CN101499797B - Method and apparatus for controlling phase changing - Google Patents

Abstract

The invention discloses a method and a device for controlling phase change, belonging to the communication field. The method includes: when the reference clock is normal, recording the crystal oscillator frequency control value of the device; knowing that the reference clock is abnormal, calculating the average value of the crystal oscillator frequency control value according to the recorded crystal oscillator frequency control value; setting the average value as the reference clock abnormality Time control device system clock crystal oscillator frequency control value. When the reference clock returns to normal, adjust the frequency of the device system clock according to the frequency of the reference clock, calculate the phase deviation between the device system clock and the reference clock, and set the frequency deviation in stages to adjust the phase until the phase deviation meets the phase deviation requirements. It ensures that after the reference clock is lost, the frequency deviation between the device system clock and the reference clock is the smallest, effectively delaying the phase drift; after the reference clock returns to normal, the phase deviation can be quickly and smoothly adjusted to the specified range by adjusting the frequency deviation, without phase jump changes, ensuring uninterrupted base station services.

Description

Method and device for controlling phase change

technical field

The invention relates to the communication field, in particular to a method and device for controlling phase change.

Background technique

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 requirements are less than 1us. At present, the main synchronization solution is to use satellite timing receivers such as GPS to provide reference clocks for each base station equipment. Under normal GPS conditions, the system clocks of each base station track the reference clock output by the satellite timing receiver through soft phase lock. To achieve the required clock performance requirements, but due to weather conditions, satellite timing receiver failures and other reasons, the satellite timing receiver is unavailable, how to extend the clock performance of the base station equipment as much as possible to ensure the normal operation of the business is a problem that must be considered and solved.

For abnormal situations such as the loss of the reference clock, the solution in the prior art is to directly use the frequency control value (DA value) of the current voltage-controlled crystal oscillator whose reference clock is lost to control the base station system clock after the reference clock is lost. After returning to normal, the base station system clock phase is forced to align with the reference clock phase directly based on the reference clock phase. The above method can meet the operation requirements of the service to a certain extent.

In the process of realizing the present invention, the inventor finds that the above-mentioned prior art has at least the following disadvantages and deficiencies:

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 range of jumps will be large, and even the normal operation of the base station service will be affected, resulting in service interruption.

Contents of the invention

In the case of reference clock loss and reference clock recovery, in order to ensure normal operation of base station services as much as possible, embodiments of the present invention provide a method and device for controlling phase change. Described technical scheme is as follows:

On the one hand, an embodiment of the present invention provides a method for controlling phase change, the method comprising:

When the reference clock is normal, according to the sampling frequency, the phase-locked loop of the recording device is the crystal frequency control value in the locked state;

Obtain the abnormal time of the reference clock;

According to the abnormal time of the reference clock, obtain the crystal oscillator frequency control value recorded in the preset time period before the abnormal time of the reference clock;

According to the acquired crystal oscillator frequency control value, calculate the average value of the acquired crystal oscillator frequency control value;

Divide the obtained crystal oscillator frequency control values into groups, and calculate the mean value of the crystal oscillator frequency control values of each group;

calculating the difference between the mean value of each group and the calculated mean value of the acquired crystal oscillator frequency control value;

For the current group, if the calculated difference does not exceed the preset difference, then retain the current group, and calculate the average value of the reserved crystal frequency control values according to the reserved crystal frequency control values in each group;

The average value of the calculated and reserved crystal oscillator frequency control values is set as the crystal oscillator frequency control value of the system clock of the control device when the reference clock is abnormal.

In another aspect, the embodiment of the present invention also provides a method for controlling phase change. After the reference clock is in an abnormal state, the method includes:

When the reference clock returns to normal, adjust the frequency of the device system clock according to the frequency of the reference clock until the frequency deviation between the device system clock and the reference clock meets the frequency deviation requirement;

After the frequency deviation meets the frequency deviation requirement, calculate the phase deviation between the device system clock and the reference clock;

According to the phase deviation, set the frequency deviation in stages to adjust the phase until the phase deviation meets the phase deviation requirement.

