WO2011157217A1 - Procédé et système adaptés pour obtenir des informations de voie, et station de base - Google Patents

Procédé et système adaptés pour obtenir des informations de voie, et station de base Download PDF

Info

Publication number
WO2011157217A1
WO2011157217A1 PCT/CN2011/075779 CN2011075779W WO2011157217A1 WO 2011157217 A1 WO2011157217 A1 WO 2011157217A1 CN 2011075779 W CN2011075779 W CN 2011075779W WO 2011157217 A1 WO2011157217 A1 WO 2011157217A1
Authority
WO
WIPO (PCT)
Prior art keywords
codebook
matrix indicator
precoding matrix
index
base station
Prior art date
Application number
PCT/CN2011/075779
Other languages
English (en)
Chinese (zh)
Inventor
李儒岳
陈艺戬
徐俊
闫文俊
徐前子
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2011157217A1 publication Critical patent/WO2011157217A1/fr

Links

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
    • H04B7/06—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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • 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
    • H04B7/0658—Feedback reduction

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a base station, and a channel information acquisition method and system.
  • a transmitting end and a receiving end use a plurality of antennas to obtain a higher rate in a spatial multiplexing manner.
  • an enhanced technology is that the receiving end feeds back the channel information of the transmitting end, and the transmitting end uses the transmitting precoding technology according to the obtained channel information, which can greatly improve the transmission performance.
  • SU-MIMO Single User Multi-input Multi-output
  • channel feature vector information is used for precoding directly; in multi-user multi-input multi-output (Multi User Multi-input Multi- In output, MU-MIMO for short, it is necessary to use more accurate channel information.
  • the feedback of channel information is mainly the feedback method using a simple single codebook, and the MIMO transmission.
  • the performance of precoding techniques is more dependent on the accuracy of the codebook feedback.
  • the transmitting end and the receiving end jointly save or real-time generate the codebook 9t (the transmitting end and the receiving end are the same).
  • the receiving end selects a codeword that best matches the channel H from the codebook space 9t according to a certain criterion, and numbers the codeword (codeword) Serial number) Feedback back to the transmitter.
  • the codeword sequence number is referred to as a Precoding Matrix Indicator (PMI) in the codebook.
  • PMI Precoding Matrix Indicator
  • the transmitting end finds the corresponding precoding codeword according to the serial number, and also obtains corresponding channel information, indicating the characteristic vector of the channel. Quantity information.
  • the codebook space 9t can be further divided into codebooks corresponding to a plurality of ranks, and each Rank corresponds to a plurality of codewords to quantize the precoding matrix formed by the channel feature vectors under the Rank. Since the number of Rank and non-zero feature vectors of the channel are equal, in general, when the Rank is N, the code word will have N columns. Therefore, the codebook space 91 can be divided into a plurality of subcodebooks according to the difference of Rank, as shown in Table 1. Table 1. The codebook is divided into multiple subcodes according to Rank.
  • the code words that need to be stored in Rank>l are in the form of a matrix.
  • the codebook in the LTE protocol is a feedback method for such codebook quantization.
  • the LTE downlink 4 transmit antenna codebook is shown in Table 2.
  • the precoding codebook and the channel information quantization codebook in LTE have the same meaning.
  • the vector can also be viewed as a matrix of dimension 1.
  • Wl h ' h ' ⁇ denotes a matrix composed of the 2nd , ..., j n columns of the matrix W k , and represents a conjugate transposed matrix of u n ; and n represents a sequence number, and the value is 0-15.
  • the minimum feedback unit of channel information is a subband, and the channel information may correspond to one subband, multiple subbands, or all subbands.
  • a subband is composed of a plurality of resource blocks (RBs), and each RB is composed of a plurality of resource elements (RE elements).
  • RE is the smallest unit of time-frequency resources in LTE, and the LTE resource representation method is used in the LTE-Advanced (LTE-A) system.
  • the channel state information feedback includes: a channel quality indication (CQI), a rank indicator (RI), and a precoding matrix indicator (PMI).
  • CQI is an indicator to measure the quality of downlink channels.
  • CQI is represented by an integer value of 0 to 15, which respectively represent different CQI levels, and different CQIs correspond to respective modulation modes and coding rates (MCS).
  • the RI is used to describe the number of spatially independent channels, corresponding to the rank of the channel response matrix.
  • the UE In open space In the multiplexing and closed-loop spatial multiplexing mode, the UE needs to feed back RI information, and other modes do not need to feed back RI information.
  • the rank of the channel matrix corresponds to the number of layers.
  • the PMI information is used to describe the feature vector information of the channel.
  • the reporting of the UE to the base station enables the base station to perform better precoding.
  • PMI uses the form of codebook feedback.
  • codebook feedback With the development of communication technology, there is a higher demand for spectrum efficiency in the LTE-A system, so the number of antennas has also increased to eight. For this, it is necessary to design 8 transmit antenna codebook feedback for quantitative feedback of channel information.
  • 8 antennas one application form uses dual-polarized antennas (other applications also have other transmit antenna configurations), so it is necessary to design a codebook suitable for dual-polarized channels and a codebook suitable for single-polarized channels.
  • One idea in the prior art is: changing the traditional construction of an 8 antenna codebook for subbands
  • the feedback of the PMI channel information is replaced by the UE feeding back a long-term channel information PMI1.
