CN113328763A - Carrier power control method and device and radio remote unit - Google Patents
Carrier power control method and device and radio remote unit Download PDFInfo
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- CN113328763A CN113328763A CN202110619469.3A CN202110619469A CN113328763A CN 113328763 A CN113328763 A CN 113328763A CN 202110619469 A CN202110619469 A CN 202110619469A CN 113328763 A CN113328763 A CN 113328763A
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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Abstract
The application discloses a carrier power control method, a carrier power control device and a radio remote unit, wherein the method comprises the following steps: obtaining a first feedback power of an amplifier module in a radio remote unit under at least one processing mode; in the processing mode, the indoor baseband processing unit inputs a baseband signal to a digital control oscillator in the radio remote unit, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the radio remote unit after being shifted by the frequency of the digital control oscillator, so that the amplifier module outputs a carrier signal corresponding to the digital control oscillator; the different processing modes of the digital control oscillator have different shifting parameters for shifting the frequency of the baseband signal; obtaining an adjusting parameter corresponding to the digital control oscillator at least according to the first feedback power; and adjusting the gain parameter of the digitally controlled oscillator according to the adjustment parameter, so that the difference between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier power is smaller than a first fluctuation threshold.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a carrier power control method and apparatus, and a remote radio unit.
Background
A Radio remote unit (remote Radio unit) mixes baseband signals output by an indoor baseband processing unit (bbu) (building Base band unit) through a numerically controlled oscillator (nco) (numerically controlled oscillator) to output multiple paths of carrier signals with different frequencies. For the multi-carrier case, the difference between the power range of each carrier signal and the corresponding rated power is required to be within a preset power fluctuation range.
In a specific implementation, the RRU generally utilizes the flatness of the radio frequency device to ensure that the power fluctuation of a single carrier does not exceed 2.5 dB.
However, in the application scenario of large bandwidth multi-carrier, the power fluctuation of a single-path carrier cannot meet the requirement of not more than 2.5dB depending on the flatness of the rf device.
Disclosure of Invention
In view of the above, the present application provides a carrier power control method, apparatus and radio remote unit, as follows:
a carrier power control method, comprising:
obtaining a first feedback power of an amplifier module in a radio remote unit under at least one processing mode;
in the processing mode, the indoor baseband processing unit inputs a baseband signal to a digital control oscillator in the radio remote unit, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the radio remote unit after being shifted by the frequency of the digital control oscillator, so that the amplifier module outputs a carrier signal corresponding to the digital control oscillator; in different processing modes, the digital control oscillator has different shifting parameters for shifting the frequency of the baseband signal;
obtaining an adjusting parameter corresponding to the digital control oscillator at least according to the first feedback power;
and adjusting the gain parameter of the numerically controlled oscillator according to the adjustment parameter, so that the difference value between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold value.
Preferably, the method for obtaining the adjustment parameter corresponding to the digitally controlled oscillator according to at least the first feedback power includes:
obtaining a first difference value between the first feedback power and the feedback rated power corresponding to the processing mode;
and processing the first difference to obtain an adjusting parameter corresponding to the numerically controlled oscillator.
The method preferably processes the first difference, and includes:
screening out a first difference value that the signal frequency of the corresponding carrier signal is in a target carrier frequency range corresponding to the digital control oscillator from the first difference value;
and averaging the screened first difference values according to the number of the screened first difference values to obtain the corresponding adjusting parameters of the numerically controlled oscillator.
In the above method, preferably, the first feedback power is a power corrected by using a first temperature compensation power value, where the first temperature compensation power value is a compensation power value obtained according to a first temperature value of a radio frequency integrated circuit in the radio remote unit; the first temperature value of the radio frequency integrated circuit is a temperature value collected by the radio frequency integrated circuit in the processing mode.
In the method, preferably, the feedback rated power is the feedback power of the amplifier module when the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet a power consistency condition;
the feedback rated power is power corrected by using a second temperature compensation power value, and the second temperature compensation power value is a compensation power value obtained according to a second temperature value of a radio frequency integrated circuit in the radio remote unit; and the second temperature value of the radio frequency integrated circuit is the temperature value collected by the radio frequency integrated circuit under the condition that the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet the power consistency condition.
Preferably, the method for adjusting the gain parameter of the numerically controlled oscillator according to the adjustment parameter includes:
and writing the adjustment parameter into a first gain adjustment module corresponding to the digitally controlled oscillator, and adjusting the gain parameter of the digitally controlled oscillator by the first gain adjustment module so that the difference between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold.
In the above method, preferably, after the adjusting the gain parameter of the numerically controlled oscillator according to the adjustment parameter, the method further includes:
and in the operation process of the radio remote unit, adjusting a gain parameter of a second gain adjusting module in the radio remote unit so that the difference between the sum of the carrier power of the carrier signals output by the amplifier module and the total rated power of the carrier is smaller than a preset second fluctuation threshold.
Preferably, the method for adjusting the gain parameter of the second gain adjustment module in the remote radio unit includes:
obtaining a second feedback power of the amplifier module in the operation process of the remote radio unit;
obtaining a second difference between the feedback rated power and the second feedback power; the feedback rated power is the feedback power of the amplifier module under the condition that the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet the power consistency condition;
and writing the second difference value into a second gain adjustment module in the remote radio unit, and adjusting the gain parameter of the remote radio unit by the second gain adjustment module.
