Fault location detection method, system and device for time synchronization system

Abstract

The invention discloses a fault location detection method, system and device of a time synchronization system. A master-slave link through a node is established between a time server TS and a wireless base station, and a transmission link is established between the wireless base station and the TS. The method includes: the TS receives the wireless base station clock information transmitted by the wireless base station through the transmission link, the TS determines whether the difference between the received wireless base station clock information and the local clock information exceeds the set system tolerance value, and if it exceeds, the TS instructs the master-slave chain Each node on the road uploads its own clock information to TS; TS compares the difference between the received clock information of each node and the local clock information, and determines time synchronization by confirming whether it exceeds the set system tolerance value failed node. In this way, nodes with time synchronization failures can be accurately detected.

Description

technical field [0001] The invention relates to the field of transmission systems, in particular to a fault location and detection method, system and device for a time synchronization system. Background technique [0002] IEEE1588V2 is a high-precision synchronization protocol standard using a transmission system. It defines the precision clock synchronization (PTP) protocol of the Ethernet network. The precision can reach sub-microsecond level, and it can realize frequency synchronization and time synchronization. Time synchronization refers to the phase synchronization of time. [0003] When performing time synchronization, the system is called a time synchronization system. The principle of time synchronization in a time synchronization system is: the master device (Master) and the slave device (Slave) use synchronization (Sync) messages, tracking (Follow_Up) messages, delay requests The (Delay_Req) ​​message and the delay response (Delay_Resp) message inform each other o...

AI Technical Summary

Problems solved by technology

[0019] exist image 3 In the above, the time synchronization accuracy of each node and wireless base station depends on the business traffic and the hardware of each node. For example, one of the nodes may have a significant drop in time synchronization accuracy due to the failure of the crystal oscillator of its own timer.

On a master-slave link, if a time synchronization failure occurs on an intermediate node, it will seriously affect the time synchronization accuracy of the downstream node

And when a time synchronization problem occurs, the downstream node cannot know whether the upstream node has a time synchronization failure, and it is further impossible to know which upstream node has a time synchronization failure

For example, in image 3 In , for example, a clock synchronization failure occurs on the port of node D connected to node C, resulting in a decrease in the accuracy of time synchronization. However, because the time synchronization process of the port of node B connected to node C is normal, node B will not find the time synchronization failure of node C, and Node D can only synchronize the time output by node C, and will not find the clock synchronization failure of node C. Therefore, in the entire master-slave link, no failure of node C is found, which will lead to a serious decline in the time synchronization accuracy of the wireless base station , which will further affect the transmission of services

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