CN114567392B - Uplink self-detection method for remote radio unit - Google Patents
Uplink self-detection method for remote radio unit Download PDFInfo
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- CN114567392B CN114567392B CN202210240411.2A CN202210240411A CN114567392B CN 114567392 B CN114567392 B CN 114567392B CN 202210240411 A CN202210240411 A CN 202210240411A CN 114567392 B CN114567392 B CN 114567392B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0446—Resources in time domain, e.g. slots or frames
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention provides a self-detection method for an uplink of a remote radio unit, and relates to the technical field of wireless communication. The method comprises the following steps: in the TDD mode, the self-detection signal is inserted into the GP time window of a special time slot in the wireless frame structure, the self-detection signal is coupled into the receiving channel through a preset scheme at the input end of the uplink filter through a multiplexed part of the downlink transmitting link. After the self-detection signal passes through the complete uplink receiving channel, the received signal is stored in the DDR. And (3) carrying out periodic data analysis on the received signals in the DDR, and detecting preset key indexes of the uplink so as to realize the performance self-checking of the uplink of the remote radio unit. The method utilizes the protection period of a special time slot in a wireless frame structure to transmit a self-detection signal, and the self-detection signal is coupled into a receiving channel through a preset scheme at the input end of an uplink filter, so that the self-detection of the uplink of a remote radio unit is carried out according to the coupled received signal.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a radio remote unit uplink self-detection method.
Background
In wireless communication, wireless access network interface opening, hardware white-box, software opening and network intellectualization are important trends. Network intelligence puts 2-way requirements on devices in the network: 1. the equipment can intelligently realize deployment and new function application; 2. the device has strong self-detection capability, can find problems by itself and even solve problems. The remote radio unit (RRU, remoteRadioUnit) is a core network element in a wireless communication network (2 g,3g,4g,5g,6g … …) that is responsible for converting digital signals into analog radio frequency signals and transmitting the radio frequency signals into a wireless environment, and may also receive radio frequency signals and convert the received radio frequency signals into digital signals. Therefore, the intelligentization of the remote radio unit is an important direction of future product development.
Remote units are typically deployed outdoors and operate in a relatively harsh environment. Meanwhile, with the continuous improvement of the requirements on wireless network coverage and the application of 5G technology, multi-channel (such as 64 channels) products and products with larger output power are deployed in a large quantity, and the products are large in size and heavy in weight, so that the cost of manual maintenance is greatly increased. According to the experience data, if one remote radio unit needs to return to the factory to locate the problem and overhaul the cost and the cost of the product are approximately 1:1. and after returning to the factory, about 30% of the products belong to the problem-free products, so that a great deal of manpower and financial resources are wasted.
Therefore, the remote radio unit has self-detection capability and has great significance for reducing maintenance cost. At present, the self-detection capability of the remote radio unit is very weak, and the uplink of the remote radio unit cannot be detected by itself, so that the maintenance of the product on site is greatly dependent on manual maintenance.
Disclosure of Invention
The invention aims to provide a self-detection method for an uplink of a remote radio unit, which is used for solving the problem that the uplink of the remote radio unit cannot be detected by itself in the prior art.
Embodiments of the present invention are implemented as follows:
the embodiment of the application provides a radio remote unit uplink self-detection method, which comprises the following steps:
in a TDD mode, inserting a self-detection signal into a GP time window of a special time slot in a wireless frame structure, coupling the self-detection signal into a receiving channel through a preset scheme at the input end of an uplink filter through a multiplexed part of downlink transmitting links;
after the self-detection signal passes through a complete uplink receiving channel, collecting a receiving signal in a digital chip, and storing the receiving signal in a DDR;
and (3) carrying out periodic data analysis on the received signals in the DDR, and detecting preset key indexes of the uplink so as to realize the performance self-checking of the uplink of the remote radio unit.
