WO2010105549A1 - 多输入多输出系统中用于多小区协作通信的方法及装置 - Google Patents

多输入多输出系统中用于多小区协作通信的方法及装置 Download PDF

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Publication number
WO2010105549A1
WO2010105549A1 PCT/CN2010/071064 CN2010071064W WO2010105549A1 WO 2010105549 A1 WO2010105549 A1 WO 2010105549A1 CN 2010071064 W CN2010071064 W CN 2010071064W WO 2010105549 A1 WO2010105549 A1 WO 2010105549A1
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Prior art keywords
base station
mobile terminal
cell
determined
control information
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PCT/CN2010/071064
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English (en)
French (fr)
Inventor
孙芳蕾
尤明礼
刘瑾
赵岩
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阿尔卡特朗讯
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Application filed by 阿尔卡特朗讯 filed Critical 阿尔卡特朗讯
Priority to KR1020117024061A priority Critical patent/KR101280854B1/ko
Priority to US13/257,215 priority patent/US8811316B2/en
Priority to BRPI1009545A priority patent/BRPI1009545A2/pt
Priority to EP10753116.2A priority patent/EP2410664A4/en
Priority to JP2012500048A priority patent/JP5297557B2/ja
Publication of WO2010105549A1 publication Critical patent/WO2010105549A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting

Definitions

  • the present invention relates to a multiple input multiple output technique, and more particularly to a technique in which multiple base stations cooperate to perform multiple input multiple output transmission. Background technique
  • existing wireless communication networks In order to increase the system user capacity, existing wireless communication networks often adopt low frequency reuse factors, that is, all cells share the same time-frequency resources, and inter-cell interference caused by low-frequency reuse factors restricts downlink capacity. An important factor. For a mobile terminal located at the edge of a cell (ie, an area between adjacent cells), while receiving a useful signal from the base station to which it belongs, it also receives signals from other base stations using the same time-frequency resource. The signals of other base stations constitute interference to the mobile terminal.
  • the applicant of the present invention proposes a multi-cell multiple input multiple output.
  • Multi-cell MIMO is a family of technologies that has been proposed as an alternative to the Long Term Evolution (LTE) project and IEEE 802.16m.
  • LTE Long Term Evolution
  • Multi-cell MIMO technology mobile terminals in a cooperative area will be able to obtain services from multiple base stations.
  • multi-cell MIMO technology transforms inter-cell interference into useful signals, thereby breaking the limitation of spectrum efficiency of conventional cellular systems.
  • the multi-cell MIMO technology solution includes a centralized multi-cell MIMO scheme, such as a network MIMO scheme, which is computationally complex.
  • the multi-cell MIMO technology solution also includes a distributed multi-cell MIMO scheme, such as a cooperative MIMO scheme.
  • a distributed multi-cell MIMO scheme such as a cooperative MIMO scheme.
  • multi-cell scheduling how to better define the cooperation strategy between adjacent cells is still a big challenge, which will directly affect the distributed multi-cell.
  • the present invention proposes a method and apparatus for communication in a MIMO system.
  • FIG. 1 shows a schematic diagram of a MIMO system in accordance with one embodiment of the present invention.
  • base stations 1 and 2 are located in two adjacent cells, respectively, to provide cooperative MIMO transmission for mobile terminals 21 and 22.
  • Figure 2 shows an equivalent channel model in the foreseeable embodiment.
  • S1 represents a data stream transmitted by the base station 1 to the mobile terminal
  • S2 represents a data stream transmitted by the base station 2 to the mobile terminal 22, and represents a precoding vector or matrix of the data stream Si on the base station j
  • a channel state matrix between 2i and base station j A channel state matrix between 2i and base station j.
  • the equivalent channel considering the precoding between the data streams S1, S2 and the mobile terminals 21, 22 can be expressed as follows z 21 / u + h u t n It can be seen from the above equation that the equivalent channels between the two data streams and the two mobile terminals are closely related to the inter-cell channel and precoding components.
  • the complete channel state information and data information need to be exchanged between the cooperative base stations, which brings a large amount of backhaul transmission overhead, and also makes the calculation complexity of the precoding optimization high.
  • an important purpose is to reduce the amount of information exchanged between cooperative base stations. For example, in the above embodiment, only the base station 2 transmits the pre-coded data stream S2, i.e., t 12 S2, to the base station 1, and the base station 1 does not need to transmit the data stream S 1 to the base station 2.
  • a method for communication in a multiple input multiple output communication system comprising the steps of: determining that multi-cell multiple input multiple output cooperation is performed by at least one first base station and one second base station; Obtaining, by the second base station, the determined downlink transmission control information of the first base station, where the determined downlink transmission control information includes indication information of the at least one determined mobile terminal in the cell where the first base station is located; The downlink transmission control information of the first base station selects a coordinated mobile terminal; the downlink data and the downlink transmission control information of the selected coordinated mobile terminal are sent by the second base station to the first base station; Downlink data and downlink of the mobile terminal Transmitting control information, adjusting downlink data transmission of the at least one determined mobile terminal by the first base station.
  • a method for communicating in a base station of a multiple input multiple output communication system comprising the steps of: A. obtaining determined downlink transmission control information of at least one determined cell, Determining that downlink transmission control information includes indication information of at least one determined mobile terminal in each of the at least one determined cell; B. according to downlink transmission control information of the at least one determined cell, where the base station belongs Selecting a cooperative mobile terminal in the cell; C. transmitting downlink data and downlink transmission control information of the selected coordinated mobile terminal to the base station of the at least one determined cell.
  • a method for communicating in a base station of a multiple input multiple output communication system comprising the steps of: a. transmitting determined downlink transmission control information in a cell in which the base station is located At least another base station, the determined downlink transmission control information includes indication information of at least one determined mobile terminal in a cell in which the base station is located; b. acquiring downlink of the selected coordinated mobile terminal from the at least another base station Data and downlink transmission control information; c. adjusting downlink data transmission of the at least one determined mobile terminal by the base station according to downlink data of the coordinated mobile terminal and downlink transmission control information.
  • a first communication apparatus for communication in a base station of a multiple input multiple output communication system, comprising: first obtaining means, configured to acquire a determined downlink of at least one determined cell Transmitting control information, the determined downlink transmission control information includes indication information of a base station and at least a predetermined mobile terminal in each of the at least one determined cell; and first determining means, configured to determine, according to the at least one The downlink transmission control information of the cell, the coordinated mobile terminal is selected in the cell to which the base station belongs; the first sending device is configured to send downlink data and downlink transmission control information of the selected coordinated mobile terminal to the at least one determined cell Base station.
  • a second communication apparatus for communication in a base station of a multiple input multiple output communication system, comprising: a second transmitting apparatus, said base station The determined downlink transmission control information in the cell to which the cell belongs is sent to at least another base station, where the determined downlink transmission control information includes indication information of the at least one mobile terminal in the cell in which the base station is located; Downlink data and downlink transmission control information of the selected coordinated mobile terminal from the at least another base station; first adjusting means, adjusting the base station to the base station according to downlink data and downlink transmission control information of the coordinated mobile terminal At least one downlink data transmission of the determined mobile terminal.
  • a wireless communication network using multi-base station MIMO technology will have the following features: When multi-base station cooperative MIMO transmission, the amount of information exchanged between base stations is greatly reduced; and effective inter-cell interference is realized. Suppression; Since one or more base stations can serve multiple users on the same time-frequency resource and suppress interference between users, the throughput of the system is improved. DRAWINGS
  • FIG. 1 is a schematic diagram of a MIMO system in accordance with an embodiment of the present invention
  • FIG. 2 is an equivalent channel model in accordance with an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a MIMO system in accordance with one embodiment of the present invention.
  • FIG. 4 is a flow chart of a method for communicating in a multiple input multiple output communication system in accordance with one embodiment of the present invention.
  • Figure 5 is a flow chart showing a method for communicating in a base station of a multiple input multiple output communication system in accordance with one embodiment of the present invention
  • FIG. 6 is a flow chart showing a method for communication in a base station of a multiple input multiple output communication system according to an embodiment of the present invention
  • Figure 7 is a block diagram showing a first communication device for communication in a base station of a multiple input multiple output communication system in accordance with one embodiment of the present invention
  • FIG. 8 is a block diagram showing a second communication device for communication in a base station of a multiple input multiple output communication system in accordance with one embodiment of the present invention
  • FIG. 9 is a diagram showing a cell topology of a distributed multiple input multiple output communication system according to an embodiment of the present invention
  • FIG. 3 shows a schematic diagram of a MIMO system in accordance with one embodiment of the present invention.
  • base stations 1, 2, and 3 are located in three adjacent cells, respectively, to provide cooperative MIMO transmission for mobile terminals 21, 22, and 23.
  • FIG. 4 is a flow chart of a method for communicating in a multiple input multiple output communication system in accordance with one embodiment of the present invention. The invention will now be described from a system perspective with reference to Figures 1, 2 and 4.
  • step 401 the system will determine that multi-cell MIMO cooperation is performed by at least one first base station and one second base station.
  • the base station 1 provides MIMO transmission for the mobile terminal 21, and when the mobile terminal 21 moves to the signal overlapping area of the base stations 1, 2, that is, the cooperation area of the base stations 1, 2, the system determines that the base station 1, 2 performs multi-cell MIMO collaboration.
  • the base station 1 corresponds to the first base station, and the base station 2 corresponds to the second base station.
  • step 402 the determined downlink transmission control information of the first base station is obtained by the second base station, where the determined downlink transmission control information includes indication information of at least one determined mobile terminal in the cell where the first base station is located.
  • the base station 1 maintains the precoding t u when transmitting data to the mobile terminal 21, and the base station 2 acquires the indication information of the mobile terminal 21, thereby knowing that the mobile terminal 21 will participate in multi-cell cooperation.
  • the determined downlink transmission control information may further include channel information and downlink precoding between the determined base station and the determined mobile terminal. One or more of the information.
  • the second base station selects the cooperative mobile terminal according to the downlink transmission control information of the first base station. Specifically, the base station 2 selects the mobile terminal 22 from the cell in which the base station 2 is located as a cooperative mobile terminal based on the indication information with the mobile terminal 21.
  • step 404 the downlink data and the downlink transmission control information of the selected coordinated mobile terminal are sent by the second base station to the first base station.
