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WO2017003208A1 - Procédé d'émission pmi, procédé de réception pmi et dispositifs associés - Google Patents

Procédé d'émission pmi, procédé de réception pmi et dispositifs associés Download PDF

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Publication number
WO2017003208A1
WO2017003208A1 PCT/KR2016/007020 KR2016007020W WO2017003208A1 WO 2017003208 A1 WO2017003208 A1 WO 2017003208A1 KR 2016007020 W KR2016007020 W KR 2016007020W WO 2017003208 A1 WO2017003208 A1 WO 2017003208A1
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WO
WIPO (PCT)
Prior art keywords
csr
signaling
csr signaling
pmi
available
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2016/007020
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English (en)
Inventor
Ranran Zhang
Jingxing Fu
Ang YANG
Xin GUI
Meifang Jing
Jianfei CAO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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 Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of WO2017003208A1 publication Critical patent/WO2017003208A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO 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
    • H04B7/0413—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
    • H04B7/0481—Special codebook structures directed to feedback optimisation using subset selection of codebooks

Definitions

  • the present disclosure relates to wireless communication technologies, and more particularly, to a precoding matrix indicator (PMI) transmitting method, a PMI receiving method and devices thereof.
  • PMI precoding matrix indicator
  • a wireless fading channel possesses time-varying characteristics. It is necessary to obtain channel information, so as to effectively transmit signals, implement user scheduling, space precoding, modulation and coding scheme (MCS) selection, and so on.
  • MCS modulation and coding scheme
  • an evolved Node B (eNB) transmits control signaling, so as to indicate a user equipment (UE) to feed back corresponding channel state information (CSI).
  • UE user equipment
  • CSI channel state information
  • the eNB controls time and frequency resources, which are adopted by the UE to report the CSI.
  • the CSI includes a rank indication (RI), a channel quality indicator (CQI), a precoding matrix indicator (PMI) and a precoding type indicator (PTI).
  • the RI is to indicate a valid data layer number of a physical downlink shared channel (PDSCH).
  • PDSCH physical downlink shared channel
  • the CQI represents current channel quality, which corresponds to a channel signal-to-noise ratio (SNR) value.
  • SNR channel signal-to-noise ratio
  • the PMI is to indicate an index of a precoding matrix in a codebook.
  • the PTI is to indicate a precoding feedback type.
  • the PMI is to recommend a precoding matrix to an eNB.
  • the recommended precoding matrix comes from a codebook.
  • the codebook consists of some predefined precoding matrixes. Each precoding matrix corresponds to one index, or a group of indexes.
  • the eNB may search out a unique precoding matrix from a predefined codebook through PMI feedback.
  • a UE may estimate a downlink channel from an eNB to the UE, by measuring downlink channels. Subsequently, the UE may determine RI and PMI matching the downlink channel, based on the downlink channel. However, the UE cannot estimate other downlink channels from the eNB to other UEs. Thus, a higher strength of received signal may be obtained by the downlink transmission, which is from the eNB to the UE, by using the RI and PMI recommended by the UE. However, at this time, a greater interference may be generated for users in the same cell or in an adjacent cell. Thus, from the standpoint of system, the RI and PMI recommended by the UE may be not appropriate.
  • the CSR includes multiple bits. Each bit corresponds to a precoding matrix, or a group of precoding matrixes in a codebook. A precoding matrix, or a group of precoding matrixes in a codebook may be disabled, by setting a bit in the CSR to 0. Subsequently, a UE is only allowed to report a PMI, which corresponds to a precoding matrix permitted by the CSR. Table 1 lists a corresponding relationship between a transmission mode and a bit number, which is needed by the CSR in an available transmission mode.
  • Table 1 bit number needed by CSR in an available transmission mode
  • the eNB issues the CSR with radio resource control (RRC) signaling.
  • RRC radio resource control
  • the CSR allows the PMI feedback to use one subset of a precoding matrix set in a codebook.
  • the PMI still uses a corresponding relationship, which is between a precoding matrix in a precoding matrix set of a codebook and a precoding matrix index.
  • the CSR value does not have an impact on the bit number needed by the PMI feedback.
  • a physical antenna element is not only distributed in the horizontal dimension, but also distributed in the vertical dimension and horizontal dimension, so as to form a 2-dimensional (2-D) antenna array.
  • N represents antenna number of horizontal single polarization direction
  • M represents antenna number in the vertical dimension.
  • FIG.1 illustrates a cross-polarized 2-D antenna array.
  • FIG.2 illustrates a single polarized 2-D antenna array.
  • a higher order multi-user (MU) transmission with vertical dimensional beam forming becomes possible, accompanying with the occurrence of 2-D antenna array.
  • the MU transmission refers to transmitting a signal to multiple UEs simultaneously, by using the same time frequency resources.
  • the higher order MU transmission with vertical dimensional beam forming may result in frequent interference changes within a system.
  • the 2-D antenna array may lead to a large-amplitude increasing to the eNB antenna number. Subsequently, codebook size (number of included precoding matrixes) will also be increased significantly. The overhead in the CSR will also be greatly increased.
  • FD-MIMO Full Dimension MIMO
  • antenna number of FD-MIMO system is increased significantly.
  • codebook size of the FD-MIMO system is increased greatly, and the order of MU transmission in the FD-MIMO system is also increased.
  • an original mechanism for issuing CSR with RRC signaling may be faced with some new problems.
