Channel calibration method, device, base station and storage medium

Abstract

The present application discloses a base station calibration method, device, base station, control node and storage medium, wherein, for each of two base stations performing inter-base station calibration, the method includes: the first base station sends a first type of reference signal to the second base station; the first base station sends a second type of reference signal to the second base station; wherein the first type of reference signal sent by the first base station is used by 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

[0001] The present application relates to the field of communication technology, and in particular to a channel calibration method, device, base station and storage medium. Background Art

[0002] In the process of communication between base stations, in order to better ensure the reciprocity of uplink and downlink channels, calibration between base stations is required. In related technologies, calibration between base stations is mainly performed through a single antenna, such as Figure 1 As shown, this inter-base station calibration method has a wide beam, the calibration signal is not very directive, and the calibration accuracy is limited. Summary of the invention

[0003] To solve related technical problems, the embodiments of the present application provide a base station calibration method, device, base station, control node and storage medium.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] The present application provides a base station calibration method, the method comprising:

[0006] The first base station sends a first type of reference signal to the second base station;

[0007] The first base station sends a second type of reference signal to the second base station; wherein,

[0008] The first type of reference signal sent by the first base station is used by 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.

[0009] Wherein, in the above scheme, the method further comprises:

[0010] The first base station receives a first type of reference signal sent by the second base station;

[0011] Based on the received first type of reference signal sent by the second base station, the first base station obtains a first receiving matrix and a first initial precoding matrix.

[0012] In the above solution, based on the received first type of reference signal sent by the second base station, the first base station obtains a first receiving matrix and a first initial precoding matrix, including:

[0013] Based on the received first type of reference signal sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;

[0014] The first base station modifies the calculated second receiving matrix and the second initial precoding matrix to obtain the first receiving matrix and the first initial precoding matrix.

[0015] In the above scheme, the method further includes:

[0016] The first base station reports the first receiving matrix and the first initial precoding matrix to the control node.

[0017] In the above solution, based on the received first type of reference signal sent by the second base station, the first base station obtains a first receiving matrix and a first initial precoding matrix, including:

[0018] Based on the received first type of reference signal sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;

[0019] The first base station reports the calculated second receiving matrix and the second initial precoding matrix to the control node;

[0020] The first base station receives a first receiving matrix and a first initial precoding matrix sent by the control node; wherein,

[0021] The first receiving matrix and the first initial precoding matrix are obtained by the control node modifying the second receiving matrix and the second initial precoding matrix reported by the first base station.

[0022] In the above solution, the first base station sends the second type of reference signal to the second base station, including:

[0023] The first base station sends a second type of reference signal after precoding processing to the second base station.

[0024] In the above scheme, the method further includes:

[0025] The first base station receives a second type of reference signal sent by the second base station;

[0026] The first base station reports a received signal of the second type of reference signal sent by the second base station to the control node; wherein,

[0027] The received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station.

[0028] In the above scheme, the method further includes:

[0029] The first base station sends a first type of reference signal and / or a second type of reference signal through multiple antennas.

[0030] In the above solution, the second base station is a reference base station; and the method further includes:

[0031] The first base station receives the calibration coefficient sent by the control node; wherein,

[0032] The calibration coefficient may be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

[0033] The present application also provides a base station calibration method, which is applied to a control node, and the method includes:

[0034] Based on the received signal of each of the two base stations, the second type of reference signal, the received matrix, and the initial precoding matrix, a calibration coefficient between the two base stations is determined; wherein,

[0035] In the two base stations, the first received signal of the first base station represents a received signal about the second type of reference signal sent by the second base station, and the first received signal is determined based on the first received matrix and the first initial precoding matrix of the first base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal sent by the second base station; the first type of reference signal is used by the base station to obtain the received matrix and the initial precoding matrix; the second type of reference signal is characterized as a calibration signal.

[0036] Among them, in the above scheme, the calibration coefficient can be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

[0037] In the above scheme, the method further includes:

[0038] A receiving matrix and a precoding matrix uploaded by each of the two base stations are received.

[0039] In the above scheme, the method further includes:

[0040] Modify the receiving matrix and precoding matrix uploaded by the base station;

[0041] The corrected receiving matrix and precoding matrix are sent to the corresponding base station.

[0042] The present application also provides a base station calibration device, including:

[0043] A first sending unit, configured to send a first type of reference signal to a second base station;

[0044] The second sending unit is used to send a second type of reference signal to the second base station; wherein,

[0045] The first type of reference signal sent is used by 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.

[0046] The present application also provides a base station calibration device, including:

[0047] A determination unit is used to determine the calibration coefficient between the two base stations based on the received signal of each base station in the two base stations, the second type of reference signal and the received matrix, and the initial precoding matrix; wherein,

[0048] In the two base stations, the first received signal of the first base station represents a received signal about the second type of reference signal sent by the second base station, and the first received signal is determined based on the first received matrix and the first initial precoding matrix of the first base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal sent by the second base station; the first type of reference signal is used by the base station to obtain the received matrix and the initial precoding matrix; the second type of reference signal is characterized as a calibration signal.

