CN114567392A - Radio remote unit uplink self-detection method - Google Patents

Radio remote unit uplink self-detection method Download PDF

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CN114567392A
CN114567392A CN202210240411.2A CN202210240411A CN114567392A CN 114567392 A CN114567392 A CN 114567392A CN 202210240411 A CN202210240411 A CN 202210240411A CN 114567392 A CN114567392 A CN 114567392A
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self
uplink
detection signal
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CN114567392B (en
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魏旻
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Sichuan Hengwan Technology Co Ltd
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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
    • 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
    • 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
    • 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 radio remote unit uplink self-detection method, and relates to the technical field of wireless communication. The method comprises the following steps: in the TDD mode, a self-detection signal is inserted into a GP time window of a special time slot in a wireless frame structure, passes through a multiplexed part of a downlink transmitting link, and is coupled into a receiving channel at the input end of an uplink filter through a preset scheme. And after the self-detection signal passes through the complete uplink receiving channel, storing the received signal into the DDR. And carrying out periodic data analysis on a received signal in the DDR, and detecting a preset key index of an uplink to realize the performance self-check of the uplink of the radio frequency remote unit. The method utilizes a protection period of a special time slot in a wireless frame structure to transmit a self-detection signal, couples the self-detection signal into a receiving channel through a preset scheme at the input end of an uplink filter, and thus carries out self-detection on an uplink of a radio remote unit according to the coupled and received signal.

Description

Radio remote unit uplink self-detection method
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, the opening of radio access network interfaces, hardware white-box, software development, and network intelligence are important trends. Network intelligence puts 2 demands on devices in the network: 1. the equipment can intelligently realize deployment and new function application; 2. the device has strong self-detection capability, and can find or even solve problems by itself. A Remote Radio Unit (RRU) is a core network element in a wireless communication network (2G, 3G, 4G, 5G, 6G … …), and is responsible for converting a digital signal into an analog radio signal and transmitting the radio signal to a wireless environment, and also can receive a wireless radio signal and convert the received radio signal into a digital signal. Therefore, the intelligentization of the remote radio unit is an important direction for the development of future products.
The remote radio units are usually deployed outdoors, and the operating environment is relatively harsh. Meanwhile, with the increasing requirements on wireless network coverage and the application of 5G technology, a large number of multi-channel (such as 64-channel) products and products with larger output power are deployed, and such products have large volume and heavy weight, which greatly increases the cost of manual maintenance. According to the empirical data, if a radio remote unit needs to return to the factory to locate the problem and overhaul the cost and the cost of the product per se are about 1: 1. after returning to the factory, approximately 30% of the products belong to problem-free products, and thus, it is seen that a large amount of manpower and financial resources are wasted.
Therefore, the remote radio unit has the self-detection capability and has great significance for reducing the maintenance cost. At present, the self-detection capability of the remote radio unit is very weak, and self-detection cannot be performed on an uplink of the remote radio unit, so that the maintenance of a product on site greatly depends on manual maintenance.
Disclosure of Invention
The present invention is directed to a method for self-detecting an uplink of a radio remote unit, so as to solve the problem that the uplink of the radio remote unit cannot be self-detected in the prior art.
The embodiment of the invention is realized by the following steps:
the embodiment of the application provides a method for self-detecting an uplink of a radio remote unit, 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, wherein the self-detection signal passes through a multiplexed part of a downlink transmitting link and is coupled into a receiving channel at the input end of an uplink filter through a preset scheme;
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 (double data rate);
and carrying out periodic data analysis on a received signal in the DDR, and detecting a preset key index of an uplink to realize the performance self-check of the uplink of the radio frequency remote unit.
In some embodiments of the present invention, the step of coupling the self-detection signal into the receiving channel by a preset scheme at the input end of the uplink filter through the multiplexed part of the downlink transmitting link includes:
the self-detection signal is transmitted through the multiplexed transmitting channel, and based on the link budget of the uplink receiving channel, a single-pole double-throw switch is arranged at the output end of a first-stage amplifier of the multiplexed downlink channel and used for switching between a self-detection mode and a conventional transmitting mode, wherein the single-pole double-throw switch is controlled by a digital chip and is switched to the self-detection mode in a GP time window and is switched to the conventional transmitting mode in other time windows;
when in the self-test mode, a self-test signal is coupled from the downlink into the receive path through a microstrip line at the input of the upstream filter.
In some embodiments of the present invention, the step of coupling the self-detection signal into the receiving channel from the downlink through the microstrip line at the input end of the uplink filter when in the self-detection mode includes:
for a multi-channel remote radio unit, a self-detection signal is transmitted from a multiplexed transmitting channel and then is input to each independent receiving channel through a cascaded one-to-two power divider.