On the other hand, an embodiment of the present invention also provides a device for controlling phase change, and the device includes:

A recording module, comprising a setting unit and a recording unit, configured to record the phase-locked loop of the device as the crystal oscillator frequency control value in a locked state according to the sampling frequency set by the setting unit when the reference clock is normal;

The calculation module includes an acquisition unit, an acquisition unit, a calculation unit, a group calculation unit, and a processing unit; the acquisition unit is used to obtain the abnormal time of the reference clock; the acquisition unit is used to obtain the reference clock according to the abnormal time of the reference clock. The crystal oscillator frequency control value recorded in the preset time period before the clock abnormal moment; the calculation unit is used to calculate the average value of the crystal oscillator frequency control value obtained according to the acquired crystal oscillator frequency control value; the grouping calculation unit is used for The obtained crystal frequency control value is divided into groups, and the mean value of the crystal frequency control value of each group is calculated; the processing unit is used to calculate the difference between the mean value of each group and the calculated mean value of the obtained crystal frequency control value. Difference, for the current group, if the calculated difference does not exceed the preset difference, then retain the current group, and calculate the average value of the reserved crystal frequency control values according to the reserved crystal frequency control values in each group;

The setting module is used to set the average value of the calculated and reserved crystal oscillator frequency control values as the crystal oscillator frequency control value of the system clock of the control device when the reference clock is abnormal.

In another aspect, an embodiment of the present invention also provides a device for controlling phase change, the device comprising:

The first adjustment module is configured to adjust the frequency of the device system clock according to the frequency of the reference clock when the reference clock returns to normal until the frequency deviation between the device system clock and the reference clock meets the frequency deviation requirement;

A calculation module, configured to calculate the phase deviation between the system clock of the device and the reference clock when the frequency deviation meets the frequency deviation requirement;

The second adjustment module is configured to set the frequency deviation in stages to adjust the phase according to the phase deviation until the phase deviation meets the phase deviation requirement.

The beneficial effects of the technical solution provided by the embodiments of the present invention are:

When the reference clock is lost, the frequency control value of the base station system clock is calculated by using the frequency control value recorded in the normal case of the reference clock before, to ensure that after the reference clock is lost, the frequency deviation between the base station system clock and the reference clock is the smallest, which can Effectively delay the phase spread; after the reference clock returns to normal, according to the actual phase deviation, by adjusting the frequency deviation between the base station system clock and the reference clock, quickly and smoothly adjust the phase deviation to the specified range, avoid phase jump, and ensure The normal operation of the base station business ensures that the base station business is not interrupted.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a flowchart of a method for controlling phase change provided by an embodiment of the present invention;

Fig. 2 is another flowchart of a method for controlling phase change provided by an embodiment of the present invention;

FIG. 3 is a flowchart of a method for controlling phase change provided by Embodiment 1 of the present invention;

Fig. 4 is a schematic diagram of the recording of the DA value provided by Example 1 of the present invention;

FIG. 5 is a flowchart of a method for controlling phase change provided by Embodiment 2 of the present invention;

FIG. 6 is a schematic diagram of a device for controlling phase change provided by Embodiment 3 of the present invention;

FIG. 7 is a detailed schematic diagram of a device for controlling phase change provided by Embodiment 3 of the present invention;

FIG. 8 is another detailed schematic diagram of the device for controlling phase change provided by Embodiment 3 of the present invention;

9 is a schematic diagram of a device for controlling phase change provided by Embodiment 4 of the present invention;

FIG. 10 is a detailed schematic diagram of a device for controlling phase change provided by Embodiment 4 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

In the case of reference clock loss and reference clock recovery, in order to ensure the normal operation of base station services as much as possible, the embodiment of the present invention provides a method for controlling phase change, see Figure 1. On the one hand, when the reference clock is lost, in order to delay Phase diffusion, the content of the method is as follows:

101: When the reference clock is normal, record the crystal oscillator frequency control value of the device;

102: Knowing that the reference clock is abnormal, calculate the average value of the crystal oscillator frequency control value according to the recorded crystal oscillator frequency control value;

103: Set the calculated average value as the crystal oscillator frequency control value of the system clock of the control device when the reference clock is abnormal.

