Method and system for suppressing interference between base stations

Abstract

An embodiment of the present invention provides a method and system for suppressing interference between base stations. The method includes: a cluster head base station of a cluster of victim base stations sends auxiliary information and an interference reference signal to a interfering base station, and monitors a response signal fed back by the interfering base station; wherein, base stations within the cluster of victim base stations are all subject to remote interference from the interfering base station, and the auxiliary information is determined according to the interference information of each base station within the cluster of victim base stations; when the interfering base station detects the interference reference signal, it performs remote interference suppression on the cluster of victim base stations according to the auxiliary information, and feeds back a response signal to the cluster head base station; when the cluster head base station detects the response signal, it re-sends the interference reference signal to the interfering base station, and returns to the step of monitoring the response signal fed back by the interfering base station, until the interfering base station can no longer detect the interference reference signal and / or the cluster head base station can no longer detect the response signal. It can save a large amount of signaling overhead on the air interface and / or the backhaul link, and greatly reduce the delay of interference suppression.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and particularly to a method and system for suppressing interference between base stations. Background Art

[0002] Under certain meteorological conditions, electromagnetic waves in the atmospheric boundary layer are easily affected by atmospheric refraction, resulting in the bending of the propagation trajectory towards the ground. The electromagnetic waves are trapped in a thin atmospheric layer of a certain thickness as if they are propagating in a waveguide. This phenomenon is called the atmospheric duct phenomenon. Electromagnetic waves can propagate over long distances with low loss in the atmospheric duct. Therefore, the atmospheric duct will cause long-distance co-frequency interference to time-division communication systems.

[0003] In a TDD (time division duplexing) system, the uplink and downlink signals are transmitted on the same carrier frequency but in different subframes. To prevent the uplink signal of a base station from falling into the uplink subframe of an adjacent base station after transmission delay and generating co-frequency interference between base stations, 3GPP (3rd Generation Partnership Project) designed special subframes and guard intervals. However, when the atmospheric duct occurs, the downlink signal of a remote base station reaches the proximal base station after long-distance propagation. Since the propagation delay exceeds the guard interval and the intensity attenuation is very small, it will cause remote interference to the uplink signal of the proximal base station. In a 5G (5th Generation Mobile Communication Technology) network, the TDD system is mainly adopted and the time slot ratio is more flexible. Therefore, the remote interference is more obvious and may even lead to service interruption in severe cases, affecting the user experience.

[0004] To solve the remote interference caused by the atmospheric duct, there are currently several remote interference suppression frameworks and various remote interference suppression strategies based on the time domain, frequency domain, spatial domain, and power domain.

[0005] However, these suppression frameworks and suppression strategies all consider the situation of one disturbed base station and one interfering base station. The disturbed base station and the interfering base station communicate through reference signals on the air interface or through the backhaul link. However, the spatial span of the atmospheric duct is very large and can span several kilometers to hundreds of kilometers in the horizontal direction. Based on this characteristic, the downlink signal of a certain interfering base station will interfere with the uplink signals of multiple disturbed base stations, that is, there will be a situation where multiple disturbed base stations correspond to the same interfering base station.

[0006] Since the existing remote interference suppression framework corresponds to one interfering base station for each interfered base station, it is necessary for each interfered base station to communicate with the interfering base station separately to achieve interference suppression, which will result in a large amount of signaling overhead on the air interface and the backhaul link. Moreover, each interfered base station needs to queue, and the interfering base station needs to perform interference suppression one by one, which will result in excessive latency. Summary of the Invention

[0007] The purpose of the embodiments of the present invention is to provide a method and system for suppressing interference between base stations to solve the technical problems of large signaling overhead on the air interface and / or the backhaul link and large latency during the process of remote interference suppression. The specific technical solutions are as follows:

[0008] To achieve the above object, an embodiment of the present application provides a method for suppressing interference between base stations, the method comprising:

[0009] The cluster head base station of the interfered base station cluster sends auxiliary information and interference reference signals to the interfering base station, and monitors the response signals fed back by the interfering base station; wherein, the base stations within the interfered base station cluster are all subject to remote interference from the interfering base station, and the auxiliary information is determined according to the interference information of each base station within the interfered base station cluster;

[0010] When the interfering base station monitors the interference reference signal, according to the auxiliary information, it performs remote interference suppression on the interfered base station cluster and feeds back a response signal to the cluster head base station;

[0011] When the cluster head base station monitors the response signal, it re-sends the interference reference signal to the interfering base station and returns to the step of monitoring the response signal fed back by the interfering base station until the interfering base station cannot monitor the interference reference signal and / or the cluster head base station cannot monitor the response signal.

