WO2011029400A1 - 协作通信的方法及基站 - Google Patents
协作通信的方法及基站 Download PDFInfo
- Publication number
- WO2011029400A1 WO2011029400A1 PCT/CN2010/076761 CN2010076761W WO2011029400A1 WO 2011029400 A1 WO2011029400 A1 WO 2011029400A1 CN 2010076761 W CN2010076761 W CN 2010076761W WO 2011029400 A1 WO2011029400 A1 WO 2011029400A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- matrix
- base station
- direction matrix
- mobile terminal
- precoding
- Prior art date
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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
- H04B7/0452—Multi-user MIMO systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
- H04L25/03898—Spatial equalizers codebook-based design
- H04L25/03904—Spatial equalizers codebook-based design cooperative design, e.g. exchanging of codebook information between base stations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
- H04L25/03898—Spatial equalizers codebook-based design
- H04L25/0391—Spatial equalizers codebook-based design construction details of matrices
-
- 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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
- H04L25/03949—Spatial equalizers equalizer selection or adaptation based on feedback
Definitions
- the embodiments of the present invention relate to the field of communications, and in particular, to a method and a base station for precoding in cooperative communication.
- a base station acquires channel state information (CSI) of a mobile terminal (MS), according to The CSI information is communicated with the MS using a space division multiple access technique.
- CSI channel state information
- MS mobile terminal
- the distributed cooperative MIMO system application scenarios in the current research are mostly single-user multi-antenna or multi-user single antenna.
- the number of antennas per base station is greater than the total number of antennas of the terminals it serves, and its application is obviously limited.
- Embodiments of the present invention provide a distributed cooperative communication method capable of performing precoding based on local channel state information; and simultaneously serving a plurality of multi-antenna mobile terminals.
- the method for cooperative communication provided by the embodiment of the present invention is: obtaining a direction matrix corresponding to a target mobile terminal, where the number of rows of the direction matrix is based on the total number of mobile terminal antennas in the cooperation area and the target mobile terminal The number of antennas is determined, The number of columns of the direction matrix is determined according to the number of code streams transmitted to the target mobile terminal; the precoding matrix is calculated according to the local channel state information and the direction matrix; precoding is performed according to the precoding matrix, and cooperative communication is performed.
- the embodiment of the present invention further provides a cooperative base station, where the base station includes: a direction matrix determining unit, configured to obtain a direction matrix corresponding to a target mobile terminal, where the number of rows of the direction matrix is according to the collaboration area The total number of mobile terminal antennas is determined by the number of antennas of the target mobile terminal, and the number of columns of the direction matrix is determined according to the number of code streams transmitted to the target mobile terminal;
- a direction matrix determining unit configured to obtain a direction matrix corresponding to a target mobile terminal, where the number of rows of the direction matrix is according to the collaboration area
- the total number of mobile terminal antennas is determined by the number of antennas of the target mobile terminal, and the number of columns of the direction matrix is determined according to the number of code streams transmitted to the target mobile terminal;
- the method and the base station of the embodiments of the present invention use the method of the agreed direction matrix to eliminate interference between users.
- the use of the direction matrix can avoid interference of each coordinated base station to other terminals other than the target terminal. Zero can achieve zero total interference, which improves the degree of freedom of the base station in the number of antennas, that is, each base station needs fewer antennas to achieve better results.
- FIG. 1 is a flowchart of a method according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram of a first scenario according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of a second application scenario according to an embodiment of the present invention.
- FIG. 4 is a schematic diagram of a third application scenario according to an embodiment of the present invention.
- FIG. 5 is a schematic diagram of a fourth application scenario according to an embodiment of the present invention.
- 6 is a structural block diagram of a base station according to an embodiment of the present invention.
- FIG. 7 is a schematic diagram of a first embodiment of the direction matrix determining unit 601.
- Fig. 8 is a schematic diagram of a second embodiment of the direction matrix determining unit 601. detailed description
- Embodiments of the present invention provide a method for distributed cooperative communication, which eliminates interference between users by a method of adjacency direction matrix, and is applicable to a multi-antenna mobile terminal.
- 5101 Obtain a direction matrix corresponding to a target mobile terminal, where the number of rows of the direction matrix is determined according to a total number of mobile terminal antennas in the cooperation area and an antenna number of the target mobile terminal, where the direction matrix The number of columns is determined based on the number of code streams transmitted to the target mobile terminal.
- each cooperative base station needs zero interference to other terminals other than the target terminal to achieve zero total interference, and the degree of freedom of the base station in the number of antennas is improved. That is, each base station needs fewer antennas to achieve better results.
- each base station has data information to be transmitted to all mobile terminals and owns local channel state information (local CSI), where Si is data information transmitted to the i-th mobile terminal.
- local CSI local channel state information
- Si data information transmitted to the i-th mobile terminal.
- Each base station calculates a precoding matrix for each mobile terminal based on local channel state information.
