CN101686550B - Inter-cell interference suppression method, system and base station and user terminal - Google Patents

Abstract

The embodiment of the invention discloses a method, system, base station, and user terminal for suppressing inter-cell interference, and relates to the communication field. It solves the problem that a large amount of scheduling information needs to be transmitted between cell base stations, resulting in excessive occupation of network communication resources. The inter-cell interference suppression method includes: determining an interfering cell; obtaining scheduling information of an interfering terminal satisfying a terminal constraint condition in the interfering cell; Interference suppression operation. The technical solutions provided by the embodiments of the present invention can be applied in, for example, 3G or next generation wireless networks.

Description

Inter-cell interference suppression method, system, base station, and user terminal

technical field

The present invention relates to the communication field, in particular to a method, device and system for suppressing inter-cell interference.

Background technique

Existing cellular mobile communication systems (such as 3G systems) generally adopt a method of frequency reuse to avoid inter-cell interference (Inter-cell Interference, ICI). Wherein, the frequency reuse coefficient is a specific value: 1, 3 or 7. When the frequency reuse coefficient is set to 3 or 7, inter-cell interference can be effectively suppressed, but at this time, the spectrum efficiency used by each cell is low ( only 1/3 or 1/7 of the total spectral efficiency). In order to improve the spectrum utilization of wireless resources, under normal circumstances, the frequency reuse factor is set to 1, and each cell can use all frequency bands to transmit information. However, in this case, inter-cell interference will occur, especially when two When two adjacent cells use the same spectrum resources, strong inter-cell interference will be generated, and the service quality of users at the edge of the cell will be reduced.

At present, inter-cell interference can be suppressed mainly in three ways, namely: interference randomization, interference coordination, and interference cancellation. Wherein, the interference randomization cannot reduce the energy of interference, but it can randomize the interference into "white noise", thereby suppressing the harm of inter-cell interference, which is also called "interference whitening"; the interference coordination can coordinate the original cell and The frequency resources and power resources used by the interfering cell make the original cell and the interfering cell use different frequency resources and power resources, so as to achieve the purpose of suppressing inter-cell interference; the interference elimination comes from multi-user detection technology, which can eliminate interference The cell's signal is demodulated, decoded, replicated, and subtracted from the signal received by the original cell.

In the prior art, the method of transmitting channel information and user information between the original cell and the base station of the interfering cell transmits the scheduling information of the interfering cell to the original cell, and the base station of the original cell can perform corresponding interference suppression operations according to the scheduling information, such as interference coordination or Interference cancellation operations, etc.

In the process of implementing the present invention, the inventors found that the prior art has at least the following problems: a large amount of scheduling information needs to be transmitted between base stations, which occupies too many network resources.

Contents of the invention

Embodiments of the present invention provide an inter-cell interference suppression method, system, base station, and user terminal, which occupy less network resources.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

A method for suppressing inter-cell interference, comprising: determining an interfering cell; obtaining scheduling information of interfering terminals in the interfering cell that meet terminal constraint conditions; The user terminal performs an interference suppression operation.

A base station, comprising:

A terminal constraint condition storage unit, used for storing terminal constraint conditions;

an interfering cell determining unit, configured to determine an interfering cell;

a scheduling information acquiring unit, configured to acquire scheduling information of an interfering terminal satisfying a terminal constraint condition in the interfering cell;

The interference suppression unit is configured to perform an interference suppression operation on user terminals satisfying the terminal constraint conditions in the original cell according to the scheduling information of the interfering terminals.

An inter-cell interference suppression system, comprising:

The base station of the original cell is used to determine the interfering cell, obtain the scheduling information of the interfering terminal satisfying the terminal constraint condition in the interfering cell, and interfere with the user terminal satisfying the terminal constraint condition in the original cell according to the scheduling information of the interfering terminal Inhibit operation;

More than one interfering cell base station is used to obtain the scheduling information of the interfering terminal satisfying the terminal constraint condition, and send the scheduling information to the original cell base station.

The inter-cell interference suppression method, device, and system provided by the embodiments of the present invention have preset terminal constraint conditions, so when transmitting scheduling information, only the scheduling information of interfering terminals that meet the terminal constraint conditions can be transmitted. In the prior art, fewer resources are occupied by the transmission of scheduling information.

Embodiments of the present invention also provide a method, device and system for suppressing inter-cell interference, which occupy less network resources.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

A method for suppressing interference between cells, comprising: receiving identification information of an interfering terminal; obtaining scheduling information of the interfering terminal according to the identification information; obtaining an interference signal of the interfering terminal according to the scheduling information; receiving the interference signal from a user terminal eliminated from the incoming signal.

A user terminal, comprising:

An identification information receiving unit, configured to receive identification information of an interfering terminal;

a scheduling information acquiring unit, configured to acquire scheduling information of an interfering terminal according to the identification information;

An interference signal acquiring unit, configured to acquire an interference signal of an interfering terminal according to the scheduling information;

The interference elimination unit is configured to eliminate the interference signal from the signal received by the user terminal.