[0012] Optionally, the following steps are used to determine the interfered base station cluster and the cluster head base station:

[0013] Determine an initial base station from multiple interfered base stations;

[0014] The initial base station broadcasts the identification information of the interfering base station to the base stations within a preset range and receives the interference feature vectors sent by the target interfered base stations; wherein, the target interfered base stations are the base stations within the preset range that are subject to remote interference from the interfering base station;

[0015] The initial base station calculates the interference similarity according to the geographical distance between itself and the target interfered base stations and the interference feature vectors, and determines the co-cluster base stations from the target interfered base stations according to the magnitude relationship between the interference similarity and a preset similarity threshold;

[0016] The initial base station determines a cluster of affected base stations, where the cluster of affected base stations includes: the initial base station and the base stations in the same cluster, and determines the cluster head base station of the cluster of affected base stations according to a preset cluster head selection rule.

[0017] Optionally, the method further includes:

[0018] The initial base station sends the identification information of the cluster head base station to other base stations in the cluster of affected base stations, so that other base stations in the cluster of affected base stations send interference information to the cluster head base station.

[0019] Optionally, the interference similarity is calculated based on the following formula:

[0020]

[0021]

[0022] where m and n are base station identifiers, S(m,n) represents the interference similarity between base stations m and n, α represents the first weighting factor, β represents the second weighting factor, L m,n represents the Euclidean distance between base stations m and n, P m,n represents the Pearson correlation coefficient of the interference between base stations m and n, C m represents the interference feature vector of base station m, C n represents the interference feature vector of base station n, represents the standard deviation of C m of, represents the standard deviation of C n of, and cov represents the covariance operation.

[0023] Optionally, the interference feature vector is composed of the interference noise level values of each PRB in the uplink subframe of the base station.

[0024] Optionally, the step of determining the cluster head base station of the cluster of affected base stations according to a preset cluster head selection rule includes:

[0025] Taking the base station with the lightest load in the cluster of affected base stations as the cluster head base station;

[0026] Or taking the base station closest to the centroid of the cluster of affected base stations as the cluster head base station;

[0027] Or taking the initial cluster head as the cluster head base station.

[0028] Optionally, the step of performing remote interference suppression on the cluster of affected base stations includes:

[0029] Modifying the special subframe ratio, increasing the guard interval, and / or increasing the antenna downtilt angle.

[0030] Optionally, the disturbed information includes:

[0031] The number of disturbed uplink symbols, the height of the disturbed base station, and the remote interference intensity.

[0032] Optionally, the auxiliary information includes:

[0033] The total number of disturbed base stations in the disturbed base station cluster, the maximum number of disturbed uplink symbols, the maximum distance between the cluster head base station and other base stations in the disturbed base station cluster, the maximum height of the base stations in the disturbed base station cluster, and the range of remote interference intensity.

[0034] To achieve the above object, an embodiment of the present application further provides a system for suppressing interference between base stations. The system includes a cluster head base station of a disturbed base station cluster and a disturbing base station;

[0035] The cluster head base station of the disturbed base station cluster is configured to send auxiliary information and an interference reference signal to the disturbing base station, and monitor a response signal fed back by the disturbing base station; wherein, the base stations in the disturbed base station cluster are all subject to remote interference from the disturbing base station, and the auxiliary information is determined according to the disturbed information of each base station in the disturbed base station cluster;

[0036] The disturbing base station is configured to, when the interference reference signal is monitored, perform remote interference suppression on the disturbed base station cluster according to the auxiliary information, and feed back a response signal to the cluster head base station;

[0037] The cluster head base station of the disturbed base station cluster is further configured to, when the response signal is monitored, re-send the interference reference signal to the disturbing base station, and return to the step of monitoring the response signal fed back by the disturbing base station until the disturbing base station cannot monitor the interference reference signal and / or the cluster head base station cannot monitor the response signal.