  • the base station 2 transmits the pre-coded data stream S2 transmitted to the mobile terminal 22 and the indication information of the mobile terminal 22 to the base station L.
  • the downlink transmission control information of the coordinated mobile terminal may further include one of channel information and downlink precoding information related to the coordinated mobile terminal.
  • the downlink data of the cooperative mobile terminal may be original data, or may be pre-coded data.
  • the first base station adjusts downlink data transmission of the at least one determined mobile terminal by the first base station according to the downlink data of the coordinated mobile terminal and the downlink transmission control information.
  • the base station 1 adjusts the transmission of the data stream S1 according to the received data stream S2' and the indication information of the mobile terminal 22 to implement interference cancellation on the data stream S2.
  • the precoding of the mobile terminal 21 by the base station 1 is kept unchanged.
  • the basic method of the present invention is to schedule the base stations participating in multi-cell MIMO cooperation one by one.
  • the first base station first selects the mobile terminal participating in the collaboration and performs transmission settings, including precoding settings. Then, the scheduling and setting results of the first base station are kept unchanged, and the second base station selects the mobile terminal participating in the cooperation according to the scheduling and setting result of the first base station and performs transmission setting, including joint precoding setting. If the third base station participates in the multi-cell MIMO cooperation, the scheduling and setting results of the first base station and the second base station are kept unchanged, and the third base station selects according to the scheduling and setting of the first base station and the second base station. Participate in collaborative mobile terminals and make transmission settings, including joint precoding settings. If there are other base stations involved in multi-cell MIMO collaboration, and so on.
  • step 501 the latest one that joins the multi-cell ⁇ cooperation will acquire the determined downlink transmission control information of the at least one determined cell, where the determined downlink transmission control information includes each cell in the at least one determined cell. At least one indication information of the determined mobile terminal.
  • the base station 1 has completed user scheduling and transmission settings including precoding settings, wherein the mobile terminal 21 involves multi-cell ⁇ cooperation, then the base station 1
  • the cell is referred to as a determined cell, and the mobile terminal 21 is referred to as a determined mobile terminal.
  • the base station 2 will acquire the indication information of the mobile terminal 21, thereby knowing that the mobile terminal 21 will participate in multi-cell cooperation.
  • multi-cell ⁇ cooperation is performed between the base stations 1, 2, and 3.
  • the base station 1 and the base station 2 have completed user scheduling and transmission settings including precoding settings, where the mobile terminal 21 and the mobile terminal 22 are involved.
  • the cells in which the base station 1 and the base station 2 are located are referred to as determined cells, and the mobile terminals 21, 22 are referred to as determined mobile terminals.
  • the base station 3 will obtain the indication information of the mobile terminals 21, 22, so that it is known that the mobile terminals 21, 22 will participate in multi-cell cooperation.
  • the determined downlink transmission control information may further include channel information and downlink precoding between the determined base station and the determined mobile terminal. One or more of the information.
  • the base station newly joining the multi-cell coordination will select the cooperative mobile terminal in the cell to which the base station belongs according to the downlink transmission control information of the at least one determined cell.
  • multi-cell ⁇ cooperation is performed between the base station 1 and the base station 2, and the base station 2 is a base station newly joined by the multi-cell ,, and the base station 2 is located in the cell where the base station 2 is located according to the downlink transmission control information of the cell where the base station 1 is located.
  • the selection is made in the mobile terminal, and the mobile terminal 22 is determined as the cooperative mobile terminal.
  • multi-cell ⁇ cooperation is performed between the base stations 1, 2, and 3, and the base station 3 is a new base station that joins the multi-cell ⁇ cooperation, and the base station 3 is at the base station 3 according to the downlink transmission control information of the cell in which the base station 1 and the base station 2 are located.
  • the mobile terminal in the cell is selected and the mobile terminal 23 is determined as the cooperative mobile terminal.
  • the base station newly joining the multi-cell MIMO cooperation transmits the downlink data of the selected coordinated mobile terminal and the downlink transmission control information to the base station of the at least one determined cell.
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 2, and the base station 2 is a base station newly joining the multi-cell MIMO cooperation, and the determined cooperative mobile terminal is the mobile terminal 22, and the base station 2 transmits the mobile terminal 22 to the mobile terminal 22.
  • the pre-coded data and the downlink transmission control information of the mobile terminal 22 are transmitted to the base station 1.
  • multi-cell MIMO cooperation is performed between the base stations 1, 2, and 3, and the base station 3 is a base station newly joining the multi-cell MIMO cooperation.
  • the determined cooperative mobile terminal is the mobile terminal 23, and the base station 3 transmits the mobile terminal 23 to the mobile terminal 23.
  • the pre-coded data and the downlink transmission control information of the mobile terminal 23 are transmitted to the base station 1 and the base station 2.
  • the downlink transmission control information of the coordinated mobile terminal may further include one of channel information and downlink precoding information related to the coordinated mobile terminal.
  • the downlink data of the cooperative mobile terminal may be original data, or may be pre-coded data.
  • a base station of the determined cell that joins the multi-cell MIMO cooperation sends the determined downlink transmission control information in the cell to a base station that newly joins the multi-cell MIMO cooperation, and the determined downlink transmission control information includes the The indication information of the at least one determined mobile terminal in the cell has been determined.
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 2, where the cell in which the base station 1 is located is a determined cell, the mobile terminal 21 is a determined mobile terminal, and the base station 2 needs to determine that the cell in which it is located participates in multi-cell MIMO cooperation. Mobile terminal and its transmission settings. Then, the base station 1 transmits the indication information of the mobile terminal 21 to the base station 2.
  • multi-cell MIMO cooperation is performed between the base stations 1, 2, and 3.
  • the cell in which the base station 1 and the base station 2 are located is a determined cell
  • the mobile terminals 21 and 22 are determined mobile terminals
  • the base station 3 needs to determine the cell in which it is located.
  • the base stations 1 and 2 respectively transmit the indication information of the mobile terminals 21 and 22 to the base station 3.
  • the downlink transmission control information may further include one or more of channel information and downlink precoding information between the determined base station and the determined mobile terminal.
  • step 602 the base station of the determined cell will acquire downlink data and downlink transmission control information from the selected coordinated mobile terminal of the base station newly joining the multi-cell MIMO cooperation.
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 2, and the cell in which the base station 1 is located is a determined cell. Then, the base station 1 will acquire downlink data and downlink transmission control information of the selected coordinated mobile terminal from the base station 2.
  • multi-cell MIMO cooperation is performed between the base stations 1, 2, and 3.
  • the cell in which the base station 1 and the base station 2 are located is a determined cell.
  • the base stations 1 and 2 respectively acquire downlink data and downlink transmission control information of the selected coordinated mobile terminal from the base station 3.
  • the downlink transmission control information of the coordinated mobile terminal may further include one of channel information and downlink precoding information related to the coordinated mobile terminal.
  • the downlink data of the cooperative mobile terminal may be original data, or may be pre-coded data.
  • step 603 the base station that has determined that the cell will adjust the downlink data transmission of the determined base station to the at least one determined mobile terminal according to the downlink data of the coordinated mobile terminal and the downlink transmission control information.
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 2, the cell in which the base station 1 is located is a determined cell, and the mobile terminal 21 is a determined mobile terminal. Then, the base station 1 adjusts the downlink data transmission to the mobile terminal 21 according to the downlink data and the downlink transmission control information of the coordinated mobile terminal determined by the base station 2 to perform interference cancellation. When the data transmission is adjusted, the precoding of the mobile terminal 21 by the base station 1 is kept unchanged.
  • multi-cell cooperation is performed between the base stations 1, 2, and 3.
  • the cell in which the base station 1 and the base station 2 are located is a determined cell, and the mobile terminals 21 and 22 are determined mobile terminals.
  • the base stations 1 and 2 respectively adjust the downlink data transmission to the mobile terminals 21 and 22 according to the downlink data and the downlink transmission control information of the coordinated mobile terminal determined by the base station 3 to perform interference cancellation.
  • the precoding of the mobile terminal 21 by the base station 1 and the precoding of the mobile terminal 11 by the base station 2 are respectively maintained. Similar specific operations can be employed in the foregoing steps 403 and 502.
  • the selection process of the cooperative mobile terminal by the base station joining the multi-cell MIMO cooperation will be described in more detail below.
  • the cell in which the base station 1 is located is the determined cell
  • the mobile terminal 21 is the terminal that has been determined.
  • the specific steps of the base station 2 to select a cooperative mobile terminal are as follows.
  • base station 2 determines optimal precoding for at least one mobile terminal within its cell.
  • the downlink precoding matrix between the base station 1 and the mobile terminal 21 is ⁇ .
  • the joint downlink precoding matrix between the base station 1, the base station 2 and the mobile terminal 21, and any mobile terminal in the cell in which the base station 2 is located may be expressed as
  • the joint precoding matrix ⁇ 2 is a block upper triangular matrix. Since the transmission setting of the cell in which the base station 1 is located is to be maintained, the equivalent channel between the two base stations and the two mobile terminals can be expressed as
  • the base station 2 determines the optimal precoding for each of the at least one mobile terminal within its cell in accordance with the first predetermined rule.
  • the first predetermined rule is a decision criterion based on a signal to interference ratio.
  • the interference power of the kth user is defined as: the total power of interference received by the kth user caused by other users, which can be expressed as Where t k is the precoding vector of M x 1 of the kth user, and the MIMO channel of the kth user is a matrix of ⁇ ⁇ . Because the signal to jamming and noise ratio (SJNR) of different users are independent of each other, precoding of different users can be designed separately. Based on the maximum signal
  • the optimal precoding for the kth user corresponds to The eigenvector of the largest eigenvalue of the matrix pair H k and H k + N 0 /P k I .
  • the result of the optimal precoding can be expressed as the eigenvector corresponding to the largest eigenvalue represented therein, which is the transmitter power of the kth user, and 0 ! ⁇ + ⁇ 1 -, .
  • the base station 2 is a certain mobile terminal.
  • the first predetermined rule is a decision criterion based on block diagonalization.
  • the precoding of the kth user is the product of two matrices:
  • the optimal precoding matrix determined by the base station 2 for a certain mobile terminal is. 2 (
  • the first predetermined rule is based on a maximum signal to noise ratio Judging criteria.
