WO2011137740A1 - 发送预编码矩阵索引及进行预编码的方法和装置 - Google Patents

发送预编码矩阵索引及进行预编码的方法和装置 Download PDF

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Publication number
WO2011137740A1
WO2011137740A1 PCT/CN2011/073632 CN2011073632W WO2011137740A1 WO 2011137740 A1 WO2011137740 A1 WO 2011137740A1 CN 2011073632 W CN2011073632 W CN 2011073632W WO 2011137740 A1 WO2011137740 A1 WO 2011137740A1
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Prior art keywords
matrix
codebook set
precoding matrix
user equipment
base station
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PCT/CN2011/073632
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English (en)
French (fr)
Inventor
吴强
马提亚斯·文斯特隆
孙卫军
周永行
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to ES11777161.8T priority Critical patent/ES2548543T3/es
Priority to JP2013508362A priority patent/JP5601602B2/ja
Priority to EP11777161.8A priority patent/EP2557721B1/en
Priority to KR1020127028900A priority patent/KR101441555B1/ko
Priority to EP15158538.7A priority patent/EP2908489B1/en
Priority to RU2012146940/08A priority patent/RU2558618C2/ru
Publication of WO2011137740A1 publication Critical patent/WO2011137740A1/zh
Priority to US13/667,402 priority patent/US8731043B2/en
Priority to US14/249,105 priority patent/US8982983B2/en
Priority to US14/565,979 priority patent/US9124321B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0636Feedback format
    • H04B7/0639Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0478Special codebook structures directed to feedback optimisation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0482Adaptive codebooks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0636Feedback format
    • H04B7/0645Variable feedback
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0658Feedback reduction
    • H04B7/0663Feedback reduction using vector or matrix manipulations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10Polarisation diversity; Directional diversity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891Spatial equalizers
    • H04L25/03898Spatial equalizers codebook-based design
    • H04L25/03904Spatial equalizers codebook-based design cooperative design, e.g. exchanging of codebook information between base stations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891Spatial equalizers
    • H04L25/03898Spatial equalizers codebook-based design
    • H04L25/03942Spatial equalizers codebook-based design switching between different codebooks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03891Spatial equalizers
    • H04L25/03949Spatial equalizers equalizer selection or adaptation based on feedback
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08Access point devices
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for transmitting a precoding matrix index and performing precoding.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • W WW ( ⁇ , 1 2 ( 1 ) where ⁇ belongs to a codebook set d, ⁇ belongs to another codebook set C 2 .
  • Mainly represents the broadband / long-term channel characteristics;
  • W 2 represents the sub-band / instantaneous Channel characteristics
  • the PMI (Precoding Matrix Index) information can be reported on the physical uplink control channel (PUCCH) or the physical uplink shared channel (Physical Uplink Shared CHannel PUSCH).
  • the PMI information includes up to 4 bits.
  • One aspect of the present invention provides a method for transmitting a PMI, which can implement flexible configuration and use of a PMI.
  • the method includes:
  • the user equipment selects a first precoding matrix from the second codebook set, where the second codebook set is set according to the capability of the transport channel to carry the PMI;
  • the user equipment sends an index corresponding to the first precoding matrix to the base station by using the transport channel, so that the base station searches the first precoding matrix according to the index and according to the first precoding matrix pair.
  • the data is precoded.
  • Another aspect of the present invention provides a method for performing precoding that can implement flexible configuration and use of PMI.
  • the method includes:
  • the base station receives an index corresponding to the first precoding matrix that is sent by the user equipment by using the transmission channel, where the first precoding matrix is selected by the user equipment from the second codebook set, and the second codebook set is Set according to the capability of the transport channel to carry the PMI;
  • the base station searches the first precoding matrix from the locally saved third codebook set according to the index, and precodes the data according to the first precoding matrix, where the third codebook set Same as the second codebook set.
  • a user equipment can implement flexible configuration and use of a PMI.
  • the method includes:
  • a selecting unit configured to select a first precoding matrix from the second codebook set, where the second codebook set is set according to a capability of the transport channel to carry a PMI;
  • a sending unit configured to send, by using the transport channel, an index corresponding to the first precoding matrix to a base station, so that the base station searches the first precoding matrix according to the index, and according to the first precoding matrix Precode the data.
  • a base station including:
  • a receiving unit configured to receive an index corresponding to the first precoding matrix that is sent by the user equipment by using the transmission channel, where the first precoding matrix is selected by the user equipment from the second codebook set, and the second The codebook set is set according to the capability of the transport channel to carry the PMI; a precoding unit, searching, according to an index received by the receiving unit, the first precoding matrix from a third codebook set locally saved by the base station, and precoding the data according to the first precoding matrix, where The third codebook set is the same as the second codebook set.
