CN105792277A - Interference control method and device - Google Patents

Abstract

The invention relates to an interference control method and device. The interference control method includes: performing neighboring cell measurement, selecting at least one neighboring cell whose signal transmission strength is greater than that of the serving cell in the measured neighboring cell as an interfering cell; analyzing the physical broadcast channel PBCH of the interfering cell, and obtaining the interfering cell The number of antenna ports of the cell; according to the physical cell identity PCI of the interfering cell and the number of antenna ports, obtain the cell reference signaling CRS position of the interfering cell; perform interference control according to the CRS position information. According to the embodiment of the present invention, the interference of adjacent cell signals to the user equipment in the serving cell is weakened, the communication quality of the user equipment in the serving cell is improved, and some hotspot cells can better share the business load for the macro cell.

Description

Interference control method and apparatus

technical field

Embodiments of the present invention relate to the field of wireless communication, and more specifically, to an interference control method and device in a wireless communication system.

Background technique

The wireless communication system can provide wireless services such as voice and data. A general wireless communication system is a multiple access wireless system. In a wireless communication system, a base station transmits data and/or control information to a user equipment on a downlink, and receives data and/or control information from a user equipment on an uplink. Similarly, user equipment (User Equipment, UE for short) transmits data and/or control information for the base station on the uplink, and receives data and/or control information transmitted by the base station on the downlink. The technical background of the present invention will be described below by taking a Long Term Evolution (LTE for short) and/or Long Term Evolution Advanced (LTE-A for short) wireless communication system as an example.

In order to meet or improve the performance requirements of LTE-A, base stations of different types or standards (such as base stations with low transmit power or transmit/receive nodes) are deployed in a homogeneous network to enhance network coverage and performance. The network structure is called heterogeneous network (Heterogeneous network). In the following, a base station with high transmission power such as a macro base station and a base station with the same standard as the macro base station (MeNB) but with a different type of low transmission power (referred to as A low power base station (lowerpowernode, LPN) is taken as an example to further illustrate the technical background of the present invention.

In order to improve the spectrum utilization efficiency of the system, the uplink and/or downlink spectrum resources configurable by the LPN and the uplink and/or downlink spectrum resources configurable by the MeNB can be completely or partially spectrum-multiplexed. At this time, since the LPN configures the same or part of the same spectrum resources as the MeNB, there will be co-channel (or uplink) channel transmission between the LPN (or the UE served by the LPN) and the MeNB (or the UE served by the MeNB). same frequency) interference. Interference will affect the reliability of LPN and MeNB downlink channel transmission and uplink channel (channels include control channel and data channel) detection.

Currently, the LTE-A standard adopts a Time Division Multiplexing (TDM for short) inter-cell interference coordination (InterCell Interference Coordination, ICIC for short) method to deal with inter-cell interference in a heterogeneous network scenario. The interfering base station sets some subframes to low transmission power or does not perform service transmission (that is, the service transmission power is zero), and the above subframes may be called almost blank subframes (Almost Blank Subframe, ABS for short). The interfered base station schedules the UE strongly interfered by the interfered base station to perform service transmission on the subframe corresponding to the ABS subframe configured by the interfered base station, so as to ensure the transmission performance of the victim UE of the interfered base station. However, for backward compatibility, the ABS subframe still sends Cell Reference Signaling (Cell Reference Signaling, CRS for short) and other necessary control information, such as synchronization signaling and system messages. In the case of strong interference at the edge of the cell, the CRS signaling of the ABS subframe of the adjacent cell will still have a downlink Physical Downlink Control Channel (PDCCH for short) and Physical Downlink Shared Channel (PhysicalDownlinkShareChannel, Decoding of signaling/data on PDSCH for short) poses a great threat. Therefore, there is a need for a technical solution to this interference problem.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a method and equipment capable of reducing interference from neighboring cells.

According to an embodiment of the present invention, an interference control method is proposed, the method includes:

Perform neighbor cell measurement, and select at least one neighbor cell whose signal transmission strength is greater than the signal transmission strength of the serving cell in the measured neighbor cell as an interfering cell;

Analyzing the physical broadcast channel PBCH of the interfering cell to obtain the number of antenna ports of the interfering cell;

Acquiring the cell reference signaling CRS position of the interfering cell according to the physical cell identity PCI of the interfering cell and the number of antenna ports;

Interference control is performed according to the CRS location information.

According to an embodiment of the present invention, an interference control method is proposed, the method includes:

Determine the interfering cell, and obtain the PCI of the interfering cell and the number of antenna ports;

sending an interference control message to the UE, where the interference control message includes the PCI of the interfering cell and the number of antenna ports,

so that the UE acquires the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports;

Interference control is performed according to the CRS location information.

According to an embodiment of the present invention, an interference control method is proposed, the method includes:

sending a measurement report to the base station, wherein the measurement report includes the RSRP value of the serving cell and the RSRP value of the neighboring cell, so that the base station determines that at least one neighboring cell whose RSRP value is greater than the RSRP value of the serving cell is an interfering cell, and making the base station obtain the PCI and the number of antenna ports of the interfering cell;

receiving an interference control message sent by the base station, where the interference control message includes the PCI of the interfering cell and the number of antenna ports;

Acquiring the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports;

Subtracting the signal received from the interfering cell from the signal obtained at the CRS position, or discarding the signal obtained at the CRS position.

According to an embodiment of the present invention, an interference control method is proposed, the method includes:

Perform neighbor cell measurement, and select at least one neighbor cell whose signal transmission strength is greater than the signal transmission strength of the serving cell in the measured neighbor cell as an interfering cell;

Sending a request message to the base station for acquiring the number of antenna ports of the interfering cell, where the request message carries the PCI of the interfering cell;

receiving a response message sent by the base station to the request message, where the response message carries the PCI of the interfering cell and the number of antenna ports of the interfering cell;

Acquiring the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports of the interfering cell;

Subtracting the signal received from the interfering cell from the signal obtained at the CRS position, or discarding the signal obtained at the CRS position.

