Time synchronization system and method

Abstract

The invention discloses a time synchronization system and method. The system comprises a frequency synchronization network and a time synchronization network, wherein the frequency synchronization network is used for transmitting a frequency synchronization signal to the time synchronization network after implementing frequency synchronization of every network element; and the time synchronization network is used for receiving the frequency synchronization signal from the frequency synchronization network, carrying out time counting according to the frequency synchronization signal to establish local time, and exchanging a time synchronization protocol message to calibrate the local time. According to the technical scheme disclosed by the invention, the high-precision time synchronization requirement can be satisfied; meanwhile, the time synchronization network and the frequency synchronization network are relatively independent logically in the aspects of frequency / time reference source selection mechanism, synchronous route computing mechanism and protective switching mechanism, and the layered architectures of the two networks in such a structure can be separated physically or logically; and thus, the system is very easy to maintain and manage, and the time synchronization network can be allocated according to the specific network environment, thereby enhancing the internetworking flexibility.

Description

technical field [0001] The present invention relates to the communication field, in particular to a time synchronization system and method. Background technique [0002] The traditional telecom synchronization network is a frequency synchronization network, which is composed of different levels of independent clock units and equipment clocks connected through synchronization links. Clock source and clock link protection are implemented through static configuration and synchronization status message (Synchronization Status Message, SSM for short). Currently the most widely used is a synchronous network based on a synchronous digital hierarchy (Synchronous Digital Hierarchy, referred to as SDH), and its related standards are formulated by the ITU-T. Under the trend of packetization of network devices, a technology for realizing frequency synchronization based on the Ethernet physical layer has emerged, that is, the synchronous Ethernet standard defined by ITU-T. Similar to t...

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Problems solved by technology

[0006] The present invention is proposed in view of the problems in the related art that the time synchronization performance is affected by factors such as clock frequency synchronization accuracy, stability, and two-way delay asymmetry, and it is difficult to meet the high-precision time synchronization requirements of the base station. Therefore, the present invention The main purpose is to provide an improved time synchronization system and method to solve at least one of the above problems

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