An inter-cell interference suppression system, comprising:

The first base station is configured to send identification information of the interfering terminal to the user terminal;

The second base station is configured to receive the scheduling information of the interfering terminal obtained by the user terminal according to the identification information of the interfering terminal, obtain an interference signal according to the scheduling information, and cancel the interference signal from the signal of the user terminal.

In the inter-cell interference suppression method, device and system provided by the embodiments of the present invention, the user terminal in the original cell can obtain the scheduling information of the interfering terminal according to the received identification information of the interfering terminal, and obtain the interference signal according to the scheduling information to perform interference elimination Operation, compared with the prior art, less network resources are occupied by the transmission of identification information of interfering terminals, and the purpose of saving network resources is achieved.

Description of drawings

FIG. 1 is a flowchart of a method for suppressing inter-cell interference provided by an embodiment of the present invention;

FIG. 2 is a flow chart of the first embodiment of the inter-cell interference suppression method provided by the embodiment of the present invention;

FIG. 3 is a flow chart of the second embodiment of the inter-cell interference suppression method provided by the embodiment of the present invention;

FIG. 4 is a first schematic structural diagram of a base station provided by an embodiment of the present invention;

FIG. 5 is a second structural schematic diagram of a base station provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of the interference cancellation unit 4042 in the base station provided by the embodiment of the present invention shown in FIG. 5;

FIG. 7 is a schematic structural diagram of an inter-cell interference suppression system provided by an embodiment of the present invention;

FIG. 8 is a flowchart of a method for suppressing inter-cell interference according to another embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a user terminal provided by an embodiment of the present invention;

Fig. 10 is a schematic structural diagram of an inter-cell interference suppression system provided by another embodiment of the present invention.

Detailed ways

In order to solve the problem in the prior art that when inter-cell interference suppression is performed, a large amount of scheduling information needs to be transmitted between cell base stations, resulting in too many occupied network communication resources, an embodiment of the present invention provides an inter-cell interference suppression method, device and system.

The cell described in the embodiment of the present invention may be an actual cell, or a virtual cell composed of more than one access point (AP). In the following embodiments, it is assumed that the cell is an actual cell. Example to illustrate.

As shown in Figure 1, the inter-cell interference suppression method provided by the embodiment of the present invention includes:

Step 101, determine an interfering cell.

In this embodiment, the step 101 can determine the interfering cell by two methods, one is: determine the interfering cell according to the cell ID information of the interfering cell pre-stored on the base station of the original cell; the other is: receive the interfering cell The cell ID information of the cell, and determine the interfering cell according to the cell ID information. The step 101 may determine interfering cells by any one or combination thereof.

The pre-stored cell ID information of the interfering cell may be stored in a static manner, such as: during network planning; it may also be stored in a semi-static manner, such as: by the interfering cell through explicit signaling Or implicitly notify the base station of the original cell. The pre-stored cell ID information of the interfering cell can be updated, and the specific update method can be the same as the storage method introduced above, which will not be repeated here.

Step 102, obtaining scheduling information of interfering terminals satisfying terminal constraints in the interfering cell, including:

First, determine the interfering terminal that satisfies the terminal constraints;

The terminal constraint conditions may be set according to the signal strength of the cell received by the UE, such as: according to the strength of the cell signal received by the UE, the UEs in the cell are divided into several groups, including: general UE groups and Interference-suppressed UE group, etc., constrain the interfering terminal to be located in the interference-suppressed UE group; it can also be set according to the physical location of the UE; it can also be set in other ways, and it is not performed here for each case repeat;

In this embodiment, the base station of the original cell can obtain the UE ID (identification information) of the interfering terminal satisfying the terminal constraint conditions of the interfering cell in advance in a static or semi-static manner, and determine the interfering terminal according to the UE ID; The UE ID sent in real time determines the interfering terminal, where the UE ID can be carried in the scheduling information or transmitted separately. Wherein, the interfering cell determines the interfering terminal according to the terminal constraints, and sends the determined UE ID of the interfering terminal to the base station of the original cell in real time, and the base station of the original cell determines the interfering terminal according to the UE ID;

Then, the scheduling information of the interfering terminal is acquired.

The base station of the original cell can obtain the channel sequence information bound to the interfering cell ID according to the interfering cell ID obtained when the interfering cell is determined in step 101, and obtain the scheduling information of the interfering terminal in the interfering cell according to the sequence information. In this embodiment, the original cell base station may also directly receive the scheduling information of the interfering terminal from the interfering cell base station.

Wherein, the scheduling information may include any one or a combination of two or more of the following information: resource block information (RB), channel information, sequence information, modulation and coding scheme information (MCS), antenna mode information, multiple-input multiple Output (MIMO) mode information, pilot information (RS), frequency hopping pattern information or UE ID, etc.

