CN116633465B - Real-time passive intermodulation detection method based on resource block as unit - Google Patents
Real-time passive intermodulation detection method based on resource block as unit Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/345—Interference values
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0203—Power saving arrangements in the radio access network or backbone network of wireless communication networks
- H04W52/0206—Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/12—Wireless traffic scheduling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/085—Access point devices with remote components
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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
Abstract
The invention discloses a real-time passive intermodulation detection method based on a resource block unit, and relates to the technical field of communication base stations. The method comprises the following steps: in a remote radio unit in an FDD mode, periodically performing correlation calculation on an uplink receiving signal of a base station and a downlink reference signal according to a resource block as a unit to obtain a correlation coefficient; the magnitude of the correlation coefficient is used for measuring the magnitude of passive intermodulation interference in the frequency band range corresponding to each resource block in the uplink; after the detection of all uplink resource blocks is completed, a data file containing the passive intermodulation interference detection information of all the resource blocks in the uplink carrier is formed, and the data file is periodically uploaded to a base station scheduling unit; and the base station scheduling unit performs real-time resource block scheduling according to the data information provided by the data file. The invention can effectively ensure the coverage performance of the cell edge and ensure the uplink performance of the base station.
Description
Technical Field
The invention relates to the technical field of communication base stations, in particular to a real-time passive intermodulation detection method based on a resource block as a unit.
Background
With the development of wireless communication, in order to further improve the performance of cell coverage, the transmission power of base stations is continuously increasing, and meanwhile, each base station operates with a multi-carrier configuration also becomes a mainstream trend.
Base station systems based on FDD (Frequency Division Duplexing, frequency division duplex) mode, transmit and receive in different frequency ranges and operate simultaneously, so that there is a possibility that passive intermodulation generated by a transmission frequency band signal falls within the frequency range of a receiver, and thus the performance of a receiving end may be significantly affected. With the increase of the base station transmitting power and the application of multiple carriers, the adverse effect of passive intermodulation on the uplink performance of the base station system based on the FDD mode is more and more serious. How to eliminate passive intermodulation interference in a base station is one of the important research subjects in wireless communication. The detection of the passive intermodulation is one of important preconditions for reducing the influence of the passive intermodulation interference on the uplink performance of the base station.
The traditional passive intermodulation detection scheme is to perform correlation calculation on an uplink carrier and a downlink carrier reference signal based on a complete carrier bandwidth so as to detect the magnitude of a passive intermodulation interference signal in the whole uplink carrier bandwidth range, and then to eliminate the influence of the passive intermodulation interference by adding a passive intermodulation cancellation function (the function module is mainly located in a remote radio unit) in a base station system. In an actual system, network transmission resources are scheduled by taking resource blocks as basic units, and the degrees of influence of passive interference intermodulation on all the resource blocks in an uplink carrier of a base station are different, some of the resource blocks are serious, some of the resource blocks are slightly influenced, and even some of the resource blocks are not influenced by passive intermodulation interference. Therefore, if the base station scheduling system can know the state of each resource block affected by the passive intermodulation interference, when the uplink resource block of the base station is not fully used, the resource block which is less affected by the passive intermodulation or has no passive intermodulation interference can be preferentially used; when the uplink resource block of the base station is fully used, the resource block which is little or no affected by the passive intermodulation interference can be allocated to the cell edge user. Therefore, how to perform passive intermodulation detection more accurately is one of important research directions in industry for reducing the influence of passive intermodulation interference on the uplink performance of a base station at a lower cost.
Disclosure of Invention
The invention aims at: the method for detecting the passive intermodulation based on the resource block as a unit in real time is provided, information that each resource block in an uplink carrier is interfered by the passive intermodulation is obtained in real time, and scheduling of the resource blocks in a network is optimized in real time according to the information, so that the problem of how to reduce the influence of the passive intermodulation on the uplink performance of a base station is solved.
In order to achieve the above purpose, the present invention provides a method for detecting passive intermodulation based on resource block as a unit in real time, which specifically comprises the following steps:
in FDD (Frequency Division Duplexing, frequency division duplex) mode, in the remote radio unit, the base station uplink received signal is periodically calculated by taking a Resource Block (RB) as a unit and is correlated with the downlink passive intermodulation reference signal, so as to detect whether the Resource Block has passive intermodulation interference in real time.
The correlation calculation result is normalized to obtain a correlation coefficient, and the correlation coefficient is used for measuring the magnitude of the passive intermodulation interference, so that the correlation coefficient can be used for quantitatively representing the magnitude of the passive intermodulation (PIM, passive Intermodulation) interference signal existing in the bandwidth range of the uplink resource block.