  • the base station finds the corresponding codeword WPMI1 from a codebook C1, and the UE also feeds back a PMI2, and the base station finds the corresponding code from another codebook C2.
  • PMI1 can be configured as long-term feedback or wide-band (Wideband) shared feedback, characterizing broadband and/or less accurate channel information that does not change over time, and PMI2 is configured for short-term or single sub-band feedback. Enhance channel information accuracy, which can effectively save overhead in the case of low Rank with strong channel correlation.
  • An existing C1 design is: using 16 8-dimensional Discrete Fourier Transform (DFT) vector codewords, the model of the DFT vector codeword can be expressed as:
  • the present invention provides a channel information acquiring method, the method comprising: transmitting, by a terminal, a first precoding matrix indicator and a second precoding matrix indicator to a base station; the first precoding matrix indicator Is a precoding matrix indicator PMI1 corresponding to the entire bandwidth S subbands and corresponds to the codeword W1 in the first codebook, the second precoding matrix indicator being a precoding matrix indication corresponding to the entire bandwidth S subbands as a whole And PMI2 and corresponding to W2 in the second codebook, or the second precoding matrix indicator is X coding matrix indicators PMI respectively corresponding to the individual subbands and respectively corresponding to the codewords W in the second codebook, Where X is an integer greater than 0 and less than or equal to S,
  • the first codebook is as shown in the following table:
  • the first codebook simultaneously conforms to a feature vector model of a single-polarized channel and a dual-polarized channel.
  • the codebook obtained by performing the same row and row exchange on all the codewords in the first codebook is used as the first codebook.
  • the second codebook is an enhanced spreading codebook suitable for a dual-polarized channel or a single-polarized channel.
  • the value of the function F (A, B) is multiplied by the value of the first parameter matrix A by the first parameter matrix A.
  • the present invention further provides a channel information acquiring system, where the system includes a terminal and a base station, where the terminal is configured to: send a first precoding matrix indicator and a second precoding matrix to the base station.
  • the first precoding matrix indicator is a pre-compilation corresponding to the whole bandwidth S subbands as a whole a code matrix indicator PMI1 and corresponding to the codeword W1 in the first codebook, the second precoding matrix indicator being a precoding matrix indicator PMI2 corresponding to the entire full bandwidth S subbands and corresponding to the second codebook W2, or a second precoding matrix indicator is X code matrix indicators PMI respectively corresponding to individual subbands and respectively corresponding to codewords W in the second codebook, where X is greater than 0 and less than or equal to S An integer, where i is an integer greater than 0 and less than or equal to X; the base station is configured to: obtain, according to the first codebook, after receiving the first precoding matrix indicator and the second precoding matrix indicator a codeword W1 corresponding to the first precoding matrix indicator, obtaining a codeword W2 or W corresponding to the second precoding matrix indicator according to the second codebook, and calculating according to a preset function F (W1, W1, W
  • the first codebook is as shown in the following table:
  • the present invention further provides a base station, where the base station includes: a receiving module, configured to: receive a first precoding matrix indicator and a second precoding matrix indicator sent by the terminal to the base station, and Transmitting the received first precoding matrix indicator and the second precoding matrix indicator to a channel information acquiring module, where the first precoding matrix indicator is a precoding corresponding to a whole bandwidth S subbands as a whole a matrix indicator PMI1 and corresponding to the codeword W1 in the first codebook, the second precoding matrix indicator being a precoding matrix indicator PMI2 corresponding to the entire bandwidth S subbands and corresponding to the W2 in the second codebook Or the second precoding matrix indicator is X code matrix indicators PM respectively corresponding to individual subbands and respectively corresponding to code
  • the first codebook is as follows:
  • the technical solution of the present invention uses a multi-codebook joint feedback method suitable for both a dual-polarized channel and a single-polarized channel, and uses a first codebook suitable for both a single-polarized channel and a dual-polarized channel, and is effective.
  • FIG. 1 is a schematic diagram showing performance comparison of a beam formed by a corresponding 16 codewords under a single-polarized antenna and an ideal 16 DFT codewords.
  • FIG. 2 is a schematic diagram of a method for acquiring channel information in an embodiment of the present invention.
  • the channel information obtaining method in this embodiment includes: the terminal transmitting a first precoding matrix indicator and a second precoding matrix indicator to the base station; the first precoding matrix indicator is corresponding to the full bandwidth.
  • the second precoding matrix indicator being a precoding matrix indicator PMI2 corresponding to the entire bandwidth S subbands as a whole and corresponding to The W2 in the second codebook, or the second precoding matrix indicator is X coding matrix indicators PMI respectively corresponding to the individual subbands and respectively corresponding to the codewords W in the second codebook, where X is greater than 0 And an integer less than or equal to S, i is an integer greater than 0 and less than or equal to X; and after the base station receives the first precoding matrix indicator and the second precoding matrix indicator, according to the first codebook Obtaining a codeword W1 corresponding to the first precoding matrix indicator, and obtaining a codeword W2 or W corresponding to the second precoding matrix indicator according to the second codebook, according to a preset function F (Wl, W2) Calculating the channel information of the entire S subbands or calculating the channel information