[0038] Advantages of the embodiments of the present application:

[0039] Applying the method and system for suppressing interference between base stations provided by the embodiments of the present application, when multiple disturbed base stations are subject to remote interference from the same disturbing base station, the disturbed base stations are clustered, and the disturbed base station cluster and the cluster head base station are determined. The cluster head base station aggregates the disturbed information of all disturbed base stations in the cluster, and generates overall auxiliary information to be sent to the disturbing base station, so that the disturbing base station performs remote interference suppression according to the auxiliary information. There is no need for each disturbed base station to communicate with the disturbing base station separately to achieve interference suppression, thereby saving a large amount of signaling overhead of the air interface and / or the backhaul link. Moreover, since each disturbed base station does not need to queue for the interference mechanism, and the disturbing base station suppresses the remote interference of all base stations in the disturbed base station cluster at one time, the delay of interference suppression can be greatly reduced.

[0040] Of course, it is not necessary for any product or method implementing the present invention to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other embodiments according to these drawings.

[0042] Figure 1 FIG.

[0043] Figure 2 is a schematic flowchart of a method for suppressing interference between base stations provided by an embodiment of the present application;

[0044] Figure 3 FIG. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art based on this application belong to the scope of protection of the present invention.

[0046] Since the existing remote interference suppression framework corresponds to one interfering base station for each victim base station, it is necessary for each victim base station to communicate with the interfering base station separately to achieve interference suppression, which will result in a large amount of signaling overhead on the air interface and / or backhaul link. Moreover, each victim base station needs to queue, and the interfering base station needs to perform interference suppression one by one, which will result in excessive latency.

[0047] In order to solve the technical problems of large signaling overhead on the air interface and / or backhaul link and large latency in the process of remote interference suppression, the embodiments of the present application provide a method and system for suppressing interference between base stations.

[0048] The method and system for suppressing interference between base stations provided by the embodiments of the present application can be applied to the 5G NR TDD scenario.

[0049] See Figure 1 , Figure 1 is a schematic flowchart of a method for suppressing interference between base stations provided by an embodiment of the present application. As Figure 1 described, the method may include the following steps:

[0050] S101: The cluster head base station of the disturbed base station cluster sends auxiliary information and interference reference signals to the interfering base station, and monitors the response signals fed back by the interfering base station; wherein, the base stations within the disturbed base station cluster are all subject to the remote interference of the interfering base station, and the auxiliary information is determined according to the interference information of each base station within the disturbed base station cluster.

[0051] When an atmospheric duct exists, the downlink signals of a base station may interfere with the uplink signals of multiple base stations several kilometers to hundreds of kilometers away. In the embodiments of the present application, the base station that generates interference is referred to as the interfering base station, and the base station that is interfered with is referred to as the disturbed base station.

[0052] In the embodiments of the present application, the method for the disturbed base station to detect remote interference can refer to the related art, including but not limited to the following methods:

[0053] 1) The interfering base station sends a characteristic sequence in the downlink pilot time slot DwPTS. If the disturbed base station detects the characteristic sequence in the uplink pilot time slot UpPTS or the uplink subframe, it can determine the occurrence of remote interference.

[0054] 2) The disturbed base station detects whether the average interference noise on each PRB of the uplink subframe exceeds a preset threshold. If it exceeds, it can determine the occurrence of remote interference.

[0055] 3) Determine whether remote interference occurs according to the ramp characteristic of the remote interference. Since the ramp characteristic will be generated when remote interference occurs, the occurrence of remote interference can be determined by detecting the ramp characteristic.