The method provided by the embodiment of the present invention ensures that after the reference clock is lost, the frequency deviation between the system clock of the base station and the reference clock is the smallest, which can effectively delay the phase diffusion and ensure the normal operation of the base station service.

On the other hand, after the reference clock is in an abnormal state, if the reference clock is recovered, in order to suppress the phase jump and try to ensure the normal operation of the base station business, see Figure 2, the embodiment of the present invention also provides a method for controlling the phase change, the content of the method as follows:

201: When the reference clock returns to normal, adjust the frequency of the device system clock according to the frequency of the reference clock until the frequency deviation between the device system clock and the reference clock meets the frequency deviation requirement;

202: After the frequency deviation meets the frequency deviation requirement, calculate the phase deviation between the device system clock and the reference clock;

203: According to the phase deviation, set the frequency deviation in stages to adjust the phase until the phase deviation meets the phase deviation requirement.

The method provided by the embodiment of the present invention adjusts the frequency deviation between the system clock of the base station and the reference clock, quickly and smoothly adjusts the phase deviation to a specified range, avoids phase jumps, ensures the normal operation of the base station business, and ensures that the base station business is not interrupted .

In order to describe the methods provided by the above-mentioned embodiments of the present invention in detail, please refer to the following embodiments, wherein, Embodiment 1 mainly describes the situation where the reference clock is lost, and Embodiment 2 mainly describes the situation where the reference clock is recovered. For details, see as follows:

Example 1

The equipment is described by taking the base station as an example. When the reference clock is lost during the operation of the base station, in order to improve the maintenance performance of the local system clock of the base station and prolong the normal operation time of the base station business as much as possible, the embodiment of the present invention provides a control phase change method, see Figure 3, the method is as follows:

301: When the reference clock is normal, according to the sampling frequency, record the frequency control value of the voltage-controlled crystal oscillator (referred to as the crystal oscillator frequency control value DA) when the phase-locked loop of the base station is locked.

Wherein, the recording process in step 301 can be to track and sample records in real time according to the sampling frequency during the operation of the base station, and the above-mentioned sampling frequency can be set according to actual needs, for example, it is set to sample every 1m (minute), that is, every 1m The DA value of the phase-locked loop is recorded once, and this embodiment does not impose any limitation on the specific value of the sampling frequency.

Wherein, in this step 301, when the reference clock is normal, it is also possible to continuously record the frequency control value of the voltage-controlled crystal oscillator when the phase-locked loop of the base station is in the locked state, that is, the obtained phase-locked loop of the base station is in the locked state. The frequency control value of the crystal oscillator is continuous data, which is not limited in this embodiment.

302: Knowing that the reference clock is abnormal, according to the DA value data recorded above, obtain a crystal oscillator frequency control value DA for controlling the system clock of the base station when the reference clock is abnormal.

Wherein, the specific implementation content of step 302 may be as follows:

First, after the reference clock is lost and other abnormalities, obtain the DA values recorded in the last period of time before the reference clock abnormality (for example, record each DA value in the last few hours), and calculate the average value based on the obtained DA values DA value, the calculated average DA value is used as the crystal oscillator frequency control value DA for controlling the system clock of the base station when the reference clock is abnormal.

Referring to FIG. 4 , it is a schematic diagram of calculating the DA value after the reference clock is abnormal provided by the embodiment of the present invention. As shown in FIG. The DA value recorded in the previous X hours of the time (the specific value of X is set according to needs), as shown in Figure 4, assuming that the present embodiment sets the value of X to 6, then correspondingly, select from May 2008 From 6:00 on the 1st of the month to 12:00 on the 1st of May 2008, and obtain the DA value recorded in the selected time period, calculate the average DA value according to the obtained DA values, and use the average DA value When the reference clock is abnormal, control the crystal oscillator frequency control value DA of the system clock of the base station. Referring to Table 1, assuming that the sampling period is 1 hour, the DA values recorded in the selected time period (6 hours) are shown in Table 1.