[0049] The embodiment of the present application further provides a first base station, comprising: a first processor and a first communication interface; wherein:

[0050] The first communication interface is used to send a first type of reference signal to the second base station; and is used to send a second type of reference signal to the second base station; wherein,

[0051] The first type of reference signal sent by the first base station is used by 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.

[0052] The embodiment of the present application further provides a control node, including: a second processor and a second communication interface; wherein,

[0053] The second processor is used to determine the calibration coefficient between the two base stations based on the received signal of each base station in the two base stations, the second type of reference signal and the received matrix, and the initial precoding matrix; wherein,

[0054] In the two base stations, the first received signal of the first base station represents a received signal about the second type of reference signal sent by the second base station, and the first received signal is determined based on the first received matrix and the first initial precoding matrix of the first base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal sent by the second base station; the first type of reference signal is used by the base station to obtain the received matrix and the initial precoding matrix; the second type of reference signal is characterized as a calibration signal.

[0055] The embodiment of the present application further provides a base station, comprising: a first processor and a first memory for storing a computer program that can be run on the processor,

[0056] Wherein, the first processor is used to execute the steps of any base station calibration method on the base station side when running the computer program.

[0057] The embodiment of the present application further provides a control node, comprising: a second processor and a second memory for storing a computer program that can be run on the processor,

[0058] Wherein, the second processor is used to execute the steps of any base station calibration method on the control node side when running the computer program.

[0059] An embodiment of the present application also provides a storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of the first base station calibration method on the base station side are implemented; or the steps of any base station calibration method on the control node side are implemented.

[0060] The base station calibration method, device, base station, control node and storage medium provided in the embodiments of the present application, wherein, 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 obtains a receiving matrix and an initial precoding matrix based on the first type of reference signal received from another base station. On the basis that each base station sends the above two types of reference signals, the calibration between base stations can be completed based on a more directional beam, thereby achieving high-precision calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A schematic diagram of base station calibration for related technologies;

[0062] Figure 2 This is a flow chart of a base station calibration method according to an embodiment of the present application;

[0063] Figure 3 This is another flow chart of a base station calibration method according to an embodiment of the present application.

[0064] Figure 4 This is a schematic diagram of base station calibration according to an embodiment of the present application;

[0065] Figure 5 This is a schematic diagram of the structure of a base station calibration device according to an embodiment of the present application;

[0066] Figure 6 This is a schematic diagram of the structure of another base station calibration device according to an embodiment of the present application;

[0067] Figure 7 This is a schematic diagram of the structure of the first base station in an embodiment of the present application;

[0068] Figure 8 This is a schematic diagram of the control node structure of an embodiment of the present application. DETAILED DESCRIPTION

[0069] Distributed ultra-large-scale multiple-input multiple-output (MIMO) is a new type of distributed multi-input multiple-output (MIMO) technology for the sixth generation of mobile communication technology (6G, 6 th Distributed ultra-large-scale MIMO is a solution to the higher capacity communication needs of the New Generation. Through coherent / incoherent transmission of multiple base stations, distributed ultra-large-scale MIMO can eliminate interference and improve user experience on the one hand, and can improve overall capacity on the other hand, and has good application prospects in high-capacity scenarios. In a distributed ultra-large-scale MIMO system, the base station needs to pre-process user data based on the downlink channel information. For the time-division duplex (TDD) system, since the transmission and reception share the same propagation channel and the transmission and reception frequencies are also the same, it can be theoretically considered that the uplink propagation channel is equal to the downlink propagation channel. In other words, the uplink channel and the downlink channel are reciprocal. However, in actual applications, the RF end of the antenna requires two sets of circuits to complete the transmission and reception of the signal respectively. The process error of the hardware and the nonlinear distortion of the amplifier will make the two sets of circuits at the RF end have exactly the same characteristics. Therefore, in the TDD system, the reciprocity of the uplink channel and the downlink channel is impaired. In addition, the characteristic response of each RF circuit also changes with environmental factors such as temperature and humidity and time. From the perspective of the impact on the baseband signal, the transmitting channel and the receiving channel equivalently multiply their respective signals by different coefficients, which also causes the reciprocity of the uplink channel and the downlink channel to be damaged.

[0070] In order to achieve reciprocity between the uplink channel and the downlink channel, the RF link needs to be calibrated. In the related art, for distributed ultra-large-scale MIMO systems, calibration is mainly performed through hardware calibration method and air interface calibration method. Among them, the hardware calibration method connects the calibration ports of multiple base stations through cables, and calibration is performed on this basis. For MIMO systems with a large number of distributed nodes, the hardware calibration method has high requirements for cables, which limits large-scale deployment. The air interface calibration method can calibrate the transceiver channels between multiple distributed base stations through user feedback information or base station transceiver calibration signals. However, referring to Figure 1 ,The above channel calibration process is mainly performed by a single antenna with a wide beam and weak ,directivity of the calibration signal, which leads to limited calibration accuracy and ,is difficult to meet the calibration accuracy requirements of the distributed ultra-large-scale MIMO ,system.