  • the base station 2 selects the cooperative mobile terminal from at least one mobile terminal that has determined the optimal precoding according to the second predetermined rule.
  • the second predetermined rule is to cause the system to satisfy the maximum throughput.
  • the second predetermined rule is to satisfy fairness between the mobile terminals.
  • the determined cooperative mobile terminal is the mobile terminal 22.
  • the base station 1 Taking the three-cell MIMO cooperation between the base station 1, the base station 2, and the base station 3 as an example, the base station
  • the cell in which the base station 2 is located is a determined cell, and the mobile terminals 21, 22 are already determined terminals.
  • the specific steps of the base station 3 to select a cooperative mobile terminal are as follows.
  • base station 3 determines the optimal precoding for at least one mobile terminal within its cell. Joint downlink precoding moment between base station 1, base station 2, base station 3 and mobile terminals 21, 22 and any mobile terminal in the cell in which base station 3 is located
  • the base station 3 determines the optimal precoding for each of the at least one mobile terminal within its cell in accordance with the first predetermined rule.
  • the first predetermined rule is based on a signal to interference ratio Break criterion.
  • the base station 3 determines the optimal precoding for a mobile terminal based on the maximum signal to interference ratio criterion.
  • the first predetermined rule is a criterion based on block diagonalization.
  • the null space of the channel space of the mobile terminals 21, 22, namely: disturb v Q ⁇ k , where is the right ⁇ matrix of the singular value decomposition of H; 3 (.). That is, joint downlink precoding
  • the matrix T 3 satisfies block diagonalization.
  • the first predetermined rule is a criterion based on a maximum signal to noise ratio.
  • the base station 3 selects the cooperative mobile terminal from at least one of the mobile terminals that have determined the optimal precoding according to the second predetermined rule.
  • the second predetermined rule is to cause the system to satisfy the maximum throughput.
  • the second predetermined rule is to satisfy fairness between the mobile terminals.
  • the determined cooperative mobile terminal is the mobile terminal 23.
  • only one mobile terminal and one data stream in the cell in which each base station is located participate in multi-cell MIMO cooperation. It should be understood by those skilled in the art that the present invention is not limited thereto, and a cell in which each base station is located may have multiple mobile terminals and multiple data streams participate in multi-cell MIMO cooperation.
  • Figure 7 is a block diagram of a first communication device for communication in a base station of a multiple input multiple output communication system in accordance with one embodiment of the present invention.
  • the first communication device 70 includes a first acquisition device 71, a first determination device 72, and a first transmission device 73.
  • the first communication device 70 is disposed in a base station in a MIMO system.
  • Figure 8 is a block diagram of a second communication device for communication in a base station of a multiple input multiple output communication system, in accordance with one embodiment of the present invention.
  • the second communication device 80 includes a The second transmitting device 81, the second obtaining device 82, and the first adjusting device 83.
  • the second communication device 80 is disposed in a base station of the MIMO system.
  • the present invention will be described from the viewpoint of a device in conjunction with Figs. 1, 2, 3, 7, and 8.
  • the determined downlink transmission control information of the at least one determined cell will be acquired by the first obtaining means 71 in the first communication device 70, the determined downlink transmission control
  • the information includes indication information of at least one determined mobile terminal within each of the at least one determined cell.
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 2, and the base station 1 has completed user scheduling and transmission settings including precoding settings, wherein the mobile terminal 21 involves multi-cell MIMO cooperation, and the base station 1
  • the cell is referred to as a determined cell
  • the mobile terminal 21 is referred to as a determined mobile terminal.
  • the first obtaining means 71 in the base station 2 will obtain the indication information of the mobile terminal 21, thereby knowing that the mobile terminal 21 will participate in multi-cell cooperation.
  • multi-cell MIMO cooperation is performed between the base stations 1, 2, and 3.
  • the base station 1 and the base station 2 have completed user scheduling and transmission settings including precoding settings, where the mobile terminal 21 and the mobile terminal 22 are involved.
  • the cells in which the base station 1 and the base station 2 are located are referred to as determined cells, and the mobile terminals 21, 22 are referred to as determined mobile terminals.
  • the first obtaining means 71 in the base station 3 will acquire the indication information of the mobile terminals 21, 22, thereby knowing that the mobile terminals 21, 22 will participate in the multi-cell cooperation.
  • the determined downlink transmission control information may further include channel information and downlink precoding between the determined base station and the determined mobile terminal. One or more of the information.
  • the base station newly joining the multi-cell MIMO cooperation will select the cooperative mobile terminal in the cell to which the base station belongs based on the downlink transmission control information of the at least one determined cell by the first determining means 72 in the first communication device 70.
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 1, and the base station 2 is a base station newly joining the multi-cell MIMO cooperation, and the first determining device 72 in the base station 2 is based on the downlink transmission control information of the cell in which the base station 1 is located.
  • the mobile terminal in the cell in which the base station 2 is located performs selection, and the mobile terminal 22 is determined as the cooperative mobile terminal.
  • multi-cell MIMO cooperation is performed between the base stations 1, 2, and 3, and the base station 3 Is a new base station that joins multi-cell MIMO cooperation, and the first determining device 72 in the base station 3 selects in the mobile terminal in the cell where the base station 3 is located according to the downlink transmission control information of the cell in which the base station 1 and the base station 2 are located, and The mobile terminal 23 determines to be a cooperative mobile terminal.
  • the base station newly joining the multi-cell MIMO cooperation will transmit the downlink data of the selected coordinated mobile terminal and the downlink transmission control information to the base station of the at least one determined cell by the first transmitting device 73 in its first communication device 70. .
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 2, and the base station 2 is a base station newly joining the multi-cell MIMO cooperation, and the determined cooperative mobile terminal is the mobile terminal 22, and the first transmitting device 73 in the base station 2 will
  • the precoded data transmitted to the mobile terminal 22 and the downlink transmission control information of the mobile terminal 22 are transmitted to the base station 1.
  • a multi-cell MIMO operation is performed between the base stations 1, 2, and 3, and the base station 3 is a base station newly joining the multi-cell MIMO cooperation, and the determined cooperative mobile terminal is the mobile terminal 23, and the first of the base stations 3
  • the transmitting device 73 transmits the precoded data transmitted to the mobile terminal 23 and the downlink transmission control information of the mobile terminal 23 to the base station 1 and the base station 2.
  • the downlink transmission control information of the coordinated mobile terminal may further include one of channel information and downlink precoding information related to the coordinated mobile terminal.
  • the downlink data of the cooperative mobile terminal may be original data, or may be pre-coded data.
  • the ⁇ base station will transmit the determined downlink transmission control information in the cell to a new join by the second transmitting device 81 in its second communication device 80.
  • the multi-cell MIMO cooperative base station the determined downlink transmission control information includes indication information of at least one determined mobile terminal in the determined cell.
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 2, where the cell in which the base station 1 is located is a determined cell, the mobile terminal 21 is a determined mobile terminal, and the base station 2 needs to determine that the cell in which it is located participates in multi-cell MIMO cooperation. Mobile terminal and its transmission settings. Then, the second transmitting device 81 in the base station 1 transmits the indication information of the mobile terminal 21 to the base station 2.
  • multi-cell MIMO cooperation is performed between the base stations 1, 2, and 3. The cell in which the base station 1 and the base station 2 are located is a determined cell, the mobile terminals 21 and 22 are determined mobile terminals, and the base station 3 needs to determine the cell in which it is located. Mobile terminals participating in multi-cell MIMO cooperation and their transmission settings. Then, the base stations 1 and 2 respectively transmit the indication information of the mobile terminals 21 and 22 to the base station 3 by the respective second transmitting apparatuses 81.
  • the determined downlink transmission control information may further include channel information and downlink precoding between the determined base station and the determined mobile terminal. One or more of the information.
  • the base station of the determined cell will acquire the downlink data from the selected coordinated mobile terminal of the base station newly joined to the multi-cell MIMO cooperation by the second acquisition means 82 in its second communication device 80 as 'and downlink transmission control information.
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 2, and the cell in which the base station 1 is located is a determined cell. Then, the base station 1 will acquire downlink data and downlink transmission control information from the selected coordinated mobile terminal of the base station 2 by its second obtaining means 82.
  • multi-cell MIMO cooperation is performed between the base stations 1, 2, and 3.
  • the cell in which the base station 1 and the base station 2 are located is a determined cell.
  • the base stations 1, 2 acquire the downlink data and the downlink transmission control information of the selected coordinated mobile terminal from the base station 3 by the respective second obtaining means 82, respectively.
  • the downlink transmission control information of the coordinated mobile terminal may further include one of channel information and downlink precoding information related to the coordinated mobile terminal.
  • the downlink data of the cooperative mobile terminal may be original data, or may be pre-coded data.
  • the base station of the determined cell will adjust, by the first adjusting device 83 of the second communication device 80, the determined base station to the at least one determined mobile according to the downlink data of the coordinated mobile terminal and the downlink transmission control information. Downlink data transmission of the terminal.
  • multi-cell MIMO cooperation is performed between the base station 1 and the base station 2, where the cell in which the base station 1 is located is a determined cell, and the mobile terminal 21 is a determined mobile terminal. Then, the base station 1 is determined by its first adjusting device 83 according to the downlink data of the coordinated mobile terminal determined by the base station 2. And downlink transmission control information, adjusting downlink data transmission to the mobile terminal 21 for interference cancellation. When the data transmission is adjusted, the precoding of the mobile terminal 21 by the base station 1 is kept unchanged.
  • multi-cell MIMO cooperation is performed between the base stations 1, 2, and 3.
  • the cell in which the base station 1 and the base station 2 are located is a determined cell, and the mobile terminals 21 and 22 are determined mobile terminals.
  • the base stations 1 and 2 respectively adjust the downlink data transmission to the mobile terminals 21 and 22 to perform interference cancellation according to the downlink data and the downlink transmission control information of the coordinated mobile terminal determined by the base station 3, respectively.
  • the precoding of the mobile terminal 21 by the base station 1 and the precoding of the mobile terminal 22 by the base station 2 are respectively maintained.
  • the selection process of the cooperative mobile terminal by the first determining means 72 in the first communication means 70 of the base station joining the multi-cell MIMO cooperation will be described in more detail below.
  • the cell in which the base station 1 is located is the determined cell
  • the mobile terminal 21 is the terminal that has been determined.