  • the first codebook can also be set as shown in Table 4.
  • K is a non-zero real or complex number.
  • the 16 codewords in the first codebook have not only the performance of approaching 16 DFT codewords under the single-polarized antenna, but also the feature vector space of the channel information that needs to be quantized, as shown in FIG. The coverage is very close, conforming to the eigenvector model of a single-polarized channel.
  • the method of the present invention satisfies the 8PSK characteristic and can effectively reduce the complexity. So-called
  • the 8PSK feature means that all codewords in the codebook are composed of the following 8PSK alphabetic elements, and the 8PSK alphabetic set can be designed to reduce the codebook.
  • the complexity of code word search The codebook obtained by performing the same row and row exchange on all the codewords in the first codebook is used as the first codebook.
  • the row exchange of all the codewords in the first codebook for the same rule is an equivalent transformation of the present invention, since the exchange of the row codewords only requires the exchange of the corresponding antenna numbers, and the effect of the present invention can be achieved.
  • the second codebook is an enhanced spreading codebook suitable for a dual-polarized channel or a single-polarized channel.
  • the functions of the terminal and the base station in the channel information acquiring system in this embodiment are the same as those in the foregoing method, and the description is not repeated here.
  • Application Example 1 For S subbands, the UE feeds back one PMI1 for S subbands and at least one PMI2 for a certain subband, and may be at most S PMI2s for S subbands.
  • This application example uses feedback as one PMI2 as an example.
  • the UE determines that the index of the PMI1 indication to be fed back is 3 according to the first codebook shown in Table 3, and feeds back a PMI2 according to the second codebook.
  • the second codebook is a combined codebook of a 3-bit single-polarized DFT enhancement codebook and a dual-polarization phase rotation enhancement codebook, and the eight codewords included are: Table 5
  • the base station finds the corresponding codeword W1 from the first codebook according to the received PMI1 as [1 -j -1 j 1 -j -1 j] T , and finds the corresponding code from the second codebook according to the received PMI2.
  • the word W2 is:
  • Application Example 2 For S subbands, UE1 feeds back one PMI1 for S subbands, and at least one PMI2 for a certain subband, up to S PMI2s for S subbands.
  • This application example uses the feedback of P PMI2 as an example.
  • the UE determines that the index of the PMI1 to be fed back is 4 according to the first codebook shown in Table 4, and feeds the S PMIs according to the second codebook shown in Table 5, that is, ⁇ 2-1, ⁇ 2-2, Across . , PMI2-S.
  • the base station finds the corresponding codeword W1 from the first codebook according to the received PMI1 as ⁇ , ⁇ hi , according to the received S ⁇ 2 from the second code
  • Application Example 3 For S subbands, the UE feeds back one PMI1 for S subbands and one PMI2 for S subbands, PMI1 corresponds to the codeword W1 in the first code, and PMI2 corresponds to the codeword W2 in the second code.
  • the setting of the second codebook may be in addition to the above-described Table 5, and other forms of setting of a codebook suitable for both a dual-polarized channel and a single-polarized channel may be employed.
  • the embodiment further provides a channel information acquiring system, the system comprising a terminal and a base station, Medium,
  • the terminal is configured to: send a first precoding matrix indicator and a second precoding matrix indicator to the base station;
  • the first precoding matrix indicator is a precoding matrix indicator PMI1 corresponding to the whole bandwidth s subbands as a whole And corresponding to the codeword W1 in the first codebook
  • the second precoding matrix indicator is a precoding matrix indicator PMI2 corresponding to the entire bandwidth S subbands and corresponds to W2 in the second codebook, or the second
  • the precoding matrix indicator is X code matrix indicators PMI respectively corresponding to individual subbands and respectively correspond to codewords W in the second codebook, where X is an integer greater than 0 and less than or equal to S, i is greater than An integer that is less than or equal to X;
  • the base station is configured to: obtain the first precoding according to the first codebook after receiving the first precoding matrix indicator and the second precoding matrix indicator a codeword W1 corresponding to the matrix indicator, obtaining a codeword W2 or W corresponding to the second precoding
  • the embodiment further provides a base station, where the base station includes: a receiving module, configured to: receive a first precoding matrix indicator and a second precoding matrix indicator sent by the terminal to the base station, and receive the received Transmitting the first precoding matrix indicator and the second precoding matrix indicator to the channel information acquiring module; wherein, the first precoding matrix indicator is a precoding matrix indicator PMI1 corresponding to the entire bandwidth S subbands as a whole and Corresponding to the codeword W1 in the first codebook, the second precoding matrix indicator is a precoding matrix indicator PMI2 corresponding to the entire bandwidth S subbands and corresponds to W2 in the second codebook, or the second pre The coding matrix indicator is X code matrix indicators PM respectively corresponding to individual subbands and respectively correspond to codewords W in the second codebook, where X is an integer greater than 0 and less than or equal to S, i is greater than 0 And an integer less than or equal to X; and a channel information acquiring module, configured to: obtain a codeword
  • the present invention uses a multi-codebook joint feedback method suitable for both a dual-polarized channel and a single-polarized channel, and uses a first codebook suitable for both a single-polarized channel and a dual-polarized channel, which is effective. Supports the implementation of 8 transmit antenna codebook feedback, improves system performance, and is compatible with various second codebook enhancement methods.

