WO2016163543A1 - 移動局、無線基地局及び無線通信方法 - Google Patents
移動局、無線基地局及び無線通信方法 Download PDFInfo
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- WO2016163543A1 WO2016163543A1 PCT/JP2016/061614 JP2016061614W WO2016163543A1 WO 2016163543 A1 WO2016163543 A1 WO 2016163543A1 JP 2016061614 W JP2016061614 W JP 2016061614W WO 2016163543 A1 WO2016163543 A1 WO 2016163543A1
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- precoding matrix
- base station
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- radio base
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
- H04B7/0469—Selection 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
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0478—Special codebook structures directed to feedback optimisation
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0478—Special codebook structures directed to feedback optimisation
- H04B7/0479—Special codebook structures directed to feedback optimisation for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]
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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
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
Definitions
- the present invention relates to a method for generating a precoding matrix, a radio base station and apparatus, and a mobile station. More specifically, the present invention designs a method, a radio base station and apparatus, and a mobile station for generating a precoding matrix for a multiple-input multiple-output (MIMO) system.
- MIMO multiple-input multiple-output
- MIMO technology improves capacity in wireless networks by arranging multiple antennas and transmitting data using diversity and multiplexing methods.
- a plurality of antennas arranged like a one-dimensional array are installed in a radio base station so that a plurality of user equipments (UE) can be distinguished in the horizontal dimension.
- UE user equipments
- a radio base station may be provided with four launch antennas for simultaneous communication with a plurality of UEs, and the four launch antennas are arranged like a 4 ⁇ 1 one-dimensional array. May be.
- UEs are located at different heights.
- a plurality of UEs are distributed on different floors of a building.
- a two-dimensional antenna array has been proposed, which makes it possible to expand spatial diversity in the vertical dimension.
- a conventional method for generating a precoding matrix relates to a one-dimensional antenna array.
- the newest 3GPP standard assumes that multiple antennas installed in a radio base station are distributed in the form of a uniform linear array (ULA), and based on this assumption Determine the codebook for the coding matrix.
- different one-dimensional antenna arrays are proposed, and currently a precoding matrix codebook is proposed for each of these different one-dimensional antenna arrays.
- 3GPP standard Rel. 8 a precoding matrix codebook for a 2 ⁇ 1 one-dimensional antenna array is proposed, and Rel. 10, a precoding matrix codebook for an 8 ⁇ 1 one-dimensional antenna array is proposed, and Rel. 12, a precoding matrix codebook for a 4 ⁇ 1 one-dimensional antenna array is proposed, but the configuration scheme of the precoding matrix codebook for these different one-dimensional antenna arrays is not the same. It is disadvantageous to arrange the array flexibly.
- One aspect of the mobile station of the present invention is a mobile station that performs communication using a plurality of antenna ports, and includes first quantity information indicating the antenna port quantity in the first dimension and antenna port quantity in the second dimension.
- a second receiving unit that receives second quantity information indicating a precoding matrix codebook index obtained using the first quantity information and / or the second quantity information, to the radio base station.
- a transmitting unit indicating a sampling rate for a beam transmitted in the first dimension
- second sampling rate information indicating a sampling rate for a beam transmitted in the second dimension
- the index of the precoding matrix codebook is obtained using the first sampling rate information and / or the second sampling rate information in addition to the first quantity information and / or the second quantity information.
- the transmission unit includes an index of the first precoding matrix codebook corresponding to the first dimension, an index of the second precoding matrix codebook corresponding to the second dimension, and a third precoding matrix. Codebook indexes can be sent.
- the first dimension can be the horizontal dimension of the radio base station antenna array
- the second dimension can be the vertical dimension of the radio base station antenna array.
- a method for generating a precoding matrix is provided, which is applied to a radio base station, and an antenna array is arranged in the radio base station.
- the method transmits antenna port total number information and horizontal quantity information and / or vertical quantity information to a mobile station, where the antenna port total number information indicates the total number of antenna ports of the antenna array, and the horizontal quantity information is an antenna.
- the antenna port quantity in the horizontal dimension of the array is indicated, and the vertical quantity information indicates the antenna port quantity in the vertical dimension of the antenna array, and the horizontal precoding index, vertical precoding index, and polarization pre- Receiving a coding index from the mobile station and generating a precoding matrix for the mobile station according to the received horizontal precoding index, vertical precoding index and polarization precoding index.
- a method for generating a precoding matrix is provided and applied to a mobile station.
- the method receives antenna port total number information and horizontal quantity information and / or vertical quantity information from the radio base station, and the antenna port total number information indicates the total number of antenna ports of the antenna array, and the horizontal quantity information is the antenna.
- the vertical quantity information indicating the number of antenna ports in the vertical dimension of the antenna array, the total number of received antenna ports, and the horizontal quantity information
- the antenna array used for the radio base station is determined, and the horizontal precoding matrix codebook, the vertical precoding matrix codebook and the polarization precoding matrix codebook are determined according to the determined antenna array.
- Generated and generated Rights precoding matrix codebook according vertical precoding matrix codebook and polarization precoding matrix codebook including, and generating a precoding matrix for a mobile station.
- a radio base station in which an antenna array is arranged transmits the total number of antenna ports information and the horizontal quantity information and / or vertical quantity information to the mobile station.
