WO2015007122A1

WO2015007122A1 - Interference processing method and base station

Info

Publication number: WO2015007122A1
Application number: PCT/CN2014/079720
Authority: WO
Inventors: 刘劲楠
Original assignee: 华为技术有限公司
Priority date: 2013-07-17
Filing date: 2014-06-12
Publication date: 2015-01-22
Also published as: CN103402206A

Abstract

Provided are an interference processing method and a base station. The method comprises: in an uplink interference subframe of a same-frequency neighbour small cell base station, a small cell base station measuring the feature measurement amount of a downlink reference signal of the same-frequency neighbour small cell base station; and according to the feature measurement amount, the small cell base station determining scheduling information used for a scheduling terminal, and scheduling the scheduling terminal according to the scheduling information. The present invention can reduce the interference among same-frequency small cell base stations according to the feature measurement amount.

Description

Interference processing method and base station This application claims priority to Chinese Patent Application No. 201310300293. 0, entitled "Interference Processing Method and Base Station", filed on July 17, 2013, the entire contents of which are incorporated by reference. Combined in this application. TECHNICAL FIELD The present invention relates to communications technologies, and in particular, to an interference processing method and a base station. Background technique

In order to improve spectrum utilization and support flexible uplink and downlink services, Time Division Duplexing (TDD) is introduced in cellular communication. The TDD system is currently being standardized by Long Term Evolution (LTE). accept. In the TDD mode, the uplink and downlink shared frequency bands are divided in time, and the position between the uplink and the downlink can be flexibly configured. For example, in the LTE standard, a variety of different uplink-downlink ratios are supported, which can satisfy different types of uplink and downlink asymmetric services.

However, in an actual network, considering the uplink and downlink interference problems between cells, coexistence of co-frequency cells of different ratios is very difficult, and there may be interference of the base station to the base station (BS-BS) and terminal-to-terminal (UE-UE). interference. For example, assume that base station 1 and base station 2 use different ratios, that is, base station 1 uses TDD ratio al, and base station 2 uses TDD ratio a2. Then, when the base station 1 transmits the downlink data, it will interfere with the uplink data received by the base station 2. Conversely, for the terminal similarly, when the terminal 2 belonging to the base station 2 transmits the uplink, it may cause serious interference to the downlink data of the terminal 1 belonging to the base station 1 receiving the base station 1. In order to avoid such uplink and downlink interference, the base stations in the isomorphic co-frequency network use the same ratio, but this limits the base stations of different services to independently adjust their respective ratio configurations according to their uplink and downlink service dynamics, which is not conducive to improving the spectrum. effectiveness. In the currently proposed heterogeneous scenario, a smaller coverage area is added within the coverage of the macro base station, such as a small cell base station; if the small cell and the macro cell are not on the same frequency, the small cell base station can be allowed to independently according to its own Load changes change the TDD ratio.

In order to prevent the small cell base station from dynamically changing the ratio according to the service configuration in the above heterogeneous scenario, the prior art proposes a technique of adopting a blank subframe, that is, introducing a new subframe type in the current frame structure, that is, neither Send uplink, and do not send downlink, instead of conflicting uplink or downlink Subframes, resolve conflicts. However, this method wastes spectrum resources because some subframes are not used to transmit data.

Summary of the invention

The embodiment of the invention provides an interference processing method and a base station, so as to reduce interference of a base station of a small-frequency base station.

In a first aspect, an interference processing method is provided, including:

The small cell base station measures the feature measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station in the uplink interference subframe of the same-frequency neighbor small cell base station;

The small cell base station determines scheduling information used for scheduling the terminal according to the feature measurement quantity, and schedules the scheduling terminal according to the scheduling information.

With reference to the first aspect, in a first possible implementation manner, the measuring the feature measurement quantity of the downlink reference signal of the same-frequency neighboring small cell base station includes: measuring a downlink reference signal of the same-frequency neighbor small cell base station The signal receiving power is determined by the small cell base station according to the feature measurement quantity, and the determining, by the small cell base station, the expected transmission power of the scheduling terminal according to the received power of the signal; And determining the uplink transmit power of the scheduling terminal according to the expected transmit power; the scheduling, by the small cell base station, the uplink transmit power, to the scheduling terminal, So that the scheduling terminal sends uplink data by using the uplink transmit power.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the determining, by the expected transmit power, the uplink transmit power of the scheduling terminal includes: if the expected transmit power is less than The maximum uplink transmit power of the scheduling terminal is determined, and the expected transmit power is determined as the uplink transmit power of the scheduling terminal.

With reference to the second possible implementation of the first aspect, in a third possible implementation, the scheduling terminal is that the small cell base station selects from at least two to-be-selected terminals; if the expected transmission exists The at least two to-be-selected terminals whose power is smaller than the maximum uplink transmit power of the to-be-selected terminal, the scheduling terminal is determined by the small cell base station to select from at least two to-be-selected terminals, including: selecting the at least two The to-be-selected terminal with the smallest expected transmit power in the terminal to be selected is used as the scheduling terminal.

In conjunction with the first possible implementation of the first aspect, in a fourth possible implementation, Determining, according to the expected transmit power, the uplink transmit power of the scheduling terminal, if: the expected transmit power is greater than or equal to a maximum uplink transmit power of the scheduling terminal, determining to use the maximum uplink transmit power as a location The scheduling of the uplink transmission power of the scheduling terminal; the scheduling of the scheduling terminal according to the scheduling information, further comprising: the small cell base station notifying the scheduling terminal, the downlink reference signal of the same-frequency neighbor small cell base station No uplink data is sent on the resource unit where it is located.

With the fourth possible implementation of the first aspect, in a fifth possible implementation, after the determining, by using the maximum uplink transmit power, the uplink transmit power of the scheduling terminal, the method further includes: The small cell base station notifies the same-frequency neighboring small cell base station to the same-frequency neighboring small cell base station, so that the same-frequency neighboring small cell base station selects the uplink reference signal according to the uplink reference signal pattern. The neighboring terminal is scheduled to be less than the threshold value, and the neighboring terminal is the terminal served by the intra-frequency neighboring small cell base station.

With reference to the first possible implementation manner of the first aspect, in a sixth possible implementation, if the expected transmit power is greater than or equal to a maximum uplink transmit power of the scheduling terminal, the method further includes: The small cell base station notifies the same-frequency neighbor small cell base station, and requests the same-frequency neighbor small cell base station to transmit downlink data with power less than or equal to critical power; the critical power is equal to the downlink reference of the same-frequency neighbor small cell base station The transmit power of the signal is subtracted from the power difference, and the power difference is equal to a difference between a maximum signal received power of the intra-frequency neighbor small cell base station and the received power of the signal that the small cell base station can accept.

With reference to the first aspect, in a seventh possible implementation, the measuring the feature measurement quantity of the downlink reference signal of the same-frequency neighboring small cell base station includes: measuring a downlink reference signal of the same-frequency neighbor small cell base station Determining the scheduling information for scheduling the terminal according to the characteristic measurement quantity, the method includes: determining, by the small cell base station, a beamforming direction angle of the scheduling terminal according to the signal arrival angle The beamforming direction angle and the signal arrival angle satisfy a distance threshold; the scheduling the scheduling terminal according to the scheduling information, including: the small cell base station corresponding to the beamforming direction angle The scheduling terminal performs scheduling.

With reference to the seventh possible implementation manner of the foregoing aspect, in an eighth possible implementation, after the measuring a signal arrival angle of the downlink reference signal of the same-frequency neighboring small cell base station, the method further includes: The cell base station notifies the same-frequency neighbor small cell base station to the same-frequency neighbor small cell base station for indicating the angle of arrival indication information of the signal arrival angle, so that the same-frequency neighbor small cell base station arrives according to the The angle indication information is selected by the target neighboring terminal, where the target neighboring terminal is the terminal served by the same-frequency neighboring small-cell base station, and the beamforming direction angle of the target neighboring terminal and the signal arrival angle satisfy the remote threshold .

With reference to the eighth possible implementation manner of the foregoing aspect, in the ninth possible implementation manner, the angle of arrival indication information includes: the signal arrival angle or a precoding matrix indication.

With reference to the first aspect, in a tenth possible implementation, before the measuring the feature measurement quantity of the downlink reference signal of the same-frequency neighboring small cell base station, the method further includes: determining, by the small cell base station, the same-frequency neighbor a small cell base station and the uplink interference subframe.

