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WO2011020214A1 - Procédé de transmission multipoint coordonnée et appareil correspondant - Google Patents

Procédé de transmission multipoint coordonnée et appareil correspondant Download PDF

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Publication number
WO2011020214A1
WO2011020214A1 PCT/CN2009/000945 CN2009000945W WO2011020214A1 WO 2011020214 A1 WO2011020214 A1 WO 2011020214A1 CN 2009000945 W CN2009000945 W CN 2009000945W WO 2011020214 A1 WO2011020214 A1 WO 2011020214A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel
base station
precoding matrix
base stations
comp
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2009/000945
Other languages
English (en)
Chinese (zh)
Inventor
孙欢
尤明礼
孙芳蕾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Shanghai Bell Co Ltd
Alcatel Lucent SAS
Original Assignee
Alcatel Lucent Shanghai Bell Co Ltd
Alcatel Lucent SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alcatel Lucent Shanghai Bell Co Ltd, Alcatel Lucent SAS filed Critical Alcatel Lucent Shanghai Bell Co Ltd
Priority to CN200980159022XA priority Critical patent/CN102415120B/zh
Priority to PCT/CN2009/000945 priority patent/WO2011020214A1/fr
Publication of WO2011020214A1 publication Critical patent/WO2011020214A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/005—Interference mitigation or co-ordination of intercell interference
    • H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
    • 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
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end

