CN115378478A - Channel calibration method, device, base station and storage medium - Google Patents
Channel calibration method, device, base station and storage medium Download PDFInfo
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Abstract
The application discloses a base station calibration method, a base station calibration device, a base station, a control node and a storage medium, wherein for each base station of two base stations for performing inter-base-station calibration, the method comprises the following steps: a first base station sends a first type of reference signal to a second base station; the first base station sends a second type of reference signal to the second base station; the first type of reference signals sent by the first base station are used for the second base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a channel calibration method, an apparatus, a base station, and a storage medium.
Background
In the inter-base-station communication process, in order to better ensure the reciprocity of the uplink channel and the downlink channel, the inter-base-station calibration is required. In the related art, the calibration is mainly performed between the base stations through a single antenna, as shown in fig. 1, such an inter-base-station calibration method has a wide beam, weak calibration signal directivity, and limited calibration accuracy.
Disclosure of Invention
In order to solve related technical problems, embodiments of the present application provide a method and an apparatus for calibrating a base station, a control node, and a storage medium.
The technical scheme of the embodiment of the application is realized as follows:
the embodiment of the application provides a base station calibration method, which comprises the following steps:
a first base station sends a first type of reference signal to a second base station;
the first base station sends a second type of reference signal to the second base station; wherein the content of the first and second substances,
the first type of reference signals sent by the first base station are used for the second base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
In the above scheme, the method further includes:
the first base station receives a first type of reference signal sent by the second base station;
and based on the received first type of reference signals sent by the second base station, the first base station acquires a first receiving matrix and a first initial precoding matrix.
In the above scheme, the obtaining, by the first base station, a first receiving matrix and a first initial precoding matrix based on the received first type of reference signal sent by the second base station includes:
based on the received first type of reference signals sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;
and the first base station corrects the calculated second receiving matrix and the second initial precoding matrix to obtain a first receiving matrix and a first initial precoding matrix.
In the foregoing solution, the method further includes:
and the first base station reports the first receiving matrix and the first initial precoding matrix to a control node.
In the above scheme, the obtaining, by the first base station, a first receiving matrix and a first initial precoding matrix based on the received first type of reference signal sent by the second base station includes:
based on the received first type of reference signals sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;
the first base station reports the calculated second receiving matrix and the second initial precoding matrix to a control node;
the first base station receives a first receiving matrix and a first initial precoding matrix issued by the control node; wherein the content of the first and second substances,
and the control node corrects a second receiving matrix and a second initial precoding matrix reported by the first base station to obtain the first receiving matrix and the first initial precoding matrix.
In the above scheme, the sending, by the first base station, the second type of reference signal to the second base station includes:
and the first base station sends the precoded second-class reference signals to the second base station.
In the above scheme, the method further comprises:
the first base station receives a second type of reference signal sent by the second base station;
the first base station reports a received signal of a second type of reference signal sent by the second base station to a control node; wherein, the first and the second end of the pipe are connected with each other,
the received signal is determined based on a first receive matrix and a first initial precoding matrix of the first base station.
In the above scheme, the method further comprises:
and the first base station transmits the first type of reference signals and/or the second type of reference signals through a plurality of antennas.
In the above scheme, the second base station is a reference base station; the method further comprises the following steps:
the first base station receives a calibration coefficient issued by a control node; wherein the content of the first and second substances,
the calibration coefficient can be obtained by performing weighted average calculation on the calibration coefficients at different moments by the control node.
The embodiment of the application also provides a base station calibration method, which is applied to a control node, and the method comprises the following steps:
determining a calibration coefficient between two base stations based on a received signal, a second-class reference signal, a receiving matrix and an initial precoding matrix of each of the two base stations; wherein the content of the first and second substances,
in the two base stations, a first receiving signal of a first base station represents a receiving signal of a second type of reference signal transmitted by the second base station, and the first receiving signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station; the first receiving matrix and the first initial precoding matrix are determined based on a first type of reference signals sent by the second base station; the first type of reference signals are used for a base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
In the above scheme, the calibration coefficient may be obtained by performing weighted average calculation on the calibration coefficients at different times by the control node.
In the above scheme, the method further comprises:
and receiving a receiving matrix and a precoding matrix uploaded by each of the two base stations.
In the foregoing solution, the method further includes:
correcting a receiving matrix and a pre-coding matrix uploaded by a base station;
and issuing the corrected receiving matrix and the corrected precoding matrix to the corresponding base station.