  • the specific steps of the first determining means 72 in the base station 2 to select the cooperative mobile terminal are as follows.
  • the first determining means 72 in the base station 2 determines the optimal precoding for at least one mobile terminal within its cell.
  • the downlink precoding matrix between the base station 1 and the mobile terminal 21 is .
  • the first determining means 72 in the base station 2 determines the optimal precoding for each of the at least one mobile terminal within its cell according to the first predetermined rule.
  • the first predetermined rule is a criterion based on a maximum signal to interference ratio.
  • the first predetermined rule is a criterion based on block diagonalization.
  • the first predetermined rule is a criterion based on a maximum signal to noise ratio.
  • the first determining means 72 in the base station 2 selects the cooperative mobile terminal from at least one mobile terminal that has determined the optimal precoding according to the second predetermined rule.
  • the second predetermined rule is to cause the system to satisfy the maximum throughput.
  • the second predetermined rule is to satisfy fairness between the mobile terminals.
  • the determined cooperative mobile terminal is the mobile terminal 22.
  • the cell in which the base station 1 and the base station 2 are located is a determined cell, and the mobile terminals 21, 22 are already determined terminals.
  • the specific steps of the first determining means 72 in the base station 3 to select the cooperative mobile terminal are as follows.
  • the first determining means 72 in the base station 3 determines the optimal precoding for at least one mobile terminal within its cell.
  • the joint downlink precoding matrix between the base station 1, the base station 2, the base station 3, and the mobile terminals 21, 22 and any mobile terminal in the cell in which the base station 3 is located may be expressed as
  • the code matrix T 3 is a block upper triangular matrix. Because the transmission settings of the cell where the base station 1 and the base station 2 are located are maintained,
  • the first determining means 72 in the base station 3 determines the optimal precoding for each of the at least one mobile terminal within its cell according to the first predetermined rule.
  • the first predetermined rule is a criterion based on a signal to interference ratio.
  • the first determining means 72 in the base station 3 determines the optimal pre-programmed for a certain mobile terminal based on the maximum signal-to-interference ratio criterion ((( ⁇ ; '') ⁇ ⁇ "+ (H ') w ⁇ ; ' + ⁇ /)-' (// 3 * / )
  • the first predetermined rule is a criterion based on block diagonalization.
  • Joint downlink precoding matrix satisfies 3-butoxy block diagonalization.
  • the first predetermined rule is a criterion based on a maximum signal to noise ratio.
  • the first determining means 72 in the base station 3 selects the cooperative mobile terminal from the at least one mobile terminal that has determined the optimal precoding according to the second predetermined rule.
  • the second predetermined rule is to cause the system to satisfy the maximum throughput.
  • the second predetermined rule is to satisfy fairness between the mobile terminals.
  • the determined cooperative mobile terminal is the mobile terminal 23.
  • only one mobile terminal and one data stream in the cell in which each base station is located participate in multi-cell MIMO cooperation. It should be understood by those skilled in the art that the present invention is not limited thereto, and a cell in which each base station is located may have multiple mobile terminals and multiple data streams participating in the multi-cell MIM0 1" operation.
  • the device referred to in the present invention may be either a hardware device or a functional module in software, or a combination of a hardware device and a software function module.
  • FIG. 9 is a diagram showing the cell topology of a distributed multiple input multiple output communication system in accordance with one embodiment of the present invention.
  • Marks 1, 2, and 3 in Figure 9 indicate different scheduling priorities, where 1 represents the highest scheduling priority and 3 represents the lowest scheduling priority.
  • any two adjacent cells have different scheduling priorities.
  • base stations of each cell perform joint precoding and scheduling according to the order of scheduling priorities.
  • multi-cell MIMO cooperation occurs between adjacent cells, so it is convenient to implement progressive multi-cell MIMO cooperation by using a scheme according to the scheduling priority order of the base stations.
  • the scheduling priority of each cell in the system is not limited to three levels, and may be divided into four scheduling priorities, five scheduling priorities, and the like.
  • scheduling is first performed in a cell with a scheduling priority of 1, and the base station in the cell performs user selection and performs downlink transmission setting, including precoding setting, and issues a cooperation request according to the scheduling result. At this time, the cell with the priority of 1 is scheduled to become the determined cell.
