WO2010081412A1 - Procédé, système, équipement d'utilisateur et station de base pour un retour de précodage - Google Patents

Procédé, système, équipement d'utilisateur et station de base pour un retour de précodage Download PDF

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Publication number
WO2010081412A1
WO2010081412A1 PCT/CN2010/070146 CN2010070146W WO2010081412A1 WO 2010081412 A1 WO2010081412 A1 WO 2010081412A1 CN 2010070146 W CN2010070146 W CN 2010070146W WO 2010081412 A1 WO2010081412 A1 WO 2010081412A1
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WO
WIPO (PCT)
Prior art keywords
user equipment
base station
user
feedback threshold
noise ratio
Prior art date
Application number
PCT/CN2010/070146
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English (en)
Chinese (zh)
Inventor
王晓东
李斌
沈晖
罗毅
刘锋
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.)
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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 JP2011545617A priority Critical patent/JP5424222B2/ja
Publication of WO2010081412A1 publication Critical patent/WO2010081412A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients

Definitions

  • the present invention relates to mobile communication technologies, and in particular, to a precoding feedback method and system, a user equipment, and a base station. Background technique
  • MIMO Multiple Input Multiple Output
  • the precoding technique is based on the assumption that the transmitting end knows all or part of the channel state information. Therefore, in many cases, the receiving end needs to feed back the channel state information to the transmitting end.
  • random beamforming is a possible solution to reduce the amount of feedback.
  • random scheduling can make full use of multi-user diversity to improve system throughput.
  • the optimal and capacity expansion law is A ⁇ loglog, where ⁇ is the number of transmitting antennas on the base station side, which is the number of users.
  • ZF Zero Forcing
  • ORB Opportunistic Orthogonal Random Beamforming
  • the invention provides a precoding feedback method and system, a user equipment and a base station, which solve the problem of large feedback overhead.
  • An embodiment of the present invention provides a precoding feedback method, including:
  • the feedback optimal beam sets information of at least one beam having a signal to interference and noise ratio higher than the feedback threshold.
  • the embodiment of the invention provides a user equipment, including:
  • a receiving module configured to receive a random beam information stream, and determine an optimal beam set according to a signal to interference and noise ratio of the random beam information stream;
  • An obtaining module configured to obtain a feedback threshold
  • the feedback module is connected to the receiving module and the acquiring module, and is configured to feed back information of at least one beam whose signal to interference and noise ratio is higher than the feedback threshold.
  • An embodiment of the present invention provides a base station, including:
  • a calculation module configured to determine, according to at least one of a signal to interference and noise ratio distribution function, a total number of user equipments, and an environmental factor corresponding to each user equipment, a feedback threshold value for each user equipment; or a user according to a signal to interference and noise ratio distribution function, a user At least one of the total number of devices and the environmental factors corresponding to each user equipment obtains a feedback threshold for each user equipment; and obtains a common feedback threshold according to a predetermined policy and a feedback threshold for each user equipment;
  • the sending module is connected to the computing module, and is configured to send the feedback threshold of each user equipment or the common feedback threshold to the user equipment.
  • An embodiment of the present invention provides a precoding feedback system, including:
  • a base station configured to send a random beam information flow and threshold information to the user equipment
  • a user equipment connected to the base station, configured to acquire an optimal beam according to the random beam information And collecting, according to the threshold information, a feedback threshold, and feeding back information of at least one beam whose signal to interference and noise ratio is higher than a feedback threshold in the optimal beam set.
  • the threshold of the present invention can reduce the feedback overhead in the random beamforming scheme by setting the threshold value and feeding back the corresponding information when the signal to interference and noise ratio of the optimal beam exceeds the threshold.
  • FIG. 1 is a schematic flow chart of a method according to a first embodiment of the present invention
  • FIG. 2 is a schematic structural view of a first embodiment of the present invention
  • Embodiment 3 is a schematic flow chart of Embodiment 1 of a method for obtaining a feedback threshold in the first embodiment of the present invention
  • Embodiment 4 is a schematic flow chart of Embodiment 2 of a method for obtaining a feedback threshold in the first embodiment of the present invention
  • FIG. 5 is a schematic flow chart of Embodiment 3 of a method for obtaining a feedback threshold in the first embodiment of the present invention
  • FIG. 6 is a simulation relationship diagram of the total number of users and the capacity in the first embodiment of the present invention
  • FIG. 7 is a graph showing the relationship between the signal-to-noise ratio and the capacity in the first embodiment of the present invention