The embodiment of the present application further provides a base station calibration apparatus, including:
a first transmitting unit, configured to transmit a first type of reference signal to a second base station;
a second sending unit, configured to send a second type of reference signal to the second base station; wherein the content of the first and second substances,
the transmitted first type of reference signals are used for the second base station to acquire a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
The embodiment of the present application further provides a base station calibration apparatus, including:
a determining unit, configured to determine a calibration coefficient between two base stations based on a received signal, a second-class reference signal, a received matrix, and an initial precoding matrix of each of the two base stations; wherein the content of the first and second substances,
in the two base stations, a first received signal of a first base station represents a received signal related to a second type of reference signal sent by the second base station, and the first received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station; the first receiving matrix and the first initial precoding matrix are determined based on the first type of reference signals sent by the second base station; the first type of reference signals are used for a base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
The embodiment of the present application further provides a first base station, including: a first processor and a first communication interface; wherein the content of the first and second substances,
the first communication interface is used for sending a first type of reference signal to a second base station; and for transmitting reference signals of a second type to the second base station; wherein the content of the first and second substances,
the first type of reference signals sent by the first base station are used for the second base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
An embodiment of the present application further provides a control node, including: a second processor and a second communication interface; wherein, the first and the second end of the pipe are connected with each other,
the second processor is configured to determine a calibration coefficient between two base stations based on a received signal of each of the two base stations, a second-class reference signal, a received matrix, and an initial precoding matrix; wherein the content of the first and second substances,
in the two base stations, a first receiving signal of a first base station represents a receiving signal of a second type of reference signal transmitted by the second base station, and the first receiving signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station; the first receiving matrix and the first initial precoding matrix are determined based on a first type of reference signals sent by the second base station; the first type of reference signals are used for a base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
An embodiment of the present application further provides a base station, including: a first processor and a first memory for storing a computer program capable of running on the processor,
wherein the first processor is configured to execute the steps of the calibration method for any base station at the base station side when the computer program is run.
An embodiment of the present application further provides a control node, including: a second processor and a second memory for storing a computer program capable of running on the processor,
the second processor is configured to execute the steps of the method for calibrating any base station on the control node side when the computer program is run.
The embodiment of the present application further provides a storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of the above-mentioned method for calibrating the first base station on the base station side; or implementing the steps of the method for calibrating any base station at the control node side.
In the base station calibration method, apparatus, base station, control node, and storage medium provided in the embodiments of the present application, for two base stations performing inter-base station calibration, each base station (first base station) sends a first type of reference signal and a calibration signal to another base station (second base station), and each base station acquires a reception matrix and an initial precoding matrix according to the received first type of reference signal sent by the another base station. On the basis that each base station transmits the two types of reference signals, calibration between the base stations can be completed based on beams with stronger directivity, and therefore high-precision calibration is achieved.
Drawings
FIG. 1 is a diagram illustrating a related art base station calibration;
fig. 2 is a schematic flowchart of a base station calibration method according to an embodiment of the present application;
FIG. 3 is a flowchart illustrating another base station calibration method according to an embodiment of the present application
FIG. 4 is a diagram illustrating base station calibration according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a base station calibration apparatus according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of another base station calibration apparatus according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a first base station according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a control node according to an embodiment of the present application.
Detailed Description
Distributed ultra-large scale Multiple Input Multiple Output (MIMO) is oriented to the sixth generation mobile communication technology (6G, 6) th Generation) is a solution to the need for higher capacity communications. Through coherent/non-coherent transmission of a plurality of base stations, the distributed ultra-large scale MIMO can eliminate interference and improve user experience on the one hand, and can improve the overall capacity on the other hand, thereby having good application prospect in a high-capacity scene. In a distributed very large scale MIMO system, a base station needs to preprocess user data based on downlink channel information. For a Time-Division Duplex (TDD) system, since the transmission and the reception share one propagation channel, the transmission and the reception frequencies are the same, so that the uplink propagation channel can be theoretically considered to be equal to the downlink propagation channel, in other words, the uplink propagation channel is considered to be equal to the downlink propagation channelThe downlink channel and the downlink channel have reciprocity. However, in practical application, two sets of circuits are required for the rf end of the antenna to respectively complete signal transmission and reception, and the two sets of circuits at the rf end have the same characteristics due to the process error of hardware and the nonlinear distortion of the amplifier, so that reciprocity of the uplink channel and the downlink channel is damaged in the TDD system. In addition, the characteristic response of each rf circuit also changes with the change of environmental factors such as temperature and humidity and time, and from the viewpoint of the influence on the baseband signal, the transmit channel and the receive channel multiply respective signals by different coefficients equivalently, which also leads to the impairment of reciprocity of the uplink channel and the downlink channel.
In order to achieve reciprocity between the uplink and downlink channels, calibration of the radio frequency link is required. In the related art, a distributed super-large-scale MIMO system is mainly calibrated by a hardware calibration method and an air interface calibration method. In the hardware calibration method, calibration ports of a plurality of base stations are connected by cables, and calibration is performed on the basis of the connection ports. For a MIMO system with a large number of distributed nodes, the requirement of a hardware calibration method on cables is high, and large-scale deployment is limited. The air interface calibration method can realize the calibration of the transmitting and receiving channels among the plurality of distributed base stations through user feedback information or the transmitting and receiving calibration signals of the base station. However, referring to fig. 1, the above channel calibration process is mainly performed by a single antenna, the beam is wide, and the calibration signal directivity is not strong, so that the calibration accuracy is limited, and it is difficult to meet the requirement of the distributed super-large-scale MIMO system on the calibration accuracy.