- the antenna port total number information indicates the total number of antenna ports of the antenna array
- the horizontal quantity information indicates the antenna port quantity in the horizontal dimension of the antenna array
- the vertical quantity information indicates the vertical of the antenna array.
- a transmitter configured to indicate an antenna port quantity in the dimension; a receiver configured to receive a horizontal precoding index, a vertical precoding index, and a polarization precoding index from a mobile station; Received horizontal precoding index, vertical precoding According index a polarization precoding index, including, precoding generation unit configured to generate a precoding matrix for a mobile station.
- a mobile station receives antenna port total number information and horizontal quantity information and / or vertical quantity information from a radio base station, and receives antenna port total number information.
- the mobile station receives antenna port total number information and horizontal quantity information and / or vertical quantity information from a radio base station, and receives antenna port total number information.
- Indicates the total number of antenna ports in the antenna array the horizontal quantity information indicates the antenna port quantity in the horizontal dimension of the antenna array
- the vertical quantity information indicates the antenna port quantity in the vertical dimension of the antenna array.
- An array determination configured to determine an antenna array to be used for the radio base station according to a receiver configured to be, and received antenna port total number information and horizontal quantity information and / or vertical quantity information And a precoding matrix codebook, a vertical precoding according to the determined antenna array
- a codebook generator configured to generate a coding matrix codebook and a polarization precoding matrix codebook, and a generated horizontal precoding matrix codebook, vertical precoding matrix codebook and polarization precoding matrix codebook
- a precoding matrix generator configured to generate a precoding matrix for the mobile station.
- a method for generating a precoding matrix for a two-dimensional antenna array is provided, and the method for generating the precoding matrix is provided for antenna arrays installed in different ways. Can be applied. Therefore, according to the embodiment of the present invention, the mobile station, that is, the UE can flexibly generate a codebook according to the antenna arrangement of the radio base station, and generates a precoding matrix for each different antenna arrangement. There is no need to establish a method.
- FIG. 3 is a flowchart describing a method for generating a precoding matrix, according to one embodiment of the invention.
- 6 is a flowchart describing a method for generating a precoding matrix according to another embodiment of the present invention. 6 is a flowchart illustrating a method for generating a precoding matrix for a UE according to an example of the present invention.
- FIG. 2 is an exemplary structural block diagram illustrating a radio base station according to one embodiment of the present invention.
- FIG. 2 is an exemplary structural block diagram illustrating a mobile station according to one embodiment of the present invention.
- FIG. 3 is an exemplary structural block diagram illustrating a precoding matrix generation unit according to an example of the present invention.
- FIG. 1 is a flowchart describing a method 100 for generating a precoding matrix, according to one embodiment of the present invention.
- the method 100 for generating a precoding matrix can be applied to a radio base station.
- an antenna array is arranged in the radio base station so as to perform diversity in the horizontal dimension and / or the vertical dimension of the spatial domain.
- FIG. 1 a method 100 for generating a precoding matrix according to one embodiment of the invention will be described.
- the radio base station notifies the UE of the antenna array installation method in the radio base station. Specifically, in step S101, antenna port (AP) total number information, horizontal quantity information and / or vertical quantity information are transmitted to the UE.
- the antenna port total number information indicates the antenna port total number of the antenna array
- the horizontal quantity information indicates the antenna port quantity in the horizontal dimension of the antenna array
- the vertical quantity information indicates the antenna port in the vertical dimension of the antenna array. The quantity is indicated.
- the horizontal quantity information may be the antenna port quantity in the horizontal dimension of the antenna array
- the vertical quantity information may be the antenna port quantity in the vertical dimension of the antenna array.
- a wireless base station may be provided with a 4 ⁇ 2 two-dimensional antenna array, in which four APs are installed in the horizontal dimension and two APs are installed in the vertical dimension.
- AP total number information having a value of 8 and horizontal quantity information having a value of 4 and / or vertical quantity information having a value of 2 are transmitted to the UE.
- AP total number information, horizontal quantity information and vertical quantity information are transmitted to the UE.
- the AP total number information and one of the horizontal quantity information and the vertical quantity information are transmitted to the UE.
- the UE first calculates another one of the horizontal quantity information and the vertical quantity information according to the received information, and determines the antenna array arrangement of the radio base station.
- the AP total number information and the horizontal quantity information and / or the vertical quantity information are periodically or aperiodically transmitted by RRC signaling to the UE connected to the radio base station.
- the information element IE
- the radio base station normally transmits RRC signaling with a period of 100 milliseconds and the transmission period is long, the radio base station may not meet the needs of the UE in a timely manner.
- AP total number information and horizontal quantity information and / or vertical quantity information may be notified by triggered physical layer signaling. Since this physical layer signaling can be triggered as needed, the radio base station notifies the UE more flexibly. For example, the information is notified in DCI physical layer signaling triggered for A-CSI.
- the horizontal quantity information and / or the vertical quantity information may be release information of a communication standard used for the radio base station.
- the UE determines the arrangement of the antenna array used for the radio base station according to the release information of the communication standard.
- the radio base station notifies the UE of the AP total number information of this radio base station and the release information of the communication standard used for it by a new PMI feedback setting signaling (PMI feedback configuration). For example, four antennas are installed in a radio base station, and Rel.
