WO2010139137A1

WO2010139137A1 - Processing method and relay station for collaborative multiple input multiple output

Info

Publication number: WO2010139137A1
Application number: PCT/CN2009/073317
Authority: WO
Inventors: 魏巍; 郭阳
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-06-05
Filing date: 2009-08-18
Publication date: 2010-12-09
Also published as: CN101909299A

Abstract

A processing method and a relay station for collaborative multiple input multiple output (Co-MIMO) are disclosed by the present invention. The method comprises: the relay station receiving a collaborative base station (CBS) selection threshold from a base station, wherein said CBS selection threshold being used to indicate the maximum of interference signal intensity; when said relay station locating in cell edge of said base station, said relay station measuring said interference signal intensity and determining cells whose interference signal intensity is less than said CBS selection threshold as a CBS subset from a CBS set, wherein said CBS set being all the neighboring cell of said relay station. Through the present invention, the interference of inter-cell is reduced, and peak data rate and throughput of an edge user terminal in the cover area of the base station or the relay station are increased. Moreover, the result is enabled that the base station may dynamically select whether a subordinate relay station can participate in the operation of Co-MIMO.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a cooperative method of a Collaborative Multiple Input Multiple Output (Co-MIMO) and a relay station. BACKGROUND OF THE INVENTION In the next generation of broadband wireless communication networks, solving inter-cell interference in a wireless communication network is a key factor for improving throughput of user terminals (UT) and average user terminal throughput in a cell. In a relay network with a relay station (relay station), it effectively solves the base station (base station), the relay station and its attached user terminals and neighboring cell base stations, relay stations and their users. Inter-cell interference between terminals will also face challenges. In the relay network, since the relay station can serve as a special user terminal of the slave base station, at the same time, the relay station itself can be the same as the relay station, and after the slave base station obtains the time-frequency resource, the user terminal is allowed to access, forming a relay station as the center. The base station covers the relay network. Therefore, solving the interference problem between the base station and the relay station, the relay station and other relay stations is important for improving the throughput of the cell edge and the user terminal of the relay station edge and the average user terminal throughput. Currently, the Institute for Electrical and Electronic Engineers (IEEE) 802.16j, International Mobile Telecommunication Advance (IMT-Advance), WINNER (Wireless World Initiative) In the New Radio project, interference randomization, interference coordination, and interference cancellation are proposed to solve the problem of inter-cell interference. However, in order to achieve this, it is necessary to measure the interference in the system effectively and accurately. In order to solve this problem, various technologies are widely discussed in standardization organizations such as the 3rd Generation Partnership Project (3GPP) and IEEE802.16e. A typical example is the use of techniques including power control, flexible frequency reuse, macro diversity, inter-cell interference randomization with interference cancellation, and the like on the user terminal. These techniques can be used to improve the performance of multiple input multiple output (Multiple Input Multiple Output), which in turn improves peak data rate, average cell throughput, and cell edge user throughput, but is usually averaged. Loss of throughput or increased receiver complexity For the price. MIMO (Collaborative Multiple Input Multiple Output) is a 3GPP Long Term Evolution (LTE) proposed to effectively solve peak data rate, average cell throughput, and cell edge user throughput. The key technology of the problem. The idea is to perform joint MIMO transmission and reception between multiple cooperative base stations (Collaborative BS, CBS) and multiple user terminals on the same radio resource. Similar technologies in IEEE 802.16m have also been proposed by many companies, for example, the base station collaboration proposed by Mitsubishi, Al-City Alcatel Shanghai Bell proposed by Co-MIMO, Alcatel Lucent Network MIMO and Co-MIMO, etc. proposed by the Electronics and Telecommunications Research Institute (ETRI). The advantage of Co-MIMO is that inter-cell interference and noise signals can be converted into effective signals through inter-cell cooperation, especially for users at the cell edge, the throughput gain can reach 100%.

The basic concept of Co-MIMO is joint MIMO transmission and reception between multiple cooperating base stations and a single user terminal on the same radio resource. There are two basic characteristics:

(1) Each user terminal can be jointly served by a plurality of base stations by base station cooperation on the same radio resource. By doing so, the inter-cell interference can be mitigated or changed to useful signal power.

