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A low-latency clock synchronization method for zigbee based on cross-technology communication

A clock synchronization and technical communication technology, applied in wireless communication, synchronization devices, electrical components, etc., can solve the problems of WiFi nodes occupying channels, WiFi nodes cannot distinguish ZigBee signals, interfere with ZigBee communication, etc., and achieve the effect of precise global clock synchronization

Active Publication Date: 2021-10-01
NANJING FORESTRY UNIV
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Problems solved by technology

Since WiFi nodes cannot distinguish ZigBee signals, and because WiFi signals work in the same ISM frequency band and channel with ZigBee nodes, WiFi signals interfere with ZigBee communication, which indicates that ZigBee nodes cannot communicate with other devices and WiFi nodes occupy the channel

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  • A low-latency clock synchronization method for zigbee based on cross-technology communication
  • A low-latency clock synchronization method for zigbee based on cross-technology communication
  • A low-latency clock synchronization method for zigbee based on cross-technology communication

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Embodiment Construction

[0042] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0043] The present invention designs a ZigBee low-delay clock synchronization method based on cross-technology communication, which is used to realize the synchronization between the corresponding time slots of each ZigBee node. In practical applications, WiFi nodes are used, and the time slots corresponding to WiFi nodes are defined. The length and the length of the time slot corresponding to the ZigBee node are equal to each other.

[0044] During the synchronization process, the WiFi nodes correspond to the starting time of each time slot, and broadcast the time stamps composed of their clock signals; each ZigBee node receives the time stamps broadcast from the WiFi nodes based on the listening state; the received time stamps The ZigBee nodes of the network then use their clocks for timing, execute their corresponding...

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Abstract

The present invention relates to a ZigBee low-delay clock synchronization method based on cross-technology communication. A new synchronization design method is adopted to realize the synchronization between time slots corresponding to each ZigBee node. The ZigBee node starts timing after receiving the timestamp, and the length of the time slot corresponding to each ZigBee node is equal to the length of the time slot corresponding to the WiFi node to realize the synchronization between the time slots corresponding to each ZigBee node; so that the current time synchronization time error is reduced by nearly 1 The millisecond is increased to about 200 microseconds, and the current timestamp transmission time takes about 800 microseconds, so the proposed clock synchronization method can achieve more accurate global clock synchronization.

Description

technical field [0001] The invention relates to a ZigBee low-delay clock synchronization method based on cross-technology communication, which belongs to the technical field. Background technique [0002] In a wireless network, due to different oscillation frequencies, different clocks beat at different rates, and network devices have their own internal clocks and time concepts. Time synchronization is a method that allows entities in a group to synchronize their clocks relative to each other or to some coordinated common time. Unlike traditional wired networks (such as the Internet and local area networks) that use the Global Positioning System or Network Time Protocol to achieve time synchronization through the network, for wireless networks, due to the limited energy supplement, the cost of global time synchronization is high, and nodes do not start Be sure to stay in sync at all times. Currently, there is no global clock or common time for distributed systems in wirele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00
CPCH04W56/001
Inventor 高德民张朔
Owner NANJING FORESTRY UNIV
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