Table 1

record moment 6:00 7:00 8:00 9:00 10:00 11:00 ... DA value 20.4 20.5 20.6 20.5 20.6 20.6 ...

As shown in Table 1, the obtained DA values are 20.4, 20.5, 20.6, 20.5, 20.6, and 20.6 respectively, then calculate the average value of the above DA values. For example, you can directly average each DA value to obtain an average value of 20.517. Take approximately 20.5, and use 20.5 as the crystal oscillator frequency control value DA for controlling the system clock of the base station after the reference clock is lost. In addition, mean square processing may also be performed on each acquired DA value to obtain an average value, and the manner and method for calculating the average value are not limited in this embodiment.

Furthermore, this embodiment fully considers that the synchronization effect of the base station may have been affected by the abnormality of the reference clock for a period of time before the abnormality of the reference clock. In order to improve the calculation accuracy, when selecting the time period, the period before the abnormality of the reference clock is removed The DA value recorded during the time is still illustrated by taking Figure 4 as an example. It is still assumed that the abnormal time when the reference clock is lost is 12:00 on May 1, 2008, fully considering that before the abnormal time when the reference clock is lost (for example Since 10:00 on May 1, 2008), it has already been affected by the abnormality of the reference clock. When selecting the time period, it will be removed from 10:00-12:00, that is, the selected time period is May 2008 From 6:00 on the 1st of the month (can be called the search start time) to 10:00 on May 1, 2008 (can be the search end time), and then calculate the reference clock loss according to the recorded DA value in this time period After controlling the crystal oscillator frequency control value DA of the system clock of the base station, in addition, optionally, the above-mentioned search time can also be taken as 4:00 on May 1, 2008, and the specific selection is performed according to the actual situation. No restrictions. See also the following for details: Assume n hours before the abnormality, and m hours before the abnormality, where n>m, where the finally calculated system clock frequency control value DA for controlling the system clock of the base station after the reference clock is lost is as follows:

1. Obtain the historical DA value recorded within n time before the reference clock abnormality, the last recorded historical DA value within m time, and obtain the DA difference, that is, obtain the DA value between n and m time;

2. Take the average value DAavg of the DA value between n and m times, and use the average value DAavg directly as the crystal oscillator frequency control value DA after the abnormal reference clock, so as to ensure the accuracy of the base station system clock frequency.

Further, in order to improve the accuracy of calculation, on this basis, the DA values recorded between n and m times can be divided into several groups in sequence, and the average value DAi of each group of DA values is calculated respectively; secondly, use each The average value DAi of the group is compared with the average value DAavg calculated earlier. If the deviation between DAi and DAavg exceeds the specified value (the specified value is set according to actual needs), the corresponding DA data of this group is removed, and then according to the remaining An average value is calculated from the DA value, and the calculated average value is used as the final reference clock lost crystal oscillator frequency control value DA. This embodiment does not impose any limitation on the specific calculation method for obtaining the average value.

In the method provided by the embodiment of the present invention, by recording the frequency control value DA of the voltage-controlled crystal oscillator when the phase-locked loop of the base station is in a locked state, when the reference clock is abnormal, the system clock frequency control value DA is obtained by calculating the recorded DA value, and the The calculated value is used as the crystal oscillator frequency control value after the reference clock is lost, so that the local system clock frequency of the base station equipment is accurate, and the frequency deviation between the reference clock and the reference clock is as small as possible, thereby effectively delaying the spread of the phase deviation and ensuring business operation. normal.