(2) Each base station can serve multiple user terminals on the same radio resource. Through such a rule. All sector throughput is improved. However, in the Co-MIMO implementation process, using the same resource to serve one user terminal in multiple coordinated base stations may cause waste of resources; in the uplink where inter-cell interference exists, when selecting simultaneously at the cell edge When the user terminal performs Co-MIMO, serious inter-cell interference may be caused, and the cell edge throughput, the peak rate, and the average cell throughput are significantly reduced. In particular, in the relay network, the dual characteristics of the base station and the user terminal of the relay station are not considered in the current Co-MIMO implementation process, and there is no relay station participating in the Co-MIMO processing method in the related art. Aiming at the problem that the relay station participates in the Co-MIMO processing method in the related art, and the user terminal at the cell edge in Co-MIMO causes inter-cell interference and thus affects the cell edge throughput and the peak rate, an effective solution has not been proposed yet. . SUMMARY OF THE INVENTION The present invention has been made in view of the problem of lacking a relay station to participate in a Co-MIMO processing method in the related art, and the problem that a cell edge user terminal causes inter-cell interference and thus affects cell edge throughput and peak rate in Co-MIMO. Accordingly, it is a primary object of the present invention to provide an improved Co-MIMO processing scheme to address at least one of the above problems. In order to achieve the above object, according to an aspect of the present invention, a processing method of cooperative multiple input and multiple output is provided. The cooperative multiple input multiple output processing method according to the present invention includes: the relay station receives a cooperative base station selection threshold from the base station, wherein the cooperative base station selection threshold is used to indicate the maximum value of the interference signal strength; in the case where the relay station is located at the cell edge of the base station The relay station measures the interference signal strength, and determines, from the set of cooperative base stations, that the interference signal strength is less than the cooperative base station selection threshold, and the coordinated base station is a neighboring cell of the relay station. Preferably, after the relay station receives the cooperative base station selection threshold from the base station, the method further includes: when the relay station is located in the cell of the base station, the relay station determines that the coordinated base station set is a cooperative base station subset. Preferably, after determining the subset of the cooperative base station, the method further includes: the base station acquiring the coordinated base station subset from the relay station, and determining whether the cooperative base station in the coordinated base station subset includes the relay station. Preferably, after determining the subset of the cooperative base station, the method further includes: the base station acquiring the coordinated base station subset from the relay station, and determining the resource used by the relay station according to the coordinated base station subset; the base station transmitting the resource to all the cooperative base stations in the cooperative base station subset . Preferably, after the base station sends the resources to all the cooperative base stations in the subset of the cooperative base stations, the method further includes: the relay station sends the data to the coordinated base stations other than the relay stations in the subset of the cooperative base stations by using the resources. Preferably, the method further includes: if the user terminal for cooperative multiple input multiple output is located in a cell of the base station or the relay station, performing cooperative multiple input multiple output operation using all resources on all neighboring cells of the user terminal; The terminal is located at the cell edge of the base station or the relay station, and then determines a subset for cooperative multiple input and multiple output from all neighboring cells of the user terminal, and performs coordinated multiple input multiple output operation using orthogonal resources in the subset; Within the cell of the base station or the relay station and the cell edge, respectively, it is determined from all neighboring cells of the user terminal located in the cell. a first subset for cooperative multiple input multiple output, and determining a second subset for cooperative multiple input multiple output from all neighboring cells of the user terminal located at the cell edge, and using the first subset and the first The two subsets of orthogonal resources perform cooperative multiple input and multiple output operations. In order to achieve the above object, according to another aspect of the present invention, a relay station is provided. The relay station according to the present invention includes: a receiving module, configured to receive a cooperative base station selection threshold from the base station, where the cooperative base station selects a threshold for indicating a maximum value of the interference signal strength; and a measurement module, configured to be located at a cell edge of the base station at the relay station In the case of the measurement, the determining module is configured to determine, from the set of coordinated base stations, that the interference signal strength is less than the cooperative base station selection threshold, and the coordinated base station is a neighboring cell of the relay station. Preferably, the determining module is further configured to determine, when the relay station is located in a cell of the base station, the coordinated base station set as a cooperative base station subset. Preferably, the foregoing relay station further includes: an acquiring module, configured to acquire, by the base station, a resource used by the relay station according to the subset of the cooperative base station. Preferably, the relay station further includes: a sending module, configured to send, by using the resource acquired by the acquiring module, data to other cooperative base stations other than the relay station in the subset of the cooperative base station. Through the present invention, the dynamic selection of the cooperative base station and the scheme of ensuring orthogonal resources occupied by the coordinated user terminal are adopted, and the problem that the lack of the relay station participates in the Co-MIMO processing method is solved, and the user terminal at the cell edge is caused by Co-MIMO. The problem of severe inter-cell interference, thereby reducing inter-cell interference, improving the peak data rate and throughput of the edge user terminals within the coverage of the base station or the relay station; and achieving that the base station can dynamically select whether the subordinate relay station can participate in the Co- The effect of MIMO operation. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a flowchart of a method for processing cooperative MIMO according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a cooperative multiple input multiple output system according to an embodiment of the present invention; 3 is a flow chart showing the implementation of a cooperative multiple input multiple output system according to an embodiment of the present invention; FIG. 4 is a structural block diagram of a relay station according to an embodiment of the present invention; FIG. 5 is a specific embodiment of a relay station according to an embodiment of the present invention. Structure diagram. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The functional phase refers to the problem that the lack of a relay station to participate in the Co-MIMO processing method in the related art, and the problem that the inter-cell interference and the cell edge throughput and the peak rate are caused by the inter-cell interference when the user terminal at the cell edge is in Co-MIMO. The embodiment of the present invention provides a Co-MIMO processing solution, that is, a scheme for dynamically selecting a cooperative base station and a scheme for ensuring orthogonal resources occupied by the coordinated user terminal, and the processing principles of the scheme are as follows: The cooperative base station selection threshold of the base station, wherein the cooperative base station selection threshold is used to indicate the maximum value of the interference signal strength; in the case that the relay station is located at the cell edge of the base station, the relay station measures the interference signal strength of the neighboring cell, and determines that the interference signal strength is less than The neighboring cell that the cooperative base station selects the threshold is a subset of the cooperative base station. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. Method Embodiments It should be noted that the steps shown in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flowchart, in some In this case, the steps shown or described may be performed in a different order than the ones described herein. According to an embodiment of the present invention, a method for processing Co-MIMO is provided. FIG. 1 is a flowchart of a method for processing Co-MIMO according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following step S102. Go to step S104: Step S102, the relay station receives a cooperative base station selection threshold from the base station, where the cooperative base station selects a threshold for indicating the maximum value of the interference signal strength; Step S104, in the case that the relay station is located at the cell edge of the base station, the relay station measures the interference. The signal strength, and determining, from the set of cooperative base stations, that the interference signal strength is less than the cooperative base station selection threshold is a coordinated base station subset, wherein the cooperative base station is set as all neighboring cells of the relay station. It should be noted that, if the relay station is located in the cell of the base station, the relay station determines that the coordinated base station set is a cooperative base station subset. After step S104, the base station acquires a subset of the cooperative base stations from the relay station, and determines whether the cooperative base station in the subset of the cooperative base stations includes the relay station. In the case where the relay station requires Co-MIMO operation, the base station determines the resources used by the relay station according to the subset of the cooperative base stations, and transmits the resources to all the cooperative base stations in the subset of the cooperative base stations. The relay station transmits data through the resource to other cooperative base stations other than the relay station in the subset of the cooperative base stations. It should be noted that, due to the dual characteristics of the base station and the user terminal of the relay station itself, the Co-MIMO operation process of the user terminal is basically the same as the operation of the relay station. The Co-MIMO operation process of the user terminal will be described in detail below. If the user terminal for Co-MIMO is located in the cell of the base station or the relay station, all resources on all neighboring cells of the user terminal are used for Co-MIMO operation. If the user terminal is located at the cell edge of the base station or the relay station, a subset of the resources for Co-MIMO is determined from all neighboring cells of the user terminal, and the Co-MIMO operation is performed using the orthogonal resources in the subset. If the user terminals are respectively located in the cell of the base station or the relay station and at the cell edge, the first subset for Co-MIMO is determined from all neighboring cells of the user terminal located in the cell, and from the user terminal located at the edge of the cell A second subset for Co-MIMO is determined among all neighboring cells, and Co-MIMO operations are performed using resources orthogonal to the first subset and the second subset. The implementation process of the embodiment of the present invention will be described in detail below with reference to examples. 2 is a schematic diagram of a cooperative multiple input multiple output system according to an embodiment of the present invention. As shown in FIG. 2, the system includes: a cooperative base station, that is, a base station BS1, and two cooperative relay stations.