In some embodiments of the present invention, the step of coupling the self-detection signal into the receiving channel through a preset scheme at the input end of the uplink filter through the multiplexed part of the downlink transmission link includes:
the self-detection signal is transmitted through a multiplexing transmission channel, a single-pole double-throw switch is arranged at the output end of a first-stage amplifier of a multiplexing downlink channel based on the link budget of an uplink receiving channel, and the single-pole double-throw switch is used for switching a self-detection mode and a conventional transmission mode, wherein the single-pole double-throw switch is controlled by a digital chip, is switched to the self-detection mode in a GP time window and is switched to the conventional transmission mode in other time windows;
when in the self-detection mode, the self-detection signal is coupled into the receive channel from the downlink via the microstrip line at the input of the upstream filter.
In some embodiments of the present invention, the step of coupling the self-detection signal from the downlink into the receiving channel through the microstrip line at the input end of the upstream filter when in the self-detection mode includes:
for a multi-channel remote radio unit, after the self-detection signal is transmitted from the multiplexed transmitting channel, the self-detection signal is input to each independent receiving channel through the cascade one-to-two power dividers.
In some embodiments of the present invention, the step of switching to the self-detection mode within the GP time window includes:
in the GP time window, the self-detection signal is transmitted to the input end of the uplink filter through digital up-conversion, peak clipping, digital predistortion, a digital-to-analog converter and a first-stage power amplifier in sequence;
the self-detection signal is sent to the data acquisition module through digital down-conversion after analog-to-digital conversion.
In some embodiments of the present invention, the step of performing periodic data analysis on the received signal in the DDR to detect a preset key indicator of the uplink, so as to implement a performance self-test on the uplink of the remote radio unit includes:
using the formula by a digital power meter based on one symbol periodCalculating the average power of the self-detection signal to be transmitted, using the formula +.>Calculating the average power of the received self-detection signals, wherein k is the kth sampling point, x is the self-detection signal to be transmitted, y is the received self-detection signal, and M is the total sampling point number;
subtracting the average power of the self-detection signal to be transmitted from the average power of the received self-detection signal through a comparator to obtain a comparison result;
if the absolute value of the comparison result is larger than a first preset threshold, a link Gain abnormity alarm is sent out, and if the absolute value of the comparison result is smaller than the first preset threshold, a formula Gain is utilized in combination with link budget UL ＝Power y -(Power x +Gain DL ) The uplink Gain is calculated and the next detection period is entered, wherein Gain is the Gain, UL is the uplink, DL is the downlink, power is the calculated Power, x is the self-detection signal to be transmitted, and y is the received self-detection signal.
In some embodiments of the present invention, the step of performing periodic data analysis on the received signal in the DDR to detect a preset key indicator of the uplink, so as to implement a performance self-test on the uplink of the remote radio unit includes:
in the next self-detection period, no self-detection signal is sent, and the formula is utilized by the digital power meterCalculating a background noise Power without signal input, wherein Power n The average power of the noise signal is n, the noise signal is k, the k is the kth sampling point, and M is the total sampling point;
using the formula Power n-ARP ＝Power n -Gain UL Calculating to obtain air interface noise, wherein Gain UL Power for uplink gain n Power, the average Power of the noise signal n-ARP Noise average power of the air interface;
using the formula NF Estimated ＝Power n-ARP -Power n-Temp-ARP Calculating to obtain a noise coefficient estimated value, comparing the noise coefficient estimated value with a second preset threshold to judge whether the noise coefficient index in the uplink is in a normal working state, wherein NF Estimated Power for estimated noise figure n-ARP Power for noise average Power over air n-Temp-ARP Is the noise average power of the theoretical air interface.
In some embodiments of the present invention, the step of performing periodic data analysis on the received signal in the DDR to detect a preset key indicator of the uplink, so as to implement a performance self-test on the uplink of the remote radio unit includes:
after the received signal is subjected to frequency domain processing, the average power of the signal in the whole sampling bandwidth is calculated to obtain the interference power statistics of the uplink.
In some embodiments of the present invention, the self-detection signal has a length of two symbols, and the self-detection signal is identical on the two symbols.