Definitions

  • Embodiments of the present invention relate to wireless communication technologies and, more particularly, to a method of implementing coordinated multipoint transmission and apparatus therefor. Background technique
  • CoMP Coordinated Multicast and Receive
  • JP joint processing
  • CS/CB cooperative scheduling/beamforming
  • TDD time division multiple access
  • UE non-coherent local precoding target user
  • S-RS uplink sounding reference signal
  • the involved eNB For uncorrelated transmission in TDD downlink (DL) CoMP, the involved eNB transmits the same data stream to the intended UE called CoMP UE, and then non-coherently combines the signals received at the CoMP UE, which This makes the performance of the system worse than coherent transmission.
  • CoMP UE For uncorrelated transmission in TDD downlink (DL) CoMP, the involved eNB transmits the same data stream to the intended UE called CoMP UE, and then non-coherently combines the signals received at the CoMP UE, which This makes the performance of the system worse than coherent transmission.
  • each eNB is equipped with M antennas, and the UE is equipped with N antennas.
  • MMO Multiple Input Multiple Output
  • all eNBs simultaneously transmit the same data to the CoMP UE.
  • Each eNB has an equal total transmit power!> and employs an average power allocation in the data stream of each eNB.
  • eNB A is the base station to which the user CoMP UE belongs, which is denoted as the first eNB
  • eNB B is the cooperative base station, which is denoted as the second eNB.
  • each eNB For its transmitted signal, each eNB independently designs its own precoder based on singular value (SVD) decomposition using the feature vector as its optimal precoder. This approach is optimal for precoder designs in SU-MIMO.
  • SVD singular value
  • the right-hand matrix after SVD decomposition of the user channel is used for the precoder design at each eNB, and the received signals on the CoMP UE side will be non-coherently combined. This is because in SVD decomposition, it is difficult to perform pre-phase adjustment at each eNB to implement CoMP.
  • Coherent reception on the UE side The signal received by the CoMP UE side is -
  • VN J where 1! is the noise received by the CoMP UE, is the signal transmitted by ⁇ 8, ⁇ ,, and H l2 represent the channels of eNB A and eNB B to the CoMP UE, respectively, ⁇ , and ⁇ 12 are eNB A, respectively.
  • the feature vector used by the eNB B to perform precoding from the SVD decomposition where N is the total number of data streams transmitted from the eNB to the CoMP UE. In CoMP, the total number of data streams transmitted by each eNB to the CoMP UE is N.
  • the equivalent channels fi and fi, 2 from eNB A and eNB B to the CoMP UE, respectively, are random matrices, and it is difficult to perform pre-phase adjustment for these random matrices. Therefore, the combination will produce the following result, at a time fi, The addition of 5 and 2 can bring benefits to the performance of the CoMP UE, and at another moment, the addition can deteriorate the performance of the CoMP UE. Therefore, in the TDD DL CoMP, the precoder scheme can only obtain a limited channel. Gain enhancement.
  • Embodiments of the present invention propose a coordinated multipoint transmission method and apparatus therefor.
  • a coordinated multipoint transmission method comprises: independently generating, at each of more than one base station, a precoding matrix capable of phase preconditioning with respect to a channel; each of the more than one base station using the precoding matrix pair to be transmitted to a mobile terminal (UE) The same signal is precoded and the encoded signal is transmitted to the UE; the UE combines the encoded signals received from each of the more than one base station.
  • a base station including a precoding matrix generating unit for generating a precoding matrix capable of phase preconditioning with respect to a channel, independent of other base stations involved in coordinated multipoint transmission.
  • a precoding unit configured to precode the signal to be sent to the UE by using a precoding matrix generated by the precoding matrix generating unit, and a sending unit, configured to send the precoded signal to the UE.
  • a mobile terminal including a receiving unit, configured to receive signals from a plurality of base stations, and signals received from each of the plurality of base stations are respectively related to multiple Each of the base stations is phase pre-adjusted with a channel between the UEs; a combining unit is configured to combine the encoded signals received from each of the more than one base stations.
  • a communication system is provided, including the base station and the mobile terminal described above.
  • an advantage of the embodiment of the present invention is that: since the signal is phase pre-adjusted with respect to the channel between the base station and the UE before transmission, high performance can be obtained without special operations at the UE. High gain reception. DRAWINGS
  • FIG. 2 shows a block diagram of a base station in accordance with an embodiment of the present invention
  • Figure 3 shows a block diagram of a UE in accordance with an embodiment of the present invention
  • FIG. 4 shows a flow chart of a transmission method in accordance with an embodiment of the present invention
  • FIG. 5 is a schematic view showing the performance of an embodiment of the present invention.
  • a system for implementing coordinated multipoint transmission is proposed. As shown in Fig. 1, the system includes a base station and a mobile terminal (UE) as described below.
  • UE mobile terminal
  • a base station is also provided, as shown in FIG. 2, including a precoding matrix generating unit 230 for generating a precoding matrix capable of phase preconditioning with respect to a channel independently of other base stations involved in coordinated multipoint transmission;
  • the encoding unit 240 is configured to precode the signal to be sent to the UE by using a precoding matrix generated by the precoding matrix generating unit, and the sending unit 250 is configured to send the precoded signal to the UE.
  • the base station further includes a decomposing unit 220 for decomposing a channel between the base station and the UE.
  • the precoding matrix generating unit 230 is further configured to generate a precoding matrix capable of pre-adjusting the phase of the channel according to the decomposition of the channel.
  • the base station further includes a channel estimation unit 210 for estimating a channel between the base station and the mobile terminal (UE) for channelization by the decomposition unit 220.
  • a channel estimation unit 210 for estimating a channel between the base station and the mobile terminal (UE) for channelization by the decomposition unit 220.
  • the base station also includes a buffer 260 for buffering signals to be precoded by the precoding unit 240.