[0056] In the embodiments of the present application, after the disturbed base station detects remote interference, it performs clustering to determine the disturbed base station cluster, and each base station within the disturbed base station cluster is subject to the remote interference of the same interfering base station.

[0057] Moreover, a cluster head base station is determined from the disturbed base station cluster, and the cluster head base station communicates with the interfering base station to achieve interference suppression.

[0058] Specifically, each base station within the disturbed base station cluster sends its own interference information to the cluster head base station. The cluster head base station determines the auxiliary information according to the interference information of each base station within the disturbed base station cluster, and the auxiliary information is used as the reference data for the interfering base station to perform remote interference suppression.

[0059] In an embodiment of the present application, the interference information may include: the number of disturbed uplink symbols, the height of the disturbed base station, and the remote interference intensity. Among them, the remote interference intensity can be measured according to the energy of the received characteristic sequence or the interference noise level value of each PRB (physical resource block) in the uplink subframe.

[0060] The auxiliary information may include: the total number of interfered base stations in the interfered base station cluster, the maximum number of interfered uplink symbols, the maximum distance between the cluster head base station and other base stations in the interfered base station cluster, the maximum height of the base stations in the interfered base station cluster, and the range of remote interference intensity.

[0061] Specifically, the cluster head base station of the interfered base station cluster sends the auxiliary information and the interference reference signal to the interfering base station. The full name of the interference reference signal is: Remote Interference Management-reference signal (RIM-RS). This signal is sent by the interfered base station and can be denoted as RIM-RS#1.

[0062] S102: When the interfering base station detects the interference reference signal, according to the auxiliary information, it performs remote interference suppression for the interfered base station cluster and feeds back a response signal to the cluster head base station.

[0063] In the embodiment of the present application, when the interfering base station detects the interference reference signal, it can execute the remote interference execution strategy for the interfered base station cluster according to the auxiliary information, that is, suppress the remote interference received by all base stations in the interfered base station cluster.

[0064] In an embodiment of the present application, the specific means of remote interference suppression include but are not limited to: modifying the special subframe ratio, increasing the guard interval, increasing the antenna downtilt angle, etc.

[0065] After the interfering base station performs remote interference suppression, it feeds back a response signal to the cluster head base station. Specifically, it can feed back by sending RIM-RS#2 through the air interface, or inform the cluster head base station through the backhaul link that RIM-RS#1 has been detected.

[0066] S103: When the cluster head base station detects the response signal, it resends the interference reference signal to the interfering base station and returns to the step of monitoring the response signal fed back by the interfering base station until the interfering base station can no longer detect the interference reference signal and / or the cluster head base station can no longer detect the response signal.

[0067] If the cluster head base station detects RIM-RS#2 on the air interface or is informed through the backhaul link that the interfering base station has detected RIM-RS#1, it means that the cluster head base station has detected the response signal. At this time, the cluster head base station continues to send the interference reference signal, that is, RIM-RS#1, and returns to the step of monitoring the response signal fed back by the interfering base station in step S101.

[0068] When the interfering base station detects the interference reference signal, it continues to perform remote interference suppression and feeds back a response signal to the cluster head base station.

[0069] In an embodiment of the present application, if the cluster head base station fails to detect RIM-RS#2 on the air interface within a certain period of time, or the cluster head base station is informed on the backhaul link that the interfering base station has not detected RIM-RS#1, it can be understood that the cluster head base station fails to detect the response signal, then the transmission of RIM-RS#1 is stopped, and the monitoring of RIM-RS#2 is stopped; if the interfering base station fails to detect RIM-RS#1 within a certain period of time, the monitoring of RIM-RS#1 is stopped and the transmission of RIM-RS#2 is stopped.

[0070] Those skilled in the art can understand that when the interfering base station fails to detect the interference reference signal and / or the cluster head base station fails to detect the response signal, it can be considered that the remote interference suppression has been completed and the expected effect has been achieved. Therefore, the monitoring and transmission of the reference signal are stopped, thereby stopping the remote interference suppression.

