CN104735789B - A kind of inter-cell interference cancellation method, apparatus and system - Google Patents

Abstract

The invention discloses a method, device and system for inter-cell interference elimination. The method includes: a first base station sends a downlink reference signal, so that a second base station performs channel estimation according to the signal and obtains corresponding channel information; Feedback the channel information, allocate scheduling resources for the downlink scheduling users according to the channel information, and send data to the downlink scheduling users through the scheduling resources, the channel information includes the transmitting antenna of the first base station and the receiving antenna of the second base station channel information. In this solution, when estimating the downlink channel, the channel between the receiving antenna of the base station and the transmitting antenna of the adjacent base station can be measured and fed back to the adjacent base station, so that the adjacent base station can allocate downlink scheduling resources In this case, the downlink transmission of the current cell and the impact of the downlink transmission on the uplink reception of adjacent cells can be considered comprehensively, so as to achieve the purpose of eliminating inter-cell interference to a greater extent and improve system performance.

Description

Inter-cell interference cancellation method, device and system

technical field

The present invention relates to the technical field of wireless communication, and in particular to an inter-cell interference elimination method, device and system based on a simultaneous co-frequency full duplex (CCFD, Co-frequency Co-time Full Duplex) wireless communication system.

Background technique

At present, according to different duplex communication modes, wireless communication systems can be mainly divided into two categories: Time Division Duplex (TDD, Time Division Duplex) systems and Frequency Division Duplex (FDD, Frequency Division Duplex) systems. Wherein, the time division duplex system can use the same frequency and different time slots to transmit data, and the frequency division duplex system can use the same time slot and different frequencies to transmit data, so as to achieve isolation between the uplink and downlink respectively purpose of interference. However, in the above two duplex systems, time resources and frequency resources are respectively sacrificed in the process of isolating uplink and downlink, so there will be a problem of relatively low spectrum utilization.

In view of the above problems, the industry has proposed a simultaneous and same-frequency full-duplex communication system that can be used to improve spectrum resource utilization. In the simultaneous and same-frequency full-duplex communication system, the communication parties can respectively be equipped with a pair of transmitting antennas and receiving antennas, so as to simultaneously transmit downlink data and receive uplink data on the same frequency and time unit. Specifically, under ideal conditions, compared with the existing time-division duplex system and frequency-division duplex system, the simultaneous and same-frequency full-duplex communication system can increase the spectral efficiency by about two times.

However, as shown in Figure 1 (Figure 1 is a schematic diagram of interference signals between simultaneous and same-frequency full-duplex communication systems), due to the simultaneous and same-frequency full-duplex communication system, the interference between systems (assuming that the base station end transceiver antenna In addition to the interference caused by the downlink transmission of the base station to the downlink receiving user of the adjacent base station and the interference caused by the uplink transmission of the user to the uplink reception of the adjacent base station, it can also include the downlink transmission antenna of the base station. The interference caused by the uplink receiving antennas of adjacent base stations, etc., and the prior art only provides solutions for solving the self-interference problem inside the base station in the simultaneous same-frequency full-duplex communication system or for solving the problem between the base station and the user in the same cell Therefore, if the inter-cell interference elimination scheme described in the prior art is still used to eliminate inter-cell interference for the simultaneous co-frequency full-duplex communication system, there will be poor interference elimination effect , The problem that causes the system communication performance to degrade.

Contents of the invention

Embodiments of the present invention provide a method, device and system for eliminating inter-cell interference, so as to solve the problem of low system communication performance caused by poor inter-cell interference elimination effect in existing simultaneous and same-frequency full-duplex communication systems.

An embodiment of the present invention provides a method for eliminating interference between cells, and the method is applicable to a simultaneous and same-frequency full-duplex communication system, including:

The first base station sends a downlink reference signal, so that a second base station adjacent to the first base station performs channel estimation and acquires corresponding channel information according to the downlink reference signal;

receiving the channel information fed back by the second base station, and allocating corresponding scheduling resources for downlink scheduling users according to the channel information, and sending data to the downlink scheduling users through the allocated scheduling resources, wherein, The channel information includes channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station.

Wherein, the downlink reference signal is orthogonal to the uplink reference signal of each serving cell of the first base station and the uplink reference signal of each serving cell of the second base station; or,

On resources used by the downlink reference signal, each serving cell of the first base station and each serving cell of the second base station transmit uplink data in a silent manner.

Further, when the first base station is not provided with an interference cancellation circuit for canceling the interference signal between the transmitting antenna of the first base station and the receiving antenna of the first base station, the downlink reference signal It is also orthogonal to the signal sent by the first base station for self-interference channel measurement.

Further, the method also includes:

If, according to the channel information fed back by the second base station, it is determined that the interference channel power between the first base station and the second base station is greater than a set threshold, allocating dedicated channel measurement resources for the second base station, and sending the downlink reference signal on the dedicated channel measurement resource.

Wherein, on the dedicated channel measurement resources, each serving cell of the first base station and each serving cell of the second base station do not send uplink signals and downlink signals.

Further, before sending data to the downlink scheduling user through the allocated scheduling resources, the method further includes:

Precoding the data of the downlink scheduled user according to the channel information fed back by the second base station;

Sending data to the downlink scheduling user through the allocated scheduling resources, including:

The precoded downlink scheduled user data is sent through the allocated scheduling resources.

The embodiment of the present invention also provides a method for eliminating interference between cells, and the method is applicable to a simultaneous and same-frequency full-duplex communication system, including:

The second base station receives a downlink reference signal sent by a first base station adjacent to the second base station, and performs channel estimation according to the downlink reference signal to obtain corresponding channel information, wherein the obtained channel information includes the channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station;

feeding back the obtained channel information to the first base station, so that the first base station allocates corresponding scheduling resources for downlink scheduling users according to the obtained channel information and uses the allocated scheduling resources to Downlink scheduling users to send data.

Wherein, the downlink reference signal is orthogonal to the uplink reference signal of each serving cell of the first base station and the uplink reference signal of each serving cell of the second base station; or,

On resources used by the downlink reference signal, each serving cell of the first base station and each serving cell of the second base station transmit uplink data in a silent manner.

Further, when the first base station is not provided with an interference cancellation circuit for canceling the interference signal between the transmitting antenna of the first base station and the receiving antenna of the first base station, the downlink reference signal It is also orthogonal to the signal sent by the first base station for self-interference channel measurement.

Further, the method also includes:

If it is determined according to the obtained channel information that the interference channel power between the first base station and the second base station is greater than a set threshold, instruct the first base station to allocate a dedicated channel measurement for the second base station resources and transmit the downlink reference signal on the dedicated channel measurement resources.

Wherein, on the dedicated channel measurement resources, each serving cell of the first base station and each serving cell of the second base station do not send uplink signals and downlink signals.

Further, the obtained channel information is fed back to the first base station, so that the first base station allocates corresponding scheduling resources for downlink scheduling users according to the obtained channel information and uses the allocated scheduling resources Sending data to the downlink scheduling user includes:

feeding back the obtained channel information to the first base station, so that the first base station allocates corresponding scheduling resources for the downlink scheduling users according to the obtained channel information, and allocates the data of the downlink scheduling users Precoding is performed, and the precoded downlink scheduled user data is sent through the allocated scheduling resources.