In some embodiments of the present invention, the step of switching to the self-detection mode within the GP time window includes:
in a GP time window, a self-detection signal is transmitted to the input end of an up filter through digital up-conversion, peak clipping, digital pre-distortion, 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 being subjected to 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 performance self-checking on the uplink of the radio remote unit includes:
using formula by digital power meter based on one symbol period
Figure BDA0003540891540000031
Calculating the average power of the self-detection signal to be transmitted by using a formula
Figure BDA0003540891540000032
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 number of sampling points;
carrying out subtraction operation on the average power of the self-detection signal to be transmitted and 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 greater than a first preset threshold, a link Gain abnormal alarm is sent out, and if the absolute value of the comparison result is less than the first preset threshold, a formula Gain is utilized in combination with link budgetUL＝Powery-(Powerx+GainDL) And calculating the Gain of an uplink, and entering the next detection period, 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 performance self-checking on the uplink of the radio remote unit includes:
in the next self-detection period, the self-detection signal is not transmitted, and the formula is utilized by the digital power meter
Figure BDA0003540891540000041
Calculating the background noise Power at no signal input, wherein PowernThe average power of the noise signal is shown, n is the noise signal, k is the kth sampling point, and M is the total number of sampling points;
using the formula Powern-ARP＝Powern-GainULCalculating to obtain air interface noise, wherein GainULFor uplink gain, PowernFor noise signal average Power, Powern-ARPIs the noise average power of the air interface;
using the formula NFEstimated＝Powern-ARP-Powern-Temp-ARPCalculating to obtain a noise coefficient estimation value, and comparing the noise coefficient estimation value with a second preset threshold to judge whether the noise coefficient index in the uplink is in a normal working state, wherein NF isEstimatedFor estimated noise figure, Powern-ARPPower for noise average Power at the air interfacen-Temp-ARPWhich is the theoretical noise average power at the 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 performance self-checking on the uplink of the radio remote unit includes:
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.
In some embodiments of the present invention, the length of the self-detection signal is 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 a GP time window of a special timeslot in the radio frame structure in the TDD mode includes:
in the radio frame structure of TDD, according to TDD configuration, inserting self-detection signal in GP time window of special time 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, a self-detection signal is inserted into a GP time window of a special time slot in a wireless frame structure, passes through a multiplexed part of a downlink transmitting link, and is coupled into a receiving channel at the input end of an uplink filter through a preset scheme. And after the self-detection signal passes through the complete uplink receiving channel, collecting a receiving signal in the digital chip and storing the receiving signal into the DDR. And carrying out periodic data analysis on a received signal in the DDR, and detecting a preset key index of an uplink to realize the performance self-check of the uplink of the radio frequency remote 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 guard period of the special time slot in the wireless frame structure, coupling the self-detection signal into a receiving channel at the input end of an uplink filter through a preset scheme, and thus carrying out self-detection on an uplink of a radio remote unit according to the coupled and received signal. After the self-detection signal passes through the complete uplink receiving channel, the received signal is stored in the DDR, data analysis is periodically carried out on the received signal in the DDR, and preset key indexes such as gain, noise coefficient and uplink interference detection of an uplink are detected, so that the purpose of carrying out performance self-detection on the uplink of the radio remote unit is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
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 flowchart illustrating a self-detection process of an uplink of a remote radio unit according to an embodiment of the present invention;
fig. 3 is a flowchart of 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 divider; 6-DDR; 7-second stage power amplifier.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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 some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not construed as indicating or implying relative importance.
It should be noted that, in this document, 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. Also, 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 presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like 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", etc. are used to indicate an orientation or positional relationship based on that shown in the drawings or that the application product is usually placed in use, the description is merely for convenience and simplicity, and it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore should not be construed as limiting the present application.
In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the individual features of the embodiments can be combined with one another without conflict.
Examples
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for uplink self-detection of a remote radio unit according to an embodiment of the present application. The embodiment of the application provides a method for self-detecting an uplink of a radio remote unit, which comprises the following steps:
s110: 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 passes through a multiplexed part of a downlink transmitting link and is coupled into a receiving channel at the input end of an uplink filter 1 through a preset scheme;
specifically, in a TDD (Time Division duplex) mode, a self-detection signal is inserted into a GP Time window of a special Time slot in a 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 passes through digital up-conversion, peak clipping, digital pre-distortion, a digital-to-analog converter, and a first-stage power amplifier 4, the self-detection signal is coupled to a receiving channel at an input end of an uplink filter 1 by a preset scheme, so that self-detection of an uplink of a radio remote unit is performed according to the coupled and received signal.