In some embodiments of the present invention, the step of collecting the received signal in the digital chip includes:
data of two symbol lengths are collected.
In some embodiments of the present invention, the step of inserting the self-detection signal into the GP time window of the special slot in the radio frame structure in the TDD mode includes:
in the radio frame structure of TDD, according to the TDD configuration, a self-detection signal is inserted in the GP time window of a special slot.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
the invention provides a radio remote unit uplink self-detection method, which comprises the following steps: in the TDD mode, the self-detection signal is inserted into the GP time window of a special time slot in the wireless frame structure, the self-detection signal is coupled into the receiving channel through a preset scheme at the input end of the uplink filter through a multiplexed part of the downlink transmitting link. After the self-detection signal passes through the complete uplink receiving channel, the receiving signal is collected in the digital chip and stored in the DDR. And (3) carrying out periodic data analysis on the received signals in the DDR, and detecting preset key indexes of the uplink so as to realize the performance self-checking of the uplink of the remote radio unit. The method comprises the steps of firstly inserting a self-detection signal into a GP time window of a special time slot in a wireless frame structure, transmitting the self-detection signal by utilizing a protection period of the special time slot in the wireless frame structure, and coupling the self-detection signal into a receiving channel through a preset scheme at the input end of an uplink filter, so that the self-detection of an uplink of a remote radio unit is carried out according to the coupled received signal. After the self-detection signal passes through a complete uplink receiving channel, the received signal is stored in the DDR, and the received signal in the DDR is periodically subjected to data analysis, and preset key indexes such as the gain, noise coefficient, uplink interference detection and the like of an uplink are detected, so that the aim of performing performance self-detection on the uplink of the remote radio unit is fulfilled.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for uplink self-detection of a remote radio unit according to an embodiment of the present invention;
fig. 2 is a self-detection flow chart of an uplink of a remote radio unit according to an embodiment of the present invention;
fig. 3 is a flowchart of an uplink gain detection according to an embodiment of the present invention;
fig. 4 is a flowchart of uplink noise figure detection according to an embodiment of the present invention;
fig. 5 is a flowchart of uplink interference detection according to an embodiment of the present invention.
Icon: 1-an upstream filter; 2-single pole double throw switch; 4-a first stage power amplifier; 5-one-to-two power dividers; 6-DDR; 7-second stage power amplifier.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of 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 apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like, if any, are used solely for distinguishing the description and are not to be construed as indicating or implying relative importance.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the appearances of the element defined by the phrase "comprising one … …" do not exclude the presence of other identical elements in a process, method, article or apparatus that comprises the element.
In the description of the present application, it should be noted that, if the terms "upper," "lower," "inner," "outer," and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or an azimuth or the positional relationship that the product of the application is commonly put in use, it is merely for convenience of describing the present application and simplifying the description, and does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The various embodiments and features of the embodiments described below may be combined with one another without conflict.
Examples
Referring to fig. 1, fig. 1 is a flowchart of an uplink self-detection method of a remote radio unit according to an embodiment of the present application. The embodiment of the application provides a radio remote unit uplink self-detection method, which comprises the following steps:
s110: in the TDD mode, inserting the self-detection signal into a GP time window of a special time slot in a wireless frame structure, coupling the self-detection signal into a receiving channel through a preset scheme at the input end of an uplink filter 1 through a multiplexed part of downlink transmitting links;
specifically, in TDD (Time Division Duplexing, time division duplex) mode, the self-detection signal is inserted into a GP time window of a special time slot in the radio frame structure, the self-detection signal is transmitted by using a guard period of the special time slot in the radio frame structure, and after the self-detection signal is subjected to digital up-conversion, peak clipping, digital predistortion, digital-to-analog converter, and first-stage power amplifier 4, the self-detection signal is coupled to a receiving channel at an input end of the uplink filter 1 through a preset scheme, so that the self-detection of the uplink of the radio remote unit is performed according to the signal received by coupling.