Based on this, embodiments of the present application provide a base station calibration method, apparatus, base station, control node, and storage medium, where for two base stations performing inter-base station calibration, one of the base stations (a first base station) sends a first type of reference signal of the first base station to the other base station (a second base station), and each base station obtains a receiving matrix and an initial precoding matrix according to the received first type of reference signal sent by an opposite base station. And based on the receiving matrix and the initial precoding matrix of the first base station, the first base station sends a second type of reference signals of the first base station to the second base station, wherein the second type of reference signals are calibration signals.
The present application will be described in further detail with reference to the drawings and examples.
The embodiment of the present application provides a method for calibrating a base station, which is applied to each of two base stations performing inter-base station calibration, that is, in an inter-base station calibration process, each of the two base stations needs to perform the steps in the following method. Here, two base stations for performing inter-base station calibration are distinguished by "a first base station" and "a second base station", and it should be noted that: "first base station" and "second base station" are used only to distinguish two different base stations in describing embodiments, and are not used to describe a particular function, order, or sequence.
As shown in fig. 2, the method includes:
step 201: the first base station transmits a first type of reference signal to the second base station.
The first type of reference signals sent by the first base station are used for the second base station to acquire a receiving matrix and an initial precoding matrix.
In an embodiment, the method further comprises:
the first base station receives a first type of reference signal sent by the second base station;
and based on the received first type of reference signals sent by the second base station, the first base station acquires a first receiving matrix and a first initial precoding matrix.
It is assumed herein that two base stations performing inter-base station calibration are respectively BS i And BS j In practical application, the base station BS i To the base station BS j Transmitting base station BS i Of the first type, base station BS j To the base station BS i Transmitting base station BS j Reference signal of the first type. Base station BS i By receiving the base station BS j Obtaining a channel matrix from the first type of reference signal and further obtaining a receiving matrix U i And an initial precoding matrix V i Likewise, the base station BS j By receiving the base station BS i Obtain a channel matrix from the first type of reference signal, andto obtain a receiving matrix U j And an initial precoding matrix V j 。
Here, two base stations performing inter-base-station calibration respectively obtain their respective reception matrices and initial precoding matrices by transmitting first-type reference signals to each other, and use the obtained reception matrices and initial precoding matrices for transmission and reception of second-type reference signals (calibration signals). In practical application, the receiving matrix and the initial precoding matrix obtained by performing initial calculation on the received first-class reference signal need to be corrected, so that the receiving matrix and the initial precoding matrix which are really used for calibrating signal receiving and transmitting can be determined. Based on this, in an embodiment, the acquiring, by the first base station, a first receiving matrix and a first initial precoding matrix based on the received first type of reference signals sent by the second base station includes:
based on the received first type of reference signals sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;
and the first base station corrects the calculated second receiving matrix and the second initial precoding matrix to obtain a first receiving matrix and a first initial precoding matrix.
In an embodiment, the method further comprises:
and the first base station reports the first receiving matrix and the first initial precoding matrix to a control node.
Here, the base station performs correction of the reception matrix and the initial precoding matrix to determine the reception matrix and the initial precoding matrix for calibration in signal transmission and reception.
In practical application, when the base station completes the correction of the receiving matrix and the initial precoding matrix, the base station needs to report the corrected receiving matrix and the corrected initial precoding matrix to the control node, so that the control node can complete the calculation of the calibration coefficient based on the receiving matrix and the initial precoding matrix of each base station subsequently.
In an embodiment, the obtaining, by the first base station, a first receiving matrix and a first initial precoding matrix based on the received first type of reference signals sent by the second base station includes:
based on the received first type of reference signals sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;
the first base station reports the calculated second receiving matrix and the second initial precoding matrix to a control node;
the first base station receives a first receiving matrix and a first initial precoding matrix issued by the control node; wherein the content of the first and second substances,
and the control node corrects a second receiving matrix and a second initial precoding matrix reported by the first base station to obtain the first receiving matrix and the first initial precoding matrix.
Here, the base station may also select to report a receiving matrix and an initial precoding matrix obtained by initial calculation according to the received first-class reference signal to the control node, the control node completes the correction of the receiving matrix and the initial precoding matrix, and after the correction is completed, the corrected receiving matrix and the initial precoding matrix are issued to the corresponding base station for the transceiving of the calibration signal.
Step 202: and the first base station sends the second type of reference signals to the second base station.
Wherein the second type of reference signal is characterized as a calibration signal.
In an embodiment, the method further comprises:
the first base station receives a second type of reference signal sent by the second base station;
and the first base station reports a received signal of the second type of reference signal sent by the second base station to a control node.
Wherein the received signal is determined based on a first receive matrix and a first initial precoding matrix of the first base station.
