Directional beam based wireless network master-slave synchronization method
A directional beam, wireless network technology, applied in the directions of synchronization devices, wireless communication, electrical components, etc., can solve problems such as network synchronization protocols based on directional communication methods that have not yet been proposed
Inactive Publication Date: 2017-02-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0003] In the existing research work on the network-wide synchronous directional access protocol, researchers usually assume that the nodes of the entire network have been synchronized through the global positioning system, or the network synchronization protocol based on omni-directional communication, and has not yet proposed a method based on directional communication. net synchronization protocol
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[0012] The present invention will be further described in detail below with reference to the drawings and embodiments.
[0013] The wireless network master-slave synchronization method based on directional beams proposed by the present invention sets the following network operating conditions:
[0014] 1. Each node in the network installs 6 antennas to achieve front, back, up, down, left and right airspace coverage, and each antenna covers an airspace of 120°;
[0015] 2. Each antenna of the node contains M beams, the value of M is determined by the beam width, and each antenna can only generate one beam at the same time;
[0016] 3. The 6 antennas of the node can work at the same time, that is, 6 beams can be generated at the same time;
[0017] 4. The node can work in both omnidirectional mode and directional mode. The omnidirectional working mode is used for omnidirectional monitoring channel and omnidirectional receiving data, and the directional working mode is used for directional...
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The invention discloses a directional beam based wireless network master-slave synchronization method. The directional beam based wireless network master-slave synchronization method comprises the steps of regarding a node which initiates time synchronization in the network as a master node; correspondingly regarding nodes synchronized with the master node as slave nodes; dividing a master-slave synchronization process into a coarse synchronization stage and a fine synchronization stage based on characteristics of directional beam transmission. In the coarse synchronization stage, the master node initiates a synchronization process through directional broadcasting of a coarse synchronization frame; and in the fine synchronization stage, clock slew of the slave nodes and the master node which receive the coarse synchronization frame successfully is removed through directional interaction between a fine synchronization request frame and a fine synchronization response frame, and the time synchronization is realized. After time synchronization of the slave nodes and the master node is finished, each slave node which serves as a master node broadcasts the coarse synchronization frame directionally to neighbor nodes and initiates the synchronization process for the neighbor nodes to further realize time synchronization among all the nodes in the network. The validity of the method is proved by a simulation experiment in the wireless network simulation environment EXata.
Description
Technical field [0001] The invention belongs to the field of wireless networks, and particularly relates to a master-slave synchronization method of a wireless network based on a directional beam. Background technique [0002] Node synchronization is the primary problem that must be solved to achieve synchronized directional access across the entire network. Although the global positioning system can provide time synchronization for network nodes, due to the unreliability of GPS signals in certain wireless network environments, such as battlefield confrontation environments, the network must have the ability to achieve network synchronization by itself. According to the different synchronization initiation methods, the existing network synchronization protocol can be divided into two types: mutual synchronization and master-slave synchronization. Among them, the former adopts a method in which nodes randomly compete to send synchronization beacon frames to achieve distributed ne...
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IPC IPC(8): H04W56/00
CPCH04W56/0015
Inventor 雷磊蔡圣所赵昕茹王夏楠李志林沈高青
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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