- a new PMI feedback setting signaling alternativeCodeBookEnabledFor4TX-r12 is transmitted to the UE. This signaling is performed by the radio base station using the 3GPP standard Rel.
- the UE has 4 antenna ports in the antenna array in the radio base station, and these 4 antennas are connected to Rel. 12 can determine that the antenna array is arranged in the radio base station, that is, Rel. 12 release confirms that the antenna array at the radio base station is a 4 ⁇ 1 one-dimensional array.
- the correspondence relationship between the precoding matrix codebook and the antenna array installation method in the radio base station may be installed in advance.
- the UE generates a precoding matrix codebook corresponding to the antenna array installation method according to the determined antenna array installation method in the radio base station.
- the UE generates a precoding matrix used by the UE according to the precoding matrix codebook, and feeds back the index of the indicated precoding matrix to the radio base station, whereby the radio base station To determine the precoding matrix used by this UE.
- a horizontal precoding index, a vertical precoding index, and a polarization precoding index are received from the UE.
- a precoding matrix for the UE is generated according to the received horizontal precoding index, vertical precoding index, and polarization precoding index.
- precoding matrix codebooks preinstalled in the radio base station and the UE are in accordance with a horizontal precoding matrix codebook, a vertical precoding matrix codebook, and a polarization precoding matrix codebook. Generated.
- the horizontal precoding index, the vertical precoding index, and the polarization precoding index are selected from the horizontal precoding matrix codebook, the vertical precoding matrix codebook, and the polarization precoding matrix codebook when generating the precoding matrix.
- a horizontal precoding matrix, a vertical precoding matrix, and a polarization precoding matrix are instructed to the UE, and a precoding matrix is generated.
- the antenna array can emit a plurality of beams in the vertical dimension, that is, can emit a plurality of vertical beams.
- the vertical precoding index may be an index of a vertical precoding matrix corresponding to a vertical beam having the largest antenna gain among a plurality of vertical beams detected by the UE.
- the radio base station determines to transmit a signal to the UE using only some of the vertical beams according to the prior information. In this case, it is preferable to notify the UE of the vertical beam selected by the radio base station, thereby simplifying the operation to be performed by the UE by inspecting only the vertical beam selected by the radio base station. Turn into.
- the first quantity of the vertical beams for communicating with the UE is determined, and the first quantity indicating the first quantity is indicated. Further comprising notifying the UE of quantity information, whereby the UE determines a vertical precoding index according to the first quantity of vertical beams.
- the first quantity information may be a confirmed first quantity of vertical beams for communicating with the UE. Instead, the first quantity information includes the total number of vertical beams that can be emitted by the antenna array without directly indicating the first quantity, and the sampling rate for the vertical beams.
- the UE determines a vertical beam to communicate with this UE according to the total number of vertical beams and the sampling rate for the vertical beam.
- the total number of vertical beams that can be emitted by the antenna array is 10.
- the radio base station decides to perform signal transmission with the UE using five of the ten vertical beams according to the prior information.
- the first quantity information may be the first quantity 5, or the total number 10 of vertical beams and the sampling rate 2 for the vertical beams.
- the antenna array can launch multiple beams in the horizontal dimension, that is, multiple horizontal beams.
- the horizontal precoding index may be an index of a horizontal precoding matrix corresponding to a horizontal beam detected by the UE and having the largest antenna gain among a plurality of horizontal beams.
- the radio base station determines to transmit a signal to the UE using only some of the horizontal beams according to the prior information. In this case, it is preferable to notify the UE of the horizontal beam selected by the radio base station, thereby simplifying the operation to be performed by the UE by checking only the horizontal beam selected by the radio base station. Turn into.
- a second quantity of horizontal beams for communicating with the UE is determined, and a second quantity indicating the second quantity is indicated. Further comprising notifying the UE of quantity information, whereby the UE determines a horizontal precoding index according to the second quantity of horizontal beams.
- the second quantity information may be a confirmed second quantity of a horizontal beam for communicating with the UE.
- the second quantity information includes the total number of horizontal beams that can be emitted by the antenna array without directly indicating the second quantity, and the sampling rate for the horizontal beams.
- the UE determines a horizontal beam to communicate with the UE according to the total number of horizontal beams and the sampling rate for the horizontal beam.
- the first quantity information and the second quantity information are notified to the UE connected to the radio base station periodically or aperiodically by RRC signaling.
- the first quantity information and the second quantity information may be notified by triggered physical layer signaling.
- the method for generating a precoding matrix according to the present embodiment is applied to antenna arrays installed in different ways. For example, this method applies not only to a one-dimensional antenna array, but also to a two-dimensional antenna array.
- the method of the present embodiment provides a possibility that the radio base station adjusts the antenna arrangement according to actual needs on the assumption that the process of generating the precoding matrix at the UE does not need to be changed.
- FIG. 2 is a flowchart describing a method 200 for generating a precoding matrix according to another embodiment of the present invention.
- the method 200 for generating a precoding matrix may be applied to a mobile station (ie, UE).
- the UE connects to a radio base station where the antenna array is located.
- a method 200 for generating a precoding matrix according to one embodiment of the invention will be described.
- step S201 AP total number information and horizontal quantity information and / or vertical quantity information are received from the radio base station.