A carrier power control apparatus, comprising:
a feedback power obtaining unit, configured to obtain a first feedback power of an amplifier module in the radio remote unit in at least one processing mode;
in the processing mode, the indoor baseband processing unit inputs a baseband signal to a digital control oscillator in the radio remote unit, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the radio remote unit after being shifted by the frequency of the digital control oscillator, so that the amplifier module outputs a carrier signal corresponding to the digital control oscillator; in different processing modes, the digital control oscillator has different shifting parameters for shifting the frequency of the baseband signal;
an adjustment parameter obtaining unit, configured to obtain an adjustment parameter corresponding to the digitally controlled oscillator at least according to the first feedback power;
and the gain parameter adjusting unit is used for adjusting the gain parameter of the digital control oscillator according to the adjusting parameter, so that the difference value between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold value.
A remote radio unit comprising:
an amplifier module;
a frequency mixing module;
a digitally controlled oscillator;
a controller for obtaining a first feedback power of the amplifier module in at least one processing mode; obtaining an adjusting parameter corresponding to the digital control oscillator at least according to the first feedback power; adjusting the gain parameter of the numerically controlled oscillator according to the adjustment parameter, so that the difference value between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold value;
in the processing mode, the indoor baseband processing unit inputs a baseband signal to the digital control oscillator, and the baseband signal is subjected to frequency mixing processing by the frequency mixing module after being shifted by the frequency of the digital control oscillator, so that the amplifier module outputs a carrier signal corresponding to the digital control oscillator; and in different processing modes, the digital control oscillator has different shifting parameters for shifting the frequency of the baseband signal.
According to the above scheme, in the carrier power control method, the carrier power control device and the remote radio unit provided by the application, the baseband signal is input to the NCO in the RRU through the BBU, and the baseband signal is subjected to frequency mixing processing through the frequency shift of the NCO by the frequency mixing module in the RRU, so that the amplifier module outputs the carrier signal corresponding to the NCO, and thus, the adjustment parameter corresponding to the NCO can be obtained by obtaining the first feedback power of the amplifier module, and the gain parameter of the NCO is adjusted according to the adjustment parameter, so that the difference value between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier power is smaller than the first fluctuation threshold. Therefore, in the method and the device, the gain parameter of the NCO in the RRU is adjusted through the feedback power of the amplifier module in the RRU, so that the gain for frequency shifting of the NCO is compensated, the difference value between the carrier power of the carrier signal output by the amplifier module in the RRU and the carrier rated power corresponding to the carrier power is smaller than the first fluctuation threshold value, and the control of the carrier power is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flowchart of a carrier power control method according to an embodiment of the present application;
fig. 2 is an architecture diagram of an RRU in an embodiment of the present application;
fig. 3-fig. 4 are partial flow charts of a carrier power control method according to an embodiment of the present application;
fig. 5 is another flowchart of a carrier power control method according to an embodiment of the present application;
fig. 6 is another partial flowchart of a carrier power control method according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a carrier power control apparatus according to a second embodiment of the present application;
fig. 8 is another schematic structural diagram of a carrier power control apparatus according to a second embodiment of the present application;
fig. 9 is a schematic structural diagram of a remote radio unit according to a third embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, a flowchart is shown for implementing a carrier power control method provided in an embodiment of the present application, where the method is applicable to an RRU capable of outputting a carrier signal. The technical scheme in this embodiment is mainly used for controlling the carrier power of the carrier signal output by the RRU, so that the difference between the carrier power of the carrier signal and the carrier rated power is smaller than the fluctuation threshold.
Specifically, the method in this embodiment may include the following steps:
step 101: a first feedback power of an amplifier module in the remote radio unit in at least one processing mode is obtained.
In the processing mode, the BBU inputs a baseband signal to an NCO in the RRU, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the RRU after being shifted by the frequency of the NCO, so that the amplifier module outputs a carrier signal corresponding to the digital control oscillator; the NCO may shift the baseband signal in different processing modes according to different shift parameters, for example, the NCO may shift the baseband signal in different shift frequencies, so that the NCO may shift the baseband signal in different frequency to obtain different signal frequencies.
It should be noted that the NCO in this embodiment is an NCO that needs to be adjusted in the RRU to control the carrier power of the carrier signal. Because there may be one or more NCO in the RRU, in this embodiment, when a certain NCO is adjusted, no baseband signal is input to other NCO in the RRU or other NCO is controlled to stop working, so that the BBU inputs baseband signals to NCO that needs to be adjusted in the RRU in multiple processing modes, and the NCO in different processing modes has different shift parameters for frequency shift, thereby enabling the amplifier module to output corresponding carrier signals with different carrier frequencies. In the embodiment, the first feedback powers of the amplifier modules in different processing modes are obtained, so that one or more first feedback powers for the NCO required to be adjusted can be obtained.
As shown in fig. 2, at least three parts are included in the RRU: the Field Programmable Gate Array (FPGA) comprises at least a plurality of NCOs, a radio Frequency Integrated circuit (rfic) comprising at least a mixer module, and a Power Amplifier-Low Noise Amplifier (PA-LNA) comprising at least an Amplifier module, wherein the FPGA comprises a plurality of NCOs, and each NCO can be set with one or more shift parameters, so that the PA-LNA can output a carrier signal of a corresponding carrier Frequency range for each NCO.