According to an embodiment of the present invention, an interference control method is proposed, the method includes:

The first base station sends an X2 establishment request message to the second base station, where the X2 establishment request message carries the PCI and the number of antenna ports of the serving cell of the first base station, and/or, carries the CSI-RS information of the first base station ,

so that the second base station obtains the CRS position of the first base station according to the PCI of the serving cell of the first base station and the number of antenna ports, and judges whether there is a CRS position and the location of the serving cell under the second base station. The CRS position of the first base station conflicts, and/or judges whether the CSI-RS of the second base station collides with the CSI-RS of the first base station according to the CSI-RS of the first base station;

When the judgment result is that there is a CRS position conflict and/or the CSI-RS conflict, the first base station changes the PCI of its serving cell and/or changes the CSI-RS of the first base station.

According to an embodiment of the present invention, an interference control method is proposed, the method includes:

The second base station receives the X2 establishment request message sent by the first base station, wherein the X2 establishment request message carries the PCI and the number of antenna ports of the serving cell of the first base station, and/or carries the CSI-RS information of the first base station ;

The second base station obtains the CRS position of the first base station according to the PCI of the serving cell of the first base station and the number of antenna ports, and judges whether there is a CRS position of the serving cell under the second base station that matches the The CRS position of the first base station conflicts, and/or judging whether the CSI-RS of the second base station collides with the CSI-RS of the first base station according to the CSI-RS of the first base station;

When the judgment result is that there is a CRS position conflict and/or the CSI-RS conflict, the second base station changes the PCI of its serving cell and/or changes the CSI-RS of the second base station.

According to an embodiment of the present invention, a user equipment is proposed, and the user equipment includes:

The measurement unit is used to perform neighboring cell measurement, and select at least one neighboring cell whose signal transmission strength is greater than that of the serving cell in the measured neighboring cell as an interfering cell;

An analysis unit, configured to analyze the physical broadcast channel PBCH of the interfering cell, and obtain the number of antenna ports of the interfering cell;

A CRS position acquiring unit, configured to acquire the cell reference signaling CRS position of the interfering cell according to the physical cell identifier PCI of the interfering cell and the number of antenna ports;

An interference control unit, configured to subtract the signal received from the interfering cell from the signal obtained at the CRS position, or discard the signal obtained at the CRS position.

According to an embodiment of the present invention, a base station is proposed, and the base station includes:

A determining unit, configured to determine an interfering cell, and obtain the PCI of the interfering cell and the number of antenna ports;

a sending unit, configured to send an interference control message to the UE, where the interference control message includes the PCI of the interfering cell and the number of antenna ports,

so that the UE acquires the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports,

Subtracting the signal received from the interfering cell from the signal obtained at the CRS position, or discarding the signal obtained at the CRS position.

According to an embodiment of the present invention, a user equipment is proposed, and the user equipment includes:

A sending unit, configured to send a measurement report to the base station, wherein the measurement report includes the RSRP value of the serving cell and the RSRP value of the neighboring cell, so that the base station determines at least one neighboring cell whose RSRP value is greater than the RSRP value of the serving cell being an interfering cell, and causing the base station to obtain the PCI and the number of antenna ports of the interfering cell;

a receiving unit, configured to receive an interference control message sent by the base station, where the interference control message includes the PCI of the interfering cell and the number of antenna ports;

A CRS position acquiring unit, configured to acquire the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports;

An interference control unit, configured to subtract the signal received from the interfering cell from the signal obtained at the CRS position, or discard the signal obtained at the CRS position.

According to an embodiment of the present invention, a user equipment is proposed, and the user equipment includes:

The measurement unit is used to perform neighboring cell measurement, and select at least one neighboring cell whose signal transmission strength is greater than that of the serving cell in the measured neighboring cell as an interfering cell;

a sending unit, configured to send a request message to the base station to obtain the number of antenna ports of the interfering cell, where the request message carries the PCI of the interfering cell;

a receiving unit, configured to receive a response message sent by the base station to the request message, where the response message carries the PCI of the interfering cell and the number of antenna ports of the interfering cell;

A CRS position acquiring unit, configured to acquire the cell reference signaling CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports of the interfering cell;

An interference control unit, configured to subtract the signal received from the interfering cell from the signal obtained at the CRS position, or discard the signal obtained at the CRS position.

According to an embodiment of the present invention, a base station is proposed, and the base station includes:

The X2 request unit is configured to send an X2 establishment request message to the second base station, where the X2 establishment request message carries the PCI and the number of antenna ports of the serving cell of the base station, and/or carries the CSI-RS of the base station information,

so that the second base station obtains the CRS position of the base station according to the PCI of the serving cell of the base station and the number of antenna ports, and judges whether there is a CRS position of the serving cell and the CRS position of the base station under the second base station. CRS positions conflict, and/or judge whether the CSI-RS of the second base station collides with the CSI-RS of the base station according to the CSI-RS of the base station;

A control unit configured to change the PCI of the serving cell of the base station and/or change the CSI-RS of the base station when the judgment result is that there is a CRS position conflict and/or the CSI-RS conflict.