- the AP total number information indicates the AP total number of the antenna array
- the horizontal quantity information indicates the AP quantity in the horizontal dimension of the antenna array
- the vertical quantity information indicates the AP quantity in the vertical dimension of the antenna array.
- the antenna array used for the radio base station is determined according to the received antenna port total number information and horizontal quantity information and / or vertical quantity information.
- the antenna array of the radio base station is determined directly according to the horizontal quantity information and the vertical quantity information in step S202. .
- step S201 when one of the horizontal quantity information and the vertical quantity information is received in step S201, first, in step S202, the received AP total number information and horizontal quantity are received. According to one of the information and the vertical quantity information, obtain another one of the horizontal quantity information and the vertical quantity information, and determine the antenna array of the radio base station according to the horizontal quantity information and the vertical quantity information. .
- step S202 when it is received in step S201 that the AP total number information is 8 and the horizontal quantity information is 4, in step S202, first, according to the AP total number information 8 and the horizontal quantity information 4, in the vertical dimension of the antenna array. It is determined that the AP quantity should be 2, that is, the vertical quantity information is 2, and the radio base station antenna array is a 4 ⁇ 2 two-dimensional antenna array according to the horizontal quantity information and the vertical quantity information. Confirm that there is.
- a horizontal precoding matrix codebook, a vertical precoding matrix codebook, and a polarization precoding matrix codebook are generated according to the determined antenna array.
- the correspondence relationship between the precoding matrix codebook and the antenna array installation method in the radio base station may be installed in advance.
- the UE generates a precoding matrix codebook corresponding to the antenna array installation method according to the determined antenna array installation method in the radio base station.
- the pre-installed precoding matrix codebook includes a horizontal precoding matrix codebook, a vertical precoding matrix codebook, and a polarization precoding matrix code corresponding to an antenna array installation method. Consists of books.
- the horizontal precoding matrix codebook, the vertical precoding matrix codebook, and the polarization precoding matrix codebook may be vectors in a discrete Fourier transform (DFT) format.
- DFT discrete Fourier transform
- a precoding matrix for the UE is generated according to the generated horizontal precoding matrix codebook, vertical precoding matrix codebook, and polarization precoding matrix codebook.
- various methods for generating a precoding matrix for a UE according to a horizontal precoding matrix codebook, a vertical precoding matrix codebook, and a polarization precoding matrix codebook are determined.
- FIG. 3 is a flowchart illustrating a method 300 for generating a precoding matrix for a UE according to one example of the present invention.
- step S301 by detecting the antenna gain of at least some of the plurality of vertical beams that can be emitted by the antenna array, the largest antenna gain of at least some of the vertical beams is obtained. Obtain a vertical precoding index corresponding to the vertical beam that has.
- a vertical precoding matrix is determined according to the vertical precoding index and the vertical precoding matrix codebook.
- the antenna array can launch multiple beams in the vertical dimension, that is, multiple vertical beams.
- the number of vertical beams that can be emitted by the antenna array installed in each system is stored in advance in the UE, or the number of vertical beams that can be emitted by a specific radio base station is notified to the UE.
- B may be the number of vertical beams that can be emitted by the determined antenna array.
- the antenna gains of all the plurality of vertical beams that can be emitted by the antenna array are detected, and the vertical beam having the largest antenna gain among all the plurality of vertical beams that can be emitted by the antenna array Determine the m value according to the corresponding vertical precoding index.
- the radio base station determines according to the prior information to transmit a signal to the UE using only some of the vertical beams, and The UE notifies the UE of the vertical beam selected by the radio base station.
- the first quantity information is received from the radio base station, and the first quantity information is included in the plurality of vertical beams. Further indicating a first quantity of vertical beams for communicating with the UE. B in the above formula (1) may be the first quantity indicated by the received first quantity information.
- step S301 only the antenna gain of the first quantity of vertical beams emitted from the antenna array is detected, and the vertical corresponding to the vertical beam having the largest antenna gain among the first quantity of vertical beams emitted from the antenna array. Determine the m value according to the precoding index. Therefore, the operation to be performed by the UE is simplified.
- step S303 by detecting the antenna gain of at least some of the plurality of horizontal beams that can be emitted by the antenna array, the largest antenna gain of at least some of the horizontal beams is detected.
- the antenna array can fire multiple beams in the horizontal dimension, that is, it can fire multiple horizontal beams.
- the number of horizontal beams that can be emitted by the antenna array installed in each system is stored in advance in the UE, or the number of vertical beams that can be emitted by a specific radio base station is notified to the UE.
- C may be the number of horizontal beams that can be emitted by the determined antenna array.
- the antenna gains of all the plurality of horizontal beams that can be emitted by the antenna array are detected in step S303, and n has the largest antenna gain among all the plurality of horizontal beams that can be emitted by the antenna array.
- the radio base station determines to transmit a signal to the UE using only some of the horizontal beams according to the prior information. And notifies the UE of the horizontal beam selected by the radio base station.
- the second quantity information is received from the radio base station, and the second quantity information is included in a plurality of vertical beams. It further includes indicating a second quantity of horizontal beams for communicating with the UE.
- C may be a second quantity indicated by the received second quantity information.