[0071] Based on this, the embodiments of the present application provide a base station calibration method, device, base station, control node and storage medium, wherein, for two base stations performing inter-base station calibration, one of the base stations (the first base station) sends a first type of reference signal of the first base station to the other base station (the second base station), and each base station obtains a receiving matrix and an initial precoding matrix based on the first type of reference signal received from the opposite base station. 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 signal of the first base station to the second base station, where the second type of reference signal is a calibration signal.

[0072] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0073] The embodiment of the present application provides a base station calibration method, which is applied to each of the two base stations that perform inter-base station calibration. That is to say, during the inter-base station calibration process, each of the two base stations needs to execute the steps in the method described below. Here, the two base stations that perform inter-base station calibration are distinguished by "first base station" and "second base station". It should be noted that: "first base station" and "second base station" are only used to distinguish two different base stations when describing the embodiment, and are not used to describe a specific function, sequence or sequence.

[0074] like Figure 2 As shown, the method includes:

[0075] Step 201: A first base station sends a first type of reference signal to a second base station.

[0076] The first type of reference signal sent by the first base station is used by the second base station to obtain a receiving matrix and an initial precoding matrix.

[0077] In one embodiment, the method further comprises:

[0078] The first base station receives a first type of reference signal sent by the second base station;

[0079] Based on the received first type of reference signal sent by the second base station, the first base station obtains a first receiving matrix and a first initial precoding matrix.

[0080] In this paper, it is assumed that the two base stations for inter-base station calibration are BS i and BS j In actual application, the base station BS i To the base station BS j Sending base station BS i The first type of reference signal, base station BS j Also to the base station BS i Sending base station BS j The first type of reference signal. Base station BSi By receiving the base station BS j The first type of reference signal obtains the channel matrix, and then obtains the receiving matrix U i and the initial precoding matrix V i , similarly, the base station BS j By receiving the base station BS i The first type of reference signal obtains the channel matrix, and then obtains the receiving matrix U j and the initial precoding matrix V j .

[0081] Here, the two base stations performing inter-base station calibration obtain their respective receiving matrices and initial precoding matrices by sending first-class reference signals to each other, and use the obtained receiving matrices and initial precoding matrices for the reception and transmission of second-class reference signals (calibration signals). In actual application, it is necessary to correct the receiving matrix and initial precoding matrix obtained by initial calculation based on the received first-class reference signal to determine the receiving matrix and initial precoding matrix actually used for the reception and transmission of the calibration signal. Based on this, in one embodiment, the first base station obtains the first receiving matrix and the first initial precoding matrix based on the received first-class reference signal sent by the second base station, including:

[0082] Based on the received first type of reference signal sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;

[0083] The first base station modifies the calculated second receiving matrix and the second initial precoding matrix to obtain the first receiving matrix and the first initial precoding matrix.

[0084] In one embodiment, the method further comprises:

[0085] The first base station reports the first receiving matrix and the first initial precoding matrix to the control node.

[0086] Here, the base station completes the correction of the receiving matrix and the initial precoding matrix to determine the receiving matrix and the initial precoding matrix used for the calibration signal transmission and reception.

[0087] In actual application, when the base station completes the correction of the receiving matrix and the initial precoding matrix, the base station also needs to report the corrected receiving matrix and the initial precoding matrix to the control node, so that the control node can subsequently complete the calculation of the calibration coefficient based on the receiving matrix and the initial precoding matrix of each base station.

[0088] In one embodiment, the first base station acquiring 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:

[0089] Based on the received first type of reference signal sent by the second base station, the first base station calculates a second receiving matrix and a second initial precoding matrix;

[0090] The first base station reports the calculated second receiving matrix and the second initial precoding matrix to the control node;

[0091] The first base station receives a first receiving matrix and a first initial precoding matrix sent by the control node; wherein,

[0092] The first receiving matrix and the first initial precoding matrix are obtained by the control node modifying the second receiving matrix and the second initial precoding matrix reported by the first base station.

[0093] Here, the base station may also choose to report the receiving matrix and the initial precoding matrix initially calculated based on the received first type of reference signal to the control node, and the control node will complete the correction of the receiving matrix and the initial precoding matrix. After the correction is completed, the corrected receiving matrix and the initial precoding matrix will be sent to the corresponding base station for receiving and sending calibration signals.

[0094] Step 202: The first base station sends a second type of reference signal to the second base station.

[0095] The second type of reference signal is characterized as a calibration signal.

[0096] In one embodiment, the method further comprises:

[0097] The first base station receives a second type of reference signal sent by the second base station;

[0098] The first base station reports a reception signal of the second-type reference signal sent by the second base station to a control node.

[0099] The received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station.

[0100] In actual application, the base station BS i To the base station BS j Sending base station BS i The second type of reference signal, base station BS j Also to the base station BS i Sending base station BS j The second type of reference signal. i Base station BS j The received signal Y of the second type of reference signal i Report to the control node, similarly, the base station BS jBase station BS i The received signal Y of the first type reference signal j The received signals are reported 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 to determine the corresponding calibration coefficients.