Step 103: Perform an interference suppression operation on user terminals satisfying the terminal constraints in the original cell according to the scheduling information of the interfering terminals, including: performing interference coordination on the user terminals, for example: according to the scheduling information of the interfering terminals , scheduling the channels used by the interfering terminal and the user terminal on different RBs; another example: according to the scheduling information of the interfering terminal, the original cell and the interfering cell jointly allocate resources for the user terminal, such as RB resources or Other resources; another example: according to the scheduling information of the interfering terminal, schedule the channels used by the interfering terminal and the user terminal on the same RB, and use different powers; or according to the scheduling information of the interfering terminal, obtain interfere with the interference signal of the terminal, and perform interference cancellation on the user terminal.

In this embodiment, when using the interference cancellation method to perform interference suppression on the user terminal, if the channel of the interfering terminal is different from the RB originally used by the user terminal, it may also include: according to the interference terminal Scheduling information of the interference terminal and the user terminal are scheduled to the same or an RB that has an inclusion relationship.

In the above embodiment, since the terminal constraint condition is set in advance, less scheduling information is transmitted when inter-cell interference suppression is performed. Compared with the prior art, fewer resources are occupied by the transmission of the scheduling information.

In another embodiment provided by the present invention, in order to reduce the amount of scheduling information transmitted between the base station of the original cell and the base station of the interfering cell, and save network communication resources, a scheduling resource constraint condition can also be set in advance, and the scheduling resource constraint condition can be applied to the above The scheduling resources described in the embodiments are constrained. For example: constraining RB resources, including constraining the position or size of RB resources; constraining MCS, including constraining MCS type or scheduling period; constraining MIMO modes, such as diversity/multiplexing/codebook, etc., Constrain; constrain RS resources or constrain channel information, etc.

The scheduling resource constraints set in the embodiment of the present invention are described below through several specific examples:

1. Constrain RB resources.

Divide RB resources into several groups, for example, according to the use of RBs: RB groups that support partial frequency division multiplexing (FFR), RB groups that support interference cancellation, and general RB groups, etc.; for another example, according to the channels allocated by RBs: Control channel high transmit power RB, control channel low transmit power RB, data channel RB, etc.; wherein, the size of the RB resource group in the original cell and the interfering cell is the same, or the RB resource group of the interfering cell is included in the RB resource group of the original cell .

Constrain the RBs used for inter-cell interference suppression to one or several groups of the above groupings, for example: constrain the use of RB resources of the RB group supporting interference cancellation for inter-cell interference suppression.

By constraining the RB resources, the interfering cell does not need to transmit the RB information used by the interfering terminal to the original cell through the scheduling information in real time, reducing the network communication resources occupied by the transmission scheduling information.

2. Constrain RS resources.

Divide the RS into several groups, such as: RS groups that support interference cancellation and general RS groups, etc., constrain the RSs used for inter-cell interference suppression to one or several groups in the above groups, such as: constrain inter-cell interference Interference suppression uses an RS group that supports interference cancellation. The RSs in this group are kept as orthogonal as possible, and the allocation of RSs changes from cell-specific to UE-specific or UE-group-specific. specific)

By constraining the RS resources, the interfering cell does not need to transmit the RS information used by the interfering terminal to the original cell through the scheduling information in real time, reducing the network communication resources occupied by the transmission scheduling information, and the base station of the original cell can use the blind detection technology according to the RS resource The constraint condition detects the RS used, which reduces the complexity of blind detection and is easier to implement.

3. Constrain the MCS.

Defining one or more sets of MCS tables, when performing inter-cell interference suppression, the base station of the original cell can use a limited number of blind detections to detect the MCS used by the interfering cell from the defined one or more sets of MCS tables;

The scheduling period of the MCS can also be constrained, and the number of transmitted MCSs can be reduced by increasing the scheduling period of the MCS, so as to save network communication resources.

4. Constrain the channel information.

The constrained channel information is channel statistical information within a statistical period, and the base station of the original cell can be constrained to directly estimate the channel of the interfering cell to obtain channel information.

By estimating the channel information, the amount of channel information transmitted by the base station of the original cell and the base station of the interfering cell can be reduced, thereby achieving the purpose of saving network communication resources.

The foregoing is only an explanation of some of the content of the scheduling resource constraints, and details of each content will not be repeated here.

In this embodiment, the scheduling resource constraint conditions may be statically stored in the base station of the original cell and the base station of the interfering cell in advance, such as storing statically in the base station of the original cell and the base station of the interfering cell during network planning; The X2 interface between the base station and the base station of the interfering cell is semi-statically stored in the base station of the original cell and the base station of the interfering cell. For example, when the base station of the original cell pre-stores the scheduling resource constraints, the base station of the original cell can transfer The scheduling resource constraints are sent to the interfering cell base station, and the interfering cell base stations store the scheduling resource constraints.

When both the base station of the original cell and the base station of the interfering cell store the scheduling resource constraint conditions, the base station of the interfering cell can perform scheduling settings for the interfering terminal according to the constraint condition of the scheduling resource, and send the scheduling information of the interfering terminal to the base station of the original cell; The interfering cell base station may not send the scheduling information of the interfering terminal to the original cell base station after scheduling the interfering terminal according to the scheduling resource constraint conditions, and the original cell base station uses blind detection technology to obtain the interference terminal according to the scheduling resource constraint conditions. Scheduling information of the interfering terminal.