  • the base station in the cell with the scheduling priority of 2 will obtain the cooperation request related to the determined cell adjacent to the cell in which it is located, according to the cooperation request and the scheduling and setting result of the determined cell, the scheduling priority is 2
  • the cell performs scheduling, performs user selection, and performs downlink transmission setting, including joint precoding setting, and issues a cooperation request according to the scheduling result.
  • the cells with the scheduling priority of 1 or 2 become the determined cells.
  • the base station in the cell with the scheduling priority of 3 will be adjacent to the cell in which it is located.
  • the determined cooperation request of the cell according to the cooperation request and the scheduling and setting result of the determined cell, perform scheduling in the cell with the scheduling priority of 3, perform user selection, and perform downlink transmission setting, including joint precoding design. set.

Description

多输入多输出系统中用于多小区协作通信的方法及装置 技术领域
本发明涉及多输入多输出技术， 尤其涉及多基站协作进行多输入 多输出传输的技术。 背景技术
为增加系统用户容量， 现有的无线通信网络往往采用低频率复用 因子， 即所有小区共享相同的时频资源， 而由低频率复用因子所带来 的小区间干扰是制约下行链路容量的一个重要因素。 对于一个位于小 区边缘（亦即相邻小区间的区域） 的移动终端， 其在接收来自其所属 基站的有用信号的同时， 还会收到其它基站使用相同的时频资源发出 的信号， 来自所述其它基站的信号就构成了对该移动终端的干扰。
为了在不损失（或提高） 小区总吞吐量的前提下提高小区边界用 户的性能， 本发明的申请人提出 了一种多小区多输入多输出
( multi-cell MIMO ) 技术。
多小区多输入多输出 （multi- cell MIMO )是一个技术族， 作为长 期演进（LTE )项目和 IEEE 802.16m的备选技术方案而被提出。 在多 小区 MIMO 技术中， 处于合作区域中的移动终端将可以得到多个基 站的服务。通过紧密地协同多个基站的发送、接收数据，多小区 MIMO 技术将小区间干扰转变成了有用信号， 从而突破了传统蜂窝系统的频 谱效率的限制。
然而也要看到， 在实时系统中， 多小区 MIMO技术所带来的回传 网络中的信息交换也是巨大的开销并带来附加延时等问题。
多小区 MIMO技术方案中包括集中式多小区 MIMO方案， 例如 网络 MIMO方案， 其运算复杂度过高。
多小区 MIMO技术方案中还包括分布式多小区 MIMO方案， 例 如合作式 MIMO 方案。 在多小区调度中， 怎样较好地定义相邻小区 之间的合作策略仍然是一个很大的挑战， 这将直接影响分布式多小区 MIMO系统的系统增益。 发明内容
为了解决现有技术中的问题，本发明提出了在 MIMO系统中用于 通信的方法及装置。
图 1示出了根据本发明的一个实施例的 MIMO系統的示意图。如 图 1所示， 基站 1和 2分别位于两个相邻小区， 为移动终端 21和 22 提供协作 MIMO传输。 图 2示出了谅实施例中的等效信道模型。 如 图 2所示， S1表示基站 1发送给移动终端 21的数据流， S2表示基站 2发送给移动终端 22的数据流； 表示数据流 Si在基站 j上的预编码 向量或矩阵； 表示移动终端 2i和基站 j之间的信道状态矩阵。 则数 据流 Sl、 S2到移动终端 21、 22之间的考虑预编码的等效信道可以表 示如下
Figure imgf000004_0001
z21/u + hutn 由上式可以看出， 两个数据流与两个移动终端之间的等效信道与小区 间信道和预编码成分紧密关联。 在一些现有技术中， 协作基站之间需 要交换完整的信道状态信息和数据信息， 带来了大量的回程传输开 销， 也使得预编码优化的计算复杂度较高。 在本发明中， 一个重要的 目的在于减少协作基站之间交换的信息量。 例如， 在上述实施例中， 仅由基站 2将预编码处理后的数据流 S2，， 即 t12S2， 发送给基站 1 , 而基站 1无需将数据流 S 1发送给基站 2。
根据本发明的第一方面， 提供了一种在多输入多输出通信系统中 用于通信的方法， 包括步骤： 确定至少由一个第一基站与一个第二基 站进行多小区多输入多输出协作； 由所述第二基站获取第一基站的已 确定下行传输控制信息， 该已确定下行传输控制信息包括第一基站所 处小区内至少一个已确定移动终端的指示信息； 由所述第二基站根据 所述第一基站的下行传输控制信息选择协作移动终端； 由所述第二基 站将所选择的协作移动终端的下行数据以及下行传输控制信息发送 给第一基站； 由第一基站根据所述协作移动终端的下行数据以及下行 传输控制信息， 调整第一基站对所述至少一个已确定移动终端的下行 数据传输。
根据本发明的第二方面， 提供了一种在多输入多输出通信系统的 基站中用于通信的方法， 包括步骤： A. 获取至少一个已确定小区的 已确定下行传输控制信息， 所述已确定下行传输控制信息包括所述至 少一个已确定小区中的各小区内的至少一个已确定移动终端的指示 信息； B. 根据所述至少一个已确定小区的下行传输控制信息， 在所 述基站所属小区内选择协作移动终端； C. 将所选择的协作移动终端 的下行数据以及下行传输控制信息发送给所述至少一个已确定小区 的基站。
根据本发明的第三方面， 提供了一种在多输入多输出通信系统的 基站中用于通信的方法， 包括步骤： a. 将所述基站所处小区中的已 确定下行传输控制信息发送给至少另一个基站， 所述已确定下行传输 控制信息包括所述基站所处小区内至少一个已确定移动终端的指示 信息； b. 获取来自所述至少另一个基站的所选择的协作移动终端的 下行数据以及下行传输控制信息； c. 根据所述协作移动终端的下行 数据以及下行传输控制信息， 调整所述基站对所述至少一个已确定移 动终端的下行数据传输。
根据本发明的第四方面， 提供了一种在多输入多输出通信系统的 基站中用于通信的第一通信装置， 包括： 第一获取装置， 用于获取至 少一个已确定小区的已确定下行传输控制信息， 所述已确定下行传输 控制信息包括所述至少一个已确定小区中的各小区内的基站与至少 定移动终端的指示信息； 第一确定装置， 用于根据所述至少一个已确 定小区的下行传输控制信息， 在所述基站所属小区内选择协作移动终 端； 第一发送装置， 用于将所选择的协作移动终端的下行数据以及下 行传输控制信息发送给所述至少一个已确定小区的基站。
根据本发明的第五方面， 提供了一种在多输入多输出通信系统的 基站中用于通信的第二通信装置， 包括： 第二发送装置， 将所述基站 所属所处小区中的已确定下行传输控制信息发送给至少另一个基站， 所述已确定下行传输控制信息包括所述基站所处小区内与至少一个 动终端的指示信息； 第二获取装置， 获取来自所述至少另一个基站的 所选择的协作移动终端的下行数据以及下行传输控制信息； 第一调整 装置， 根据所述协作移动终端的下行数据以及下行传输控制信息， 调 整所述基站对所述至少一个已确定移动终端的下行数据传输。
通过采用本发明中的方法及装置， 使用多基站 MIMO 技术的无 线通信网络将具有以下特点： 在多基站协作 MIMO 传输时， 大大降 低了基站间交换的信息量； 实现了对小区间干扰的有效抑制； 由于可 由一个或多个基站在相同时频资源上服务多个用户， 并抑制用户间的 干扰， 提高了系统的吞吐量。 附图说明
通过阅读以下参照附图对非限制性实施例所作的详细描述， 本发 明的其它特征、 目的和优点将会变得更明显。
图 1所示为 居本发明的一个实施例的 MIMO系统示意图； 图 2所示为根据本发明的一个实施例的等效信道模型；
图 3所示为根据本发明的一个实施例的 MIMO系统示意图； 图 4所示为根据本发明的一个实施例的在多输入多输出通信系统 中用于通信的方法流程图；
图 5所示为根据本发明的一个实施例的在多输入多输出通信系统 的基站中用于通信的方法流程图；
图 6所示为根椐本发明的一个实施例的在多输入多输出通信系统 的基站中用于通信的方法流程图；
图 7所示为根据本发明的一个实施例的在多输入多输出通信系统 的基站中用于通信的第一通信装置的框图；
图 8所示为根据本发明的一个实施例的在多输入多输出通信系统 的基站中用于通信的第二通信装置的框图； 图 9所示为根据本发明的一个实施例的分布式多输入多输出通信 系统的小区拓朴结构；
其中， 相同或相似的附图标记表示相同或相似的步骤特征或装置 (模块）。 具体实施方式
图 3示出了根据本发明一个实施例的 MIMO系统示意图。 如图 3 所示， 基站 1、 2、 3分别位于三个相邻小区， 为移动终端 21、 22和 23提供协作 MIMO传输。
图 4所示为根据本发明的一个实施例的在多输入多输出通信系统 中用于通信的方法流程图。 以下结合图 1、 图 2、 图 4, 从系统角度对 本发明加以说明。
在步骤 401中， 系统将确定至少由一个第一基站和一个第二基站 进行多小区 MIMO协作。
具体地， 基站 1为移动终端 21提供 MIMO传输， 当移动终端 21 移动到基站 1、 2的信号交叠区域， 也即基站 1、 2的协作区域， 系统 将确定由基站 1、 2进行多小区 MIMO协作。 其中基站 1对应于第一 基站， 基站 2对应于第二基站。
在步骤 402中， 由第二基站获取第一基站的已确定下行传输控制 信息， 该已确定下行传输控制信息包括第一基站所处小区内至少一个 已确定移动终端的指示信息。
具体地， 基站 1保持向移动终端 21传输数据时的预编码 tu， 而 基站 2获取移动终端 21的指示信息， 从而得知移动终端 21将参与多 小区协作。
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 已确定下行传输控制信息还可能包括已确定小区的基站和已 确定移动终端之间的信道信息、 下行预编码信息之中的一种或多种。
在步驟 403中， 由第二基站根据所述第一基站的下行传输控制信 息选择协作移动终端。 具体地， 基站 2根据与移动终端 21 的指示信息从基站 2所处小 区内选择移动终端 22作为协作移动终端。
在步骤 404中， 由所述第二基站将所选择的协作移动终端的下行 数据以及下行传输控制信息发送给第一基站。
具体地， 基站 2将发送给移动终端 22的预编码处理后的数据流 S2，以及移动终端 22的指示信息发送给基站 L
