Clock time synchronization precision improving method based on PTP protocol

A PTP protocol, clock time technology, applied in time division multiplexing systems, electrical components, multiplexing communications, etc., can solve problems such as synchronization time deviation, and achieve the effect of improving accuracy and accuracy

Inactive Publication Date: 2015-09-02
上海东土远景工业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the time deviation of the slave clock in the PTP domain will lead to the deviation of the synchronization time of the downstream slave clock of the slave clock, the present invention proposes a method for improving clock time synchronization accuracy based on the PTP protocol to reduce the synchronization time of the upstream slave clock. The impact of time deviation on the synchronization time of downstream slave clocks, improving the precision and accuracy of time synchronization in the entire PTP domain

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  • Clock time synchronization precision improving method based on PTP protocol
  • Clock time synchronization precision improving method based on PTP protocol
  • Clock time synchronization precision improving method based on PTP protocol

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Embodiment 1

[0039] The method for improving clock time synchronization accuracy based on the PTP protocol of the present invention comprises the following steps,

[0040] (1) time tester 14 is connected with verification clock source 15, and this verification clock source 15 is GPS, and time tester 14 obtains GPS accurate absolute time from verification clock source 15; Synchronous clock source 10 is also GPS, and master Clock 11 obtains GPS accurate absolute time from synchronized clock source 10 .

[0041] (2) Time tester 14 is connected with primary slave clock 12, and time tester 14 reads the current time of primary slave clock 12, and the current time of the primary secondary clock 12 that reads is 7:40:31 seconds 12 milliseconds and 23 microseconds, the current time of the GPS time obtained by the time tester 14 is 7:40:31, 12 milliseconds and 24 microseconds, and the difference between the current time of the primary slave clock 12 and the GPS time is -1 microsecond, That is, the ...

Embodiment 2

[0044] The method for improving clock time synchronization accuracy based on the PTP protocol of the present invention comprises the following steps,

[0045] (1) Time tester 14 is connected with verification clock source 15, and this verification clock source 15 is BDS, and time tester 14 obtains BDS accurate absolute time from verification clock source 15; Synchronous clock source 10 is also BDS, and master Clock 11 obtains BDS precise absolute time from synchronous clock source 10 .

[0046] (2) Time tester 14 is connected with primary slave clock 12, and time tester 14 reads the current time of primary slave clock 12, and the current time of the primary secondary clock 12 that reads is 9:27 minutes and 12 seconds 29 milliseconds and 42 microseconds, the current time of the BDS time obtained by the time tester 14 is 9:27:12, 29 milliseconds and 40 microseconds, and the difference between the current time of the primary slave clock 12 and the BDS time is 2 microseconds, name...

Embodiment 3

[0051] The method for improving clock time synchronization accuracy based on the PTP protocol of the present invention comprises the following steps,

[0052] (1) Time tester 14 is connected with verification clock source 15, and this verification clock source 15 is BDS, and time tester 14 obtains BDS accurate absolute time from verification clock source 15; Synchronous clock source 10 is also BDS, and master Clock 11 obtains BDS precise absolute time from synchronous clock source 10 .

[0053] (2) Time tester 14 is connected with primary slave clock 12, and time tester 14 reads the current time of primary slave clock 12, and the current time of the primary secondary clock 12 that reads is 16:18:45 seconds 27 milliseconds and 35 microseconds, the current time of the BDS time obtained by the time tester 14 is 16:18:45 seconds, 27 milliseconds and 32 microseconds, and the difference between the current time of the primary slave clock 12 and the BDS time is 3 microseconds, namely...

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Abstract

The invention belongs to the technical field of time synchronization. In order to solve the problem that the time deviation of a slave clock in a PTP domain leads to that the synchronous time of a downstream slave clock of the slave clock deviates, the invention provides a clock time synchronization precision improving method based on a PTP protocol. The method comprises the steps that: (1) a time testing instrument is connected with a verification clock source, the verification clock source is identical with a synchronous clock source of a main clock in the PTP domain; (2) the time testing instrument is connected with the slave clock so as to measure the time deviation value of the slave clock with regard to the verification clock source; (3) in a time synchronizing process, time compensation is carried out on the slave clock according to the measured time deviation value. According to the invention, the time deviation of the slave clock is eliminated, so that the time deviation of the slave clock has no influence on the synchronous time of the downstream slave clock of the slave clock, the precision and accuracy of the time synchronization between the upstream slave clock and the downstream slave clock are improved, and the precision and accuracy of the time synchronization in the whole PTP domain is further improved.

Description

technical field [0001] The invention belongs to the technical field of time synchronization, and in particular relates to a method for improving clock time synchronization precision based on the PTP protocol. Background technique [0002] In a communication network, the normal operation of many services requires network clock synchronization. [0003] In the third-generation mobile communication technology (3rd-Generation, 3G), a base station is usually installed with a satellite timing receiver to achieve time synchronization with a Global Positioning System (Global Positioning System, hereinafter referred to as GPS). The advantage of this method is that each base station is synchronized with GPS time independently, and does not need to receive clock signals from other base stations, which avoids interference and influence between different base stations; however, installing a satellite timing receiver for each base station will not only increase communication The cost of ...

Claims

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Application Information

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IPC IPC(8): H04J3/06
Inventor 赵旭阳刘晶顾宗良陈庆邦王绍伟
Owner 上海东土远景工业科技有限公司
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