WO2018006355A1 - Procédé de sélection de valeur de poids de transmission, et station de base - Google Patents

Procédé de sélection de valeur de poids de transmission, et station de base Download PDF

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Publication number
WO2018006355A1
WO2018006355A1 PCT/CN2016/089162 CN2016089162W WO2018006355A1 WO 2018006355 A1 WO2018006355 A1 WO 2018006355A1 CN 2016089162 W CN2016089162 W CN 2016089162W WO 2018006355 A1 WO2018006355 A1 WO 2018006355A1
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WO
WIPO (PCT)
Prior art keywords
reference signal
transmission weight
beams
signal received
terminal
Prior art date
Application number
PCT/CN2016/089162
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English (en)
Chinese (zh)
Inventor
杨亥娟
杨烨
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201680087438.5A priority Critical patent/CN109429549A/zh
Priority to PCT/CN2016/089162 priority patent/WO2018006355A1/fr
Publication of WO2018006355A1 publication Critical patent/WO2018006355A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas

Definitions

  • the present application relates to the field of communications, and in particular, to a method for selecting a transmission weight and a base station.
  • FIG. 1 is a schematic diagram of communication between a base station and a terminal using beamforming.
  • the base station sends a data signal to the terminal by using a narrow beam.
  • the beamforming technique is currently only used in the transmission of data signals, and cannot be used for the transmission of downlink control signals, that is, the downlink control signals cannot be transmitted using narrow beams.
  • the present application provides a method for selecting a transmission weight and a base station, and aims to solve the problem that the beamforming technology cannot be used to transmit a downlink control signal.
  • a first aspect of the present application provides a method for selecting a transmission weight, comprising the steps of: determining, by a base station, a transmission weight of each of a plurality of beams, and estimating that each of the plurality of beams is used
  • the transmission weight transmits a downlink control signal to the terminal
  • the reference signal fed back by the terminal receives power.
  • the base station further receives the power according to the reference signal, selects a target transmission weight from the transmission weights, and determines a transmission weight for the terminal according to the target transmission weight.
  • the transmission weight for the terminal is determined according to the reference signal received power, and the reference signal received power can reflect the quality of the downlink control channel
  • the selection of the transmission weight takes into consideration the channel quality of the downlink control channel, so that the narrow beam transmission is used. Downlink control signals are possible, and the coverage of the control channel can be increased.
  • a second aspect of the present application provides a base station including a memory and a processor.
  • the memory is used to store an application and data generated during the running of the application, and the processor is configured to execute an application in the memory to implement a function of: determining a transmission right of each of the plurality of beams a value, and, estimating, using each of the plurality of beams
  • the transmission weight of the bundle transmits the downlink control signal to the terminal
  • the reference signal received by the terminal receives the power
  • the target transmission weight is selected from the transmission weight according to the received power of the reference signal, and according to the The target transmission weight determines a transmission weight for the terminal.
  • the specific implementation manner of selecting a target transmission weight from the transmission weight according to the received power of the reference signal is: acquiring a reference signal received power set, where the reference signal receiving power set includes Receiving power of a reference signal of at least two beams sorted in a preset order, the at least two beams being a subset of the plurality of beams, and transmitting the beam corresponding to a local extremum in the set of received power signals The weight is used as the target transmission weight.
  • the specific implementation manner of the reference signal receiving power set is: adding reference signal receiving power that meets a preset condition among the reference signal receiving powers of the multiple beams to the reference signal receiving power set,
  • the preset condition includes a difference from a maximum value of the reference signal received power of the multiple beams within a preset range.
  • the specific implementation manner of determining a transmission weight of each of the plurality of beams is: determining a transmission weight of the multiple beams according to a preset constraint, where the preset condition includes The ratio of the error generated by the terminal demodulating the downlink control signal to the downlink control signal received by the terminal is not less than a preset value; and the power of the downlink control signal received by the terminal is greater than zero. Since the preset constraint introduces the influence of the CRS into the process of determining the transmission weight, the obtained transmission weight can control the error caused by the channel vector mismatch within a range that can be received, thus making use of It is possible to transmit downlink control signals in a narrow beam.
  • the preset condition further includes: the power of the single transmit antenna is not greater than a preset value, and the preset value is determined according to the number of transmit antennas. The goal is to have the beam overlap overlap within the coverage of the cell.
  • FIG. 1 is a schematic diagram of a base station transmitting a control signal and a data signal to a terminal;
  • FIG. 2 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 selecting a transmission weight according to an embodiment of the present invention.