In the solution provided by the above-mentioned embodiment 1, in the case of abnormal conditions such as the loss of the reference clock, the frequency control value of the crystal oscillator after the reference clock is lost is calculated according to the frequency control value recorded by the reference clock under normal conditions, so as to ensure that after the reference clock is lost, The frequency deviation between the system clock of the base station and the reference clock is the smallest, which can effectively delay the phase drift and ensure the normal operation of the service. The following embodiment 2 will focus on how to realize the smooth transition of the phase and effectively avoid the phase jump when the reference clock returns to normal. , so as to ensure the normal operation of the business, for detailed description, see the following:

Example 2

Still taking the base station as an example, after the reference clock of the base station is in an abnormal state, if the reference clock returns to normal, in order to effectively avoid phase jumps and ensure normal service operation of the base station, an embodiment of the present invention provides a control phase For the method of change, see Figure 5, the content of the method is as follows:

Step 501: When the reference clock returns to normal, adjust the frequency of the system clock of the base station according to the frequency of the reference clock, so as to eliminate the frequency deviation between the system clock of the base station and the reference clock.

Wherein, the specific implementation of step 501 includes: when the reference clock returns to normal, calculate the frequency deviation between the base station system clock and the reference clock; according to the calculated frequency deviation, adjust the crystal oscillator frequency control value of the base station, thereby eliminating the base station system clock and the reference clock frequency deviation. Wherein, since there is a mapping relationship between the frequency deviation and the frequency control value DA of the voltage-controlled crystal oscillator, the frequency deviation between the system clock of the base station and the reference clock can be eliminated by adjusting the frequency control value DA of the voltage-controlled crystal oscillator of the base station. For example, when the reference clock returns to normal, the frequency control value DA of the voltage-controlled crystal oscillator of the base station is 55, the frequency of the base station system clock is 30 Hz (Hertz), and the frequency of the reference clock is 20 Hz, that is, the frequency deviation between the base station system clock and the reference clock is 10Hz, correspondingly on the basis that the frequency control value DA of the voltage-controlled crystal oscillator of the base station is 55, adjust forward by 1, and adjust the frequency control value DA of the voltage-controlled crystal oscillator of the base station to 54, that is, to realize the system clock of the base station The frequency reaches 20HZ, thereby eliminating the frequency deviation of the base station system clock and the reference clock.

Step 502: After eliminating the frequency deviation between the system clock of the base station and the reference clock, calculate the phase deviation between the system clock of the base station and the reference clock.

Step 503: Determine whether the phase deviation is within the allowable range of the phase deviation, if yes, perform step 504; otherwise, perform step 505.

Wherein, the allowable range of the phase deviation described in step 503 can be set as required. For example, for a CDMA system, if only the service operation of the base station itself is considered, the allowable range of the phase deviation can be set to 5us, which can ensure the The business operation is normal, but in practical applications, the business operation between the base stations is usually fully considered, so preferably, under the CDMA system, referring to the requirements of the CDMA system, the allowable range of the phase deviation can be set to 3us (that is, the base station system clock The phase of the reference clock is within 3us ahead of the phase of the reference clock, or the phase of the system clock of the base station is within 3us of the phase of the reference clock), wherein the specific value of the allowable range of the phase deviation is determined according to the system test, and the embodiment of the present invention This does not make any restrictions.

Step 504: According to the magnitude of the phase deviation, determine the corresponding frequency deviation to perform fast phase adjustment.

Wherein, executing to step 504 means that the phase deviation is within the allowable range. In order to suppress the phase jump, the corresponding frequency deviation is determined according to the size of the phase deviation to perform fast phase adjustment. The specific content is as follows: according to the phase deviation, set in stages Frequency deviation, adjust the phase until the phase deviation is eliminated.

In practical applications, there will always be a certain phase deviation between the local system clock of the base station and the reference clock, which is an unavoidable situation in physics, that is, there is an acceptable deviation range value (for example, ±1us), therefore, the above-mentioned until eliminated The phase deviation satisfies normal business requirements, correspondingly: adjust the phase deviation to fall within the acceptable deviation range.