The frame structure is defined in the wireless communication system. The frame structure includes 3 parts: uplink time slot, downlink time slot and special time slot. The special time slot is not a complete downlink time slot or an uplink time slot, but can be configured differently according to application scenarios. GP (Guard Period) time window is part of the frame format defined in the wireless communication protocol.
S120: after the self-detection signal passes through a complete uplink receiving channel, collecting a receiving signal in a digital chip, and storing the receiving signal into DDR 6;
the digital chip may be an FPGA or an ASIC, among others.
Specifically, after analog-to-digital conversion and digital down conversion are sequentially performed on the self-detection signal, the received signal is collected in a digital chip (FPGA or ASIC) and stored in DDR 6.
S130: and (3) carrying out periodic data analysis on the received signals in the DDR6, and detecting preset key indexes of the uplink so as to realize the performance self-checking of the uplink of the remote radio unit.
Specifically, data analysis is periodically performed on the received signals in the DDR6, and preset key indexes such as uplink gain, noise coefficient, uplink interference detection and the like are detected, so that the purpose of performing performance self-checking on the uplink of the remote radio unit is achieved.
Referring to fig. 2, fig. 2 is a flow chart of a self-detection of an uplink of a remote radio unit according to an embodiment of the invention. Within the GP time window, the multiplexed downlink acts on the self-detection mode. At this time, the single pole double throw switch 2 is switched to a self-detection signal receiving channel, after the self-detection signal is transmitted sequentially through digital up-conversion, peak clipping, digital predistortion, digital-to-analog converter, balun, BPF and first stage power amplifier 4, the self-detection signal is input to each independent receiving channel through the cascaded one-to-two power divider 5, the input end of the uplink filter 1 of each receiving channel couples the self-detection signal through the microstrip line, and the self-detection signal is sent into the DDR6 sequentially through Balun, BPF, ADC and digital down-conversion from the receiving front end for periodic analysis, thereby achieving the purpose of self-detection of the performance of the uplink of the remote radio unit. In other time windows, the self-detected signal is transmitted from the transmit channel via digital up-conversion, peak clipping, digital pre-distortion, digital-to-analog converter, balun, BPF, first stage power amplifier 4, second stage power amplifier 7, and filter in sequence.
Wherein, the function of the Balun is to increase the anti-interference capability of signals, and the function of the BPF is to pass only signals processed by the Balun.
In some implementations of this embodiment, the step of coupling the self-detection signal into the receiving channel at the input end of the upstream filter 1 through a preset scheme by using the multiplexed part of the downstream transmission link includes:
the self-detection signal is transmitted through a multiplexing transmission channel, a single-pole double-throw switch 2 is arranged at the output end of a first-stage amplifier of a multiplexing downlink channel based on the link budget of an uplink receiving channel, the single-pole double-throw switch 2 is used for switching a self-detection mode and a conventional transmission mode, wherein the single-pole double-throw switch 2 is controlled by a digital chip, is switched to the self-detection mode in a GP time window, and is switched to the conventional transmission mode in other time windows;
when in the self-detection mode, the self-detection signal is coupled into the receive channel from the downlink via a microstrip line at the input of the upstream filter 1.
The link budget of the uplink receiving channel is the budget of the gain, specifically, the gain planning is performed on the whole uplink according to the size of the received signal and the signal power expected by the baseband.
In the above implementation, a single pole double throw switch 2 is provided at the output of the first stage amplifier of the multiplexed downstream channel based on the gain budget for the entire uplink. Within the GP time window, the single pole double throw switch 2 switches to the self-detection signal receiving channel to switch to the self-detection mode. Specifically, the self-detection signal is transmitted through a multiplexed transmission channel, and is coupled to a receiving channel from a downlink through a coupler implemented by a microstrip line at the input end of the uplink filter 1, so that the self-detection of the uplink of the remote radio unit is performed according to the coupled received signal. In other time windows, the single pole double throw switch 2 switches to the normal receive path to switch to the normal transmit mode.