Based on this, in one of the processing modes, the NCO on the FPGA, which receives the baseband signal input by the BBU, performs frequency shifting on the baseband signal, and after the NCO shifting, the NCO outputs an intermediate signal with the shifted frequency, and the intermediate signal is output to the frequency mixing module on the RFIC, and the frequency mixing module may mix the intermediate signal by using the local oscillator frequency, and then the intermediate signal is amplified by the amplifier module on the PA _ LNA to obtain the carrier signal.
In this embodiment, the first feedback power that can be read to the amplifier module in the FPGA can be FBReadingExpressed in dBFS.
Specifically, the FPGA further includes a crest factor reduction cfr (crest factor reduction) module and a digital pre-distortion (DPD) module, which are sequentially connected between the NCO and the frequency mixing module. However, in the processing mode of this embodiment, the CFR module and the DPD module are bypassed to increase the rate of carrier power adjustment.
Therefore, in the present embodiment, the feedback line of the amplifier module is connected from the amplifier module to the DPD module located before the NCO and the mixer module, so that the first feedback power fed back from the amplifier module can be read from the feedback input terminal of the DPD module in the FPGA.
Step 102: and obtaining an adjusting parameter corresponding to the digital control oscillator at least according to the first feedback power.
In this embodiment, the adjustment parameter may be obtained by analyzing the power value of the first feedback power, and the adjustment parameter may be used to adjust a gain parameter of the NCO.
For example, a threshold determination or a corresponding difference processing is performed on the magnitude of the power value of the first feedback power, so as to obtain an adjustment parameter.
Step 103: and adjusting the gain parameter of the digitally controlled oscillator according to the adjustment parameter, so that the difference value between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold value.
Specifically, in this embodiment, according to the adjustment parameter, the gain parameter in the frequency shift process of the NCO may be increased or decreased, so that a difference between the carrier power of the carrier signal output after the intermediate signal output after the NCO frequency shift reaches the amplifier module and the carrier rated power corresponding to the carrier power is smaller than the first fluctuation threshold, that is, in this embodiment, the feedback power of the amplifier module is used to adjust the gain of the frequency shift, so that the power fluctuation of the carrier signal is smaller.
It should be noted that the first fluctuation threshold may be adjusted according to the control accuracy, for example, the first fluctuation threshold is set to 2.5dB or 2dB, etc.
As can be seen from the foregoing solution, in the carrier power control method provided in this embodiment of the present application, a baseband signal is input to an NCO in an RRU through a BBU, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the RRU after being shifted by the frequency of the NCO, so that an amplifier module outputs a carrier signal corresponding to the NCO, and thus, an adjustment parameter corresponding to the NCO can be obtained by obtaining a first feedback power of the amplifier module, and a gain parameter of the NCO is adjusted according to the adjustment parameter, so that a difference between a carrier power of the carrier signal output by the amplifier module and a carrier rated power corresponding to the carrier power is smaller than a first fluctuation threshold. Therefore, in the method and the device, the gain parameter of the NCO in the RRU is adjusted through the feedback power of the amplifier module in the RRU, so that the gain for frequency shifting of the NCO is compensated, the difference value between the carrier power of the carrier signal output by the amplifier module in the RRU and the carrier rated power corresponding to the carrier power is smaller than the first fluctuation threshold value, and the control of the carrier power is realized.
In one implementation, when obtaining the adjustment parameter corresponding to the digitally controlled oscillator according to at least the first feedback power in step 102, the following may be specifically implemented, as shown in fig. 3:
step 301: a first difference value between a first feedback power corresponding to the processing mode and a feedback rated power is obtained.
The feedback rated power may be the feedback power of the amplifier module when the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power satisfy a power consistency condition. The measurement mode here is different from the processing mode.
Specifically, in combination with the structure shown in fig. 2, in the measurement mode, this embodiment may use the BBU to transmit a baseband signal to the RRU in advance, and keep a power value of the baseband signal, such as a power value at the DPD module, constant before the transmit power reaches the frequency mixing module, where the power value is the same as a calibration power value at an input port of the DPD module, at this time, a digital Step attenuator (dsa) connected to the frequency mixing module is adjusted by observing the carrier power of the carrier signal output by the amplifier module, so that the carrier power of the carrier signal output by the amplifier module is consistent with the carrier rated power, and when the carrier power of the carrier signal output by the amplifier module is consistent with the carrier rated power, reading the carrier power of the carrier signal output by the amplifier module, and reading the carrier power of the carrier signal output by the amplifier moduleThe feedback power read from the feedback input terminal of the DPD module in the FPGA to the amplifier module is the feedback rated power, and P can be usedFB ratingExpressed in dBFS.
Based on this, the first feedback power is subtracted from the feedback rated power to obtain a first difference. For example, PFB ratingSubtract FBReadingThe first difference value can be obtained.
Step 302: and processing the first difference to obtain an adjusting parameter corresponding to the numerically controlled oscillator.
