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Network clock synchronizing method for short distance radio communication network

A communication network and short-range wireless technology, which is applied in the field of wireless communication, can solve the problems of high-precision crystal oscillators and high prices, and achieve the effects of less resource occupation, reduced hardware costs, and easy maintenance

Inactive Publication Date: 2007-10-10
BEIJING YUDONG TECH DEV
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Problems solved by technology

One way to adjust this error is to improve the precision of the crystal oscillator, but the price of high-precision crystal oscillator is relatively high, which is obviously not suitable for the Zigbee network that emphasizes low-cost nodes. Another way is to use a better network clock synchronization method to periodically Adjust the local clock to eliminate the accumulation of errors, so that the errors are controlled within the error range allowed by the Zigbee network

Method used

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  • Network clock synchronizing method for short distance radio communication network
  • Network clock synchronizing method for short distance radio communication network

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Embodiment Construction

[0020] The network clock synchronization method of the short-range wireless communication network proposed by the present invention, firstly, the microcontroller of the coordinator in the short-range wireless communication network sends a beacon frame transmission command to the local wireless transceiver chip, and the wireless transceiver chip sends the signal to the local wireless transceiver chip after receiving the command. Send the marked frame to the general equipment, calculate the time F1 from the start of the microcontroller sending the command to the wireless transceiver chip sending the synchronization start byte in the beacon frame; the wireless transceiver chip of the general equipment receives the synchronization in the above beacon frame After the start byte, send a jump signal from low level to high level to the local microcontroller, and the local microcontroller records the current time F2 of the local clock after receiving the jump signal; the general device r...

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Abstract

First, microcontroller of coordinator in short range radio communication network sends command of sending beacon frame to local wireless send receive chip (WSRC). After receiving the command, WSRC sends beacon frame to general device, and calculates time F1 spent from the time for sending command to the time of sending synchronous start byte completely by WSRC. After receiving synchronous start byte in beacon frame, WSRC of general device sends jump signal from low electrical level to high level to local microcontroller. After receiving the jump signal, the local microcontroller records current time F2 of local clock. After receiving whole beacon frame, the general device records current time F3 of local clock. Based on F1, F2 and F3, new current time of local clock is equal to F1+ (F3-F2). Advantages are: using little resource, low hardware cost of network node, and easy of maintenance.

Description

technical field [0001] The invention relates to a network clock synchronization method of a short-range wireless communication network, in particular to a network clock synchronization method of a Zigbee network, and belongs to the technical field of wireless communication. Background technique [0002] In the Zigbee network, network nodes can be divided into two types according to different functions, one is a network coordinator, and the other is a general device. There are two modes of communication between nodes to choose from: beacon-enabled communication and beacon-disabled communication. [0003] In a communication network where beacons are not enabled, the PN coordinator does not send beacon frames, each device accesses the channel using the non-slotted CSMA / CA mechanism, and each device works according to a local clock without the existence of a network clock. [0004] In a beacon-enabled network, the network coordinator organizes communication between devices in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04B7/26
CPCH04J3/0644H04W56/00H04W56/0015H04W92/10
Inventor 董明星管勇
Owner BEIJING YUDONG TECH DEV
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