[0101] Here, the received signal is determined based on the first receiving matrix and the first initial precoding matrix of the first base station. j For base station BS i The received signal Y of the second type of reference signal j It can be expressed as That is to say

[0102]

[0103] Among them, U j Base Station BS j The receiving matrix, R j Base Station BS j The diagonal receive mismatch matrix is, T i Base Station BS i The diagonal transmission mismatch matrix, H ji is the actual channel matrix (satisfying uplink and downlink reciprocity), V i is the precoding matrix, S i Base Station BS i The second type of reference signal (calibration signal) sent, N j is the noise matrix,

[0104] Accordingly, the base station BS i For base station BS j The received signal Y of the second type of reference signal i It can be expressed as That is to say

[0105]

[0106] Among them, U i Base Station BS i The receiving matrix, R i Base Station BS i The diagonal receive mismatch matrix is, T j Base Station BS j The diagonal transmission mismatch matrix, H ji is the actual channel matrix (satisfying uplink and downlink reciprocity), V j is the precoding matrix, Sj Base Station BS j The second type of reference signal (calibration signal) sent, N i is the noise matrix,

[0107] In this way, the received signal reported by the first base station to the control node carries relevant information of the first receiving matrix and the first initial precoding matrix. The control node will subsequently determine the calibration coefficient based on the received signal, the second type of reference signal, the receiving matrix, and the initial precoding matrix reported by each base station, so that the calibration between base stations can be completed based on a more directional beam, thereby achieving high-precision calibration.

[0108] In one embodiment, the method further comprises:

[0109] The first base station sends a first type of reference signal and / or a second type of reference signal through multiple antennas.

[0110] Since the calibration signal sent by each base station is a single-stream signal, before sending the second-type reference signal, it is necessary to perform precoding processing on the second-type reference signal and then send it after forming a beam.

[0111] Therefore, in one embodiment, the first base station sends the second type of reference signal to the second base station, including:

[0112] The first base station sends a second type of reference signal after precoding processing to the second base station.

[0113] In actual application, the second base station is used as a reference base station, and the first base station needs to be calibrated. In this case, the method further includes:

[0114] The first base station receives the calibration coefficient sent by the control node; wherein,

[0115] The calibration coefficient may be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

[0116] Figure 3 The implementation process of the base station calibration method provided by another embodiment of the present application is shown, which is applied to the control node, referring to Figure 3 , the method comprising:

[0117] Step 301: Based on a received signal of each of the two base stations, a second type of reference signal, a receiving matrix, and an initial precoding matrix, a calibration coefficient between the two base stations is determined.

[0118] Among them, among the two base stations, the first received signal of the first base station represents a received signal about the second type of reference signal sent by the second base station, and the first received signal is determined based on the first received matrix and the first initial precoding matrix of the first base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal sent by the second base station; the first type of reference signal is used for the base station to obtain the received matrix and the initial precoding matrix; the second type of reference signal is characterized as a calibration signal.

[0119] In one embodiment, the method further comprises:

[0120] A receiving matrix and a precoding matrix uploaded by each of the two base stations are received.

[0121] In one embodiment, the method further comprises:

[0122] Modify the receiving matrix and precoding matrix uploaded by the base station;

[0123] The corrected receiving matrix and precoding matrix are sent to the corresponding base station.

[0124] In actual application, the base station can complete the correction of the receiving matrix and the initial precoding matrix to determine the receiving matrix and the initial precoding matrix used for calibrating signal transmission and reception. In the case where the base station completes the correction of the receiving matrix and the initial precoding matrix, the base station also needs to report the corrected receiving matrix and the initial precoding matrix to the control node, so that the control node can subsequently complete the calculation of the calibration coefficient based on the receiving matrix and the initial precoding matrix of each base station.

[0125] Alternatively, in actual application, the base station may also choose to report the receiving matrix and the initial precoding matrix initially calculated based on the received first type of reference signal to the control node, and the control node will complete the correction of the receiving matrix and the initial precoding matrix. After the correction is completed, the corrected receiving matrix and the initial precoding matrix will be sent to the corresponding base station for receiving and sending calibration signals.

[0126] Here, the control node is a network entity. After acquiring the received signals, calibration signals, receiving matrices, and initial precoding matrices of the two base stations, the control node performs channel estimation through the received signals and calibration signals to obtain the second channel matrices corresponding to the two base stations. and When the noise is ignored, we have:

[0127]

[0128]

[0129] In actual application, the base station BSj With base station BS i Due to the mismatch between the transmit and receive channels, there is a T i ≠R i , T j ≠R j , and T i ≠T j , R i ≠R j Assuming that the channel in a single base station has been calibrated, then T i With R i The ratio of the diagonal elements is a i , T j With R j The ratio of the diagonal elements is b j , a i With b j are all complex numbers containing amplitude and phase. Based on this, the transmit and receive mismatch matrices of the two base stations have the following relationship:

[0130] T i (R i ) -1 =c ji (T j (R j ) -1 )

[0131] That is a i =c ji b j , where c ji is the calibration coefficient to be determined, c ji It is a complex number, which includes the amplitude difference and phase difference between the two base station receiving and transmitting channels.