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 协作移动终端的下行传输控制信息还可能包括与协作移动终 端有关的信道信息、 下行预编码信息之中的一种或多种； 协作移动终 端的下行数据可能是原始数据， 也可能是经预编码处理后的数据。
在步骤 405中， 由第一基站根据所述协作移动终端的下行数据以 及下行传输控制信息， 调整第一基站对所述至少一个已确定移动终端 的下行数据传输。
具体地，基站 1将根据接收到的数据流 S2'以及移动终端 22的指 示信息， 来调整数据流 S1的发送， 以实现对数据流 S2的干扰消除。 在调整数据流 S1时， 保持基站 1对移动终端 21的预编码不变。
本发明的基本方法是对参与多小区 MIMO 协作的基站逐个进行 调度。 首先由第一基站选择参与协作的移动终端并进行传输设定， 包 括预编码设定。 然后保持第一基站的调度和设定结果不变， 由第二基 站根据第一基站的调度和设定结果来选择参与协作的移动终端并进 行传输设定， 包括联合预编码设定。 如果有第三基站参与多小区 MIMO协作， 则保持第一基站、 第二基站的调度和设定结果不变， 由 第三基站根据第一基站、 第二基站的调度和设定结杲来选择参与协作 的移动终端并进行传输设定， 包括联合预编码设定。 如果还有其他基 站参与多小区 MIMO协作， 则依此类推。
图 5所示为根据本发明的一个实施例的在多输入多输出通信系统 的基站中用于通信的方法流程图。 图 6所示为根据本发明的一个实施 例的在多输入多输出通信系统的基站中用于通信的方法流程图。 以下 结合图 1、 图 2、 图 3、 图 5、 图 6, 从基站的角度对本发明加以说明。 在步骤 501 中，最新一个加入多小区 ΜΙΜΟ协作的基站将获取至 少一个已确定小区的已确定下行传输控制信息， 所述已确定下行传输 控制信息包括所述至少一个已确定小区中的各小区内的至少一个已 确定移动终端的指示信息。
例如， 在基站 1 和基站 2之间进行多小区 ΜΙΜΟ协作， 基站 1 已经完成用户调度和包括预编码设定在内的传输设定， 其中移动终端 21 涉及到多小区 ΜΙΜΟ协作， 则基站 1所处小区称为已确定小区， 移动终端 21称为已确定移动终端。基站 2将获取移动终端 21的指示 信息， 从而得知移动终端 21将参与多小区协作。
又例如， 在基站 1、 2、 3之间进行多小区 ΜΙΜΟ协作， 基站 1、 基站 2已经完成用户调度和包括预编码设定在内的传输设定， 其中移 动终端 21和移动终端 22涉及到多小区 ΜΙΜΟ协作， 则基站 1、 基站 2所处小区称为已确定小区， 移动终端 21、 22称为已确定移动终端。 基站 3将获取移动终端 21、 22的指示信息， 从而得知移动终端 21、 22将参与多小区协作。
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 已确定下行传输控制信息还可能包括已确定小区的基站和已 确定移动终端之间的信道信息、 下行预编码信息之中的一种或多种。
在步骤 502中，新加入多小区 ΜΙΜΟ协作的基站将根据所述至少 一个已确定小区的下行传输控制信息， 在所述基站所属小区内选择协 作移动终端。
例如， 在基站 1 和基站 2之间进行多小区 ΜΙΜΟ协作， 基站 2 是新加入多小区 ΜΙΜΟ协作的基站， 则基站 2根据基站 1 所处小区 的下行传输控制信息在基站 2所处小区内的移动终端中进行选择， 并 将移动终端 22确定为协作移动终端。
又例如， 在基站 1、 2、 3之间进行多小区 ΜΙΜΟ协作， 基站 3 是新加入多小区 ΜΙΜΟ协作的基站， 则基站 3根据基站 1、 基站 2所 处小区的下行传输控制信息在基站 3所处小区内的移动终端中进行选 择， 并将移动终端 23确定为协作移动终端。 在步骤 503中，新加入多小区 MIMO协作的基站将所选择的协作 移动终端的下行数据以及下行传输控制信息发送给所述至少一个已 确定小区的基站。
例如， 例如， 在基站 1和基站 2之间进行多小区 MIMO协作， 基 站 2是新加入多小区 MIMO协作的基站， 其确定的协作移动终端为 移动终端 22, 则基站 2将发送给移动终端 22的预编码处理后的数据 以及移动终端 22的下行传输控制信息发送给基站 1。
又例如， 在基站 1、 2、 3之间进行多小区 MIMO协作， 基站 3 是新加入多小区 MIMO 协作的基站， 其确定的协作移动终端为移动 终端 23 , 则基站 3将发送给移动终端 23的预编码处理后的数据以及 移动终端 23的下行传输控制信息发送给基站 1、 基站 2。
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 协作移动终端的下行传输控制信息还可能包括与协作移动终 端有关的信道信息、 下行预编码信息之中的一种或多种； 协作移动终 端的下行数据可能是原始数据， 也可能是经预编码处理后的数据。
在步骤 601 中，一个加入多小区 MIMO协作的已确定小区的基站 将该小区中的已确定下行传输控制信息发送给一个新加入多小区 MIMO协作的基站，所述已确定下行传输控制信息包括所述已确定小 区内至少一个已确定移动终端的指示信息。
例如， 在基站 1 和基站 2之间进行多小区 MIMO协作， 基站 1 所处小区为已确定小区， 移动终端 21 为已确定移动终端， 基站 2需 确定其所处小区内参与多小区 MIMO协作的移动终端及其传输设定。 则基站 1将移动终端 21的指示信息发送给基站 2。
又例如， 在基站 1、 2、 3之间进行多小区 MIMO协作， 基站 1、 基站 2所处小区为已确定小区， 移动终端 21、 22为已确定移动终端， 基站 3 需要确定其所处小区内参与多小区 MIMO协作的移动终端及 其传输设定。 则基站 1、 2分别将移动终端 21、 22的指示信息发送给 基站 3。
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 已确定下行传输控制信息还可能包括已确定小区的基站和已 确定移动终端之间的信道信息、 下行预编码信息之中的一种或多种。
在步骤 602 中， 已确定小区的基站将获取来自新加入多小区 MIMO 协作的基站的所选择的协作移动终端的下行数据以及下行传 输控制信息。
例如， 在基站 1 和基站 2之间进行多小区 MIMO协作， 基站 1 所处小区为已确定小区。 则基站 1将获取来自基站 2的所选择的协作 移动终端的下行数据以及下行传输控制信息
又例如， 在基站 1、 2、 3之间进行多小区 MIMO协作， 基站 1、 基站 2所处小区为已确定小区。 则基站 1、 2分别获取来自基站 3的 所选择的协作移动终端的下行数据以及下行传输控制信息。
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 协作移动终端的下行传输控制信息还可能包括与协作移动终 端有关的信道信息、 下行预编码信息之中的一种或多种； 协作移动终 端的下行数据可能是原始数据， 也可能是经预编码处理后的数据。
在步骤 603中， 已确定小区的基站将根据所述协作移动终端的下 行数据以及下行传输控制信息， 调整所述已确定基站对所述至少一个 已确定移动终端的下行数据传输。
例如， 在基站 1 和基站 2之间进行多小区 MIMO协作， 基站 1 所处小区为已确定小区， 移动终端 21 为已确定移动终端。 则基站 1 根据基站 2所确定的协作移动终端的下行数据和下行传输控制信息， 调整对移动终端 21 的下行数据传输， 以进行干扰消除。 在调整数据 发送时， 保持基站 1对移动终端 21的预编码不变。
又例如， 在基站 1、 2、 3之间进行多小区 ΜίΜΟ协作， 基站 1、 基站 2所处小区为已确定小区， 移动终端 21、 22为已确定移动终端。 则基站 1、 2根据基站 3所确定的协作移动终端的下行数据和下行传 输控制信息， 分别调整对移动终端 21、 22的下行数据传输， 以进行 干扰消除。 在调整数据发送时， 分别保持基站 1对移动终端 21 的预 编码和基站 2对移动终端 11的预编码不变。 前述步骤 403和步骤 502中可以采用相似的具体操作。 以下将更 为详细地描述加入多小区 MIMO 协作的基站对协作移动终端的选择 过程。
以基站 1、 基站 2之间的两小区 MIMO协作为例， 基站 1所处小 区是已确定小区， 移动终端 21是已经确定终端。 基站 2选择协作移 动终端的具体步骤如下。
首先， 基站 2为其所处小区内的至少一个移动终端确定最优预编 码。 基站 1和移动终端 21之间的下行预编码矩阵为^。 基站 1、 基站 2和移动终端 21以及基站 2所处小区内任一移动终端之间的联合下行 预编码矩阵可以表示为
Figure imgf000012_0001
因为基站 1并未将发送给移动终端 21的数据流 S1通知给基站 2, 所以有 4 = 0。 联合预编码矩阵 Τ2是一个块上三角矩阵。 因为要保持 基站 1所处小区的传输设定， 所以 两个基站和两个移动终端之 间的等效信道可以表示为
Figure imgf000012_0003
然后， 基站 2根据第一预定规则来为其所处小区内的至少一个移 动终端中的每一个分别确定最优预编码。
根据本发明的一个实施例， 第一预定规则是基于信号干扰比的判 断准则。
在 Κ个用户的多用户 MIMO系统中， 第 k个用户的干扰功率被 定义为： 由第 k个用户所引起的被其他用户接收到的干扰的总功率， 其可以表示为
Figure imgf000012_0002
, 其中 tk是第 k个用户的 M x 1的 预编码向量， 对于第 k个用户的 MIMO信道为 Ν Μ的矩阵 。 因 为不同用户的信号干扰比 （ signal to jamming and noise ratio, SJNR ) 是彼此独立的， 因此可以分别设计不同用户的预编码。 基于最大信号
Figure imgf000013_0001
根据 1985 年由剑桥大学出版社出版的 "矩阵分析通信" （R. A, Horn and C. R. Johnson, Matrix Analysis Communications, Cambridge University Press, U.S.A., 1985 )， 第 k个用户的最优预编码 是对应于 矩阵对 Hk和 Hk + N0 /Pk I的最大特征值的特征向量。
根据 1996年由约翰霍普金斯大学出版社出版的 "矩阵运算"（ G. H. Golub and C. F. V. Loan, Matrix Computations, 3rd ed., London: Johns Hopkins University Press, 1996 ), 当上述矩阵对中后一个是可逆矩阵 时， 最优预编码的结果可以表示为 其中 表示 的最大特征值对应的特征向量， 是第 k个用户的发 射机功率， 而且 0 !^ +^1 -、 。
k
在上述两基站 MIMO协作的情况下，基站 2为某一个移动终端确
N,
定的最优预编码为 /; = X (((H; H; (Hi H[)。 根据本发明的另一个实施例， 第一预定规则是基于块对角化的判 断准则。
对于多个用户的 MIMO信道，满足块对角化就是为某一用户寻找 其他用户的信道组成的子空间的零空间， 用公式表示为 HiGj = 0, (/≠ j) , 其中（^是 第 j个用户的预编码矩阵。
在下行块对角化算法中，第 k个用户的预编码是两个矩阵的乘积：
Figure imgf000013_0002
其中^ )在其他信道空间的零空间中， 表示为 H ^ = Qj≠fc , 其中 是 的奇异值分解的右酉矩阵。
在上述两基站 MIMO协作的情况下，基站 2为某一个移动终端确 定的最优预编码矩阵为 。 2 (|)， 其中 。)在移动终端 21的信道空间 的零空间中， 亦即
Figure imgf000013_0003
其中 2 )是 H 的奇异值分解的右酉 矩阵。 也就是说， 联合下行预编码矩阵 T2满足块对角化。
根据本发明的另一个实施例， 第一预定规则是基于最大信噪比的 判断准则。