- step S303 only the antenna gain of the second quantity of horizontal beams emitted by the antenna array is detected, and n is the horizontal beam having the largest antenna gain among the second quantity of horizontal beams emitted by the antenna array. Corresponding horizontal precoding index. Therefore, the operation to be performed by the UE is simplified.
- a polarization precoding index is generated according to the determined antenna array.
- the polarization precoding index indicates a method of performing polarization in the UE. For example, when the UE performs horizontal polarization on the signal emitted from the antenna array, the value of k in the above equation (3) may be 1, and for the signal emitted by the UE from the antenna array When performing vertical polarization, the value of k in equation (3) may be 2.
- a polarization precoding matrix is generated according to the polarization precoding index and the polarization precoding matrix codebook.
- a precoding matrix for the UE is generated according to the horizontal precoding matrix, the vertical precoding matrix, and the polarization precoding matrix.
- the precoding matrix for the UE is generated according to the above formula (4) or (5).
- steps of the method shown in FIG. 3 are not necessarily performed in the order shown. Some steps may be performed in reverse or in parallel. For example, a step of detecting and generating a vertical precoding index, a step of detecting and generating a horizontal precoding index, and a step of generating a polarization precoding index can be performed simultaneously.
- the radio base station after generating the horizontal precoding index, the vertical precoding index, and the polarization precoding index, the radio base station generates a precoding matrix for the UE.
- the generated horizontal precoding index, vertical precoding index, and polarization precoding index are transmitted to the radio base station.
- the method for generating a precoding matrix according to the present embodiment is applied to antenna arrays installed in different ways. For example, this method applies not only to a one-dimensional antenna array, but also to a two-dimensional antenna array. Therefore, in the method for generating the precoding matrix according to the present embodiment, the UE can flexibly generate a codebook according to the antenna arrangement of the radio base station, and the UE preliminarily stores the precoding matrix for each different antenna arrangement. There is no need to determine how to generate.
- FIG. 4 is an exemplary structural block diagram illustrating a radio base station 400 according to one embodiment of the present invention.
- the radio base station 400 is provided with an antenna array (not shown).
- the radio base station 400 according to the present embodiment includes a transmission unit 410, a reception unit 420, and a precoding generation unit 430.
- Each unit of the radio base station 400 performs each step / function of the method 100 for generating the precoding matrix in FIG. Therefore, only the main components of the radio base station 400 will be described below, and the detailed contents described above by combining FIG. 1 will be omitted.
- the transmission unit 410 transmits antenna port (AP) total number information, horizontal quantity information and / or vertical quantity information to the UE.
- the antenna port total number information indicates the antenna port total number of the antenna array
- the horizontal quantity information indicates the antenna port quantity in the horizontal dimension of the antenna array
- the vertical quantity information indicates the antenna port in the vertical dimension of the antenna array. The quantity is indicated.
- the horizontal quantity information may be the antenna port quantity in the horizontal dimension of the antenna array
- the vertical quantity information may be the antenna port quantity in the vertical dimension of the antenna array.
- the transmission unit 410 transmits AP total number information, horizontal quantity information, and vertical quantity information to the UE.
- the transmission unit 410 may transmit one of AP total number information, horizontal quantity information, and vertical quantity information to the UE.
- the UE first calculates another one of the horizontal quantity information and the vertical quantity information according to the received information, and determines the antenna array arrangement of the radio base station.
- the transmission unit 410 is connected to the radio base station by using RRC signaling, periodically or aperiodically, the AP total number information and the horizontal quantity information and / or the vertical quantity information. Notify the UE.
- the information element (IE) is added to CSI-config RRC signaling to notify the information.
- the transmission unit 410 may notify the AP total number information and the horizontal quantity information and / or the vertical quantity information by triggered physical layer signaling. Good. Since this physical layer signaling can be triggered as needed, the radio base station notifies the UE more flexibly. For example, the information is notified in DCI physical layer signaling triggered for A-CSI.
- the horizontal quantity information and / or the vertical quantity information may be release information of a communication standard used for the radio base station.
- the UE determines the arrangement of the antenna array used for the radio base station according to the release information of the communication standard.
- the transmission unit 410 notifies the UE of the AP total number information of the radio base station 400 and the release information of the communication standard used therefor by new PMI feedback setting signaling.
- the correspondence relationship between the precoding matrix codebook and the antenna array installation method in the radio base station may be set in advance.
- the UE generates a precoding matrix codebook corresponding to the antenna array installation method according to the determined antenna array installation method in the radio base station.
- the UE generates a precoding matrix to be used by the UE according to the precoding matrix codebook, and feeds back an index indicating the precoding matrix to the radio base station, whereby the radio base station To determine the precoding matrix used by this UE.
- receiving section 420 receives a horizontal precoding index, a vertical precoding index, and a polarization precoding index from the UE.
- the precoding generation unit 430 generates a precoding matrix for the UE according to the received horizontal precoding index, vertical precoding index, and polarization precoding index.
- precoding matrix codebooks preinstalled in the radio base station 400 and the UE are a horizontal precoding matrix codebook, a vertical precoding matrix codebook, and a polarization precoding matrix codebook. Is generated according to The horizontal precoding index, the vertical precoding index, and the polarization precoding index are selected from the horizontal precoding matrix codebook, the vertical precoding matrix codebook, and the polarization precoding matrix codebook when generating the precoding matrix. A horizontal precoding matrix, a vertical precoding matrix, and a polarization precoding matrix are instructed to the UE, and a precoding matrix is generated.