Landscapes

  • 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

La présente invention se rapporte à un procédé et à un système adaptés pour obtenir des informations de voie. Elle se rapporte également à une station de base. Le procédé selon l'invention comprend les étapes suivantes : un terminal transmet un premier indicateur de matrice de précodage (PMI) et un second PMI à une station de base ; ledit premier PMI est un PMI1 qui correspond à la totalité des S sous-bandes dans la bande passante totale et il correspond au mot codé W1 dans le premier livre de codes ; le second PMI est un PMI2 qui correspond à la totalité des S sous-bandes dans la bande passante totale et il correspond au mot codé W2 dans le second livre de codes ; ou bien, le second PMI est X PMI2i qui correspondent respectivement à une seule sous-bande et qui correspondent respectivement aux mots codés W2i dans le second livre de codes. D'autre part, la station de base obtient le mot codé W1 et le mot codé W2 ou W2i et détermine les informations de voie de la totalité des S sous-bandes dans la bande passante totale ou bien elle détermine les informations de voie de chaque sous-bande pertinente parmi les S sous-bandes.
PCT/CN2011/075779 2010-06-18 2011-06-15 Procédé et système adaptés pour obtenir des informations de voie, et station de base WO2011157217A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010211195.6 2010-06-18
CN201010211195.6A CN101860420B (zh) 2010-06-18 2010-06-18 一种信道信息获取方法及系统

Publications (1)

Publication Number Publication Date
WO2011157217A1 true WO2011157217A1 (fr) 2011-12-22

Family

ID=42946096

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2011/075779 WO2011157217A1 (fr) 2010-06-18 2011-06-15 Procédé et système adaptés pour obtenir des informations de voie, et station de base

Country Status (2)

