WO2012094948A1 - Procédé de précodage coordonné, et procédé et système d'échange d'informations coordonné - Google Patents

Procédé de précodage coordonné, et procédé et système d'échange d'informations coordonné Download PDF

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Publication number
WO2012094948A1
WO2012094948A1 PCT/CN2011/085028 CN2011085028W WO2012094948A1 WO 2012094948 A1 WO2012094948 A1 WO 2012094948A1 CN 2011085028 W CN2011085028 W CN 2011085028W WO 2012094948 A1 WO2012094948 A1 WO 2012094948A1
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Prior art keywords
cell
precoding
information
base station
user terminal
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PCT/CN2011/085028
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English (en)
Chinese (zh)
Inventor
陈艺戬
李儒岳
郁光辉
郭森宝
孙云锋
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中兴通讯股份有限公司
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Publication of WO2012094948A1 publication Critical patent/WO2012094948A1/fr

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    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0466—Wireless resource allocation based on the type of the allocated resource the resource being a scrambling code

Definitions

  • the present invention relates to the field of mobile communication technologies, and in particular, to a cooperative precoding method, a cooperative information interaction method and system.
  • a cell (CELL) edge receives signals from a plurality of cells outside the serving cell to form strong interference.
  • SINR Signal Interference Noise Ratio
  • the signal sent by the base station 2 (eNodeB 2) to the user terminal UE2 at the edge of the serving cell may be the base station 1 (eNodeB l)
  • the user terminal UE1 at the edge of the serving cell forms interference, and the user terminal UE1 is subject to strong interference from the eNodeB2 signal.
  • the signal of the user terminal UE1 sent by the eNodeB1 to the edge of the serving cell may also form a strong interference to the cell edge user terminal UE2 served by the eNodeB2.
  • one solution is to solve the interference problem by scheduling in the time domain or the frequency domain, which is commonly referred to as a cooperative scheduling technique.
  • the simple cooperative scheduling technology can enable the users at the cell edge to avoid transmitting at the same time-frequency resource location at the same time as the users at the cell edge by the interaction of the information between the cells and the base stations.
  • the positions of the user terminals UE1 and UE2 are relatively similar, so that the interference scenario in the interference scenario shown in FIG. 1 is likely to generate strong interference, and the cooperative scheduling technique can be slowed to some extent. Solve the interference problem.
  • FIG. 1 the scenario shown in FIG.
  • the eNodeB2 when UE1, UE2, and eNodeB2 are in the same straight line, when the three are in the same straight line or close to the same straight line, in the case that the channel has a direct channel (LOS) path, the eNodeB2 sends out
  • the signal to UE2 may not be completely attenuated when it arrives at UE1, and there is a strong interference power arrival, so UE1 may still be subject to strong interference from eNB2. Therefore, the cooperative scheduling technology cannot solve the cell edge interference problem well by coordination in the time-frequency domain.
  • FIG. 3 Another solution is to solve the interference problem by cooperative beamforming in the airspace.
  • the schematic scenario of the application is shown in Figure 3.
  • the cooperative beamforming of the airspace mainly performs beam coordination (also referred to as cooperative precoding) according to channel information.
  • This technique can better eliminate interference. It relies on channel information feedback from UE1 to eNodeB2. It needs to feed back the channel information of subbands in each frequency domain, and increase the feedback amount of the uplink channel. Moreover, because it is at the edge of the cell, User feedback accuracy is also affected.
  • the UE needs to feed back additional channel information, can not achieve mode transparency, and needs to design a new mode.
  • the technology cannot be supported;
  • additional uplink is required.
  • the UE1 measures the channel between the eNodeB2 and the channel between them, it will bring a certain channel estimation error, and the estimated channel information quantized by the feedback will also bring certain errors;
  • the eNodeB2 needs to ensure the transmission quality of the UE2 and does not interfere with the UE1.
  • the two channels need to have good orthogonality. Therefore, it is necessary to select an appropriate UE2 during scheduling, which will bring certain scheduling restrictions. .
  • the technical problem to be solved by the present invention is to provide a cooperative precoding method, a cooperative information interaction method and system, which are used to solve the interference problem between adjacent cells.