- the antenna array of the radio base station 400 can emit a plurality of beams in the vertical dimension, that is, can emit a plurality of vertical beams.
- the vertical precoding index received by the receiving unit 420 may be an index of a vertical precoding matrix corresponding to a vertical beam having the largest antenna gain among a plurality of vertical beams detected by the UE.
- the radio base station 400 determines to transmit a signal to the UE using only some of the vertical beams according to the prior information.
- the transmission unit 410 notifies the UE of the vertical beam selected by the radio base station, whereby the UE inspects only the vertical beam selected by the radio base station, so that the UE Simplify operations to be performed.
- the radio base station 400 further includes a vertical beam selection unit that determines a first quantity of vertical beams for communicating with the UE among a plurality of vertical beams that can be emitted by the antenna array.
- the transmission unit 410 further notifies the UE of first quantity information indicating the first quantity so that the UE determines the vertical precoding index according to the first quantity of vertical beams.
- the first quantity information may be a confirmed first quantity of vertical beams for communicating with the UE.
- the first quantity information includes the total number of vertical beams that can be emitted by the antenna array without directly indicating the first quantity, and the sampling rate for the vertical beams.
- the UE determines a vertical beam to communicate with this UE according to the total number of vertical beams and the sampling rate for the vertical beam.
- the antenna array of the radio base station 400 can emit a plurality of beams in the horizontal dimension, that is, a plurality of horizontal beams can be emitted.
- the horizontal precoding index received by the receiving unit 420 may be an index of a horizontal precoding matrix corresponding to a horizontal beam having the largest antenna gain among a plurality of horizontal beams detected by the UE.
- the radio base station 400 determines to transmit a signal to the UE using only some of the horizontal beams according to the prior information.
- the transmission unit 410 notifies the UE of the horizontal beam selected by the radio base station, whereby the UE inspects only the horizontal beam selected by the radio base station, so that the UE Simplify operations to be performed.
- the radio base station 400 includes a horizontal beam selection unit that determines a second quantity of horizontal beams for communicating with the UE among a plurality of horizontal beams that can be emitted by the antenna array, and the transmission unit 410 includes: , Notify the UE of second quantity information indicating the second quantity so that the UE determines the horizontal precoding index according to the second quantity of horizontal beams.
- the second quantity information may be a confirmed second quantity of a horizontal beam for communicating with the UE.
- the second quantity information includes the total number of horizontal beams that can be emitted by the antenna array without directly indicating the second quantity, and the sampling rate for the horizontal beams.
- the UE determines a horizontal beam to communicate with the UE according to the total number of horizontal beams and the sampling rate for the horizontal beam.
- the transmission unit is connected to the radio base station with the first quantity information and the second quantity information periodically or aperiodically by RRC signaling.
- the first quantity information and the second quantity information may be notified by triggered physical layer signaling instead.
- the radio base station flexibly generates a precoding matrix codebook and a precoding matrix used in the UE for antenna arrays installed in different schemes. Therefore, the radio base station can adjust the antenna arrangement according to actual needs, and does not need to change the process of generating the precoding matrix at the UE.
- FIG. 5 is an exemplary structural block diagram illustrating a mobile station 500 according to one embodiment of the present invention.
- Mobile station 500 is connected to a radio base station in which an antenna array is arranged.
- the mobile station 500 of this embodiment includes a receiving unit 510, an array determining unit 520, a codebook generating unit 530, and a precoding matrix generating unit 540.
- Each part of the mobile station 500 performs each step / function of the method 200 for generating the precoding matrix in FIG. For this reason, hereinafter, only main components of the mobile station 500 will be described, and the detailed contents described above by combining FIG. 2 will be omitted.
- the receiving unit 510 receives antenna port (AP) total number information, horizontal quantity information and / or vertical quantity information from the radio base station.
- the AP total number information indicates the AP total number of the antenna array
- the horizontal quantity information indicates the AP quantity in the horizontal dimension of the antenna array
- the vertical quantity information indicates the AP quantity in the vertical dimension of the antenna array. Is.
- the array determining unit 520 determines the antenna array used for the radio base station according to the received antenna port total number information and horizontal quantity information and / or vertical quantity information.
- the array determination unit 520 when the receiving unit 510 receives the horizontal quantity information and the vertical quantity information, the array determination unit 520 directly determines the antenna array of the radio base station according to the horizontal quantity information and the vertical quantity information. Determine. Further, according to another example of the present invention, when the receiving unit 510 receives one of the horizontal quantity information and the vertical quantity information, the array determination unit 520 first receives the AP total number information received and According to one of the horizontal quantity information and the vertical quantity information, obtain another one of the horizontal quantity information and the vertical quantity information, and according to the horizontal quantity information and the vertical quantity information, set the antenna array of the radio base station. Determine.
- the code book generation unit 530 generates a horizontal precoding matrix codebook, a vertical precoding matrix codebook, and a polarization precoding matrix codebook according to the determined antenna array. As described above, the correspondence relationship between the precoding matrix codebook and the antenna array installation method in the radio base station may be installed in advance.