For example, assuming that the phase of the base station system clock is ahead of the phase of the reference clock, and the phase deviation is 30us, you can set the frequency deviation to 1hz for phase adjustment, that is, calculate the DA value corresponding to the frequency deviation of 1hz on the basis of the original DA, and control The frequency output of the base station system clock crystal oscillator; when a phase deviation of 5 microseconds is detected after an adjustment cycle, the frequency deviation can be set to 0.5 Hz for phase adjustment; ...; and so on, according to the phase deviation, the frequency deviation is set in stages to carry out The phase is adjusted until the phase deviation is less than a specified value (for example, 1 microsecond), that is, the phase rapid adjustment ends. When the fast phase adjustment is completed, the DA value described in step 501 is restored, the PLL enters the normal adjustment state, and the system clock of the base station is synchronized with the reference clock. Usually, if the phase of the system clock of the base station is ahead of the phase of the reference clock, the system clock of the base station will be synchronized with the reference clock. Adjust the frequency to a lower level to gradually eliminate the phase deviation; on the contrary, if the phase of the base station system clock lags behind the phase of the reference clock, adjust the frequency of the base station system clock to a higher level to gradually eliminate the phase deviation.

Step 505: Perform mandatory phase alignment between the system clock of the base station and the reference clock.

Wherein, the execution to step 505 means that the phase deviation has exceeded the allowable range. In order to ensure the normal operation of the service, it is necessary to perform mandatory phase alignment between the base station system clock and the reference clock, that is, based on the phase of the reference clock, the The phase of the system clock of the base station is adjusted to be consistent with the phase of the reference clock at one time. This step belongs to the prior art and will not be repeated here.

In the method provided by the embodiment of the present invention, after the reference clock returns to normal, according to the actual phase deviation, by adjusting the frequency deviation between the base station system clock and the reference clock, the phase deviation is adjusted quickly and smoothly until the phase deviation falls into the specified range, Realize no phase jump and ensure uninterrupted base station services.

Example 3

Referring to Figure 6, an embodiment of the present invention provides a device for controlling phase change, which includes:

A recording module 601, configured to record the crystal oscillator frequency control value of the device when the reference clock is normal;

Calculation module 602, is used for knowing that the reference clock is abnormal, and calculates the average value of the crystal oscillator frequency control value according to the recorded crystal oscillator frequency control value;

The setting module 603 is configured to set the calculated average value as the crystal oscillator frequency control value of the system clock of the control device when the reference clock is abnormal.

See Figure 7 for details, which is a detailed schematic diagram of a device for controlling phase change provided by an embodiment of the present invention, as shown in Figure 7, wherein the recording module 601 includes:

A setting unit 6011, configured to set the sampling frequency;

The recording unit 6012 is configured to set the sampling frequency according to the setting unit 6011, and record the frequency control value of the crystal oscillator when the phase-locked loop of the recording device is in a locked state.

Wherein, the computing module 602 includes:

Obtaining unit 6021, configured to obtain the abnormal time of the reference clock;

The acquisition unit 6022 is configured to acquire the crystal oscillator frequency control value recorded in the preset time period before the abnormal time of the reference clock according to the abnormal time of the reference clock;

The calculation unit 6023 is configured to calculate the average value of the recorded crystal oscillator frequency control values according to the frequency control values acquired by the acquisition unit 6022 .

1) Among them, the acquisition unit 6022 includes:

The first search subunit 60221 is used to search forward from the abnormal time of the reference clock according to the abnormal time of the reference clock to obtain the search start time; the time difference between the search start time and the abnormal time of the reference clock is a preset time period;

The first obtaining subunit 60222 is used to obtain the crystal oscillator frequency control value recorded within the preset time period.

2) Wherein, the obtaining unit 602 includes:

The second search subunit 60223 is used to search forward from the abnormal time of the reference clock according to the abnormal time of the reference clock, and obtain the search start time and search end time; the time difference between the search start time and the search end time is preset period;

The second obtaining subunit 60224 is used to obtain the crystal oscillator frequency control value recorded within the preset time period.

Wherein, see also FIG. 8, which is another detailed schematic diagram of the device for controlling phase change provided by the embodiment of the present invention, as shown in FIG. 8, wherein, the calculation module 602 includes:

The calculation unit 6024 is used to calculate the average value of the recorded crystal frequency control value according to the recorded crystal frequency control value;

The group calculation unit 6025 is used to divide the recorded crystal oscillator frequency control values into groups, and calculate the mean value of the crystal oscillator frequency control values of each group;

The processing unit 6026 is used to calculate the difference between the average value of each group and the average value calculated by the above calculation unit; for the current group, if the calculated difference does not exceed the preset difference, the current group is retained, and according to the retained Crystal oscillator frequency control value in the group, calculate the average value of the reserved crystal oscillator frequency control value.