  • the present invention provides a mobile communication system using cooperative precoding, including: a first base station to which a first cell belongs and a first user terminal served by a first cell, and a second user belonging to a second cell a second user terminal served by the base station and the second cell; wherein, in the same time-frequency resource, the first base station uses the first pre-encoding weight in the first cell to wait for the first user terminal Transmitting a symbol to perform precoding, and transmitting data to the first terminal; the second base station precoding the to-be-transmitted symbol of the second user terminal by using the second precoding weight in the second cell, and sending the data to the second terminal;
  • the first precoding weight and the second precoding weight are orthogonal.
  • the first base station and the second base station are the same base station or different base stations, that is, the first cell and the second cell belong to the same base station or preferably, the first precoding weight W
  • a vector or matrix of 2 xm which is the number of transmitting antennas
  • m is a positive integer less than or equal to 2
  • ⁇ and ⁇ are the same or different vectors or matrix.
  • the ⁇ and ⁇ are orthogonal relationships.
  • the first precoding weight and the second precoding weight are respectively codewords in the 8 antenna layer 1 codebook in the LTE-A standard;
  • the first cell feeds back precoding information on a part or all of the transmission resource locations to the second cell through the first base station to which the first cell belongs; and/or, the second cell passes the second base station to which the second cell belongs The first cell feeds back precoding information on the same or different transmission resources as the first cell.
  • the precoding information is quantized using a precoding codebook, including using the codeword index information corresponding to the precoding codebook to represent the precoding information; or the precoding information is quantized using a parameter codebook,
  • the method includes: the first cell and the second cell agree on a precoding model, and quantize the parameters in the model by using parameter index information corresponding to the parameter codebook.
  • the present invention also provides a method for cooperative precoding in a mobile communication system, where the first base station to which the first cell belongs and the first user terminal served by the first cell, the second base station to which the second cell belongs, and the second In the mobile communication system of the second user terminal served by the cell, the method includes: on the same time-frequency resource, the first base station performs, on the first cell, the first pre-coding weight to perform the to-be-transmitted symbol of the first user terminal. Transmitting the data to the first terminal after precoding; the second base station precoding the to-be-transmitted symbol of the second user terminal by using the second precoding weight in the second cell, and transmitting the data to the second terminal; the first precoding The weight is orthogonal to the second precoding weight.
  • the first base station and the second base station are the same base station or different base stations, that is, the first cell and the second cell belong to the same base station or, preferably, the first precoding weight W
  • a vector or matrix of 2 xm which is the number of transmitting antennas
  • m is a positive integer less than or equal to 2
  • ⁇ and ⁇ are the same or different vectors or matrix.
  • the ⁇ and ⁇ are orthogonal relationships.
  • the first precoding weight and the second precoding weight are respectively codewords in the 8 antenna layer 1 codebook in the LTE-A standard;
  • the first cell feeds back precoding information on a part or all of the transmission resource locations to the second cell through the first base station to which the first cell belongs; and/or, the second cell passes the second base station to which the second cell belongs
  • the first cell feeds back precoding information on the same or different transmission resources as the first cell.
  • the precoding information is quantized using a precoding codebook, including using the codeword index information corresponding to the precoding codebook to represent the precoding information; or the precoding information is quantized using a parameter codebook
  • the method includes: the first cell and the second cell agree on a precoding model, and quantize the parameters in the model by using parameter index information corresponding to the parameter codebook.
  • the present invention also provides an interaction method for d and interval cooperation information, which is applied to a first base station to which the first cell belongs and a first user terminal served by the first cell, and a second base station and a second cell to which the second cell belongs.
  • the interaction method includes: the first cell feeds back precoding information at a part or all of the transmission resource location to the second cell through the first base station to which the first cell belongs; Or,
  • the second cell feeds back precoding information on some or all of the transmission resource locations to the first cell through the second base station to which the second cell belongs.
  • the method further includes: the second cell performs cooperative precoding according to the precoding information fed back by the first cell; and/or, the first cell performs cooperative precoding according to the precoding information fed back by the second cell. .
  • the precoding information is quantized using a precoding codebook, including using the codeword index information corresponding to the precoding codebook to represent the precoding information; or the precoding information is quantized using a parameter codebook,
  • the method includes: the first cell and the second cell agree on a precoding model, and quantize the parameters in the model by using parameter index information corresponding to the parameter codebook.
  • the precoding information is quantized using the precoding codebook, further comprising: indicating the precoding codebook or the parameter codebook by using layer indication information.
  • the N bits are used to represent precoding index information or parameter index information.