With reference to the tenth possible implementation manner of the foregoing aspect, in the eleventh possible implementation manner, the small cell base station determines the same-frequency neighbor small cell base station and the uplink interference subframe, including: The small cell base station parses the broadcast message of the other base station, and obtains the cell identifier and the uplink and downlink ratio included in the broadcast message, and determines that the another base station is a co-frequency neighbor small cell base station; The uplink and downlink ratio determines the uplink interference subframe.

With reference to the tenth possible implementation manner of the foregoing aspect, in a twelfth possible implementation manner, the determining, by the small cell base station, the intra-frequency neighboring small cell base station and the uplink interference subframe, The small cell base station detects the signal receiving power of the downlink reference signal of the other base station in its own uplink subframe, and if the signal received power is greater than or equal to the preset threshold, determining that the another base station is the same frequency a neighboring small cell base station, and the uplink subframe is the uplink interference subframe.

In a second aspect, a base station is provided, including:

And an information acquiring unit, configured to measure, in an uplink interference subframe of the same-frequency neighbor small cell base station, a feature measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station;

a scheduling processing unit, configured to determine scheduling information used by the scheduling terminal according to the feature measurement quantity measured by the information acquiring unit;

And a scheduling execution unit, configured to schedule the scheduling terminal according to the scheduling information determined by the scheduling processing unit.

With reference to the second aspect, in a first possible implementation, the information acquiring unit is specifically configured to measure, in an uplink interference subframe of an intra-frequency neighboring small cell base station, the same-frequency neighbor small cell base station. a signal receiving power of the downlink reference signal; the scheduling processing unit is configured to calculate an expected transmit power of the scheduling terminal according to the signal received power measured by the information acquiring unit; and determine, according to the expected transmit power, The uplink transmit function of the scheduling terminal The scheduling execution unit is configured to notify the scheduling terminal of the uplink transmit power determined by the scheduling processing unit, so that the scheduling terminal sends uplink data by using the uplink transmit power.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation, the scheduling processing unit is specifically used to determine an uplink transmit power of the scheduling terminal according to the expected transmit power. If the expected transmit power is less than the maximum uplink transmit power of the scheduling terminal, determining the expected transmit power as the uplink transmit power of the scheduling terminal.

With the second possible implementation of the second aspect, in a third possible implementation, the scheduling processing unit is further configured to: at the scheduling terminal, the small cell base station, from at least two to-be-selected terminals When the selection is determined, if there are at least two to-be-selected terminals whose expected transmission power is smaller than the maximum uplink transmission power of the to-be-selected terminal, selecting the minimum expected transmission power in the at least two to-be-selected terminals The terminal to be selected is used as the scheduling terminal.

With reference to the first possible implementation manner of the second aspect, in a fourth possible implementation, the scheduling processing unit, when determining an uplink transmit power of the scheduling terminal according to the expected transmit power, is specifically used If the expected transmit power is greater than or equal to the maximum uplink transmit power of the scheduling terminal, determining that the maximum uplink transmit power is used as the uplink transmit power of the scheduling terminal; the scheduling execution unit is further configured to notify the The scheduling terminal does not send uplink data on the resource unit where the downlink reference signal of the intra-frequency neighbor small cell base station is located.

With the fourth possible implementation of the second aspect, in a fifth possible implementation, the scheduling execution unit is further configured to determine, at the scheduling processing unit, the maximum uplink transmit power as the scheduling After the uplink transmit power of the terminal, the uplink reference signal pattern of the scheduling terminal is notified to the same-frequency neighbor small cell base station, so that the same-frequency neighbor small cell base station selects to receive the uplink reference signal according to the uplink reference signal pattern. The neighboring terminal of the uplink reference signal is less than the threshold, and the neighboring terminal is the terminal served by the intra-frequency neighboring small cell base station.

With the first possible implementation of the second aspect, in a sixth possible implementation, the scheduling execution unit is further configured to determine, at the scheduling processing unit, that the expected transmit power is greater than or equal to the scheduling When the maximum uplink transmit power of the terminal is used, the same-frequency neighbor small cell base station is notified, and the power of the downlink-frequency small cell base station to transmit downlink data is less than or equal to the critical power; the critical power is equal to the same-frequency neighbor small cell a transmit power of a downlink reference signal of the base station minus a power difference, the power difference being equal to the same-frequency neighbor acceptable to the small cell base station The difference between the maximum signal received power of the small cell base station and the received power of the signal.

With reference to the second aspect, in a seventh possible implementation, the information acquiring unit is specifically configured to measure a signal arrival angle of a downlink reference signal of the same-frequency neighboring small cell base station; Determining, according to the signal arrival angle measured by the information acquiring unit, a beamforming direction angle of the scheduling terminal, where the beamforming direction angle and the signal arrival angle satisfy a distance threshold; the scheduling execution unit Specifically, the scheduling terminal corresponding to the beamforming direction angle is scheduled.

With the seventh possible implementation of the second aspect, in an eighth possible implementation, the scheduling execution unit is further configured to: after the information acquiring unit measures the signal arrival angle of the downlink reference signal, And the same-frequency neighbor small cell base station is notified to the same-frequency neighbor small cell base station, so that the same-frequency neighbor small cell base station selects a target neighbor terminal to perform scheduling according to the arrival angle indication information, where The target neighbor terminal is a terminal served by the intra-frequency neighbor small cell base station, and the beamforming direction angle of the target neighbor terminal and the signal arrival angle satisfy a distance threshold.

With reference to the eighth possible implementation of the second aspect, in the ninth possible implementation manner, the angle of arrival indication information includes: the signal arrival angle or a precoding matrix indication.

With reference to the second aspect, in a tenth possible implementation manner, the information acquiring unit is further configured to determine the same-frequency neighbor before measuring a feature measurement quantity of a downlink reference signal of the same-frequency neighbor small cell base station Small cell base station and uplink interference subframe.

With reference to the tenth possible implementation manner of the second aspect, in an eleventh possible implementation manner, the information acquiring unit, when determining the same-frequency neighbor small cell base station and an uplink interference subframe, specifically If the small cell base station parses the broadcast message of another base station, and obtains the cell identifier and the uplink and downlink ratio included in the broadcast message, determining that the another base station is the same-frequency neighbor small cell base station; The uplink and downlink ratio determines the uplink interference subframe.

With reference to the tenth possible implementation manner of the second aspect, in a twelfth possible implementation manner, the information acquiring unit, when determining the same-frequency neighbor small cell base station and an uplink interference subframe, specifically The signal receiving power of the downlink reference signal of another base station is detected in the uplink subframe of the base station, and if the signal receiving power is greater than or equal to the preset threshold, determining that the another base station is the same-frequency neighbor a cell base station, and the uplink subframe is the uplink interference subframe.

In a third aspect, a base station is provided, including:

a receiver, configured to receive an uplink interference subframe with the same-frequency neighbor small cell base station; a processor, configured to measure, in the uplink interference subframe received by the receiver, a feature measurement quantity of a downlink reference signal of the same-frequency neighbor small cell base station; and determine, according to the feature measurement quantity, a scheduling terminal Scheduling information; and scheduling the scheduling terminal according to the scheduling information.

With reference to the third aspect, in a first possible implementation manner, the processor is specifically configured to measure, in an uplink interference subframe of an intra-frequency neighboring small cell base station, a downlink reference of the same-frequency neighbor small cell base station a signal received power of the signal; calculating an expected transmit power of the scheduling terminal according to the received power of the signal; and determining an uplink transmit power of the scheduling terminal according to the expected transmit power; the base station further comprising a transmitter, configured to: Notifying the scheduling terminal by the uplink transmit power determined by the processor, so that the scheduling terminal sends uplink data by using the uplink transmit power.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner, the processor is specifically used to determine an uplink transmit power of the scheduling terminal according to the expected transmit power. The expected transmit power is less than the maximum uplink transmit power of the scheduling terminal, and then determining the expected transmit power as the uplink transmit power of the scheduling terminal.

With the second possible implementation of the third aspect, in a third possible implementation, the processor is further configured to: in the scheduling terminal, the small cell base station, from at least two to-be-selected terminals And selecting, if there is at least two to-be-selected terminals whose expected transmit power is smaller than the maximum uplink transmit power of the to-be-selected terminal, selecting the minimum expected transmit power of the at least two to-be-selected terminals The terminal is selected as the scheduling terminal.