[0132] Assume U i =V i , U j =V j , since the calibration signal is a single-stream signal, and The calibration factor is then calculated as:

[0133]

[0134] That is, the calibration factor

[0135] In one embodiment, the calibration coefficient may be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

[0136] Here, the calibration coefficients at different times are weighted averaged based on the time domain, that is, different calibration coefficients c are obtained at K times. ji (k), and then perform weighted average

[0137]

[0138] Among them, β k is the weighting coefficient at the kth moment.

[0139] In this way, the control node will c ji It is sent to the base station that needs to be calibrated among the two base stations, and the base station multiplies c on each transmission channel. ji The calibration is then complete.

[0140] In the base station calibration method provided in the embodiment of the present application, for two base stations that perform inter-base station calibration, each base station sends a first type of reference signal and a calibration signal to the other base station, and each base station obtains a receiving matrix and an initial precoding matrix based on the first type of reference signal received from the other base station. On the basis that each base station sends the above two types of reference signals, the calibration between base stations can be completed based on a more directional beam, thereby achieving high-precision calibration. In the application scenario of a distributed very large-scale MIMO system, the above base station calibration method can make full use of the system characteristics of distributed very large-scale MIMO, such as Figure 4 As shown, a highly directional beam is formed between base stations, thereby achieving higher-precision calibration and effectively improving the capacity of the distributed ultra-large-scale MIMO system.

[0141] In order to implement the method on the base station side of the embodiment of the present application, the embodiment of the present application also provides a base station calibration device, which is arranged on each of the two base stations performing inter-base station calibration, such as Figure 5 As shown, the device comprises:

[0142] A first sending unit 501 is configured to send a first type of reference signal to a second base station;

[0143] The second sending unit 502 is configured to send a second type of reference signal to the second base station.

[0144] The first type of reference signal sent is used by 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.

[0145] In one embodiment, the device further comprises:

[0146] A first receiving unit, configured to receive a first type of reference signal sent by the second base station;

[0147] The first acquisition unit is configured to acquire a first receiving matrix and a first initial precoding matrix based on a received first type of reference signal sent by the second base station.

[0148] In one embodiment, the first acquiring unit is used to:

[0149] Calculate a second receiving matrix and a second initial precoding matrix based on the received first reference signal sent by the second base station;

[0150] The calculated second receiving matrix and the second initial precoding matrix are modified to obtain the first receiving matrix and the first initial precoding matrix.

[0151] In one embodiment, the device further comprises:

[0152] The first reporting unit is configured to report the first receiving matrix and the first initial precoding matrix to the control node.

[0153] In one embodiment, the first acquiring unit is used to:

[0154] Calculate a second receiving matrix and a second initial precoding matrix based on the received first reference signal sent by the second base station;

[0155] Reporting the calculated second receiving matrix and the second initial precoding matrix to the control node;

[0156] A first receiving matrix and a first initial precoding matrix sent by the control node are received.

[0157] The first receiving matrix and the first initial precoding matrix are obtained by the control node modifying the second receiving matrix and the second initial precoding matrix reported by the first base station.

[0158] In one embodiment, the second sending unit 502 is used to:

[0159] Sending the second reference signal after precoding processing to the second base station.

[0160] In one embodiment, the device further comprises:

[0161] A second receiving unit, configured to receive a second type of reference signal sent by the second base station;

[0162] The second reporting unit is configured to report a received signal of the second type of reference signal sent by the second base station to a control node.

[0163] The received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station.

[0164] In one embodiment, the first sending unit 501 sends the first type of reference signal through multiple antennas and / or the second sending unit 502 sends the second type of reference signal through multiple antennas.

[0165] In one embodiment, the second base station is a reference base station; and the apparatus further includes:

[0166] The third receiving unit is used to receive the calibration coefficient sent by the control node.

[0167] The calibration coefficient may be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

[0168] In actual application, the first sending unit 501, the second sending unit 502 and the first receiving unit, the first reporting unit, the second receiving unit, and the second reporting unit can be implemented by the communication interface in the base station calibration device; the first acquisition unit can be implemented by the processor in the base station calibration device combined with the communication interface.

[0169] In order to implement the method on the control node side of the embodiment of the present application, the embodiment of the present application also provides a base station calibration device, which is set on the control node, such as Figure 6 As shown, the device comprises:

[0170] The determination unit 601 is configured to determine a calibration coefficient between the two base stations based on a received signal of each of the two base stations, a second type of reference signal, a received matrix, and an initial precoding matrix.

[0171] Among them, among the two base stations, the first received signal of the first base station represents a received signal about the second type of reference signal sent by the second base station, and the first received signal is determined based on the first received matrix and the first initial precoding matrix of the first base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal sent by the second base station; the first type of reference signal is used for the base station to obtain the received matrix and the initial precoding matrix; the second type of reference signal is characterized as a calibration signal.

[0172] In one embodiment, the calibration coefficient may be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

[0173] In one embodiment, the device further comprises:

[0174] The third receiving unit is configured to receive a receiving matrix and a precoding matrix uploaded by each of the two base stations.

[0175] In one embodiment, the device further comprises:

[0176] A correction unit, used to correct the receiving matrix and precoding matrix uploaded by the base station;

[0177] The sending unit is used to send the corrected receiving matrix and precoding matrix to the corresponding base station.

