WO2014107888A1 - Procédé de transmission et station de base pour des entrées multiples sorties multiples en liaison descendante - Google Patents

Procédé de transmission et station de base pour des entrées multiples sorties multiples en liaison descendante Download PDF

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Publication number
WO2014107888A1
WO2014107888A1 PCT/CN2013/070381 CN2013070381W WO2014107888A1 WO 2014107888 A1 WO2014107888 A1 WO 2014107888A1 CN 2013070381 W CN2013070381 W CN 2013070381W WO 2014107888 A1 WO2014107888 A1 WO 2014107888A1
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WIPO (PCT)
Prior art keywords
user equipment
mode
user
matrix
precoding
Prior art date
Application number
PCT/CN2013/070381
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English (en)
Chinese (zh)
Inventor
杨敬
马霓
蒋培刚
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华为技术有限公司
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Priority to CN201380001027.6A priority Critical patent/CN104185956B/zh
Priority to PCT/CN2013/070381 priority patent/WO2014107888A1/fr
Publication of WO2014107888A1 publication Critical patent/WO2014107888A1/fr

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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
    • H04B7/04—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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • 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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Definitions

  • the present invention relates to the field of communications, and in particular, to a downlink multiple input multiple output transmission method and apparatus. Background technique
  • Multi-User Multiple Input-Multiple-Output is a spatial freedom that utilizes multi-user channels to multiplex multiple downlink user data into the same time-frequency domain resource.
  • SDMA Division Division Multiple Access
  • MU-MIMO In order to improve network performance, the implementation process of MU-MIMO related technology is introduced in each protocol version in the Long Term Evolution Frequency Division Duplexing (LTE FDD) system.
  • LTE protocol version 8 MU-MIMO is implemented by Transmission Mode (TM5) and Downlink Control Information (DCI) 1C signaling format.
  • TM5 mode is used in a cell-specific reference signals (CRS) and a pre-coded mode for beamforming weights on the user
  • the DCI 1D carries 1 bit of power offset information for Power allocation at the time of pairing.
  • TM9 MIMO mode and DCI Format 2C format for MU-MIMO characteristics support.
  • DMRS Demodulation Reference Signal
  • MU-MIMO multi-user multiple input multiple output
  • SU-MIMO single user multiple input
  • DMRS Demodulation Reference Signal
  • the user equipment can only use the pre-coding matrix indicator (PMI) of the existing orthogonal RANK1 for multi-user (MU) pairing, but the PMI of RANK1 is orthogonal to each other.
  • the ratio is lower.
  • the DMRS scrambling code is not orthogonal after the number of pairing layers exceeds 2, which affects the channel estimation accuracy of the DMRS channel. Therefore, how to implement the paired transmission of the user equipment in the two modes of TM9 and TM5 in the case of being transparent to the user equipment is a technical problem to be solved by the present invention. Summary of the invention
  • a downlink MIMO transmission method and apparatus provided by the embodiments of the present invention are provided to solve the problem of pairing user equipments in different MIMO modes.
  • an embodiment of the present invention provides a downlink MIMO transmission method, where the method includes:
  • the first mode is a transmission mode 5 TM5 mode of the LTE system
  • the second mode is a single layer transmission mode of the LTE system.
  • the first mode is a transmission mode 5TM5 mode of the LTE system
  • the second mode is a dual layer transmission mode 9 TM9 RANK2 of the LTE system.
  • the second user equipment performs beamforming weight adjustment to implement precoding of the second user equipment and the first user equipment.
  • the matrix indicates information orthogonalization, and performs power adjustment on the second user equipment to meet the total power constraint of the first user equipment and the second user equipment after the pairing, and further includes:
  • the power of the first user equipment is set to 0 at a corresponding frequency domain resource unit location of the port of the pilot signal.
  • the fourth possible implementation manner is further provided, where the weight adjustment is performed on the second user equipment to implement the second user equipment and the In the orthogonalization of the precoding matrix indication information of the first user equipment, the weight adjustment method of the second user equipment is specifically: where w. . a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the TM5 mode, W1 . a precoding weight matrix corresponding to the PMI index fed back by the second user equipment in the TM9 mode.
  • the corrected precoding weight matrix of the second user equipment it is a conjugate transposed matrix of w ⁇ .
  • the fifth possible implementation manner is further provided, where the second user equipment is power adjusted to meet the first use after the pairing.