With reference to the first possible implementation manner of the third aspect, in a fourth possible implementation, the processor, when determining, according to the expected transmit power, the uplink transmit power of the scheduling terminal, The expected transmit power is greater than or equal to the maximum uplink transmit power of the scheduling terminal, and then determining the maximum uplink transmit power as the uplink transmit power of the scheduling terminal; the transmitter is further configured to notify the scheduling terminal And not transmitting uplink data on a resource unit where the downlink reference signal of the same-frequency neighbor small cell base station is located.

With the fourth possible implementation of the third aspect, in a fifth possible implementation, the transmitter is further configured to determine, at the processor, the maximum uplink transmit power as the scheduling terminal. After the uplink transmit power, the uplink reference signal pattern of the scheduling terminal is notified to the same-frequency neighbor small cell base station, so that the same-frequency neighbor small cell base station selects to receive the uplink reference according to the uplink reference signal pattern. The signal power of the signal is less than the neighbor of the threshold In the terminal scheduling, the neighbor terminal is a terminal served by the same-frequency neighbor small cell base station.

With the first possible implementation of the third aspect, in a sixth possible implementation, the transmitter is further configured to determine, at the processor, that the expected transmit power is greater than or equal to that of the scheduling terminal. When the maximum uplink transmit power is received, the same-frequency neighbor small cell base station is notified, and the power of the downlink-frequency small cell base station to transmit downlink data is less than or equal to the critical power; the critical power is equal to the same-frequency neighbor small cell base station The transmit power of the downlink reference signal is subtracted from the power difference, and the power difference is equal to a difference between the maximum signal received power of the intra-frequency neighbor small cell base station and the received power of the signal that the small cell base station can accept.

With reference to the third aspect, in a seventh possible implementation, the processor is specifically configured to measure a signal arrival angle of a downlink reference signal of the same-frequency neighboring small cell base station, and determine, according to the signal arrival angle, Scheduling a beamforming direction angle of the terminal, the beamforming direction angle and the signal arrival angle satisfying a distance threshold; and scheduling the scheduling terminal corresponding to the beamforming direction angle.

In conjunction with the seventh possible implementation of the third aspect, in an eighth possible implementation, the apparatus further includes a transmitter, where the transmitter is configured to: after the processor measures the signal arrival angle of the downlink reference signal And the same-frequency neighbor small cell base station is notified to the same-frequency neighbor small cell base station, so that the same-frequency neighbor small cell base station selects a target neighbor terminal to perform scheduling according to the arrival angle indication information, where The target neighbor terminal is a terminal served by the intra-frequency neighbor small cell base station, and the beamforming direction angle of the target neighbor terminal and the signal arrival angle satisfy a distance threshold.

With reference to the eighth possible implementation manner of the third aspect, in the ninth possible implementation manner, the angle of arrival indication information includes: the signal arrival angle or a precoding matrix indication.

With reference to the third aspect, in a tenth possible implementation, the processor is further configured to determine that the same-frequency neighbor is small before measuring a feature measurement quantity of a downlink reference signal of the same-frequency neighbor small cell base station Cell base station and uplink interference subframe.

With reference to the tenth possible implementation manner of the third aspect, in an eleventh possible implementation, the determining, when determining the intra-frequency neighbor small cell base station and the uplink interference subframe, is specifically used to If the small cell base station parses the broadcast message of the other base station, and obtains the cell identifier and the uplink and downlink ratio included in the broadcast message, determining that the another base station is the same-frequency neighbor small cell base station; The uplink and downlink ratios are determined to determine the uplink interference subframe.

Combining the tenth possible implementation of the third aspect, in the twelfth possible implementation The processor, when determining the intra-frequency neighbor small cell base station and the uplink interference subframe, is specifically configured to detect a signal receiving power of a downlink reference signal of another base station in its own uplink subframe, if The signal receiving power is greater than or equal to the preset threshold, and determining that the another base station is the same-frequency neighbor small cell base station, and the uplink subframe is the uplink interference subframe.

In the above solution, the small cell base station measures the feature measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station in the uplink interference subframe of the same-frequency neighbor small cell base station, and determines the data according to the feature measurement quantity to schedule the terminal. The scheduling information enables the interference between the intra-frequency small cell base stations to be reduced according to the characteristic measurement amount. DRAWINGS

FIG. 1 is a schematic diagram of an optional application scenario of an interference processing method according to an embodiment of the present invention; FIG. 2 is a schematic flowchart of an interference processing method according to an embodiment of the present invention;

3 is a schematic flowchart of another embodiment of an interference processing method according to the present invention;

4 is a schematic diagram of an upstream puncturing in another embodiment of an interference processing method according to the present invention; FIG. 5 is a schematic flowchart of still another embodiment of an interference processing method according to the present invention;

6 is a schematic diagram of an orientation of still another embodiment of an interference processing method according to the present invention;

7 is a schematic structural diagram of an embodiment of a base station according to the present invention;

8 is a schematic structural diagram of an entity of an embodiment of a base station according to the present invention;

FIG. 9 is a schematic structural diagram of another entity of a base station according to the present invention. detailed description

FIG. 1 is an exemplary application scenario of an embodiment of an interference processing method according to the present invention. FIG. 1 is a heterogeneous scenario in which a macro base station (Macro) has a coverage area. Multiple small cell base stations with smaller coverage; if there are small cell base stations of the same frequency among the small cell base stations, there may be interference between small cell base stations or terminals in small cells covered by small cell base stations. Interference between them, which affects the communication of small cells. The interference processing method provided in the embodiment of the present invention can reduce the interference between the small-cell base stations in the same-frequency scenario, so that the dynamic TDD ratio of the small cells in the heterogeneous scenario can be supported in the heterogeneous scenario shown in FIG. And reducing interference caused by different uplink and downlink ratios between small cells.

Embodiment 1 2 is a schematic flowchart of an embodiment of an interference processing method according to the present invention. The method may be performed by a small cell base station. As shown in FIG. 2, the method may include:

201. The small cell base station measures, in an uplink interference subframe of the same-frequency neighbor small cell base station, a feature measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station;

If there is interference between the small cell base station and the neighboring small cell base station of the same frequency, then in the uplink subframe of the small cell base station, the downlink reference signal of the neighbor small cell base station is also received, and the above uplink sub-substation can be A frame is called an uplink interference subframe. The small cell base station may measure the feature measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station in the uplink interference subframe. The characteristic measurement quantity includes, for example, the signal receiving power of the downlink reference signal, or the signal arrival angle of the downlink reference signal, etc., and different feature measurement quantities may adopt different interference processing modes, which will be specifically described in the following embodiments.

Further, the small cell base station may determine its co-frequency neighbor small cell base station and the uplink interference subframe before measuring the feature measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station. Because there may be multiple small cell base stations around the small cell base station, which small cell base station can be called its neighbor small cell base station, and which uplink subframe is interfered by the downlink reference signal of the neighbor small cell base station, can be A variety of alternative methods are available for the assay.

For example, it is assumed that each small cell base station is transmitting a broadcast message, and the broadcast message includes a cell identifier of the cell under the base station and a configured uplink-downlink ratio; then the small cell base station can parse the broadcast message of another base station, if it can be correctly parsed And obtaining, by the broadcast message, the cell identifier and the uplink-downlink ratio included in the broadcast message, indicating that the another base station is a co-frequency neighbor small cell base station. And, the small cell base station can determine the uplink interference subframe according to the uplink and downlink ratio.

For another example, the small cell base station may detect the signal receiving power of the downlink reference signal of another base station in its own uplink subframe, and if the signal receiving power is greater than or equal to the preset threshold, determine that another base station is the The same frequency neighboring small cell base station, and the uplink subframe is the uplink interference subframe.

202. The small cell base station determines, according to the characteristic measurement quantity, scheduling information used for scheduling the terminal. The feature measurement quantity in 201 may be: the signal receiving power of the downlink reference signal, or the downlink reference, as described above. The signal arrival angle of the signal, etc., then the different feature measurements, the scheduling information used in this step may also be different.

For example, if the feature measurement quantity acquired by the small cell base station is the downlink of the same-frequency neighbor small cell base station The signal receiving power of the reference signal, the small cell base station may calculate the expected transmit power of the scheduling terminal to be scheduled by the small cell base station according to the received power of the signal; the expected transmit power refers to, to reduce the neighbor small cell base station Interference, the uplink transmit power that the scheduling terminal needs to adopt. The small cell base station further determines an uplink transmit power of the scheduling terminal according to the expected transmit power. Because the scheduling terminal has its maximum uplink transmit power, the expected transmit power needs to be compared with the maximum uplink transmit power to determine the final Uplink transmit power. That is, in this manner, the row transmit power of the scheduling terminal is the scheduling information obtained by the small cell base station.