In the wireless communication system, a frame structure definition method is adopted. The frame structure includes 3 parts: uplink time slot, downlink time slot and special time slot. The special timeslot is not a complete downlink timeslot or uplink timeslot, but different configurations may be performed in the timeslot according to application scenarios. A GP (Guard Period) time window, which is part of a frame format defined in a 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 can be an FPGA or an ASIC.
Specifically, after the self-detection signal is subjected to analog-to-digital conversion and digital down-conversion in sequence, the received signal is collected in a digital chip (FPGA or ASIC) and stored in the DDR 6.
S130: and carrying out periodic data analysis on a received signal in the DDR6, and detecting a preset key index of an uplink to realize the performance self-check of the uplink of the radio frequency remote unit.
Specifically, data analysis is periodically performed on a received signal in the DDR6, and preset key indexes such as gain, noise coefficient, uplink interference detection and the like of an uplink are detected, so that the purpose of performing performance self-inspection on the uplink of the radio remote unit is achieved.
Referring to fig. 2, fig. 2 is a flowchart illustrating a self-detection of an uplink of a remote radio unit according to an embodiment of the present invention. Within the GP time window, the multiplexed downlink acts in self-detection mode. At this time, the single-pole double-throw switch 2 is switched to a self-detection signal receiving channel, a self-detection signal is transmitted by a digital up-conversion, a peak clipping, a digital pre-distortion, a digital-to-analog converter, Balun, a BPF and a first-stage power amplifier 4 in sequence and then is input to each independent receiving channel through a cascaded one-to-two power divider 5, the input end of an uplink filter 1 of each receiving channel is coupled with the self-detection signal through a microstrip line, and the self-detection signal is sent to a DDR6 from a receiving front end through Balun, BPF, an ADC and a digital down-conversion in sequence to be periodically analyzed, so that the purpose of performance self-detection of an uplink of a radio remote unit is achieved. In other time windows, the self-detection signal is transmitted from the transmitting channel through 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 signal interference resistance, and the function of the BPF is to only let the signal processed by the Balun pass.
In some embodiments of this embodiment, the step of coupling the self-detection signal into the receiving channel by a preset scheme at the input end of the uplink filter 1 through the multiplexed part of the downlink transmission link includes:
the self-detection signal is transmitted through a multiplexing transmitting channel, based on the link budget of an uplink receiving channel, a single-pole double-throw switch 2 is arranged at the output end of a first-stage amplifier of a multiplexing downlink channel, and the single-pole double-throw switch 2 is used for switching a self-detection mode and a conventional transmitting 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 transmitting mode in other time windows;
when in the self-detection mode, the self-detection signal is coupled into the receive path from the downlink through a microstrip line at the input of the up filter 1.
The link budget of the uplink receiving channel refers to a gain budget, and specifically, the gain of the entire uplink is planned according to the size of the received signal and the signal power expected by the baseband.
In the implementation process, based on the gain budget of the whole uplink, a single-pole double-throw switch 2 is arranged at the output end of the first-stage amplifier of the multiplexed downlink channel. In the GP time window, the single-pole double-throw switch 2 is switched to the self-test signal receiving channel to switch to the self-test mode. Specifically, the self-detection signal is transmitted through a multiplexed transmission channel, the self-detection signal is coupled to a reception channel from a downlink through a coupler realized by a microstrip line at the input end of the uplink filter 1, and then the self-detection of the uplink of the radio remote unit is performed according to the coupled and received signal. Within other time windows, the single pole double throw switch 2 switches to the conventional receive channel to switch to the conventional transmit mode.
In some embodiments of the present embodiment, the step of coupling the self-detection signal into the receiving channel from the downlink through the microstrip line at the input end of the uplink filter 1 when in the self-detection mode includes:
for the multi-channel remote radio unit, the self-detection signal is transmitted from the multiplexed transmitting channel and then input to each independent receiving channel through the cascaded one-to-two power divider 5.
The one-to-two power divider 5 is used for dividing the single signal into multiple paths for transmission.
Specifically, the self-detection signal is periodically transmitted, and all receiving channels receive the self-detection signal at each time, so as to perform self-detection on all receiving channels at the same time.
In some embodiments of the present invention, the step of switching to the self-detection mode within the GP time window by the single-pole double-throw switch 2 controlled by the digital chip includes:
in a GP time window, a self-detection signal is transmitted to the input end of an uplink filter 1 through a digital up-conversion, a peak clipping, a digital pre-distortion, a digital-to-analog converter and a first-stage power amplifier 4 in sequence;
the self-detection signal is sent to the data acquisition module through digital down-conversion after being subjected to analog-to-digital conversion.