(Collaborative RS, cylinder called CRS), that is, relay station RS1 and relay station RS2, two cooperative user terminals subordinate to two relay stations, that is, user terminal UT1 and user terminal UT2, and one user terminal subordinate to base station BS1, That is, the user terminal UT3. In the relay network of the system, the data transmission and reception of Co-MIMO is relatively complicated. There is a data link of the relay station RS1 data link directly served by the base station BS1 and the user terminal UT3, and a user terminal of the relay station RS1 and the relay station RS2 direct monthly service. UT1, data link of user terminal UT2, there are relay station RS1, relay station RS2 Cooperative links between, etc. The embodiment of the present invention considers the dual characteristics of the base station and the user terminal of the relay station itself, firstly processes as a cooperative base station, implements Co-MIMO operation of the cooperative relay station with other base stations, relay stations, and user terminals, and also considers the characteristics of the user terminal, It is the object of collaboration. At the same time, the resources occupied by the intra-cell and cell edge user terminals of the cooperative base station and the intra-cell and cell edge user terminals of the cooperative relay station are kept orthogonal, and secondly, when the cooperative relay station and the cooperative user terminal are selected, the base station or the relay station user is When the terminal cooperates to transmit and receive (ie, if both the cooperative relay station and the cooperative user are located in the cell of the base station or the relay station), all the resources on all the base stations in the coordinated base station set can be used for Co-MIMO operation; The relay station covers the area edge user terminal, first determines a subset of the coordinated base station set that can be used for Co-MIMO, and then uses the orthogonal resources in the subset to perform Co-MIMO operation; for the user within the coverage of the base station or the relay station The terminal and the user terminal at the cell edge respectively determine a subset of the base station or the relay station coverage and the coverage area edge user terminal can be used for Co-MIMO, and then perform Co-MIMO operation using orthogonal resources in the subset, if there is no orthogonality Resources, then cancel the Co-MIMO operation. 3 is a flowchart of an implementation of a cooperative multiple input multiple output system according to an embodiment of the present invention. As shown in FIG. 3, the process includes the following steps S301 to S314: Step S301, the base station sets a region division threshold according to a threshold. The area is divided into areas such as an inner layer and a cell edge. In step S301, the base station sets an area division threshold, and divides the area into an inner layer, a cell edge, and the like according to the threshold. The measurement signal used in the area division may be path loss information and channel state information (CSI). The amount that can reflect the position of the relay station. It should be noted that, in step S301, the area division threshold may be selected according to the area division structure, for example, when the base station coverage area is divided into three layers i or inner layer, transition layer, and cell edge, area i or division Two thresholds can be selected. Step S302: The base station divides the resource into a plurality of subsets, each subset corresponding to a different area in the area division, and ensures that resources occupied by neighboring base stations and area edge areas are orthogonal. In step S302, the base station divides the resources into a plurality of subsets, each subset corresponds to a different area in the area division, and ensures that the resources occupied by the edge areas of the neighboring base station cells are orthogonal, in order to improve the frequency utilization rate, According to the measurement results of the relay station, the dynamic selection can be used orthogonally. The resource blocks are used for transmission, but it must be ensured that the relay station can cooperate with all the cooperative base stations in the base station subset to be able to transmit using the same resources. Step S303: The base station sends the area division threshold information to all relay stations to which it belongs. In step S303, the base station sends the area division threshold information to all the relay stations to which it belongs. Considering the base station characteristics of the relay station, the area division threshold and the resource allocation operation in the relay station, two methods can be used: (1) centralized : Full control by the base station to determine the partition threshold and resource allocation for the relay station; (2) Distributed: The relay station receives the area division threshold information, and re-determines the new threshold information according to the coverage range, and then according to the new threshold Information determines the allocation of resources. The centralized advantage is that the operation of feature 3 is reduced, signaling resources are saved, but the performance of the flexible configuration of the relay station is reduced. The advantage of distributed is that the relay station can be flexibly configured according to its own situation, but the number of signaling interactions is increased. Step S304, the relay station receives the area division threshold information, and divides the area into an inner layer, a cell edge, and the like according to the threshold. Step S305, the relay station measures channel information and feeds back to the currently serving base station. Due to the dual characteristics of the relay station's own base station and the user terminal, step S304, the steps