Specifically, since there are one or more first feedback powers corresponding to one NCO, there are one or more first difference values obtained in this embodiment. In the present embodiment, when there is one first feedback power, the first difference may be directly used as an adjustment parameter corresponding to the NCO; in the present embodiment, when there are a plurality of first feedback powers, the corresponding plurality of first difference values may be averaged to obtain an adjustment parameter corresponding to the NCO.
In an implementation manner, in order to improve the accuracy of the first feedback power and further improve the accuracy of power control, in this embodiment, after the first feedback power is obtained, the first feedback power may be further corrected, and then the corrected first feedback power is used to obtain a corresponding first difference value, so as to obtain an adjustment parameter corresponding to the NCO, thereby implementing adjustment of a gain parameter of the NCO.
Specifically, in this embodiment, the first feedback power may be corrected by using a first temperature compensation power value, where the first temperature compensation power value is a compensation power value obtained according to a first temperature value of an RFIC in the RRU, and the first temperature value of the RFIC is a temperature value acquired by the RFIC in a processing mode, that is, in each processing mode, not only the first feedback power of the amplifier module is read, but also the first temperature value of the RFIC is acquired, and after the first feedback power is corrected by using the first temperature compensation power value corresponding to the first temperature value of the RFIC, the corrected first feedback power is used to obtain a corresponding first difference value, so as to obtain an adjustment parameter corresponding to the NCO, thereby implementing adjustment of a gain parameter of the NCO.
Based on this, after the first temperature value of the RFIC is obtained, the first corresponding relationship corresponding to the first temperature value is searched in the first power compensation list, so as to obtain the first temperature compensation power value, and then the first feedback power is corrected by using the first temperature compensation power value, for example, the first feedback power is subtracted from the first temperature compensation power value, so as to obtain the corrected first feedback power.
In an implementation manner, in order to improve the accuracy of the feedback rated power and further improve the accuracy of the power control, in this embodiment, after the feedback rated power is obtained in the measurement mode, the feedback rated power may be corrected, and then the corrected feedback rated power is used to obtain a corresponding first difference value, so as to obtain an adjustment parameter corresponding to the NCO, thereby implementing adjustment of the gain parameter of the NCO.
Specifically, in this embodiment, the feedback rated power may be corrected by using a second temperature compensation power value, where the second temperature compensation power value is a compensation power value obtained according to a second temperature value of an RFIC in the RRU, and the second temperature value of the RFIC is a temperature value acquired by the RFIC under the condition that the carrier power of the carrier signal output by the amplifier module and the carrier rated power satisfy a power coincidence condition in the measurement mode, that is, under the measurement mode, when the carrier power of the carrier signal output by the amplifier module and the carrier rated power satisfy the power coincidence condition, not only the feedback power of the amplifier module, that is, the feedback rated power, but also the second temperature value of the RFIC is acquired, and after the feedback rated power is corrected by using the second temperature compensation power value corresponding to the second temperature value of the RFIC, a corresponding first difference is obtained by using the corrected feedback rated power, and further obtaining an adjusting parameter corresponding to the NCO, and realizing the adjustment of the gain parameter of the NCO.
Based on this, after the second temperature value of the RFIC is obtained, the second corresponding relationship corresponding to the second temperature value is searched in the second power compensation list, so as to obtain the second temperature compensation power value, and then the feedback rated power is corrected by using the second temperature compensation power value, for example, the feedback rated power is subtracted from the second temperature compensation power value, so as to obtain the corrected feedback rated power.
Based on this, the first difference value can be obtained by subtracting the corrected first feedback power from the feedback rated power or the corrected feedback rated power, and the first difference value with higher accuracy is further processed to obtain the adjustment parameter corresponding to the NCO.
Further, in order to improve the accuracy of adjusting the parameter and further provide the accuracy of adjusting the power, step 302 in this embodiment may be specifically implemented in the following manner, as shown in fig. 4:
step 401: and screening out a first difference value that the signal frequency of the corresponding carrier signal is in a target carrier frequency range corresponding to the NCO in the first difference value.
In this embodiment, the carrier signals output by the amplifier module after the frequency shift of the NCO which needs to be adjusted are screened, the carrier signals of which the carrier frequencies are within the target carrier frequency range are screened, and then first difference values corresponding to the carrier signals within the target carrier frequency range are screened from the first difference values.
That is to say, in this embodiment, only the first difference corresponding to the processing mode in which the carrier signal is within the target carrier frequency range is required, and the carrier signal in the other processing modes is not within the target carrier frequency range, which belongs to the case that the NCO and mixer module and the amplifier module do not output an accurate carrier signal, in this case, the corresponding first difference is to be eliminated.
Step 402: and averaging the screened first difference values according to the number of the screened first difference values to obtain the corresponding adjusting parameters of the numerically controlled oscillator.
The number of the first differences to be screened out may be 0, or may be a value greater than or equal to 1.
Specifically, if the first difference values are not screened, that is, the number of the screened first difference values may be 0, the scheme in the embodiment may be executed again until the first difference values are screened; if only one first difference value is screened out, the first difference value can be directly used as an adjusting parameter corresponding to the NCO in the embodiment; if a plurality of first difference values are screened out, in this embodiment, averaging may be performed according to the number of the screened out first difference values, and then the obtained average value is used as an adjustment parameter corresponding to the NCO.