Optionally, the comparing the expected transmit power with the maximum uplink transmit power to determine a final uplink transmit power may also include multiple scenarios.

In one case, if the expected transmit power is less than the maximum uplink transmit power of the scheduling terminal, it is determined that the expected transmit power is used as the uplink transmit power of the scheduling terminal. Further, the scheduling terminal may be that the small cell base station selects from at least two to-be-selected terminals; if there is at least two to-be-selected terminals whose expected transmission power is smaller than the maximum uplink transmission power of the to-be-selected terminal, Then, the small cell base station may select, as the scheduling terminal, the to-be-selected terminal that has the smallest expected transmit power among the at least two to-be-selected terminals.

In another case, if the expected transmit power is greater than or equal to the maximum uplink transmit power of the scheduling terminal, determining the maximum uplink transmit power as the uplink transmit power of the scheduling terminal. At this time, the small cell base station may notify the scheduling terminal that the uplink data is not transmitted on the resource unit where the downlink reference signal of the same-frequency neighbor small cell base station is located. And the small cell base station may further notify the same-frequency neighbor small cell base station of the uplink reference signal pattern of the scheduling terminal, so that the same-frequency neighbor small cell base station selects to receive the uplink reference according to the uplink reference signal pattern. The neighboring terminal of the signal is less than the threshold of the neighboring terminal, and the neighboring terminal is the terminal served by the same-frequency neighboring small cell base station.

Optionally, in order to reduce interference of the neighboring small cell base station, the small cell base station in this embodiment may further notify the same-frequency neighbor small cell base station, and request the same-frequency neighbor small cell base station to send downlink data power less than or equal to a critical value. The power is equal to the transmit power of the downlink reference signal of the same-frequency neighboring small cell base station minus the power difference, and the power difference is equal to the maximum signal received power of the same-frequency neighbor small cell base station that the small cell base station can accept The signal receives a difference in power.

For another example, if the feature measurement quantity acquired by the small cell base station is the signal arrival angle of the downlink reference signal of the same-frequency neighbor small cell base station, the small cell base station may determine the tone according to the signal arrival angle. The beamforming direction angle of the terminal, the beamforming direction angle and the signal arrival angle satisfying a distance threshold. That is, the small cell base station needs to select a terminal that is far away from the neighboring small cell base station to perform scheduling, so as to reduce the interference of the neighboring small cell base station, and the scheduling information obtained by the small cell base station is the beamforming direction angle.

Optionally, the small cell base station may notify the same-frequency neighbor small cell base station with the angle of arrival indication information used to indicate the signal arrival angle, so that the same-frequency neighbor small cell base station selects according to the arrival angle indication information. The target neighboring terminal performs scheduling, and the target neighboring terminal is a terminal served by the intra-frequency neighboring small cell base station, and the beamforming direction angle of the target neighboring terminal and the signal arrival angle satisfy a distance threshold. For example, the angle of arrival indication information may include: the signal arrival angle or a precoding matrix indication.

203. The small cell base station schedules the scheduling terminal according to the scheduling information.

For example, when the scheduling information is the uplink transmit power of the scheduling terminal, the small cell base station notifies the scheduling terminal of the uplink transmit power, so that the scheduling terminal can use the uplink transmit power to send the uplink data. The uplink transmit power is calculated by the small cell base station according to the signal received power of the downlink reference signal of the neighboring small cell base station, and is the transmit power calculated to reduce the interference of the neighbor small cell base station, so the scheduling terminal performs the power according to the power. The uplink will effectively reduce the interference.

For example, when the scheduling information is the beamforming direction angle of the scheduling terminal, the small cell base station may select the scheduling terminal corresponding to the beamforming direction angle for scheduling. Since the beamforming direction angle is calculated by the small cell base station according to the signal arrival angle of the downlink reference signal of the same-frequency neighbor small cell base station, it is the terminal that is far away from the signal arrival direction to reduce the interference of the neighbor small cell base station. The scheduling is performed, so selecting the scheduling terminal corresponding to the beamforming direction angle for scheduling will effectively reduce the interference of the neighboring small cell base station.

In the following, the feature measurement measured by the small cell base station is the signal receiving power of the downlink reference signal of the same-frequency neighbor small cell base station and the signal arrival angle of the downlink reference signal, respectively, in the two cases. The interference processing method will be described.

Embodiment 2

3 is a schematic flowchart of another embodiment of an interference processing method according to the present invention. In this embodiment, a feature measurement quantity measured by a small cell base station in a TDD mode is a signal received power, and an uplink transmit power of a scheduling terminal is calculated according to the received power of the signal. . As shown in FIG. 3, the method may include:

301. The small cell base station measures the same in the uplink interference subframe of the same-frequency neighbor small cell base station. Signal receiving power of a downlink reference signal of a frequency neighboring small cell base station;

The downlink reference signal may be, for example, a Cell Specific Reference Signal (CRS). In a specific implementation, the small cell base station may detect, in its uplink subframe, the signal receiving power of the downlink reference signal of the same-frequency neighboring small cell base station, that is, the reference signal receiving power (RSRP), and the RSRP may indicate the base station. The level of interference between the levels can be expressed in lot. If the small cell base station detects that the RSRP is greater than the preset threshold, it can be considered that the neighbor small cell base station transmits the downlink in the uplink subframe, that is, the uplink subframe is considered as the uplink interference subframe.

Optionally, the small cell base station can also learn its co-frequency neighbor small cell base station and uplink interference subframe by using other means. Whether the neighboring small cell base station is related to the transmit power of the downlink reference signal, if the downlink reference signal transmit power of the base station changes, the neighbor area also changes. The small cell base station learns the same-frequency neighbor small cell base station and the uplink interference subframe as follows:

For example, the small cell base station can obtain the cell identity of the neighbor small cell base station and the current uplink and downlink ratio in the macro cell range by using the macro base station of the upper cell. Specifically, it can be assumed that an ideal optical fiber exists between the small cell base station and the macro base station to which it belongs, and the information interaction delay between the small cell base station and the macro base station is small, and may be within 100 ms.

The neighboring small cell base station may be divided by a geographical location, and the small cell base station may estimate an area where the current cell interferes with other cells according to the path loss formula, and then notify the macro base station of the area, and the macro base station uses the base station in the area as The neighbor base station notifies the small cell base station. For example, the path loss formula is as follows: Pr=Pt-PL, where Pt is the transmit power (in dbm), PL is the path loss (in db), the PL is a function of the coverage radius, and Pr is the received power. (The unit is dbm). Assuming that Pr is greater than the preset threshold, it is considered that there is interference, and the coverage radius at this time can be calculated. When other small cell base stations are located within the coverage radius, it is considered to be a neighbor small cell base station. The macro base station is notified to the macro base station, and the macro base station notifies the small cell base station of the cell identity of the neighbor small cell base station located in the coverage radius area in the macro cell and the current uplink and downlink ratio. The small cell base station can determine the location of the uplink interference subframe according to the current uplink and downlink ratio.

For example, the cell identifiers of the neighboring small cell base stations and the current uplink and downlink ratios can also be obtained through the air interface signaling between the base stations. Specifically, it can be assumed that each base station transmits the respective cell identifiers and the current uplink and downlink ratios with the same power as the downlink reference signals. If the small cell base station parses the broadcast message of another base station, the cell identifier included in the broadcast message and the upper and lower The row ratio determines that the other base station is a co-frequency neighbor small cell base station. The small cell base station determines the uplink interference subframe according to the uplink and downlink ratio. The interaction delay of such an air interface channel is small and can be within 10 ms.

For example, the base station can use the same synchronization channel (Primary Synchronization Signal, PSS) and Secondary Synchronization Signals (SSS) to obtain the cell physical layer identifier. Further, the system information (SIB) of the neighboring base station is solved to obtain the current uplink and downlink ratio. Since PSS and SSS are currently available every 10ms, and SIB is available every 640ms, this interaction delay is relatively large. The small cell base station determines the location of the uplink interference subframe according to the uplink and downlink ratio.

302. The small cell base station calculates an expected transmit power of the scheduling terminal according to a signal received power of the downlink reference signal.

In order to compensate for the inter-base station interference, that is, the interference level lot, the small cell base station may calculate the uplink transmit power of the scheduled terminal (which may be referred to as a scheduling terminal) according to the signal received power, and the embodiment will receive according to the signal. The power calculated by the power is called the expected transmit power.