According to an embodiment of the present invention, a base station is proposed, and the base station includes:

The receiving unit is configured to receive an X2 establishment request message sent by the first base station, wherein the X2 establishment request message carries the PCI and the number of antenna ports of the serving cell of the first base station, and/or carries the CSI- RS information;

A conflict determining unit, configured to obtain the CRS position of the first base station according to the PCI of the serving cell of the first base station and the number of antenna ports, and determine whether there is a CRS position of the serving cell under the base station that is consistent with the second The CRS position of a base station conflicts, and/or judging whether the CSI-RS of the base station collides with the CSI-RS of the first base station according to the CSI-RS of the first base station;

A control unit configured to change the PCI of the serving cell of the base station and/or change the CSI-RS of the base station when the judgment result is that there is a CRS position conflict and/or the CSI-RS conflict.

According to the embodiment of the present invention, the interference of adjacent cell signals to the user equipment in the serving cell is weakened, the communication quality of the user equipment in the serving cell is improved, and some hotspot cells can better share the business load for the macro cell.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a flowchart of an interference control method according to an embodiment of the present invention;

FIG. 2 is a flowchart of an interference control method according to another embodiment of the present invention;

FIG. 3 is a flowchart of an interference control method according to another embodiment of the present invention;

FIG. 4 is a flowchart of an interference control method according to another embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of a user equipment according to a further embodiment of the present invention;

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

Fig. 8 is a schematic structural diagram of a user equipment according to another embodiment of the present invention;

Fig. 9 is a schematic structural diagram of a user equipment according to another embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a base station according to another embodiment of the present invention;

Fig. 11 is a schematic structural diagram of a base station according to a further embodiment of the present invention;

Figure 12 is a schematic structural diagram of a base station according to a further embodiment of the present invention; and

Fig. 13 is a schematic structural diagram of a base station according to another embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The technical scheme of the present invention can be applied to various communication systems, such as: GSM, Code Division Multiple Access (CDMA, CodeDivisionMultipleAccess) system, Wideband Code Division Multiple Access (WCDMA, WidebandCodeDivisionMultipleAccessWireless), General Packet Radio Service (GPRS, GeneralPacketRadioService), Long Term Evolution (LTE, Long Term Evolution), etc.

A user equipment (UE, UserEquipment), also called a mobile terminal (MobileTerminal), mobile user equipment, etc., can communicate with one or more core networks via a radio access network (for example, RAN, RadioAccessNetwork), and the user equipment can are mobile terminals, such as mobile telephones (or "cellular" telephones) and computers with mobile terminals, such as portable, pocket, hand-held, built-in computers, or vehicle-mounted mobile devices, which are connected to the wireless access network Exchange language and/or data.

The base station can be a base station (BTS, BaseTransceiverStation) in GSM or CDMA, or a base station (NodeB) in WCDMA, or an evolved base station (eNB or e-NodeB, evolutionNodeB) in LTE. The present invention does not However, for the convenience of description, the following embodiments take eNB as an example for illustration.

Fig. 1 is a flowchart of an interference control method 100 according to an embodiment of the present invention. As shown in FIG. 1, the interference control method 100 includes:

110: Perform neighbor cell measurement, and select at least one neighbor cell whose signal transmission strength is greater than the signal transmission strength of the serving cell among the measured neighbor cells as an interfering cell. According to the embodiment of the present invention, the signal transmission strength is, for example, Reference Signal Received Power (Reference Signal Received Power, RSRP for short) and/or Reference Signal Received Quality (Reference Signal Received Quality, referred to as RSRQ).

120: Analyze the physical broadcast channel (Physical Broadcasting Channel, PBCH for short) of the interfering cell, and acquire the number of antenna ports of the interfering cell;

130: Acquire a Cell Reference Signaling (Cell Reference Signaling, CRS for short) location of the interfering cell according to the Physical Cell Indicator (PCI for short) of the interfering cell and the number of antenna ports;

140: Perform interference control according to the CRS location information, such as subtracting the signal received from the interfering cell from the signal obtained at the CRS location, or discarding the signal obtained at the CRS location.

According to the embodiment of the present invention, the UE can measure the radio signal of the serving cell, and thereby monitor the quality of the radio resource signal of the serving cell. For example, the UE may obtain a Signal to Interference plus Noise Ratio (SINR) value through Channel Quality Indicator (CQI) measurement, or the UE may obtain an RSRQ value through Radio Resource Management (RRM) measurement. The UE may compare the SINR value or the RSRQ value with the threshold Thic sent to the UE by the serving base station. If the SINR or RSRQ is lower than the threshold Thic, it means that the UE is interfered by neighboring cells and the signal quality is deteriorated, and interference control needs to be implemented. If the SINR or RSRQ is higher than the threshold Thic, it means that the UE is not seriously interfered by adjacent cells, and interference control may not be performed.

According to the embodiment of the present invention, when performing neighbor cell measurement in step 110, the neighbor cell whose RSRP/RSRQ in the measured neighbor cell is larger than the RSRP/RSRQ of the serving cell is equal to or exceeds the threshold Thag (for example, 6dB) can be selected as an interfering cell. The interfering cell here refers to a neighboring cell that interferes strongly with the UE signal in the serving cell. The number of interfering cells can be selected as one or more. For example, according to the ranking of the RSRP/RSRQ of the neighboring cells, several neighboring cells whose RSRP/RSRQ is greater than the RSRP/RSRQ of the serving cell by more than Thag are selected as interfering cells.

According to the embodiment of the present invention, in step 130, according to the physical cell identity PCI of the interfering cell and the number of antenna ports, the cell reference signaling CRS position of the interfering cell is obtained, and the neighbor cell needs to be synchronized, so as to obtain the The PCI of the area is obtained, and the PCI of the interfering cell is also obtained at the same time. After the CRS position of the interfering cell is obtained, in step 140, interference elimination processing may be performed on the signal received from the interfering cell.