- the code book generation unit 530 generates a precoding matrix code book corresponding to the antenna array installation method according to the determined antenna array installation method in the radio base station.
- the pre-installed precoding matrix codebook includes a horizontal precoding matrix codebook, a vertical precoding matrix codebook, and a polarization precoding matrix associated with the antenna array installation method. Consists of a code book.
- the horizontal precoding matrix codebook, the vertical precoding matrix codebook, and the polarization precoding matrix codebook may be vectors in a discrete Fourier transform (DFT) format.
- DFT discrete Fourier transform
- the precoding matrix generation unit 540 generates a precoding matrix for the UE according to the generated horizontal precoding matrix codebook, vertical precoding matrix codebook, and polarization precoding matrix codebook.
- the precoding matrix generation unit 540 determines various methods for generating a precoding matrix for a UE according to a horizontal precoding matrix codebook, a vertical precoding matrix codebook, and a polarization precoding matrix codebook according to different needs. To do.
- FIG. 6 is an exemplary structural block diagram illustrating a precoding matrix generator 540 according to one example of the present invention. As shown in FIG. 6, the precoding matrix generation unit 540 includes a vertical precoding matrix determination module 610, a horizontal precoding matrix determination module 620, a polarization precoding matrix determination module 630, and a precoding matrix generation module 640.
- the mobile station 500 includes a detection unit.
- the detection unit detects the antenna gain of at least some of the plurality of vertical beams that can be emitted by the antenna array, thereby supporting the vertical beam having the largest antenna gain among at least some of the vertical beams.
- Get vertical precoding index Then, the vertical precoding matrix determination module 610 determines the vertical precoding matrix according to the vertical precoding index and the vertical precoding matrix codebook.
- the antenna array can launch multiple beams in the vertical dimension, that is, multiple vertical beams.
- the number of vertical beams that can be emitted by the antenna array installed in each system is stored in advance in the UE, or the number of vertical beams that can be emitted by a specific radio base station is notified to the UE.
- B may be the number of vertical beams that can be emitted by the determined antenna array.
- the detection unit detects the antenna gain of all the plurality of vertical beams that can be emitted by the antenna array, and selects the vertical beam having the largest antenna gain among all the plurality of vertical beams that can be emitted by the antenna array. Determine the m value according to the corresponding vertical precoding index.
- the radio base station determines according to the prior information to transmit a signal to the UE using only some of the vertical beams, and The UE notifies the UE of the vertical beam selected by the radio base station.
- the receiving unit 510 further receives the first quantity information from the radio base station, and the first quantity information is received from the UE among the plurality of vertical beams. It indicates the first quantity of vertical beams for communication.
- B in the above formula (1) may be the first quantity indicated by the received first quantity information.
- the detection unit detects only the antenna gain of the first quantity of vertical beams emitted from the antenna array, and corresponds to the vertical beam having the largest antenna gain among the first quantity of vertical beams emitted from the antenna array. Determine the m value according to the precoding index. Therefore, the operation to be performed by the UE is simplified.
- the horizontal precoding matrix determination module 620 can perform operations in the horizontal dimension similar to the above operations performed in the vertical dimension by the vertical precoding matrix determination module 610. Specifically, the detection unit detects the antenna gain of at least some of the plurality of horizontal beams that can be emitted by the antenna array, so that the horizontal gain having the largest antenna gain among at least some of the horizontal beams. Obtain a horizontal precoding index corresponding to the beam. The horizontal precoding matrix determination module 620 determines a horizontal precoding matrix according to the horizontal precoding index and the horizontal precoding matrix codebook.
- the antenna array can fire multiple beams in the horizontal dimension, that is, it can fire multiple horizontal beams.
- the number of horizontal beams that can be emitted by the antenna array installed in each system is stored in advance in the UE, or the number of vertical beams that can be emitted by a specific radio base station is notified to the UE.
- C may be the number of horizontal beams that can be emitted by the determined antenna array.
- the detection unit detects the antenna gains of all the plurality of horizontal beams that can be emitted by the antenna array, and selects the horizontal beam having the largest antenna gain among all the plurality of horizontal beams that can be emitted by the antenna array.
- the radio base station determines according to the prior information to transmit a signal to the UE using only some of the horizontal beams.
- the horizontal beam selected by the radio base station is notified to the UE.
- the receiving unit 510 further receives the second quantity information from the radio base station.
- the second quantity information indicates a second quantity of horizontal beams for communicating with the mobile station among the plurality of vertical beams.
- C may be a second quantity indicated by the received second quantity information.
- the detection unit detects only the antenna gain of the second quantity of horizontal beams emitted from the antenna array, and corresponds to the horizontal beam having the largest antenna gain among the second quantity of horizontal beams emitted from the antenna array. Determine the value of n according to the precoding index. Therefore, the operation to be performed by the UE is simplified.
- the detection unit generates a polarization precoding index according to the determined antenna array.
- the polarization precoding index indicates a method of performing polarization in the UE. For example, when the UE performs horizontal polarization on the signal emitted from the antenna array, the value of k in the above equation (3) may be 1, and for the signal emitted by the UE from the antenna array When performing vertical polarization, the value of k in equation (3) may be 2.
- the polarization precoding matrix determination module 630 generates a polarization precoding matrix according to the determined antenna array.
