Clock synchronization method and device

Abstract

The invention provides a clock synchronization method and device. The clock synchronization method comprises the steps of distributing a node number for each node in a network and determining a clock reference node in the network based on the node number of each node; carrying out time slot number correction for rest nodes in the network based on the time slot number information of the clock reference node so as to finish synchronization of the time slots of the nodes in the network; carrying out clock synchronization for the rest nodes in the network based on a round-trip delay correction mechanism and the clock counter information of the clock reference node so as to finish synchronization of clocks of the nodes in the network; and obtaining a timed correction time pre-set for the nodes and correcting the clock counter of each node periodically based on the timed correction time. The clock synchronization method reduces synchronization error caused by broadcasting delay and processing delay, corrects the difference of the clock frequencies inside each node, reduces expense of the network clock synchronization, enables the network to be in a synchronous state rapidly, improves the clock synchronization precision and keeps a relatively steady synchronous state.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a clock synchronization method and device. Background technique [0002] Ad-hoc networks are also called multi-hop wireless networks and self-organizing networks. Ad-hoc networks have three main features: self-organization, peer-to-peer, and multi-hop. Self-organization means that the Ad-hoc network does not depend on the preset basic network facilities. Peer-to-peer means that it has no central node and all nodes have equal status. Nodes communicate. Ad-hoc network is a kind of dynamic network, the state of nodes in the network is changing dynamically, it does not depend on infrastructure, does not need base stations, can form a network by self-organization, and has strong invulnerability, so it is used in military It has better performance in harsh environment and other conditions. [0003] When the Ad-hoc network is started, there is an offset between the cl...

AI Technical Summary

Problems solved by technology

This method is less affected by the cumulative delay and network topology changes, but in general, each synchronization requires a round-trip communication between neighboring nodes, and the convergence speed is slow when the network scale is large

[0008] The two types of algorithms have their own advantages and disadvantages, but the pure master-slave synchronization algorithm and mutual synchronization algorithm cannot meet the requirements of Ad-hoc networks for clock synchronization accuracy and synchronization algorithm overhead

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