然后， 基站 2根据第二预定规则从至少一个确定了最优预编码的 移动终端中选择协作移动终端。
根据本发明的一个实施例， 第二预定规则是使得系统满足最大吞 吐量。
根据本发明的另一个实施例， 第二预定规则是满足各移动终端之 间的公平性。
如图 1所示， 例如， 所确定的协作移动终端是移动终端 22。
以基站 1、 基站 2、 基站 3之间的三小区 MIMO协作为例， 基站
1、基站 2所处小区是已确定小区， 移动终端 21、 22是已经确定终端。 基站 3选择协作移动终端的具体步骤如下。
首先， 基站 3为其所处小区内的至少一个移动终端确定最优预编 码。 基站 1、 基站 2、 基站 3和移动终端 21、 22以及基站 3所处小区 内任一移动终端之间的联合下行预编码矩 其中
Figure imgf000014_0001
基站 1并未将发送给移动终端 21的数据流 S1通知给基站 3 , 基 站 2并未将发送给移动终端 22的数据流 S2通知给基站 3 , 联合预编 码矩阵 T3是一个块上三角矩阵。 因为要保持基站 1、 基站 2所处小区 的传输设定， 所以有
Figure imgf000014_0003
三个基站和三个移动终端之间的等效信道更新为
Figure imgf000014_0002
然后， 基站 3根据第一预定规则来为其所处小区内的至少一个移 动终端中的每一个分别确定最优预编码。
根据本发明的一个实施例， 第一预定规则是基于信号干扰比的判 断准则。 在上述三基站 MIMO协作的情况下， 基站 3基于最大信号 干扰比准则为某一个移动终端确定的最优预编码为 尸
根据本发明的另一个实施例， 第一预定规则是基于块对角化的判 断准则。 在上述三基站 MIMO协作的情况下， 基站 3基于块对角化 准则为某一个移动终端确定的最优预编码为 ζ = m , 其中 。)在移 动终端 21、 22的信道空间的零空间中， 亦即 ：„ v = Q ≠k , 其中 是 H; 3(。)的奇异值分解的右酉矩阵。 也就是说， 联合下行预编码矩阵 T3满足块对角化。
根据本发明的另一个实施例， 第一预定规则是基于最大信噪比的 判断准则。
然后， 基站 3根据第二预定规则从至少一个确定了最优预编码的 移动终端中选择协作移动终端。
根据本发明的一个实施例， 第二预定规则是使得系统满足最大吞 吐量。
根据本发明的另一个实施例， 第二预定规则是满足各移动终端之 间的公平性。
如图 3所示， 例如， 所确定的协作移动终端是移动终端 23。 在以上的实施例中， 各基站所处小区仅有一个移动终端和一个数 据流参与多小区 MIMO 协作。 本领域技术人员应该能够理解， 本发 明不限于此， 各基站所处小区可以有多个移动终端以及多个数据流参 与多小区 MIMO协作。
图 7所示为根据本发明的一个实施例的在多输入多输出通信系统 的基站中用于通信的第一通信装置的框图。 如图 7所示， 第一通信装 置 70包括第一获取装置 71、 第一确定装置 72、 第一发送装置 73。 典 型地， 第一通信装置 70设置于 MIMO系统中的基站中。 图 8所示为 根据本发明的一个实施例的在多输入多输出通信系统的基站中用于 通信的第二通信装置的框图。 如图 8所示， 第二通信装置 80包括第 二发送装置 81、 第二获取装置 82、 第一调整装置 83。 典型地， 第二 通信装置 80设置于 MIMO系统的基站中。 以下结合图 1、 图 2、 图 3、 图 7、 图 8 , 从装置的角度对本发明加以说明。
在最新一个加入多小区 MIMO协作的基站一侧， 首先， 将由其第 一通信装置 70中的第一获取装置 71获取至少一个已确定小区的已确 定下行传输控制信息， 所述已确定下行传输控制信息包括所述至少一 个已确定小区中的各小区内的至少一个已确定移动终端的指示信息。
例如， 在基站 1 和基站 2之间进行多小区 MIMO协作， 基站 1 已经完成用户调度和包括预编码设定在内的传输设定， 其中移动终端 21 涉及到多小区 MIMO协作， 则基站 1所处小区称为已确定小区， 移动终端 21称为已确定移动终端。基站 2中的第一获取装置 71将获 取移动终端 21的指示信息，从而得知移动终端 21将参与多小区协作。
又例如， 在基站 1、 2、 3之间进行多小区 MIMO协作， 基站 1、 基站 2已经完成用户调度和包括预编码设定在内的传输设定， 其中移 动终端 21和移动终端 22涉及到多小区 MIMO协作， 则基站 1、 基站 2所处小区称为已确定小区， 移动终端 21、 22称为已确定移动终端。 基站 3中的第一获取装置 71将获取移动终端 21、 22的指示信息， 从 而得知移动终端 21、 22将参与多小区协作。
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 已确定下行传输控制信息还可能包括已确定小区的基站和已 确定移动终端之间的信道信息、 下行预编码信息之中的一种或多种。
然后， 新加入多小区 MIMO协作的基站将由其第一通信装置 70 中的第一确定装置 72根据所述至少一个已确定小区的下行传输控制 信息， 在所述基站所属小区内选择协作移动终端。
例如， 在基站 1 和基站 1之间进行多小区 MIMO协作， 基站 2 是新加入多小区 MIMO协作的基站， 则基站 2中的第一确定装置 72 根据基站 1所处小区的下行传输控制信息在基站 2所处小区内的移动 终端中进行选择， 并将移动终端 22确定为协作移动终端。
又例如， 在基站 1、 2、 3之间进行多小区 MIMO协作， 基站 3 是新加入多小区 MIMO协作的基站 , 则基站 3中的第一确定装置 72 根据基站 1、 基站 2所处小区的下行传输控制信息在基站 3所处小区 内的移动终端中进行选择， 并将移动终端 23确定为协作移动终端。
随后， 新加入多小区 MIMO协作的基站将由其第一通信装置 70 中的第一发送装置 73将所选择的协作移动终端的下行数据以及下行 传输控制信息发送给所述至少一个已确定小区的基站。
例如， 在基站 1 和基站 2之间进行多小区 MIMO协作， 基站 2 是新加入多小区 MIMO 协作的基站， 其确定的协作移动终端为移动 终端 22，则基站 2中的第一发送装置 73将发送给移动终端 22的预编 码处理后的数据以及移动终端 22的下行传输控制信息发送给基站 1。
又例如， 在基站 1、 2、 3之间进行多小区 MIMO千办作， 基站 3 是新加入多小区 MIMO 协作的基站， 其确定的协作移动终端为移动 终端 23 ,则基站 3中的第一发送装置 73将发送给移动终端 23的预编 码处理后的数据以及移动终端 23的下行传输控制信息发送给基站 1、 基站 2。
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 协作移动终端的下行传输控制信息还可能包括与协作移动终 端有关的信道信息、 下行预编码信息之中的一种或多种； 协作移动终 端的下行数据可能是原始数据， 也可能是经预编码处理后的数据。
在一个加入多小区 MIMO协作的已确定小区的基站一侧， 首先， 谚基站将由其第二通信装置 80中的第二发送装置 81将该小区中的已 确定下行传输控制信息发送给一个新加入多小区 MIMO协作的基站， 所述已确定下行传输控制信息包括所述已确定小区内至少一个已确 定移动终端的指示信息。
例如， 在基站 1 和基站 2之间进行多小区 MIMO协作， 基站 1 所处小区为已确定小区， 移动终端 21 为已确定移动终端， 基站 2需 确定其所处小区内参与多小区 MIMO协作的移动终端及其传输设定。 则基站 1中的第二发送装置 81将移动终端 21的指示信息发送给基站 2。 又例如， 在基站 1、 2、 3之间进行多小区 MIMO协作， 基站 1、 基站 2所处小区为已确定小区， 移动终端 21、 22为已确定移动终端， 基站 3 需要确定其所处小区内参与多小区 MIMO协作的移动终端及 其传输设定。 则基站 1、 2分别由各自的第二发送装置 81将移动终端 21、 22的指示信息发送给基站 3。
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 已确定下行传输控制信息还可能包括已确定小区的基站和已 确定移动终端之间的信道信息、 下行预编码信息之中的一种或多种。
然后， 已确定小区的基站将由其第二通信装置 80 中的第二获取 装置 82获取来自新加入多小区 MIMO协作的基站的所选择的协作移 动终端的下行数据以 '及下行传输控制信息。
例如， 在基站 1 和基站 2之间进行多小区 MIMO协作， 基站 1 所处小区为已确定小区。 则基站 1将由其第二获取装置 82获取来自 基站 2的所选择的协作移动终端的下行数据以及下行传输控制信息。
又例如， 在基站 1、 2、 3之间进行多小区 MIMO协作， 基站 1、 基站 2所处小区为已确定小区。 则基站 1、 2分别由各自的第二获取 装置 82获取来自基站 3的所选择的协作移动终端的下行数据以及下 行传输控制信息。
根据基站之间所采取的交互方式的不同， 在本发明的其他一些实 施例中， 协作移动终端的下行传输控制信息还可能包括与协作移动终 端有关的信道信息、 下行预编码信息之中的一种或多种； 协作移动终 端的下行数据可能是原始数据， 也可能是经预编码处理后的数据。
随后， 已确定小区的基站将由其第二通信装置 80 中的第一调整 装置 83根据所述协作移动终端的下行数据以及下行传输控制信息， 调整所述已确定基站对所述至少一个已确定移动终端的下行数据传 输。
例如， 在基站 1 和基站 2之间进行多小区 MIMO协作， 基站 1 所处小区为已确定小区， 移动终端 21 为已确定移动终端。 则基站 1 由其第一调整装置 83根据基站 2所确定的协作移动终端的下行数据 和下行传输控制信息， 调整对移动终端 21 的下行数据传输， 以进行 千扰消除。 在调整数据发送时， 保持基站 1对移动终端 21 的预编码 不变。
又例如， 在基站 1、 2、 3之间进行多小区 MIMO协作， 基站 1、 基站 2所处小区为已确定小区， 移动终端 21、 22为已确定移动终端。 则基站 1、 2分别由各自的第一调整装置 83根据基站 3所确定的协作 移动终端的下行数据和下行传输控制信息， 分别调整对移动终端 21、 22的下行数据传输， 以进行干扰消除。 在调整数据发送时， 分别保持 基站 1对移动终端 21的预编码和基站 2对移动终端 22的预编码不变。
以下将更为详细地描述加入多小区 MIMO 协作的基站的第一通 信装置 70中的第一确定装置 72对协作移动终端的选择过程。
以基站 1、 基站 2之间的两小区 MIMO协作为例 , 基站 1所处小 区是已确定小区， 移动终端 21是已经确定终端。 基站 2中的第一确 定装置 72选择协作移动终端的具体步骤如下。
首先， 基站 2中的第一确定装置 72为其所处小区内的至少一个 移动终端确定最优预编码。 基站 1和移动终端 21之间的下行预编码 矩阵为 ,;。 基站 1、 基站 2和移动终端 21以及基站 2所处小区内任一 移.
Figure imgf000019_0001
因为基站 1并未将发送给移动终端 21的数据流 S1通知给基站 2, 所以有 = 0。 联合预编码矩阵 T2是一个块上三角矩阵。 因为要保持 基站 1所处小区的传输设定， 所以 t;', = t；。 两个基站和两个移动终端之 间的等效信道可以表示为
h、
Figure imgf000019_0002
然后， 基站 2 中的第一确定装置 72根据第一预定规则来为其所 处小区内的至少一个移动终端中的每一个分别确定最优预编码。
根据本发明的一个实施例， 第一预定规则是基于最大信号干扰比 的判断准则。 在上述两基站 MIMO协作的情况下， 基站 2 中的第一 确定装置 72基于最大信号干扰比准则为某一个移动终端确定的最优 预编码为 ^ = X ((( ) H H; + ^- I)-] (H2 )H H; ) 0 根据本发明的另一个实施例， 第一预定规则是基于块对角化的判 断准则。 在上述两基站 MIMO协作的情况下， 基站 2 中的第一确定 装置 72为某一个移动终端确定的最优预编码矩阵为^ = ^ "， 其中 在移动终端 21的信道空间的零空间中，亦即 °) = 0, ,其中^ 是 的奇异值分解的右酉矩阵。 也就是说， 联合下行预编码矩阵 T2满足块对角化。