In this embodiment, the scheduling information of the interfering terminal transmitted from the interfering cell to the original cell is further restricted, so that less network resources are occupied by the transmission of the scheduling information, and the purpose of saving network resources is further achieved.

The inter-cell interference suppression method provided by the embodiments of the present invention described above can perform interference suppression on various channels, for example: perform interference suppression on the uplink control channel of the user terminal, or perform interference suppression on the uplink data channel of the user terminal, etc. . In order to enable those skilled in the art to understand the technical solutions provided by the embodiments of the present invention more clearly, the method for suppressing inter-cell interference provided by the embodiments of the present invention will be described in detail below through specific embodiments.

Embodiment 1: Perform interference suppression on the uplink control channel of the user terminal.

Since the uplink control channel is not scrambled, there are few types of MCS changes, and it is a code division and frequency division channel, so as shown in Figure 2, the specific steps for interference suppression include:

Step 201, determine an interfering cell.

In this embodiment, the interfering cell can be determined according to the cell ID information of the interfering cell pre-stored in the original cell; the cell ID information sent by the interfering cell can also be received, and the interfering cell can be determined according to the cell ID information; or according to the above two methods The combination determines the interfering cell.

Step 202, determine the user terminals that need interference suppression in the original cell, and the interfering terminals that need interference suppression in the interfering cell.

It can be determined according to the pre-stored terminal constraint conditions in the original cell and the interfering cell. After the determination, the interfering cell can send the UE ID of the interfering terminal to the original cell in a static or semi-static manner, and the original cell can also pass Sending the UE ID of the user terminal to the interfering cell in a static or semi-static manner.

Step 203, the original cell receives the scheduling information of the interfering terminal sent by the interfering cell, including:

The original cell obtains the channel sequence information bound to the cell ID according to the cell ID information obtained in step 201, and receives the scheduling information of the interfering terminal sent by the interfering cell according to the channel sequence information.

In this embodiment, the scheduling information includes: cell ID, RB, sequence shift, antenna mode and UE ID.

Step 204, referring to the scheduling information of the interfering terminal received in step 203 and the scheduling information of the user terminal of the original cell, performing an interference suppression operation on the user terminal of the original cell.

In this embodiment, the interference suppression operation may be an interference coordination operation or an interference cancellation operation.

When operating for interference coordination, it may specifically include: scheduling the uplink control channels of the interfering terminal and the user terminal on different RBs; or the original cell and the interfering cell jointly allocate resources for the user terminal; The uplink control channel of the terminal is scheduled to the same RB, and the signals are transmitted with different powers.

When it is an interference cancellation operation, it may specifically include: according to the channel information of the uplink control channel of the interfering terminal, acquiring a user terminal independent from the uplink control channel of the interfering terminal; according to the scheduling information of the interfering terminal, such as RB , sequence shift and UE ID, etc., the interfering terminal and the user terminal with the same RB will be used to form an interference suppression pair (such as forming MU-MIMO); according to the scheduling information of the interfering terminal, the interference signal of the interfering terminal is obtained, and the The interfering signal is canceled from the user terminal's signal.

When performing the above-mentioned interference cancellation operation, if the uplink control channel of the interfering terminal is different from the RB of the user terminal, the interfering terminal and the user terminal may be scheduled to the same or containing relationship according to the scheduling information of the interfering terminal. On the RB, the interference terminal and the user terminal form an interference suppression pair to perform an interference cancellation operation.

The channel information used in this embodiment may be statistical or instantaneous channel information. When the channel information is statistical channel information, network communication resources occupied by transmitting channel information between the original cell and the interfering cell can be reduced. The channel information is obtained by channel estimation of the interfering cell directly by the original cell. In actual use, the channel information may also be obtained through information sent by the interfering cell, for example, through scheduling information sent by the interfering cell.

Embodiment 2: Perform interference suppression on the uplink data channel of the user terminal.

Since the uplink data channel needs scrambling, there are many types of MCS changes, and it is only a frequency division channel, so as shown in Figure 3, the specific steps for interference suppression include:

Wherein, the steps 301 and 302 are the same as the steps 201 and 202 in Embodiment 1, and will not be repeated here.

Step 303, setting a scheduling resource constraint condition, and saving the scheduling resource constraint condition in the original cell and the interfering cell.

The scheduling resource constraints may include: constraints on the location and size of RB resources, constraints on the type and period of the scheduled MCS, constraints on MIMO modes, constraints on RSs, and the like. In this embodiment, the cycle of the MCS can be set relatively slowly, thereby reducing the number of times the MCS is transmitted.

The scheduling resource constraints can be pre-stored in the original cell and the interfering cell in a static manner, or can be transmitted from the original cell to the interfering cell through the X2 interface in a semi-static manner, and of course can also be transmitted from the interfering cell to the original cell. I won't go into details here.