Correspondingly, an embodiment of the present invention provides a base station, which is suitable for simultaneous and same-frequency full-duplex communication systems, including:

a reference signal sending unit, configured to send a downlink reference signal, so that adjacent base stations of the base station perform channel estimation and acquire corresponding channel information according to the downlink reference signal;

a channel information receiving unit, configured to receive the channel information fed back by the neighboring base station;

a downlink data sending unit, configured to allocate corresponding scheduling resources for downlink scheduling users according to the channel information received by the channel information receiving unit, and send data to the downlink scheduling users through the allocated scheduling resources, wherein , the channel information includes channel information between the transmitting antenna of the base station and the receiving antenna of the adjacent base station.

Wherein, the downlink reference signal is orthogonal to the uplink reference signal of each serving cell of the base station and the uplink reference signal of each serving cell of the adjacent base station; or,

On resources used by the downlink reference signal, each serving cell of the base station and each serving cell of the adjacent base station transmits uplink data in a silent manner.

Further, when the base station is not provided with an interference cancellation circuit for canceling the interference signal between the transmitting antenna of the base station and the receiving antenna of the base station, the downlink reference signal is also transmitted with the base station The signals used for self-interfering channel measurements are orthogonal.

Further, the base station also includes a dedicated resource allocation unit:

The dedicated resource allocation unit is configured to, if it is determined according to the channel information fed back by the adjacent base station that the power of the interference channel between the base station and the adjacent base station is greater than a set threshold, then the adjacent base station The base station allocates dedicated channel measurement resources;

The reference signal sending unit is specifically configured to send the downlink reference signal on the dedicated channel measurement resource.

Wherein, on the dedicated channel measurement resources, each serving cell of the base station and each serving cell of the neighboring base station do not send uplink signals and downlink signals.

Further, the base station also includes a data precoding unit:

The data precoding unit is configured to perform data precoding on the downlink scheduling user according to the channel information fed back by the adjacent base station before sending data to the downlink scheduling user through the allocated scheduling resources precoding;

The downlink data sending unit is specifically configured to send the precoded downlink scheduling user data through the allocated scheduling resources.

The embodiment of the present invention also provides a base station. The base station is suitable for simultaneous and same-frequency full-duplex communication systems, including:

a reference signal receiving unit, configured to receive a downlink reference signal sent by a neighboring base station of the base station;

a channel information obtaining unit, configured to perform channel estimation according to the downlink reference signal received by the reference signal receiving unit to obtain corresponding channel information, wherein the obtained channel information includes the transmission antenna and channel information between receive antennas of the station;

a channel information feedback unit, configured to feed back the obtained channel information to the adjacent base station, so that the adjacent base station allocates corresponding scheduling resources for downlink scheduling users according to the obtained channel information and passes the obtained The allocated scheduling resources send data to the downlink scheduling users.

Wherein, the downlink reference signal is orthogonal to the uplink reference signal of each serving cell of the adjacent base station and the uplink reference signal of each serving cell of the base station; or,

On the resources used by the downlink reference signal, each serving cell of the adjacent base station and each serving cell of the base station transmit uplink data in a silent manner.

Further, when the adjacent base station is not provided with an interference cancellation circuit for canceling the interference signal between the transmitting antenna of the adjacent base station and the receiving antenna of the adjacent base station, the downlink reference signal It is also orthogonal to the signal sent by the adjacent base station for self-interference channel measurement.

Further, the base station also includes a dedicated resource indication unit:

The dedicated resource indicating unit is configured to, if it is determined according to the acquired channel information that the interference channel power between the adjacent base station and the base station is greater than a set threshold, indicate that the adjacent base station is the The base station allocates dedicated channel measurement resources and sends the downlink reference signal on the dedicated channel measurement resources.

Wherein, on the dedicated channel measurement resources, each serving cell of the adjacent base station and each serving cell of the base station do not send uplink signals and downlink signals.

Further, the channel information feedback unit is specifically configured to feed back the obtained channel information to the neighboring base station, so that the neighboring base station allocates corresponding downlink scheduling users according to the obtained channel information. The scheduling resource is used, and the data of the downlink scheduling user is precoded, and the precoded downlink scheduling user data is sent through the allocated scheduling resource.

Correspondingly, an embodiment of the present invention also provides an inter-cell interference cancellation system, the system is suitable for simultaneous and same-frequency full-duplex communication systems, including at least one first base station and at least one second base station, wherein:

The first base station is configured to send a downlink reference signal, receive channel information fed back by the second base station, and allocate corresponding scheduling resources for downlink scheduling users according to the channel information, and use the allocated scheduling resources to The downlink scheduling user performs data transmission, wherein the channel information includes channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station;

The second base station is configured to receive the downlink reference signal sent by the first base station, perform channel estimation according to the downlink reference signal to obtain corresponding channel information, and feed back the obtained channel information to the first base station.

The beneficial effects of the present invention are as follows:

Embodiments of the present invention provide a method, device, and system for eliminating inter-cell interference. The method includes: the first base station sends a downlink reference signal, so that the adjacent second base station performs channel estimation and obtains the channel according to the downlink reference signal. Corresponding channel information: receiving the channel information fed back by the second base station, and allocating scheduling resources for the downlink scheduling users according to the channel information, and sending data to the downlink scheduling users through the allocated scheduling resources, wherein , the acquired channel information includes channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station. In the technical solution described in the embodiment of the present invention, when estimating the downlink channel, the channel between the receiving antenna of the base station and the transmitting antenna of the adjacent base station can be measured and fed back to the adjacent base station, so that the adjacent base station can When allocating downlink scheduling resources, the downlink transmission of this cell and the impact of downlink transmission on the uplink reception of adjacent cells can be considered comprehensively, so as to achieve the purpose of eliminating inter-cell interference in the simultaneous same-frequency full-duplex communication system to a large extent, and improve System performance of simultaneous co-frequency full-duplex communication systems.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Figure 1 is a schematic diagram of interference signals between simultaneous and same-frequency full-duplex communication systems;

FIG. 2 is a schematic flowchart of the inter-cell interference elimination method described in Embodiment 1 of the present invention;

FIG. 3 is a schematic flowchart of the inter-cell interference elimination method described in Embodiment 2 of the present invention;

FIG. 4 is a schematic flowchart of the inter-cell interference elimination method described in Embodiment 3 of the present invention;

FIG. 5 is a schematic structural diagram of the base station described in Embodiment 4 of the present invention;

FIG. 6 is a schematic structural diagram of the base station described in Embodiment 5 of the present invention;

FIG. 7 is a schematic structural diagram of the inter-cell interference cancellation system described in Embodiment 6 of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment one:

As shown in FIG. 2 , it is a schematic flowchart of the method for eliminating inter-cell interference in Embodiment 1 of the present invention, and the method for eliminating inter-cell interference is applicable to a simultaneous and same-frequency full-duplex communication system. Specifically, the inter-cell interference cancellation method may include the following steps:

Step 101: The first base station sends a downlink reference signal, so that a second base station adjacent to the first base station performs channel estimation and obtains corresponding channel information according to the downlink reference signal, wherein the obtained channel information includes Channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station.

