Wireless sensor network synchronization method based on dynamic path and variable period
A wireless sensor and network synchronization technology, applied in the direction of synchronization devices, wireless communication, multiplexing communication, etc., can solve the problems of multi-hop error accumulation, variable node clock frequency, high energy consumption of nodes, etc., to improve synchronization accuracy, Save energy and suppress the effect of multi-hop accumulation
Active Publication Date: 2018-10-26
山东知微智成电子科技有限公司
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[0004] Aiming at the problems of serious accumulated multi-hop errors, changeable node clock frequency, and high energy consumption of nodes in existing large-scale wireless sensor networks, the present invention provides a wireless transmission system based on dynamic path (Dynamic Path) and variable period (VariablePeriod). Sense Network Time Synchronization Method
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[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0037] The invention is a wireless sensor network synchronization method based on a dynamic path and a variable period. The network topology structure of regional clustering is adopted during synchronization, which can not only reduce the maximum synchronization hops of the network, but also improve the network synchronization accuracy. In the inter-cluster synchronization phase, a multi-hop synchronization mechanism based on dynamic paths is adopted. Each round of synchronization selects neighbor cluster head nodes with good performance as reference nodes according to the performance parameters related to the number of synchronization hops and clock frequency offset. By dynamically selecting the synchronization path, it can effectively Reduce multi-hop cumulative error. In the intra-cluster synchronization stage, a variable-period sy...
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The invention discloses a wireless sensor network synchronization method based on a dynamic path and a variable period. The method comprises steps of clustering, synchronizing cluster head nodes, synchronizing nodes in a cluster, expanding a network and so on. Hop count maximum of nodes is lowered overall by using a topological structure of clusters, so as to improve node accuracy; when multiple hops exist between clusters, a neighbor cluster head node with small hop count and stable clock frequency is used as a reference node by using a dynamic path mechanism, so that synchronization errors are prevented from accumulating; in the intra-cluster synchronization stage, the protocol adopts a variable period mechanism, thereby eliminating the impact of clock frequency change on synchronizationaccuracy, and saving energy while guaranteeing accuracy. Waiting time for reference node selection, network allowable maximum synchronization error value, and synchronization period limit value can be adjusted according to requirements on synchronization accuracy, energy consumption and convergence in actual application, so as to meet demands in different application scenes.
Description
technical field [0001] The invention belongs to the field of time synchronization among wireless sensor network nodes, and in particular relates to a wireless sensor network synchronization method based on dynamic path and variable period. Background technique [0002] Wireless Sensor Networks (WSNs) is a multi-hop self-organizing network formed by a large number of sensor nodes with information collection, processing and wireless transmission capabilities. It has great application prospects in military, environmental monitoring, smart home and other fields. Time synchronization technology is an important key technology in wireless sensor networks, which provides a unified time measurement for the entire network nodes. Many basic operations and applications in wireless sensor networks require time synchronization, such as low-power MAC protocol, data fusion , positioning technology, etc. Since the time synchronization technology of wireless sensor networks was proposed, man...
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IPC IPC(8): H04W40/32H04W56/00H04J3/06
CPCH04J3/0638H04W40/32H04W56/001Y02D30/70
Inventor 董恩清仝锡林常树旺张德敬
Owner 山东知微智成电子科技有限公司