  • FIG. 9 is a schematic structural diagram of a user equipment according to a second embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a base station according to a third embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a precoding feedback system according to a fourth embodiment of the present invention. detailed description
  • an embodiment of the present invention includes: Step 11: The user equipment receives the random beam information stream, and determines an optimal beam set according to the signal to interference and noise ratio of the random beam information stream.
  • Step 12 The user equipment obtains the feedback threshold.
  • Steps 11, 12 have no timing constraints.
  • Step 13 The user equipment feeds back, to the base station, information about at least one beam whose signal to interference and noise ratio is higher than the feedback threshold in the optimal beam set.
  • the feedback threshold is obtained, and the feedback overhead is reduced when the signal to interference and noise ratio of the optimal beam of the user equipment is higher than the feedback threshold.
  • the base station has N, the root transmitting antenna, and there are a total of user equipments in the system, and each user equipment is equipped with N receiving antennas.
  • the base station is distributed according to isotropic
  • the information flow is statistically independent, and assume that the average transmit power of the daily lines is equal: E[
  • the Gaussian white noise of each user equipment is represented by G C xl , z k ⁇ C 0, I N ), and the received signal vector of each user equipment is , ⁇
  • the channel block H k is independent, and H t e CN(0, 1).
  • the signal-to-interference ratio 8 ⁇ und 1 of the mth information stream received by the first user equipment is expressed as follows: SINR t , K, w- ⁇ , ⁇ , N t
  • the optimal beam set is composed of a beam with the largest signal to interference and noise ratio; when the number of receiving antennas of the user equipment is greater than one, the signal is dry and noise according to the signal to interference and noise ratio from large to small.
  • the relatively large N beams constitute an optimal beam set, where N ⁇ Nr, Nr is the number of receiving antennas of each user equipment.
  • the feedback threshold is determined according to one or more of a signal to interference and noise ratio distribution function, a total number of user equipments, and environmental factors corresponding to each user equipment, or further determined according to a predetermined policy.
  • a signal to interference and noise ratio distribution function a total number of user equipments, and environmental factors corresponding to each user equipment, or further determined according to a predetermined policy.
  • FIG. 3 is a schematic flowchart of Embodiment 1 of a method for obtaining a feedback threshold in the first embodiment of the present invention.
  • a base station generates a threshold value corresponding to each user equipment for each user equipment.
  • this embodiment includes:
  • Step 301 The base station obtains a feedback threshold O t for each user equipment according to the total number of user equipments and different environmental factors of each user equipment (for example, path loss and shadow) and a signal to interference and noise ratio distribution function. .
  • the principle that the base station determines the threshold p( k ,f) according to the total number of user equipments K and y k is as follows:
  • the design is different for user equipments with different path loss and shadow.
  • Feedback thresholds can improve fairness, such as user equipment with more shadows and path loss, and feedback thresholds should be allocated lower, which can improve the fairness of the system.
  • the formula is determined according to the total number of user equipments, environmental factors, and the signal-to-noise ratio distribution function. In practical applications, the calculation formulas may be different, for example, only related to one or more of the above parameters.
  • Step 302 The base station sends the feedback threshold to the corresponding user equipment, and each user equipment obtains the feedback threshold for itself.
  • the feedback threshold value for each user equipment is calculated by the base station, and an appropriate threshold value may be determined according to different conditions of each user equipment.
  • FIG. 4 is a schematic flowchart of Embodiment 2 of a method for obtaining a feedback threshold in the first embodiment of the present invention.
  • a base station generates a common feedback threshold for each user equipment. Referring to Figure 4, this embodiment includes:
  • Step 401 The same as step 301 of the third embodiment, and details are not described herein again.
  • Step 402 The base station processes the feedback threshold for each user equipment according to a preset policy to obtain a common feedback threshold. For example, the feedback thresholds are averaged to obtain an average value.
  • Step 403 The base station sends a common feedback threshold to each user equipment, and each user equipment obtains the common feedback threshold.
  • the base station calculates the same feedback threshold for each user equipment, so that each user equipment can obtain an appropriate common threshold.
  • FIG. 5 is a schematic flowchart of Embodiment 3 of a method for obtaining a feedback threshold in the first embodiment of the present invention.
  • each user equipment pin generates a feedback threshold corresponding to itself.