  • FIG. 1 is a schematic structural view of a prior art ULA antenna
  • FIG. 2 is a schematic structural view of a dual-polarized antenna in the prior art
  • FIG. 3 is a flowchart of a method for transmitting a PMI according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for performing precoding according to an embodiment of the present invention
  • a schematic structural diagram of a user equipment is provided.
  • FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for transmitting a PMI according to an embodiment of the present invention, including: Step 301: A UE acquires a capability of a transport channel to carry a PMI.
  • the transport channel refers to a channel that carries or carries a PMI, and may include: a PUCCH channel, a PUSCH channel, and the like.
  • the method for the UE to acquire the capability of the transport channel to carry the PMI may include: receiving, by the base station, signaling for notifying the capability of the transport channel to carry the PMI, or Obtained in the list of capabilities of the locally stored transport channel carrying PMI.
  • the capability of the transport channel to carry the PMI refers to the maximum number of bits in the transport channel that can be used to carry the PMI; for example, on the PUCCH channel, the PMI can carry up to 4 bits, and on the PUSCH channel, the PMI is the most It can carry 6 bits; this capability can be pre-configured according to the needs of transmitting data.
  • the UE may select a precoding matrix from the locally saved first codebook set to form a second codebook set according to the capability of the transport channel to carry the PMI. Specifically, all the first codebook sets may be selected according to actual conditions of the transport channel, or a subset of the first codebook set may be selected as the second codebook set.
  • the foregoing first codebook set may be: the base station and the UE are respectively stored locally, and can be used for data transmission of the UE.
  • ⁇ and X are both used to adjust the phase relationship between the two sets of polarized antennas.
  • the arrangement is as shown in FIG. 2, and D is a diagonal matrix of 4 ⁇ 4.
  • T 2 b kinds. Possible values.
  • A is obtained by using the existing codebook structure based on Discrete Fourier Transform (DFT).
  • DFT Discrete Fourier Transform
  • M is the dimension of DFT
  • m 0, 1...M-1
  • n 0, 1...M-1
  • DFT DFT
  • M 4.
  • the value is (1, -1).
  • ⁇ , ⁇ is a matrix of 1 x 1
  • the first codebook set has a total of one bit representation
  • D and A can function to adjust the transmission direction of the beam
  • a common 5 bits are represented, assuming D is represented by one bit, and in (3), g is fixed. Take 1 or - 1, ⁇ 1 0 0 0, ( ⁇ 0 0 0 0
  • ⁇ 0 0 0 , 0 0 0 A is represented by 4 bits; since both ⁇ and X represent the adjustment of the phase between two sets of different polarized antennas, a total of 2 bits can be represented.
  • the total number of bits of the ⁇ is consistent with the carrying capacity of the transmission channel. Consistent here, it is meant that the sum of the total number of bits describing D, A, ⁇ , X is the same as the number of bits that the transmission channel can transmit. For example, on the PUCCH channel, up to 4 bits are transmitted. Then the total number of bits of D, A, ⁇ , and X is 4.
  • A is set to 3-bit information, and ⁇ is 1 bit.
  • the PMI can have 6 bits, then the total number of bits of D, A, ⁇ , and X is 6, so that 1 bit can represent D and ⁇ be fixed to 1. Three bits are used to represent A, and X is represented by two bits, and a total of six bits are used for representation. If a 7-bit PMI is uploaded on the PUSCH, then A can be 4 bits, D is 1 bit, and X is 2 bits.
  • the second codebook set is selected from the first codebook set. When the second codebook set is a subset of the first codebook set, the selected criterion is that the second codebook set is divided into signal spaces as much as possible.
  • the UE may also directly select a codebook set adapted to the capability as the second codebook set according to the capability of the transport channel to carry the PMI. For details, refer to the next method embodiment of the present invention. .
  • Step 303 The UE selects, according to the second codebook set, a first precoding matrix used by the base station to perform precoding.
  • the UE When the UE selects precoding in the second codebook set, it can be selected according to a certain setting principle.
  • the specific selection principle can refer to the prior art, for example, selecting one can maximize the data signal to noise ratio.
  • the precoding matrix is used as the first precoding matrix.
  • Step 304 Send, by using the transport channel, an index corresponding to the first precoding matrix to a base station.
  • the index corresponding to the first precoding matrix refers to a number corresponding to the first precoding matrix in the newly established index after indexing the precoding matrix in the second codebook set. For example, when the PUCCH is used as the transmission channel, if the first codebook set includes 32 codebook matrices, if the PUCCH can only transmit the PMI by using 4b it, 16 codebook matrices can be selected from the first codebook set.