  • the present application proposes that the base station uses the beamforming technology to send a downlink control signal to the terminal, that is, the base station first determines the weight set of the beam according to the CRS, and then according to the quality of the downlink control channel, the weight is determined.
  • a plurality of weights are collectively selected to be combined into a transmission weight of the downlink control signal to use a transmission weight and transmit a downlink control signal to the terminal through multiple antennas.
  • FIG. 2 is a schematic structural diagram of a base station shown in FIG. 1, wherein the base station includes a memory and a processor, and optionally, a transmitter, a receiver, and a modem (not shown) that are commonly provided by the base station.
  • the memory is used to store the application and the data generated during the running of the application, and the processor is used to run the application stored in the memory to implement the process shown in FIG.
  • FIG. 3 is a method for selecting a transmission weight according to an embodiment of the present application, including the following steps:
  • the base station determines, according to a preset constraint, a transmission weight of each of the multiple beams used to cover the cell.
  • the preset constraints include:
  • Constraint condition 1 The ratio of the error generated by the terminal demodulation downlink control signal to the downlink control signal received by the terminal is not less than a preset value.
  • H( ⁇ ) is the coefficient of the control channel.
  • wcrs is the transmission weight of the CRS for covering the cell, and then the downlink control signal passes through the control channel before entering the terminal.
  • the expression is H( ⁇ ) H w . If the expression of the terminal is w crs H( ⁇ ), the expression of the downlink control signal after demodulation by the terminal is:
  • the demodulated signal represents the terminal and the signal H ( ⁇ ) received error between H w, i.e., the terminal demodulates the downlink control signals generated Error, which is caused by the channel vector mismatch that occurs during the process of the terminal using the CRS to demodulate the received downlink control signal H( ⁇ ) H w .
  • the ratio of the error generated by the terminal demodulating the downlink control signal to the downlink control signal received by the terminal can be expressed as:
  • the preset value is among them.
  • the unit is degree, the smaller the value, the better, the maximum can not exceed 45 degrees, in practice, the empirical value is generally used.
  • the first preset constraint condition is expressed as:
  • the first constraint is determined according to the transmission weight wcrs of the CRS used to cover the cell.
  • Constraint 2 The power of the downlink control signal received by the terminal is greater than zero. That is to say, it is necessary to ensure that the terminal can receive the downlink control signal.
  • the real part of the signal demodulated by the terminal for H( ⁇ ) H w represents the energy of the signal entering the terminal. Therefore, the second preset condition is expressed as:
  • the transmit power of the antenna may be restricted.
  • the preset constraints further include:
  • S301 can obtain the transmission weights of multiple beams used to cover the cell by calculating the solution of the following equation:
  • f(w) is a beamforming criterion function
  • the output thereof is the transmission weight of each beam when the downlink control channel is beamformed.
  • the terminal uses a Cell-Specific Reference Signal (CRS) to demodulate the downlink control signal, and the base station can only use the wide beam at the cell level to ensure coverage of all terminals in the cell.
  • CRS Cell-Specific Reference Signal
  • Send CRS If a downlink control signal is sent by using a narrow beam, the downlink control signal received by the terminal does not match the beam width of the CRS, and thus the terminal may cause channel vector mismatch in the process of demodulating the downlink control signal, thereby reducing terminal demodulation. performance.
  • the base station determines the transmission weights of multiple beams covering the cell according to w crs , that is, introduces the influence of the CRS into the process of determining the transmission weight, so
  • the transmission weight can control the error caused by the channel vector mismatch within a range that can be received, thus making it possible to transmit the downlink control signal using a narrow beam.
  • the number of beams that is, the number of transmit weights, may be determined according to formula (5):
  • the specific process is as follows:
  • the base station uses the channel coefficient of the predetermined downlink control channel to estimate the reference signal receiving power that the terminal may feed back when using the transmission weight determined in S301 to transmit the downlink control signal to the terminal.
  • RSRP RSRP
  • the base station does not actually transmit the downlink control signal to the terminal, but uses the channel coefficient of the downlink control channel to estimate the RSRP that the terminal may feed back the downlink control signal.
  • the base station determines a candidate weight set: adding a transmission weight of the beam with the largest RSRP (referred to as RSRPmax) (referred to as Beam max ) to the candidate weight set, and the difference between the RSRP and the RSRP max is within a preset range Thd rsrp
  • the base station adds the weights in the BEAM tx and performs normalization processing to obtain the transmission weight of the terminal.
  • the base station may use the foregoing determined transmission weight to transmit a downlink control signal of the narrow beam to each terminal through each of the plurality of antennas, thereby implementing the purpose of transmitting the downlink control signal by using the beamforming technology.
  • the method shown in FIG. 3 can select an appropriate transmission weight according to the channel quality of the terminal (reflected by RSRP), and use the beamforming to transmit a downlink control signal to the terminal, so that the lower transmission power can be used.
  • the coverage of the control channel is increased, and since the determination of the weight of the beam for covering the cell is based on the beam width of the CRS, the demodulation performance of the terminal can also be guaranteed.