  • the total power constraint of the user equipment and the second user equipment is specifically: the MU power adjusted weight matrix of the first user equipment is the MU power adjusted weight matrix of the second user equipment:
  • a sixth possible implementation manner is further provided, where the weight adjustment is performed on the second user equipment, to implement the second user equipment and the In the orthogonalization of the precoding matrix indication information of a user equipment, the weight adjustment method of the second user equipment is specifically:
  • w. . a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the TM5 mode, and a precoding matrix weight corresponding to the RANK2 PMI index fed back by the second user equipment in the TM9 mode.
  • the precoding weight matrix of the modified second user equipment which is a conjugate transposed matrix of W , is ⁇ . Conjugate transposed matrix.
  • a seventh possible implementation manner is further provided, where the second user equipment is power-adjusted to meet the first user equipment and the The total power constraint of the second user equipment is specifically: the MM power adjusted weight matrix of the first user equipment is: 2 the MU power adjusted weight matrix of the second user equipment is:
  • the woo is a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the ⁇ mode, and w “the precoding matrix weight corresponding to the RANK2 PMI index fed back by the second user equipment in the TM9 mode.
  • denotes a pair.
  • the vector finds a 2-norm, and I JI denotes a 2-norm of the vector.
  • an embodiment of the present invention provides a base station, where the base station includes:
  • a determining module receiving precoding matrix indication information sent by at least two user equipments, and determining, according to the MU-MIMO pairing criterion, that the at least two user equipments are in a pairing state;
  • a first adjustment module configured to allocate, according to the precoding matrix indication information PMI sent by the first user equipment of the at least two user equipments, the first user equipment to the transmission data on the physical downlink shared channel PDSCH of the first user equipment a beamforming weight and a pairing power adjustment, where the first user equipment is in a first mode in a long term evolution LTE transmission mode;
  • the second adjustment module performs beamforming weight adjustment on the second user equipment in the second mode in the LTE transmission mode of the at least two user equipments, so that the second user equipment and the first user
  • the precoding matrix of the device indicates orthogonal information, and performs power adjustment on the second user equipment to meet the total power constraint of the first user equipment and the second user equipment after pairing.
  • the first mode is an LTE system transmission mode 5TM5 mode
  • the second mode is an LTE system single layer transmission mode. 9 TM9 RANKL
  • the first mode is an LTE system transmission mode 5 TM5 mode
  • the second mode is an LTE system dual layer transmission mode 9 TM9 RANK2.
  • the third adjustment module is further configured to perform weight adjustment on the second user equipment by the second adjustment module, to implement the second user.
  • the device is orthogonalized with the precoding matrix indication information of the first user equipment, and the second After the user equipment performs power adjustment to meet the total power constraint of the first user equipment and the second user equipment after the pairing,
  • the power of the first user equipment is set to 0 at a corresponding frequency domain resource unit location of the port of the demodulation pilot signal.
  • a fourth possible implementation manner is further provided, where the second adjustment module adjusts the weight of the second user equipment by:
  • w. . a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the TM5 mode
  • W1 . a precoding weight matrix corresponding to the PMI index fed back by the second user equipment in the TM9 mode.
  • the corrected precoding weight matrix of the second user equipment it is a conjugate transposed matrix of w ⁇ .
  • a fifth possible implementation manner is further provided, where the second adjustment module performs power adjustment on the second user equipment to meet the pairing manner.
  • the total power constraint of the first user equipment and the second user equipment: the MU power adjusted weight matrix of the first user equipment is: . ⁇ w. .
  • a sixth possible implementation manner is further provided, where the second adjustment module performs weight adjustment on the second user equipment to implement the foregoing Orthogonalizing the precoding matrix indication information of the second user equipment and the first user equipment
  • the weight adjustment of the second user equipment :
  • the woo is a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the ⁇ mode, and w “the precoding matrix weight corresponding to the RANK2 PMI index fed back by the second user equipment in the TM9 mode.
  • the value, and the matrix of the precoding weights of the modified second user equipment, the conjugate transposed matrix of w ⁇ is the conjugate transposed matrix of ⁇ .
  • a seventh possible implementation manner is further provided, where the second adjustment module performs power adjustment on the second user equipment to meet the pairing manner.
  • the woo is a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the ⁇ mode
  • ⁇ is a precoding matrix weight corresponding to the RANK2 PMI index fed back by the second user equipment in the TM9 mode.
  • means right.
  • the vector finds the 2-norm,
  • an embodiment of the present invention provides a base station, where the base station includes a receiver and a processor;
  • the receiver is configured to receive precoding matrix indication information sent by at least two user equipments;
  • the processor is configured to determine, according to the multi-user multiple input multiple output pairing criterion, that the at least two user equipments are in a pairing state, and send according to the first user equipment of the at least two user equipments.