Specifically, within the GP time window, the multiplexed downlink will be active in self-detection mode. The self-detection signal is transmitted to the input end of the uplink filter 1 through the wiring on the circuit board after passing through the digital up-conversion, peak clipping, digital pre-distortion, the digital-to-analog converter and the first-stage power amplifier 4. The self-detection signal is coupled back to the receiving channel through the coupler realized by the microstrip line. The self-detection signal is sent to the data acquisition module after being subjected to analog-to-digital conversion and digital down-conversion.
The digital up-conversion is used to improve the sampling rate of the received baseband signal by means of interpolation and to obtain the desired performance. The peak clipping effect 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 transmission feedback channel and is superposed on a forward input signal, so that the aim of compensating the power amplifier distortion is fulfilled. The DAC, i.e., the digital-to-analog converter, functions to convert a digital signal into an analog signal. The first stage power amplifier 4 functions to amplify the signal to a desired power level. The filter functions to reduce other parts than the useful signal over the entire frequency band 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 uplink gain detection according to an embodiment of the present invention. In some embodiments of this embodiment, the step of performing periodic data analysis on the received signal in the DDR6 and detecting a preset key indicator of the uplink to implement self-checking of the performance of the uplink of the radio remote unit includes:
using formula by digital power meter based on one symbol period
Figure BDA0003540891540000121
Calculating the average power of the self-detection signal to be transmitted by using a formula
Figure BDA0003540891540000122
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 number of sampling points;
carrying out subtraction operation on the average power of the self-detection signal to be transmitted and 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 greater than a first preset threshold, a link Gain abnormal alarm is sent out, and if the absolute value of the comparison result is less than the first preset threshold, a formula Gain is utilized in combination with link budgetUL＝Powery-(Powerx+GainDL) And calculating the Gain of an uplink, and entering the next detection period, 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 uplink noise figure detection according to an embodiment of the present invention. In some embodiments of this embodiment, the step of performing periodic data analysis on the received signal in the DDR6 and detecting a preset key indicator of the uplink to implement self-checking of the performance of the uplink of the radio remote unit includes:
in the next self-test period, the self-test signal is not sent, and the formula is used by the digital power meter
Figure BDA0003540891540000131
Calculating the background noise Power at no signal input, wherein PowernThe average power of the noise signal is shown, n is the noise signal, k is the kth sampling point, and M is the total number of sampling points;
using the formula Powern-ARP＝Powern-GainULCalculating to obtain air interface noise, wherein GainULFor uplink gain, PowernFor noise signal average Power, Powern-ARPNoise average power for the air interface;
using the formula NFEstimated＝Powern-ARP-Powern-Temp-ARPCalculating to obtain a noise coefficient estimation value, and comparing the noise coefficient estimation value with a second preset threshold to judge whether the noise coefficient index in the uplink is in a normal working state, wherein NF isEstimatedFor estimated noise figure, Powern-ARPPower for noise average Power at the air interfacen-Temp-ARPWhich is the theoretical noise average power of the air interface.
In some embodiments of this embodiment, the step of performing periodic data analysis on the received signal in the DDR6 and detecting a preset key indicator of the uplink to implement self-checking of the performance of the uplink of the radio remote unit includes:
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.
Referring to fig. 5, fig. 5 is a flowchart illustrating uplink interference detection according to an embodiment of the present invention. Firstly, carrying out frequency domain processing on a received signal through a band elimination filter to filter out useful signals in a sampling bandwidth, then calculating the average power of the signals in the whole sampling bandwidth by using a digital domain power meter, finally recording an interference state, such as the interference power, and entering the next detection period.
In some embodiments of this embodiment, the length of the self-detection signal is two symbols, and the self-detection signal is identical in two symbols. Therefore, certain fault-tolerant capability is provided, and the requirement on time synchronization when the self-detection signal is received can be effectively reduced.
In some embodiments of this embodiment, the step of collecting the received signal in the digital chip includes:
data of two symbol lengths are collected.
Specifically, because the processing delay of the whole remote radio unit is basically stable, the expected signal can be accurately acquired. And because two symbol data of the self-detection signal are completely consistent, a certain fault-tolerant capability is provided, and the digital chip is further ensured to be capable of acquiring data with a complete symbol length.
In some embodiments of this embodiment, the step of inserting the self-detection signal into a GP time window of a special timeslot in the radio frame structure in the TDD mode includes:
in the radio frame structure of TDD, according to TDD configuration, inserting self-detection signal in GP time window of special time slot.