Specifically, in a simultaneous and same-frequency full-duplex communication system, the channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station can be at least compatible with the transmitting antenna of the first base station and the Interference signals between receiving antennas of the second base station are correlated, which is not limited in this embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, the channel information acquired by the second base station according to the downlink reference signal may not only include the transmitting antenna of the first base station and the receiving channel information of the second base station In addition to the channel information between antennas, it may also generally include channel information between the base station and users, such as channel information between users in the cells of the first base station and the second base station. This does not make any restrictions.

It should be noted that the channel information obtained by the second base station according to the downlink reference signal can usually be information such as CQI (Channel Quality Indication, Channel Quality Indication) parameters used to measure the quality of the channel. The present invention The embodiment also does not make any limitation on this.

Further, in the embodiment of the present invention, in order to improve the accuracy of channel information measurement, when the first base station sends the downlink reference signal, it may perform corresponding processing on the downlink reference signal so that it satisfies The following conditions:

The downlink reference signals are respectively orthogonal to the uplink reference signals of the serving cells of the first base station and the uplink reference signals of the serving cells of the second base station, wherein the orthogonal resources may be time domain, frequency Domain or code channel, etc., which are not limited in this embodiment of the present invention; or,

On the resources used by the downlink reference signal, each serving cell of the first base station and each serving cell of the second base station transmit uplink data in a mute (Mute) manner, wherein the downlink reference The resources used by the signal can be uniformly delivered to each base station in the system by a central controller, such as a base station controller (BSC), which will not be described in detail in this embodiment of the present invention.

Further, for each base station in the simultaneous same-frequency full-duplex communication system, the measurement of the self-interference channel between the transmitting antenna and the receiving antenna requires the adjustment of the transmitting power, because the excessive transmitting power will saturate the receiving circuit , causing the base station to fail to work normally, therefore, the reference signal used for the measurement of the interference channel between the base stations cannot be used for the measurement of the self-interference channel. That is to say, when the first base station is not provided with an interference canceling circuit for canceling the interference signal between the transmitting antenna of the first base station and the receiving antenna of the first base station (i.e., the transmitting and receiving antenna at the base station When there is no good isolation between them), the downlink reference signal is also orthogonal to the signal sent by the first base station for self-interference channel measurement, so as to ensure the accuracy of channel information measurement.

Step 102: Receive the channel information fed back by the second base station, and allocate corresponding scheduling resources for the downlink scheduling users according to the channel information fed back by the second base station, and use the allocated scheduling resources for the downlink scheduling users sending of data.

Wherein, the channel information fed back by the second base station is obtained when the second base station performs channel estimation according to the downlink reference signal, including the transmitting antenna of the first base station and the second base station The channel information of the channel information between the receiving antennas is not described in this embodiment of the present invention.

Further, allocating corresponding scheduling resources for downlink scheduling users according to the channel information fed back by the second base station may generally be to determine available resources that have relatively low interference to the second base station according to the channel information fed back by the second base station. small scheduling resources, and select corresponding scheduling resources from the available scheduling resources that have relatively little interference to the second base station to allocate to the downlink scheduling user, so as to reduce the impact on the second base station receiving antenna or The purpose of the interference of the users of the cells of the second base station is to improve the effect of inter-cell interference cancellation.

Further, in the embodiment of the present invention, before sending data to the downlink scheduling user through the allocated scheduling resources, the method may further include:

Precoding the data of the downlink scheduled user according to the channel information fed back by the second base station. Specifically, in the embodiment of the present invention, the Beamforming algorithm that forms a "null trap" for adjacent base stations can be used to precode the data of the downlink scheduling user, and then use the allocated scheduling resources to The precoded downlink scheduling user data is sent to achieve the purpose of reducing the interference of the current cell to the uplink users of adjacent cells while ensuring the transmission of downlink services.

Further, in order to further improve the accuracy of channel information measurement results, in the embodiment of the present invention, the method may further include:

According to the channel information fed back by the second base station, determine whether the interference channel power between the first base station and the second base station is greater than a set threshold, and if so, allocate dedicated channel measurement resources for the second base station , and send the downlink reference signal on the dedicated channel measurement resource.

Specifically, in the embodiments of the present invention, each base station (the first base station or the second base station) can judge whether the downlink transmission of the adjacent base station is harmful to itself according to the average power of the interference channel of the adjacent base station measured within the set time period. If it is found that the adjacent base station has caused serious interference to the base station (for example, the average power of the adjacent base station interference channel measured within the set time period is greater than the set threshold), you can use the allocation of dedicated channel measurement resources (including resources such as time domain, frequency domain or code channel), and perform more accurate channel estimation by sending or receiving downlink reference signals through the dedicated channel measurement resources, so as to improve the accuracy of channel information measurement results.

Further, in the embodiment of the present invention, on the dedicated channel measurement resources, the serving cells of the first base station and the serving cells of the second base station usually do not send uplink signals and downlink signals , so as to improve the accuracy of channel information measurement results.

In addition, it should be noted that since channel measurement resources are not fixed, but will change with the change of channel conditions between base stations, in the embodiment of the present invention, the dedicated channels allocated for each base station The measurement resource also needs to be adjusted and changed according to the change of the channel condition between the base stations, which is not described in this embodiment of the present invention.

It should be noted that, in the embodiments of the present invention, on the inter-base station dedicated channel measurement resources, the channel information obtained through the downlink reference signal can be fed back through the X2 interface, wireless Backhaul, or through the respective optical fibers of the base stations. to the central controller, and then the central controller uniformly distributes the channel information, which will not be described in this embodiment of the present invention.

Embodiment 1 of the present invention provides an inter-cell interference elimination method applicable to simultaneous and same-frequency full-duplex communication systems, because when sending data to downlink scheduling users, the base station transmitting antenna that can receive feedback from adjacent base stations and Adjacent base stations receive channel information between antennas and allocate downlink scheduling resources according to the channel information, which can comprehensively consider the downlink transmission of the current cell and the impact of downlink transmission on the uplink reception of adjacent cells, so as to achieve a greater degree The purpose of effectively eliminating the inter-cell interference of the simultaneous and same-frequency full-duplex communication system is to improve the system performance of the simultaneous and same-frequency full-duplex communication system.

Embodiment two:

The second embodiment of the present invention takes the second base station as an example to further describe the inter-cell interference cancellation method in the first embodiment of the present invention. As shown in FIG. 3 , it is a schematic flowchart of the method for eliminating inter-cell interference in Embodiment 2 of the present invention. The method for eliminating inter-cell interference may include the following steps:

Step 201: The second base station receives a downlink reference signal sent by a first base station adjacent to the second base station, and performs channel estimation according to the downlink reference signal to obtain corresponding channel information, wherein the obtained channel information It includes channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station.

