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High-precision clock synchronization method and system for communication equipment

A high-precision clock and communication equipment technology, applied in time-division multiplexing systems, synchronization devices, wireless communications, etc. Insufficient board terminals and other problems can be achieved to improve utilization, save backplane terminals, and improve clock synchronization accuracy

Active Publication Date: 2019-05-28
FENGHUO COMM SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There will inevitably be delays in the transmission of clock signals; at the same time, the aging of hardware devices and temperature fluctuations will cause phase changes in clock signal transmission, which will increase the frequency and time output deviation of a single site ; which in turn makes it difficult to meet the high-precision clock synchronization requirements
[0005] In addition, with the improvement of the integration level of communication equipment, there are more and more functional requirements, and the terminals on the backplane are becoming more and more tense; however, the existing clock unit is connected to multiple service disks through multiple sets of physical buses, and one set of physical The bus corresponds to one service disk, and multiple sets of physical buses occupy more terminals on the backplane, which may lead to insufficient terminals on the backplane

Method used

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  • High-precision clock synchronization method and system for communication equipment

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Effect test

Embodiment 1

[0039] In this method, the process of the clock unit sending the transmission delay value to the service disk includes:

[0040] The clock unit periodically selects a service disk; when the service disk detects that the clock signal can be transmitted with the clock unit (conditions that can be transmitted, such as the bus used to transmit the clock signal between the service disk and the clock unit is not occupied) , upload the clock signal to the clock unit; the clock unit sends the corresponding transmission delay value to the service disk after receiving the clock signal.

[0041]It can be seen from this that the present invention only issues the transmission delay value to one service disk each time and performs phase compensation, the phase compensation logic is relatively simple, the coupling degree is low, and it is convenient for people to use; meanwhile, the present invention periodically The phase compensation of the clock signal of the service disk is carried out, ...

Embodiment 2

[0043] In this method, when the hardware physical transmission delay of the clock sending signal and the clock signal is the same, and the initial output clock of the service disk is consistent with the phase of the input clock, the calculation formula of the transmission delay value T is: T=T1 / 2, T1 is the clock transmission signal sent by the clock unit, and the clock phase difference between the clock signal and the clock signal uploaded by the service disk. When the hardware physical transmission paths of the clock sending signal and the clock signal are different, the transmission delay value can also be obtained according to other calculation methods related to T1.

[0044] It can be seen that those skilled in the art can clearly calculate and obtain the transmission delay value according to the above calculation formula.

[0045] see figure 1 As shown, the high-precision clock synchronization system of the communication device in the embodiment of the present invention...

Embodiment 3

[0052] see figure 1 As shown, the clock unit also includes a clock sending module and a clock receiving module, and the service tray also includes a clock input module and a clock output module.

[0053] The clock sending module is used to: send the clock sending signal to the phase measurement module, and also send the clock sending signal to the service disk through the downlink clock bus. For the integrity and reliability of the clock sending signal, the clock sending module will always pass the downlink clock bus Send the clock to send the signal;

[0054] The clock input module is used to: send the clock transmission signal issued by the clock transmission module to the phase compensation module;

[0055] The clock output module is used to: upload the clock signal formed by the phase compensation module to the clock unit;

[0056] The clock receiving module is used for sending the clock signal to the phase measurement module after receiving the clock signal through the ...

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Abstract

The invention discloses a high-precision clock synchronization method and system for communication equipment, and relates to the field of clock synchronization. The method comprises the following steps: a clock unit of communication equipment issues a transmission delay value to a service disk, and the transmission delay value is obtained according to a clock sending signal issued to the service disk by the clock unit and a clock phase difference of a clock signal uploaded to the clock unit by the service disk; And the service disk performs phase compensation on the clock sending signal according to the transmission delay value to form a clock signal which is basically consistent with the clock phase of the clock sending signal. According to the invention, after the clock signal is subjected to phase compensation by receiving the transmission time delay value, the compensated clock signal can be aligned with the output phase of the clock sending signal, so that the influence caused bythe transmission time delay of the clock signal in the prior art is eliminated, and the clock synchronization precision is greatly improved.

Description

technical field [0001] The invention relates to the field of clock synchronization, in particular to a high-precision clock synchronization method and system for communication equipment. Background technique [0002] With the development of communication technology, the mobile backhaul network is continuously upgraded along with the development of mobile network, and the application of new services puts forward higher requirements on the technical indicators of 5G (5th-generation, fifth-generation mobile communication technology); ultra-high precision Clock synchronization is one of the key technologies for 5G transport, which requires that the frequency and time output deviation of a single site be within 5 ns. [0003] However, the current communication equipment is difficult to meet the above ultra-high precision clock synchronization requirements, the reasons are: [0004] The clock unit of the communication device and the service disk are connected through a set of bac...

Claims

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Application Information

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IPC IPC(8): H04J3/06H04W56/00
Inventor 张春天许文龙杜虎
Owner FENGHUO COMM SCI & TECH CO LTD
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