Precise time service transmission method and device applied to wireless local area network

A technology of wireless local area network and transmission method, which is applied in the field of network timing and can solve problems such as time synchronization performance degradation

Active Publication Date: 2019-07-23
COMMUNICATION UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using a high-precision network time synchronization protocol in a wireless LAN, there will be random delays, resulting in a significant decrease in time synchronization performance

Method used

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  • Precise time service transmission method and device applied to wireless local area network
  • Precise time service transmission method and device applied to wireless local area network
  • Precise time service transmission method and device applied to wireless local area network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] see figure 2 , figure 2 It is a schematic flowchart of a precise timing transmission method applied in a wireless local area network provided by Embodiment 1 of the present application. In this embodiment, the interaction between the master station and the slave station is taken as an example to describe the precise timing transmission method applied in the wireless local area network in this embodiment.

[0096] Such as figure 2 As shown, the precise timing transmission method applied in the wireless local area network provided by this embodiment includes:

[0097] Step 201, the master station sends a first CTS command to clear the channel between the master station and the slave stations;

[0098] Step 202, the master station uses a dedicated timing frame to send SYNC information data to the slave station;

[0099] Step 203, the master station records the first moment of sending SYNC information data;

[0100] Step 204, receiving SYNC information data from the...

Embodiment 2

[0120] see image 3 , image 3 It is a schematic flowchart of a precise timing transmission method applied in a wireless local area network provided by Embodiment 2 of the present application. In this embodiment, the implementation at the master station side is taken as an example to describe the precise timing transmission method applied in the wireless local area network.

[0121] Such as image 3 As shown, the precise timing transmission method applied in the wireless local area network provided by this embodiment includes:

[0122] Step 301, sending the first CTS command to clear the channel between the master station and the slave station;

[0123] Step 302, sending the SYNC information data to the slave station and recording the first moment when the master station sends the SYNC information data;

[0124] Step 303, sending the first moment to the slave station;

[0125] Step 304, receiving the RTS command sent by the slave station, and responding to the second CTS ...

Embodiment 3

[0142] see Figure 4 , Figure 4 It is a schematic flowchart of a precise timing transmission method applied in a wireless local area network provided by Embodiment 3 of the present application. In this embodiment, the implementation at the slave station side is taken as an example to illustrate the precise timing transmission method applied in the wireless local area network.

[0143] Such as Figure 4 As shown, the precise timing transmission method applied in the wireless local area network provided by this embodiment includes:

[0144] Step 401, receiving the SYNC information data sent by the master station after sending the first CTS command to clear the channel, and recording the second moment when the slave station receives the SYNC information data;

[0145] Step 402, receiving the first moment sent by the master station; the first moment is the moment when the master station sends SYNC information data;

[0146] Step 403, sending an RTS command to the master stati...

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Abstract

The invention relates to a precise time service transmission method and device applied to a wireless local area network, and the method comprises the steps: sending a first CTS instruction so as to empty a channel between a master station and a slave station; sending SYNC information data to the slave station and recording a first moment when the master station sends the SYNC information data; sending the first moment to the slave station; receiving an RTS instruction sent by the slave station, and responding a second CTS instruction to the slave station; receiving DELAY REQUSEST information sent by the slave station, and recording the fourth moment when the master station receives the DELAY REQUSEST information; sending the fourth moment to the slave station, so that the slave station calculates the path transmission delay and the clock offset of the master station slave station according to the first moment, the second moment, the third moment and the fourth moment, and then correctsthe clock of the slave station; wherein the second moment is the moment when the slave station records and receives the SYNC information data; wherein the third moment is the moment when the slave station sends DELAY REQUSEST information. The first CTS instruction is sent, and the channel between the master and the slave is emptied, so that the random delay caused by busy channels is reduced, andthe accuracy and the performance of time synchronization are improved.

Description

technical field [0001] This application relates to the technical field of network timing, and in particular designs a precise timing transmission method and equipment applied to wireless local area networks. Background technique [0002] Most wireless LAN systems use carrier sense multiple access / collision avoidance (Carrier Sense Multiple Access with Collision Avoidance, CSMA / CA) for channel competition and data transmission, and the data transmission delay jitter is largely determined by the jitter of the competitive acquisition channel . [0003] When using a high-precision network time synchronization protocol in a wireless local area network, random delays will occur, resulting in a significant decrease in time synchronization performance. Contents of the invention [0004] In order to overcome the problems existing in the related technologies at least to a certain extent, the present application provides a precise timing transmission method and equipment applied in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00
CPCH04W56/0015H04W56/003
Inventor 李正祥邓纶晖杨占新
Owner COMMUNICATION UNIVERSITY OF CHINA
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