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Time synchronization method, device and system in digital subscriber line

A digital subscriber line and time synchronization technology, applied in the field of network communication, can solve problems such as the inability to realize DSL system time synchronization, and achieve the effect of solving time synchronization problems

Inactive Publication Date: 2011-01-05
边顺玲
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  • Abstract
  • Description
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Problems solved by technology

[0004] To achieve high-precision time synchronization in an actual DSL system, many problems need to be solved, especially when the mobile service requires time synchronization accuracy to reach the microsecond level, the time synchronization problem on the DSL system cannot be realized in the prior art

Method used

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  • Time synchronization method, device and system in digital subscriber line

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Embodiment Construction

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] figure 1 Shown is the schematic diagram of precise time synchronization in the IEEE P1588V2 protocol, where Master is the master clock specified in the standard, and Slave is the slave clock specified in the standard. According to the standard protocol, Offset is the deviation between the slave clock and the master clock. Delay1 is the path delay from the master clock to the slave clock, Delay2 is the path delay from the slave clock to the master clock, acco...

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Abstract

The embodiment of the invention provides a time synchronization method, a time synchronization device and a time synchronization system in a digital subscriber line. The method comprises the following steps that: first equipment reads first time information when receiving a first position on a first symbol, and second equipment reads second time information when sending the first position on the first symbol; the first equipment receives the second time information of the second equipment and calculates the time deviation of the first equipment and the second equipment according to the first time information, the second time information and delay information, wherein the delay information is delay time for sending the symbol from the first equipment to the second equipment; and the first equipment adjusts the time of the first equipment according to the time deviation so as to realize time synchronization. Through the technical scheme, the time synchronization of the digital subscriber line is realized.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method, device and system for time synchronization in a digital subscriber line. Background technique [0002] Due to the emergence of third-generation mobile communications (3G) and more advanced digital mobile technologies, the rate of wireless access is getting higher and higher, and the access distance is getting shorter and shorter, and there is even a trend of evolution from base stations to homes. In terms of means to realize Mobile Backhaul, traditional mobile backhaul technologies include: optical fiber, E1 / T1, microwave, etc. In recent years, some new mobile backhaul (Mobile Backhaul) technologies have emerged continuously, such as the use of synchronous Ethernet and Digital Subscriber Line (DSL) technologies. With the evolution of base stations to home base stations, mobile backhaul is becoming more and more sensitive to costs (especially home base sta...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04B7/26
Inventor 冯儒洲徐贵今
Owner 边顺玲
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