon of serious multi-hop accumulation of synchronization errors, an...

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  • Large-scale wireless sensor network time synchronizer based on clock frequency dynamic detection
  • Large-scale wireless sensor network time synchronizer based on clock frequency dynamic detection
  • Large-scale wireless sensor network time synchronizer based on clock frequency dynamic detection

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Embodiment Construction

[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] The invention is a large-scale wireless sensor network time synchronizer based on clock frequency dynamic detection. By observing the clock frequency status in real time, when the node frequency suddenly changes, it can be tracked quickly. At the same time, through the node clock information, a relatively better synchronization path is selected to suppress the multi-hop accumulation of synchronization errors. And for the failure of the root node and the failure of ordinary nodes, corresponding solutions are provided respectively, and high synchronization accuracy and strong robustness are obtained in a large-scale network.

[0042] to combine figure 1 , the process of the large-scale wireless sensor network time synchronizer of the present invention goes through the following steps successively:

[0043] (1) Root node elect...

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Abstract

The invention brings forward a large-scale wireless sensor network time synchronizer based on clock frequency dynamic detection. A rapid tracking strategy is performed on the abruptly changed clock frequency nodes via statistic analysis of clock frequency data so that the nodes are ensured to monitor the clock frequency state in real time. A multi-hop path selection mechanism is adopted, and a synchronization path with great quality is simply and rapidly selected so that a synchronization error multi-hop accumulation phenomenon is effectively inhibited and synchronization precision is enhanced. Strategies of root node reselection and level information periodic updating are respectively adopted by aiming at the situation of failure of root nodes and common nodes in a large-scale wireless sensor network.

Description

technical field [0001] The invention belongs to the field of time synchronization between wireless sensor network nodes. Background technique [0002] Wireless sensor networks (Wireless Sensor Networks, WSNs) are composed of a large number of nodes. With the continuous increase of the network scale, the clock frequency is prone to sudden changes, and the cumulative error has a serious impact on the synchronization accuracy. According to the way of sending and receiving synchronization messages, WSNs time synchronization models are mainly divided into three categories: sender-receiver-based two-way synchronization model, sender-based one-way synchronization model and receiver-receiver-based synchronization model. The existing WSNs time synchronization mechanism does not provide a corresponding solution to the possible mutation of the clock frequency. Once the clock frequency changes suddenly and the historical data is not cleared in time, this will lead to a sharp increase i...

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Application Information

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IPC IPC(8): H04W56/00
Inventor 董恩清宋杰邹宗骏袁瑗黄振强高翔
Owner SHANDONG UNIV
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