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Method and device for channel clock synchronization

A clock synchronization, clock technology, applied in the direction of synchronization devices, synchronization transmitters, digital transmission systems, etc., can solve the problem of unable to meet the needs of time synchronization

Active Publication Date: 2020-09-15
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the high-precision time synchronization based on 1588v2 technology can only meet the time synchronization requirements of the order of us, but cannot meet the above-mentioned hundreds of ns or even higher precision time synchronization requirements

Method used

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  • Method and device for channel clock synchronization
  • Method and device for channel clock synchronization
  • Method and device for channel clock synchronization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0237] Such as Figure 5 As shown in the sending direction, the time stamp information generating module is responsible for generating a clock signal and sending it to the error correction coding module for error correction coding; the information after error correction coding is sent to the equalization coding module for equalization coding to balance the circuit transmission current; After encoding, perform parallel-to-serial conversion to PMA2 (physical medium attachment, realize serial-parallel and parallel-serial conversion); other business modules send business signals to PCS (physical coding sublayer, realize balanced coding and Ethernet protocol) / PMA1 for encoding and parallel Serial conversion; the serial data of the clock signal and the serial data of the service signal are sent to the modulation module at the same time, modulated to a line for transmission.

[0238] Such as Figure 5 As shown, in the receiving direction, the line signal first goes to the demodulati...

Embodiment 2

[0246] Such as Image 6 As shown, the clock signal of the device of the present invention is carried by the 1588 message to perform clock synchronization between the devices at both ends. The transmission rate of the clock signal is 1Gbps, and the transmission rate of other service signals is 10Gbps.

[0247] Other service signals can be modulated to the line through amplitude modulation, and 1588 data can be modulated to the line through frequency modulation. The FM signal is transmitted on the line, which may introduce bit errors, so the 1588 channel adds error correction codes in the sending direction, and adds error correction decoding in the receiving direction to correct the bit errors introduced during line transmission.

Embodiment 3

[0249] Another implementation of the present invention is as Figure 8 As shown in , the sending direction directly sends timestamps, custom encapsulation structure, such as Figure 9 As shown, the predefined encapsulation frame adopts the method of Ethernet, which consists of seven 55s and one d5, encapsulating time stamp and local delay.

[0250] When the clock is synchronized in the sending direction and the receiving direction, firstly send the local time stamp T1, and the time delay TC1 from the time stamp record position to the exit position of the electro-optic conversion module, after encapsulation and encoding, perform parallel-to-serial conversion and serial data conversion After being converted into an analog signal, it is modulated with the analog signal of other service channels and sent to the line.

[0251] After the receiving direction receives the modulated signal, it first demodulates, separates the time channel data from other business data, converts it int...

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Abstract

Provided are a channel clock synchronization method and device. The method comprises: respectively acquiring a clock signal and a service signal, and using two channels to respectively process the clock signal and the service signal; and modulating the clock signal and the service signal into one path of signals for transmission. The present application combines clock synchronization with other rates of services by means of modulation, and a clock signal and other service signals are separately processed, and are transmitted on one line.

Description

technical field [0001] The invention relates to the field of clock synchronization, in particular to a method and device for channel clock synchronization. Background technique [0002] With the continuous development of communication technologies, higher requirements are put forward for clock synchronization performance, where the clock includes frequency and / or time. For example, recently people have proposed using base stations to provide positioning services, and the time accuracy is required to be around ±200ns. The key technology of LTE-A (Long Term Evolution-Advanced, long-term evolution upgrade) CoMP-JP (Coordinated Multiple Points-Joint Processing, collaborative Multi-point transmission joint processing) requires the relative time accuracy between adjacent base stations to be around ±500ns; the future 5G (5th-Generation, fifth-generation mobile communication technology) system may require ultra-high-precision time synchronization on the order of hundreds of ns Requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/00H04L27/00
CPCH04L7/0087H04L7/0091H04L27/0014H04L2027/0018H04L2027/0024H04L7/00H04L27/00
Inventor 李霞游俊何力
Owner ZTE CORP