In one implementation manner, when the gain parameter of the digitally controlled oscillator is adjusted according to the adjustment parameter in step 103, the following may be specifically implemented:
and writing the adjustment parameters into a first gain adjustment module corresponding to the NCO, and adjusting the gain parameters of the NCO by the first gain adjustment module, so that the difference value between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold value.
The first gain adjustment module may be a gain adjustment module integrated into the NCO, or the first gain adjustment module may be a gain adjustment module connected to the NCO, as shown in fig. 2, so that the first gain adjustment module performs an increase or decrease process on the gain parameter in the frequency shifting process of the NCO by using the written adjustment parameter, so that the difference between the carrier power of the carrier signal output by the amplifier module for the NCO and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold.
It should be noted that the above power control scheme is a control scheme of carrier power performed before the RRU is shipped from a factory, and the carrier power of the RRU can be further continuously controlled in an actual working process after the RRU is shipped from the factory. Specifically, the method in this embodiment may further include the following steps, as shown in fig. 5:
step 104: and in the operation process of the RRU, adjusting gain parameters of a second gain adjusting module in the RRU so that the difference value between the sum of the carrier power of the carrier signals output by the amplifier module and the total rated power of the carrier is smaller than a preset second fluctuation threshold value.
In the operation process of the RRU, there may be multiple NCO in working state and perform frequency shifting on the received baseband signal, so the amplifier module may output multiple carrier signals, and in order to control the fluctuation of the sum of the carrier powers of these carrier signals, in this embodiment, the second gain adjustment module in the RRU is adjusted in gain parameters.
As shown in fig. 2, a second gain adjustment module is disposed between the CFR module and the DPD module, and in the operation process of the RRU, a gain parameter is adjusted by the second gain adjustment module, so that a difference between a sum of carrier powers of carrier signals output by the amplifier module and a total rated power of the carrier is smaller than a preset second fluctuation threshold.
The second fluctuation threshold here can be set according to the requirement, such as 2.5dB or 2 dB.
Specifically, step 104 may be implemented by the following method, as shown in fig. 6:
step 601: and obtaining a second feedback power of the amplifier module in the operation process of the RRU.
The second feedback power is the second feedback power collected by the amplifier module in the actual operation process after the RRU leaves the factory, and is different from the first feedback power of the amplifier module in the processing mode.
Specifically, referring to fig. 2, in the operation process of the RRU, in this embodiment, the second feedback power fed back from the amplifier module is read at the feedback input terminal on the DPD module in the FPGA.
Further, the second feedback power can use the temperature value collected by the RFIC during the RRU operation process to perform power compensation, so as to improve the accuracy of the second feedback power.
Step 602: a second difference between the feedback rated power and the second feedback power is obtained.
The feedback rated power is the feedback power of the amplifier module under the condition that the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet the power consistency condition. In addition, the feedback rated power can be used for performing power compensation on the temperature value collected by the RFIC in the measurement mode so as to improve the accuracy of the feedback rated power.
Specifically, in this embodiment, the power value at the DPDin and the power value at the FB may be read in the power control timeslot in the operation process of the RRU, the power value at the DPDin and the power value at the FB are subtracted, the power value at the DPDin and the feedback rated power are subtracted, and then the difference between the two differences is subtracted to obtain the second difference. That is, the second feedback power is subtracted from the feedback rated power to obtain a second difference.
Step 603: and writing the second difference value into a second gain adjusting module in the remote radio unit, and adjusting the gain parameter of the remote radio unit by the second gain adjusting module.
Specifically, in this embodiment, the second difference is written into the second gain adjustment module as an adjustment parameter in the actual operation process of the RRU, so that the second gain adjustment module adjusts the gain parameter of the RRU by using the written second difference, and thus the RRU can ensure that the fluctuation of the sum of the carrier powers of the carrier signals is smaller than the second fluctuation threshold by performing gain adjustment on the intermediate signal output by the NCO and mixed under the condition that the fluctuation of the carrier power of each carrier signal is kept smaller than the first fluctuation threshold.
Referring to fig. 7, a schematic structural diagram of a carrier power control apparatus provided in the second embodiment of the present application is shown, where the apparatus may be configured in an RRU capable of outputting a carrier signal. The technical scheme in this embodiment is mainly used for controlling the carrier power of the carrier signal output by the RRU, so that the difference between the carrier power of the carrier signal and the carrier rated power is smaller than the fluctuation threshold.
Specifically, the apparatus in this embodiment may include the following functional units:
a feedback power obtaining unit 701, configured to obtain a first feedback power of an amplifier module in the radio remote unit in at least one processing mode;
in the processing mode, the indoor baseband processing unit inputs a baseband signal to a digital control oscillator in the radio remote unit, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the radio remote unit after being shifted by the frequency of the digital control oscillator, so that the amplifier module outputs a carrier signal corresponding to the digital control oscillator; in different processing modes, the digital control oscillator has different shifting parameters for shifting the frequency of the baseband signal;
an adjustment parameter obtaining unit 702, configured to obtain an adjustment parameter corresponding to the digitally controlled oscillator according to at least the first feedback power;
a gain parameter adjusting unit 703, configured to adjust a gain parameter of the digitally controlled oscillator according to the adjustment parameter, so that a difference between a carrier power of a carrier signal output by the amplifier module and a carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold.