In the device provided by the embodiment of the present invention, by recording the frequency control value DA of the voltage-controlled crystal oscillator when the phase-locked loop of the base station is locked, when the reference clock is abnormal, the system clock frequency control value DA is obtained by calculating the recorded DA value, and the The calculated value is used as the crystal oscillator frequency control value after the reference clock is lost, so that the local system clock frequency of the base station equipment is accurate, and the frequency deviation between the reference clock and the reference clock is as small as possible, thereby effectively delaying the spread of the phase deviation and ensuring business operation. normal.

Example 4

Referring to Fig. 9, an embodiment of the present invention provides a device for controlling phase change, which includes:

The first adjustment module 701 is configured to adjust the frequency of the device system clock according to the frequency of the reference clock when the reference clock returns to normal until the frequency deviation between the device system clock and the reference clock meets the frequency deviation requirement;

A calculation module 702, configured to calculate the phase deviation between the device system clock and the reference clock when the frequency deviation meets the frequency deviation requirement;

The second adjustment module 703 is configured to set the frequency deviation in stages to perform phase adjustment according to the phase deviation until the phase deviation meets the phase deviation requirement.

Further, see FIG. 10 for details, which is a detailed schematic diagram of a device for controlling phase change provided by an embodiment of the present invention. As shown in FIG. 10 , the device also includes:

A judging module 704, configured to judge whether the magnitude of the phase deviation is within the allowable range of the preset phase deviation;

Correspondingly, the second adjustment module 703 is configured to, when the determination result of the determination module 704 is yes, set the frequency deviation in stages according to the phase deviation and perform phase adjustment until the phase deviation meets the phase deviation requirement.

Wherein, the second adjustment module 703 includes:

The setting unit 7031 is used to set the size of the frequency deviation adjusted this time according to the size of the current phase deviation;

A calculation unit 7032, configured to calculate the crystal oscillator frequency control value of the device according to the frequency deviation set by the setting unit 7031;

The processing unit 7033 is used to control the crystal oscillator frequency output of the device according to the crystal oscillator frequency control value calculated by the calculation unit 7032; after the output of the crystal oscillator frequency of the control device, determine whether the adjusted phase deviation meets the phase deviation requirement, and if not , then continue to perform phase adjustment according to the magnitude of the adjusted phase deviation until the phase deviation meets the phase deviation requirement.

In the device provided by the embodiment of the present invention, after the reference clock of the base station is in an abnormal state, if the reference clock returns to normal, the frequency deviation between the system clock of the base station and the reference clock can be adjusted quickly and smoothly according to the actual phase deviation. Phase deviation until the phase deviation meets the specified range, no phase jump is realized, and the base station business is not interrupted.

The word "receive" in the embodiments of the present invention can be understood as actively obtaining information from other modules or receiving information sent by other modules.

Those skilled in the art can understand that the drawing is only a schematic diagram of a preferred embodiment, and the modules or processes in the drawing are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, and can also be changed and located in one or more devices different from the embodiment. The modules in the above embodiments can be combined into one module, and can also be further split into multiple sub-modules.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

Part of the steps in the embodiments of the present invention can be realized by software, and the corresponding software program can be stored in a readable storage medium, such as an optical disk or a hard disk.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (6)

1. the method that changes of a control phase is characterized in that said method comprises:

When the reference clock normal condition, according to sample frequency, the phase-locked loop of recording equipment is the crystal oscillator frequency controlling value under the lock-out state;

Obtain the unusual moment of reference clock;

According to the unusual moment of said reference clock, obtain the crystal oscillator frequency controlling value of record in the Preset Time section of said reference clock before the unusual moment;

According to the crystal oscillator frequency controlling value of obtaining, calculate the mean value of the crystal oscillator frequency controlling value of obtaining;

