Method, system and device for time synchronous transfer

Abstract

The invention discloses a method for time synchronous transfer, which comprises the following steps: transmitting a synchronous pulse and transmitting time information of a main device by the main device; receiving the synchronous pulse and recording received time information of a slave device by the slave device; acquiring the transmission time delay of the synchronous pulse; determining the time deviation between the main device and the slave device by the slave device according to the transmitted time information of the main device, the received time information of the slave device and thetransmission time delay; and adjusting a local synchronous clock by the slave device according to the time deviation. The invention also discloses a system and a device for the time synchronous transfer. The method, the system and the device obtain the synchronous errors among devices and compensate the clock according to the synchronous errors so as to reduce the synchronous errors caused by thetransfer time delay of PPS and ensure that the synchronous errors of the cascade connection of a multilevel device are still lower than microsecond level.

Description

Technical field [0001] The present invention relates to the field of communication technology, in particular to a time synchronization transfer method, system and device. Background technique [0002] In the process of transforming to next-generation networks, all levels of networks such as mobile networks and fixed networks, as well as core networks, transport networks, and access networks have put forward new requirements for synchronization. For example, in the use of CDMA2000 (Code Division Multiple Access 2000, Code Division Multiple Access 2000) and TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, Time Division Synchronous Code Division Multiple Access) two standards, 3G (3th Generation, In the third-generation network, high-precision time synchronization is required between base station systems, for example, better than 10 μs (subtle). Because in soft handover, if there is no time synchronization between RNC (Radio Network Control) and NodeB (base station...

AI Technical Summary

Problems solved by technology

[0006] However, in a synchronous communication network that requires multi-level node device interconnection, one port of a device to another port may require internal multi-level time synchronization

The existing synchronization technology does not compensate for the synchronization error caused by the PPS transmission delay. This error will monotonically accumulate step by step. It cannot be guaranteed that the synchronization error will still be less than the microsecond level in the case of multi-level equipment cascading.

Images