A Time Synchronization Method for Underwater Wireless Networks with Fault Tolerance
A time synchronization and wireless network technology, applied in the direction of synchronization device, wireless communication, time division multiplexing system, etc., can solve the problems of poor application, high energy consumption of the algorithm, limited precision, etc., and achieve low overhead and reception The effect of dense arrangement and high precision
Active Publication Date: 2020-11-06
NORTHWESTERN POLYTECHNICAL UNIV
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However, the existing algorithms have high energy consumption and limited accuracy, and are not well suited for resource-constrained underwater wireless networks.
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[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, and the present invention includes but not limited to the following embodiments.
[0030] In the present invention, the reference node is called the master node, and the node to be synchronized is called the slave node. When synchronization is required, the slave node must first detect whether the channel is available. When the channel is available, it will timestamp the synchronization request message to be sent and send it immediately, thus avoiding the impact of transmission delay and access delay on synchronization accuracy. Set the priority of the synchronization request to the highest, and avoid the impact of other interrupt processing on the synchronization accuracy during the process of processing the synchronization message. After the master node receives the synchronization request message, it sends a synchronization message to the slave node as...
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The invention provides an underwater wireless network time synchronization method with fault tolerance. A slave node sends synchronization request information to a mast node. After the master node receives the synchronization request information, after the received synchronization request information is timestamped, the clock frequency offset is obtained after synchronization between the master node and the slave node, the clock offset of the i-th round is estimated, the distance is normalized, the interval stamp is re-assigned after weighted calculation, the re-assigned timestamp is re-estimated, and a round of time synchronization is completed. The beneficial effect of the invention has certain fault tolerance. The invention accelerates the convergence speed of clock deviation, avoids the waste of resources caused by partial collisions by presetting parameters and updating parameters according to interactive information, and has the advantages of denser message sending and receivingarrangement, less time required for completing single synchronization, less influence of channel, higher precision, simple and effective method, small overhead, simple operation and implementability.
Description
technical field [0001] The invention relates to a time synchronization method suitable for underwater wireless networks, belongs to the technical field of self-organizing wireless sensor networks, and is suitable for underwater acoustic networks and various wireless self-organizing sensor network systems. Background technique [0002] Time synchronization is a supporting technology and a necessary prerequisite for wireless sensor networks. In a distributed system such as wireless sensor networks, functions such as power management, data fusion, location tracking, security protocols, and transmission scheduling require high time synchronization accuracy. , so time synchronization between different nodes is a problem that cannot be ignored. In a wireless sensor network, each sensor node has its own local time, which is determined by the crystal oscillator and counter inside the node. However, small differences in materials and manufacturing of crystal oscillators cannot be av...
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IPC IPC(8): H04W56/00H04J3/06H04B13/02
CPCH04B13/02H04J3/0661H04W56/0015H04W56/003
Inventor 申晓红孙旋迪姚海洋王海燕
Owner NORTHWESTERN POLYTECHNICAL UNIV