  • this embodiment includes:
  • Step 501 The base station sends the total number of user equipments K and different environmental factors of each user equipment to each corresponding user equipment.
  • Step 502 Each user equipment obtains its own feedback threshold according to the foregoing information sent by the base station and the signal to interference and noise ratio distribution function. That is, each user equipment determines the threshold according to the total number of user equipments and ⁇
  • the information of the optimal beam is fed back (for example, the beam number); when the number of receiving antennas of the user equipment is greater than 1 Comparing the signal-to-noise ratio and the feedback threshold of the beam in the optimal beam set composed of the N beams, and feeding back the information of the beam in the N beams with the signal-to-noise ratio higher than the feedback threshold, where
  • the base station may further randomly select a user equipment from each user set, and schedule the user equipment to receive the information stream x m corresponding to the beam. Since they are mutually disjoint, this ensures that one user equipment is not allocated more than one beam.
  • the feedback amount can be reduced on the basis of obtaining the optimal and capacity expansion laws.
  • the effect is illustrated below in a simulation diagram.
  • the simulation basis of this embodiment is that the number of transmitting antennas is 4, and the number of receiving antennas of each user equipment is 1, the signal to noise ratio p It is 10dB.
  • the Dirty-Paper Coding (DPC) method is the optimal precoding method.
  • the other precoding methods are the optimal optimal zero-pre-coding method (Optim ZF) and the opportunity orthogonality.
  • Precoding method Opportunistic ORB
  • 1-bit feedback pre- A coding method (1-Bit Feedback
  • a 1-Bit ORB method based on an embodiment of the present invention. It can be seen from FIG.
  • the pre-coding method based on the present embodiment can achieve an optimal and capacity expansion law. It can be seen from FIG. 6 that when the total number of user equipments is small, the precoding method and the optimal precoding curve according to the embodiment of the present invention are also similar, that is, when the total number of user equipments is small, based on the embodiment of the present invention.
  • the precoding method can also have some better performance.
  • FIG. 7 is a simulation relationship diagram of signal-to-noise ratio and sum capacity in the first embodiment of the present invention.
  • the simulation basis of this embodiment is that the number of transmitting antennas is 4, and the number of receiving antennas N of each user equipment is 1, user equipment. The total is 100. It can be seen from Fig. 7 that the trend of each curve is also that the optimum and capacity law can be achieved in this embodiment when the signal-to-noise ratio changes.
  • FIG. 8 is a graph showing a simulation relationship between the total number of users and the feedback amount in the first embodiment of the present invention.
  • the curve from top to bottom shows the relationship between the total number of user equipments and the feedback amount when the number of transmitting antennas is 6, 5, 4, and 3 respectively.
  • the limit values at infinity are 61og6, 51og5, 41og4, 31og3, respectively, that is, the average feedback rate of this embodiment will be N t ⁇ o g N t .
  • the threshold-based feedback mechanism is not used in the prior art, and for each user, there is a maximum of min A ⁇ NJlogN, bit feedback, and the feedback bits of the entire system may reach Bit, so its feedback overhead is too large.
  • the average total feedback overhead is A ⁇ logN, bit. Compared with the feedback amount of the existing 1 ⁇ , ⁇ )1 0 ⁇ , the feedback amount can be greatly reduced.
  • FIG. 9 is a schematic structural diagram of a user equipment according to a second embodiment of the present invention, including a receiving module 91, an obtaining module 92, and a feedback module 93.
  • the receiving module 91 is configured to receive a random beam information stream, and determine an optimal beam set according to a signal to interference and noise ratio of each random beam information stream;
  • the obtaining module 92 is configured to obtain a feedback threshold value;
  • the feedback module 93 is configured to feedback the receiving module 91.
  • the optimal beam sets information of at least one beam whose signal to interference and noise ratio is higher than the feedback threshold obtained by the obtaining module 92.
  • the obtaining module 92 is specifically configured to receive a feedback threshold corresponding to the user equipment sent by the base station, and the feedback threshold corresponding to the user equipment is used by the base station according to a signal to interference and noise ratio distribution function, and the total user equipment. And determining at least one of an environmental factor corresponding to the user equipment; or, acquiring a module
  • the specific feedback threshold value is the same for each user equipment sent by the base station, and the common feedback threshold value for each user equipment is determined by the base station according to the signal to interference and noise ratio distribution function, the total number of user equipments, At least one of the environmental factors corresponding to the user equipment and the predetermined policy is determined; or the acquiring module 92 is specifically configured to receive the total number of user equipments and environmental factors sent by the base station, and the user equipment according to the signal to interference and noise ratio distribution function and the user equipment One of the total and environmental factors determines the feedback threshold.