In some implementations of this embodiment, the step of coupling the self-detection signal from the downlink into the receiving channel through the microstrip line at the input end of the upstream filter 1 when in the self-detection mode includes:
for a multi-channel remote radio unit, after the self-detection signal is transmitted from the multiplexed transmitting channel, the self-detection signal is input to each independent receiving channel through the cascade one-to-two power divider 5.
Wherein the one-to-two power divider 5 functions to divide a single signal into multiple transmissions.
Specifically, the self-detection signal is periodically sent, and all receiving channels at each moment will receive the self-detection signal, so as to perform self-detection on all receiving channels at the same time.
In some implementations of the present embodiment, the step of switching to the self-detection mode within the GP time window includes:
in the GP time window, the self-detection signal is transmitted to the input end of the uplink filter 1 sequentially through digital up-conversion, peak clipping, digital predistortion, a digital-to-analog converter and a first-stage power amplifier 4;
the self-detection signal is sent to the data acquisition module through digital down-conversion after analog-to-digital conversion.
In particular, the multiplexed downlink will be operated in the self-detection mode during the GP time window. The self-detection signal is transmitted to the input end of the uplink filter 1 through wiring on the circuit board after digital up-conversion, peak clipping, digital predistortion, a digital-to-analog converter and the first stage power amplifier 4. The self-detection signal is coupled back to the receiving channel through a coupler implemented by a microstrip line. The self-detection signal is sent to the data acquisition module after analog-to-digital conversion and digital down-conversion.
Wherein the digital up-conversion serves to increase the signal sampling rate and obtain the desired performance of the received baseband signal by means of interpolation. The effect of peak clipping is to reduce the peak-to-average ratio of the signal. The digital predistortion has the function of improving the nonlinearity of the power amplifier, and the basic principle is that a predistortion signal is generated according to a feedback signal of a transmitting feedback channel and is superimposed on a forward input signal, so that the purpose of compensating the power amplifier distortion is achieved. The DAC, i.e. the digital-to-analog converter, functions to convert a digital signal into an analog signal. The role of the first stage power amplifier 4 is to amplify the signal to a desired power level. The filter functions to reduce the portion of the whole band other than the useful signal to a sufficiently low level. The ADC, i.e. the analog-to-digital converter, functions to convert an analog signal into a digital signal. The effect of digital down-conversion is to decimate the sampled signal to reduce the signal sampling rate and achieve the desired performance.
Referring to fig. 3, fig. 3 is a flowchart illustrating an uplink gain detection according to an embodiment of the invention. In some implementations of this embodiment, the step of performing periodic data analysis on the received signal in DDR6 to detect a preset key indicator of the uplink to implement a performance self-test on the uplink of the remote radio unit includes:
using the formula by a digital power meter based on one symbol periodCalculating the average power of the self-detection signal to be transmitted, using the formula +.>Calculating the average power of the received self-detection signals, wherein k is the kth sampling point, x is the self-detection signal to be transmitted, y is the received self-detection signal, and M is the total sampling point number;
subtracting the average power of the self-detection signal to be transmitted from the average power of the received self-detection signal through a comparator to obtain a comparison result;
if the absolute value of the comparison result is larger than a first preset threshold, a link Gain abnormity alarm is sent out, and if the absolute value of the comparison result is smaller than the first preset threshold, a formula Gain is utilized in combination with link budget UL ＝Power y -(Power x +Gain DL ) The uplink Gain is calculated and the next detection period is entered, wherein Gain is the Gain, UL is the uplink, DL is the downlink, power is the calculated Power, x is the self-detection signal to be transmitted, and y is the received self-detection signal.