In particular, the self-detection signal is inserted before digital up-conversion of the downlink. The self-detection signal can set the period T according to actual needs. In one period T, the self-detection signal is applied to the plurality of channels in turn, that is, only one channel is applied by the self-detection signal at a time.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart 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, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions may be stored in a computer-readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to 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), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall 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 attributes 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 (10)

1. A method for self-detecting an uplink of a Remote Radio Unit (RRU) 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, wherein the self-detection signal passes through a multiplexed part of a downlink transmitting link and is coupled into a receiving channel at the input end of an uplink filter through a preset scheme;
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 (double data rate);
and carrying out periodic data analysis on the received signal in the DDR, and detecting a preset key index of an uplink to realize the performance self-check of the uplink of the radio frequency remote unit.
2. The method of claim 1, wherein the step of coupling the self-detection signal into the receiving channel at the input end of the uplink filter by a predetermined scheme via a multiplexed partial downlink transmission link comprises:
the self-detection signal is transmitted through a multiplexing transmitting channel, based on the link budget of an uplink receiving channel, a single-pole double-throw switch is arranged at the output end of a first-stage amplifier of the multiplexing downlink channel and used for switching a self-detection mode and a conventional transmitting mode, wherein the single-pole double-throw switch is controlled by a digital chip and is switched to the self-detection mode in a GP time window and switched to the conventional transmitting mode in other time windows;
when in the self-detection mode, the self-detection signal is coupled from the downlink into the receive path through a microstrip line at the input of the upstream filter.
3. The method of claim 2, wherein the step of coupling the self-detection signal from the downlink to the receive path through a 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 input to each independent receiving channel through the cascaded one-to-two power divider.
4. The method as claimed in claim 2, 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 a GP time window, the self-detection signal is transmitted to the input end of an up filter through digital up-conversion, peak clipping, digital pre-distortion, a digital-to-analog converter and a first-stage power amplifier in sequence;
and the self-detection signal is subjected to analog-to-digital conversion and then is sent to a data acquisition module through digital down-conversion.
5. The method 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 an uplink to implement the performance self-check of the uplink of the radio remote unit comprises:
using formula by digital power meter based on one symbol period
Figure FDA0003540891530000021
Calculating the average power of the self-detection signal to be transmittedUsing the formula
Figure FDA0003540891530000022
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 number of sampling points;
carrying out subtraction operation on the average power of the self-detection signal to be transmitted and 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 greater than a first preset threshold, a link Gain abnormal alarm is sent out, and if the absolute value of the comparison result is less than the first preset threshold, a formula Gain is utilized in combination with link budgetUL＝Powery-(Powerx+GainDL) And calculating the Gain of an uplink, and entering the next detection period, 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.
6. The method according to claim 5, wherein the step of performing periodic data analysis on the received signal in the DDR to detect a preset key indicator of an uplink to implement the performance self-check of the uplink of the remote radio unit comprises:
in the next self-test period, the self-test signal is not sent, and the formula is used by the digital power meter
Figure FDA0003540891530000031
Calculating the background noise Power at no signal input, wherein PowernThe average power of the noise signal is calculated, n is the noise signal, k is the kth sampling point, and M is the total number of sampling points;
using the formula Powern-ARP＝Powern-GainULCalculating to obtain air interface noise, wherein GainULFor uplink gain, PowernFor the mean power of the noise signal, Powern-ARPIs the noise average power of the air interface;
using the formula NFEstimated＝Powern-ARP-Powern-Temp-ARPCalculating to obtain a noise coefficient estimation value, and comparing the noise coefficient estimation value with a second preset threshold to judge whether a noise coefficient index in an uplink is in a normal working state, wherein NF (noise factor) isEstimatedFor estimated noise figure, Powern-ARPPower, noise average POwer over the air interfacen-Temp-ARPWhich is the theoretical noise average power of the air interface.
7. The method 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 an uplink to implement the performance self-check of the uplink of the radio remote unit comprises:
and after the frequency domain processing is carried out on the received signals, the average power of the signals in the whole sampling bandwidth is calculated so as to obtain the interference power statistics of the uplink.
8. The method as claimed in claim 1, wherein the length of the self-detection signal is two symbols, and the self-detection signal is identical on two symbols.
9. The method of claim 8, wherein the step of collecting the received signal in the digital chip comprises:
data of two symbol lengths are collected.
10. The method of claim 1, wherein the step of inserting the self-detection signal into the GP time window of a special timeslot in the radio frame structure in TDD mode comprises:
in the radio frame structure of TDD, according to TDD configuration, inserting self-detection signal in GP time window of special time slot.
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