  • Two codebook sets and use 0-15 (represented by 4bi t) as the index of the above 16 codebook matrices; if the codebook matrix numbered 0 is selected as the first precoding matrix, the corresponding precoding The index corresponding to the matrix may be represented as 0000; or, if the codebook matrix numbered 2 is selected as the first precoding matrix, the index corresponding to the corresponding precoding matrix may be represented as 0010.
  • the codebook set used by the user equipment is configured according to the channel capability, and the PMI is fed back to the base station, so that the base station can obtain different precision according to the bearer capability of the transport channel of the user equipment. PMI.
  • the foregoing method may further be:
  • FIG. 4 is a flowchart of a method for performing precoding according to an embodiment of the present invention, including: Step 401: A base station receives an index corresponding to a first precoding matrix sent by a user equipment by using a transmission channel.
  • the first precoding matrix is selected by the user equipment from the second codebook set
  • the second codebook set is selected by the user equipment from the locally saved first codebook set.
  • the corresponding description in the embodiment shown in FIG. 3 may be referred to.
  • Step 402 The base station searches for the first precoding matrix according to the index corresponding to the obtained first precoding matrix.
  • the first precoding matrix may be searched from a locally saved third codebook set according to an index, and the data is precoded according to the first precoding matrix, where the third code This set is the same as the second codebook set.
  • the same refers to the same number of precoding matrices included in the third codebook set and the second codebook set; and the third codebook set is the same as the precoding matrix in the second codebook set;
  • the same index value in the third codebook set and the second codebook set represents the same precoding matrix.
  • the third codebook set may be preset by the base station according to the capability of the UE to transmit the PMI transport channel or the type of the transport channel.
  • the manner in which the base station establishes the index corresponding to each precoding matrix in the third code set is substantially the same as that in the embodiment shown in FIG. 3, and details are not described herein again.
  • Step 403 The base station performs precoding using the precoding matrix obtained in step 403.
  • the base station pre-codes the data sent to the UE by using the obtained PMI fed back by the UE.
  • precoding matrices with different precisions are obtained. Therefore, the flexible setting of the PMI is ensured, and the transmission channel resources are rationally utilized.
  • all or part of the steps in the above embodiments may be implemented by hardware related to program instructions, and the above program may be stored in a computer readable state.
  • the above storage medium may be a ROM/RAM, a magnetic disk, an optical disk, or the like.
  • FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention.
  • the user equipment can implement the method provided in the foregoing method, where the user equipment includes:
  • the obtaining unit 501 is configured to acquire a capability of the transport channel to carry the PMI.
  • the selecting unit 502 is configured to perform, according to the transport channel bearer acquired by the acquiring unit 501
  • the sending unit 503 is configured to send, by using the index corresponding to the first precoding matrix selected by the selecting unit 502, on the transport channel.
  • each unit module For the interaction between each unit module and the base station in the foregoing user equipment, and the specific implementation manner of each unit function, refer to the description in the method embodiments corresponding to FIG. 3 and FIG. 4 above.
  • the codebook set used by the user equipment is configured according to the channel capability, and the PMI is fed back to the base station, so that the base station can obtain different precision according to the bearer capability of the transport channel of the user equipment. PMI.
  • FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present disclosure, where the base station can implement the method provided in the foregoing method, where the base station includes:
  • the receiving unit 601 is configured to receive an index corresponding to the first precoding matrix that is sent by the user equipment by using the transmission channel, where the first precoding matrix is selected by the user equipment from the second codebook set, where the The two codebook set is composed of a precoding matrix selected by the user equipment from a locally saved first codebook set;
  • the precoding unit 602 is configured to search the first precoding matrix from the locally saved third codebook set according to the index received by the receiving unit 601, and precode the data according to the first precoding matrix,
  • the third codebook set is the same as the second codebook set. .
  • the base station may further include:
  • the sending unit 603 is configured to send, to the user equipment, a notification for the user equipment to send the The signaling of the ability of the transport channel to carry the PMI, so that the user equipment selects a precoding matrix from the first set of codebooks to form a second codebook set according to the capability of the transport channel to carry the PMI.
  • the UE and the base station may also pre-determine the ability of different transport channels to carry PMI.
  • the base station can set the feedback PMI capability of different transmission channels of the user equipment according to requirements, thereby obtaining PMIs with different precisions.
  • the functional units in the various embodiments of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules.
  • the above integrated modules can also be stored in a computer readable storage medium if they are implemented in the form of software functional modules and sold or used as separate products.