Country Link
CN (1) CN101860420B (fr)
WO (1) WO2011157217A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101860420B (zh) * 2010-06-18 2015-08-12 中兴通讯股份有限公司 一种信道信息获取方法及系统
CN102468932B (zh) * 2010-11-16 2016-09-21 株式会社Ntt都科摩 多用户多输入多输出系统的信道质量估计方法和用户设备
CN103220026B (zh) * 2012-01-19 2016-06-29 中国移动通信集团公司 码本反馈方法及信号接收装置、信号发送方法及装置
US9281881B2 (en) * 2013-02-12 2016-03-08 Texas Instruments Incorporated 4TX codebook enhancement in LTE
WO2014169421A1 (fr) * 2013-04-15 2014-10-23 华为技术有限公司 Procédé permettant de rapporter des informations d'état de canal, dispositif d'utilisateur et station de base
CN107612599A (zh) * 2017-08-04 2018-01-19 深圳市金立通信设备有限公司 一种指示频率选择性预编码信息的方法、基站及用户设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009096708A1 (fr) * 2008-01-30 2009-08-06 Lg Electronics Inc. Procédé de transmission d'informations de précodage dans un système à plusieurs antennes
CN101631004A (zh) * 2009-08-10 2010-01-20 中兴通讯股份有限公司 一种预编码方法、系统及预编码码本的构造方法
CN101860420A (zh) * 2010-06-18 2010-10-13 中兴通讯股份有限公司 一种信道信息获取方法及系统
CN101969366A (zh) * 2010-09-26 2011-02-09 华中科技大学 用于8发射天线mimo系统的预编码方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009096708A1 (fr) * 2008-01-30 2009-08-06 Lg Electronics Inc. Procédé de transmission d'informations de précodage dans un système à plusieurs antennes
CN101631004A (zh) * 2009-08-10 2010-01-20 中兴通讯股份有限公司 一种预编码方法、系统及预编码码本的构造方法
CN101860420A (zh) * 2010-06-18 2010-10-13 中兴通讯股份有限公司 一种信道信息获取方法及系统
CN101969366A (zh) * 2010-09-26 2011-02-09 华中科技大学 用于8发射天线mimo系统的预编码方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ALCATEL-LUCENT SHANGHAI BELL ET AL.: "Development of two-stage feedback framework for Rel-10.", 3GPP TSG RAN WG1 #60BIS MEETING R1-101859, 12 April 2010 (2010-04-12) - 16 April 2010 (2010-04-16), pages 3 - 4 *

Also Published As

Publication number Publication date
CN101860420B (zh) 2015-08-12
CN101860420A (zh) 2010-10-13

Similar Documents

Publication Publication Date Title
US11671154B2 (en) Methods and devices for determining precoder parameters in a wireless communication network
JP2024081761A (ja) ４ＴｘＭＩＭＯのためのＰＵＣＣＨでのＣＳＩフィードバックのためのコードブックサブサンプリング
EP2577923B1 (fr) Appareil, procédé et produit programme d'ordinateur pour sélectionner un groupe de faisceaux et un sous-ensemble de faisceaux dans un système de communication
CN107872261B (zh) 一种报告信道状态信息的方法、用户设备和基站
RU2508598C2 (ru) Способ и устройство сбора информации о состоянии канала
CN107689823B (zh) 信道状态信息反馈的方法以及一种用户设备和基站
CN101826951B (zh) 反馈信道状态信息的方法及装置
CN101958773B (zh) 反馈信道信息的方法及终端
WO2012041107A1 (fr) Procédé et terminal pour retour d'information d'état de canal
WO2011160557A1 (fr) Procédé et système d'acquisition d'informations de canal
WO2011160451A1 (fr) Procédé et terminal de renvoi d'informations d'état de canal
WO2011124021A1 (fr) Procédé et appareil de retour d'informations et de pré-codage
WO2011134322A1 (fr) Procédé et terminal permettant de renvoyer des informations d'état de canal
WO2016015225A1 (fr) Procédé et dispositif de réception et de renvoi d'informations d'état de canal
WO2011157217A1 (fr) Procédé et système adaptés pour obtenir des informations de voie, et station de base
WO2011097896A1 (fr) Procédé et système de renvoi d'informations de canal mimo
WO2018024157A1 (fr) Procédé de transmission d'informations d'état de canal, procédé de réception, et dispositif et système
WO2011160453A1 (fr) Procédé de rétroaction pour informations d'état de canal
WO2012028023A1 (fr) Procédé et terminal pour renvoi d'informations d'état de canal
WO2011134229A1 (fr) Procédé et dispositif d'obtention d'informations de canal

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 11795183

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 11795183

Country of ref document: EP

Kind code of ref document: A1