The correlation coefficients are quantized with 6 bits and the uplink carrier resource block number is represented with 10 bits, which are combined to form 2 bytes of information describing the passive intermodulation state of a single resource block. When the detection of all the resource blocks is completed, a data file with the size of 2 bytes multiplied by the number of the resource blocks is formed. The whole detection process is periodically carried out, and after each period is finished, the formed data file is reported to the base station scheduling unit in real time.
When the base station runs under the condition of not fully loading in the uplink, the base station scheduling unit preferentially uses resource blocks without or with small passive intermodulation interference according to the result of the passive intermodulation real-time detection; when the base station runs in the uplink full load, according to the result of the real-time detection of the passive intermodulation, the resource blocks without or less interfered by the passive intermodulation are preferentially allocated to the users at the edge of the cell, and the resource blocks with more interfered by the passive intermodulation are allocated to the users close to the base station in the cell.
The beneficial effects of the invention are as follows:
the invention relates to a real-time passive intermodulation detection method based on resource blocks, which is characterized in that a base station can obtain information of each resource block interfered by passive intermodulation in an uplink carrier wave in real time, so that the scheduling of the resource blocks in a network is optimized in real time according to the information. Therefore, the performance of cell edge coverage can be effectively ensured, the passive intermodulation cancellation function module can be closed in the remote radio unit (when only the resource block with small influence of passive intermodulation interference is used), and the energy consumption of the remote radio unit and the resource consumption of a digital chip in the remote radio unit can be further reduced.
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For a clearer description of the technical solutions of 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 should not be considered limiting in scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a flow chart of a single detection cycle in the present invention;
FIG. 2 is a diagram of a 2-byte information format;
FIG. 3 is a block diagram of a typical base station remote radio unit;
fig. 4 is a schematic diagram of passive intermodulation under dual carrier configuration of the base station according to the present embodiment;
fig. 5 illustrates the influence of passive intermodulation interference on different resource blocks in the uplink carrier according to this embodiment.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
It should be noted that 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.
Example 1
The invention provides a real-time passive intermodulation detection method based on a resource block unit, as shown in fig. 1.
In the invention, in a remote radio unit, a base station uplink receiving signal is periodically calculated in a correlation manner with a downlink reference signal according to a resource block unit in an FDD (Frequency Division Duplexing) mode to obtain a correlation coefficient.
And measuring the magnitude of the passive intermodulation interference in the frequency band range corresponding to each resource block by utilizing the magnitude of the correlation coefficient. Based on the above information, a 2-byte information is formed by combining the resource block numbers in the uplink carrier of the base station. After the detection of all the uplink resource blocks is completed, a data file is formed, which contains the passive intermodulation interference detection information of all the resource blocks in the uplink carrier. The data file is periodically uploaded to the base station scheduling unit. And when the base station performs resource scheduling, performing real-time scheduling according to the passive interference intermodulation states of all the resource blocks in the uplink carrier wave provided by the data file.
When the base station runs in the uplink under the condition of not being full, preferentially using the resource blocks without or with small passive intermodulation interference;
when the base station runs up to full load, the resource blocks without or with small interference are preferentially distributed to the users at the edge of the cell, and the resource blocks with large interference are distributed to the users close to the base station in the cell.
The specific scheme is as follows:
step 1, obtaining an uplink receiving signal based on a resource block:
wherein ,is the +.>Center frequency of each resource block, < >>Is the +.>Receiving signals by the resource blocks;
step 2, according to the source of the passive intermodulation, calculating the frequency offset value of the received signal to be frequency shifted, taking the third-order intermodulation generated by two downlink carriers as an example, the frequency offset is calculated as follows:
wherein ,for the first downlink carrier center frequency of the base station, is>For the second downlink carrier center frequency of the base station, is>For the base station uplink carrier center frequency, +.>A frequency offset value for frequency shifting the uplink received signal;
step 3, according to the frequency offset value, obtaining the uplink receiving signal based on the resource block after frequency movement:
step 4, calculating the generated passive intermodulation signal according to the downlink carrier signals as a reference signal, wherein taking the three-order passive intermodulation generated by two downlink carriers as an example, the passive intermodulation reference signal is:
wherein ,to represent the square of the first downlink carrier signal,/->To represent the conjugate of the second downstream carrier signal,/->Is a passive intermodulation reference signal;
step 5, converting the received signal of the single resource block in the uplink carrier from the frequency domain to the time domain:
；
step 6, performing correlation calculation on the time domain received signal of a single resource block in the uplink carrier and the passive intermodulation reference signal, judging whether the passive intermodulation interference exists or not through the correlation, and performing correlation calculation as follows:
wherein ,to represent total +.>Calculating by using the sampling points +.>Is representative of->Sampling points->The correlation calculation result is a correlation value;
step 7, normalizing the correlation calculation result by taking the reference signal as a denominator to obtain a correlation coefficient:
wherein ,the larger the correlation coefficient value is, the larger the passive intermodulation interference is.