根据本发明的另一个实施例， 第一预定规则是基于最大信噪比的 判断准则。
然后， 基站 2 中的第一确定装置 72根据第二预定规则从确定了 最优预编码的至少一个移动终端中选择协作移动终端。
根据本发明的一个实施例， 第二预定规则是使得系统满足最大吞 吐量。
根据本发明的另一个实施例， 第二预定规则是满足各移动终端之 间的公平性。
如图 1所示， 例如， 所确定的协作移动终端是移动终端 22。
以基站 1、 基站 2、 基站 3之间的三小区 ΜΙΜΟ协作为例， 基站 1、基站 2所处小区是已确定小区， 移动终端 21、 22是已经确定终端。 基站 3中的第一确定装置 72选择协作移动终端的具体步骤如下。
首先， 基站 3 中的第一确定装置 72为其所处小区内的至少一个 移动终端确定最优预编码。 基站 1、 基站 2、 基站 3和移动终端 21、 22 以及基站 3 所处小区内任一移动终端之间的联合下行预编码矩阵 可以表示为
7 = k t2 ti- 2| t22 ^23 ， 其中 基站 1并未将发送给移动终端 21的数据流 S1通知给基站 3 , 基 站 2并未将发送给移动终端 22的数据流 S2通知给基站 3 , 联合预编
I S 码矩阵 T3是一个块上三角矩阵。 因为要保持基站 1、 基站 2所处小区 的传输设定， 所以有
Figure imgf000021_0002
三个基站和三个移动终端之间的等效信道更新为
Figure imgf000021_0001
然后， 基站 3 中的第一确定装置 72根据第一预定规则来为其所 处小区内的至少一个移动终端中的每一个分别确定最优预编码。
根据本发明的一个实施例， 第一预定规则是基于信号干扰比的判 断准则。 在上述三基站 MIMO协作的情况下， 基站 3 中的第一确定 装置 72基于最大信号干扰比准则为某一个移动终端确定的最优预编 ^ ^^χζ(((Η;'')Η Η;" + (H ')w Η;' +^/)-'(//3* / ) 根据本发明的另一个实施例， 第一预定规则是基于块对角化的判 断准则。 在上述三基站 MIMO协作的情况下， 基站 3 中的第一确定 装置 72 基于块对角化准则为某一个移动终端确定的最优预编码为 = 0)ν ), 其中 (。)在移动终端 21、 22的信道空间的零空间中， 亦即 °> = (U≠ ,其中 V3 是 Η' 的奇异值分解的右酉矩阵。也就是说 ,
H:
联合下行预编码矩阵丁3满足块对角化。
根据本发明的另一个实施例， 第一预定规则是基于最大信噪比的 判断准则。
然后， 基站 3 中的第一确定装置 72根据第二预定规则从至少一 个确定了最优预编码的移动终端中选择协作移动终端。
根据本发明的一个实施例， 第二预定规则是使得系统满足最大吞 吐量。
根据本发明的另一个实施例， 第二预定规则是满足各移动终端之 间的公平性。 如图 3所示， 例如， 所确定的协作移动终端是移动终端 23。
在以上的实施例中， 各基站所处小区仅有一个移动终端和一个数 据流参与多小区 MIMO 协作。 本领域技术人员应谅能够理解， 本发 明不限于此， 各基站所处小区可以有多个移动终端以及多个数据流参 与多小区 MIM0 1"办作。
本领域扶术人员应能理解， 本发明中所称的装置， 既可以是硬件 设备， 也可以是软件中的功能模块， 还可以是硬件设备和软件功能模 块的结合。
本发明中的方法及装置可以用于分布式多输入多输出系统。 图 9 所示为根据本发明的一个实施例的分布式多输入多输出通信系统的 小区拓朴结构。 图 9中标记 1、 2、 3表示不同的调度优先级， 其中 1 代表调度优先級最高， 3代表调度优先级最低。 如图 9所示， i亥实施 例中的多输入多输出通信系统中， 任意两个相邻小区具有不同的调度 优先级。 在多小区 MIMO 协作时， 各小区的基站根据调度优先级的 顺序来进行联合预编码和调度。 通常， 多小区 MIMO 协作发生在相 邻小区之间， 因此采用根据基站的调度优先级顺序来进行调度的方案 可以很方便地实现渐进式多小区 MIMO 协作。 本领域技术人员应能 理解， 系统中各小区的调度优先级划分不限于 3种级别， 还可以划分 为 4种调度优先级、 5种调度优先级， 等。
在本实施例中， 首先在调度优先级为 1的小区中执行调度， 由小 区中的基站进行用户选择并进行下行传输设定， 包括预编码设定， 并 根据调度结果发出协作请求。 此时调度优先级为 1的小区成为已确定 小区。
然后， 调度优先级为 2的小区中的基站将获得与其所处小区相邻 的已确定小区有关的协作请求， 根据协作请求以及已确定小区的调度 和设定结果， 在调度优先级为 2的小区中执行调度， 进行用户选择并 进行下行传输设定， 包括联合预编码设定， 并根据调度结果发出协作 请求。 此时， 调度优先级为 1或 2的小区均成为已确定小区。
最后， 调度优先级为 3的小区中的基站将获得与其所处小区相邻 的已确定小区有关的协作请求， 根据协作请求以及已确定小区的调度 和设定结果， 在调度优先级为 3的小区中执行调度， 进行用户选择并 进行下行传输设定， 包括联合预编码设定。
以上对本发明的实施例进行了描述， 但是本发明并不局限于特定 的系统、 设备和具体协议， 本领域内技术人员可以在所附权利要求的 范围内做出各种变形或修改。

Claims

权 利 要 求 书
1. 一种在多输入多输出通信系统中用于通信的方法， 包括步骤： 确定至少由一个第一基站与一个第二基站进行多小区多输入多 输出协作；
由所述第二基站获取第一基站的已确定下行传输控制信息， 该已 确定下行传输控制信息包括第一基站所处小区内至少一个已确定移 动终端的指示信息；
由所述第二基站根据所述第一基站的下行传输控制信息选择协 作移动终端；
由所述第二基站将所选择的协作移动终 的下行数据以及下行 传输控制信息发送给第一基站；
由第一基站根据所述协作移动终端的下行数据以及下行传输控 制信息， 调整第一基站对所述至少一个已确定移动终端的下行数据传 输。
2. 根据权利要求 1 所述的方法， 其特征在于， 第二基站选择协 作移动终端的步驟包括：
根据所述第一基站的已确定下行传输控制信息， 基于第一预定规 则， 为所述第二基站所属小区中的至少一个移动终端中的每一个构造 联合下行预编码矩阵， 其中第一基站与所述至少一个已确定移动终端 基于第二预定规则， 从所述至少一个移动终端中选择协作移动终 端。
3. 根据权利要求 2所述的方法， 其特征在于， 所述联合下行预 编码矩阵为块三角矩阵。
4. 根据权利要求 3 所述的方法， 其特征在于， 所述第一预定规 则为： 所构造的联合下行预编码矩阵使得相应移动终端的信号满足最 大信号干扰比。
5. 根据权利要求 3 所述的方法， 其特征在于， 所述第一预定规 则为： 所构造的联合下行预编码矩阵满足块对角化。
6. 根据权利要求 2至 5 中任一项所述的方法， 其特征在于， 所 述第二预定规则为： 满足系统吞吐量最大或者满足移动终端的公平 性。
7. —种在多输入多输出通信系统的基站中用于通信的方法， 包 括步骤：
A. 获取至少一个已确定小区的已确定下行传输控制信息， 所述 已确定下行传输控制信息包括所述至少一个已确定小区中的各小区 内的至少一个已确定移动终端的指示信息；
B. 根据所述至少一个已确定小区的下行传输控制信息， 在所述 基站所属小区内选择协作移动终端；
C. 将所选择的协作移动终端的下行数据以及下行传输控制信息 发送给所述至少一个已确定小区的基站。
8. 根据权利要求 7所述的方法， 其特征在于， 所述步骤 B包括： B1. 根据所述至少一个已确定小区的已确定下行传输控制信息， 基于第一预定规则， 为所述基站所属小区中的至少一个移动终端中的 每一个构造联合下行预编码矩阵， 其中与各已确定小区中的已确定移
B2. 基于第二预定规则， 从所述基站所属小区中的所述至少一个 移动终端中选择协作移动终端。
9. 根据权利要求 8 所述的方法， 其特征在于， 所述联合下行预 编码矩阵为块三角矩阵。
10. 根据权利要求 9所述的方法， 其特征在于， 所述第一预定规 则为： 所构造的联合下行预编码矩阵使得相应移动终端的信号满足最 大信号干扰比。
11. 根据权利要求 9所述的方法， 其特征在于， 所述第一预定规 则为： 所构造的联合下行预编码矩阵满足块对角化。
12. 根据权利要求 8至 11 中任一项所述的方法， 其特征在于， 所述第二预定规则为： 满足系统吞吐量最大或者满足移动终端的公平 性。
13. 根据权利要求 8至 12中任一项所述的方法， 其特征在于， 多输入多输出通信系统为分布式系统， 所述基站具有与所述至少一个 已确定小区中的基站不同的调度优先级， 并根据调度优先级的顺序进 行联合预编码和调度。
14. 一种在多输入多输出通信系统的基站中用于通信的方法， 包 括步骤：
a. 将所述基站所处小区中的已确定下行传输控制信息发送给至 少另一个基站， 所述已确定下行传输控制信息包括所述基站所处小区 内至少一个已确定移动终端的指示信息；
b . 获取来自所述至少另一个基站的所选择的协作移动终端的下 行数据以及下行传输控制信息；
c 根据所述协作移动终端的下行数据以及下行传输控制信息， 调整所述基站对所述至少一个已确定移动终端的下行数据传输。
15. 根据权利要求 14所述的方法， 其特征在于， 所述多输入多 输出通信系统为分布式系统， 所述基站具有与所述至少另一个基站不 同的调度优先级， 并根据调度优先级的顺序进行联合预编码和调度。
16. 一种在多输入多输出通信系统的基站中用于通信的第一通信 装置， 包括：
第一获取装置， 用于获取至少一个已确定小区的已确定下行传输 控制信息， 所述已确定下行传输控制信息包括所述至少一个已确定小 区中的各小区内的基站与至少一个已确定移动终端之间的下行预编 码矩阵以及所述至少一个已确定移动终端的指示信息；
第一确定装置， 用于根据所述至少一个已确定小区的下行传输控 制信息， 在所述基站所属小区内选择协作移动终端；
第一发送装置， 用于将所选择的协作移动终端的下行数据以及下 行传输控制信息发送给所述至少一个已确定小区的基站。
17. 根据权利要求 16 所述的第一通信装置， 其特征在于， 所述 第一确定装置用于： 根据所述至少一个已确定小区的已确定下行传输控制信息， 基于 第一预定规则， 为所述基站所属小区中的至少一个移动终端中的每一 个构造联合下行预编码矩阵， 其中与各已确定小区中的已确定移动终 基于第二预定规则， 从所述基站所属小区中的所述至少一个移动 终端中选择协作移动终端。
18. 根据权利要求 17 所述的第一通信装置， 其特征在于， 所述 联合下行预编码矩阵为块三角矩阵。
19. 根据权利要求 18 所述的第一通信装置， 其特征在于， 所述 第一预定规则为： 所构造的联合下行预编码矩阵使得相应移动终端的 信号满足最大信号干扰比。
20. 根据权利要求 18 所述的第一通信装置， 其特征在于， 所述 第一预定规则为： 所构造的联合下行预编码矩阵满足块对角化。
21. 根据权利要求 17至 20中任一项所述的第一通信装置， 其特 征在于， 所述第二预定规则为： 满足系统吞吐量最大或者满足移动终 端的公平性。
22. 一种在多输入多输出通信系统的基站中用于通信的第二通信 装置， 包括：
第二发送装置， 将所述基站所属所处小区中的已确定下行传输控 制信息发送给至少另一个基站， 所述已确定下行传输控制信息包括所 述基站所处小区内与至少一个已确定移动终端之间的下行预编码矩 阵以及所述至少一个已确定移动终端的指示信息；
第二获取装置， 获取来自所述至少另一个基站的所选择的协作移 动终端的下行数据以及下行传输控制信息；
第一调整装置， 根据所述协作移动终端的下行数据以及下行传输 控制信息， 调整所述基站对所述至少一个已确定移动终端的下行数据 传输。
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