[0071] Applying the method for suppressing interference between base stations provided by the embodiment of the present application, when multiple victim base stations are subjected to remote interference from the same interfering base station, the victim base stations are clustered, and the victim base station cluster and the cluster head base station are determined. The cluster head base station summarizes the interference information of all victim base stations in the cluster and generates overall auxiliary information to be sent to the interfering base station, so that the interfering base station performs remote interference suppression according to the auxiliary information. There is no need for each victim base station to communicate with the interfering base station separately to achieve interference suppression, thereby saving a large amount of signaling overhead on the air interface and / or the backhaul link. Moreover, since each victim base station does not need to queue for the interference mechanism and the interfering base station suppresses the remote interference of all base stations in the victim base station cluster at one time, the delay of interference suppression can be significantly reduced.

[0072] See Figure 2 , Figure 2 is a schematic flowchart of a process for determining a victim base station cluster provided by an embodiment of the present application. As Figure 2 shown, the method may include the following steps:

[0073] S201: Determine an initial base station from multiple victim base stations.

[0074] First, a base station can be randomly selected from the victim base stations as the initial base station.

[0075] S202: The initial base station broadcasts the identification information of the interfering base station to the base stations within a preset range and receives the interference feature vectors sent by the target victim base stations; wherein, the target victim base stations are the base stations within the preset range that are subjected to the remote interference of the interfering base station.

[0076] In an embodiment of the present application, the circular range area with the initial base station as the center and R as the radius can be recorded as the preset range, and R is the preset radius.

[0077] The initial base station broadcasts to all base stations within a preset range through the X2 / Xn interface. The content of the broadcast signaling includes the identification information of the interfering base station detected by the initial base station, and the identification information can be the physical cell identifier PCI0.

[0078] The base stations within the preset range that receive the broadcast signaling can determine whether they are affected by remote interference. If they are affected by remote interference, they can determine whether the physical cell identifier of the detected interfering base station is the same as that in the broadcast signaling. If they are the same, they can send the interference feature vector to the initial base station through the X2 / Xn interface.

[0079] Thus, the initial base station can receive the interference feature vectors sent by multiple target interfered base stations. The remote interference received by the target interfered base stations and the remote interference received by the initial base station come from the same interfering base station.

[0080] In an embodiment of the present application, the interference feature vector can be composed of the interference noise level values of each PRB in the uplink subframe of the base station.

[0081] S203: The initial base station calculates the interference similarity according to the geographical distance between itself and the target interfered base stations, and the interference feature vector, and determines the co-cluster base stations from the target interfered base stations according to the size relationship between the interference similarity and the preset similarity threshold.

[0082] The initial base station can determine the final interference similarity according to two factors: geographical distance and interference coefficient.

[0083] Specifically, the interference similarity can be calculated based on the following formula:

[0084]

[0085]

[0086] where m and n are base station identifiers, S(m,n) represents the interference similarity between base station m and base station n, α represents the first weighting factor, β represents the second weighting factor, L m,n represents the Euclidean distance between base station m and base station n, P m,n represents the Pearson correlation coefficient of the interference between base station m and base station n, C m represents the interference feature vector of base station m, C n represents the interference feature vector of base station n, represents the standard deviation of C m , represents the standard deviation of C n , and cov represents the covariance operation.

[0087] If the interference similarity between the initial base station and the target disturbed base station is greater than a preset similarity threshold, the target disturbed base station is determined as a co-cluster base station.

[0088] S204: The initial base station determines a cluster of disturbed base stations, which includes the initial base station and co-cluster base stations, and determines the cluster head base station of the cluster of disturbed base stations according to a preset cluster head selection rule.

[0089] After traversing all the base stations within a preset range, the cluster of disturbed base stations can be determined, which includes the initial base station and the co-cluster base stations determined in the above manner.

[0090] Subsequently, the initial base station can determine the cluster head base station of the cluster of disturbed base stations according to a preset cluster head selection rule.

[0091] In an embodiment of the present application, the selection criteria for the cluster head base station include but are not limited to: using the base station with the lightest load in the cluster of disturbed base stations as the cluster head base station, using the base station closest to the centroid of the cluster of disturbed base stations as the cluster head base station, and using the initial cluster head as the cluster head base station.