Step 304, the original cell receives the interfering terminal scheduling information sent by the interfering cell.

In this embodiment, the interfering cell performs scheduling setting for the interfering terminal according to the scheduling resource constraints saved in step 303, and sends the set scheduling information to the original cell.

Step 305, refer to the scheduling information of the interfering terminal received in step 304 and the scheduling information of the user terminal in the original cell, and perform an interference suppression operation on the user terminal in the original cell. For specific steps, refer to step 204 shown in FIG. 2 described here I won't go into details.

The inter-cell interference suppression method provided by the embodiment of the present invention can also perform interference suppression on a downlink channel, such as a downlink control channel or a downlink data channel, and its specific implementation method is basically the same as the above-mentioned embodiment 1 and embodiment 2, and will not be repeated here. .

In order to save network communication resources, when the channel information of the uplink control channel or the uplink data channel is known in advance, the channel reciprocity of the channel can be used to obtain the channel information of the downlink control channel or the downlink data channel.

In the above two embodiments, when the steps 202 and 302 determine the user terminal in the original cell and the interfering terminal in the interfering cell, it may also include the step of judging whether to perform interference cancellation on the user terminal that meets the constraint conditions of the interfering terminal , the steps 204 and 305 can perform corresponding interference suppression operations according to the judgment result, and the specific steps can include:

First set the judgment threshold, when the signal strength difference between the signal strength of the original cell user terminal and the interference terminal of the interfering cell is less than the judgment threshold, in steps 204 and 305, the user terminal of the original cell is executed to eliminate interference; otherwise In steps 204 and 305, other operations are performed on the user terminal in the original cell, such as directly treating it as interference, not performing interference cancellation, or using FFR.

Wherein, the determination threshold may be obtained through negotiation between the original cell and the interfering cell.

In the inter-cell interference suppression method provided by the embodiment of the present invention, since the terminal constraint condition and the scheduling resource constraint condition are set in advance, less scheduling information is transmitted when inter-cell interference suppression is performed. Compared with the prior art, the transmission scheduling information Uses fewer resources.

Corresponding to the above method, as shown in FIG. 4 , an embodiment of the present invention also provides a base station, including:

A terminal constraint condition storage unit 401, configured to store the terminal constraint condition;

An interfering cell determining unit 402, configured to determine an interfering cell;

A scheduling information acquiring unit 403, configured to acquire scheduling information of interfering terminals satisfying terminal constraint conditions in the interfering cell;

The interference suppression unit 404 is configured to perform an interference suppression operation on user terminals satisfying the terminal constraint conditions in the original cell according to the scheduling information of the interfering terminal. For specific steps, please refer to the inter-cell interference suppression method provided in the embodiment of the present invention mentioned.

Further, as shown in FIG. 5, the scheduling information acquiring unit 403 may include:

The receiving unit 4031 is configured to receive the scheduling information of the interfering terminal that meets the terminal constraint condition sent by the interfering cell.

Further, as shown in FIG. 5, the base station may further include:

A scheduling resource constraint condition storage unit 405, configured to store the scheduling resource constraint condition;

Then the scheduling information acquiring unit 403 may also include:

The acquiring unit 4032 is configured to acquire the scheduling information of the interfering terminal satisfying the terminal constraint condition in the interfering cell by using a blind detection technique according to the scheduling resource constraint condition acquired from the scheduling resource constraint condition storage unit 405 .

Further, as shown in FIG. 5, the interference suppression unit 404 may include:

The interference coordinating unit 4041 is configured to schedule the channels used by the interfering terminal and the user terminal on different resource blocks according to the scheduling information of the interfering terminal, or the original cell and the interfering cell jointly allocate resources for the user terminal , or schedule the channels used by the interfering terminal and the user terminal on the same resource block, and use different powers; and/or

The interference canceling unit 4042 is configured to acquire the interference signal of the interfering terminal according to the scheduling information of the interfering terminal, and perform interference canceling on the user terminal.

Further, as shown in FIG. 5, the base station may further include:

An interference cancellation judging unit 406, configured to judge whether to perform interference cancellation on the user terminal satisfying the constraint condition of the interfering terminal;

Then the interference canceling unit 4042 is configured to obtain an interference signal of the interfering terminal according to the scheduling information of the interfering terminal when the judgment result is to perform interference canceling on the user terminal that satisfies the constraint condition of the interfering terminal, and perform the interference on the user terminal. The terminal performs interference cancellation.

Further, as shown in FIG. 6, the interference elimination unit 4042 may include:

A user terminal acquiring unit 601, configured to acquire a user terminal that is channel independent from the interfering terminal according to the channel information of the interfering terminal;

The interference suppression pair forming unit 602 is configured to form an interference suppression pair with the interference terminal and the user terminal using the same resource block according to the scheduling information of the interference terminal;

The interference signal canceling unit 603 is configured to acquire the interference signal of the interference terminal according to the scheduling information of the interference terminal, and cancel the interference signal from the signal of the user terminal.