In practical application, the base station BS i To the base station BS j Transmitting base station BS i Base station BS j To the base station BS i SendingBase station BS j Reference signals of the second type. Base station BS i Will relate to the base station BS j Of the second type of reference signal Y i Reporting to the control node, and likewise, the base station BS j Will relate to the base station BS i Of the first type of reference signal Y j And reporting to the control node, so that the control node performs inter-base station calibration according to the received signals reported by the two base stations, and determines a corresponding calibration coefficient.
Here, the received signal is determined based on a first reception matrix of the first base station and a first initial precoding matrix. In particular, the base station BS j To base station BS i Received signal Y of the second type of reference signal j Can be expressed as
That is to say
Wherein, U j Is a base station BS j Of the receiving matrix R j As a base station BS j The diagonal of (a) receive the mismatch matrix,
T i is a base station BS i The diagonal of (a) transmits a mismatch matrix,
H ji is a practical channel matrix (satisfying reciprocity between uplink and downlink), V i In order to be a pre-coding matrix,
S i is a base station BS i Transmitted reference signals of the second type (calibration signals), N j In the form of a noise matrix, the noise matrix,
accordingly, the base station BS i To base station BS j Received signal Y of the second type of reference signal i Can be expressed as
That is to say
Wherein, U i Is a base station BS i Of the receiving matrix R i As a base station BS i The diagonal of (a) receive the mismatch matrix,
T j is a base station BS j The diagonal of (a) transmits a mismatch matrix,
H ji is a practical channel matrix (satisfying reciprocity between uplink and downlink), V j In order to be a pre-coding matrix,
S j is a base station BS j Transmitted reference signals of the second type (calibration signals), N i In the form of a noise matrix, the noise matrix,
therefore, the received signals reported by the first base station to the control node carry the relevant information of the first receiving matrix and the first initial precoding matrix, and the control node subsequently determines the calibration coefficient according to the received signals reported by each base station, the second-class reference signals, the receiving matrix and the initial precoding matrix, so that the calibration among the base stations can be completed based on the beams with stronger directivity, and high-precision calibration is realized.
In an embodiment, the method further comprises:
and the first base station transmits the first type of reference signals and/or the second type of reference signals through a plurality of antennas.
Since the calibration signal transmitted by each base station is a single-stream signal, the second-type reference signal needs to be precoded before being transmitted, and then transmitted after being formed into a wave.
Therefore, in an embodiment, the first base station transmits a second type of reference signal to the second base station, including:
and the first base station sends the precoded second-class reference signals to the second base station.
In practical application, the second base station is used as a reference base station, and the first base station needs to be calibrated, at this time, the method further includes:
the first base station receives a calibration coefficient issued by a control node; wherein the content of the first and second substances,
the calibration coefficient can be obtained by performing weighted average calculation on the calibration coefficients at different moments by the control node.
Fig. 3 shows a flow of implementing a base station calibration method provided in another embodiment of the present application, applied to a control node, and referring to fig. 3, the method includes:
step 301: and determining a calibration coefficient between the two base stations based on the received signal, the second-class reference signal, the receiving matrix and the initial precoding matrix of each of the two base stations.
Wherein, in the two base stations, a first received signal of a first base station represents a received signal related to a second type of reference signal transmitted by the second base station, and the first received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station; the first receiving matrix and the first initial precoding matrix are determined based on the first type of reference signals sent by the second base station; the first type of reference signals are used for a base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
In an embodiment, the method further comprises:
and receiving a receiving matrix and a precoding matrix uploaded by each of the two base stations.
In an embodiment, the method further comprises:
correcting a receiving matrix and a pre-coding matrix uploaded by a base station;
and issuing the corrected receiving matrix and the corrected precoding matrix to the corresponding base station.
In practical application, the base station may complete the correction of the receiving matrix and the initial precoding matrix to determine the receiving matrix and the initial precoding matrix for calibrating signal transceiving. When the base station completes the correction of the receiving matrix and the initial precoding matrix, the base station needs to report the corrected receiving matrix and the initial precoding matrix to the control node, so that the control node can complete the calculation of the calibration coefficient based on the receiving matrix and the initial precoding matrix of each base station subsequently.
Or, in practical application, the base station may also select to report the receiving matrix and the initial precoding matrix obtained by initial calculation according to the received first-type reference signal to the control node, the control node completes the correction of the receiving matrix and the initial precoding matrix, and after the correction is completed, the corrected receiving matrix and the corrected initial precoding matrix are issued to the corresponding base station for the transceiving of the calibration signal.