According to the embodiment of the present invention, in step 140, when the UE receives data or signaling on the radio resource of the CRS position of the interfering cell, the UE will implement interference coordination. For example, the UE parses out the signal received from the interfering cell received at the CRS position, and analyzes all the signals received from the CRS position (including the signal sent from the serving cell and signals from all neighboring cells) or when the interference of the interfering cell is very strong, the UE may discard all the signals received at the CRS position.

In the above-mentioned embodiments of the present invention, the work of identifying interfering cells in interference coordination, that is, neighboring cells with strong interference, is mainly completed by the UE side. The above thresholds Thag and Thic are sent to the UE for the UE to perform interference coordination. A specific manner is through system broadcast messages, and/or RRC dedicated signaling, or MAC (Medium Access Control Medium Access Control) control signaling, or PDCCH (PhysicalDownlinkControlChannel control signaling).

According to other embodiments of the present invention, the work of identifying interfering cells in interference coordination may also be mainly completed by the base station side.

Fig. 2 is a flow chart of an interference control method 200 according to another embodiment of the present invention. In this embodiment, the base station first identifies the interfering cell, and then notifies the UE to perform interference coordination. As shown in FIG. 2, the interference control method 200 includes:

210: The base station determines the interfering cell, and acquires the PCI and the number of antenna ports of the interfering cell.

According to the embodiment of the present invention, the base station may determine the interfering cell in multiple ways. One way of determining the interfering cell is: the base station receives a measurement report sent by the UE, wherein the measurement report includes the RSRP value of the serving cell and the RSRP value of the neighboring cell; the base station determines that the RSRP value is greater than at least one of the RSRP values of the serving cell Neighboring cells are interfering cells. As mentioned above, the base station can also determine the interfering cell through the RSRQ value. Similar to the above embodiment, the interfering cell may also be determined by the serving cell and the RSRQ value of the neighboring cell in the measurement report sent by the UE.

Another way to determine the interfering cell is: the base station configures the relationship between the serving cell and other adjacent cells through the operation, administration and maintenance entity (OAM) for infringement and victimization (the cell with strong downlink interference is the victim cell, the interference other cells are offending cells) determine at least one offending neighboring cell as an interfering cell.

Another way to determine the interfering cell is: the base station learns that the neighbor cell has downlink interference to the UE in the serving cell when the relative narrowband transmit power (RelativeNarrowbandTXPower, RNTP) obtained by the received load indication (LoadIndication) exceeds the threshold, and thus determines the interfering cell .

220: Send an interference control message to the UE, where the interference control message includes the PCI of the interfering cell and the number of antenna ports, so that the UE acquires the interfering cell according to the PCI of the interfering cell and the number of antenna ports According to the CRS position information, interference control is performed, such as subtracting the signal received from the interfering cell from the signal obtained at the CRS position, or discarding the signal obtained at the CRS position.

According to this embodiment of the present invention, when determining interfering cells by RSRP/RSRQ values or RNTP values in step 210, the base station can sort the RSRP/RSRQ or RNTP values of neighboring cells according to high and low, thereby determining one or more interfering cells . The same as in the interference control method 100 of the above-mentioned embodiment, the base station can select the value of RSRP/RSRQ or RNTP in the neighboring cell to be measured to be equal to or exceed the threshold Thag (for example, 6dB) greater than the RSRP/RSRQ or RNTP value of the serving cell Neighboring cells are used as interfering cells.

After identifying the interfering cell, the base station may notify the UE of the interfering cell in step 220, so that the UE can perform interference coordination. The specific interference coordination mechanism is similar to step 140 in the interference control method 100 above, that is, when the UE receives data or signaling on the radio resource of the CRS position of the interfering cell, the UE will implement interference coordination. For example, the UE parses out the signal received from the interfering cell received at the CRS position, and analyzes all the signals received from the CRS position (including the signal sent from the serving cell and signals from all neighboring cells) or when the interference of the interfering cell is very strong, the UE may discard all the signals received at the CRS position.

In this embodiment, if the interfering cell is determined by the RSRP/RSRQ value, from the perspective of the UE side, the main work done by the UE is:

The UE sends a measurement report to the base station, wherein the measurement report includes the RSRP/RSRQ value of the serving cell and the RSRP/RSRQ value of the neighboring cell, so that the base station determines that the RSRP/RSRQ value is greater than the RSRP/RSRQ value of the serving cell At least one neighboring cell is an interfering cell, and enabling the base station to obtain the PCI and the number of antenna ports of the interfering cell;

The UE receives the interference control message sent by the base station, where the interference control message includes the PCI of the interfering cell and the number of antenna ports;

The UE acquires the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports;

The UE performs interference control according to the CRS location information, such as subtracting the signal received from the interfering cell from the signal obtained at the CRS location, or discarding the signal obtained at the CRS location.

According to other embodiments of the present invention, interference coordination may be implemented by the base station and the UE in cooperation.

Fig. 3 is a flowchart of an interference control method 300 according to another example of the present invention. In this embodiment, first, the UE side determines the interfering cell, and then the base station side obtains the PCI and the number of antenna ports of the interfering cell, and then the UE side side for interference coordination. As shown in Figure 3, the interference control method 300 includes:

310: Perform neighbor cell measurement, and select at least one neighbor cell whose signal transmission strength is greater than the signal transmission strength of the serving cell in the measured neighbor cell as an interfering cell;

320: Send a request message to the base station, for obtaining the number of antenna ports of the interfering cell, where the request message carries the PCI of the interfering cell;

330: Receive a response message sent by the base station from the interfering cell to the request message, where the response message carries the PCI of the interfering cell and the number of antenna ports of the interfering cell;

340: Acquire the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports of the interfering cell;

350: Perform interference control according to the CRS location information, such as subtracting the signal received from the interfering cell from the signal obtained at the CRS location, or discarding the signal obtained at the CRS location.