In the base station provided by the embodiment of the present invention, since the terminal constraint condition and the scheduling resource constraint condition are set in advance, less scheduling information is transmitted when performing inter-cell interference suppression. Compared with the prior art, the resources occupied by transmitting scheduling information less.

As shown in FIG. 7, an embodiment of the present invention also provides an inter-cell interference suppression system, including:

More than one interfering cell base station 701, configured to obtain the scheduling information of the interfering terminal meeting the terminal constraint conditions, and send the scheduling information to the original cell base station;

The original cell base station 702 is configured to determine an interfering cell, acquire scheduling information of an interfering terminal satisfying a terminal constraint condition in the interfering cell, and perform a user terminal meeting the terminal constraint condition in the original cell according to the scheduling information of the interfering terminal Interference suppression operation.

Further, when the scheduling resource constraint condition is set in advance, the base station 702 of the original cell may be specifically configured to use blind detection technology to obtain the information of the interfering terminal meeting the terminal constraint condition in the interfering cell according to the scheduling resource constraint condition. Scheduling information.

When the scheduling resource constraints are set in advance, the one or more interfering cell base stations 701 can also be used to obtain the scheduling information of the interfering terminals satisfying the terminal constraints according to the preset scheduling resource constraints, and send the scheduling information to The base station of the original cell.

In the inter-cell interference suppression system provided by the embodiment of the present invention, since the terminal constraint conditions and scheduling resource constraint conditions are set in advance, less scheduling information is transmitted when inter-cell interference suppression is performed. Compared with the prior art, the transmission scheduling information Uses fewer resources.

In order to solve the problem in the prior art that when inter-cell interference suppression is performed, a large amount of scheduling information needs to be transmitted between cell base stations, resulting in too many occupied network communication resources, another embodiment of the present invention also provides an inter-cell interference suppression method , devices and systems.

The cell described in the embodiment of the present invention may be an actual cell, or a virtual cell composed of more than one access point (AP). In the following embodiments, it is assumed that the cell is an actual cell. Example to illustrate.

As shown in Figure 8, the interference suppression method provided by the embodiment of the present invention includes:

Step 801, a user terminal receives identification information of an interfering terminal.

Step 802, the user terminal obtains scheduling information of the interfering terminal according to the identification information, wherein the scheduling information may be sent by the interfering cell to the user terminal through a physical downlink control channel (PDCCH).

Step 803, the user terminal obtains the interference signal of the interfering terminal according to the scheduling information.

Step 804, the user terminal cancels the interference signal from the signal received by the user terminal.

In this embodiment, the identification information of the interfering terminal is UE ID, and the UE ID may be sent to the user terminal by the base station of the interfering cell, or may be sent by the base station of the interfering cell to the base station of the original cell where the user terminal is located, Then the original cell base station sends it to the user terminal. The UE ID can be sent to the user terminal through broadcast or PDCCH.

In this embodiment, the user terminal may specifically acquire the interference signal of the interfering terminal by forming an interference suppression pair with the interfering terminal, and the specific acquisition method will not be repeated here.

When the inter-cell interference suppression method provided by the embodiment of the present invention is applied to an uplink channel, such as when applied to an uplink control channel or an uplink data channel, it may also include:

Sending the scheduling information of the interfering terminal to the base station of the original cell, so that the base station of the original cell acquires an interference signal according to the scheduling information, and cancels the interference signal from the uplink signal of the user terminal.

In the inter-cell interference suppression method provided by the embodiment of the present invention, the user terminal in the original cell can obtain the scheduling information of the interfering terminal according to the received identification information of the interfering terminal, and obtain the interfering signal according to the scheduling information to perform an interference cancellation operation, which is different from the existing Compared with the existing technology, the network resources occupied by the transmission of the identification information of the interfering terminal are less, and the purpose of saving network resources is achieved; the user terminal can receive the identification information of the interfering terminal, and obtain the scheduling information of the interfering terminal according to the identification information, The interference signal is acquired according to the scheduling information, and the interference signal is eliminated from the received signal, which solves the problem in the prior art that interference cancellation cannot be performed on the user terminal because the user terminal cannot acquire the interference signal.

Corresponding to the method, as shown in FIG. 9 , an embodiment of the present invention further provides a user terminal, including:

An identification information receiving unit 901, configured to receive identification information of an interfering terminal;

A scheduling information acquiring unit 902, configured to acquire scheduling information of the interfering terminal according to the identification information;

An interference signal acquiring unit 903, configured to acquire an interference signal of an interfering terminal according to the scheduling information;

The interference elimination unit 904 is configured to eliminate the interference signal from the signal received by the user terminal.

Further, as shown in FIG. 9, the user terminal may further include:

The scheduling information sending unit 905 is configured to send the scheduling information of the interfering terminal to the base station of the original cell, so that the base station of the original cell acquires an interference signal according to the scheduling information, and cancels the interference signal from the signal of the user terminal.

