Method and apparatus for controlling phase changing

Abstract

The invention discloses a method for controlling phase change and a device thereof, belonging to the communication field. The method comprises the following steps: recording a crystal oscillation frequency control value of the equipment when a reference clock is in normal condition; knowing that the reference clock is abnormal and calculating the average value of the crystal oscillation frequency control value according to the recorded crystal oscillation frequency control value; and setting the average value as the crystal oscillation frequency control value for controlling an equipment system clock when the reference clock is abnormal. When the reference clock are restored to be normal, the frequency of the equipment system clock is adjusted according to the frequency of the reference clock, phase deviation between the equipment system clock and the reference clock is calculated, frequency deviation is set by stages and phase adjustment is carried out till the phase deviation meets the requirements of the phase deviation; therefore, the frequency deviation between the equipment system clock and the reference clock is guaranteed to be minimum after the reference clock is lost so as to effectively delay the phase shafting; and after the reference clock are restored to be normal, the phase deviation is adjusted to be in the specific range fast and smoothly by adjusting frequency deviation without phase jump, thus guaranteeing that the service of a base station is not interrupted.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for controlling phase change. Background technique [0002] In the field of wireless communication, the clock synchronization between devices has a great impact on service performance, and each communication system has clear requirements for clock performance. For example: in the CDMA (Code Division Multiple Access, Code Division Multiple Access) system, the clock phase of each base station equipment is required to be in phase with the reference clock 1pps (pulses per second, pulse number / second) provided by the GPS (Global Positioning System, Global Positioning System) To be less than 3us (microseconds), WIMAX (Worldwide Interoperability for Microwave Access, that is, Global Microwave Interconnection Access) TDD (Time Division Duplexing, Time Division Duplex) system requires less than 1us. At present, the main synchronization solution is to use satellite timing rec...

AI Technical Summary

Problems solved by technology

[0005] After the reference clock is lost, the current DA value is directly used to control the base station system clock, which cannot guarantee the minimum frequency residual. Since the frequency residual and phase are integral, as time accumulates, it will lead to rapid phase diffusion. , the system clock of the base station cannot meet the normal operation needs of the business in a short period of time; and when the reference clock returns to normal, the way of forced phase alignment will cause the phase jump of the system clock of the base station itself, which has a great impact on the business of the base station, especially When the phase deviation between the system clock of the base station and the reference clock is large, the jump range will be large, and even affect the normal operation of the base station business, causing service interruption

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