Specifically, in a simultaneous and same-frequency full-duplex communication system, the channel information between the transmitting and receiving antenna of the first base station and the transmitting and receiving antenna of the second base station can be at least compatible with the transmitting antenna of the first base station and the Interference signals between receiving antennas of the second base station are correlated, which is not limited in this embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, the channel information acquired by the second base station when performing channel estimation according to the downlink reference signal may include the transmitting antenna of the first base station and the second In addition to the channel information between the receiving antennas of the two base stations, it may also generally include channel information between the base station and users, such as channel information between users in the cells of the first base station and the second base station. The embodiment of the invention does not make any limitation on this.

It should be noted that the channel information obtained by the second base station according to the downlink reference signal can usually be information such as CQI parameters used to measure the quality of the channel, which is not limited in this embodiment of the present invention.

Further, in the embodiments of the present invention, in order to improve the accuracy of channel information measurement, the downlink reference signal generally needs to meet the following conditions:

The downlink reference signals are respectively orthogonal to the uplink reference signals of the serving cells of the first base station and the uplink reference signals of the serving cells of the second base station, wherein the orthogonal resources may be time domain, frequency Domain or code channel, etc., which are not limited in this embodiment of the present invention; or,

On the resource used by the downlink reference signal, each serving cell of the first base station and each serving cell of the second base station transmit uplink data in a silent manner, wherein the resource used by the downlink reference signal The resources of the system can be uniformly distributed to each base station in the system by a central controller, such as a base station controller, which will not be described in detail in this embodiment of the present invention.

Further, for each base station in the simultaneous same-frequency full-duplex communication system, the measurement of the self-interference channel between the transmitting antenna and the receiving antenna requires the adjustment of the transmitting power, because the excessive transmitting power will saturate the receiving circuit , causing the base station to fail to work normally, therefore, the reference signal used for the measurement of the interference channel between the base stations cannot be used for the measurement of the self-interference channel. That is to say, when the first base station is not provided with an interference canceling circuit for canceling the interference signal between the transmitting antenna of the first base station and the receiving antenna of the first base station (i.e., the transmitting and receiving antenna at the base station When there is no good isolation between them), the downlink reference signal is also orthogonal to the signal sent by the first base station for self-interference channel measurement, so as to ensure the accuracy of channel information measurement.

Step 202: Feedback the acquired channel information to the first base station, so that the first base station allocates corresponding scheduling resources for downlink scheduling users according to the acquired channel information and passes the allocated scheduling resources Sending data to the downlink scheduled user.

Specifically, in the embodiment of the present invention, when the first base station allocates corresponding scheduling resources for downlink scheduling users according to the channel information fed back by the second base station, it can usually use the channel information fed back by the second base station information, determine available scheduling resources that cause relatively less interference to the second base station, and select corresponding scheduling resources from the available scheduling resources that cause relatively less interference to the second base station to allocate to the Downlink scheduling users to achieve the purpose of reducing the interference to the receiving antenna of the second base station or the users of the cells of the second base station, and further improving the effect of inter-cell interference cancellation.

Further, the obtained channel information is fed back to the first base station, so that the first base station allocates corresponding scheduling resources for downlink scheduling users according to the obtained channel information and uses the allocated scheduling resources Sending data to the downlink scheduling user may include:

feeding back the obtained channel information to the first base station, so that the first base station allocates corresponding scheduling resources for the downlink scheduling users according to the obtained channel information, and allocates the data of the downlink scheduling users Precoding is performed, and the precoded downlink scheduled user data is sent through the allocated scheduling resources.

Specifically, in the embodiment of the present invention, the Beamforming algorithm that forms a "null trap" for adjacent base stations can be used to precode the data of the downlink scheduling users, so as to reduce the The purpose of interference from the current cell to uplink users in adjacent cells.

Further, in the embodiment of the present invention, the method may also include:

If it is determined according to the channel information acquired during channel estimation that the interference channel power between the first base station and the second base station is greater than the set threshold, instruct the first base station to allocate the second base station to the second base station. Dedicated channel measurement resources and sending the downlink reference signal on the dedicated channel measurement resources.

Wherein, on the dedicated channel measurement resources, the serving cells of the first base station and the serving cells of the second base station usually do not send uplink signals and downlink signals, so as to improve the accuracy of channel information measurement results sex.

In addition, it should be noted that since channel measurement resources are not fixed, but will change with the change of channel conditions between base stations, in the embodiment of the present invention, the dedicated channels allocated for each base station The measurement resource also needs to be adjusted and changed according to the change of the channel condition between the base stations, which is not described in this embodiment of the present invention.

Embodiment 2 of the present invention provides an inter-cell interference cancellation method applicable to simultaneous and same-frequency full-duplex communication systems, because when performing channel estimation on the downlink channel, the distance between the base station receiving antenna and the adjacent base station transmitting antenna can be The channel is measured and fed back to the adjacent base station, so that the adjacent base station can comprehensively consider the downlink transmission of the current cell and the impact of the downlink transmission on the uplink reception of the adjacent cell when allocating downlink scheduling resources, so as to achieve a greater degree The purpose of effectively eliminating the inter-cell interference of the simultaneous and same-frequency full-duplex communication system is to improve the system performance of the simultaneous and same-frequency full-duplex communication system.

Embodiment three:

Embodiment 3 of the present invention takes both the first base station and the second base station interacting as the action performer as an example to further describe the inter-cell interference elimination method in Embodiment 1 or Embodiment 2 of the present invention. As shown in FIG. 4, it is a schematic flowchart of the method for eliminating inter-cell interference in Embodiment 3 of the present invention. The method for eliminating inter-cell interference may include the following steps:

Step 301: the first base station sends a downlink reference signal.

Specifically, in the embodiment of the present invention, in order to improve the accuracy of channel information measurement, when the first base station sends the downlink reference signal, it may perform corresponding processing on the downlink reference signal so that it satisfies The following conditions:

The downlink reference signals are respectively orthogonal to the uplink reference signals of the serving cells of the first base station and the uplink reference signals of the serving cells of the second base station, wherein the orthogonal resources may be time domain, frequency Domain or code channel, etc., which are not limited in this embodiment of the present invention; or,

On the resource used by the downlink reference signal, each serving cell of the first base station and each serving cell of the second base station transmit uplink data in a silent manner, wherein the resource used by the downlink reference signal The resources of the system can be uniformly distributed to each base station in the system by a central controller, such as a base station controller, which will not be described in detail in this embodiment of the present invention.

Further, for each base station in the simultaneous same-frequency full-duplex communication system, the measurement of the self-interference channel between the transmitting antenna and the receiving antenna requires the adjustment of the transmitting power, because the excessive transmitting power will saturate the receiving circuit , causing the base station to fail to work normally, therefore, the reference signal used for the measurement of the interference channel between the base stations cannot be used for the measurement of the self-interference channel. That is to say, when the first base station is not provided with an interference canceling circuit for canceling the interference signal between the transmitting antenna of the first base station and the receiving antenna of the first base station (i.e., the transmitting and receiving antenna at the base station When there is no good isolation between them), the downlink reference signal is also orthogonal to the signal sent by the first base station for self-interference channel measurement, so as to ensure the accuracy of channel information measurement.