The user terminal provided by the embodiment of the present invention can obtain the scheduling information of the interfering terminal according to the received identification information of the interfering terminal, and obtain the interfering signal according to the scheduling information to perform an interference cancellation operation. Compared with the prior art, the identification of the transmitting interfering terminal The network resources occupied by the information are less, and the purpose of saving network resources is achieved; the user terminal can receive the identification information of the interfering terminal, obtain the scheduling information of the interfering terminal according to the identification information, obtain the interference signal according to the scheduling information, and send The interference signal is eliminated from the received signal, which solves the problem in the prior art that interference cancellation cannot be performed on the user terminal because the user terminal cannot obtain the interference signal.

As shown in FIG. 10, an embodiment of the present invention also provides an inter-cell interference suppression system, including:

The first base station 1001 is configured to send identification information of the interfering terminal to the user terminal 1002;

The second base station 1003 is configured to receive the scheduling information of the interfering terminal obtained by the user terminal 1002 according to the identification information of the interfering terminal, obtain an interference signal according to the scheduling information, and convert the interference signal from the signal of the user terminal 1002 eliminated.

In the inter-cell interference suppression system provided by the embodiments of the present invention, the user terminal in the original cell can receive the identification information of the interfering terminal, obtain the scheduling information of the interfering terminal according to the identification information, and send the scheduling information to the second base station, and the The second base station acquires the interference signal according to the scheduling information to perform an interference cancellation operation. Compared with the prior art, the first base station only needs to transmit the identification information of the interfering terminal to the user terminal, and the transmission of the identification information occupies less network resources, which can achieve the purpose of saving network resources. Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, etc. disc or disc, etc.

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 (13)

1. an inter-cell interference restraint method, is characterized in that, comprising:

Determine interfered cell;

Obtain the schedule information of the interfered with terminal meeting end conswtraint condition in described interfered cell;

Schedule information according to described interfered with terminal carries out AF panel operation to the user terminal meeting described end conswtraint condition in former community;

The schedule information meeting the interfered with terminal of end conswtraint condition in the described interfered cell of described acquisition comprises:

Receive the schedule information meeting the interfered with terminal of end conswtraint condition that interfered cell sends; And/or

According to the scheduling resource constraints pre-set, adopt the schedule information meeting the interfered with terminal of end conswtraint condition in interfered cell described in blind Detecting technical limit spacing;

The described schedule information according to described interfered with terminal is carried out AF panel operation to the user terminal meeting described end conswtraint condition in former community and is comprised:

According to the schedule information of described interfered with terminal, the channel dispatch used by the user terminal meeting described end conswtraint condition in described interfered with terminal and former community is on different Resource Block; Or

According to the schedule information of described interfered with terminal, be the described user terminal Resources allocation meeting described end conswtraint condition in former community jointly by former community and interfered cell; Or

According to the schedule information of described interfered with terminal, the channel dispatch used by the user terminal meeting described end conswtraint condition in described interfered with terminal and former community is on identical Resource Block, and the power used is different; Or

According to the schedule information of described interfered with terminal, obtain the interference signal of interfered with terminal, interference is carried out to the user terminal meeting described end conswtraint condition in described former community and eliminates; Or

Described schedule information is sent in former community the user terminal meeting described end conswtraint condition, according to described schedule information, the interference signal of described interfered with terminal is eliminated from the signal received to make the user terminal meeting described end conswtraint condition in former community.

2. inter-cell interference restraint method according to claim 1, is characterized in that, describedly determines that interfered cell comprises:

According to the cell ID information of the interfered cell prestored, determine interfered cell; And/or

Receive the cell ID information that interfered cell sends, determine interfered cell according to this cell ID information.

3. inter-cell interference restraint method according to claim 1, is characterized in that, described schedule information comprises at least one information in following information:

Resource block information, channel information, sequence information, modulation coding mode information, antenna mode information, MIMO mode information, pilot frequency information, frequency hopping pattern information or Termination ID.

4. inter-cell interference restraint method according to claim 1, is characterized in that, also comprises:

Judge whether that carrying out interference to the user terminal meeting interfered with terminal constraints eliminates;

When judged result is when carrying out interference elimination to the described user terminal meeting interfered with terminal constraints, according to the schedule information of described interfered with terminal, obtain the interference signal of interfered with terminal, interference is carried out to the user terminal meeting described end conswtraint condition in described former community and eliminates.

5. the inter-cell interference restraint method according to claim 1 or 4, it is characterized in that, the described schedule information according to described interfered with terminal, obtains the interference signal of interfered with terminal, carries out interference elimination comprise the user terminal meeting described end conswtraint condition in described former community:

According to the channel information of described interfered with terminal, obtain and described interfered with terminal channel independently user terminal;

According to the schedule information of described interfered with terminal, by use the identical described interfered with terminal of Resource Block and with described interfered with terminal channel independently user terminal form AF panel pair;

According to the schedule information of described interfered with terminal, obtain the interference signal of described interfered with terminal, described interference signal is eliminated from the signal of described and described interfered with terminal channel independently user terminal.