As can be seen from the foregoing solution, in the carrier power control device provided in the second embodiment of the present application, a baseband signal is input to an NCO in an RRU through a BBU, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the RRU after being shifted by the frequency of the NCO, so that an amplifier module outputs a carrier signal corresponding to the NCO, and thus, an adjustment parameter corresponding to the NCO can be obtained by obtaining a first feedback power of the amplifier module, and a gain parameter of the NCO is adjusted according to the adjustment parameter, so that a difference between a carrier power of the carrier signal output by the amplifier module and a carrier rated power corresponding to the carrier power is smaller than a first fluctuation threshold. Therefore, in the method and the device, the gain parameter of the NCO in the RRU is adjusted through the feedback power of the amplifier module in the RRU, so that the gain for frequency shifting of the NCO is compensated, the difference value between the carrier power of the carrier signal output by the amplifier module in the RRU and the carrier rated power corresponding to the carrier power is smaller than the first fluctuation threshold value, and the control of the carrier power is realized.
In an implementation manner, the adjustment parameter obtaining unit 702 is specifically configured to: obtaining a first difference value between the first feedback power and the feedback rated power corresponding to the processing mode; and processing the first difference to obtain an adjusting parameter corresponding to the numerically controlled oscillator. For example, in the first difference, a first difference that the signal frequency of the corresponding carrier signal is within a target carrier frequency range corresponding to the numerically controlled oscillator is screened out; and averaging the screened first difference values according to the number of the screened first difference values to obtain the corresponding adjusting parameters of the numerically controlled oscillator.
In an implementation manner, the first feedback power is a power corrected by using a first temperature compensation power value, where the first temperature compensation power value is a compensation power value obtained according to a first temperature value of a radio frequency integrated circuit in the radio remote unit; the first temperature value of the radio frequency integrated circuit is a temperature value collected by the radio frequency integrated circuit in the processing mode.
In one implementation, the feedback rated power is the feedback power of the amplifier module when the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet a power consistency condition;
the feedback rated power is power corrected by using a second temperature compensation power value, and the second temperature compensation power value is a compensation power value obtained according to a second temperature value of a radio frequency integrated circuit in the radio remote unit; and the second temperature value of the radio frequency integrated circuit is the temperature value collected by the radio frequency integrated circuit under the condition that the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet the power consistency condition.
In an implementation manner, the gain parameter adjusting unit 703 is specifically configured to: and writing the adjustment parameter into a first gain adjustment module corresponding to the digitally controlled oscillator, and adjusting the gain parameter of the digitally controlled oscillator by the first gain adjustment module so that the difference between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold.
In one implementation, the apparatus in this embodiment may further include the following units, as shown in fig. 8:
the closed-loop adjusting unit 704 is specifically configured to: in the operation process of the radio remote unit, adjusting a gain parameter of a second gain adjustment module in the radio remote unit so that a difference value between a sum of carrier powers of carrier signals output by the amplifier module and a total rated power of the carrier is smaller than a preset second fluctuation threshold, for example, in the operation process of the radio remote unit, a second feedback power of the amplifier module is obtained; obtaining a second difference between the feedback rated power and the second feedback power; the feedback rated power is the feedback power of the amplifier module under the condition that the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet the power consistency condition; and writing the second difference value into a second gain adjustment module in the remote radio unit, and adjusting the gain parameter of the remote radio unit by the second gain adjustment module.
It should be noted that, for the specific implementation of each unit in the present embodiment, reference may be made to the corresponding content in the foregoing, and details are not described here.
Referring to fig. 9, a schematic structural diagram of a remote radio unit according to a third embodiment of the present application is provided, where the remote radio unit may include at least the following components:
an amplifier module 901, which may be configured on the PA _ LNA;
a mixing module 902, which may be disposed on the RFIC;
the numerically controlled oscillator 903 may be disposed on the FPGA, and the radio remote unit may include a plurality of NCO;
a controller 904 for obtaining a first feedback power of the amplifier module 901 in at least one processing mode; obtaining an adjustment parameter corresponding to the numerically controlled oscillator 903 at least according to the first feedback power; adjusting the gain parameter of the numerically controlled oscillator 903 according to the adjustment parameter, so that a difference between the carrier power of the carrier signal output by the amplifier module 901 and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold;
in the processing mode, the indoor baseband processing unit inputs a baseband signal to the dco 903, and the baseband signal is subjected to frequency mixing processing by the frequency mixing module 902 after being shifted by the frequency of the dco 903, so that the amplifier module 901 outputs a carrier signal corresponding to the dco 903; in different processing modes, the digitally controlled oscillator 903 has different shifting parameters for shifting the frequency of the baseband signal.