  • the storage medium mentioned above may be a read only memory, a magnetic disk or an optical disk or the like.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Description

发送预编码矩阵索引及进 ^编码的方法和装置 本申请要求于 2010 年 5 月 4 日提交中国专利局、 申请号为 201010169491.4、 发明名称为"发送预编码矩阵索引及进行预编码的方法和 装置"的中国专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域 本发明实施例涉及通信领域, 尤其涉及一种发送预编码矩阵索引及进 行预编码的方法和装置。 背景技术 在第三代合作伙伴项目(3rd Generation Partnership Project 3GPP) 长期演进(Long Term Evolution: LTE)版本 10中, 基站将会引入八根发送 天线, 对相关的天线配置, 有两种天线的配置方式。 ULA天线配置如图 1所 示, 和双极化的天线配置, 如图 2所示。 在目前的 3GPP的关于 8天线码本 的讨论中, 已经达成以下一致意见。 目前的预编码由两部分组成
W = WW ( Λ、 1 2 ( 1 ) 其中 ^属于一个码本集合 d, ^属于另一个码本集合 C 2。 主要代 表的是宽带 /长期的信道特性; W2表示的子带 /瞬时的信道特性
在 3GPPLTE版本 8中, PMI (预编码矩阵索引, Precoding Matrix Index) 信息可以通过物理上行控制信道 (Physical Uplink Control CHannel, PUCCH)或物理上行共享信道(Physical Uplink Shared CHannel PUSCH)上 报。 其中 PMI信息最多包括 4比特。
现有技术中, 无法根据传输信道的情况对 PMI进行灵活配置和使用。 发明内容 本发明一方面提供了一种发送 PMI 的方法, 可以实现对 PMI 的灵活配 置和使用。 该方法包括:
用户设备从第二码本集合中选择第一预编码矩阵, 其中, 所述第二码 本集合为根据传输信道承载 PMI的能力设置的;
所述用户设备通过所述传输信道向基站发送所述第一预编码矩阵对应 的索引, 以使得所述基站根据所述索引查找所述第一预编码矩阵并根据所 述第一预编码矩阵对数据进行预编码。
本发明另一方面提供了一种进行预编码的方法可以实现对 PMI 的灵活 配置和使用。 该方法包括:
基站接收用户设备通过传输信道发送的第一预编码矩阵对应的索引, 其中, 所述第一预编码矩阵为所述用户设备从第二码本集合中选择的, 所 述第二码本集合为根据所述传输信道承载 PMI的能力设置的;
所述基站根据所述索引从本地保存的第三码本集合中查找所述第一预 编码矩阵, 并根据所述第一预编码矩阵对数据进行预编码, 其中, 所述第 三码本集合与所述第二码本集合相同。
本发明又一方面提供了一种用户设备可以实现对 PMI 的灵活配置和使 用。 该方法包括:
选择单元, 用于从第二码本集合中选择第一预编码矩阵, 其中, 所述 第二码本集合为根据所述传输信道承载 PMI的能力设置的;
发送单元, 用于通过所述传输信道向基站发送所述第一预编码矩阵对 应的索引, 以使得所述基站根据所述索引查找所述第一预编码矩阵并根据 所述第一预编码矩阵对数据进行预编码。
根据本发明再又一方面, 还提供了一种基站, 包括:
接收单元, 用于接收用户设备通过传输信道发送的第一预编码矩阵对 应的索引, 其中, 所述第一预编码矩阵为所述用户设备从第二码本集合中 选择的, 所述第二码本集合为根据所述传输信道承载 PMI的能力设置的; 预编码单元, 根据所述接收单元接收的索引从所述基站本地保存的第 三码本集合中查找所述第一预编码矩阵, 并根据所述第一预编码矩阵对数 据进行预编码, 其中, 所述第三码本集合与所述第二码本集合相同。
基于上述本发明各方面, 可以根据承载 PMI的传输信道的能力, 选择不 同精度的预编码矩阵, 用于基站对传输给 UE的数据进行预编码, 从而实现 了对 PMI的灵活配置和使用。 附图说明 图 1所示为现有技术中 ULA天线的结构示意图;
图 2所示为现有技术中双极化天线的结构示意图;