[0092] In an embodiment of the present application, after determining the cluster head base station, the initial base station sends the identification information of the cluster head base station to other base stations in the cluster of disturbed base stations, so that other base stations in the cluster of disturbed base stations can send interference information to the cluster head base station. Subsequently, the cluster head base station can summarize the interference information and generate auxiliary information. The identification information of the cluster head base station can be the physical cell identifier of the cluster head base station.

[0093] See Figure 3 , Figure 3 which is a schematic structural diagram of a system for suppressing interference between base stations provided by an embodiment of the present application. As Figure 3 shown, the system includes the cluster head base station of the cluster of disturbed base stations and the interfering base station.

[0094] As Figure 3 shown, the cluster head base station of the cluster of disturbed base stations receives the disturbed information sent by other base stations in the cluster of disturbed base stations and generates auxiliary information. The cluster head base station sends the auxiliary information and the interference reference signal to the interfering base station and monitors the response signal fed back by the interfering base station.

[0095] After detecting the interference reference signal, the interfering base station performs remote interference suppression on the cluster of disturbed base stations according to the auxiliary information and feeds back a response signal to the cluster head base station;

[0096] After detecting the response signal, the cluster head base station of the cluster of disturbed base stations resends the interference reference signal to the interfering base station and continues to monitor the response signal fed back by the interfering base station until the interfering base station can no longer detect the interference reference signal and / or the cluster head base station can no longer detect the response signal.

[0097] Applying the interference suppression system between base stations provided by the embodiments of the present application, when multiple victim base stations are subject to remote interference from the same interfering base station, clustering of the victim base stations is performed to determine the victim base station clusters and the cluster head base stations. The cluster head base station aggregates the interference information of all victim base stations within the cluster and generates overall auxiliary information to be sent to the interfering base station, so that the interfering base station performs remote interference suppression according to the auxiliary information. There is no need for each victim base station to communicate with the interfering base station separately to achieve interference suppression, thus saving a large amount of signaling overhead of the air interface and / or the backhaul link. Moreover, since each victim base station does not need to queue for the interference mechanism and the interfering base station suppresses the remote interference of all base stations within the victim base station cluster at one time, the delay of interference suppression can be significantly reduced.

[0098] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more integrated available media. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

[0099] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0100] Each embodiment in this specification is described in a related manner. For the same or similar parts among the embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the embodiment of the system for suppressing interference between base stations, since it is basically similar to the embodiment of the method for suppressing interference between base stations, the description is relatively simple. For the relevant parts, reference can be made to the partial description of the embodiment of the method for suppressing interference between base stations.

[0101] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are all included in the protection scope of the present invention.

Claims

1. A method for suppressing interference between base stations, characterized in that The method includes: The cluster head base station of the disturbed base station cluster sends auxiliary information and interference reference signals to the interfering base station, and monitors the response signals fed back by the interfering base station; wherein, the base stations within the disturbed base station cluster are all subject to the remote interference of the interfering base station, and the auxiliary information is determined according to the interference information of each base station within the disturbed base station cluster; When the interfering base station detects the interference reference signal, it performs remote interference suppression for the disturbed base station cluster according to the auxiliary information, and feeds back a response signal to the cluster head base station; When the cluster head base station detects the response signal, it resends the interference reference signal to the interfering base station, and returns to the step of monitoring the response signal fed back by the interfering base station until the interfering base station can no longer detect the interference reference signal and / or the cluster head base station can no longer detect the response signal; Among them, the following steps are used to determine the disturbed base station cluster and the cluster head base station: Determine an initial base station from multiple disturbed base stations; The initial base station broadcasts the identification information of the interfering base station to the base stations within a preset range, and receives the interference feature vectors sent by the target disturbed base stations; wherein, the target disturbed base stations are the base stations within the preset range that are subject to the remote interference of the interfering base station; The initial base station calculates the interference similarity according to the geographical distance between itself and the target disturbed base stations, as well as the interference feature vectors, and determines the co-cluster base stations from the target disturbed base stations according to the magnitude relationship between the interference similarity and the preset similarity threshold; The initial base station determines the disturbed base station cluster, which includes: the initial base station and the co-cluster base stations, and determines the cluster head base station of the disturbed base station cluster according to the preset cluster head selection rule.