[0178] In actual application, the determination unit 601 and the correction unit may be implemented by a processor in the base station calibration device; the third receiving unit and the sending unit may be implemented by a communication interface in the base station calibration device.

[0179] It should be noted that: the base station calibration device provided in the above embodiment only uses the division of the above program modules as an example when performing base station calibration. In actual applications, the above processing can be assigned to different program modules as needed, that is, the internal structure of the device is divided into different program modules to complete all or part of the above-described processing. In addition, the base station calibration device provided in the above embodiment and the base station calibration method embodiment belong to the same concept, and the specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0180] Based on the hardware implementation of the above program module, and in order to implement the method on the base station side of the embodiment of the present application, the embodiment of the present application also provides a first base station, such as Figure 7 As shown, the first base station 700 includes:

[0181] The first communication interface 701 is capable of exchanging information with other network nodes;

[0182] The first processor 702 is connected to the first communication interface 701 to implement information exchange with other network nodes, and is used to execute the method provided by one or more technical solutions of the first base station side when running a computer program. The computer program is stored in the first memory 703.

[0183] Specifically, the first communication interface 701 is used to send a first type of reference signal to a second base station; and is used to send a second type of reference signal to the second base station.

[0184] The first type of reference signal sent by the first base station is used by 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.

[0185] In one embodiment, the first communication interface 701 is further used for:

[0186] The first base station receives a first type of reference signal sent by the second base station;

[0187] The first processor 702 is configured to acquire a first receiving matrix and a first initial precoding matrix based on a received first reference signal sent by the second base station.

[0188] In one embodiment, the first processor 702 is configured to:

[0189] Based on the received first type of reference signal sent by the second base station, a second receiving matrix and a second initial precoding matrix are calculated; and the calculated second receiving matrix and second initial precoding matrix are corrected to obtain a first receiving matrix and a first initial precoding matrix.

[0190] In one embodiment, the first communication interface 701 is further used for:

[0191] The first receiving matrix and the first initial precoding matrix are reported to the control node.

[0192] In one embodiment, the first processor 702 is configured to:

[0193] Based on the received first type of reference signal sent by the second base station, a second receiving matrix and a second initial precoding matrix are calculated; the calculated second receiving matrix and the second initial precoding matrix are reported to the control node; and the first receiving matrix and the first initial precoding matrix sent by the control node are received.

[0194] The first receiving matrix and the first initial precoding matrix are obtained by the control node modifying the second receiving matrix and the second initial precoding matrix reported by the first base station.

[0195] In one embodiment, the first communication interface 701 is used for:

[0196] Sending the second reference signal after precoding processing to the second base station.

[0197] In one embodiment, the first communication interface 701 is further used for:

[0198] 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 sent by the second base station to a control node.

[0199] The received signal is determined based on a first receiving matrix and a first initial precoding matrix of the first base station.

[0200] In one embodiment, the first communication interface 701 is further used for:

[0201] The first type of reference signal and / or the second type of reference signal are sent through multiple antennas.

[0202] In one embodiment, the second base station is a reference base station; and the first communication interface 701 is further used for:

[0203] Receive the calibration coefficient sent by the control node.

[0204] The calibration coefficient may be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

[0205] It should be noted that the specific processing process of the first processor 702 and the first communication interface 701 can be understood by referring to the base station calibration method on the above-mentioned base station side.

[0206] Of course, in actual application, the various components in the first base station 700 are coupled together through the bus system 704. It can be understood that the bus system 704 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 1204 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, Figure 7 Various buses are labeled as bus system 704 .

[0207] 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 used to operate on the first base station 700.

[0208] The method disclosed in the above embodiment 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 with signal processing capabilities. In the implementation process, each step of the above method can be completed by an integrated logic circuit of hardware or software instructions in the first processor 702. The above-mentioned first processor 702 may be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The first processor 702 can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiment of the present application, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, which is 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 above method in combination with its hardware.

[0209] In an exemplary embodiment, the first base station 700 can be implemented by one or more application-specific integrated circuits (ASIC), DSP, programmable logic device (PLD), complex programmable logic device (CPLD), field-programmable gate array (FPGA), general-purpose processor, controller, microcontroller (MCU), microprocessor, or other electronic components to execute the aforementioned method.

[0210] Based on the hardware implementation of the above program modules, and in order to implement the method of the control node side of the embodiment of the present application, the embodiment of the present application also provides a control node, such as Figure 8 As shown, the control node 800 includes:

[0211] The second communication interface 801 is capable of exchanging information with other network nodes;

[0212] The second processor 802 is connected to the second communication interface 801 to implement information exchange with other network nodes, and is used to execute the method provided by one or more technical solutions of the control node side when running a computer program. The computer program is stored in the second memory 803.

[0213] Specifically, the second processor 802 is configured to:

[0214] Based on the received signal of each of the two base stations, the second type of reference signal, the received matrix, and the initial precoding matrix, a calibration coefficient between the two base stations is determined.

[0215] Among them, among the two base stations, the first received signal of the first base station represents the received signal of the second type of reference signal of the second base station, and the first received signal is determined based on the first received matrix and the first initial precoding matrix of the first base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal of the second base station received by the first base station; the first type of reference signal is used by the base station to obtain the received matrix and the initial precoding matrix; the second type of reference signal is characterized as a calibration signal.