图 3所示为本发明实施例提供的一种发送 PMI的方法流程图; 图 4所示为本发明实施例提供的一种进行预编码的方法流程图; 图 5所示为本发明实施例提供的一种用户设备的结构示意图; 图 6所示为本发明实施例提供的一种基站的结构示意图。 具体实施方式 为使本发明实施例的目的、 技术方案和优点更加清楚, 下面将结合本 发明实施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整地描 述, 显然, 所描述的实施例是本发明一部分实施例, 而不是全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有作出创造性劳动前提 下所获得的所有其他实施例, 都属于本发明保护的范围。
图 3为本发明实施例提供的一种发送 PMI的方法流程图, 包括: 步骤 301、 UE获取传输信道承载 PMI的能力。
在本实施例中, 传输信道指承载或携带 PMI的信道, 可以包括: PUCCH 信道、 PUSCH信道等。 UE获取传输信道承载 PMI的能力的方法可以包括: 接收基站发送的用于通知所述传输信道承载 PMI 的能力的信令, 或者, 从 本地存储的传输信道承载 PMI 的能力列表中获取。 所述传输信道承载 PMI 的能力, 指的是该传输信道中能够用于承载 PMI 的比特数的最大数目; 比 如, 在 PUCCH信道上, PMI最多可以承载 4个比特, 在 PUSCH信道上, PMI 最多可以承载 6个比特; 该能力可以根据传输数据的需要进行预先配置。 可选的, 步骤 302、 UE可以根据所述传输信道承载 PMI的能力, 从本 地保存的第一码本集合中选择预编码矩阵组成第二码本集合。 具体的, 可以根据传输信道的实际情况选择所述第一码本集合全部, 或者选择所述第一码本集合的子集作为所述第二码本集合。 上述第一码本 集合可以为: 基站和 UE分别在本地存储的, 能够用于为该 UE数据传输时
Figure imgf000006_0001
在(2 ) 中, 令发送天线数为 Nt (Nt为偶数), 预编码矩阵的秩为 R, 则 为 Ntx2R的矩阵, W2为 2RxR的矩阵。 I为 RxR的单位阵, X是一个 RxR 的对角阵, D为一个 Nt/2xNt/2的对角矩阵, A是一个 Nt/2xR的矩阵, Λ是 一个 RxR的对角矩阵。 其中
Figure imgf000006_0002
其中, 对如图 2所示的双极化天线而言, Λ, X的作用都是用于调整两 组极化天线之间的相位关系。 α β, ( i=l, ...,R)为模为 1的标量。 以 8根发送天线为例, 预编码矩阵的秩 =1为例, 比如排列方式如图 2所 示, D是一个 4x4的对角矩阵, 比如用 b个比特表示, 则有 T=2b种可能的取值。
Figure imgf000007_0001
A是采用现有的基于离散傅里叶变换 ( Discrete Fourier Transform, 以下简称: DFT) 的码本结构获取, 其计算公式如下所示:
Figure imgf000007_0002
其中, M是 DFT的维数, m=0, 1...M-1, n=0, 1...M-1, 4天线对应的
DFT, M=4。 G是 DFT的组数, g = 0, 1, ..., G_l。 e^)是码本集合中的预编 码向量, 为 中的各元素。 举例来说, G=2, 每个 4维 DFT结构即可获 取 4个 4 X 1的预编码向量, 两个 DFT结构可以产生 8个 4 X 1的预编码向 量。 所以, 如果用 3个比特表示 A, A的取值可以从这 8个 4 X 1的预编码 向量中取得。 Λ是 1 x 1的矩阵, 取值可以为单位园上的点, 比如用 b个比 特表示, 则一共有 T=2b种可能, 则取值可为 M (k=0, ...,T-1 ) 。 比如, 用一个比特表示, 则取值为 (1, -1 ) 。 Λ, Χ是 1 x 1的矩阵, 取值可以为 单位园上的点, 比如用 b个比特表示, 则一共有 T=2b种可能, 则取值可为 碎 (k=0, T-1 ) 。 假设第一码本集合一共有 Ί个比特表示,由于 D和 A起的作用可以是调 整波束的发送方向, 一共用 5个比特表示, 假设 D用一个比特表示, 在(3) 中, g固定取成 1或- 1, 丫 1 0 0 0、 (\ 0 0 0
0 1 0 0 0 0 0
D< ( 6)
0 0 1 0 0 0 0
0 0 0 、0 0 0 A用 4个比特表示;由于 Λ和 X都表示的是对两组不同极化天线间的相 位的调整, 可以一共用 2比特表示。