  • a mobile terminal (UE) is also proposed. As shown in FIG. 3, the mobile terminal includes a receiving unit 310, configured to receive signals from a plurality of base stations, and the signals received from each of the plurality of base stations are respectively Each of the base stations is phase pre-adjusted with a channel between the UEs; a combining unit 320 is configured to combine the signals received by the receiving unit 310 from each of the plurality of base stations to generate a signal that can be sent to subsequent baseband processing The signal that unit 330 is processing.
  • each of the components shown in FIGS. 2 to 4 can be implemented by a plurality of devices in practical applications, and multiple components are shown. It can also be integrated in a chip or a device in practical applications.
  • the base station and UE may also include any unit and device for other purposes.
  • step S510 the channel model is decomposed.
  • FIG. 1 shows a schematic diagram of a system in accordance with an embodiment of the present invention.
  • eNB A initiates a CoMP request and transmits CoMP request and data to be transmitted to the CoMP UE (ie UE A in FIG. 1) to eNB B to request eNB B to participate in CoMP.
  • CoMP UE ie UE A in FIG. 1
  • eNB B ie UE A in FIG. 1
  • eNB B ie UE A in FIG. 1
  • eNB B ie UE A in FIG. 1
  • eNB B In non-correlated transmissions, there is no channel state information (CSI) exchange between eNBs, and each eNB can only design the precoder using information of its direct channel (from the eNB to the CoMP UE).
  • CSI channel state information
  • eNB A can only design the precoder independently using the CSI of the channel (1 (in the embodiment of the present invention, ie, the precoding matrix W soup), and the eNB B can only use the channel independently.
  • the CSI of H 12 is used to design a precoder (in the embodiment of the invention, ie precoding matrix W 12 ).
  • the channel ⁇ , and the channel H l2 can be obtained by the channel estimation unit 210 of the eNB A and the eNB B, respectively, by processing the pilot signal. Taking the construction W as an example.
  • the decomposition unit '220 of the eNB A first decomposes the channel H 12 using QR factorization:
  • rff represents the equivalent channel gain of the first data stream from the first eNB to the CoMP UE, representing the equivalent channel gain of the Nth data stream from the first eNB to the CoMP UE, and so on.
  • Superscript A value indicating the item is associated with the channel of the first eNB.
  • Q gentle is a unitary matrix or a semi-definite matrix, which can be derived from Equation 1.
  • step 520 a precoding matrix capable of pre-adjusting the phase of the channel is generated.
  • the precoding matrix generating unit 230 in the eNB A generates the following precoding matrix using Q obtained in the equation (1):
  • ( ⁇ is a conjugate transposed matrix of ( ⁇ admir, which matches the channel between 61 ⁇ 8 and 0 ⁇ ?1 ⁇
  • F u is a diagonal matrix for phase pre-adjustment, which can be represented for:
  • the precoding matrix generating unit 230 of the eNB B can obtain the precoding matrix at the second eNB:
  • H I2 R 12 Q 12 (6) and F I2 can be expressed as
  • r 2 represents the equivalent channel gain of the first data stream from the second eNB to the CoMP UE
  • ri3 ⁇ 4 represents the equivalent channel gain of the Nth data stream from the second eNB to the CoMP UE
  • the superscript indicating The value of this item is associated with the channel of the second eNB, (r 2 ) ) 'is a common to r 2 ), is the modulus of ⁇ , and so on.
  • the signal is precoded using the obtained precoding matrix and transmitted to the corresponding CoMP UE.
  • the precoding unit 240 in the eNB A and the eNB B respectively weights the data x to be transmitted (for example, data that is previously stored in the buffer 260) using a precoding matrix to implement precoding, and sends it to the transmitting unit 250 through the transmitting unit 250.
  • step 540 the corresponding CoMP UE receives signals from eNB A and eNB B, and in step 550, combines the received signals.
  • the baseband processing unit 530 performs subsequent processing on the combined signals.
  • the merged unit 320 of the CoMP UE combines the signals received by the receiving unit 310 into the following expression:
  • ⁇ is an additive white Gaussian noise with a UE side covariance matrix offord 2 1 .
  • a received signal represented by the equivalent channel H of the eNB A and the eNB B to the CoMP UE can be obtained.
  • the technical solution provided by the embodiment of the present invention implements coherent reception on the CoMP UE side. Meanwhile, since the equivalent channel H is a lower triangular matrix, a sequential interference cancellation (SIC) receiver can be naturally used on the CoMP UE side,
  • SIC sequential interference cancellation
  • Figure 5 shows a comparison of the performance of the solution provided by embodiments of the present invention with prior art solutions under the same conditions.
  • the conditions for the simulation are: two eNBs, each having four antennas, the UE having two antennas, transmitting the same data and the channel between the eNB and the UE is a Rayleigh channel, ignoring path loss and shadowing effects.
  • SNR ⁇ .
  • the solution provided by the embodiments of the present invention has a throughput advantage of around lbps/Hz compared to the ⁇ " scheme, and this advantage is greater as the signal-to-noise ratio increases.
  • some embodiments also include a machine readable or computer readable program storage device (eg, a digital data storage medium) and encoding machine executable or computer executable program instructions, wherein the instructions perform some of the above methods or All steps.
  • the program storage device can be a digital memory, a magnetic storage medium (such as a magnetic disk and a magnetic tape), a hardware or an optically readable digital data storage medium.
  • Embodiments also include a programming computer that performs the steps of the above method.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention se rapporte à un procédé de transmission multipoint coordonnée (CoMP) et à un appareil correspondant. Le procédé comprend les étapes suivantes : à chacune de la pluralité de stations de base, une matrice de précodage, qui peut être utilisée pour exécuter un pré-ajustement de phase relatif au canal, est générée de façon indépendante; chacune de la pluralité de stations de base utilise la matrice de précodage pour précoder les mêmes signaux qui doivent être envoyés à l'équipement d'utilisateur (EU), et elle transmet des signaux codés à l'EU. L'EU combine les signaux codés reçus de chacune de la pluralité de stations de base. Grâce à la solution technique susmentionnée de l'invention, une transmission CoMP peut être réalisée avec un excellent rendement et avec un excellent gain.
PCT/CN2009/000945 2009-08-18 2009-08-18 Procédé de transmission multipoint coordonnée et appareil correspondant Ceased WO2011020214A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200980159022XA CN102415120B (zh) 2009-08-18 2009-08-18 协同多点传输方法及其设备
PCT/CN2009/000945 WO2011020214A1 (fr) 2009-08-18 2009-08-18 Procédé de transmission multipoint coordonnée et appareil correspondant