Step 302: The second base station receives the downlink reference signal sent by the first base station, and performs channel estimation according to the downlink reference signal to obtain corresponding channel information, wherein the obtained channel information includes the channel information of the first base station Channel information between the transmitting antenna and the receiving antenna of the second base station.

Specifically, in a simultaneous and same-frequency full-duplex communication system, the channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station can be at least compatible with the transmitting antenna of the first base station and the Interference signals between receiving antennas of the second base station are correlated, which is not limited in this embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, the channel information acquired by the second base station when performing channel estimation according to the downlink reference signal may include the transmitting antenna of the first base station and the second In addition to the channel information between the receiving antennas of the two base stations, it may also generally include channel information between the base station and users, such as channel information between users in the cells of the first base station and the second base station. The embodiment of the invention does not make any limitation on this.

Step 303: the second base station feeds back the acquired channel information to the first base station.

Specifically, the second base station may directly feed back the obtained channel information to the first base station, or send the obtained channel information to the central controller, and the central control The obtained channel information is fed back to the first base station in a manner of performing unified allocation by a device, which is not limited in the example of the present invention.

Step 304: The first base station receives the channel information fed back by the second base station, and allocates corresponding scheduling resources for the downlink scheduling users according to the channel information fed back by the second base station, and uses the allocated scheduling resources for the downlink scheduling users. Scheduling users to send data.

Wherein, the channel information fed back by the second base station is obtained when the second base station performs channel estimation according to the downlink reference signal, including the transmitting antenna of the first base station and the second base station The channel information of the channel information between the receiving antennas is not described in this embodiment of the present invention.

Further, allocating corresponding scheduling resources for downlink scheduling users according to the channel information fed back by the second base station may generally be to determine available resources that have relatively low interference to the second base station according to the channel information fed back by the second base station. small scheduling resources, and select corresponding scheduling resources from the available scheduling resources that have relatively little interference to the second base station to allocate to the downlink scheduling user, so as to reduce the impact on the second base station receiving antenna or The purpose of the interference of the users of the cells of the second base station is to improve the effect of inter-cell interference cancellation.

Further, in the embodiment of the present invention, before sending data to the downlink scheduling user through the allocated scheduling resources, the method may further include:

Precoding the data of the downlink scheduled user according to the channel information fed back by the second base station. Specifically, in the embodiment of the present invention, the Beamforming algorithm that forms a "null trap" for adjacent base stations can be used to precode the data of the downlink scheduling user, and then use the allocated scheduling resources to The precoded downlink scheduling user data is sent to achieve the purpose of reducing the interference of the current cell to the uplink users of adjacent cells while ensuring the transmission of downlink services.

Further, in order to further improve the accuracy of channel information measurement results, in the embodiment of the present invention, the method may further include:

According to the channel information fed back by the second base station, determine whether the interference channel power between the first base station and the second base station is greater than a set threshold, and if so, allocate dedicated channel measurement resources for the second base station , and send the downlink reference signal on the dedicated channel measurement resource.

Specifically, in the embodiments of the present invention, each base station (the first base station or the second base station) can judge whether the downlink transmission of the adjacent base station is harmful to itself according to the average power of the interference channel of the adjacent base station measured within the set time period. If it is found that the adjacent base station has caused serious interference to the base station (for example, the average power of the adjacent base station interference channel measured within the set time period is greater than the set threshold), you can use the allocation of dedicated channel measurement resources (including resources such as time domain, frequency domain or code channel), and perform more accurate channel estimation by sending or receiving downlink reference signals through the dedicated channel measurement resources, so as to improve the accuracy of channel information measurement results.

Further, in the embodiment of the present invention, on the dedicated channel measurement resources, the serving cells of the first base station and the serving cells of the second base station usually do not send uplink signals and downlink signals , so as to improve the accuracy of channel information measurement results.

In addition, it should be noted that since channel measurement resources are not fixed, but will change with the change of channel conditions between base stations, in the embodiment of the present invention, the dedicated channels allocated for each base station The measurement resource also needs to be adjusted and changed according to the change of the channel condition between the base stations, which is not described in this embodiment of the present invention.

It should be noted that, in the embodiments of the present invention, on the inter-base station dedicated channel measurement resources, the channel information obtained through the downlink reference signal can be fed back through the X2 interface, wireless Backhaul, or through the respective optical fibers of the base stations. to the central controller, and then the central controller uniformly distributes the channel information, which will not be described in this embodiment of the present invention.

Embodiment 3 of the present invention provides an inter-cell interference cancellation method applicable to simultaneous and same-frequency full-duplex communication systems. When sending data to downlink scheduling users, the base station transmitting antennas that can receive feedback from adjacent base stations and Adjacent base stations receive channel information between antennas and allocate downlink scheduling resources according to the channel information, which can comprehensively consider the downlink transmission of the current cell and the impact of downlink transmission on the uplink reception of adjacent cells, so as to achieve a greater degree The purpose of effectively eliminating the inter-cell interference of the simultaneous and same-frequency full-duplex communication system is to improve the system performance of the simultaneous and same-frequency full-duplex communication system.

Embodiment four:

Embodiment 4 of the present invention provides an apparatus for eliminating inter-cell interference applicable to the method shown in Embodiment 1 or Embodiment 3 of the present invention. Specifically, the apparatus for eliminating inter-cell interference may generally be a base station or an integrated device set in a base station, which is not limited in this embodiment of the present invention.

Specifically, in the fourth embodiment of the present invention, the inter-cell interference cancellation apparatus is taken as an example for specific description. As shown in FIG. 5, it is a schematic structural diagram of the base station described in Embodiment 4 of the present invention. The base station may include a reference signal sending unit 11, a channel information receiving unit 12, and a downlink data sending unit 13, wherein:

The reference signal sending unit 11 may be configured to send a downlink reference signal, so that adjacent base stations of the base station perform channel estimation and obtain corresponding channel information according to the downlink reference signal;

The channel information receiving unit 12 may be configured to receive the channel information fed back by the neighboring base station;

The downlink data sending unit 13 may be configured to allocate corresponding scheduling resources for downlink scheduling users according to the channel information received by the channel information receiving unit 12, and perform data scheduling for the downlink scheduling users through the allocated scheduling resources. send;

Wherein, the channel information includes channel information between the transmitting antenna of the base station and the receiving antenna of the adjacent base station.

Specifically, in a simultaneous and same-frequency full-duplex communication system, the channel information between the transmitting antenna of the base station and the receiving antenna of the adjacent base station can be at least the same as the channel information between the transmitting antenna of the base station and the adjacent base station. Interference signal correlation between receiving antennas is not limited in this embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, the channel information acquired by the neighboring base station according to the downlink reference signal may include the transmitting antenna of the base station and the receiving antenna of the neighboring base station In addition to the channel information between the base station and the user, it can also generally include the channel information between the base station and the user, such as the channel information between the base station and the user in each cell of the adjacent base station, etc., and the embodiment of the present invention does not make any limited.

