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A Time Synchronization Method Applicable to Time Division Multiplexing Carrier Transmission System Bus

A technology of carrier transmission and time synchronization, which is applied in the field of communication, can solve problems such as difficult time synchronization, and achieve the effect of improving accuracy

Active Publication Date: 2021-07-02
武汉居易微电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the method, the problem of difficulty in establishing time synchronization in the carrier transmission system in the prior art is overcome, and the accuracy of the synchronization time of the slave node is improved during operation.

Method used

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  • A Time Synchronization Method Applicable to Time Division Multiplexing Carrier Transmission System Bus

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Embodiment 1

[0025] Such as figure 1 As shown, a time synchronization method suitable for the time division multiplexing carrier transmission system bus, the slave node obtains the synchronization signal sent by the master node at regular intervals, the local time corresponding to the arrival time of the synchronization signal and a time compensation amount of propagation delay to correct the set of the local time at the current moment of the synchronization signal to form a closed-loop method for self-updating the synchronization time of the slave node.

[0026] Further, the synchronization signal is an OFDM signal.

[0027] Further, obtaining the time compensation amount of the propagation delay includes the following steps:

[0028] The slave node sends a signal to the master node according to the allocated gap, and obtains the arrival of the signal

[0029] the local time of the moment of said master node;

[0030] Comparing the local time at the moment of arrival at the master node...

specific Embodiment approach

[0037] A time-division multiplexing carrier transmission system bus contains 1 master node and 98 slave nodes, a frame cycle every ten milliseconds, divided into 100 time slots, each time slot is 0.1 milliseconds in length, numbered from 0 to 99 . Among them, time slot No. 0 is used for the master node to send synchronization signals, and the other 99 time slots correspond to 99 nodes one by one.

[0038] The entity related to the synchronization time of the master node is a clock source with a nominal value of 10 MHz and a corresponding modulo 100,000 counter.

[0039] The entity related to the synchronization time of each slave node is a clock source with a nominal value of 10 MHz and a corresponding modulo 100,000 counter, register A and register B. Among them, register A stores the local time when the latest synchronization signal arrives at the node, that is, the count value of the modulo 100,000 counter of the slave node, and register B stores the estimated value of the...

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Abstract

The invention discloses a time synchronization method suitable for a time division multiplexing carrier transmission system bus. A slave node acquires a synchronization signal regularly sent by a master node, and corrects the synchronization signal through the arrival time of the synchronization signal and a time compensation amount of a propagation delay. A collection of the local time at the time of arrival of the synchronization signal to form a closed-loop method for self-renewal of the synchronization time of the slave node. The invention overcomes the problem that it is difficult to establish time synchronization in the carrier transmission system in the prior art, and improves the accuracy of the synchronization time of the slave nodes during operation.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a time synchronization method suitable for a time-division multiplexing carrier transmission system bus. Background technique [0002] Bus communication is to use wired cables as the physical transmission medium for information transmission, which has the advantages of simple system layout, reliable information transmission and low system cost. [0003] The hardware of the bus system consists of the physical transmission medium and several communication nodes. The former generally consists of a set of cables and matching connectors. Multiple communication nodes share the same transmission medium, so time-division multiplexing is often used, that is, at any one time, there is at most one node for signal transmission. Time division using centralized control needs to establish time synchronization of the whole system, so time synchronization technology is one of the core tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J3/06
CPCH04J3/0682
Inventor 沈业兵姚飞史永东
Owner 武汉居易微电子有限公司
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