6. inter-cell interference restraint method according to claim 5, it is characterized in that, the described schedule information according to described interfered with terminal, obtains the interference signal of interfered with terminal, carries out interference elimination also comprise the user terminal meeting described end conswtraint condition in described former community:

According to the schedule information of described interfered with terminal, by the scheduling of user terminals meeting described end conswtraint condition in described interfered with terminal and described former community to identical or have on the Resource Block of inclusion relation.

7. inter-cell interference restraint method according to claim 5, is characterized in that, described channel information is the channel information of statistics; This channel information is directly obtained the channel estimating of interfered cell by former community; Or by the information acquisition that interfered cell sends.

8. a base station, is characterized in that, comprising:

End conswtraint condition storage unit, for storage terminal constraints;

Interfered cell determining unit, for determining interfered cell;

Schedule information acquiring unit, for obtaining the schedule information of the interfered with terminal meeting end conswtraint condition in described interfered cell;

AF panel unit, carries out AF panel operation for the schedule information according to described interfered with terminal to the user terminal meeting described end conswtraint condition in former community;

Scheduling resource constraints memory cell, for memory scheduling resource constraint;

Described schedule information acquiring unit comprises:

Acquiring unit, for according to the scheduling resource constraints obtained from scheduling resource constraints memory cell, adopts the schedule information meeting the interfered with terminal of end conswtraint condition in interfered cell described in blind Detecting technical limit spacing;

Described AF panel unit comprises:

Interference coordination unit, for the schedule information according to described interfered with terminal, the channel dispatch described interfered with terminal and user terminal used is on different Resource Block, Huo Youyuan community and interfered cell are described user terminal Resources allocation jointly, or by described interfered with terminal with the channel dispatch that user terminal uses on identical Resource Block, and the power used is different; And/or

Interference cancellation unit, for the schedule information according to described interfered with terminal, obtains the interference signal of interfered with terminal, carries out interference eliminate described user terminal;

The interference signal of described interfered with terminal, also for described schedule information being sent in former community the user terminal meeting described end conswtraint condition, is eliminated according to described schedule information to make the user terminal meeting described end conswtraint condition in former community by described base station from the signal received.

9. base station according to claim 8, is characterized in that, described schedule information acquiring unit comprises:

Receiving element, for receiving the schedule information meeting the interfered with terminal of end conswtraint condition that interfered cell sends.

10. base station according to claim 8, is characterized in that, also comprises:

Judging unit is eliminated in interference, for judging whether that carrying out interference to the user terminal meeting interfered with terminal constraints eliminates;

Then described interference cancellation unit, for when judged result be to the described user terminal meeting interfered with terminal constraints carry out interference eliminate time, according to the schedule information of described interfered with terminal, obtain the interference signal of interfered with terminal, interference is carried out to described user terminal and eliminates.

11. 1 kinds of presence of intercell interference suppress system, it is characterized in that, comprising:

Base station, more than one interfered cell, for obtaining the schedule information of the interfered with terminal meeting end conswtraint condition, and sends to former cell base station by this schedule information;

Former cell base station, for determining interfered cell, obtain the schedule information of the interfered with terminal meeting end conswtraint condition in described interfered cell, the schedule information according to described interfered with terminal carries out AF panel operation to the user terminal meeting described end conswtraint condition in former community;

The schedule information meeting the interfered with terminal of end conswtraint condition that described former cell base station sends specifically for receiving interfered cell, and/or, according to the scheduling resource constraints pre-set, adopt the schedule information meeting the interfered with terminal of end conswtraint condition in interfered cell described in blind Detecting technical limit spacing;

Described former cell base station is specifically for the schedule information according to described interfered with terminal, and the channel dispatch used by the user terminal meeting described end conswtraint condition in described interfered with terminal and former community is on different Resource Block; Or according to the schedule information of described interfered with terminal, by former community and interfered cell jointly for meeting the described user terminal Resources allocation of described end conswtraint condition in former community; Or according to the schedule information of described interfered with terminal, the channel dispatch used by the user terminal meeting described end conswtraint condition in described interfered with terminal and former community is on identical Resource Block, and the power used is different; Or according to the schedule information of described interfered with terminal, obtain the interference signal of interfered with terminal, interference elimination is carried out to the user terminal meeting described end conswtraint condition in described former community; Or described schedule information is sent in former community the user terminal meeting described end conswtraint condition, the interference signal of described interfered with terminal is eliminated from the signal received according to described schedule information to make the user terminal meeting described end conswtraint condition in former community.

12. presence of intercell interference according to claim 11 suppress system, it is characterized in that, when pre-setting scheduling resource constraints, described former cell base station, specifically for according to described scheduling resource constraints, adopt the schedule information meeting the interfered with terminal of end conswtraint condition in interfered cell described in blind Detecting technical limit spacing.

13. presence of intercell interference according to claim 11 suppress system, it is characterized in that, when pre-setting scheduling resource constraints, base station, described more than one interfered cell, also for obtaining the schedule information meeting the interfered with terminal of end conswtraint condition according to the scheduling resource constraints pre-set, and this schedule information is sent to described former cell base station.