  • the information of the optimal beam is fed back, and the feedback amount can be reduced.
  • FIG. 10 is a schematic structural diagram of a base station according to a third embodiment of the present invention, which includes a calculation module 101 and a sending module 102.
  • the calculation module 101 is configured to calculate a feedback threshold.
  • the sending module 102 is configured to send the feedback threshold obtained by the calculation module 101 to the user equipment, where the user equipment has at least one signal to interference and noise ratio higher than the feedback threshold. The information of the beam of values is fed back to the base station.
  • the calculation module 101 is specifically configured to determine a feedback threshold value for each user equipment according to at least one of a signal to interference and noise ratio distribution function, a total number of user equipments, and an environmental factor corresponding to each user equipment; or, the calculation module 101 is specifically used. Obtaining a feedback threshold value for each user equipment according to at least one of a signal to interference and noise ratio distribution function, a total number of user equipments, and an environmental factor corresponding to each user equipment; and according to a predetermined policy and a feedback threshold value for each user equipment Get a common feedback threshold.
  • the embodiment may further include a selection module, configured to receive beam information sent by each user equipment, to form a user set for each beam, and randomly select a user equipment in the user set corresponding to the same beam information, and the beam is selected. The data is sent to a randomly selected user device.
  • a selection module configured to receive beam information sent by each user equipment, to form a user set for each beam, and randomly select a user equipment in the user set corresponding to the same beam information, and the beam is selected. The data is sent to a randomly selected user device.
  • the feedback threshold is obtained by the calculation, and the feedback threshold is sent to the user equipment, so that the user equipment feedbacks when the signal to interference and noise ratio of the optimal beam is higher than the threshold, and the feedback amount can be reduced.
  • FIG. 11 is a schematic structural diagram of a precoding feedback system according to a fourth embodiment of the present invention, including a base station 111 and a user equipment 112.
  • the base station 111 is configured to send the beam information stream and the threshold information; the user equipment
  • the algorithm is configured to obtain an optimal beam set according to the random beam information sent by the base station 111, obtain a feedback threshold according to the threshold information sent by the base station 111, and feed back at least one signal to interference and noise ratio in the optimal beam set is higher than a feedback threshold.
  • the value of the beam information is configured to obtain an optimal beam set according to the random beam information sent by the base station 111, obtain a feedback threshold according to the threshold information sent by the base station 111, and feed back at least one signal to interference and noise ratio in the optimal beam set is higher than a feedback threshold.
  • the threshold information may be specifically a feedback threshold corresponding to each user equipment, and the base station 111 is specifically configured to determine, according to at least one of a signal to interference and noise ratio distribution function, a total number of user equipments, and an environmental factor corresponding to each user equipment, The feedback threshold is used by the user equipment 112 to receive the feedback threshold corresponding to the base station 111.
  • the threshold information may be specifically a feedback threshold value common to each user equipment
  • the base station 111 is specifically configured to determine, according to at least one of a signal to interference and noise ratio distribution function, a total number of user equipments, and an environmental factor corresponding to each user equipment, for each user.
  • a feedback threshold of the device, and a common feedback threshold is obtained according to a predetermined policy and a feedback threshold for each user equipment.
  • the user equipment 112 is specifically configured to receive the common publicity of each user equipment obtained by the base station 111. Feedback threshold.
  • the base station 111 is specifically configured to send the total number of user equipments and the environmental factors corresponding to the user equipments to the corresponding user equipments; the user equipment 112 according to the signal to interference and noise ratio distribution function, the total number of user equipments, and environmental factors sent by the base station 111 At least one of the determinations determines a respective feedback threshold.
  • the base station 111 is further configured to receive the beam information sent by each user equipment, and form a user set for each beam; and randomly select a user equipment in the user set corresponding to the same beam information, and send the data of the beam to the random Selected user device.
  • the feedback threshold is obtained in different manners.
  • the feedback of the optimal beam information can reduce the feedback amount.