- the local channel state information refers specifically to channel state information between the base station and all mobile terminals in the cooperative set, and the global channel state information specifically refers to channel state information between all cooperative base stations and all mobile terminals in the cooperative set.
- S201 The base station obtains a direction matrix, where the direction matrix corresponds to a mobile terminal.
- the number of rows of the direction matrix is equal to the total number of mobile terminal antennas minus the number of antennas of the mobile terminal for which precoding is performed, and the number of columns of the direction matrix is equal to the number of code streams of the mobile terminal for which precoding is performed.
- Each mobile terminal in the application for the cooperative service of the base station generates a set of direction matrices, and each set of direction matrices includes the same number of direction matrices as the number of cooperative base stations.
- Each base station will be assigned one of each set of direction matrices.
- the norm of the sum of a set of direction matrices for each mobile terminal represents the degree of interference caused by signals transmitted to the mobile terminal at other mobile terminals, and if the sum of a set of direction matrices is zero matrix, the corresponding The interference of the signals of the mobile terminal to other mobile terminals is completely eliminated.
- the norm of the matrix of the direction matrix of all the base stations corresponding to each mobile terminal may be limited to a small threshold that the system can tolerate, for example, the norm of the sum matrix (corresponding to the interference) Strength) Not greater than the noise intensity.
- the values of the specific elements may be random, and preferably may be a unit matrix or a unitary matrix that meets the requirements of the row and column.
- the norm of the sum of a set of direction matrices for a target mobile terminal is to meet the requirements to eliminate or reduce the interference.
- the total number of cooperative base stations is N
- the number of antennas of the i-th base station is M
- the number of mobile terminals is M
- the number of antennas of the j-th mobile terminal and the number of code streams of the received data are respectively ⁇ and .
- each mobile terminal has One primary base station, the other base stations are its secondary base stations (slave BS).
- the primary base station may generate a set of direction matrices for all cooperative base stations, and then send each direction matrix to the corresponding cooperative base station.
- the direction matrix is generated by itself, and for the secondary base station, the direction matrix transmitted by the primary base station is received.
- the second method is as follows: There is a dispatcher in the cooperative MIMO network, such as a dispatch controller, and all base stations in the cooperative set are controlled by the dispatch controller.
- a set of direction matrices that meet the above requirements can be generated by the dispatch controller for each mobile terminal's transmitted signal.
- Mode 3 is a distributed negotiation scheme: There are N base stations in the coordination set and the base station sequence is defined. Each cooperative base station generates a set of direction matrix for each mobile terminal in the service range of the base station according to the same method. And select the direction matrix corresponding to the base station number of its own. In this method, the direction matrix is generated for its own calculation.
- the fourth method is as follows: ⁇ There are N base stations in the cooperation set and the base station sequence is defined.
- the first base station first selects a direction matrix corresponding to each mobile terminal, and then transmits its selected direction matrix to the 2-Nth cooperative base station; the second base station selects the base based on the first base station direction matrix.
- the base station corresponds to the direction matrix of each mobile terminal and transmits it to the 3-Nth cooperative base station; and so on, all base stations obtain a direction matrix for each mobile terminal, and can satisfy the above requirements for the direction matrix .
- the above-mentioned transmission direction matrix may be directly transmitted in the form of a matrix, or may be transmitted in a manner of using a codebook index.
- the secondary base station receives the codebook index and then obtains the desired direction matrix by looking up the codebook index in the direction matrix codebook.
- Each base station obtains instantaneous local channel state information through feedback or channel estimation.
- Base station according to this The ground channel state information and the assigned direction matrix calculate a precoding matrix for the corresponding data of each mobile terminal.
- S203 Perform precoding according to a precoding matrix, and perform cooperative communication.
- Each terminal signal is multiplied by its precoding matrix and superimposed to complete precoding, and downlinked for cooperative communication.
- the manner of calculating the precoding in the embodiment of the present invention may use, but is not limited to, a method such as ZF and MMSE.
- ZF as an example to introduce several examples of calculating precoding matrices.
- the product of the channel matrix and the precoding matrix between the base station and the mobile terminal other than the target mobile terminal except the signal transmission needs to be equal to the direction matrix, in this example,
- the precoding matrices of BS1 and BS2 for x3 and x4 can be obtained.
- each base station has 4 antennas, and each mobile terminal has 2 antennas.
- Each base station has data for three mobile terminals;
- Each base station has only local channel state information.
- BS1 and BS2 Two base stations are denoted as BS1 and BS2 respectively; two mobile terminals are denoted as MS1 and MS2 respectively; xl and x2 are signals received by MS1, x3 and x4 are signals received by MS2, and x5 and x6 are MS3 connected Received signal; xl-x6 is shared by BS1 and BS2.
- BS1 has local channel state information H11, H21, and H31
- BS2 has local channel state information H12, H22, and H32.
- Global channel status information is
- the precoding matrix of BS1 and BS2 for MS2 and MS3 can be obtained by the same method.