2. The method according to claim 1, wherein The method further includes: The initial base station sends the identification information of the cluster head base station to the other base stations in the disturbed base station cluster, so that the other base stations in the disturbed base station cluster send the interference information to the cluster head base station.

3. The method according to claim 1, wherein Calculate the interference similarity based on the following formula: Among them, m and n are base station identifiers, S(m,n) represents the interference similarity between base station m and base station n, α represents the first weighting factor, β represents the second weighting factor, L m,n represents the Euclidean distance between base station m and base station n, P m,n represents the Pearson correlation coefficient of the interference between base station m and base station n, C m represents the interference feature vector of base station m, C n represents the interference feature vector of base station n, represents the standard deviation of C m of, represents the standard deviation of C n of, and cov represents the covariance operation.

4. The method according to claim 1, characterized in that, The interference feature vector is composed of the interference noise level values of each physical resource block (PRB) in the uplink subframe of the base station.

5. The method according to claim 1, wherein The step of determining the cluster head base station of the disturbed base station cluster according to the preset cluster head selection rule includes: Taking the base station with the lightest load in the disturbed base station cluster as the cluster head base station; Or taking the base station closest to the centroid of the disturbed base station cluster as the cluster head base station; Or taking the initial cluster head as the cluster head base station.

6. The method according to claim 1, characterized in that, The step of performing remote interference suppression for the disturbed base station cluster includes: Modifying the special subframe ratio, increasing the guard interval and / or increasing the antenna downtilt angle.

7. The method according to claim 1, wherein The interference information includes: The number of disturbed uplink symbols, the height of the disturbed base station, and the remote interference intensity.

8. The method according to claim 1, wherein The auxiliary information includes: The total number of disturbed base stations in the disturbed base station cluster, the maximum number of disturbed uplink symbols, the maximum distance between the cluster head base station and other base stations in the disturbed base station cluster, the maximum height of the base stations in the disturbed base station cluster, and the range of remote interference intensity.

9. A system for suppressing interference between base stations, characterized in that, The system includes a cluster head base station and a jamming base station of a cluster of disturbed base stations; wherein, the following steps are used to determine the cluster of disturbed base stations and the cluster head base station: An initial base station is determined from multiple disturbed base stations; the initial base station broadcasts the identification information of the jamming base station to base stations within a preset range, and receives interference feature vectors sent by target disturbed base stations; wherein, the target disturbed base stations are base stations within the preset range that are remotely disturbed by the jamming base station; the initial base station calculates interference similarity according to the geographical distance between itself and the target disturbed base stations, and the interference feature vectors, and determines co-cluster base stations from the target disturbed base stations according to the magnitude relationship between the interference similarity and a preset similarity threshold; the initial base station determines the cluster of disturbed base stations, the cluster of disturbed base stations includes: the initial base station and the co-cluster base stations, and determines the cluster head base station of the cluster of disturbed base stations according to a preset cluster head selection rule; The cluster head base station of the cluster of disturbed base stations is used to send auxiliary information and interference reference signals to the jamming base station, and monitor response signals fed back by the jamming base station; wherein, base stations within the cluster of disturbed base stations are all remotely disturbed by the jamming base station, and the auxiliary information is determined according to the disturbance information of each base station within the cluster of disturbed base stations; The jamming base station is used to, when the interference reference signal is monitored, perform remote interference suppression on the cluster of disturbed base stations according to the auxiliary information, and feed back a response signal to the cluster head base station; The cluster head base station of the cluster of disturbed base stations is further used to, when the response signal is monitored, re-send the interference reference signal to the jamming base station, and return to the step of monitoring the response signal fed back by the jamming base station until the jamming base station cannot monitor the interference reference signal and / or the cluster head base station cannot monitor the response signal.

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