Same as the embodiment shown in FIG. 1 , the signal transmission strength can be represented by RSRP or RSRQ value.

Same as the embodiment described in FIG. 1 , according to the embodiment of the present invention shown in FIG. 3 , the UE can measure the radio signal of the serving cell, and thereby monitor the quality of the radio resource signal of the serving cell. For example, the UE can obtain the SINR value through CQI measurement, or the UE can obtain the RSRQ value through RRM measurement. The UE may compare the SINR value or the RSRQ value with the threshold Thic sent to the UE by the serving base station. If the SINR or RSRQ is lower than the threshold Thic, it means that the UE is interfered by neighboring cells and the signal quality is deteriorated, and interference control needs to be implemented. If the SINR or RSRQ is higher than the threshold Thic, it means that the UE is not seriously interfered by adjacent cells, and interference control may not be performed.

According to the embodiment of the present invention, when performing the neighbor cell measurement in step 310, the neighbor cell whose RSRP/RSRQ in the measured neighbor cell is greater than the RSRP/RSRQ of the serving cell is equal to or exceeds the threshold Thag (for example, 6dB) can be selected as an interfering cell. The interfering cell here refers to a neighboring cell that interferes strongly with the UE signal in the serving cell. The number of interfering cells can be selected as one or more. For example, according to the ranking of the RSRP/RSRQ of the neighboring cells, several neighboring cells whose RSRP/RSRQ is greater than the RSRP/RSRQ of the serving cell by more than Thag are selected as interfering cells.

Different from the embodiment shown in FIG. 1, according to the embodiment shown in FIG. 3, in step 320, the UE sends a request message to the base station according to the PCI of the interfering cell, so as to obtain the number of antenna ports of the interfering cell. Then in step 330, the UE receives the response message sent by the base station to the request message, and sends the number of antenna ports of the interfering cell to the UE. After acquiring the CRS position of the interfering cell, the UE may acquire the CRS position of the interfering cell in step 340 according to the PCI and the number of antenna ports of the interfering cell. Then in step 350, interference elimination processing is performed on the signal received from the interfering cell.

According to the embodiment of the present invention, in step 350, when the UE receives data or signaling on the radio resource of the CRS position of the interfering cell, the UE will implement interference coordination. For example, the UE parses out the signal received from the interfering cell received at the CRS position, and analyzes all the signals received from the CRS position (including the signal sent from the serving cell and signals from all neighboring cells) or when the interference of the interfering cell is very strong, the UE may discard all the signals received at the CRS position.

In the embodiment of the present invention shown in Fig. 3, the identification of interfering cells in interference coordination, that is, the work of neighboring cells with strong interference is completed by UE side and base station side in cooperation. Other notification signaling sends the aforementioned thresholds Thag and Thic to the UE for the UE to perform interference coordination. A specific manner is through system broadcast messages, and/or RRC dedicated signaling, or MAC (Medium Access Control Media Access Control) control signaling, or PDCCH (PhysicalDownlinkControlChannel control signaling).

The UE is interfered by signals from neighboring cells, mainly due to the conflict between the CRS positions of the serving cell and the CRS positions of the neighboring cells. In the case of channel state information reference signaling (ChannelStatusInformationReferenceSignaling, referred to as CSI-RS), the conflict between the CSI-RS configuration information of the serving cell and the CSI-RS configuration information of the neighboring cell will also cause interference to the UE in the serving cell. Therefore, according to another embodiment of the present invention, it may be considered to coordinate between the base station eNB1 in the serving cell and the base station eNB2 in the neighboring cell to avoid the collision of CRS/CSI-RS of eNB1 and eNB2, and thereby weaken or even eliminate Interference to UEs within the serving cell.

Fig. 4 is a flowchart of an interference control method 400 according to another embodiment of the present invention. As shown in FIG. 4, the interference control method 400 includes:

410: The first base station eNB1 sends an X2 establishment request message to the second base station eNB2, where the X2 establishment request message carries the PCI and the number of antenna ports of the serving cell of the first base station eNB1, and/or carries the first base station CSI-RS information,

so that the second base station eNB2 obtains the CRS position of the first base station according to the PCI and the number of antenna ports of the serving cell of the first base station eNB1, and determines whether there is a serving cell under the second base station eNB2 The CRS position conflicts with the CRS position of the first base station eNB1, and/or judges whether the CSI-RS of the second base station eNB2 is consistent with the CSI-RS of the first base station eNB1 according to the CSI-RS of the first base station eNB1 RS conflict;

420: When the judgment result is that there is a CRS position conflict and/or the CSI-RS conflict, the first base station eNB1 changes the PCI of its serving cell and/or changes the CSI-RS of the first base station eNB1.

Changing the PCI of its serving cell by eNB1 can cause its CRS position to change, so it no longer conflicts with the CRS position of eNB2.

According to the embodiment of the present invention, eNB1 can change its PCI and/or change its CSI-RS configuration information through negotiation between eNB1 and eNB2. The specific implementation process is:

The first base station eNB1 receives the X2 setup response message sent by the second base station eNB2, where the X2 setup response message carries a request to the first base station eNB1 to change the PCI of its serving cell and/or change the PCI of the first base station Request information from CSI-RS;

According to the request information for changing the PCI of the serving cell and/or changing the CSI-RS of the first base station eNB1, the first base station eNB1 changes the PCI of the serving cell of the first base station eNB1 and/or changes the CSI-RS;

The first base station eNB1 sends a configuration update message to the second base station eNB2, where the configuration update message carries the changed PCI of the serving cell of the first base station eNB1 and/or the changed CSI- RS.

