A Method for Time Synchronization Between Nodes in Wireless Ad Hoc Network

Abstract

The invention provides a method for time synchronization between nodes in a wireless Ad Hoc network. The method comprises: a, monitoring synchronization time marks of other nodes by a node A, turning to b if the synchronization time marks of other nodes are monitored, otherwise, turning to e; b, if the fact that a synchronization source priority is high than the priority of the node is monitored, adjusting local time according to monitored information, resetting the synchronization source priority, and turning to e, otherwise, turning to c; c, calculating a time deviation between each synchronization time mark and the local time, turning to d if the time deviation is greater than or equal to a preset threshold, otherwise, turning to e; d, adjusting the local time according to each monitored synchronization time mark, sending a synchronization adjustment request to a source node, adjusting the local time by each source node according to the request, recovering original local time of the node A, and turning to e; and e, sending the synchronization time marks to the other nodes by the node A. Through adoption of the method, time synchronization between the nodes can be achieved without unified coordination of a center control node, and efficiency of the time synchronization between the nodes is improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method for time synchronization between nodes in a wireless ad hoc network. Background technique [0002] Wireless ad-hoc network is a special wireless mobile communication network. There is no central control node in the network, and all nodes are equal in status and distributed. Each node not only has the communication function of ordinary mobile terminals, but also has the function of message forwarding. Function, when the source node and target node of the communication are not in the direct communication range, the message can be forwarded through the intermediate node for communication. In this network, if multiple nodes have communication needs at the same time, due to the lack of coordination of the central control point, two or more nodes may send data at the same time at the same time, thus sending conflicts. To resolve this conflict, the node can send a detecti...

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Problems solved by technology

[0003] However, the inventors found that when the wireless network is initialized (the nodes in the network are uniformly turned on and connected to the network), the equipment of the node is restarted due to a crash or power failure, or the local area wireless ad hoc network with two inconsistent time bases is caused by the movement of the nodes in the respective networks. When meeting and merging, because there is no central control node in the wireless ad hoc network for unified coordination, the time between each node may be asynchronous, and the nodes in the two local wireless ad hoc networks with inconsistent time bases may The time deviation is too large, and the nodes cannot receive synchronization related information within the monitoring time, resulting in the nodes not being able to synchronize at all

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