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

Abstract

L'invention concerne un procédé, un système, un équipement d'utilisateur et une station de base pour un retour de précodage. Le procédé comprend les étapes suivantes : la réception de flux d'informations de faisceaux aléatoires; la détermination de l'ensemble de faisceaux optimal selon le rapport de signal sur interférence plus bruit (SINR) des flux d'informations de faisceaux aléatoires; l'obtention de la valeur de seuil de retour; le retour des informations d'au moins un faisceau, dont le SINR est supérieur à la valeur de seuil de retour, dans l'ensemble de faisceaux optimal. Le procédé peut diminuer la quantité de retour de précodage.
PCT/CN2010/070146 2009-01-15 2010-01-13 Procédé, système, équipement d'utilisateur et station de base pour un retour de précodage WO2010081412A1 (fr)

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Application Number Priority Date Filing Date Title
JP2011545617A JP5424222B2 (ja) 2009-01-15 2010-01-13 プリコーディングフィードバックのための方法、プリコーディングフィードバックシステム、ユーザ装置、および基地局

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CN 200910076683 CN101783776B (zh) 2009-01-15 2009-01-15 预编码反馈方法及系统、用户设备和基站
CN200910076683.8 2009-01-15

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CN102611536A (zh) * 2011-01-20 2012-07-25 夏普株式会社 信道状态信息反馈方法和用户设备
CN103795491B (zh) 2012-11-01 2019-01-15 中兴通讯股份有限公司 信道状态信息的处理方法、基站和终端
CN107370525B (zh) * 2016-05-12 2021-03-30 华为技术有限公司 用于信道状态信息反馈的方法、基站、终端设备及系统
EP3446416B1 (fr) 2016-05-13 2020-11-04 Huawei Technologies Co., Ltd. Précodage et acquisition d'informations d'état de canal pour des transmissions de multiples flux dans des systèmes mimo massifs
CN108353059A (zh) * 2016-05-13 2018-07-31 华为技术有限公司 一种信息反馈方法及站点
CN107342836B (zh) * 2017-03-17 2019-04-23 深圳大学 脉冲噪声下的加权稀疏约束稳健波束形成方法及装置
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CN113300989A (zh) * 2021-07-28 2021-08-24 四川创智联恒科技有限公司 一种nr-5g物理下行共享信道的快速实现方法

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CN101783776B (zh) 2013-04-24

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