  • the second user equipment in the second mode of the LTE transmission mode performs beamforming weight adjustment, so that the second user equipment is orthogonal to the precoding matrix weight of the first user equipment, and the second The user equipment performs power adjustment to meet the total power constraint of the first user equipment and the second user equipment after pairing.
  • the downlink MIMO transmission method determines that the first user equipment is in a pairing state by using precoding matrix indication information sent by the first user equipment in the first MU mode, and then the first user equipment performs corresponding data.
  • Beamforming and pairing power adjustment determining that the second user equipment is in a pairing state and beamforming the second user equipment according to the demodulation pilot signal DMRS sent by the second user equipment in the second MU mode a weight adjustment and a power adjustment to orthogonalize the precoding matrix weights of the second user equipment and the first user equipment, and satisfy the total of the first user equipment and the second user equipment after pairing Power constraint, so as to achieve the pairing problem of user equipment in different MIMO modes.
  • FIG. 1 is a flowchart of an embodiment of a downlink MIMO transmission method according to an embodiment of the present invention
  • FIG. 2 is a structural diagram of a base station according to an embodiment of the present invention
  • FIG. 3 is a structural diagram of another embodiment of a base station according to an embodiment of the present invention. detailed description
  • the TM5 mode introduced in the LTE R8 protocol can support the MU-MIMO feature. It performs 7-carrier MU-MIMO weight based on CRS and PMI. Therefore, in order to obtain better MU-MIMO gain, orthogonal codebook-based pairing is suitable. The way to deal with it.
  • TM5 mode the main process of MU-MIMO pairing is as follows:
  • the base station determines whether the UE needs to be paired based on the existing pairing criterion.
  • the pairing criterion may be, for example, a base station, and receives a RANK1 PMI fed back by the UE in the TM5 mode, and then according to whether the codebook is orthogonal and the estimated pairing is performed.
  • the subsequent MU-MIMO spectral efficiency comprehensively determines whether the UE needs to perform MU-MIMO pairing, and the pairing criterion is an existing rule, and is not explained much.
  • the base station decides that the UE needs to perform MU-MIMO pairing, the base station sets the power offset value in the DCI 1D to 0, and the data channel power of the UE is halved;
  • the base station decides that the UE does not need to perform MU-MIMO pairing, the DCI 1D power is configured to be 1, and the data channel power of the UE is unchanged;
  • the base station Regardless of whether the base station decides whether the UE needs to perform MU-MIMO pairing, the base station indicates the PMI used by the current UE's data channel to the UE in the DCI ID.
  • this mode can only use the existing orthogonal RANK1 PMI for MU pairing; however, the RANK1 PMI has a low ratio of two orthogonals, only 25%, so the pairing is greatly limited by the codebook.
  • the TM9 mode introduced by the R10 protocol can also support the MU-MIMO feature.
  • the TM9 MIMO mode feature it is based on DMRS for MU-MIMO weight and user data power.
  • the base station when the MU-MIMO pairing is performed in the TM9 mode, the base station can be constrained by whether the PMI matrix or the matrix is orthogonal, and the base station can obtain a more suitable transmission weight by an appropriate beamforming weight algorithm scheme.
  • FIG. 1 is a flowchart of a downlink MIMO transmission method provided by this embodiment, where the method may include:
  • S101 Receive precoding matrix indication information sent by at least two user equipments, and according to The MU-MIMO pairing criterion determines that the at least two user equipments are in a pairing state; at least two of the user equipments may be in different modes, for example, the first user equipment is in the first mode, and the second user equipment is in the second mode.
  • the first mode may be the TM5 MIMO mode in the LTE system R8 protocol, or the TM4, TM6 mode. These transmission modes are based on CRS and PMI for MU-MIMO weight bearing mode.
  • the base station receives the RANK1 PMI fed back by the UE in the TM5 mode, and then comprehensively determines whether the UE needs to perform MU-MIMO pairing according to whether the codebook is orthogonal and the estimated paired MU-MIMO spectrum efficiency.
  • the MU-MIMO pairing criterion may refer to the existing MU-MIMO pairing criterion.
  • the rule for example, may be a base station, and receives the RANK1 PMI fed back by the UE in the TM5 mode, and then comprehensively determines whether the UE needs to perform MU-MIMO pairing according to whether the codebook is orthogonal and the estimated paired MU-MIMO spectrum efficiency.
  • the base station decides that the UE performs MU-MIMO pairing, the power offset value in the DCI 1D is set to 0, and the UE data channel power is halved; if the base station decides that the UE does not perform MU-MIMO pairing, the power in the DCI 1D is configured as 1 .
  • the UE data channel power is unchanged.
