Clock synchronization method and system

Abstract

An embodiment of the invention provides a clock synchronization method, which includes of acquiring the transmission time T1 of synchronous messages after receiving the synchronous messages; recording the clock count T2 of a local crystal oscillator when the synchronous messages arrive; sending delay correction application messages, recording the clock count T3 of the local crystal oscillator when in sending of the delay correction application messages and starting counting of a synchronous Ethernet clock; receiving the time T4 for main clock equipment to receive the delay correction application messages after receiving delay correction application response messages; computing transmission delay according to the T1, the T2, the T3 and the T4, and computing the main clock equivalence of the T3 according to the T1, the T2, the T3 and the transmission delay; summing the main clock equivalence of the T3 and the current counting value of the synchronous Ethernet clock, and finally regulating clock output according to the summing results. The invention further provides a clock synchronization system. By the clock synchronization method and the clock synchronization system in the technical scheme, complexity of clock synchronization is reduced, convergence rate is increased and cost is saved.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a clock synchronization method and system of a wireless communication system. Background technique [0002] Clock synchronization technology is the basic technology of communication system. The purpose of clock synchronization is to ensure that the sending end and the receiving end are synchronized in time to achieve correct and reliable communication. With the development of information technology, the requirements for time synchronization are getting higher and higher. Most of the current TDD (Time Division Duplexing, Time Division Duplex) communication technologies, such as TD-SCDMA, CDMA2000, WiMAX, etc., as well as LTE systems that are being developed and deployed, often require accurate time or phase between the air interfaces of the entire network. Synchronization, usually the frequency stability is required to be within ±0.05ppm, and the phase acc...

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Problems solved by technology

[0003] In view of the problems existing in the clock synchronization method of the prior art, the purpose of the invention of the embodiment of the present invention is to provide a new clock synchronization method and system, so as to reduce the complexity of the clock synchronization process of the prior art and improve the speed of slow synchronization convergence. , solve the problem of high cost

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