Step 8, quantizing the correlation coefficient by using 6 bits, identifying the uplink carrier resource block number by using 10 bits to form 2 bytes of information, forming a data file containing the passive intermodulation interference detection information of all the resource blocks in the uplink carrier, wherein the data file is shown in table 1,
table 1, data file format contents
And 9, periodically repeating the steps 1-7 by the remote radio unit, and monitoring the passive intermodulation interference condition of each resource block in the uplink carrier in real time. In each period, after the detection of all the resource blocks in the uplink carrier is completed, 2 bytes of information of all the resource blocks form a data file, and the data file is uploaded to the base station scheduling unit.
Step 10, after receiving the information, the base station scheduling unit allocates the uplink resource blocks according to the passive intermodulation interference condition in the bandwidth of the uplink resource blocks, and the specific allocation method is as follows:
A. when the uplink resource block of the base station is not fully loaded, the resource block without passive intermodulation interference or the resource block with small passive intermodulation interference is preferentially used
B. When the uplink resource block of the base station is fully loaded, the resource blocks which are not interfered by the passive intermodulation or the resource blocks which are less interfered by the passive intermodulation are preferentially allocated to the users at the edge of the cell, and the resource blocks which are more interfered by the passive intermodulation are allocated to the users close to the base station in the cell as much as possible.
The invention is based on the real-time detection method of passive intermodulation of the resource block, thus get the information interfered by passive intermodulation in the bandwidth range of each resource block in the uplink carrier; according to the correlation coefficient of a single uplink resource block and a downlink carrier, establishing passive intermodulation quality mark definition so as to quantitatively describe the passive intermodulation interference condition of all the resource blocks of the uplink carrier; and establishing a 2-byte information field, and forming a data file by the passive intermodulation interference information of all the resource blocks on the basis. The data file is periodically uploaded to a base station dispatching unit, and the auxiliary lacing dispatching unit dispatches resource blocks; after the base station scheduling unit obtains the information file describing the passive intermodulation interference of all the resource blocks of the uplink carrier, scheduling the resource blocks according to the condition that the uplink resource blocks are interfered by the passive intermodulation interference in real time, when the uplink of the base station is not operated under full load, the performance of cell edge coverage can be effectively ensured, meanwhile, the passive intermodulation cancellation function module can be closed in the remote radio unit, and the energy consumption of the remote radio unit is reduced; when the base station runs in an uplink full load, the uplink performance of the base station can be ensured.
Passive intermodulation cancellation function module: when the passive intermodulation interference is detected, the intermodulation interference signal is simulated at the receiving end of the base station, and the simulated intermodulation interference signal is subtracted by the actual receiving signal, so that the elimination of the passive intermodulation interference is realized.
The structure of the remote radio unit of the present invention is shown in fig. 3, and specifically includes:
and a forward interface module: an interface function module of a remote radio unit and a baseband unit in a base station;
an inverse fourier transform module: converting the frequency domain signal transmitted by the baseband into a time domain signal;
digital up-conversion module: the received baseband signal is used for increasing the signal sampling rate in an interpolation mode and obtaining expected performance;
peak clipping module: reducing the peak-to-average ratio of the signal;
digital predistortion module: the module is used for improving the nonlinearity of the power amplifier, and generating a predistortion signal according to a feedback signal of a transmitting feedback channel and overlapping the predistortion signal on a forward input signal so as to achieve the purpose of compensating the distortion of the power amplifier;
DAC module: digital-to-analog conversion, which is responsible for converting digital signals into analog signals;
and a power amplification module: a power amplifier responsible for amplifying the signal to a desired power level;
a filter module: responsible for reducing the parts of the whole frequency band other than the useful signal;
on-board power divider module: is responsible for synthesizing and transmitting the multipath signals;
an antenna module: the radio frequency signals responsible for seeing the base station are sent to the free space, and meanwhile, signals are received in the free space;
and a low noise amplifier module: a low noise amplifier;
ADC module: analog-to-digital conversion, which is responsible for converting an analog signal into a digital signal;
PIMC module: a passive intermodulation cancellation module;
digital down conversion module: reducing the signal sampling rate of the sampled signal in a decimating manner and obtaining the expected performance;
and a Fourier transform module: and converting the time domain signal received by the remote radio unit into a frequency domain signal.