The corresponding area division and resource allocation operation of the relay station in S307 is exactly the same as the operations of step S301 and step S302. Step S306, the base station determines, according to the channel information that is fed back, the area where the relay station is located, and allocates resources occupied by the corresponding area. Step S307, the relay station divides the resource into a plurality of subsets, each subset corresponding to a different area in the area division, and ensures that resources occupied by the adjacent relay station or the base station cell edge area are orthogonal. It should be noted that steps S308 to S314 are detailed descriptions of the above steps S102 to S104. Step S308, the base station sets the cooperative base station selection threshold and sends the threshold to the relay station. In step S308, the base station sets the cooperative base station selection threshold and sends the coordinated base station selection threshold to the relay station. The threshold is actually an interference signal comparison threshold. The interference signal strength below the threshold is the upper limit of the interference that the system can tolerate. The threshold value is considered to be that the relay station must perform inter-cell interference coordination processing on the interference signal. Step S309, the relay station measures the signal strength of the dry 4 especially. Step S310, comparing the measured interference signal strength with the cooperative base station selection threshold to determine a coordinated base station subset of the relay station. In step S310, the measured interference signal strength is compared with the cooperative base station selection threshold to determine a coordinated base station subset of the relay station, and for the intra-cell relay station, all neighboring cells are directly selected as the cooperation according to the channel state information fed back by the relay station. The base station set, for the cell edge relay station to filter the cooperative base station subset according to the cooperative base station selection threshold (that is, when the relay station is located at the cell edge of the base station, the relay station measures the interference signal strength of the neighboring cell, and determines that the interference signal strength is smaller than the cooperative base station. The neighboring cell selecting the threshold is a subset of the cooperative base station). Step S311: The base station determines whether the relay station is selected as the cooperative base station subset. Step S312, the base station determines the used resource according to the subset of the cooperative base station for the relay station that needs the Co-MIMO operation. Step S313, the base station feeds back the resources occupied by the relay station to all the cooperative base stations in the subset of the cooperative base stations. Step S314, the relay station occupies the resources determined by the base station to simultaneously transmit data to all the cooperative base stations in the cooperative base station subset. It should be noted that, when the cooperative user terminal is selected, when all the intra-cell user terminals are cooperatively transmitting and receiving (that is, if the user terminals for cooperation are located in the cell of the base station or the relay station), the cooperative base station set may be used. All resources on all base stations in the base perform Co-MIMO operation; for all cell edge user terminals, first determine a subset of the coordinated base station set that can be used for Co-MIMO, and then use orthogonal resources in the subset Co-MIMO operation; For user terminals that have both intra-cell and cell edge, respectively determine a subset of intra-cell and cell-edge user terminals available for Co-MIMO. Due to the dual characteristics of the base station and the user terminal of the relay station itself, the Co-MIMO operation process of the user terminal is basically the same as that of the relay station due to the jib. Apparatus Embodiment According to an embodiment of the present invention, a relay station is provided. 4 is a structural block diagram of a relay station according to an embodiment of the present invention. As shown in FIG. 4, the relay station includes: a receiving module 42, a measuring module 44, and a determining module 46. The structure will be described in detail below. The receiving module 42 is configured to receive a cooperative base station selection threshold from the base station, where the cooperative base station selects a threshold for indicating a maximum value of the interference signal strength, and the measurement module 44 is configured to: when the relay station is located at a cell edge of the base station, The interference signal strength of the neighboring cell; the determining module 46 is connected to the receiving module 42 and the measuring module 44, and is configured to determine, from the set of cooperative base stations, that the cell with the interference signal strength less than the cooperative base station selection threshold is a subset of the cooperative base station, where the cooperative base station The collection is all neighboring cells of the relay station. The determining module 46 is further configured to determine that the coordinated base station set is a cooperative base station subset if the relay station is located in a cell of the base station. FIG. 5 is a structural block diagram of a relay station according to an embodiment of the present invention. As shown in FIG. 5, the relay station further includes: an obtaining module 52 and a sending module 54, which are described in detail below. The obtaining module 52 is configured to acquire, by the base station, the resources used by the relay station according to the subset of the cooperative base stations. The sending module 54 is connected to the obtaining module 52, and is configured to send data to the ten base stations other than the relay station in the subset of the cooperative base station by using resources. It should be noted that, before the acquiring module 52 acquires the base station to determine the resource used by the relay station according to the subset of the cooperative base station, the base station determines the resource used by the relay station according to the subset of the cooperative base station, and sends the resource to all the cooperative base stations in the subset of the cooperative base station. . The above embodiments of the present invention pass the dynamic selection of the set of cooperative base stations in the network coverage area, and improve the sector throughput while inheriting Co-MIMO to mitigate inter-cell interference or become an effective signal, and perform base station in Co-MIMO. Dynamic selection and orthogonalization of resource usage by user terminals further eliminates inter-cell interference and effectively improves peak data rate, average cell throughput, and especially peak data rate of edge user terminals within coverage of base stations or relay stations. And throughput. In addition, the base station can dynamically select whether the subordinate relay station can participate in the Co-MIMO operation, and the use is more flexible. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device for execution by the computing device, or They are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A processing method for cooperative multiple input and multiple output, comprising:

The relay station receives a cooperative base station selection threshold from the base station, where the cooperative base station selection threshold is used to indicate a maximum value of the interference signal strength;

In a case where the relay station is located at a cell edge of the base station, the relay station measures the interference signal strength, and determines, from the coordinated base station set, that the cell whose interference signal strength is smaller than the cooperative base station selection threshold is a cooperative base station. The set, where the coordinated base station set is all neighboring cells of the relay station.

The method according to claim 1, wherein after the relay station receives the cooperative base station selection threshold from the base station, the method further includes:

Where the relay station is located within a cell of the base station, the relay station determines that the set of coordinated base stations is the subset of cooperative base stations.

The method according to claim 2, wherein after determining the subset of the cooperative base stations, the method further includes:

The base station acquires the coordinated base station subset from the relay station and determines whether the cooperative base station in the coordinated base station subset includes the relay station.

4. The method according to claim 2, wherein after determining the subset of the cooperative base stations, the method further comprises:

The base station acquires the subset of the cooperative base stations from the relay station, and determines resources used by the relay station according to the subset of the cooperative base stations;

The base station transmits the resources to all cooperative base stations in the subset of the cooperative base stations.

The method according to claim 4, after the base station sends the resource to all the cooperative base stations in the subset of the cooperative base station, the method further includes:

The relay station transmits data through the resource to other cooperative base stations other than the relay station in the subset of the cooperative base stations.

The method according to any one of claims 1 to 5, further comprising: if a user terminal for cooperative multiple input multiple output is located in a cell of the base station or the relay station, All resources on all neighboring cells of the user terminal perform cooperative multiple input multiple output operation; if the user terminal is located at a cell edge of the base station or the relay station, determining from all neighboring cells of the user terminal A subset for collaborative multiple input and multiple output, and cooperative multi-input and multi-output operations using orthogonal resources in the subset;

If the user terminal is located in the cell of the base station or the relay station and the cell edge, respectively, determining, for the coordinated multiple input and multiple output, from all neighboring cells of the user terminal located in the cell a subset, and determining, from all neighboring cells of the user terminal located at the edge of the cell, a second subset for cooperative multiple input multiple output, and using the first subset and the second Collaborative multiple input and multiple output operations are performed on orthogonal resources in the subset.

A relay station, comprising:

a receiving module, configured to receive a cooperative base station selection threshold from the base station, where the cooperative base station selection threshold is used to indicate a maximum value of the interference signal strength;

a measuring module, configured to measure the interference signal strength if the relay station is located at a cell edge of the base station;

And a determining module, configured to determine, from the set of coordinated base stations, that the cell with the interference signal strength less than the cooperative base station selection threshold is a subset of the cooperative base station, where the coordinated base station set is all neighboring cells of the relay station.

8. The relay station according to claim 7, wherein

The determining module is further configured to determine, when the relay station is located in a cell of the base station, the coordinated base station set as the cooperative base station subset.

The relay station according to claim 7 or 8, further comprising:

And an obtaining module, configured to acquire, by the base station, a resource used by the relay station according to the subset of the cooperative base station. The relay station according to claim 9, further comprising:

And a sending module, configured to send, by using the resource acquired by the acquiring module, data to other cooperative base stations other than the relay station in the subset of the cooperative base stations.