It can be calculated by the following formula: P = min (Pmax, target_SINR + PL + (N + Iot) B ) , where Pmax is the maximum uplink transmit power of the terminal, for example 23dbm; target_SINR is the target SINR level, between [_5db, 30db] Value, according to the target SINR level required by the terminal, the code rate used by the corresponding terminal. PL is the path loss of the terminal signal to the serving base station, and N is the noise density, lot is the interference level (ie RSRP obtained in 301), B is the bandwidth, and (N+Iot) B is the energy of the interference and noise. Sometimes a scale factor is introduced before the PL in order to balance the edge and center terminal compensation for path loss.

303. The small cell base station determines, according to the expected transmit power, an uplink transmit power of the scheduling terminal.

For example, if the expected transmit power is less than the maximum uplink transmit power of the scheduling terminal, it is determined that the expected transmit power is used as the uplink transmit power of the scheduling terminal.

Further, if the scheduling terminal is a small cell base station selected from at least two to-be-selected terminals, and there are at least two to-be-selected terminals whose expected transmission power is smaller than the maximum uplink transmission power of the to-be-selected terminal, the small cell The base station may select, as the scheduling terminal, the to-be-selected terminal that has the smallest expected transmit power among the at least two to-be-selected terminals.

For another example, if the expected transmit power is greater than or equal to the maximum uplink of the scheduling terminal Transmit power, then determine the maximum uplink transmit power as the uplink transmit power of the scheduling terminal.

304. The small cell base station notifies the scheduling terminal of the determined uplink transmit power, so that the scheduling terminal sends the uplink data by using the uplink transmit power.

If the uplink transmit power of the scheduling terminal is the maximum uplink transmit power, the small cell base station may also notify the scheduling terminal that the resource element (Resource Element, referred to as RE) where the downlink reference signal of the same-frequency neighbor small cell base station is located The uplink data is not sent on, so as to prevent the data on the RE from being interfered by the downlink reference signal of the neighboring small cell base station.

Taking the uplink transmission in LTE as an example, referring to FIG. 4, FIG. 4 is a schematic diagram of an uplink puncturing in another embodiment of the interference processing method according to the present invention. A time slot contains ^^* symbols, including in each symbol! ^^^ ⁵ resource blocks, each of which is a resource unit, including a total of 12 ^Ν ^"* resource units. Assume that the left slash in the third symbol is the uplink reference signal as the position. The RE of the neighboring downlink reference signal represented by the neighbor. The resource that can be used to transmit data in one slot is 12 1 ) - ^N where ^^ ^ represents the number of REs occupied by the neighbor downlink reference signal, as shown in Figure 4 For example, ^N ^ = 4.

Optionally, in order to further reduce the interference of the neighboring small cell base station, the small cell base station in this embodiment determines that the uplink transmit power is the maximum uplink transmit power when the expected transmit power is greater than or equal to the maximum uplink transmit power of the scheduling terminal. And notifying the terminal that the uplink data is not transmitted on the RE where the downlink reference signal is located, and notifying the same-frequency neighbor small cell base station, and requesting the same-frequency neighbor small cell base station to send downlink data with power less than or equal to the critical power.

The critical power is equal to the transmit power of the downlink reference signal of the same-frequency neighbor small cell base station minus the power difference, and the power difference is equal to the maximum signal reception of the same-frequency neighbor small cell base station that the small cell base station can accept The difference between the power and the received power of the signal. That is, the power of the downlink data transmitted by the neighboring small cell base station cannot exceed Ρ - Δ lot ( dbm) of the downlink reference signal power, where Δ lot = (Pmax - target_SINR - PL - NB) / B - Iot.

Optionally, 305 and subsequent steps may be further performed, so that the neighbor small cell base station can select a neighbor terminal that is far away from the terminal scheduled by the small cell base station to perform scheduling, and further reduce the terminal and the neighbor small cell under the small cell base station. Interference between terminals under the base station.

305. The small cell base station notifies the same-frequency neighbor small cell base station to the uplink reference signal pattern of the scheduling terminal that is prepared to be scheduled by the small cell base station;

The uplink reference signal may be a preamble sequence or a probe reference signal. Sounding Reference Signals (SRS), or other upstream reference signals.

306. The small cell base station notifies the scheduling terminal, and sends an uplink reference signal according to the determined uplink transmit power.

The determined uplink transmit power is the uplink transmit power determined in 304. The base station of the small cell informs the terminal to send an uplink reference signal that is notified to the neighbor small cell base station in 305 according to the uplink transmit power. In order to control the neighboring small cell base station to perform UE-UE measurement

307. The neighboring small cell base station notifies the terminal in the area to report the received strength of the received uplink reference signal according to the uplink reference signal pattern.

The same-frequency neighboring small-cell base station can notify the terminal in the area, and measure the receiving strength of the uplink reference signal transmitted by the terminal in the small cell base station of the execution entity of the embodiment, and instruct the same to report the received strength. Here, the terminals served by the intra-frequency neighbor small cell base station may be referred to as neighboring terminals.

308. The neighboring small cell base station selects a neighbor terminal scheduling that receives a signal strength of the uplink reference signal that is less than a threshold.

The neighboring small cell base station selects a terminal that measures the uplink reference signal to perform scheduling, and the terminal is far away from the terminal of the small cell base station, so as to reduce interference between the terminals caused by different uplink and downlink ratios.

309. The neighboring small cell base station notifies the small cell base station, and subsequently schedules the terminal according to the determined uplink transmit power.

The neighboring small cell base station is equivalent to notifying the small cell base station to complete the negotiation in the present step. In the subsequent subframe, the neighbor small cell base station will perform scheduling according to the selected self-terminal with the smaller uplink reference signal, and reduce the terminal. Interference between the base stations and the small cell base station will notify the scheduling terminal under it to perform uplink transmission according to the determined uplink transmission power, thereby reducing interference between the base stations.

In the interference processing method of the embodiment, the small cell base station calculates the uplink transmit power of the scheduling terminal according to the signal received power of the downlink reference signal of the neighbor small cell base station, and controls the power of transmitting the downlink data by the neighbor small cell base station. The base station interference between the small cell base stations can be reduced. In this embodiment, the neighbor small cell base station is further notified to select the neighbor terminal that is away from the small cell scheduling terminal for scheduling, and the terminal between the small cell base stations is also reduced. Interference.

Embodiment 3

FIG. 5 is a schematic flowchart of still another embodiment of an interference processing method according to the present invention. In this embodiment, a feature measurement quantity measured by a small cell base station adopting a TDD method is a signal arrival angle, and a beamforming direction of the scheduling terminal is calculated according to the signal arrival angle. The angle, thereby determining the terminal to be scheduled corresponding to the beamforming direction angle. As shown in FIG. 5, the method may include:

501. The small cell base station measures, in an uplink interference subframe of the same-frequency neighbor small cell base station, a signal arrival angle of the downlink reference signal of the same-frequency neighbor small cell base station;

The downlink reference signal may be, for example, a CRS. In a specific implementation, the small cell base station may detect the signal arrival angle of the downlink reference signal of the same-frequency neighbor small cell base station in its uplink subframe, and determine the orientation of the neighbor small cell base station in its own direction by the signal arrival angle.

Referring to FIG. 6, FIG. 6 is a schematic diagram showing the orientation of another embodiment of the interference processing method of the present invention. The signal arrival angle of the downlink reference signal of the neighbor small cell base station is j l , that is, the direction angle between the neighbor small cell base station and the small cell base station is j1.

Optionally, before the measurement signal arrival angle, if the small cell base station has not determined the location of the uplink interference subframe, the signal receiving power of the downlink reference signal of the same-frequency neighbor small cell base station may be detected; if the power is greater than a preset threshold The value is considered to be the uplink interference subframe, and the above-mentioned signal arrival angle is further estimated. The small cell base station can also learn the same-frequency neighbor small cell base station and the uplink interference subframe by other means, and the small cell base station learns the same-frequency neighbor small cell base station and the uplink interference subframe, and the manners described in the second embodiment. For the same, refer to the second embodiment for details.

502. The small cell base station determines a beamforming direction angle of the scheduling terminal according to a signal arrival angle of the downlink reference signal, where the beamforming direction angle and the signal arrival angle satisfy a distance threshold value;

The small cell base station may select, according to the signal arrival angle, a terminal in the small cell that is away from the signal arrival angle direction, that is, the beamforming direction angle j2 and the measured signal arrival angle jl satisfy the remote threshold value, which is consistent with | j2+180° - jl | <Thl, where Thl is the threshold value, where jl, j2, Thl units are angles, and can also be converted into radians, | j2 ' +π - jl, | Thl, , where Thl, =TT *Thl/180. , §卩 jl, , j2, , Thl ' units are angles. The small cell base station selects the terminal corresponding to the beamforming direction angle for scheduling, and is called a scheduling terminal.