  • the agreed model u u
  • the first cell and/or the second cell use 2 bits to inform the coordinator of the parameter ⁇ information of the model F.
  • the defined model u u
  • the first cell and/or the second cell respectively use the au method of codebook quantization to quantize the parameter ⁇ , ⁇ information of the model and then notify the collaborator.
  • the LTE-A 4 antenna or the 8 antenna codebook or a subset thereof is used to quantize the precoding information, and the corresponding index information is notified to the collaborator.
  • the present invention also provides a mobile communication system using cooperative precoding, comprising: a first transmission node and a first user terminal served by the first transmission node, a second transmission node, and a second service provided by the second transmission node a user terminal; wherein, on the same time-frequency resource,
  • the first transmitting node pre-codes the to-be-transmitted symbol of the first user terminal by using the first pre-encoding weight to send data to the first terminal;
  • the second transmission node pre-codes the to-be-transmitted symbol of the second user terminal by using the second pre-encoding weight to send data to the second terminal;
  • the first precoding weight and the second precoding weight are in an orthogonal relationship.
  • the present invention also provides a method for cooperative precoding in a mobile communication system, comprising: a first transmission node and a first user terminal served by the first transmission node, a second transmission node, and a second transmission node In a mobile communication system of a two user terminal, the method includes:
  • the first transmission node pre-codes the to-be-transmitted symbol of the first user terminal by using the first pre-encoding weight to send data to the first terminal; the second transmission node uses the second pre-encoding weight And pre-coding the to-be-transmitted symbol of the second user terminal, and sending the data to the second terminal; the first pre-encoding weight and the second pre-encoding weight are in an orthogonal relationship.
  • the present invention also provides a method for interacting cooperative information, which is applied to a first user terminal that is served by a first transmission node and a first transmission node, and a second user terminal that is served by a second transmission node and a second transmission node.
  • the interaction method includes: the first transmission node feeding back to the second transmission node the precoding information at a part or all of the transmission resource locations; and/or,
  • the second transmission node feeds back to the first transmission node at a part or all of the transmission resource location Precoded information.
  • the interference signal is forced to zero based on the interference channel information, so that no interference signal arrives at the receiving end as much as possible, but the present invention uses orthogonal cooperative precoding between cells, and uses the orthogonality of the receiving space to achieve interference cancellation.
  • the purpose is to allow the interference signal to arrive at the receiving end. Since the cooperative precoding makes the signals from different cells have orthogonality in the receiving space, the useful signal is extracted at the time of receiving, and the interference is reduced due to the orthogonal relationship. offset.
  • the present invention has the following advantages:
  • 1 is a schematic diagram of cell edge user interference
  • FIG. 2 is a schematic diagram of a scenario in which UE1, UE2, and eNodeB2 are in the same straight line;
  • FIG. 3 is a schematic diagram of a scenario of cooperative beamforming in spatial domain interference cancellation;
  • Figure 4 is a schematic diagram of precoding and precoding information interaction.
  • a new cooperative precoding technical solution is proposed for the problem of inter-cell interference and cooperative precoding, which can be achieved without relying on additional feedback of the UE.
  • Good purpose to eliminate interference It can be applied to the scenarios in Figures 1 to 3. It can also be applied to scenarios with other neighboring cells. Further, an interactive technical scheme for inter-cell cooperation information is also given.
  • the cell A and the cell B are adjacent cells, and the cooperative precoding method of the two cells includes:
  • the cell A pre-codes the to-be-transmitted symbol of the user UE1 to which it serves, and performs data transmission.
  • the cell B pre-codes and transmits the data to be transmitted by the user UE2 serving the UE.
  • the sum is a precoding weight, and the two are orthogonal relationships.
  • 3 ⁇ 4 can be w a -.
  • an inter-cell cooperation information interaction method includes: the cell A feeds back to the cell B some or all of the precoding information on the transmission resource location; further, the cell B feeds back to the cell A some or all of the transmission resource locations. Encoding information.
  • the transmission and reception of the cell A and the cell B can be performed by the base station to which they belong, and the two can belong to the same base station or belong to different base stations.
  • the first base station to which the cell A belongs sends the data to the terminal 1 after the cell A uses the first precoding weight to precode the to-be-transmitted symbol of the user terminal 1.
  • the second base station to which the cell B belongs sends the data to the terminal 2 after the cell B uses the second precoding weight ⁇ to precode the to-be-transmitted symbol of the user terminal 2.