Referring to fig. 4, fig. 4 is a flowchart illustrating an uplink noise figure detection according to an embodiment of the present invention. In some implementations of this embodiment, the step of performing periodic data analysis on the received signal in DDR6 to detect a preset key indicator of the uplink to implement a performance self-test on the uplink of the remote radio unit includes:
in the next self-detection period, no self-detection signal is sent, and the formula is utilized by the digital power meterCalculating a background noise Power without signal input, wherein Power n The average power of the noise signal is n, the noise signal is k, the k is the kth sampling point, and M is the total sampling point;
using the formula Power n-ARP ＝Power n -Gain UL Calculating to obtain air interface noise, wherein Gain UL Power for uplink gain n Power, the average Power of the noise signal n-ARP Noise average power of the air interface;
using the formula NF Estimated ＝Power n-ARP -Power n-Temp-ARP Calculating to obtain a noise coefficient estimated value, comparing the noise coefficient estimated value with a second preset threshold to judge whether the noise coefficient index in the uplink is in a normal working state, wherein NF Estimated Power for estimated noise figure n-ARP Power for noise average Power over air n-Temp-ARP Is the noise average power of the theoretical air interface.
In some implementations of this embodiment, the step of performing periodic data analysis on the received signal in DDR6 to detect a preset key indicator of the uplink to implement a performance self-test on the uplink of the remote radio unit includes:
after the received signal is subjected to frequency domain processing, the average power of the signal in the whole sampling bandwidth is calculated to obtain the interference power statistics of the uplink.
Referring to fig. 5, fig. 5 is a flowchart of uplink interference detection according to an embodiment of the present invention. The method comprises the steps of firstly, carrying out frequency domain processing on a received signal through a band-stop filter to filter out useful signals in a sampling bandwidth, then calculating the average power of the signals in the whole sampling bandwidth by utilizing a digital domain power meter, finally recording the interference state, such as the interference power, and entering the next detection period.
In some implementations of this embodiment, the self-detection signal has a length of two symbols, and the self-detection signal is identical on the two symbols. Therefore, a certain fault tolerance capability is provided, and the requirement for time synchronization when receiving the self-detection signal can be effectively reduced.
In some implementations of this embodiment, the step of collecting the received signal in the digital chip includes:
data of two symbol lengths are collected.
Specifically, the processing time delay of the whole remote radio unit is basically stable, so that the expected signal can be accurately acquired. And because the two symbol data of the self-detection signal are completely consistent, a certain fault tolerance capability is provided, and the digital chip is further ensured to be capable of acquiring the data with the complete symbol length.
In some implementations of this embodiment, in the TDD mode, the step of inserting the self-detection signal into the GP time window of the special slot in the radio frame structure includes:
in the radio frame structure of TDD, according to the TDD configuration, a self-detection signal is inserted in the GP time window of a special slot.
Specifically, the self-detection signal is inserted before digital up-conversion of the downlink. The self-detection signal can be set to a period T according to actual needs. In one period T, the self-detection signal acts on multiple channels in turn, i.e. only one channel acts on each time.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners as well. The apparatus embodiments described above are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present application may be integrated together to form a single part, or each module may exist alone, or two or more modules may be integrated to form a single part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (9)
1. The uplink self-detection method of the remote radio unit is characterized by comprising the following steps of:
in a TDD mode, inserting a self-detection signal into a GP time window of a special time slot in a wireless frame structure, wherein the self-detection signal is coupled into a receiving channel through a preset scheme at the input end of an uplink filter through a multiplexed part of downlink transmitting links; the method specifically comprises the following steps: the self-detection signal is transmitted through a multiplexing transmission channel, a single-pole double-throw switch is arranged at the output end of a first-stage amplifier of a multiplexing downlink channel based on the link budget of an uplink receiving channel, and the single-pole double-throw switch is used for switching a self-detection mode and a conventional transmission mode, wherein the single-pole double-throw switch is controlled by a digital chip, is switched to the self-detection mode in a GP time window and is switched to the conventional transmission mode in other time windows; when in the self-detection mode, coupling the self-detection signal from the downlink into a receiving channel through a microstrip line at the input end of an uplink filter;
after the self-detection signal passes through a complete uplink receiving channel, collecting a receiving signal in a digital chip, and storing the receiving signal into a DDR;
and carrying out periodic data analysis on the received signals in the DDR, and detecting preset key indexes of an uplink so as to realize the performance self-checking of the uplink of the remote radio unit.