Optionally, the small cell base station may also perform the following 503 and subsequent steps. 503. The small cell base station notifies the same-frequency neighbor small cell base station to the arrival angle indication information used to indicate the signal arrival angle.

The small cell base station may further notify the same-frequency neighbor small cell base station with the angle of arrival indication information indicating the arrival angle of the signal, so that the neighbor small cell base station also selects the neighboring terminal that is far away from the signal arrival angle direction for scheduling.

For example, the arrival angle indication information may include: the signal arrival angle, or, since the actual system may implement beamforming in a codebook-based manner, the neighbor base station may be notified of a precoding matrix indicator (Precode Matrix Index, Abbreviation: PMI).

504. The neighboring small cell base station selects a target neighbor terminal to perform scheduling according to the arrival angle indication information, where the target neighbor terminal is a terminal served by the same-frequency neighbor small cell base station, and a beamforming direction angle of the target neighbor terminal is The signal arrival angle satisfies the threshold.

The beamforming direction angle j3 and the signal arrival angle j1 of the target neighbor terminal also satisfy the condition of being away from the threshold value, for example, I j3 - j l | < Thl, where Thl is the threshold value, and the same can be used. Expressed as a radians relationship.

505. The small cell base station and the neighbor small cell base station confirm that the negotiation is completed.

The neighboring small cell base station is equivalent to notifying the small cell base station to complete the negotiation in this step, that is, the small cell base station selects the scheduling terminal shown in FIG. 6 to perform scheduling, and the neighbor small cell base station selects the target neighbor terminal to perform scheduling, which is Both terminals are terminals that are far from the direction of arrival of the signal. In subsequent subframes, the small cell base station and the neighbor small cell base station will be scheduled according to the terminal they select.

In the interference processing method of this embodiment, the small cell base station calculates the terminal to be scheduled according to the signal arrival angle of the downlink reference signal of the neighbor small cell base station, and can reduce the interference between the small cell base stations.

Embodiment 4

FIG. 7 is a schematic structural diagram of an embodiment of a base station according to the present invention. The base station may be a small cell base station, and performs a method according to any embodiment of the present invention. As shown in FIG. 7, the base station may include: an information acquisition unit 71, a scheduling processing unit 72, and a scheduling execution unit 73;

The information acquiring unit 71 is configured to measure, in an uplink interference subframe of the same-frequency neighbor small cell base station, a feature measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station;

The scheduling processing unit 72 is configured to determine, according to the feature measurement quantity measured by the information acquiring unit, scheduling information used by the scheduling terminal; The scheduling execution unit 73 is configured to schedule the scheduling terminal according to the scheduling information determined by the scheduling processing unit.

Further, the information acquiring unit 71 is specifically configured to measure a signal receiving power of the downlink reference signal of the same-frequency neighbor small cell base station in an uplink interference subframe of the same-frequency neighbor small cell base station;

The scheduling processing unit 72 is specifically configured to calculate an expected transmit power of the scheduling terminal according to the signal received power measured by the information acquiring unit, and determine an uplink transmit power of the scheduling terminal according to the expected transmit power. ;

The scheduling execution unit 73 is specifically configured to notify the scheduling terminal of the uplink transmit power determined by the scheduling processing unit, so that the scheduling terminal sends uplink data by using the uplink transmit power.

Further, the scheduling processing unit 72 is configured to: when the uplink transmit power of the scheduling terminal is determined according to the expected transmit power, specifically, if the expected transmit power is less than a maximum uplink transmit power of the scheduling terminal, Determining the expected transmit power as the uplink transmit power of the scheduling terminal.

Further, the scheduling processing unit 72 is further configured to: when the scheduling terminal is that the small cell base station selects from at least two to-be-selected terminals, if the expected transmit power is less than the to-be-selected terminal The at least two to-be-selected terminals of the maximum uplink transmit power are selected, and the to-be-selected terminal with the smallest expected transmit power among the at least two to-be-selected terminals is selected as the scheduling terminal.

Further, the scheduling processing unit 72 is configured to: when the uplink transmit power of the scheduling terminal is determined according to the expected transmit power, specifically, if the expected transmit power is greater than or equal to a maximum uplink transmit power of the scheduling terminal. Determining, using the maximum uplink transmit power as the uplink transmit power of the scheduling terminal;

The scheduling execution unit 73 is further configured to notify the scheduling terminal that the uplink data is not sent on the resource unit where the downlink reference signal of the same-frequency neighbor small cell base station is located.

Further, the scheduling execution unit 73 is further configured to: after the scheduling processing unit determines that the maximum uplink transmit power is used as the uplink transmit power of the scheduling terminal, notify the uplink reference signal pattern of the scheduling terminal And the same-frequency neighboring small-cell base station, so that the same-frequency neighboring small-cell base station selects, according to the uplink reference signal pattern, the neighboring terminal that receives the uplink reference signal whose signal power is less than a threshold, the neighbor The terminal is the same frequency neighbor A terminal that serves a small cell base station. In this way, the neighboring small cell base station can select a neighboring terminal that is far away from the terminal scheduled by the small cell base station to perform scheduling, and further reduce interference between the terminal under the small cell base station and the terminal under the neighbor small cell base station.

Further, the scheduling execution unit 73 is further configured to: when the scheduling processing unit determines that the expected transmit power is greater than or equal to a maximum uplink transmit power of the scheduling terminal, notify the same-frequency neighbor small cell base station, And the power of the downlink frequency reference base station of the same-frequency neighbor small cell base station is less than or equal to the critical power; the critical power is equal to the transmit power of the downlink reference signal of the same-frequency neighbor small cell base station minus the power difference, where the power difference is equal to The difference between the maximum signal received power of the intra-frequency neighbor small cell base station and the received power of the signal that the small cell base station can accept.

Further, the information acquiring unit 71 is specifically configured to measure a signal arrival angle of a downlink reference signal of the same-frequency neighbor small cell base station;

The scheduling processing unit 72 is specifically configured to determine a beamforming direction angle of the scheduling terminal according to the signal arrival angle measured by the information acquiring unit, where the beamforming direction angle and the signal arrival angle satisfy a distance Threshold value

The scheduling execution unit 73 is specifically configured to schedule the scheduling terminal corresponding to the beamforming direction angle.

Further, the scheduling execution unit 73 is further configured to: after the information acquiring unit measures the signal arrival angle of the downlink reference signal, notify the angle of arrival indication information used to indicate the signal arrival angle And the same-frequency neighboring small-cell base station, so that the same-frequency neighboring small-cell base station selects a target neighboring terminal to perform scheduling according to the arrival angle indication information, where the target neighboring terminal is a terminal served by the same-frequency neighboring small-cell base station, and The beamforming direction angle of the target neighbor terminal and the signal arrival angle satisfy a distance threshold.

Further, the arrival angle indication information includes: the signal arrival angle or a precoding matrix indication.

Further, the information acquiring unit 71 is further configured to determine the intra-frequency neighbor small cell base station and the uplink interference subframe before measuring the feature measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station.

Further, the information acquiring unit 71, when determining the intra-frequency neighbor small cell base station and the uplink interference subframe, is specifically configured to: if the small cell base station resolves a broadcast message of another base station, obtain the Determining the cell identifier and the uplink and downlink ratio included in the broadcast message, determining the other A base station is the same-frequency neighbor small cell base station; and determining the uplink interference subframe according to the uplink-downlink ratio.

Further, the information acquiring unit 71, when determining the intra-frequency neighbor small cell base station and the uplink interference subframe, specifically for detecting the downlink reference signal of another base station in its own uplink subframe The power, if the signal received power is greater than or equal to the preset threshold, determines that the another base station is the same-frequency neighbor small cell base station, and the uplink subframe is an uplink interference subframe.

The base station of this embodiment determines the feature measurement quantity of the downlink reference signal of the intra-frequency neighbor small cell base station by the information acquiring unit, and determines, by the scheduling processing unit, the scheduling information according to the feature measurement quantity, and the scheduling execution unit performs the scheduling information according to the scheduling information. The scheduling terminal performs scheduling, so that interference between the small-cell base stations of the same frequency can be reduced according to the feature measurement amount.