通过调整 D, A , Λ, X的比特数, 使总的 ΡΜΙ的比特数与传输信道的 承载能力一致。 这里所述的一致, 指的是描述 D, A , Λ, X总的比特数之 和与传输信道可以发送的 ΡΜΙ的比特数一样。 比如, 在 PUCCH信道, 最多 有 4个比特发送 ΡΜΙ。 则 D, A , Λ, X总的比特数是 4 。 可令 UE得到固 定 D = I (单位阵), X = I。 A设为 3比特信息, Λ为 1比特。 总共为 4个比 特的 PMI。 如果 PMI通过 PUSCH上传, PMI可以有 6个比特, 则 D, A , Λ, X总的比特数是 6, 可以令 1个比特表示 D, 令 Λ固定为 I。 用 3个比特来 表示 A, X用 2个比特来表示, 则一共是 6个比特来表示。 如果在 PUSCH 上传 7个比特的 PMI, 则可以令 A是 4比特, D是 1比特, X是 2比特。 从 第一码本集合选取第二码本集合, 当第二码本集合是第一码本集合的子集 时, 选取的准则为第二码本集合尽量均勾划分信号空间。 比如第一码本集 合一共有 7个比特,但第二码本集合只有 4个比特表示,可以令 D = I, A用 3比特信息表示, 可以表示 8个方向(第一码本可以表示 32个方向), 在公 式(5 ), 可以令 g=0,g=2,G=4, 得到基本均匀的 8个方向。 同时令 X = I (或 Λ = Ι, X用 1比特表示), Λ用 1比特表示,取值范围 1或 -1 (两个比特时 取值范围为 1, - 1, j,- j )。 可选的, 本步骤中, UE也可以直接根据所述传输信道承载 PMI的能力, 从本地选择适应于该能力的码本集合作为上述第二码本集合, 详见本发明 下一个方法实施例。
步骤 303、 UE根据第二码本集合, 选择基站用于进行预编码的第一预 编码矩阵。
在 UE在第二码本集合中选择预编码时, 可根据某种设定的原则进行选 择, 具体选择原则可参照现有技术, 比如选择一个能够使数据信噪比最大 的预编码矩阵作为第一预编码矩阵。
步骤 304、通过所述传输信道向基站发送所述第一预编码矩阵对应的索 引。
由于需要在传输信道上传输所选的预编码矩阵的索引, 可以使第二码 本集合中不同的预编码矩阵分别对应一个索引, 以区分表示不同的预编码 矩阵。 所述第一预编码矩阵对应的索引即指: 在为第二码本集合中的预编 码矩阵建立索引后, 该第一预编码矩阵在该新建立的索引中对应的编号。 比如:在使用 PUCCH作为传输信道时,若第一码本集合包括 32个码本矩阵, 则如果 PUCCH仅可用 4b i t传输 PMI,则可从第一码本集合中选择 16个码本 矩阵组成第二码本集合; 并使用 0-15 (可用 4bi t表示)分别作为上述 16 个码本矩阵的索引; 如果选择编号为 0 的码本矩阵作为上述第一预编码矩 阵, 则相应的一预编码矩阵对应的索引可表示为 0000; 或者, 如果选择编 号为 2 的码本矩阵作为上述第一预编码矩阵, 则相应的一预编码矩阵对应 的索引可表示为 0010。
本实施例, 通过用户设备获取传输信道的能力后, 根据该信道能力对 其使用的码本集合进行配置, 并将 PMI 反馈给基站, 从而基站可以根据用 户设备的传输信道的承载能力得到不同精度的 PMI. 作为本发明又一实施例, 上述方法还可以为:
预先针对不同传输信道承载 PMI 的能力, 设置不同的码本集合, 则上 述实施例中步骤 302 中选择的动作可以省略, 即在初始状态时即存在多种 不同的码本集合供用户设备选择, 比如上述第一码本集合和第二码本集合。 该方法与上述实施例的主要区别在于, 不需要从第一码本集合中选择出第 二码本集合, 而是可以直接根据传输信道承载 PMI 的能力选择使用第一码 本集合或第二码本集合。 图 4所示为本发明实施例提供的一种进行预编码的方法流程图, 包括: 步骤 401、基站接收用户设备通过传输信道发送的第一预编码矩阵对应 的索引。
在本实施例中, 第一预编码矩阵为所述用户设备从第二码本集合中选 择的, 所述第二码本集合为所述用户设备从本地保存的第一码本集合中选 择的预编码矩阵组成的, 第二码本集合的具体获取方式可参考图 3所示实 施例中的相应描述。
步骤 402、基站根据得到的第一预编码矩阵对应的索引查找所述第一预 编码矩阵。
在本实施例中, 可以根据索引从本地保存的第三码本集合中查找所述 第一预编码矩阵, 并根据所述第一预编码矩阵对数据进行预编码, 其中, 所述第三码本集合与所述第二码本集合相同。 所述相同指的是第三码本集 合与第二码本集合所包含的预编码矩阵的个数相同; 且第三码本集合与第 二码本集合中的预编码矩阵——相同; 且第三码本集合与第二码本集合中 同样的索引值表示的是同样的预编码矩阵。
在本实施例中, 所述第三码本集合可以是基站根据 UE用于发送 PMI的 传输信道的能力或者该传输信道的类型, 预先设定好的。 基站建立第三码 本集合中各预编码矩阵对应的索引的方式与图 3 所示实施例中大致相同, 在此不再赘述。