According to another embodiment of the present invention, eNB1 may also shift the position of the CRS and/or CSI-RS of eNB1 according to the request of eNB2. The specific implementation process is:

The first base station eNB1 receives a time offset message sent by the second base station eNB2, where the time offset message carries a time symbol offset value or a subframe offset value;

The first base station eNB1 offsets the CRS of the first base station and/or offsets the CSI-RS of the first base station eNB1 according to the time symbol offset value in the time symbol offset message.

According to another embodiment of the present invention, eNB2 may also change the PCI and/or CSI-RS configuration of its own serving cell to avoid collision with the CRS and/or CSI-RS of eNB1. From the side of eNB2, the main work done by eNB2 is:

The second base station eNB2 receives the X2 establishment request message sent by the first base station eNB1, wherein the X2 establishment request message carries the PCI and the number of antenna ports of the serving cell of the first base station eNB1, and/or carries the number of antenna ports of the first base station eNB1 CSI-RS information;

The second base station eNB2 obtains the CRS position of the first base station eNB1 according to the PCI of the serving cell of the first base station eNB1 and the number of antenna ports, and judges whether the CRS position of the serving cell and the CRS of the first base station eNB1 exist under the second base station eNB2 location conflict, and/or judging whether the CSI-RS of the second base station eNB2 collides with the CSI-RS of the first base station eNB1 according to the CSI-RS of the first base station eNB1;

When the judgment result is that there is a CRS position conflict and/or the CSI-RS conflict, the second base station eNB2 changes the PCI of its serving cell and/or changes the CSI-RS of the second base station.

According to another embodiment of the present invention, when there is a CRS position conflict and/or the CSI-RS position conflict, the second base station eNB2 may also shift the CRS and/or CSI-RS configuration of its serving cell by itself, the The offset is a time symbol offset or a subframe offset, and is notified to the first base station eNB1 to avoid CRS/CSI-RS collision.

According to the embodiment of the present invention, the interference of adjacent cell signals to the user equipment in the serving cell is weakened, the communication quality of the user equipment in the serving cell is improved, and some hotspot cells can better share the business load for the macro cell.

According to the embodiments of the present invention, a user equipment and a base station for implementing the interference control method of the embodiments of the present invention are also proposed. It should be noted that the features of the method in the embodiment of the present invention are also applicable to the user equipment and the base station in the embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a user equipment 500 according to an embodiment of the present invention. As shown in FIG. 5, user equipment 500 includes:

The measuring unit 510 is configured to perform neighboring cell measurement, and select at least one neighboring cell whose signal transmission strength is greater than the signal transmission strength of the serving cell in the measured neighboring cell as an interfering cell;

An analysis unit 520, configured to analyze the physical broadcast channel PBCH of the interfering cell, and obtain the number of antenna ports of the interfering cell;

The CRS position obtaining unit 530 is configured to obtain the cell reference signaling CRS position of the interfering cell according to the physical cell identity PCI of the interfering cell and the number of antenna ports;

The interference control unit 540 performs interference control according to the CRS position information, such as subtracting the signal received from the interfering cell from the signal obtained at the CRS position, or discarding the signal obtained at the CRS position .

According to an embodiment of the present invention, the signal transmission strength may be represented by an RSRP or RSRQ value.

According to the embodiment of the present invention, before performing the neighbor cell measurement, the measurement unit 510 is further configured to perform the signal quality measurement of the serving cell to obtain a measurement value representing the signal quality of the serving cell, and when the measurement value drops below the first threshold , perform the neighbor cell measurement.

According to the embodiment of the present invention, the signal quality measurement of the serving cell performed by the measurement unit 510 includes a channel quality index CQI measurement, and the measurement value is a signal-to-interference-noise ratio SINR value, or

The performing the signal quality measurement of the serving cell performed by the measurement unit 510 includes radio resource management RRM measurement, and the measurement value is a reference signal reception quality RSRQ value.

According to the embodiment of the present invention, in the performing neighbor cell measurement, the measurement unit 510 selects the amount of the RSRP in the measured neighbor cell that is larger than the RSRP of the serving cell as the second threshold, that is, at least one of Thag (for example, 6dB). Neighboring cells serve as the interfering cells.

According to the embodiment of the present invention, in the performing neighbor cell measurement, the measurement unit 510 selects the RSRQ of the measured neighbor cell greater than the RSRQ of the serving cell as the second threshold, that is, at least one of Thag (for example, 6dB). Neighboring cells serve as the interfering cells.

According to an embodiment of the present invention, as shown in FIG. 6 , the user equipment 500 further includes a receiving unit 550, configured to receive an interference control message sent by a base station, where the interference control message includes the first threshold and the second Two thresholds.

Fig. 7 is a schematic structural diagram of a base station 700 according to an embodiment of the present invention. As shown in FIG. 6, the base station 600 includes:

A determining unit 710, configured to determine an interfering cell, and obtain the PCI of the interfering cell and the number of antenna ports;

The sending unit 720 is configured to send an interference control message to the UE, where the interference control message includes the PCI of the interfering cell and the number of antenna ports, so that the UE obtains the The CRS position of the interfering cell, according to the CRS position information, performs interference control, such as subtracting the signal received from the interfering cell from the signal obtained at the CRS position, or discarding the signal obtained at the CRS position Signal.

According to an embodiment of the present invention, the determination unit 710 is configured to receive a measurement report sent by the user equipment UE, wherein the measurement report includes the RSRP value of the serving cell and the RSRP value of the neighboring cell, and is used to determine that the RSRP value is greater than the serving At least one neighboring cell of the RSRP value of the cell is an interfering cell, and the PCI and the number of antenna ports of the interfering cell are acquired.