Embodiment 5

FIG. 8 is a schematic diagram of an entity structure of an embodiment of a base station according to the present invention. The base station may be a small cell base station, and performs a method according to any embodiment of the present invention. As shown in FIG. 8, the base station may include: a receiver 81 and a processor 82;

The receiver 81 is configured to receive an uplink interference subframe of the same-frequency neighboring small cell base station, and the processor 82 is configured to measure the same-frequency neighbor small cell base station in the uplink interference subframe received by the receiver. a feature measurement quantity of the downlink reference signal; determining scheduling information for scheduling the terminal according to the feature measurement quantity; and scheduling the scheduling terminal according to the scheduling information.

FIG. 9 is a schematic structural diagram of another embodiment of a base station according to the present invention. As shown in FIG. 9, on the basis of the structure shown in FIG. 8, the base station further includes a transmitter 83;

The processor 82 is configured to: in a uplink interference subframe of the same-frequency neighboring small cell base station, measure signal receiving power of the downlink reference signal of the same-frequency neighbor small cell base station; and calculate the scheduling according to the signal received power An expected transmit power of the terminal; and determining an uplink transmit power of the scheduling terminal according to the expected transmit power;

The transmitter 83 is configured to notify the scheduling terminal of the uplink transmit power determined by the processor, so that the scheduling terminal sends uplink data by using the uplink transmit power.

Further, the processor 82 is configured to: when the uplink transmit power of the scheduling terminal is determined according to the expected transmit power, specifically, if the expected transmit power is less than a maximum uplink transmit power of the scheduling terminal, determine The expected transmit power is used as the uplink transmission of the scheduling terminal Power.

Further, the processor 82 is further configured to: when the scheduling terminal is that the small cell base station selects from at least two to-be-selected terminals, if the expected transmit power is less than the maximum uplink of the to-be-selected terminal And selecting at least two to-be-selected terminals of the transmit power, and selecting, as the scheduling terminal, the to-be-selected terminal that has the smallest expected transmit power among the at least two to-be-selected terminals.

Further, when the processor 82 determines the uplink transmit power of the scheduling terminal according to the expected transmit power, specifically, if the expected transmit power is greater than or equal to the maximum uplink transmit power of the scheduling terminal, determining The maximum uplink transmit power is used as the uplink transmit power of the scheduling terminal, and the transmitter 83 is further configured to notify the scheduling terminal that the resource is not sent on the resource unit where the downlink reference signal of the same-frequency neighbor small cell base station is located. Upstream data.

Further, the transmitter 83 is further configured to: after the processor 82 determines that the maximum uplink transmit power is used as the uplink transmit power of the scheduling terminal, notify the same as the uplink reference signal pattern of the scheduling terminal. a neighboring small cell base station, so that the same-frequency neighboring small cell base station selects, according to the uplink reference signal pattern, a neighboring terminal that receives a signal strength of the uplink reference signal that is less than a threshold, where the neighbor terminal is The terminal serving the same-frequency neighbor small cell base station service.

Further, the transmitter 83 is further configured to: when the processor 82 determines that the expected transmit power is greater than or equal to a maximum uplink transmit power of the scheduling terminal, notify the same-frequency neighbor small cell base station, requesting the The power of the downlink data of the same-frequency neighboring small cell base station is less than or equal to the critical power; the critical power is equal to the transmit power of the downlink reference signal of the same-frequency neighbor small cell base station minus the power difference, and the power difference is equal to the small The difference between the maximum signal received power of the intra-frequency neighbor small cell base station and the received power of the signal that the cell base station can accept.

Further, the processor 82 is specifically configured to measure a signal arrival angle of the downlink reference signal of the same-frequency neighbor small cell base station; determine a beamforming direction angle of the scheduling terminal according to the signal arrival angle, and the beamforming The direction angle and the signal arrival angle satisfy a distance threshold; and the scheduling terminal corresponding to the beamforming direction angle is scheduled.

Further, the transmitter 83 is configured to, after the processing, 82, obtain the signal arrival angle of the downlink reference signal, notify the same-frequency neighbor that the angle of arrival indication information indicating the arrival angle of the signal is a cell base station, such that the intra-frequency neighboring small cell base station selects a target neighbor terminal to perform scheduling according to the arrival angle indication information, where the target neighbor terminal is a terminal served by the same-frequency neighbor small cell base station, and the target neighbor The beamforming direction angle of the terminal and the The signal arrival angle satisfies the threshold.

Further, the processor 82 is further configured to determine an intra-frequency neighbor small cell base station and an uplink interference subframe before measuring a feature measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station.

Further, when the processor 82 determines the intra-frequency neighbor small cell base station and the uplink interference subframe, the processor 82 is specifically configured to: if the small cell base station resolves the broadcast message of another base station, obtain the broadcast message. And determining, by the cell identifier and the uplink and downlink ratio, the another base station is the same-frequency neighbor small cell base station; determining the uplink interference subframe according to the uplink-downlink ratio.

Further, when determining the intra-frequency neighbor small cell base station and the uplink interference subframe, the processor 82 is specifically configured to detect a signal receiving power of the downlink reference signal of another base station in its own uplink subframe, if And determining that the another base station is the same-frequency neighbor small cell base station, and the uplink subframe is the uplink interference subframe.

The base station in this embodiment measures the feature measurement quantity of the downlink reference signal in the uplink interference subframe of the intra-frequency neighbor small cell base station received by the receiver, and determines the scheduling information according to the feature measurement quantity according to the scheduling. The information is scheduled for the scheduling terminal, so that the interference between the small-cell base stations of the same frequency can be reduced according to the feature measurement.

One of ordinary skill in the art will appreciate that all or a portion of the steps of implementing the various method embodiments described above can be accomplished by hardware associated with the program instructions. The aforementioned program can be stored in a computer readable storage medium. The program, when executed, performs the steps including the above-described method embodiments; and the foregoing storage medium includes: various media that can store program codes, such as ROM, RAM, disk or optical disk.

It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

Rights request

1. An interference processing method, characterized by including:

In the uplink interference subframe between the small cell base station and the same-frequency neighbor small cell base station, measure the characteristic measurement amount of the downlink reference signal of the same-frequency neighbor small cell base station;

The small cell base station determines scheduling information for scheduling terminals based on the characteristic measurement quantity, and schedules the scheduling terminals based on the scheduling information.

2. The method according to claim 1, characterized in that,

Measuring the characteristic measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station includes: measuring the signal received power of the downlink reference signal of the same-frequency neighbor small cell base station;

The small cell base station determines the scheduling information for scheduling the terminal based on the characteristic measurement quantity, including: the small cell base station calculates the expected transmission power of the scheduled terminal based on the signal received power; and based on the expectation The transmission power determines the uplink transmission power of the scheduling terminal; the scheduling of the scheduling terminal according to the scheduling information includes: the small cell base station notifies the scheduling terminal of the uplink transmission power, so that the The scheduling terminal uses the uplink transmit power to send uplink data.

3. The method according to claim 2, wherein the determining the uplink transmission power of the scheduled terminal according to the expected transmission power includes:

If the expected transmission power is less than the maximum uplink transmission power of the scheduling terminal, it is determined to use the expected transmission power as the uplink transmission power of the scheduling terminal.

4. The method according to claim 3, wherein the scheduling terminal is selected and determined by the small cell base station from at least two terminals to be selected;

If there are at least two terminals to be selected whose expected transmission power is less than the maximum uplink transmission power of the terminal to be selected, the scheduling terminal is selected and determined by the small cell base station from at least two terminals to be selected, including: Select the terminal to be selected with the smallest expected transmission power among the at least two terminals to be selected as the scheduled terminal.

5. The method according to claim 2, wherein the determining the uplink transmission power of the scheduled terminal according to the expected transmission power includes:

If the expected transmission power is greater than or equal to the maximum uplink transmission power of the scheduling terminal, then determine the maximum uplink transmission power as the uplink transmission power of the scheduling terminal; Scheduling the scheduling terminal according to the scheduling information further includes: the small cell base station notifying the scheduling terminal not to transmit uplink on the resource unit where the downlink reference signal of the same-frequency neighbor small cell base station is located. data.

6. The method according to claim 5, characterized in that, after the determining to use the maximum uplink transmission power as the uplink transmission power of the scheduled terminal, it further includes:

The small cell base station notifies the same-frequency neighbor small cell base station of the uplink reference signal pattern of the scheduled terminal, so that the same-frequency neighbor small cell base station selects and receives the uplink reference according to the uplink reference signal pattern. Neighbor terminals whose signal power is less than a threshold value are scheduled, and the neighbor terminals are terminals served by the same-frequency neighbor small cell base station.