- each base station has m antennas, there are N mobile terminals, and each mobile terminal has n antennas.
- the interference channel of the i-th cooperative base station can be expressed as H T , , H T , which is a matrix of (N1) nXm.
- the precoding matrix that the i-th base station needs to calculate is denoted by , and ⁇ is a matrix of mxn. Solving the precoding matrix requires solving the following equation:
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- Mathematical Physics (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10815002.0A EP2437419B1 (en) | 2009-09-09 | 2010-09-09 | Method and base station for cooperative communication |
BRPI1014729-2A BRPI1014729B1 (pt) | 2009-09-09 | 2010-09-09 | Método de comunicação cooperativa e estação base |
US13/316,934 US8462658B2 (en) | 2009-09-09 | 2011-12-12 | Cooperative communication method and base station |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200910190164.4 | 2009-09-09 | ||
CN2009101901644A CN102025457B (zh) | 2009-09-09 | 2009-09-09 | 协作通信的方法及基站 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/316,934 Continuation US8462658B2 (en) | 2009-09-09 | 2011-12-12 | Cooperative communication method and base station |
Publications (1)
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WO2011029400A1 true WO2011029400A1 (zh) | 2011-03-17 |
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PCT/CN2010/076761 WO2011029400A1 (zh) | 2009-09-09 | 2010-09-09 | 协作通信的方法及基站 |
Country Status (5)
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US (1) | US8462658B2 (zh) |
EP (1) | EP2437419B1 (zh) |
CN (1) | CN102025457B (zh) |
BR (1) | BRPI1014729B1 (zh) |
WO (1) | WO2011029400A1 (zh) |
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KR101800294B1 (ko) * | 2009-04-02 | 2017-12-20 | 삼성전자주식회사 | 다중 셀 통신 시스템에서 셀 가장자리 사용자의 에러를 최소화하기 위한 장치 및 방법 |
US9325401B2 (en) * | 2011-05-13 | 2016-04-26 | Fujitsu Limited | Beamforming from multiple transmission sites |
KR101903625B1 (ko) | 2012-04-26 | 2018-10-02 | 삼성전자주식회사 | 무선 통신 시스템에서 간섭 정렬을 위한 방법 및 장치 |
KR20140000847A (ko) * | 2012-06-26 | 2014-01-06 | 삼성전자주식회사 | 무선통신 시스템에서 간섭처리 방법 및 장치 |
JP6093120B2 (ja) * | 2012-07-13 | 2017-03-08 | シャープ株式会社 | 移動局装置、基地局装置及び通信方法 |
CN103634079B (zh) * | 2012-08-20 | 2017-02-08 | 上海贝尔股份有限公司 | 在无线异构通信网中优化无线链路监视窗口参数的方法 |
US9350419B2 (en) * | 2012-11-28 | 2016-05-24 | Broadcom Corporation | Coordinating transmissions of power line communication (PLC) devices |
CN103945555B (zh) * | 2013-01-21 | 2018-03-20 | 电信科学技术研究院 | 多点协作传输下的资源调度方法和设备 |
CN105101444B (zh) * | 2014-04-30 | 2018-11-20 | 华为技术有限公司 | 信号处理方法和装置、系统 |
US10110357B2 (en) * | 2016-11-03 | 2018-10-23 | Industrial Technology Research Institute | Cooperative communication method and system |
TWI633802B (zh) * | 2016-11-03 | 2018-08-21 | 財團法人工業技術研究院 | 合作通訊方法及系統 |
CN107979878B (zh) * | 2017-10-11 | 2019-08-23 | 捷开通讯(深圳)有限公司 | 一种通信方法及基站 |
CN109977514B (zh) * | 2019-03-19 | 2021-02-09 | 电子科技大学 | 一种雷达同步数据流图模型调度序列生成方法 |
CN113872650B (zh) * | 2021-09-28 | 2022-11-29 | 京信网络系统股份有限公司 | 无线通信方法、装置、设备、系统和存储介质 |
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2010
- 2010-09-09 BR BRPI1014729-2A patent/BRPI1014729B1/pt active IP Right Grant
- 2010-09-09 WO PCT/CN2010/076761 patent/WO2011029400A1/zh active Application Filing
- 2010-09-09 EP EP10815002.0A patent/EP2437419B1/en active Active
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2011
- 2011-12-12 US US13/316,934 patent/US8462658B2/en active Active
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Also Published As
Publication number | Publication date |
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CN102025457B (zh) | 2013-04-17 |
BRPI1014729B1 (pt) | 2021-01-26 |
US8462658B2 (en) | 2013-06-11 |
BRPI1014729A2 (pt) | 2016-04-12 |
EP2437419A1 (en) | 2012-04-04 |
CN102025457A (zh) | 2011-04-20 |
US20120082118A1 (en) | 2012-04-05 |
EP2437419B1 (en) | 2014-06-18 |
EP2437419A4 (en) | 2012-04-18 |
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