2. The method according to claim 1, wherein the step of coupling the self-detection signal from the downlink into the reception channel through the microstrip line at the input of the uplink filter when in the self-detection mode comprises:
for the multi-channel remote radio unit, the self-detection signal is transmitted from the multiplexed transmitting channel and then is input to each independent receiving channel through the cascade one-to-two power dividers.
3. The method of claim 1, wherein the single pole double throw switch is controlled by a digital chip, and the step of switching to the self-test mode within the GP time window comprises:
in the GP time window, the self-detection signal is transmitted to the input end of the uplink filter sequentially through digital up-conversion, peak clipping, digital predistortion, a digital-to-analog converter and a first-stage power amplifier;
the self-detection signal is sent to a data acquisition module through digital down-conversion after analog-to-digital conversion.
4. The method for self-checking uplink of remote radio unit according to claim 1, wherein the step of performing periodic data analysis on the received signal in the DDR to detect a preset key indicator of the uplink to realize self-checking performance of the remote radio unit uplink comprises:
using the formula by a digital power meter based on one symbol periodCalculating the average power of the self-detection signal to be transmitted, using the formula +.>Calculating the average power of the received self-detection signals, wherein k is the kth sampling point, x is the self-detection signal to be transmitted, y is the received self-detection signal, and M is the total sampling point number;
subtracting the average power of the self-detection signal to be transmitted from the average power of the received self-detection signal through a comparator to obtain a comparison result;
if the absolute value of the comparison result is larger than a first preset threshold, a link Gain abnormity alarm is sent out, and if the absolute value of the comparison result is smaller than the first preset threshold, a formula Gain is utilized in combination with link budget UL ＝Power y -(Power x +Gain DL ) Calculate the uplink Gain and go to the next detection period, where Gain DL For gain, UL is uplink, DL is downlink, power y For the calculated power, x is the self-detection signal to be transmitted and y is the received self-detection signal.
5. The method for self-checking uplink of remote radio unit according to claim 4, wherein the step of performing periodic data analysis on the received signal in the DDR to detect a preset key indicator of the uplink to realize self-checking performance of the remote radio unit uplink comprises:
in the next self-detection period, no self-detection signal is sent, and the formula is utilized by the digital power meterCalculating a background noise Power without signal input, wherein Power n The average power of the noise signal is n, the noise signal is k, the k is the kth sampling point, and M is the total sampling point;
using the formula Power n-ARP ＝Power n -Gain UL Calculating to obtain air interface noise, wherein Gain UL Power for uplink gain n Power, the average Power of the noise signal n-ARP Noise average power of the air interface;
using the formula NF Estimated ＝Power n-ARP -Power n-Temp-ARP Calculating to obtain a noise coefficient estimated value, comparing the noise coefficient estimated value with a second preset threshold to judge whether the noise coefficient index in the uplink is in a normal working state, wherein NF Estimated For estimated noiseAcoustic coefficient, power n-ARP Power for noise average Power over air n-Temp-ARP Is the noise average power of the theoretical air interface.
6. The method for self-checking uplink of remote radio unit according to claim 1, wherein the step of performing periodic data analysis on the received signal in the DDR to detect a preset key indicator of the uplink to realize self-checking performance of the remote radio unit uplink comprises:
and after the received signal is subjected to frequency domain processing, calculating the average power of the signal in the whole sampling bandwidth to obtain the interference power statistics of the uplink.
7. The method of claim 1, wherein the self-test signal has a length of two symbols and is identical on both symbols.
8. The remote radio unit uplink self-test method according to claim 7, wherein said step of collecting the received signal in the digital chip comprises:
data of two symbol lengths are collected.
9. The remote radio unit uplink self-test method according to claim 1, wherein the step of inserting the self-test signal into the GP time window of the special slot in the radio frame structure in the TDD mode comprises:
in the radio frame structure of TDD, according to the TDD configuration, a self-detection signal is inserted in the GP time window of a special slot.
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