[0216] In one embodiment, the calibration coefficient may be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

[0217] In one embodiment, the second communication interface 801 is used for:

[0218] A receiving matrix and a precoding matrix uploaded by each of the two base stations are received.

[0219] In one embodiment, the second processor 802 is further configured to modify the receiving matrix and the precoding matrix uploaded by the base station;

[0220] The second communication interface 801 is further used to send the modified receiving matrix and precoding matrix to the corresponding base station.

[0221] It should be noted that the specific processing process of the second processor 802 and the second communication interface 801 can be understood by referring to the above method.

[0222] Of course, in actual application, the various components in the control node 800 are coupled together through the bus system 804. It can be understood that the bus system 804 is used to realize the connection and communication between these components. In addition to the data bus, the bus system 804 also includes a power bus, a control bus, and a status signal bus. However, for the sake of clarity, Figure 8 Various buses are labeled as bus system 804 .

[0223] 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 used to operate on the control node 800.

[0224] The method disclosed in the above 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 with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the second processor 802. The above-mentioned second processor 802 may be a general-purpose processor, DSP, or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The second processor 802 can implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor, etc. In combination with the steps of the method disclosed in the embodiment of the present application, it can be directly embodied as a hardware decoding processor to execute, or it can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium, which is located in the second memory 803. The second processor 802 reads the information in the second memory 803 and completes the steps of the above method in combination with its hardware.

[0225] 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 to perform the aforementioned methods.

[0226] It can be understood that the memory (first memory 703, second memory 803) of the embodiment of the present application can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can 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 flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example 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), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DRRAM).The memories described in the embodiments of the present application are intended to include, but are not limited to, these and any other suitable types of memories.

[0227] In an exemplary embodiment, the embodiment of the present application further provides a storage medium, namely a computer storage medium, specifically a computer-readable storage medium, for example, including a first memory 703 storing a computer program, and the computer program can be executed by the first processor 702 of the first base station 700 to complete the steps of the aforementioned base station side method. For another example, a second memory 803 storing a computer program can be executed by the second processor 802 of the control node 800 to complete the steps of the aforementioned control node side method. The computer-readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disk, or CD-ROM.

[0228] In addition, the technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0229] The above description is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application.

Claims

1. A base station calibration method, characterized in that: The method comprises: The first base station sends a first type of reference signal to the second base station; The first base station sends a second type of reference signal to the second base station; wherein, The first type of reference signal sent by the first base station is used by the second base station to obtain a third receiving matrix and a third initial precoding matrix; the second type of reference signal is characterized as a calibration signal; 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 first received signal about a second type of reference signal sent by the second base station to a control node; the first received signal is determined based on a first receiving matrix of the first base station and a third initial precoding matrix of the second base station; the control node is used to determine a calibration coefficient between the first base station and the second base station based on the first received signal of the first base station and the second received signal of the second base station, the second type of reference signal, the first receiving matrix, the first initial precoding matrix, the third receiving matrix and the third initial precoding matrix; wherein, The second received signal of the second base station represents a received signal about a second type of reference signal sent by the first base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal sent by the second base station; the third received matrix and the third initial precoding matrix are determined based on the first type of reference signal sent by the first base station.

2. The method according to claim 1, characterized in that The method further comprises: The first base station receives a first type of reference signal sent by the second base station; Based on the received first type of reference signal sent by the second base station, the first base station obtains a first receiving matrix and a first initial precoding matrix.

3. The method according to claim 2, characterized in that The first base station acquiring 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 signal 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 modifies the calculated second receiving matrix and the second initial precoding matrix to obtain the first receiving matrix and the first initial precoding matrix.

4. The method according to claim 3, characterized in that The method further comprises: The first base station reports the first receiving matrix and the first initial precoding matrix to the control node.

5. The method according to claim 2, characterized in that: The first base station acquiring 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 signal 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 the control node; The first base station receives a first receiving matrix and a first initial precoding matrix sent by the control node; wherein, The first receiving matrix and the first initial precoding matrix are obtained by the control node modifying the second receiving matrix and the second initial precoding matrix reported by the first base station.

6. The method according to claim 1, characterized in that The first base station sending a second type of reference signal to the second base station includes: The first base station sends a second type of reference signal after precoding processing to the second base station.

7. The method according to any one of claims 1 to 6, characterized in that: The method further comprises: The first base station sends a first type of reference signal and / or a second type of reference signal through multiple antennas.

8. The method according to claim 1, characterized in that The second base station is a reference base station; the method further includes: The first base station receives the calibration coefficient sent by the control node; wherein, The calibration coefficient may be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

9. A base station calibration method, characterized in that: Applied to a control node, the method comprises: Based on the first received signal of the first base station and the second received signal of the second base station, the second type of reference signal, the first receiving matrix, the first initial precoding matrix, the third receiving matrix and the third initial precoding matrix, the calibration coefficient between the two base stations is determined; wherein, Among the two base stations, a first received signal of the first base station represents a received signal regarding a second type of reference signal sent by the second base station, and the first received signal is determined based on a first received matrix of the first base station and a third initial precoding matrix of the second base station; a second received signal of the second base station represents a received signal regarding a second type of reference signal sent by the first base station; the first received matrix and the first initial precoding matrix are determined based on a first type of reference signal sent by the second base station; the third received matrix and the third initial precoding matrix are determined based on a first type of reference signal sent by the first base station; and the second type of reference signal is characterized as a calibration signal.