  • the default is to determine that the first user equipment UE0 in the first mode performs MU-MIMO pairing.
  • the second mode may be the TM9 RANK1/RANK2 mode in the R10 protocol.
  • the second mode may be a mode of carrying MU-MIMO weights and user data power based on DMRS.
  • the base station can obtain a more suitable transmission weight by an appropriate beamforming weight algorithm scheme without being constrained by whether the PMI matrix or the matrix is orthogonal. Also in order to enable the user equipments in the two modes to be paired, it is determined by default that the second user equipment UE1 in the second mode also needs to perform MU-MIMO pairing.
  • Transmission data on PDSCH Beamforming and pairing power adjustment;
  • the base station sets the power offset value to 0 in DCI 1D to achieve the purpose of power halving and data beam shaping weight adjustment.
  • the base station may adjust the weight of the second user equipment UE1 to implement orthogonalization of the precoding matrix indication information of the second user equipment and the first user equipment to avoid interference.
  • the data is adjusted in power so that the base station's transmit power is not greater than the total power of the base station.
  • the UEO data power may be set to 0 in the MFRS port corresponding to the resource element (Resource Element, RE) to achieve mutual interference in the frequency domain, and the uplink physical channel is used for uplink transmission.
  • the smallest resource unit is called a resource element.
  • paired transmission of MU-MIMO and orthogonalization of pilots can be implemented under the premise of being transparent to the UE.
  • the first mode is a TM5 mode
  • the second mode is a TM9 RANK1 mode
  • the weight of the second user equipment can be adjusted as follows: where w. . a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the TM5 mode, and w 1Q is a precoding weight matrix corresponding to the PMI index fed back by the second user equipment in the TM9 mode.
  • the corrected precoding weight matrix of the first user equipment is a conjugate transposed matrix of w 00 .
  • the second user equipment may be power-adjusted to meet the first user setting after the pairing.
  • w. . a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the TM5 mode
  • W1 . a precoding weight matrix corresponding to the PMI index fed back by the second user equipment in the TM9 mode.
  • the conjugate transposed matrix of w ⁇ , 1 ⁇ . 1 means right.
  • the vector finds the 2-norm (also called the Frobenius norm) to reach ⁇ . The purpose of normalization.
  • the first mode may be a TM5 mode and the second mode may be a TM9 RANK2 mode.
  • the second user equipment may be weighted to implement the second user equipment and the first user equipment.
  • Precoding matrix indicates information orthogonalization: where woo is a precoding weight matrix corresponding to a PMI index fed back by the first user equipment in the ⁇ mode, and w "is a second user equipment feedback in the TM9 mode.
  • the second user equipment may be power-adjusted in the following manner to meet the paired user equipment and the second user.
  • the total power constraint of the device is specifically as follows:
  • woo the precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the ⁇ mode
  • ⁇ is a precoding matrix weight corresponding to the RANK2 PMI index fed back by the second user equipment in the TM9 mode.
  • the embodiment of the present invention further provides a base station, and the structure thereof is as shown in FIG. 2, the base station may be an enodeB, and the base station may include:
  • the determining module 201 is configured to receive precoding matrix indication information sent by at least two user equipments in different modes, and determine, according to the MU-MIMO pairing criterion, that the at least two first user equipments are in a pairing state;
  • the first adjustment module 202 performs the transmission on the physical downlink shared channel PDSCH allocated by the first user equipment to the first user equipment. a beamforming weight and a pairing power adjustment of the data, where the first user equipment is in a first mode in a long term evolution LTE transmission mode;
  • the second adjustment module 203 performs beam shaping weight adjustment on the second user equipment in the second mode in the LTE transmission mode of the at least two user equipments, so that the second user equipment and the first
  • the precoding matrix indication information of the user equipment is orthogonal, and power adjustment is performed on the second user equipment to meet the total power constraint of the first user equipment and the second user equipment after pairing.
  • the base station may further include the third adjustment module 204 performing weight adjustment on the second user equipment to implement the second user equipment and the first user.
  • the precoding matrix of the device indicates information orthogonalization, and performs power adjustment on the second user equipment to meet the total power constraint of the first user equipment and the second user equipment after pairing, and further Includes:
  • the power of the first user equipment is set to 0 at a corresponding frequency domain resource unit location of the port of the demodulation pilot signal.
  • the first mode is a TM5 mode of a Long Term Evolution (LTE) system
  • the second mode is a TM9 RANK1 mode of an LTE system.