步骤 403、 基站使用在步骤 403中得到预编码矩阵进行预编码。
本实施例,基站通过得到的 UE反馈的 PMI,对给 UE发送的数据进行预 编码。 并根据 UE传输信道承载能力的不同, 得到不同精度的预编码矩阵。 从而保证了对 PMI的灵活设置, 合理利用传输信道资源。 本领域普通技术人员可以理解, 上述各实施例中的全部或部分步骤可 以通过程序指令相关的硬件来实现, 上述的程序可以存储于计算机可读取 存储介质中, 上述的存储介质, 可以是 R0M/RAM、 磁碟、 光盘等。
图 5 所示为本发明实施例提供的一种用户设备的结构示意图, 该用户 设备能够实现上述方法实施例中提供的方法, 该用户设备包括:
获取单元 501, 用于获取传输信道承载 PMI的能力;
选择单元 502, 用于根据所述获取单元 501 获取的所述传输信道承载
PMI的能力,从本地保存的第一码本集合中选择预编码矩阵组成第二码本集 合; 并从所述第二码本集合中选择用于对数据进行预编码的第一预编码矩 阵;
发送单元 503,用于将所述选择单元 502选择的所述第一预编码矩阵对 应的索引承载在所述传输信道上发送。
上述用户设备中各单元模块与基站的交互关系以及各单元功能的具体 实现方式, 可参照上述图 3及图 4对应的方法实施例中的描述。
本实施例, 通过用户设备获取传输信道的能力后, 根据该信道能力对 其使用的码本集合进行配置, 并将 PMI 反馈给基站, 从而基站可以根据用 户设备的传输信道的承载能力得到不同精度的 PMI。
图 6 为本发明实施例提供的一种基站的结构示意图, 该基站能够实现 上述方法实施例中提供的方法, 该基站包括:
接收单元 601,用于接收用户设备通过传输信道发送的第一预编码矩阵 对应的索引, 其中, 所述第一预编码矩阵为所述用户设备从第二码本集合 中选择的, 所述第二码本集合为所述用户设备从本地保存的第一码本集合 中选择的预编码矩阵组成的;
预编码单元 602,用于根据所述接收单元 601接收的索引从本地保存的 第三码本集合中查找所述第一预编码矩阵, 并根据所述第一预编码矩阵对 数据进行预编码, 其中, 所述第三码本集合与所述第二码本集合相同。 。
作为本发明另一实施例, 该基站还可以包括:
发送单元 603,用于向所述用户设备发送用于通知所述用户设备所述传 输信道承载 PMI 的能力的信令, 以使得所述用户设备根据所述传输信道承 载 PMI的能力, 从所述第一码本集合中选择预编码矩阵组成第二码本集合。
UE和基站也可以预先的预定不同传输信道承载 PMI的能力。
上述基站中个单元模块与用户设备的交互关系以及各单元功能的具体 实现方式, 可参照上述图 3及图 4对应的方法实施例中的描述。
本实施例, 基站可以根据需要设置用户设备的不同的传输信道的反馈 PMI的能力, 从而得到不同精度的 PMI.
需要特别说明的是, 以上全部或部分单元可以集成在芯片中实现。 在 本发明各个实施例中的各功能单元可以集成在一个处理模块中, 也可以是 各个单元单独物理存在, 也可以两个或两个以上单元集成在一个模块中。 上述集成的模块既可以采用硬件的形式实现, 也可以采用软件功能模块的 形式实现。 上述集成的模块如果以软件功能模块的形式实现并作为独立的 产品销售或使用时, 也可以存储在一个计算机可读取存储介质中。 上述提 到的存储介质可以是只读存储器, 磁盘或光盘等。
附图和相关描述只是为了说明本发明的原理, 并非用于限定本发明的 保护范围。 例如, 本发明各实施例中的消息名称和实体可以根据网络的不 同而有所变化, 一些消息也可以省略。 因此, 凡在本发明的精神和原则之 内所作的任何修改、 等同替换、 改进等, 均包含在本发明的保护范围内。
虽然通过参照本发明的某些优选实施例, 已经对本发明进行了图示和 描述, 但本领域的普通技术人员应该明白, 可以在形式上和细节上对其作 各种改变, 而不偏离本发明的精神和范围。

Claims

权利要求
1. 一种发送预编码矩阵索引 (PMI ) 的方法, 其特征在于,
用户设备从第二码本集合中选择第一预编码矩阵, 其中, 所述第二码 本集合为根据传输信道承载 PMI的能力设置的;
所述用户设备通过所述传输信道向基站发送所述第一预编码矩阵对应 的索引, 以使得所述基站根据所述索引查找所述第一预编码矩阵并根据所 述第一预编码矩阵对数据进行预编码。
2.根据权利要求 1 所述的方法, 其特征在于, 所述第二码本集合为所 述用户设备本地保存的第一码本集合的全部或子集。
3. 根据权利要求 1或 2所述的方法, 其特征在于, 所述第二码本集合 满足能够均匀划分信号空间的准则。