10. The method according to claim 9, characterized in that The calibration coefficient may be obtained by the control node performing weighted average calculation on the calibration coefficients at different times.

11. The method according to claim 9, characterized in that The method further comprises: A receiving matrix and a precoding matrix uploaded by each of the two base stations are received.

12. The method according to claim 11, characterized in that The method further comprises: Modify the receiving matrix and precoding matrix uploaded by the base station; The corrected receiving matrix and precoding matrix are sent to the corresponding base station.

13. A base station calibration device, characterized in that: include: A first sending unit, configured to send a first type of reference signal to a second base station; The second sending unit is used to send a second type of reference signal to the second base station; wherein, The first type of reference signal sent is used by the second base station to obtain a third receiving matrix and a third initial precoding matrix; the second type of reference signal is characterized as a calibration signal; The device also includes: A second receiving unit, configured to receive a second type of reference signal sent by the second base station; A second reporting unit is used to report a first received signal about a second type of reference signal sent by the second base station to a control node; the first received signal is determined based on a first receiving matrix and a third initial precoding matrix of the second base station; the control node is used to determine a calibration coefficient between the second base station and the second received signal of the second base station, the second type of reference signal, the first receiving matrix, the first initial precoding matrix, the third receiving matrix and the third initial precoding matrix; wherein, The second received signal of the second base station represents a received signal about the second type of reference signal sent to the second base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal sent by the second base station; the third received matrix and the third initial precoding matrix are determined based on the first type of reference signal sent to the second base station.

14. A base station calibration device, characterized in that: include: A determination unit is used to determine the calibration coefficient between the two base stations based on the first received signal of the first base station and the second received signal of the second base station, the second type of reference signal, the first receiving matrix, the first initial precoding matrix, the third receiving matrix and the third initial precoding matrix; wherein, Among the two base stations, a first received signal of the first base station represents a received signal regarding a second type of reference signal sent by the second base station, and the first received signal is determined based on a first received matrix of the first base station and a third initial precoding matrix of the second base station; a second received signal of the second base station represents a received signal regarding a second type of reference signal sent by the first base station; the first received matrix and the first initial precoding matrix are determined based on a first type of reference signal sent by the second base station; the third received matrix and the third initial precoding matrix are determined based on a first type of reference signal sent by the first base station; and the second type of reference signal is characterized as a calibration signal.

15. A first base station, characterized in that: include: A first processor and a first communication interface; wherein, The first communication interface is used to send a first type of reference signal to the second base station; and is used to send a second type of reference signal to the second base station; wherein, The first type of reference signal sent by the first base station is used by the second base station to obtain a third receiving matrix and a third initial precoding matrix; the second type of reference signal is characterized as a calibration signal; The first communication interface is also used to receive a second type of reference signal sent by the second base station, and report a first received signal about the second type of reference signal sent by the second base station to the control node; the first received signal is determined based on the first receiving matrix of the first base station and the third initial precoding matrix of the second base station; the control node is used to determine the calibration coefficient between the first base station and the second base station based on the first received signal of the first base station and the second received signal of the second base station, the second type of reference signal, the first receiving matrix, the first initial precoding matrix, the third receiving matrix and the third initial precoding matrix; wherein, The second received signal of the second base station represents a received signal about a second type of reference signal sent by the first base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal sent by the second base station; the third received matrix and the third initial precoding matrix are determined based on the first type of reference signal sent by the first base station.

16. A control node, characterized in that: include: A second processor and a second communication interface; wherein, The second processor is used to determine the calibration coefficient between the two base stations based on the first received signal of the first base station and the second received signal of the second base station, the second type of reference signal, the first receiving matrix, the first initial precoding matrix, the third receiving matrix and the third initial precoding matrix; wherein, In the two base stations, the first received signal of the first base station represents the received signal of the second type of reference signal of the second base station, and the first received signal is determined based on the first received matrix of the first base station and the third initial precoding matrix of the second base station; the second received signal of the second base station represents the received signal of the second type of reference signal sent by the first base station; the first received matrix and the first initial precoding matrix are determined based on the first type of reference signal of the second base station received by the first base station; the third received matrix and the third initial precoding matrix are determined based on the first type of reference signal sent by the first base station; the second type of reference signal is characterized as a calibration signal.

17. A first base station, characterized in that: include: a first processor and a first memory for storing a computer program executable on the processor, Wherein, when the first processor is used to run the computer program, the steps of the method described in any one of claims 1 to 8 are executed.

18. A control node, characterized in that: include: a second processor and a second memory for storing a computer program executable on the processor, Wherein, when the second processor is used to run the computer program, the steps of the method described in any one of claims 9 to 12 are executed.

19. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented; or the steps of the method according to any one of claims 9 to 12 are implemented.

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