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Application Number Priority Date Filing Date Title
PCT/CN2009/000945 WO2011020214A1 (fr) 2009-08-18 2009-08-18 Procédé de transmission multipoint coordonnée et appareil correspondant

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013033919A1 (fr) * 2011-09-09 2013-03-14 富士通株式会社 Procédé et système de transmission de données, émetteur et récepteur
CN103718491A (zh) * 2011-09-19 2014-04-09 富士通株式会社 数据传输方法、系统、发射机和接收机
WO2015149300A1 (fr) * 2014-04-02 2015-10-08 上海贝尔股份有限公司 Procédé et dispositif de transmission conjointe cohérente en liaison descendante multi-cellules de faible complexité
EP3763051A1 (fr) * 2018-03-07 2021-01-13 QUALCOMM Incorporated Détermination d'ensemble de grappes pour comp sur la base de la fiabilité et du budget de retard dans urllc

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN1773885A (zh) * 2004-11-09 2006-05-17 三星电子株式会社 在多天线宽带无线接入系统中支持各种多天线方案的方法
CN101282564A (zh) * 2007-04-05 2008-10-08 大唐移动通信设备有限公司 一种时分双工系统中估计信道质量指示的方法及终端
WO2009084903A2 (fr) * 2007-12-31 2009-07-09 Lg Electronics Inc. Procédé servant à transmettre un signal précodé dans un système de communication collaboratif multi-entrées multi-sorties

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1773885A (zh) * 2004-11-09 2006-05-17 三星电子株式会社 在多天线宽带无线接入系统中支持各种多天线方案的方法
CN101282564A (zh) * 2007-04-05 2008-10-08 大唐移动通信设备有限公司 一种时分双工系统中估计信道质量指示的方法及终端
WO2009084903A2 (fr) * 2007-12-31 2009-07-09 Lg Electronics Inc. Procédé servant à transmettre un signal précodé dans un système de communication collaboratif multi-entrées multi-sorties

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013033919A1 (fr) * 2011-09-09 2013-03-14 富士通株式会社 Procédé et système de transmission de données, émetteur et récepteur
CN103718584A (zh) * 2011-09-09 2014-04-09 富士通株式会社 数据传输方法、系统、发射机和接收机
US9344160B2 (en) 2011-09-09 2016-05-17 Fujitsu Limited Data transmission method and system, transmitter, and receiver
CN103718491A (zh) * 2011-09-19 2014-04-09 富士通株式会社 数据传输方法、系统、发射机和接收机
CN103718491B (zh) * 2011-09-19 2016-09-21 富士通株式会社 数据传输方法、系统、发射机和接收机
WO2015149300A1 (fr) * 2014-04-02 2015-10-08 上海贝尔股份有限公司 Procédé et dispositif de transmission conjointe cohérente en liaison descendante multi-cellules de faible complexité
EP3763051A1 (fr) * 2018-03-07 2021-01-13 QUALCOMM Incorporated Détermination d'ensemble de grappes pour comp sur la base de la fiabilité et du budget de retard dans urllc
EP3763051B1 (fr) * 2018-03-07 2025-09-03 QUALCOMM Incorporated Détermination d'un ensemble d'amas pour comp en fonction de la fiabilité et du bilan de délais pour urllc

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CN102415120A (zh) 2012-04-11
CN102415120B (zh) 2013-11-27

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