As can be seen from the foregoing solution, in the carrier power control method provided in this embodiment of the present application, a baseband signal is input to an NCO in an RRU through a BBU, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the RRU after being shifted by the frequency of the NCO, so that an amplifier module outputs a carrier signal corresponding to the NCO, and thus, an adjustment parameter corresponding to the NCO can be obtained by obtaining a first feedback power of the amplifier module, and a gain parameter of the NCO is adjusted according to the adjustment parameter, so that a difference between a carrier power of the carrier signal output by the amplifier module and a carrier rated power corresponding to the carrier power is smaller than a first fluctuation threshold. Therefore, in the method and the device, the gain parameter of the NCO in the RRU is adjusted through the feedback power of the amplifier module in the RRU, so that the gain for frequency shifting of the NCO is compensated, the difference value between the carrier power of the carrier signal output by the amplifier module in the RRU and the carrier rated power corresponding to the carrier power is smaller than the first fluctuation threshold value, and the control of the carrier power is realized.
Taking the case that the base station type in 3GPP TS 38.101R16 Version is TypeC as an example, for the multi-carrier case, the fluctuation range of each carrier power is required to be ± 2.5dB, and the fluctuation range of single carrier power in the extreme case is ± 2 dB. Aiming at the defect that the IBW large-bandwidth multi-carrier application scene can not completely meet the power fluctuation requirement only by utilizing the flatness of a radio frequency link, the method provides a carrier power control scheme of the large-bandwidth multi-carrier, utilizes an FPGA in an RRU to spontaneously generate a baseband signal, reads the signal power at the FB in the FPGA, compares the read signal power at the FB with the rated power at the FB to obtain a gain compensation value of the RRU at the frequency point, and realizes the control of the carrier power.
Therefore, by the carrier power control scheme in the application, the power calibration precision can be improved, and the carrier power control index in 3GPP TS 38.101 can be better met, especially in an application scenario where the IBW bandwidth is very wide.
The specific carrier power control scheme is mainly divided into two steps, wherein the first step is power calibration before leaving a factory; the second step is closed loop power control after factory shipment.
In the first step, each RRU is power calibrated before factory shipment, and in combination with the RRU architecture shown in fig. 2, the PA _ LNA includes a coupler, a circulator and a filter in addition to the PA, and the RFIC includes a Digital-to-Analog Converter DAC (Analog-to-Digital Converter), an Analog-to-Digital Converter ADC (Analog-to-Digital Converter) and tx (transmit) -DSA in addition to the mixing module Mixer, and the FPGA includes a CW source and a signal Mixer in addition to the NCO1-NCOn, Gain Adjust Block 1 to Gain Adjust Block n, the CFR module and the DPD module, and the specific power calibration steps are as follows:
1. the Gain parameters of the first Gain adjustment module, such as Gain Adjust Block 1 to Gain Adjust Block n, are set to 0, i.e. there is no Gain adjustment;
2. the Gain parameter of the second Gain adjustment module, such as Gain Adjust Block, is set to 0, i.e. there is no Gain adjustment;
3. a CFR module and DPD module bypass;
4. the BBU side is used as a CW (continuous wave) source to send a CW signal, the power value of the sending power at the DPIN is constant, and the value is the same as the DPD module input port calibration power value and is marked as DPIN dBFS;
5. by observing the signal power value of the frequency spectrograph arranged at the output end of the PA-LAN, the TX-DSA in the RFIC is adjusted to ensure that the power value observed at the frequency spectrograph side meets the power value P of a single-channel antenna portRated value(ii) a At this time, reading the power value at FB inside the FPGA, and marking the value as PFB ratingdBFS；
6. Replacing the frequency spectrograph with a load or an attenuator (or not), fixing an internal TX-DSA (for example, 10dB) of the RFIC, transmitting a CW signal (other NCO are in a state of not receiving the CW signal) by a BBU side when the NCO is at the starting point of the radio frequency bandwidth, reading power values at DPdIn and FB, wherein the reading of the power value at the DPdIn is to check whether the input power of the DPD module is changed or not when the power is calibrated, and the reading of the power value at the FB is recorded as FBReading(ii) a And reading the value of a temperature sensor at the RFIC (radio frequency integrated circuit) of the RRU, obtaining a corresponding temperature compensation value Q according to the temperature value, and reading-Q by the FB to obtain the FB power value of the frequency point at normal temperature. Calculating PFB rating-(FBReading-Q) is denoted as a 1; of course, PFB ratingThe rated power after temperature compensation can also be used;
7. adjusting the moving frequency by NCO every 10MHz frequency interval, repeating the step 6 to obtain A2 and A3 … Am, wherein m is the number of CW test signals which can be contained in the whole radio frequency bandwidth;
8. calculating the number k of CW signals of which the carrier frequency falls into a corresponding carrier range according to the actual carrier center frequency and the carrier bandwidth, and averaging the corresponding A value set in the step 7 to obtain parameters C1 and C2 … Cn, wherein n is the carrier number;
9. and (4) writing the calculation result obtained in the step (8) into a first Gain adjustment module Gain adjustment Block after the corresponding NCO, and finishing the power calibration.
