Time synchronization method and apparatus for wireless ad-hoc network

Abstract

The embodiments of the invention provide a time synchronization method and apparatus for a wireless ad-hoc network, and are applied to a first node in a wireless ad-hoc network. The method provided by one concrete embodiment of the invention comprises the following steps: in an interception period of a current synchronization period, monitoring whether first synchronization signals from other nodes are received, wherein any one node in the wireless ad-hoc network in each synchronization period successively goes through a waiting period, a signal sending period, a no-response period and an interception period; if so, adjusting a current phase of the first node according to the first synchronization signals, if the phase reaches a threshold after adjustment, setting the phase to zero, entering the waiting period of the next synchronization period in advance, and preparing to send synchronization signals; and otherwise, controlling linear increase of the phase, and when the phase is increased to the threshold, entering the waiting period of the next synchronization period. According to the embodiments of the invention, high-precision time synchronization in the wireless ad-hoc network can be realized.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a time synchronization method and device for wireless ad hoc networks. Background technique [0002] Compared with the traditional cellular network, the wireless ad hoc network does not have a central controller, and all nodes operate in a distributed manner, without relying on the existing fixed communication network infrastructure, and can be used quickly with less manual intervention. equality. Each network node cooperates with each other, communicates and exchanges information through wireless links, and realizes the sharing of information and services. Network nodes can enter and leave the network dynamically, freely, and frequently without warning or notification in advance, and without It will disrupt the communication of other nodes in the network. Therefore, it has good fast networking and anti-destruction performance, and is suitable for working in an e...

AI Technical Summary

Problems solved by technology

However, the time synchronization technology using the firefly algorithm has the following disadvantages: in a wireless network, a single pulse signal cannot be monitored, and at the same time, it is difficult for the existing technology to shrink the signal into an infinitely short pulse in time; For wireless channel transmission, when the distance between nodes is large, the propagation delay cannot be ignored. It is impossible for the node to receive the signal immediately after the sending end sends the signal; the receiving end needs time to perform the analysis operation after receiving the signal , and it is impossible to complete the corresponding operation instantaneously

This limits the application of the firefly time synchronization algorithm in wireless ad hoc networks

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