Here, the control node is a network entity, and after acquiring respective receiving signals, calibration signals, receiving matrices and initial precoding matrices of the two base stations, the control node performs channel estimation through the receiving signals and the calibration signals to obtain second channel matrices corresponding to the two base stations respectively
And
in case of neglecting noise, there are:
in practical application, the base station BS j And base station BS i There is T due to mismatch of receiving and transmitting channels i ≠R i ，T j ≠R j And T is i ≠T j ，R i ≠R j In the case of (c). Assuming that the channel within a single base station has completed calibration, T i And R i The ratio of diagonal elements is a i ，T j And R j The ratio of diagonal elements is b j ，a i And b j Are complex numbers that contain both amplitude and phase. Based on this, the following relationship exists between the respective transmit-receive mismatch matrixes of the two base stations:
T i (R i ) -1 ＝c ji (T j (R j ) -1 )
namely a i ＝c ji b j Wherein c is ji For the calibration coefficient to be found, c ji The complex number includes the amplitude difference and the phase difference between the transceiving channels of the two base stations.
Suppose U i ＝V i ，U j ＝V j Since the calibration signal is a single-stream signal, an
Then the calibration coefficients are calculated as follows:
that is, the calibration coefficients
In an embodiment, the calibration coefficients may be calculated by weighted averaging the calibration coefficients at different times by the control node.
Here, the calibration coefficients at different times are weighted-averaged based on the time domain, i.e. obtained at K timesDifferent calibration coefficients c ji (k) Then performing weighted average
Wherein, beta k Is the weighting factor at the kth time instant.
Thus, the control node will c ji Sending to the base station needing calibration in two base stations, and multiplying the base station by c on each transmission channel ji The calibration may be completed.
In the base station calibration method provided in the embodiment of the present application, for two base stations performing inter-base station calibration, each base station sends a first type of reference signal and a calibration signal to another base station, and each base station acquires a receiving matrix and an initial precoding matrix according to the received first type of reference signal sent by another base station. On the basis that each base station transmits the two types of reference signals, calibration between the base stations can be completed based on beams with stronger directivity, and therefore high-precision calibration is achieved. Under the application scenario of the distributed super-large-scale MIMO system, the base station calibration method can make full use of the system characteristics of the distributed super-large-scale MIMO, and as shown in FIG. 4, beams with strong directivity are formed among the base stations, so that calibration with higher precision is realized, and the capacity of the distributed super-large-scale MIMO system is effectively improved.
In order to implement the method at the base station side in the embodiment of the present application, an embodiment of the present application further provides a base station calibration apparatus, which is disposed on each of two base stations for performing inter-base station calibration, and as shown in fig. 5, the apparatus includes:
a first sending unit 501, configured to send a first type of reference signal to a second base station;
a second sending unit 502, configured to send a second type of reference signal to the second base station.
The transmitted first type of reference signals are used for the second base station to acquire a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
In one embodiment, the apparatus further comprises:
a first receiving unit, configured to receive a first type of reference signal sent by the second base station;
a first obtaining unit, configured to obtain a first receiving matrix and a first initial precoding matrix based on the received first type of reference signal sent by the second base station.
In an embodiment, the first obtaining unit is configured to:
calculating a second receiving matrix and a second initial precoding matrix based on the received first type of reference signals sent by the second base station;
and correcting the calculated second receiving matrix and the second initial precoding matrix to obtain a first receiving matrix and a first initial precoding matrix.
In one embodiment, the apparatus further comprises:
a first reporting unit, configured to report the first receiving matrix and the first initial precoding matrix to the control node.
In an embodiment, the first obtaining unit is configured to:
calculating a second receiving matrix and a second initial precoding matrix based on the received first type of reference signals sent by the second base station;
reporting the calculated second receiving matrix and the second initial pre-coding matrix to a control node;
and receiving a first receiving matrix and a first initial precoding matrix issued by the control node.
And the control node corrects a second receiving matrix and a second initial precoding matrix reported by the first base station to obtain the first receiving matrix and the first initial precoding matrix.
In an embodiment, the second sending unit 502 is configured to:
and sending the second type of reference signals after precoding processing to the second base station.
In one embodiment, the apparatus further comprises:
a second receiving unit, configured to receive a second type of reference signal sent by the second base station;
a second reporting unit, configured to report a received signal of the second type of reference signal sent by the second base station to a control node.
Wherein the received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station.
In an embodiment, the first sending unit 501 sends the first type of reference signals through multiple antennas and/or the second sending unit 502 sends the second type of reference signals through multiple antennas.
In an embodiment, the second base station is a reference base station; the device further comprises:
and the third receiving unit is used for receiving the calibration coefficient issued by the control node.
The calibration coefficient can be obtained by performing weighted average calculation on the calibration coefficients at different moments by the control node.
In practical application, the first sending unit 501, the second sending unit 502, the first receiving unit, the first reporting unit, the second receiving unit, and the second reporting unit may be implemented by a communication interface in a base station calibration apparatus; the first obtaining unit may be implemented by a processor in the base station calibration apparatus in combination with the communication interface.
In order to implement the method for controlling the node side in the embodiment of the present application, an embodiment of the present application further provides a base station calibration apparatus, which is disposed on the control node, and as shown in fig. 6, the apparatus includes:
a determining unit 601, configured to determine a calibration coefficient between two base stations based on a received signal of each of the two base stations, the second-class reference signal, the receiving matrix, and the initial precoding matrix.