7. The method according to claim 2, wherein if the expected transmission power is greater than or equal to the maximum uplink transmission power of the scheduled terminal, the method further includes:

The small cell base station notifies the same-frequency neighbor small cell base station and requests the same-frequency neighbor small cell base station to send downlink data with a power that is less than or equal to the critical power;

The critical power is equal to the transmission power of the downlink reference signal of the same-frequency neighbor small cell base station minus the power difference. The power difference is equal to the maximum signal reception of the same-frequency neighbor small cell base station that the small cell base station can accept. The difference between the power and the received power of the signal.

8. The method according to claim 1, characterized in that,

Measuring the characteristic measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station includes: measuring the signal arrival angle of the downlink reference signal of the same-frequency neighbor small cell base station;

The small cell base station determines the scheduling information for scheduling the terminal according to the characteristic measurement quantity, including: the small cell base station determines the beamforming direction angle of the scheduled terminal according to the signal arrival angle, and the beamforming The direction angle and the signal arrival angle meet the distance threshold value;

Scheduling the scheduling terminal according to the scheduling information includes: the small cell base station scheduling the scheduling terminal corresponding to the beamforming direction angle.

9. The method according to claim 8, characterized in that, after measuring the signal arrival angle of the downlink reference signal of the same-frequency neighbor small cell base station, it further includes:

The small cell base station notifies the same-frequency neighbor small cell base station of the arrival angle indication information used to indicate the signal arrival angle, so that the same-frequency neighbor small cell base station selects a target neighbor terminal according to the arrival angle indication information. Scheduling is performed, the target neighbor terminal is a terminal served by the same-frequency neighbor small cell base station, and the beamforming direction angle of the target neighbor terminal and the signal arrival angle satisfy the distance threshold.

10. The method according to claim 9, characterized in that the angle of arrival indication information includes: the signal angle of arrival or a precoding matrix indication.

11. The method according to claim 1, wherein before measuring the characteristic measurement amount of the downlink reference signal of the co-frequency neighbor small cell base station, it further includes:

The small cell base station determines the same-frequency neighbor small cell base station and the uplink interference subframe.

12. The method according to claim 11, wherein the small cell base station determines the same-frequency neighbor small cell base station and the uplink interference subframe, including:

If the small cell base station parses the broadcast message of another base station and obtains the cell identity and uplink and downlink configuration included in the broadcast message, it determines that the other base station is an intra-frequency neighbor small cell base station;

The small cell base station determines the uplink interference subframe according to the uplink and downlink configuration.

13. The method according to claim 11, wherein the small cell base station determines the same-frequency neighbor small cell base station and the uplink interference subframe, including:

The small cell base station detects the signal received power of the downlink reference signal of another base station in its own uplink subframe. If the signal received power is greater than or equal to the preset threshold, it is determined that the other base station is the The same frequency neighbor small cell base station, and the uplink subframe is the uplink interference subframe.

14. A base station, characterized by including:

An information acquisition unit, configured to measure the characteristic measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station in the uplink interference subframe with the same-frequency neighbor small cell base station;

a scheduling processing unit, configured to determine scheduling information for scheduling the terminal according to the characteristic measurement quantity measured by the information acquisition unit;

A scheduling execution unit, configured to schedule the scheduling terminal according to the scheduling information determined by the scheduling processing unit.

15. The base station according to claim 14, characterized in that,

The information acquisition unit is specifically configured to measure the signal received power of the downlink reference signal of the same-frequency neighbor small cell base station in the uplink interference subframe with the same-frequency neighbor small cell base station; the scheduling processing unit is specifically For calculating the expected transmission power of the scheduling terminal according to the signal reception power measured by the information acquisition unit; and determining the uplink transmission power of the scheduling terminal according to the expected transmission power; The scheduling execution unit is specifically configured to notify the scheduling terminal of the uplink transmission power determined by the scheduling processing unit, so that the scheduling terminal uses the uplink transmission power to send uplink data.

16. The base station according to claim 15, characterized in that,

The scheduling processing unit, when determining the uplink transmit power of the scheduled terminal according to the expected transmit power, is specifically configured to determine if the expected transmit power is less than the maximum uplink transmit power of the scheduled terminal. The transmit power is used as the uplink transmit power of the scheduled terminal.

17. The base station according to claim 16, characterized in that,

The scheduling processing unit is further configured to: when the scheduled terminal is determined by the small cell base station from at least two terminals to be selected, if the expected transmission power is less than the maximum uplink transmission power of the terminal to be selected At least two terminals to be selected, the terminal to be selected with the smallest expected transmission power among the at least two terminals to be selected is selected as the scheduled terminal.

18. The base station according to claim 15, characterized in that,

The scheduling processing unit, when determining the uplink transmit power of the scheduled terminal according to the expected transmit power, is specifically configured to determine if the expected transmit power is greater than or equal to the maximum uplink transmit power of the scheduled terminal. The maximum uplink transmit power is used as the uplink transmit power of the scheduled terminal;

The scheduling execution unit is also configured to notify the scheduling terminal not to send uplink data on the resource unit where the downlink reference signal of the same-frequency neighbor small cell base station is located.

19. The base station according to claim 18, characterized in that,

The scheduling execution unit is further configured to notify the same-frequency neighbor of the uplink reference signal pattern of the scheduling terminal after the scheduling processing unit determines the maximum uplink transmission power as the uplink transmission power of the scheduling terminal. The small cell base station is so that the co-frequency neighbor small cell base station selects and schedules neighbor terminals that receive the signal power of the uplink reference signal less than a threshold value according to the uplink reference signal pattern, and the neighbor terminal is the same frequency. Terminals served by neighboring small cell base stations.

20. The base station according to claim 15, characterized in that,

The scheduling execution unit is also configured to notify the same-frequency neighbor small cell base station to request the same-frequency neighbor small cell base station when the scheduling processing unit determines that the expected transmission power is greater than or equal to the maximum uplink transmission power of the scheduling terminal. The power of neighbor small cell base stations sending downlink data is less than or equal to to the critical power; the critical power is equal to the transmission power of the downlink reference signal of the same-frequency neighbor small cell base station minus the power difference, and the power difference is equal to the same-frequency neighbor small cell base station that the small cell base station can accept The difference between the maximum signal received power and the signal received power.

21. The base station according to claim 14, characterized in that,

The information acquisition unit is specifically used to measure the signal arrival angle of the downlink reference signal of the same-frequency neighbor small cell base station;

The scheduling processing unit is specifically configured to determine the beamforming direction angle of the scheduling terminal according to the signal arrival angle measured by the information acquisition unit, and the beamforming direction angle and the signal arrival angle satisfy the requirement of being far away from the door. limit;

The scheduling execution unit is specifically used to schedule the scheduling terminal corresponding to the beamforming direction angle.

22. The base station according to claim 21, characterized in that,

The scheduling execution unit is further configured to, after the information acquisition unit measures the signal arrival angle of the downlink reference signal, notify the same-frequency neighbor small cell of the arrival angle indication information used to indicate the signal arrival angle. The base station, so that the same-frequency neighbor small cell base station selects a target neighbor terminal for scheduling according to the angle of arrival indication information, the target neighbor terminal is a terminal served by the same-frequency neighbor small cell base station, and the target neighbor terminal The beamforming direction angle and the signal arrival angle satisfy the distance threshold.

23. The base station according to claim 22, wherein the angle of arrival indication information includes: the signal angle of arrival or a precoding matrix indication.

24. The base station according to claim 14, characterized in that,

The information acquisition unit is further configured to determine the same-frequency neighbor small cell base station and the uplink interference subframe before measuring the characteristic measurement quantity of the downlink reference signal of the same-frequency neighbor small cell base station.

25. The base station according to claim 24, characterized in that,

The information acquisition unit, when determining the same-frequency neighbor small cell base station and the uplink interference subframe, is specifically used to obtain the information included in the broadcast message if the small cell base station parses the broadcast message of another base station. If the cell identifier and the uplink and downlink configuration are determined, it is determined that the other base station is the same-frequency neighbor small cell base station; and the uplink interference subframe is determined according to the uplink and downlink configuration.

26. The base station according to claim 24, characterized in that,

The information acquisition unit determines the co-frequency neighbor small cell base station and the uplink interferer. frame, specifically, it is used to detect the signal received power of the downlink reference signal of another base station in its own uplink subframe. If the signal received power is greater than or equal to the preset threshold value, it is determined that the other base station is The same-frequency neighbor small cell base station, and the uplink subframe is the uplink interference subframe.