According to an embodiment of the present invention, the determining unit 710 is configured to receive a measurement report sent by the user equipment UE, where the measurement report includes the RSRQ value of the serving cell and the RSRQ value of the neighboring cell, and is used to determine that the RSRQ value is greater than the serving At least one neighboring cell of the RSRQ value of the cell is an interfering cell, and the PCI and the number of antenna ports of the interfering cell are acquired.

According to the embodiment of the present invention, the determining unit 710 is configured to determine at least one offending neighboring cell as an interfering cell through OAM-configured violation and victim relations between the serving cell and other neighboring cells.

According to the embodiment of the present invention, the determining unit 710 is configured to know that the neighbor cell has downlink interference to the UE of the serving cell through the RNTP obtained from the received load indication exceeding a threshold, so as to determine the interfering cell.

According to the embodiment of the present invention, the determination unit 720 is configured to determine that the RSRP value greater than the RSRP value of the serving cell is the second threshold, that is, the adjacent cell of Thag (for example, 6dB) is the interfering cell.

According to the embodiment of the present invention, the determination unit 720 may also be configured to determine that the RSRQ value greater than the RSRQ value of the serving cell is the second threshold, that is, the adjacent cell of Thag (for example, 6dB) is the interfering cell.

Fig. 8 is a schematic structural diagram of another user equipment 800 according to an embodiment of the present invention. As shown in FIG. 8, user equipment 800 includes:

A sending unit 810, configured to send a measurement report to a base station, where the measurement report includes an RSRP value of a serving cell and an RSRP value of a neighboring cell, so that the base station determines at least one neighbor whose RSRP value is greater than the RSRP value of the serving cell The zone is an interfering cell, and the base station is made to obtain the PCI and the number of antenna ports of the interfering cell;

The receiving unit 820 is configured to receive an interference control message sent by the base station, where the interference control message includes the PCI of the interfering cell and the number of antenna ports;

A CRS position acquiring unit 830, configured to acquire the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports;

The interference control unit 840 performs interference control according to the CRS position information, such as subtracting the signal received from the interfering cell from the signal obtained at the CRS position, or discarding the signal obtained at the CRS position .

According to the embodiment of the present invention, the measurement report sent by the sending unit 810 to the base station may also include the RSRQ value of the serving cell and the RSRQ value of the neighboring cell, so that the base station determines that the RSRQ value is greater than at least one of the RSRQ values of the serving cell The neighboring cell is an interfering cell, and the base station is made to obtain the PCI and the number of antenna ports of the interfering cell.

According to the embodiment of the present invention, the sending unit 810 is configured to send a measurement report to the base station, so that the base station determines that the RSRP value is greater than the RSRP value of the serving cell as the second threshold, that is, Thag (for example, 6dB ) is the interfering cell.

According to the embodiment of the present invention, the sending unit 810 is configured to send a measurement report to the base station, so that the base station determines that the RSRQ value is greater than the RSRQ value of the serving cell as the second threshold, that is, Thag (for example, 6dB ) is the interfering cell.

Fig. 9 is a schematic structural diagram of another user equipment according to an embodiment of the present invention. As shown in FIG. 9, user equipment 900 includes:

The measuring unit 910 is configured to perform neighboring cell measurement, and select at least one neighboring cell whose signal transmission strength is greater than the signal transmission strength of the serving cell in the measured neighboring cell as an interfering cell;

The sending unit 920 is configured to send a request message to the base station to obtain the number of antenna ports of the interfering cell, where the request message carries the PCI of the interfering cell;

The receiving unit 930 is configured to receive a response message sent by the base station to the request message, where the response message carries the PCI of the interfering cell and the number of antenna ports of the interfering cell;

The CRS position acquiring unit 940 is configured to acquire the cell reference signaling CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports of the interfering cell;

The interference control unit 950 is configured to perform interference control according to the CRS position information, for example, subtract the signal received from the interfering cell from the signal obtained at the CRS position, or discard the signal obtained at the CRS position Signal.

According to the embodiment of the present invention, the received signal strength may be represented by RSRP or RSRQ.

Similar to the user equipment 500 shown in FIG. 5 , according to an embodiment of the present invention, before performing the neighbor cell measurement, the measuring unit 910 is further configured to perform serving cell signal quality measurement, so as to obtain a measurement value representing the serving cell signal quality , when the measured value drops below the first threshold, performing the neighbor cell measurement.

Similar to the user equipment 500 shown in FIG. 5, according to an embodiment of the present invention, the signal quality measurement of the serving cell performed by the measurement unit 910 includes a channel quality indicator CQI measurement, and the measurement value is a signal-to-interference-noise ratio SINR value, or

The performing the signal quality measurement of the serving cell performed by the measurement unit includes radio resource management RRM measurement, and the measurement value is a reference signal reception quality RSRQ value.

Similar to the user equipment 500 shown in FIG. 5 , according to an embodiment of the present invention, in performing the neighbor cell measurement, the measurement unit 910 selects the amount of the RSRP of the measured neighbor cell that is greater than the RSRP of the serving cell as the second threshold At least one neighboring cell is used as the interfering cell.

Similar to the user equipment 500 shown in FIG. 5 , according to an embodiment of the present invention, in performing the neighbor cell measurement, the measurement unit 910 selects the RSRQ of the measured neighbor cell that is greater than the RSRQ of the serving cell as the second threshold At least one neighboring cell is used as the interfering cell.

According to the embodiment of the present invention, the receiving unit 930 is further configured to receive an interference control message sent by a base station, where the interference control message includes the first threshold and the second threshold.