Further, in the embodiment of the present invention, in order to improve the accuracy of channel information measurement, the downlink reference signal sent by the first base station usually needs to meet the following conditions:

The downlink reference signal is orthogonal to the uplink reference signal of each serving cell of the base station and the uplink reference signal of each serving cell of the adjacent base station, wherein the resources for performing orthogonality can be time domain, frequency domain or Code tracks, etc., which are not limited in this embodiment of the present invention; or,

On the resources used by the downlink reference signal, each serving cell of the base station and each serving cell of the adjacent base station transmits uplink data in a silent manner, wherein the resources used by the downlink reference signal The central controller, such as the base station controller, can uniformly deliver the information to each base station in the system, which will not be described in detail in this embodiment of the present invention.

Further, for each base station in the simultaneous same-frequency full-duplex communication system, the measurement of the self-interference channel between the transmitting antenna and the receiving antenna requires the adjustment of the transmitting power, because the excessive transmitting power will saturate the receiving circuit , causing the base station to fail to work normally, therefore, the reference signal used for the measurement of the interference channel between the base stations cannot be used for the measurement of the self-interference channel. That is to say, when the base station is not provided with an interference canceling circuit for canceling the interference signal between the transmitting antenna of the base station and the receiving antenna of the base station (that is, the transmitting and receiving antennas at the base station cannot achieve good isolation), the downlink reference signal is also orthogonal to the signal sent by the base station for self-interference channel measurement, so as to ensure the accuracy of channel information measurement.

Further, the base station may also include a dedicated resource allocation unit 14, wherein:

The dedicated resource allocation unit 14 can be configured to: if it is determined according to the channel information fed back by the adjacent base station that the interference channel power between the base station and the adjacent base station is greater than a set threshold, then the adjacent base station The base station allocates dedicated channel measurement resources. Correspondingly, the reference signal sending unit 11 is specifically configured to send the downlink reference signal on the dedicated channel measurement resource.

Wherein, on the dedicated channel measurement resource, each serving cell of the base station and each serving cell of the adjacent base station do not send uplink signals and downlink signals, so as to improve the accuracy of channel information measurement results.

In addition, it should be noted that since channel measurement resources are not fixed, but will change with the change of channel conditions between base stations, in the embodiment of the present invention, the dedicated channels allocated for each base station The measurement resource also needs to be adjusted and changed according to the change of the channel condition between the base stations, which is not described in this embodiment of the present invention.

Further, in the embodiment of the present invention, the base station may further include a data precoding unit 15, wherein:

The data precoding unit 15 may be configured to perform data precoding on the downlink scheduling user according to the channel information fed back by the adjacent base station before sending data to the downlink scheduling user through the allocated scheduling resources. precoded. Specifically, in the embodiment of the present invention, the data precoding unit 15 can use the Beamforming algorithm that forms a "null trap" for adjacent base stations to precode the data of the downlink scheduled users, so as to ensure that While the downlink business is being transmitted, the purpose of reducing the interference of the local cell to the uplink users of the neighboring cells.

Correspondingly, the downlink data sending unit 13 is specifically configured to send the precoded downlink scheduled user data through the allocated scheduling resources.

Embodiment 4 of the present invention provides an inter-cell interference cancellation device applicable to simultaneous and same-frequency full-duplex communication systems. When sending data to downlink scheduling users, the base station transmitting antenna and Adjacent base stations receive channel information between antennas and allocate downlink scheduling resources according to the channel information, which can comprehensively consider the downlink transmission of the current cell and the impact of downlink transmission on the uplink reception of adjacent cells, so as to achieve a greater degree The purpose of effectively eliminating the inter-cell interference of the simultaneous and same-frequency full-duplex communication system is to improve the system performance of the simultaneous and same-frequency full-duplex communication system.

Embodiment five:

Embodiment 5 of the present invention provides an inter-cell interference elimination device applicable to the method shown in Embodiment 2 or Embodiment 3 of the present invention. Specifically, the apparatus for eliminating inter-cell interference may generally be a base station or an integrated device set in a base station, which is not limited in this embodiment of the present invention.

Specifically, in the fifth embodiment of the present invention, the inter-cell interference cancellation apparatus is taken as an example for specific description. As shown in FIG. 6, it is a schematic structural diagram of the base station described in Embodiment 5 of the present invention. The base station may include a reference signal receiving unit 21, a channel information obtaining unit 22, and a channel information feedback unit 23, wherein:

The reference signal receiving unit 21 may be configured to receive a downlink reference signal sent by a neighboring base station of the base station;

The channel information obtaining unit 22 may be configured to perform channel estimation according to the downlink reference signal received by the reference signal receiving unit 21 to obtain corresponding channel information, wherein the obtained channel information includes channel information between the transmitting antenna and the receiving antenna of the base station;

The channel information feedback unit 23 may be configured to feed back the acquired channel information to the adjacent base station, so that the adjacent base station allocates corresponding scheduling resources for downlink scheduling users according to the acquired channel information and Send data to the downlink scheduling user through the allocated scheduling resources; specifically, the channel information feedback unit 23 can be used to feed back the obtained channel information to the adjacent base station, so that the corresponding The adjacent base station allocates corresponding scheduling resources for the downlink scheduling users according to the obtained channel information, and precodes the data of the downlink scheduling users, and, through the allocated scheduling resources, performs precoding for the downlink scheduling users data to send.

Wherein, the channel information feedback unit 23 can use the Beamforming algorithm that forms a "null trap" for adjacent base stations to perform precoding processing on the data of the downlink scheduling user, so as to reduce the impact of the cell while ensuring the transmission of downlink services. The purpose of the interference of uplink users in adjacent cells is not described in this embodiment of the present invention.

Further, in the embodiment of the present invention, in the simultaneous same-frequency full-duplex communication system, the channel information between the transmitting antenna of the adjacent base station and the receiving antenna of the base station can be at least the same as that of the adjacent The interference signal between the transmitting antenna of the base station and the receiving antenna of the base station is related, which is not limited in this embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, the channel information obtained by the base station according to the downlink reference signal may include the channel information between the transmitting antenna of the neighboring base station and the receiving antenna of the base station In addition to the channel information, channel information between the base station and the user may generally be included, such as channel information between the adjacent base station and the user in each cell of the base station, etc., which is not limited in this embodiment of the present invention.

Further, in the embodiment of the present invention, in order to improve the accuracy of channel information measurement, the downlink reference signal sent by the first base station usually needs to meet the following conditions:

The downlink reference signal is orthogonal to the uplink reference signal of each serving cell of the base station and the uplink reference signal of each serving cell of the adjacent base station, wherein the resources for performing orthogonality can be time domain, frequency domain or Code tracks, etc., which are not limited in this embodiment of the present invention; or,

On the resources used by the downlink reference signal, each serving cell of the base station and each serving cell of the adjacent base station transmits uplink data in a silent manner, wherein the resources used by the downlink reference signal The central controller, such as the base station controller, can uniformly deliver the information to each base station in the system, which will not be described in detail in this embodiment of the present invention. .