- the precoding matrix generation module 640 generates a precoding matrix for the mobile station according to the horizontal precoding matrix, the vertical precoding matrix, and the polarization precoding matrix. For example, the precoding matrix generation module 640 generates a precoding matrix for the mobile station according to the above formula (4) or (5).
- the mobile station 500 shown in FIG. 5 includes a transmission unit. After generating the horizontal precoding index, the vertical precoding index, and the polarization precoding index, the transmitting unit generates the generated horizontal precoding index so that the radio base station generates a precoding matrix for the mobile station, The vertical precoding index and the polarization precoding index are transmitted to the radio base station.
- the mobile station according to the embodiment of the present invention can flexibly generate a codebook according to the antenna arrangement of the radio base station, and the mobile station needs to determine a method for generating a precoding matrix for each different antenna arrangement in advance. Absent.
- the operations of the radio base station 400 and the mobile station 500 may be realized by hardware, may be realized by a software module executed by a processor, or may be realized by combining both.
- the software module may be arranged in a storage medium of any format, for example, RAM (random access memory), flash memory, ROM (read only memory), EPROM (erasable programmable ROM), EEPROM (electrically erasable program). ROM), register, hard disk, removable disk, and CD-ROM.
- RAM random access memory
- flash memory ROM (read only memory)
- EPROM erasable programmable ROM
- EEPROM electrically erasable program
- register hard disk, removable disk, and CD-ROM.
- the storage medium is connected to the processor so that the processor writes information to the storage medium or reads information from the storage medium.
- This storage medium may be installed in the processor.
- the storage medium and the processor may be arranged in the ASIC.
- This ASIC may be arranged in the base station apparatus 400 and the mobile station 500.
- the storage medium and the processor may be arranged in the base station device 400 and the mobile station 500 as discrete components.
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Abstract
Description
Claims (8)
- 複数のアンテナポートを利用して通信を行う移動局であって、
第1の次元におけるアンテナポート数量を示す第1数量情報及び第2の次元におけるアンテナポート数量を示す第2数量情報を無線基地局から受信する受信部と、
前記第1数量情報及び/又は前記第2の数量情報を用いて取得したプリコーディング行列コードブックのインデックスを前記無線基地局に送信する送信部と、を含む移動局。 - 前記受信部は、前記第1の次元で送信されるビームに対するサンプリングレートを示す第1のサンプリングレート情報と、前記第2の次元で送信されるビームに対するサンプリングレートを示す第2のサンプリングレート情報と、を受信し、前記プリコーディング行列コードブックのインデックスは、前記第1の数量情報及び/又は前記第2の数量情報に加えて、前記第1のサンプリングレート情報及び/又は前記第2のサンプリングレート情報を用いて取得する請求項1に記載の移動局。
- 前記送信部は、前記第1の次元に対応する第1のプリコーディング行列コードブックのインデックスと、前記第2の次元に対応する第2のプリコーディング行列コードブックのインデックスと、第3のプリコーディング行列コードブックのインデックスと、を送信する請求項1又は請求項2に記載の移動局。
- 前記受信部は、前記無線基地局が送信可能となる複数ビームの中から選択された一部のビームを選択的に受信する請求項1から請求項3のいずれかに記載の移動局。
- 前記第1の次元は前記無線基地局のアンテナアレイの水平次元であり、前記第2の次元は前記無線基地局のアンテナアレイの垂直次元である請求項1から請求項4のいずれかに記載の移動局。
- 前記第1のプリコーディング行列コードブックのインデックスは、水平プリコーディング行列コードブックのインデックスであり、前記第2のプリコーディング行列コードブックのインデックスは、垂直プリコーディング行列コードブックのインデックスであり、前記第3のプリコーディング行列コードブックのインデックスは、偏波プリコーディング行列コードブックのインデックスである請求項3に記載の移動局。
- 複数のアンテナポートを利用して移動局と通信を行う無線基地局であって、
第1の次元におけるアンテナポート数量を示す第1数量情報及び第2の次元におけるアンテナポート数量を示す第2数量情報を移動局に送信する送信部と、
前記第1数量情報及び/又は前記第2の数量情報を用いて前記移動局が取得したプリコーディング行列コードブックのインデックスを前記移動局から受信する受信部と、を含む無線基地局。 - 複数のアンテナポートを利用して通信を行う移動局の通信方法であって、
第1の次元におけるアンテナポート数量を示す第1数量情報及び第2の次元におけるアンテナポート数量を示す第2数量情報を無線基地局から受信する工程と、
前記第1数量情報及び/又は前記第2の数量情報を用いて取得したプリコーディング行列コードブックのインデックスを前記無線基地局に送信する工程と、を有することを特徴とする無線通信方法。
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EP16776709.4A EP3282610A4 (en) | 2015-04-09 | 2016-04-08 | Mobile station, wireless base station, and wireless communications method |
JP2017511107A JP6301553B2 (ja) | 2015-04-09 | 2016-04-08 | 移動局、無線基地局及び無線通信方法 |
BR112017021074A BR112017021074A2 (pt) | 2015-04-09 | 2016-04-08 | estação móvel, estação base de rádio, e método de comunicação via rádio |
CN201680020764.4A CN107534507B (zh) | 2015-04-09 | 2016-04-08 | 移动台、无线基站以及无线通信方法 |
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