  • the second adjustment module 203 performs weight adjustment on the second user equipment to implement orthogonalization of precoding matrix indication information of the second user equipment and the first user equipment, where the second user
  • the weight adjustment method of the device is specifically as follows: where, w. . a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the TM5 mode, and w1O is a precoding weight matrix corresponding to the PMI index fed back by the second user equipment in the TM9 mode, which is a modified
  • the precoding weight matrix of the second user equipment is a conjugate transposed matrix of w ⁇ .
  • the second adjustment module 203 performs power adjustment on the second user equipment to meet the total power constraint of the first user equipment and the second user equipment after the pairing is specifically as follows:
  • the MU power adjusted weight matrix is:
  • the MU power adjusted weight matrix of the second user equipment is: 1Q 2 1 .
  • the first mode is a TM5 mode of an LTE system
  • the second mode is a TM9 RANK2 mode of an LTE system.
  • the second adjustment module 203 performs weight adjustment on the second user equipment to implement orthogonalization of precoding matrix indication information of the second user equipment and the first user equipment, where the second user
  • the weight adjustment method of the device is specifically as follows:
  • the wOO is a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the TM5 mode
  • ⁇ is a precoding matrix weight corresponding to the RANK2PMI index fed back by the second user equipment in the TM9 mode, .
  • a matrix of precoding weights for the modified second user equipment is specifically as follows:
  • the wOO is a precoding weight matrix corresponding to the PMI index fed back by the first user equipment in the TM5 mode
  • ⁇ is a precoding matrix weight corresponding to the RANK2PMI index fed back by the second user equipment in the TM9 mode, .
  • a matrix of precoding weights for the modified second user equipment is specifically as follows:
  • the wOO is a precoding weight matrix
  • the power adjustment is performed on the second user equipment to meet the total power constraint of the first user equipment and the second user equipment after the pairing is specifically:
  • the MU power adjusted weight matrix of the second user equipment is: 2 ll Wi . Ll ,
  • FIG. 3 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • the base station can include a receiver 31 and a processor 34.
  • the base station may also include a common component such as an antenna, a baseband processing component, a medium-frequency processing component, and an input/output device.
  • the embodiment of the present invention is not limited herein.
  • the receiver 31 is configured to receive precoding matrix indication information sent by at least two user equipments;
  • the processor 34 is configured to determine, according to the multi-user multiple input multiple output pairing criterion, that the at least two user equipments are in a pairing state, according to the precoding matrix indication information sent by the first user equipment of the at least two user equipments.
  • the second user equipment of the second mode performs beamforming weight adjustment, so that the second user equipment and the first
  • the precoding matrix weights of the user equipment are orthogonal, and the second user equipment is power adjusted to meet the total power constraint of the first user equipment and the second user equipment after pairing.
  • the base station shown in FIG. 3 is similar to the foregoing embodiment in any of the methods provided in the foregoing method embodiments, and details are not described herein again.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both.
  • the software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

Abstract

L'invention concerne un procédé de transmission pour des entrées multiples sorties multiples (MIMO) en liaison descendante. Ce procédé comprend les étapes suivantes : les indicateurs de matrice de précodage (PMI) émis par au moins deux équipements utilisateur sont reçus et il est déterminé que les au moins deux équipements utilisateur se trouvent à l'état apparié selon le critère d'appariement MIMO multi-utilisateur (MU-MIMO) ; selon les PMI émis par le premier équipement utilisateur, la formation de faisceau et l'ajustement de la puissance d'appariement sont réalisés pour la transmission de données sur le canal partagé de liaison descendante physique (PDSCH) distribué au premier équipement utilisateur dans le premier mode des modes de transmission d'évolution à long terme (LTE), l'ajustement des pondérations de formation de faisceau est effectué sur le second équipement utilisateur qui se trouve dans le second mode de sorte que les pondérations de la matrice de précodage du second équipement utilisateur sont orthogonales à celles du premier équipement utilisateur, et l'ajustement de puissance est réalisé sur le second équipement utilisateur afin de satisfaire à la contrainte de puissance totale du premier équipement utilisateur et du second équipement utilisateur appariés. Le problème de l'appariement de l'équipement utilisateur dans des modes MIMO différents peut être résolu à l'aide du procédé décrit dans es modes de réalisation de l'invention.
PCT/CN2013/070381 2013-01-11 2013-01-11 Procédé de transmission et station de base pour des entrées multiples sorties multiples en liaison descendante WO2014107888A1 (fr)

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CN201380001027.6A CN104185956B (zh) 2013-01-11 2013-01-11 下行多输入多输出发射方法及基站
PCT/CN2013/070381 WO2014107888A1 (fr) 2013-01-11 2013-01-11 Procédé de transmission et station de base pour des entrées multiples sorties multiples en liaison descendante

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