Further, for each base station in the simultaneous same-frequency full-duplex communication system, the measurement of the self-interference channel between the transmitting antenna and the receiving antenna requires the adjustment of the transmitting power, because the excessive transmitting power will saturate the receiving circuit , causing the base station to fail to work normally, therefore, the reference signal used for the measurement of the interference channel between the base stations cannot be used for the measurement of the self-interference channel. That is to say, when the adjacent base station is not provided with an interference cancellation circuit for canceling the interference signal between the transmitting antenna of the adjacent base station and the receiving antenna of the adjacent base station (i.e., the base station transceiver antenna When there is no good isolation between them), the downlink reference signal and the signal sent by the adjacent base station for self-interference channel measurement should also be orthogonal to ensure the accuracy of channel information measurement.

Further, the base station may also include a dedicated resource indication unit 24, wherein:

The dedicated resource indication unit 24 may be configured to, if it is determined according to the obtained channel information that the interference channel power between the adjacent base station and the base station is greater than a set threshold, then instruct the adjacent base station to be the The base station allocates dedicated channel measurement resources and sends the downlink reference signal on the dedicated channel measurement resources.

Wherein, on the dedicated channel measurement resources, each serving cell of the adjacent base station and each serving cell of the base station do not send uplink signals and downlink signals, so as to improve the accuracy of channel information measurement results.

In addition, it should be noted that since channel measurement resources are not fixed, but will change with the change of channel conditions between base stations, in the embodiment of the present invention, the dedicated channels allocated for each base station The measurement resource also needs to be adjusted and changed according to the change of the channel condition between the base stations, which is not described in this embodiment of the present invention.

Embodiment 5 of the present invention provides an inter-cell interference cancellation device applicable to a simultaneous and same-frequency full-duplex communication system. When performing channel estimation on a downlink channel, it can The channel is measured and fed back to the adjacent base station, so that the adjacent base station can comprehensively consider the downlink transmission of the current cell and the impact of the downlink transmission on the uplink reception of the adjacent cell when allocating downlink scheduling resources, so as to achieve a greater degree The purpose of effectively eliminating the inter-cell interference of the simultaneous and same-frequency full-duplex communication system is to improve the system performance of the simultaneous and same-frequency full-duplex communication system.

Embodiment six:

Embodiment 6 of the present invention provides an inter-cell interference elimination system applicable to a simultaneous and same-frequency full-duplex communication system. Specifically, as shown in FIG. 7 , which is a schematic structural diagram of the inter-cell interference cancellation system in Embodiment 6 of the present invention, the system may include at least one first base station 31 and at least one second base station 32, wherein:

The first base station 31 may be configured to send a downlink reference signal, receive channel information fed back by the second base station 32, and allocate corresponding scheduling resources for downlink scheduling users according to the channel information, and use the allocated scheduling resources to sending data to the downlink scheduled user, wherein the channel information includes channel information between the transmitting antenna of the first base station 31 and the receiving antenna of the second base station 32;

The second base station 32 may be configured to receive the downlink reference signal sent by the first base station 31, perform channel estimation according to the downlink reference signal to obtain corresponding channel information, and feed back the obtained channel information to the Describe the first base station 31.

Specifically, in a simultaneous and same-frequency full-duplex communication system, the channel information between the transmitting antenna of the first base station 31 and the receiving antenna of the second base station 32 can be at least the same as that of the transmitting antenna of the first base station 31. It is related to the interference signal between the receiving antennas of the second base station 32, which is not limited in this embodiment of the present invention.

It should be noted that, in the embodiment of the present invention, the channel information acquired by the second base station 32 according to the downlink reference signal may include the transmitting antenna of the first base station 31 and the channel information of the second base station In addition to the channel information between the receiving antennas of 32, channel information between base stations and users may also be included, such as channel information between users in the cells of the first base station 31 and the second base station 32, etc., The embodiment of the present invention does not make any limitation on this.

It should be noted that the functions of the first base station 31 and the second base station 32 can be interchanged, that is, in the embodiment of the present invention, for any base station in the system, the base station can simultaneously have Functions of the first base station 31 and the second base station 32. In addition, it should be noted that the specific structures of the first base station 31 and the second base station 32 are similar to the base stations described in the fourth embodiment of the present invention and the fifth embodiment of the present invention respectively, and the embodiments of the present invention will not elaborate on this repeat.

Embodiment 6 of the present invention provides an inter-cell interference cancellation system applicable to simultaneous and same-frequency full-duplex communication systems, because when performing channel estimation on downlink channels, it is possible to The channel is measured and fed back to the adjacent base station, so that the adjacent base station can comprehensively consider the downlink transmission of the current cell and the impact of the downlink transmission on the uplink reception of the adjacent cell when allocating downlink scheduling resources, so as to achieve a greater degree The purpose of effectively eliminating the inter-cell interference of the simultaneous and same-frequency full-duplex communication system is to improve the system performance of the simultaneous and same-frequency full-duplex communication system.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, devices (devices), or computer program products. Accordingly, the present invention can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (25)

