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Reference clock source switching method and device

A technology of reference clock and clock source, applied in the field of wireless communication, can solve the problems of soft handover failure of communication system, avoid abnormal events of system clock, ensure the quality of system communication, and improve reliability.

Active Publication Date: 2013-09-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a reference clock source switching method and device, so as to at least solve the problem in the related art that the soft switching of the communication system fails due to the switching of the reference clock source

Method used

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  • Reference clock source switching method and device

Examples

Experimental program
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Embodiment 1

[0019] figure 1 It is a schematic structural diagram of a reference clock source switching device according to the first embodiment of the present invention. The device may be located in a synchronization processing device for synchronizing clock output signals in a digital communication device.

[0020] Such as figure 1 As shown, in the synchronization processing device for synchronizing clock output signals in digital communication equipment, multiple reference clock source inputs are received, namely figure 1 S shown by reference source 101 output IN1 , Reference source 102 output S IN2 Until the reference source S output by the reference source 107 INn (n is greater than 2). The device includes: a state detection unit 103 for real-time detection of the state of each reference clock source among multiple reference clock sources, and input the result to the selection and switching control unit 104; the selection and switching control unit 104 is connected to the state detectio...

Embodiment 2

[0032] image 3 It is a flowchart of a method for switching a reference clock source according to the second embodiment of the present invention. figure 1 or figure 2 The device shown is implemented. The method mainly includes the following steps (step S302-step S310):

[0033] Step S302, the digital phase-locked loop unit 106 detects the first phase difference between the output clock of the system local oscillator and the first reference clock source currently used by the system;

[0034] For example, the state detection unit 103 detects the state of multiple reference clock sources of the system in real time, and outputs the detection results to the selection and switching control unit 104, and the selection and switching control unit 104 selects the first normal state according to the state of each reference clock source. The reference clock source is used as the currently used reference clock source, and the reference clock source is input to the digital phase-locked loop uni...

Embodiment 3

[0044] This embodiment is based on Figure 4 Each clock shown is taken as an example for description. In this embodiment, the reference clock sources of the system are reference source 1 and reference source 2, and M=2, N=1.

[0045] Figure 5 The flowchart for switching the reference clock source in this embodiment mainly includes the following steps:

[0046] Step S501: In the system startup phase, reference source 1, reference source 2, ..., reference source n (n=2 in this embodiment) are all initialized normally and the startup is completed;

[0047] Step S502: During the system warm-up phase, the system detects the status of each reference clock source in real time, and if the reference source status is normal, execute step S503 and step S506;

[0048] Step S503, detecting the phase difference between the two reference clock sources;

[0049] Step S504: Divide the value of the detected phase difference by 2 and save, that is, save the phase value P1 / 2;

[0050] Step S505, input P1 / 2...

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Abstract

The invention discloses reference clock source switching method and device, wherein the reference clock source switching method comprises the following steps of: detecting a first phase difference between a local oscillator output clock of a system and a first reference clock source currently used by the system; acquiring the maximal phase difference between pairwise reference clock sources of a plurality of reference clock sources of the currently detected system; controlling the local oscillator output clock through the sum of the first phase difference and N / M times of the maximal phase difference; detecting a second phase difference between the local oscillator output clock and a second reference clock source when the system is switched to the second reference clock source; and controlling the local oscillator output clock through the difference of the second phase difference and (M-N) / M times of the maximal phase difference, wherein the plurality of reference clock sources include the first reference clock source and the second reference clock source, M and N are natural numbers, and M is larger than N. The invention can be used for effectively preventing anomalous events of the system clocks from happening after switching.

Description

Technical field [0001] The invention relates to the field of wireless communication, and in particular to a method and device for switching a reference clock source in a base station system. Background technique [0002] In the existing wireless communication system, the base station needs to have an external clock source as a reference, and use it to correct the local clock frequency. In the system, the clock source used to correct the local clock is called the reference clock source. [0003] At present, most wireless synchronization networks use the Global Position System (GPS) as a reference clock source to correct the reference clock; the reference clock unit tracks the PP1S (second pulse) clock output by the GPS receiver, and uses a digital phase-locked loop to control the local The oscillator output clock performs tracking control until the oscillator output clock is synchronized with the GPS receiver output PP1S clock, so that the clocks of other nodes in the system are sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L7/02H03L7/099
Inventor 王文静
Owner ZTE CORP
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