Taking base station dual carrier of band 2 (3 GPP definition) as an example, the passive intermodulation is shown in fig. 4, where:
b2:3GPP defines band 2 where the base station downlink frequency range is 1930MHz-1990MHz and the base station uplink frequency range is 1850MHz-1910MHz;
DL: the base station descends;
UL: a base station is uplink;
the base station downlink is configured into dual carriers, which are respectively T1 and T2;
the base station uplink is configured as dual carriers, which are R1 and R2 respectively.
The influence of passive intermodulation interference on different resource blocks in the uplink carrier is shown in fig. 5.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not creatively contemplated by those skilled in the art within the technical scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.
Claims (5)
1. A real-time passive intermodulation detection method based on a resource block as a unit is characterized by comprising the following steps:
in a remote radio unit in an FDD mode, periodically performing correlation calculation on an uplink receiving signal of a base station and a downlink reference signal according to a resource block as a unit to obtain a correlation coefficient;
the magnitude of the correlation coefficient is used for measuring the magnitude of passive intermodulation interference in the frequency band range corresponding to each resource block in the uplink;
after the detection of all uplink resource blocks is completed, a data file containing the passive intermodulation interference detection information of all the resource blocks in the uplink carrier is formed, and the data file is periodically uploaded to a base station scheduling unit;
when the base station runs in the uplink under the condition of not being full, preferentially using the resource blocks without or with small passive intermodulation interference;
when the base station runs up to full load, the resource blocks without or with small interference are preferentially distributed to the users at the edge of the cell, and the resource blocks with large interference are distributed to the users close to the base station in the cell.
2. The method for detecting passive intermodulation based on resource block as unit according to claim 1, wherein the step of periodically performing correlation calculation on the base station uplink received signal and the downlink reference signal according to the resource block as unit to obtain a correlation coefficient comprises the following specific steps:
obtaining an uplink received signal based on a resource block:
wherein ,is the +.>Center frequency of each resource block, < >>Is the +.>Receiving signals by the resource blocks;
according to the source of the passive intermodulation, the frequency offset value of the received signal to be subjected to frequency shifting is calculated, and the frequency offset value of the third-order intermodulation generated by two downlink carriers is calculated as follows:
wherein ,for the first downlink carrier center frequency of the base station, is>Is the base stationTwo downlink carrier center frequencies, +.>For the base station uplink carrier center frequency, +.>A frequency offset value for frequency shifting the uplink received signal;
according to the frequency offset value, obtaining an uplink received signal based on the resource block after frequency shifting:
the passive intermodulation signal generated by calculation according to the downlink carrier signals is used as a reference signal, wherein the third-order passive intermodulation reference signal generated by two downlink carriers is:
wherein ,to represent the square of the first downlink carrier signal,/->To represent the conjugate of the second downstream carrier signal,/->Is a passive intermodulation reference signal;
converting the received signal of a single resource block in the uplink carrier from a frequency domain to a time domain:
；
performing correlation calculation on a time domain received signal of a single resource block in an uplink carrier and a passive intermodulation reference signal, judging whether passive intermodulation interference exists or not through correlation, and performing correlation calculation as follows:
wherein ,to represent total +.>Calculating by using the sampling points +.>Is representative of->Sampling points->The correlation calculation result is a correlation value;
normalizing the correlation calculation result by taking the reference signal as a denominator to obtain a correlation coefficient:
wherein ,the larger the correlation coefficient value is, the larger the passive intermodulation interference is.
3. The method for detecting passive intermodulation based on resource block units in real time according to claim 2, wherein the method comprises the steps of: and the data file stores the passive intermodulation interference detection information of the corresponding resource block in the uplink carrier according to the resource block number, and describes the passive intermodulation state of a single resource block through one piece of 2-byte information.
4. A method for real-time passive intermodulation detection based on resource block units according to claim 3, wherein: the 2 bytes of information include correlation coefficients quantized with 6 bits and resource block numbers identifying the uplink carrier with 10 bits.
5. The method for detecting passive intermodulation based on resource block units in real time according to claim 1, wherein the method comprises the steps of: and the passive intermodulation detection process is periodically carried out, and the formed data file is reported to the base station dispatching unit in real time after each detection period is finished.
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