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

Abstract

L'invention concerne un procédé de sélection d'une valeur de poids de transmission, et une station de base. Une station de base détermine une valeur de poids de transmission de chaque faisceau d'une pluralité de faisceaux et estime une puissance de réception de signal de référence renvoyée par un terminal lorsqu'un signal de commande de liaison descendante est transmis au terminal à l'aide de la valeur de poids de transmission de chaque faisceau de la pluralité de faisceaux. La station de base sélectionne ensuite une valeur de poids de transmission cible à partir de la valeur de poids de transmission d'après la puissance de réception de signal de référence, et détermine une valeur de poids de transmission pour le terminal d'après la valeur de pondération de transmission cible. Comme une valeur de poids de transmission pour un terminal est déterminée d'après la puissance de réception de signal de référence et que la puissance de réception de signal de référence peut refléter la qualité d'un canal de commande de liaison descendante, la sélection de la valeur de poids de transmission prend en compte la qualité de canal du canal de commande de liaison descendante, il est possible d'utiliser un faisceau étroit pour transmettre un signal de commande de liaison descendante, et la plage de couverture du canal de commande peut être augmentée.
PCT/CN2016/089162 2016-07-07 2016-07-07 Procédé de sélection de valeur de poids de transmission, et station de base WO2018006355A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201680087438.5A CN109429549A (zh) 2016-07-07 2016-07-07 发射权值选择方法及基站
PCT/CN2016/089162 WO2018006355A1 (fr) 2016-07-07 2016-07-07 Procédé de sélection de valeur de poids de transmission, et station de base

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Application Number Priority Date Filing Date Title
PCT/CN2016/089162 WO2018006355A1 (fr) 2016-07-07 2016-07-07 Procédé de sélection de valeur de poids de transmission, et station de base

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CN110858995A (zh) * 2018-08-24 2020-03-03 北京松果电子有限公司 数据发射功率的控制方法、装置、存储介质及用户设备
CN111884694A (zh) * 2020-07-28 2020-11-03 中国联合网络通信集团有限公司 波束赋形控制方法、装置、电子设备及存储介质
WO2023246454A1 (fr) * 2022-06-23 2023-12-28 中兴通讯股份有限公司 Procédé et appareil de commande de faisceau de station de base et support de stockage lisible par ordinateur

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US11012133B2 (en) * 2019-09-16 2021-05-18 Nokia Solutions And Networks Oy Efficient data generation for beam pattern optimization

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CN101494484A (zh) * 2008-01-24 2009-07-29 中兴通讯股份有限公司 下行波束形成方法
CN103634037A (zh) * 2012-08-28 2014-03-12 中兴通讯股份有限公司 波束成形方法及装置
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WO2023246454A1 (fr) * 2022-06-23 2023-12-28 中兴通讯股份有限公司 Procédé et appareil de commande de faisceau de station de base et support de stockage lisible par ordinateur

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