1. A method for eliminating interference between cells, applicable to simultaneous and same-frequency full-duplex communication systems, is characterized in that, comprising: The first base station sends a downlink reference signal, so that a second base station adjacent to the first base station performs channel estimation and acquires corresponding channel information according to the downlink reference signal; receiving the channel information fed back by the second base station, and allocating corresponding scheduling resources for downlink scheduling users according to the channel information, and sending data to the downlink scheduling users through the allocated scheduling resources, wherein, The channel information includes channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station. 2. The inter-cell interference cancellation method according to claim 1, characterized in that, The downlink reference signal is respectively orthogonal to the uplink reference signal of each serving cell of the first base station and the uplink reference signal of each serving cell of the second base station; or, On resources used by the downlink reference signal, each serving cell of the first base station and each serving cell of the second base station transmit uplink data in a silent manner. 3. The inter-cell interference cancellation method according to claim 2, characterized in that, When the first base station is not provided with an interference cancellation circuit for canceling the interference signal between the transmitting antenna of the first base station and the receiving antenna of the first base station, the downlink reference signal is also related to the The signals sent by the first base station for self-interference channel measurement are orthogonal. 4. The inter-cell interference cancellation method according to any one of claims 1 to 3, characterized in that the method further comprises: If, according to the channel information fed back by the second base station, it is determined that the interference channel power between the first base station and the second base station is greater than a set threshold, allocating dedicated channel measurement resources for the second base station, and sending the downlink reference signal on the dedicated channel measurement resource. 5. The inter-cell interference cancellation method according to claim 4, characterized in that, On the dedicated channel measurement resources, the serving cells of the first base station and the serving cells of the second base station do not send uplink signals and downlink signals. 6. The inter-cell interference cancellation method according to any one of claims 1 to 3, wherein before sending data to the downlink scheduling user through the allocated scheduling resources, the method further comprises: Precoding the data of the downlink scheduled user according to the channel information fed back by the second base station; Sending data to the downlink scheduling user through the allocated scheduling resources, including: The precoded downlink scheduled user data is sent through the allocated scheduling resources. 7. A method for eliminating interference between cells, suitable for simultaneous and same-frequency full-duplex communication systems, characterized in that it includes: The second base station receives a downlink reference signal sent by a first base station adjacent to the second base station, and performs channel estimation according to the downlink reference signal to obtain corresponding channel information, wherein the obtained channel information includes the channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station; feeding back the obtained channel information to the first base station, so that the first base station allocates corresponding scheduling resources for downlink scheduling users according to the obtained channel information and uses the allocated scheduling resources to Downlink scheduling users to send data. 8. The inter-cell interference cancellation method according to claim 7, characterized in that, The downlink reference signal is respectively orthogonal to the uplink reference signal of each serving cell of the first base station and the uplink reference signal of each serving cell of the second base station; or, On resources used by the downlink reference signal, each serving cell of the first base station and each serving cell of the second base station transmit uplink data in a silent manner. 9. The inter-cell interference cancellation method according to claim 8, characterized in that, When the first base station is not provided with an interference cancellation circuit for canceling the interference signal between the transmitting antenna of the first base station and the receiving antenna of the first base station, the downlink reference signal is also related to the The signals sent by the first base station for self-interference channel measurement are orthogonal. 10. The inter-cell interference cancellation method according to any one of claims 7 to 9, characterized in that the method further comprises: If it is determined according to the obtained channel information that the interference channel power between the first base station and the second base station is greater than a set threshold, instruct the first base station to allocate a dedicated channel measurement for the second base station resources and transmit the downlink reference signal on the dedicated channel measurement resources. 11. The inter-cell interference cancellation method according to claim 10, characterized in that, On the dedicated channel measurement resources, the serving cells of the first base station and the serving cells of the second base station do not send uplink signals and downlink signals. 12. The inter-cell interference cancellation method according to any one of claims 7 to 9, wherein the acquired channel information is fed back to the first base station, so that the first base station The received channel information allocates corresponding scheduling resources for the downlink scheduling users and sends data to the downlink scheduling users through the allocated scheduling resources, including: feeding back the obtained channel information to the first base station, so that the first base station allocates corresponding scheduling resources for the downlink scheduling users according to the obtained channel information, and allocates the data of the downlink scheduling users Precoding is performed, and the precoded downlink scheduled user data is sent through the allocated scheduling resources. 13. A base station, suitable for simultaneous and same-frequency full-duplex communication systems, characterized in that it comprises: a reference signal sending unit, configured to send a downlink reference signal, so that adjacent base stations of the base station perform channel estimation and acquire corresponding channel information according to the downlink reference signal; a channel information receiving unit, configured to receive the channel information fed back by the neighboring base station; a downlink data sending unit, configured to allocate corresponding scheduling resources for downlink scheduling users according to the channel information received by the information receiving unit, and send data to the downlink scheduling users through the allocated scheduling resources, wherein, The channel information includes channel information between the transmitting antenna of the base station and the receiving antenna of the adjacent base station. 14. The base station according to claim 13, wherein, The downlink reference signal is respectively orthogonal to the uplink reference signal of each serving cell of the base station and the uplink reference signal of each serving cell of the adjacent base station; or, On resources used by the downlink reference signal, each serving cell of the base station and each serving cell of the adjacent base station transmits uplink data in a silent manner. 15. The base station according to claim 14, wherein, When the base station is not provided with an interference cancellation circuit for canceling the interference signal between the transmitting antenna of the base station and the receiving antenna of the base station, the downlink reference signal is also used for canceling the interference signal sent by the base station Signal quadrature for self-interfering channel measurements. 16. The base station according to any one of claims 13-15, wherein the base station further comprises a dedicated resource allocation unit: The dedicated resource allocation unit is configured to, if it is determined according to the channel information fed back by the adjacent base station that the power of the interference channel between the base station and the adjacent base station is greater than a set threshold, then the adjacent base station The base station allocates dedicated channel measurement resources; The reference signal sending unit is specifically configured to send the downlink reference signal on the dedicated channel measurement resource. 17. The base station of claim 16, wherein, On the dedicated channel measurement resources, each serving cell of the base station and each serving cell of the neighboring base station do not send uplink signals and downlink signals. 18. The base station according to any one of claims 13-15, further comprising a data precoding unit: The data precoding unit is configured to perform data precoding on the downlink scheduling user according to the channel information fed back by the adjacent base station before sending data to the downlink scheduling user through the allocated scheduling resources precoding; The downlink data sending unit is specifically configured to send the precoded downlink scheduling user data through the allocated scheduling resources. 19. A base station, characterized in that it is suitable for simultaneous and same-frequency full-duplex communication systems, comprising: a reference signal receiving unit, configured to receive a downlink reference signal sent by a neighboring base station of the base station; a channel information obtaining unit, configured to perform channel estimation according to the downlink reference signal received by the reference signal receiving unit to obtain corresponding channel information, wherein the obtained channel information includes the transmission antenna and channel information between receiving antennas of the base station; a channel information feedback unit, configured to feed back the obtained channel information to the adjacent base station, so that the adjacent base station allocates corresponding scheduling resources for downlink scheduling users according to the obtained channel information and passes the obtained The allocated scheduling resources send data to the downlink scheduling users. 20. The base station of claim 19, wherein The downlink reference signal is respectively orthogonal to the uplink reference signal of each serving cell of the adjacent base station and the uplink reference signal of each serving cell of the base station; or, On the resources used by the downlink reference signal, each serving cell of the adjacent base station and each serving cell of the base station transmit uplink data in a silent manner. 21. The base station of claim 20, wherein, When the adjacent base station is not provided with an interference cancellation circuit for canceling the interference signal between the transmitting antenna of the adjacent base station and the receiving antenna of the adjacent base station, the downlink reference signal is also related to the adjacent base station. The signals sent by the adjacent base stations for self-interference channel measurement are orthogonal. 22. The base station according to any one of claims 19-21, wherein the base station further comprises a dedicated resource indication unit: The dedicated resource indicating unit is configured to, if it is determined according to the acquired channel information that the interference channel power between the adjacent base station and the base station is greater than a set threshold, indicate that the adjacent base station is the The base station allocates dedicated channel measurement resources and sends the downlink reference signal on the dedicated channel measurement resources. 23. The base station of claim 22, wherein On the dedicated channel measurement resources, each serving cell of the adjacent base station and each serving cell of the base station do not send uplink signals and downlink signals. 24. The base station according to any one of claims 19-21, characterized in that, The channel information feedback unit is specifically configured to feed back the obtained channel information to the adjacent base station, so that the adjacent base station allocates corresponding scheduling resources for downlink scheduling users according to the obtained channel information , and perform precoding on the data of the downlink scheduling user, and send the precoded downlink scheduling user data through the allocated scheduling resources. 25. An inter-cell interference cancellation system, suitable for simultaneous and same-frequency full-duplex communication systems, characterized in that it includes at least one first base station and at least one second base station, wherein: The first base station is configured to send a downlink reference signal, receive channel information fed back by the second base station, and allocate corresponding scheduling resources for downlink scheduling users according to the channel information, and use the allocated scheduling resources to The downlink scheduling user performs data transmission, wherein the channel information includes channel information between the transmitting antenna of the first base station and the receiving antenna of the second base station; The second base station is configured to receive the downlink reference signal sent by the first base station, perform channel estimation according to the downlink reference signal to obtain corresponding channel information, and feed back the obtained channel information to the first base station.