Wherein, in the two base stations, a first received signal of a first base station represents a received signal related to a second type of reference signal transmitted by the second base station, and the first received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station; the first receiving matrix and the first initial precoding matrix are determined based on a first type of reference signals sent by the second base station; the first type of reference signals are used for a base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
In an embodiment, the calibration coefficients may be calculated by weighted averaging the calibration coefficients at different times by the control node.
In one embodiment, the apparatus further comprises:
and the third receiving unit is used for receiving the receiving matrix and the precoding matrix uploaded by each of the two base stations.
In one embodiment, the apparatus further comprises:
the correction unit is used for correcting the receiving matrix and the precoding matrix uploaded by the base station;
and the issuing unit is used for issuing the corrected receiving matrix and the corrected precoding matrix to the corresponding base station.
In practical application, the determining unit 601 and the correcting unit may be implemented by a processor in the base station calibration apparatus; the third receiving unit and the sending unit can be realized by a communication interface in the base station calibration device.
It should be noted that: in the I-base station calibration apparatus provided in the foregoing embodiment, when performing base station calibration, only the division of the program modules is illustrated, and in practical applications, the above processing allocation may be completed by different program modules according to needs, that is, the internal structure of the apparatus is divided into different program modules to complete all or part of the above-described processing. In addition, the embodiments of the base station calibration apparatus and the base station calibration method provided in the above embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments and are not described herein again.
Based on the hardware implementation of the program module, and in order to implement the method at the base station side in the embodiment of the present application, an embodiment of the present application further provides a first base station, and as shown in fig. 7, the first base station 700 includes:
a first communication interface 701, which is capable of performing information interaction with other network nodes;
the first processor 702 is connected to the first communication interface 701 to implement information interaction with other network nodes, and is configured to execute the method provided by one or more technical solutions of the first base station side when running a computer program. And the computer program is stored on the first memory 703.
Specifically, the first communication interface 701 is configured to send a first type of reference signal to a second base station; and for transmitting reference signals of a second type to the second base station.
The first type of reference signals sent by the first base station are used for the second base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
In an embodiment, the first communication interface 701 is further configured to:
the first base station receives a first type of reference signal sent by the second base station;
the first processor 702 is configured to obtain a first receiving matrix and a first initial precoding matrix based on the received first type of reference signals sent by the second base station.
In one embodiment, the first processor 702 is configured to:
calculating a second receiving matrix and a second initial precoding matrix based on the received first type of reference signals sent by the second base station; and correcting the calculated second receiving matrix and the second initial precoding matrix to obtain a first receiving matrix and a first initial precoding matrix.
In an embodiment, the first communication interface 701 is further configured to:
and reporting the first receiving matrix and the first initial precoding matrix to a control node.
In one embodiment, the first processor 702 is configured to:
calculating a second receiving matrix and a second initial precoding matrix based on the received first type of reference signals sent by the second base station; reporting the calculated second receiving matrix and the second initial precoding matrix to a control node; and receiving a first receiving matrix and a first initial precoding matrix issued by the control node.
And the control node corrects a second receiving matrix and a second initial precoding matrix reported by the first base station to obtain the first receiving matrix and the first initial precoding matrix.
In one embodiment, the first communication interface 701 is configured to:
and sending the second type of reference signals after precoding processing to the second base station.
In an embodiment, the first communication interface 701 is further configured to:
receiving a second type of reference signal sent by the second base station; and reporting a received signal of the second type of reference signal transmitted by the second base station to a control node.
Wherein the received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station.
In an embodiment, the first communication interface 701 is further configured to:
and transmitting the first type of reference signals and/or the second type of reference signals through a plurality of antennas.
In an embodiment, the second base station is a reference base station; the first communication interface 701 is further configured to:
and receiving the calibration coefficient issued by the control node.
The calibration coefficient can be obtained by performing weighted average calculation on the calibration coefficients at different moments by the control node.
It should be noted that: the specific processing procedures of the first processor 702 and the first communication interface 701 can be understood with reference to the base station calibration method on the base station side described above.
Of course, in practice, the various components in the first base station 700 are coupled together by a bus system 704. It is understood that the bus system 704 is used to enable communications among the components. The bus system 1204 includes a power bus, a control bus, and a status signal bus, in addition to a data bus. For clarity of illustration, however, the various buses are labeled in fig. 7 as the bus system 704.
The first memory 703 in the embodiment of the present application is used to store various types of data to support the operation of the first base station 700. Examples of such data include: any computer program for operating on the first base station 700.
The method disclosed in the embodiments of the present application can be applied to the first processor 702, or implemented by the first processor 702. The first processor 702 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the first processor 702. The first Processor 702 may be a general purpose Processor, a Digital Signal Processor (DSP), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, etc. The first processor 702 may implement or perform the methods, steps and logic blocks disclosed in the embodiments of the present application. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium located in the first memory 703, and the first processor 702 reads the information in the first memory 703 and completes the steps of the foregoing method in combination with its hardware.