Crystal oscillator frequency controlling value to obtaining is organized division, calculates the average of the crystal oscillator frequency controlling value of each grouping;

Difference between the mean value of the crystal oscillator frequency controlling value of obtaining of calculating the average of each grouping and calculating;

To current group, if the difference that calculates surpasses preset difference value, then keep said current group, according to the crystal oscillator frequency controlling value in each grouping that keeps, calculate the mean value of the crystal oscillator frequency controlling value that keeps;

The crystal oscillator frequency controlling value of the mean value of the crystal oscillator frequency controlling value of the reservation that setting calculates control appliance system clock when clock is unusual as a reference.

2. the method for claim 1 is characterized in that, and is said according to the unusual moment of said reference clock, obtains the crystal oscillator frequency controlling value of record in the Preset Time section of said reference clock before the unusual moment, comprising:

According to the unusual moment of said reference clock, begin to search forward from the unusual moment of said reference clock, obtain and search the initial moment;

It is said that to search the unusual time difference between constantly of the initial moment and said reference clock be said Preset Time section;

Obtain the crystal oscillator frequency controlling value of record in the said Preset Time section.

3. the method for claim 1 is characterized in that, and is said according to the unusual moment of said reference clock, obtains the crystal oscillator frequency controlling value of record in the Preset Time section of said reference clock before the unusual moment, comprising:

According to the unusual moment of said reference clock, begin to search forward from the unusual moment of said reference clock, obtain and search the initial moment, search termination constantly; It is said that to search the time difference that initial moment and said searches between stopping constantly be said Preset Time section;

Obtain the crystal oscillator frequency controlling value of record in the said Preset Time section.

4. the device that changes of a control phase is characterized in that said device comprises:

Logging modle comprises unit and record cell are set, and is used for when the reference clock normal condition, according to said the sample frequency that the unit is provided with is set, and is the crystal oscillator frequency controlling value under the lock-out state by the phase-locked loop of said recording unit records equipment;

Computing module comprises obtaining unit, acquiring unit, computing unit, grouping computing unit and processing unit; Said acquisition unit is used to obtain the unusual moment of reference clock; Said acquiring unit was used for according to the unusual moment of said reference clock, obtained the crystal oscillator frequency controlling value of record in the Preset Time section of said reference clock before the unusual moment; Said computing unit is used for calculating the mean value of the crystal oscillator frequency controlling value of obtaining according to the crystal oscillator frequency controlling value of obtaining; Said grouping computing unit is used for the crystal oscillator frequency controlling value of obtaining is organized division, calculates the average of the crystal oscillator frequency controlling value of each grouping; Said processing unit be used to calculate the average of each grouping and the mean value of the crystal oscillator frequency controlling value of obtaining that calculates between difference; To current group; If the difference that calculates does not surpass preset difference value; Then keep said current group, the crystal oscillator frequency controlling value in dividing into groups according to each that keeps, the mean value of the crystal oscillator frequency controlling value that calculating keeps;

Module is set, the crystal oscillator frequency controlling value of control appliance system clock when being used to be provided with the mean value of crystal oscillator frequency controlling value of the reservation that calculates clock is unusual as a reference.

5. device as claimed in claim 4 is characterized in that, said acquiring unit comprises:

First searches subelement, is used for according to the unusual moment of said reference clock, begins to search forward from the unusual moment of said reference clock, obtains and searches the initial moment; It is said that to search the unusual time difference between constantly of the initial moment and said reference clock be said Preset Time section;

First obtains subelement, is used to obtain the crystal oscillator frequency controlling value of record in the said Preset Time section.

6. device as claimed in claim 4 is characterized in that, said acquiring unit comprises:

Second searches subelement, is used for according to the unusual moment of said reference clock, begins to search forward from the unusual moment of said reference clock, obtains and search the initial moment, searches to stop constantly; It is said that to search the time difference that initial moment and said searches between stopping constantly be said Preset Time section;

Second obtains subelement, is used to obtain the crystal oscillator frequency controlling value of record in the said Preset Time section.

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