  • the first precoding weight w a and the second precoding weight ⁇ are in an orthogonal relationship.
  • the first base station and the second base station are the same base station or different base stations, that is, the first cell and the second cell belong to the same base station or belong to the first precoding weight W.
  • ⁇ are respectively a vector or matrix of xm
  • ⁇ ⁇ is the number of transmitting antennas
  • m A positive integer less than or equal to 2 is any real number or complex number.
  • the sum is the same or different vector or matrix.
  • the sum is an orthogonal relationship.
  • the cell When the cooperation information between A and B is exchanged, the cell A feeds back some or all of the precoding information on the resource location to the cell B. Further, the cell B feeds back some or all of the precoding information on the resource location to the cell A.
  • the transmission and reception of A and cell B can be done by the base station to which they belong, and both can belong to the same base station or different base stations.
  • M is an RB (Resource Block) or a plurality of RBs
  • the parameter example can be , where, for a complex number, can take the value 1, , -1 , j , lKm yi ⁇
  • Both cells A and B which belong to or do not belong to the same base station, and perform cooperative transmission. Both cells A and B have Nt root transmit antennas.
  • M On a time-frequency transmission resource M, M is an RB (Resource Block) or a plurality of RBs, and Cell A pre-codes the use of its serving user UE1.
  • W N I lu n lu n , / is a unit matrix, and ⁇ represents the column vector of the matrix ⁇ .
  • h Mn) represents a matrix composed of the jth, j nth columns of the matrix Wk .
  • M7 fl 0
  • W [l 1 1 i on the same time-frequency transmission resource M
  • w b which may be the 4 antenna layer 1 in the LTE-A standard.
  • Example 3 Example 3:
  • Both cells A and B have Nt root transmit antennas.
  • the 8 antennas of LTE-A are 4 layers:
  • it can be m a m a
  • ⁇ v ⁇ V is a complex number, which can take values 1, -1, j, -j, etc., v m , is DFT
  • the cell ⁇ pre-codes its service user UE2 using w b , which may be two of the code words of the 8 antenna layer 4 codebook in the LTE-A standard. For example, it can be
  • the precoding weight may be:
  • Embodiment 5 There are a cell A and a cell B, which belong to or do not belong to the same base station, and perform cooperative transmission. Both cells A and B have Nt root transmit antennas.
  • M On a time-frequency transmission resource M, M is a resource block RB (Resource Block) or multiple resource blocks (RBs), and cell A pre-codes its service user UE1. It can be any of the following indexes (Index) 0 ⁇ 3.
  • the cell B service to its users UE2 precoded using w3 ⁇ 4: When "
  • Embodiment 6 There are a cell A and a cell B, which may belong to the same base station or belong to different base stations for cooperative transmission.
  • the cell A sends the precoding information on the time-frequency transmission resource M to the cell B.
  • M is a resource block RB (Resource Block) or a plurality of resource blocks (RBs); correspondingly, the cell B performs cooperative precoding according to precoding information and layer information transmitted by the cell A.
  • the cell A may send precoding information on the partial time-frequency transmission resource location M1 (M1 is a part of M) to the cell B; the cell B will additionally precoding information on a part of the time-frequency transmission resource location M2. Send to cell A.
  • the cell B performs cooperative precoding according to the precoding information transmitted by the cell A:
  • the cell A performs cooperative precoding according to the precoding information transmitted by the cell B.
  • the cell A and the cell B can transmit precoding information on the same time-frequency transmission resource location. For example, on the same time-frequency transmission resource M, the cell A sends the precoding information to the cell B, and the cell B also sends the precoding information to the cell A. Cell A and cell B re-negotiate for cooperative precoding.
  • Embodiment 7 Precoding information is quantized using a precoding codebook, including using the codeword index information corresponding to the precoding codebook to represent the precoding information; or, the precoding information is quantized using a parameter codebook, including, A cell and a second cell agree on a precoding model, and quantize the parameters in the model using parameter index information corresponding to the parameter codebook.
  • the quantizing the precoding information using the precoding codebook further comprises: indicating the precoding codebook or the parameter codebook using layer indication information. When the first cell and/or the second cell transmit precoding information, N bits are used to represent precoding index information or parameter index information.
  • the agreed model is u.