In an exemplary embodiment, the first base station 700 may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, programmable Logic Devices (PLDs), complex Programmable Logic Devices (CPLDs), field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro Controllers (MCUs), microprocessors (microprocessors), or other electronic components for performing the aforementioned methods.
Based on the hardware implementation of the program module, and in order to implement the method for controlling the node side according to the embodiment of the present application, an embodiment of the present application further provides a control node, and as shown in fig. 8, the control node 800 includes:
the second communication interface 801 is capable of performing information interaction with other network nodes;
the second processor 802 is connected to the second communication interface 801 to implement information interaction with other network nodes, and is configured to execute a method provided by one or more technical solutions of the control node side when running a computer program. And the computer program is stored on the second memory 803.
Specifically, the second processor 802 is configured to:
and determining a calibration coefficient between the two base stations based on the received signal, the second-class reference signal, the receiving matrix and the initial precoding matrix of each of the two base stations.
Wherein, in the two base stations, a first received signal of a first base station represents a received signal of a second type of reference signal related to the second base station, and the first received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station; the first receiving matrix and the first initial precoding matrix are determined based on a first type of reference signals of a second base station received by a first base station; the first type of reference signals are used for a base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
In an embodiment, the calibration coefficients may be calculated by weighted averaging the calibration coefficients at different times by the control node.
In one embodiment, the second communication interface 801 is configured to:
and receiving a receiving matrix and a precoding matrix uploaded by each of the two base stations.
In an embodiment, the second processor 802 is further configured to modify a receiving matrix and a precoding matrix uploaded by a base station;
the second communication interface 801 is further configured to issue the modified receiving matrix and the modified precoding matrix to the corresponding base station.
It should be noted that: the specific processing of the second processor 802 and the second communication interface 801 may be understood with reference to the methods described above.
Of course, in practice, the various components in the control node 800 are coupled together by a bus system 804. It is understood that the bus system 804 is used to enable communications among the components. The bus system 804 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 804 in FIG. 8.
The second memory 803 in the embodiment of the present application is used to store various types of data to support the operation of the control node 800. Examples of such data include: any computer program for operating on the control node 800.
The method disclosed in the embodiment of the present application can be applied to the second processor 802, or implemented by the second processor 802. The second processor 802 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by an integrated logic circuit of hardware or an instruction in the form of software in the second processor 802. The second processor 802 described above may be a general purpose processor, a DSP, or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The second processor 802 may implement or perform the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium located in the second memory 803, and the second processor 802 reads the information in the second memory 803, and completes the steps of the foregoing method in conjunction with its hardware.
In an exemplary embodiment, the control node 800 may be implemented by one or more ASICs, DSPs, PLDs, CPLDs, FPGAs, general-purpose processors, controllers, MCUs, microprocessors, or other electronic components for performing the aforementioned methods.
It is understood that the memories (the first memory 703 and the second memory 803) of the embodiments of the present application may be volatile memories or nonvolatile memories, and may include both volatile and nonvolatile memories. Among them, the nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic random access Memory (FRAM), a magnetic random access Memory (Flash Memory), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), synchronous Static Random Access Memory (SSRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), enhanced Synchronous Dynamic Random Access Memory (ESDRAM), enhanced Synchronous Dynamic Random Access Memory (Enhanced DRAM), synchronous Dynamic Random Access Memory (SLDRAM), direct Memory (DRmb Access), and Random Access Memory (DRAM). The memories described in the embodiments of the present application are intended to comprise, without being limited to, these and any other suitable types of memory.
In an exemplary embodiment, a storage medium, specifically a computer-readable storage medium, is further provided in the embodiments of the present application, and for example, includes a first memory 703 storing a computer program, which may be executed by the first processor 702 of the first base station 700 to complete the steps of the foregoing base station side method. For example, the second memory 803 may store a computer program, which may be executed by the second processor 802 of the control node 800 to perform the steps of the control node side method described above. The computer readable storage medium may be Memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash Memory, magnetic surface Memory, optical disk, or CD-ROM.
The technical means described in the embodiments of the present application may be arbitrarily combined without conflict.
The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.
Claims (20)
1. A method for calibrating a base station, the method comprising:
a first base station sends a first type of reference signal to a second base station;
the first base station sends a second type of reference signal to the second base station; wherein the content of the first and second substances,
the first type of reference signals sent by the first base station are used for the second base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
2. The method of claim 1, further comprising:
the first base station receives a first type of reference signal sent by the second base station;
and based on the received first type of reference signals sent by the second base station, the first base station acquires a first receiving matrix and a first initial precoding matrix.
3. The method of claim 2, wherein the obtaining, by the first base station, a first receiving matrix and a first initial precoding matrix based on the received first type of reference signals transmitted by the second base station comprises:
based on the received first type of reference signals sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;
and the first base station corrects the calculated second receiving matrix and the second initial precoding matrix to obtain a first receiving matrix and a first initial precoding matrix.