Fig. 10 is a schematic structural diagram of another base station 1000 according to an embodiment of the present invention. The base station 1000 may serve as eNB1 in implementing the methods in the foregoing embodiments of the present invention. As shown in Figure 10, the base station 1000 includes:

The X2 request unit 1010 is configured to send an X2 establishment request message to the second base station, wherein the X2 establishment request message carries the PCI and the number of antenna ports of the serving cell of the base station 1000, and/or, carries the number of antenna ports of the base station 1000 CSI-RS information,

so that the second base station obtains the CRS position of the base station 1000 according to the PCI of the serving cell of the base station 1000 and the number of antenna ports, and judges whether there is a CRS position of the serving cell under the second base station that matches the The CRS position of the base station 800 conflicts, and/or judges according to the CSI-RS of the base station 800 whether the CSI-RS of the second base station collides with the CSI-RS of the base station 1000;

The control unit 1020 is configured to change the PCI of the serving cell of the base station 1000 and/or change the CSI-RS of the base station when the judgment result is that there is a CRS position conflict and/or the CSI-RS conflict.

According to an embodiment of the present invention, as shown in FIG. 11 , the base station 1000 may further include:

The X2 response unit 1030 is configured to receive the X2 setup response message sent by the second base station, wherein the X2 setup response message carries a request to the base station 800 to change the PCI of its serving cell and/or to change the CSI of the base station 1000 -RS request information,

The control unit 1020 changes the PCI of the serving cell of the base station 1000 and/or changes the CSI-RS of the base station 800 according to the request information for changing the PCI of the serving cell and/or changing the CSI-RS of the base station 1000. RS;

The sending unit 1040 is configured to send a configuration update message to the second base station, where the configuration update message carries the changed PCI of the serving cell of the base station 800 and/or the changed CSI-RS of the base station 1000 .

According to another embodiment of the present invention, as shown in FIG. 12 , different from the embodiment shown in FIG. 11 , the base station 1000 may include:

An offset unit 1050, configured to receive a time symbol offset message sent by the second base station, where the time symbol offset message carries a time symbol offset value;

The control unit 1020 offsets the PCI of the serving cell of the base station 1000 and/or offsets the CSI-RS of the base station 800 according to the time symbol offset value in the time symbol offset message.

Fig. 13 is a schematic structural diagram of another base station 1300 according to an embodiment of the present invention. The base station 1300 may serve as eNB2 in implementing the methods in the foregoing embodiments of the present invention. As shown in Figure 11, the base station 1300 includes:

The receiving unit 1310 is configured to receive an X2 establishment request message sent by the first base station, wherein the X2 establishment request message carries the PCI and the number of antenna ports of the serving cell of the first base station, and/or carries the CSI of the first base station - RS information;

The conflict determination unit 1320 is configured to obtain the CRS position of the first base station according to the PCI of the serving cell of the first base station and the number of antenna ports, and determine whether there is a CRS position of the serving cell under the base station 1300 that is consistent with the number of antenna ports. The CRS position of the first base station conflicts, and/or judges whether the CSI-RS of the base station 1300 conflicts with the CSI-RS of the first base station according to the CSI-RS of the first base station;

The control unit 1330 is configured to change the PCI of the serving cell of the base station 1300 and/or change the CSI-RS of the base station when the judgment result is that there is a CRS position conflict and/or the CSI-RS conflict.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

Those skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or May be integrated into another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

If the functions described above are realized in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), magnetic disk or optical disk and other media that can store program codes.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (8)

1. A disturbance control method, characterized in that, Determining at least one neighboring cell as an interfering cell through the violation and victim relationship between cells configured by the operation management and maintenance entity OAM; Obtain the number of PCI and antenna ports of the interfering cell; sending an interference control message to the UE, where the interference control message includes the PCI of the interfering cell and the number of antenna ports, and the interference control message is used to notify the UE according to the PCI of the interfering cell and the number of antenna ports, Acquire the CRS position of the interfering cell, and perform interference control according to the CRS position information. 2. The method according to claim 1, characterized in that, in the relationship between the offender and the victim, the cell that receives strong downlink interference is the victim cell, and the cell that interferes with other cells is the offending cell. 3. A disturbance control method, characterized in that, comprising: receiving an interference control message sent by the base station, where the interference control message includes the PCI of the interfering cell and the number of antenna ports; Acquiring the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports; Interference control is performed according to the CRS location information. 4. The method according to claim 3, wherein the performing interference control according to the CRS position information comprises: subtracting the signal received from the interfering cell from the acquired signal, or discarding the signal received from the interfering cell The signal obtained from the CRS position described above. 5. A base station, characterized in that the base station comprises: A determining unit, configured to determine the relationship between the violation and the victim of the serving cell and other neighboring cells configured through OAM, determine at least one violating neighboring cell as an interfering cell, and obtain the PCI and the number of antenna ports of the interfering cell; A sending unit, configured to send an interference control message to the UE, where the interference control message includes the PCI of the interfering cell and the number of antenna ports, and the interference control message is used to notify the UE to use the PCI of the interfering cell and the number of antenna ports. the number of antenna ports, acquire the CRS position of the interfering cell, and perform interference control according to the CRS position information. 6 . The base station according to claim 5 , wherein, in the relationship between the offender and the victim, the cell subjected to strong downlink interference is the victim cell, and the cell interfering with other cells is the offending cell. 7. A user equipment, characterized in that, comprising: a receiving unit, configured to receive an interference control message sent by the base station, where the interference control message includes the PCI of the interfering cell and the number of antenna ports; A CRS position acquiring unit, configured to acquire the CRS position of the interfering cell according to the PCI of the interfering cell and the number of antenna ports; An interference control unit, configured to perform interference control according to the CRS location information. 8. The user equipment according to claim 7, wherein the interference control unit is configured to subtract the signal received from the interfering cell from the obtained signal, or discard the signal obtained at the CRS position Signal.