After the RRU leaves the factory, the closed loop power control steps are as follows:
1. reading power values at a DPIN and a FB in a power control time slot in the RRU operation process, and calculating a difference value e between the DPIN and the FB;
2. the calculation results e and f (DPD) in step 1 are comparedin-PFB rating) Calculating a difference value to obtain a result g;
3. and writing the calculation result of the step 2 into a second Gain adjustment module Gain Adjust Block in the figure 2 to complete the closed-loop power control for one time.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A carrier power control method, comprising:
obtaining a first feedback power of an amplifier module in a radio remote unit under at least one processing mode;
in the processing mode, the indoor baseband processing unit inputs a baseband signal to a digital control oscillator in the radio remote unit, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the radio remote unit after being shifted by the frequency of the digital control oscillator, so that the amplifier module outputs a carrier signal corresponding to the digital control oscillator; in different processing modes, the digital control oscillator has different shifting parameters for shifting the frequency of the baseband signal;
obtaining an adjusting parameter corresponding to the digital control oscillator at least according to the first feedback power;
and adjusting the gain parameter of the numerically controlled oscillator according to the adjustment parameter, so that the difference value between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold value.
2. The method of claim 1, obtaining the corresponding tuning parameter of the numerically controlled oscillator according to at least the first feedback power, comprising:
obtaining a first difference value between the first feedback power and the feedback rated power corresponding to the processing mode;
and processing the first difference to obtain an adjusting parameter corresponding to the numerically controlled oscillator.
3. The method of claim 2, processing the first difference value, comprising:
screening out a first difference value that the signal frequency of the corresponding carrier signal is in a target carrier frequency range corresponding to the digital control oscillator from the first difference value;
and averaging the screened first difference values according to the number of the screened first difference values to obtain the corresponding adjusting parameters of the numerically controlled oscillator.
4. The method of claim 2, wherein the first feedback power is a power modified by a first temperature compensation power value, and the first temperature compensation power value is a compensation power value obtained according to a first temperature value of a radio frequency integrated circuit in the radio remote unit; the first temperature value of the radio frequency integrated circuit is a temperature value collected by the radio frequency integrated circuit in the processing mode.
5. The method of claim 2, wherein the feedback rated power is the feedback power of the amplifier module when the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet a power consistency condition;
the feedback rated power is power corrected by using a second temperature compensation power value, and the second temperature compensation power value is a compensation power value obtained according to a second temperature value of a radio frequency integrated circuit in the radio remote unit; and the second temperature value of the radio frequency integrated circuit is the temperature value collected by the radio frequency integrated circuit under the condition that the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet the power consistency condition.
6. The method of claim 1, adjusting a gain parameter of the numerically controlled oscillator according to the adjustment parameter, comprising:
and writing the adjustment parameter into a first gain adjustment module corresponding to the digitally controlled oscillator, and adjusting the gain parameter of the digitally controlled oscillator by the first gain adjustment module so that the difference between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold.
7. The method of claim 1, after adjusting a gain parameter of the numerically controlled oscillator according to the adjustment parameter, the method further comprising:
and in the operation process of the radio remote unit, adjusting a gain parameter of a second gain adjusting module in the radio remote unit so that the difference between the sum of the carrier power of the carrier signals output by the amplifier module and the total rated power of the carrier is smaller than a preset second fluctuation threshold.
8. The method of claim 7, wherein adjusting the gain parameter of a second gain adjustment module in the remote radio unit comprises:
obtaining a second feedback power of the amplifier module in the operation process of the remote radio unit;
obtaining a second difference between the feedback rated power and the second feedback power; the feedback rated power is the feedback power of the amplifier module under the condition that the carrier power of the carrier signal output by the amplifier module in the measurement mode and the carrier rated power meet the power consistency condition;
and writing the second difference value into a second gain adjustment module in the remote radio unit, and adjusting the gain parameter of the remote radio unit by the second gain adjustment module.
9. A carrier power control apparatus, comprising:
a feedback power obtaining unit, configured to obtain a first feedback power of an amplifier module in the radio remote unit in at least one processing mode;
in the processing mode, the indoor baseband processing unit inputs a baseband signal to a digital control oscillator in the radio remote unit, and the baseband signal is subjected to frequency mixing processing by a frequency mixing module in the radio remote unit after being shifted by the frequency of the digital control oscillator, so that the amplifier module outputs a carrier signal corresponding to the digital control oscillator; in different processing modes, the digital control oscillator has different shifting parameters for shifting the frequency of the baseband signal;
an adjustment parameter obtaining unit, configured to obtain an adjustment parameter corresponding to the digitally controlled oscillator at least according to the first feedback power;
and the gain parameter adjusting unit is used for adjusting the gain parameter of the digital control oscillator according to the adjusting parameter, so that the difference value between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold value.
10. A remote radio unit comprising:
an amplifier module;
a frequency mixing module;
a digitally controlled oscillator;
a controller for obtaining a first feedback power of the amplifier module in at least one processing mode; obtaining an adjusting parameter corresponding to the digital control oscillator at least according to the first feedback power; adjusting the gain parameter of the numerically controlled oscillator according to the adjustment parameter, so that the difference value between the carrier power of the carrier signal output by the amplifier module and the carrier rated power corresponding to the carrier signal is smaller than a preset first fluctuation threshold value;
in the processing mode, the indoor baseband processing unit inputs a baseband signal to the digital control oscillator, and the baseband signal is subjected to frequency mixing processing by the frequency mixing module after being shifted by the frequency of the digital control oscillator, so that the amplifier module outputs a carrier signal corresponding to the digital control oscillator; and in different processing modes, the digital control oscillator has different shifting parameters for shifting the frequency of the baseband signal.
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