4. The method of claim 3, further comprising:
and the first base station reports the first receiving matrix and the first initial precoding matrix to a control node.
5. The method of claim 2, wherein the obtaining, by the first base station, a first receiving matrix and a first initial precoding matrix based on the received first type of reference signals transmitted by the second base station comprises:
based on the received first type of reference signals sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;
the first base station reports the calculated second receiving matrix and the second initial precoding matrix to a control node;
the first base station receives a first receiving matrix and a first initial precoding matrix issued by the control node; wherein the content of the first and second substances,
and the control node corrects a second receiving matrix and a second initial precoding matrix reported by the first base station to obtain the first receiving matrix and the first initial precoding matrix.
6. The method of claim 1, wherein the first base station transmits a second type of reference signal to the second base station, comprising:
and the first base station sends the precoded second-class reference signals to the second base station.
7. The method of claim 1, further comprising:
the first base station receives a second type of reference signal sent by the second base station;
the first base station reports a received signal of a second type of reference signal sent by the second base station to a control node; wherein the content of the first and second substances,
the received signal is determined based on a first receive matrix and a first initial precoding matrix of the first base station.
8. The method of any one of claims 1 to 7, further comprising:
and the first base station transmits the first type of reference signals and/or the second type of reference signals through a plurality of antennas.
9. The method of claim 1, wherein the second base station is a reference base station; the method further comprises the following steps:
the first base station receives a calibration coefficient issued by a control node; wherein, the first and the second end of the pipe are connected with each other,
the calibration coefficient can be obtained by performing weighted average calculation on the calibration coefficients at different moments by the control node.
10. A base station calibration method is applied to a control node, and comprises the following steps:
determining a calibration coefficient between two base stations based on a received signal, a second-class reference signal, a receiving matrix and an initial precoding matrix of each base station in the two base stations; wherein the content of the first and second substances,
in the two base stations, a first received signal of a first base station represents a received signal related to a second type of reference signal sent by the second base station, and the first received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station; the first receiving matrix and the first initial precoding matrix are determined based on the first type of reference signals sent by the second base station; the first type of reference signals are used for a base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
11. The method of claim 10, wherein the calibration coefficients are calculated by weighted averaging of the calibration coefficients at different times by the control node.
12. The method of claim 10, further comprising:
and receiving a receiving matrix and a precoding matrix uploaded by each of the two base stations.
13. The method of claim 12, further comprising:
correcting a receiving matrix and a pre-coding matrix uploaded by a base station;
and issuing the corrected receiving matrix and the corrected precoding matrix to the corresponding base station.
14. A base station calibration apparatus, comprising:
a first transmitting unit, configured to transmit a first type of reference signal to a second base station;
a second sending unit, configured to send a second type of reference signal to the second base station; wherein the content of the first and second substances,
the transmitted first type of reference signals are used for the second base station to acquire a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
15. A base station calibration apparatus, comprising:
a determining unit, configured to determine a calibration coefficient between two base stations based on a received signal, a second-class reference signal, a received matrix, and an initial precoding matrix of each of the two base stations; wherein the content of the first and second substances,
in the two base stations, a first received signal of a first base station represents a received signal related to a second type of reference signal sent by the second base station, and the first received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station; the first receiving matrix and the first initial precoding matrix are determined based on the first type of reference signals sent by the second base station; the first type of reference signals are used for a base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
16. A first base station, comprising: a first processor and a first communication interface; wherein the content of the first and second substances,
the first communication interface is used for sending a first type of reference signal to a second base station; and for transmitting a second type of reference signal to the second base station; wherein the content of the first and second substances,
the first type of reference signals sent by the first base station are used for the second base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
17. A control node, comprising: a second processor and a second communication interface; wherein the content of the first and second substances,
the second processor is configured to determine a calibration coefficient between two base stations based on a received signal of each of the two base stations, a second-class reference signal, a received matrix, and an initial precoding matrix; wherein the content of the first and second substances,
in the two base stations, a first received signal of a first base station represents a received signal of a second type of reference signal related to the second base station, and the first received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station; the first receiving matrix and the first initial precoding matrix are determined based on a first type of reference signals of a second base station received by a first base station; the first type of reference signals are used for a base station to obtain a receiving matrix and an initial precoding matrix; the second type of reference signal is characterized as a calibration signal.
18. A first base station, comprising: a first processor and a first memory for storing a computer program capable of running on the processor,
wherein the first processor is adapted to perform the steps of the method of any one of claims 1 to 9 when running the computer program.
19. A control node, comprising: a second processor and a second memory for storing a computer program capable of running on the processor,
wherein the second processor is adapted to perform the steps of the method of claim 10 or 13 when running the computer program.
20. A storage medium having a computer program stored thereon, the computer program, when being executed by a processor, implementing the steps of the method according to any one of claims 1 to 9; or to implement the steps of the method of claim 10 or 13.
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