4. 根据权利要求 2或 3所述的方法, 其特征在于, 所述本地保存的第 一码本集合中任意一个预编码矩阵表示为 = ^ , 其中, , 为 Ntx2R的矩阵, W2为 2RxR的
Figure imgf000013_0002
Figure imgf000013_0001
矩阵; I为 RxR的单位阵, X是一个 RxR的对角阵, D为一个 Nt/2 xNt/2的 对角矩阵, A是一个 Nt/2 xR的矩阵, Λ是一个 RxR的对角矩阵, 其中, Nt 为偶数且表示所述基站的发送天线数目, R为所述预编码矩阵的秩。
5. 根据权利要求 4所述的方法, 其特征在于, 当所述 Nt=8,R=l, D为 4x4的单位矩阵, X是一个 1 x 1的对角阵, I为 1 x 1的单位阵, A为 4x 1的 矩阵, Λ为 1 x 1的单位矩阵时, 所述
Figure imgf000014_0001
6、 一种进行预编码的方法, 其特征在于, 包括:
基站接收用户设备通过传输信道发送的第一预编码矩阵对应的索引, 其中, 所述第一预编码矩阵为所述用户设备从第二码本集合中选择的, 所 述第二码本集合为根据所述传输信道承载 PMI的能力设置的;
所述基站根据所述索引从本地保存的第三码本集合中查找所述第一预 编码矩阵, 并根据所述第一预编码矩阵对数据进行预编码, 其中, 所述第 三码本集合与所述第二码本集合相同。
7、 根据权利要求 6所述的方法, 其特征在于, 所述第二码本集合为所 述用户设备保存的第一码本集合的全部或子集。
8. 根据权利要求 7或 8所述的方法, 其特征在于, 所述第二码本集合 满足能够均匀划分信号空间的准则。
9、 根据权利要求 7或 8所述的方法, 其特征在于, 所述第一码本集合 中任意一个预编码矩阵表示为 W = W^, 其中, W1 , 为 Ntx2R的矩阵, W2为 2RxR的
Figure imgf000014_0002
Figure imgf000014_0003
矩阵; I为 RxR的单位阵, X是一个 RxR的对角阵, D为一个 Nt/2 xNt/2的 对角矩阵, A是一个 Nt/2 xR的矩阵, Λ是一个 RxR的对角矩阵, 其中, Nt 为偶数且表示所述基站的发送天线数目, R为所述预编码矩阵的秩。
10. 根据权利要求 9所述的方法, 其特征在于, 当所述 Nt=8,R=l, D为 4x4的单位矩阵, X是一个 1 x1的对角阵, I为 1 x1的单位阵, A为 4x1的 矩阵, Λ为 1 x1的单位矩阵时, 所述 W1 =
Figure imgf000015_0001
11、 根据权利要求 6-10中任意一项所述的方法, 其特征在于, 在所述 基站接收用户设备通过传输信道发送的第一预编码矩阵对应的索引之前, 还包括:
所述基站向所述用户设备发送用于通知所述用户设备所述传输信道承 载 ΡΜΙ的能力的信令。
12、 一种用户设备, 其特征在于, 包括:
选择单元, 用于从第二码本集合中选择第一预编码矩阵, 其中, 所述 第二码本集合为根据所述传输信道承载 ΡΜΙ的能力设置的;
发送单元, 用于通过所述传输信道向基站发送所述第一预编码矩阵对 应的索引, 以使得所述基站根据所述索引查找所述第一预编码矩阵并根据 所述第一预编码矩阵对数据进行预编码。
13、 根据权利要求 11所述的用户设备, 其特征在于, 所述第二码本集 合为所述用户设备本地保存的第一码本集合的全部或子集。
14、 根据权利要求 12或 13所述的用户设备, 其特征在于, 所述第二 码本集合满足能够均匀划分信号空间的准则。
15、 一种基站, 其特征在于, 包括:
接收单元, 用于接收用户设备通过传输信道发送的第一预编码矩阵对 应的索引, 其中, 所述第一预编码矩阵为所述用户设备从第二码本集合中 选择的, 所述第二码本集合为根据所述传输信道承载 PMI的能力设置的; 预编码单元, 用于根据所述接收单元接收的索引从所述基站本地保存 的第三码本集合中查找所述第一预编码矩阵, 并根据所述第一预编码矩阵 对数据进行预编码, 其中, 所述第三码本集合与所述第二码本集合相同。
16、 根据权利要求 15所述的基站, 其特征在于, 所述第二码本集合为 所述用户设备本地保存的第一码本集合的全部或子集。
17、 根据权利要求 15所述的基站, 其特征在于, 所述第二码本集合满 足能够均匀划分信号空间的准则。
18、 根据权利要求 15-17中任意一项所述的基站, 其特征在于, 进一步 包括:
发送单元, 用于向所述用户设备发送用于通知所述用户设备所述传输 信道承载 PMI的能力的信令。
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