  • the first cell and/or the second cell use 2 bits to inform the cooperative au party of the parameter information of the model F, the first cell and/or the second cell transmitting the pre- When encoding information, the defined model is u
  • the first cell and/or the second cell respectively quantize the parameters ⁇ and ⁇ of the model using the square au method of codebook quantization, and then notify the collaborator.
  • the LTE-A 4 antenna or the 8 antenna codebook or a subset thereof is used to quantize the precoding information, and the corresponding index information is notified to the collaborator.
  • the N bits are used to quantize the precoding information. For example, one or two bits are used to quantize layer information; N bits are used to represent precoding information.
  • the precoding information is quantized using a subcodebook corresponding to the layer, and 2 W is equal to the number of codewords of the layer corresponding to the subcodebook.
  • 2 W is equal to the number of codewords of the layer corresponding to the subcodebook.
  • other codebooks can also be used.
  • the model used as defined limits the associated alpha, ⁇ information to the usable amount of au bits. More generally, the above method can be used between different transport nodes:
  • a mobile communication system using cooperative precoding includes: a first transmission node and a first user terminal served by the first transmission node, a second transmission node, and a second user terminal served by the second transmission node; On the same time-frequency resource,
  • the first transmitting node pre-codes the to-be-transmitted symbol of the first user terminal by using the first pre-encoding weight to send data to the first terminal;
  • the second transmission node pre-codes the to-be-transmitted symbol of the second user terminal by using the second pre-encoding weight to send data to the second terminal;
  • the first precoding weight and the second precoding weight are in an orthogonal relationship.
  • the method for cooperative precoding in a mobile communication system includes: a first user node, a first user terminal served by the first transmission node, a second user node, and a second user terminal served by the second transmission node
  • the method includes:
  • the first transmission node pre-codes the to-be-transmitted symbol of the first user terminal by using the first pre-encoding weight to send data to the first terminal;
  • the second transmission node uses the second pre-encoding weight And pre-coding the to-be-transmitted symbol of the second user terminal, and sending the data to the second terminal;
  • the first pre-encoding weight and the second pre-encoding weight are in an orthogonal relationship.
  • a method for interacting cooperative information is applied to a mobile communication including a first user node and a first user terminal served by the first transmission node, a second transmission node, and a second user terminal served by the second transmission node
  • the interaction method includes: the first transmission node feeding back, to the second transmission node, precoding information at a part or all of the transmission resource locations; and/or,
  • the second transmission node feeds back precoding information at a portion or all of the transmission resource locations to the first transmission node.
  • each column multiplied by a constant coefficient belongs to the equivalent transformation of the present invention, and does not affect the implementation effect of the present invention.
  • any column exchange of the columns it contains belongs to its equivalent transformation, and does not affect its implementation effect.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé de précodage coordonné, et sur un procédé et un système d'échange d'informations coordonné. Le système comprend un premier nœud B évolué dont relève une première cellule et un premier terminal utilisateur que dessert la première cellule, un second nœud B évolué dont relève une seconde cellule et un second terminal utilisateur que dessert la seconde cellule. Sur le même segment de ressources temps-fréquence, les symboles à envoyer du premier terminal utilisateur sont précodés par le premier nœud B évolué à l'aide d'une première valeur pondérée de précodage dans la première cellule et ensuite envoyés au premier terminal; les symboles à envoyer du second terminal utilisateur sont précodés par le second nœud B évolué à l'aide d'une seconde valeur pondérée de précodage dans la seconde cellule et ensuite envoyés au second terminal; et la première valeur pondérée de précodage et la seconde valeur pondérée de précodage sont dans une relation d'orthogonalité. Le procédé et le système de la présente invention utilisent un précodage coordonné orthogonal entre cellules afin d'atteindre l'objectif d'éliminer le brouillage par utilisation de l'orthogonalité de l'espace de réception.
PCT/CN2011/085028 2011-01-12 2011-12-30 Procédé de précodage coordonné, et procédé et système d'échange d'informations coordonné WO2012094948A1 (fr)

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WO2010145422A1 (fr) * 2009-11-06 2010-12-23 中兴通讯股份有限公司 Procédé et système de réalisation d'un précodage de multiplexage multiutilisateur dans une transmission multipoint coordonnée
CN101867533A (zh) * 2010-05-27 2010-10-20 东南大学 空分多址多天线传输下行链路导频与信道估计方法
CN102075294A (zh) * 2011-01-12 2011-05-25 中兴通讯股份有限公司 一种协作预编码方法、协作信息交互方法及系统

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