  • Gain of omnidirectional MIMO mainly comes from MU-MIMO. Compared with a single-user MIMO system, to better eliminate interferences among users, the MU-MIMO system needs a PMI with higher accuracy.
  • the PMI overhead may be reduced by codebook sub-sampling. Meanwhile, accuracy of PMI may be reduced, which may greatly reduce performances of MU-MIMO. Subsequently, gain of omnidirectional MIMO system may also be reduced. Thus, current codebook sub-sampling is not applicable to the omnidirectional MIMO system.
  • the present disclosure provides a PMI transmitting method, a PMI receiving method, and corresponding devices. Subsequently, the PMI feedback problem in a MU MIMO system may be solved.
  • the present disclosure provides a PMI receiving method, including:
  • first CSR signaling indicates an available PMI set of all the PMIs
  • the CSI includes a PMI obtained by the UE, after referring to the first CSR signaling and the second CSR signaling.
  • a second frequency transmitting the second CSR signaling is greater than, or equal to a first frequency transmitting the first CSR signaling.
  • the method further includes:
  • the second CSR signaling indicates the available PMI set for the UE, on the basis of the first CSR signaling, includes:
  • the second CSR signaling is applied to subframe, after a subframe receiving the second CSR signaling, the first CSR signaling is applied to subframe , after a subframe receiving a reception acknowledge signal of the first CSR signaling from the UE, N1 and N2 are predefined.
  • the reception acknowledge signal of the first CSR signaling includes:
  • the present disclosure also provides a PMI receiving device, including a transmitting module and a receiving module, wherein
  • the transmitting module is to transmit first CSR signaling and second CSR signaling, wherein the first CSR signaling indicates an available PMI set of all the PMIs, the second CSR signaling indicates an available PMI set of a UE, on the basis of the first CSR signaling; and
  • the receiving module is to receive CSI reported by the UE, wherein the CSI includes a PMI obtained by the UE, after referring to the first CSR signaling and the second CSR signaling.
  • the present disclosure also provides a PMI transmitting method, including:
  • a second frequency transmitting the second CSR signaling is greater than, or equal to a first frequency transmitting the first CSR signaling.
  • the method further includes:
  • obtaining the complete CSR based on the first CSR signaling and the second CSR signaling includes:
  • the method further includes:
  • N1 and N2 are predefined.
  • the reception acknowledge signal of the first CSR signaling is a given value of a given bit, or a resource index of an initial transmission of the first CSR signaling.
  • the present disclosure also provides a PMI transmitting device, including a receiving module and a measurement reporting module, wherein
  • the receiving module is to receive first CSR signaling and second CSR signaling, wherein the first CSR signaling indicates an available PMI set of all the PMIs, the second CSR signaling indicates an available PMI set of a UE, on the basis of the first CSR signaling; and,
  • the measurement reporting module is to report CSI with a PMI, wherein the PMI is obtained by the UE after referring to the first CSR signaling and the second CSR signaling.
  • the eNB may divide the CSR into first CSR signaling and second CSR signaling to be issued. After receiving the first CSR signaling and the second CSR signaling, the UE determines an available PMI set, based on the first CSR signaling and the second CSR signaling. And then, the UE determines a PMI in the available PMI set, and feeds back the determined PMI to the eNB.
  • Respectively employ a different transmission frequency e.g., respectively employ semi-static signaling and dynamic signaling
  • a different transmission frequency e.g., respectively employ semi-static signaling and dynamic signaling
  • the CSR may meet higher time-varying interference requirements in the future MIMO system.
  • the PMI feedback is encoded within the available PMI set of the UE, instead of being encoded within an original codebook set, so as to reduce the PMI feedback overhead. Meanwhile, PMI accuracy loss resulted from codebook sub-sampling may be avoided.
  • a user terminal combines the first CSR signaling and the second CSR signaling, so as to implement dynamical CSR. Subsequently, high reconstruction delay resulted from CSR semi-static characteristics may be reduced.
  • the eNB learns whether the UE selecting the PMI obtains the CSR signaling. Subsequently, ambiguity problem of RRC signaling may be solved.
  • FIG.1 is a schematic diagram illustrating a cross-polarized 2-D antenna array.
  • FIG.2 is a schematic diagram illustrating a unipolar 2-D antenna array.
  • FIG.3 is a flowchart illustrating a PMI receiving method, in accordance with an example of the present disclosure.
  • FIG.4 is a flowchart illustrating a PMI transmitting method, in accordance with an example of the present disclosure.
  • FIG.5 is a schematic diagram illustrating structure of a PMI receiving device, in accordance with an example of the present disclosure.
  • FIG.6 is a schematic diagram illustrating structure of a PMI transmitting device, in accordance with an example of the present disclosure.
  • the present disclosure provides a PMI receiving method, which may be applied to an eNB side.
  • first CSR signaling indicates an available PMI set of all the PMIs.
  • second CSR signaling indicates an available PMI set of a UE.
  • receive CSI reported by the UE which may include as follows.
  • the PMI is obtained.
  • the PMI is selected by the UE from the available PMI set of the UE, which is indicated by the second CSR signaling on the basis of the first CSR signaling.
  • a second frequency for transmitting the second CSR signaling may be greater than, or equal to a first frequency transmitting the first CSR signaling.
  • the method may further include as follows. Receive a reception acknowledge signal of the first CSR signaling from the UE.
  • the present disclosure also provides a PMI transmitting method, which is applied to UE side. Firstly, receive the first CSR signaling and the second CSR signaling.
  • the first CSR signaling indicates an available PMI set of all the PMIs.
  • the second CSR signaling indicates an available PMI set for a UE.
  • obtain a complete CSR by using the first CSR signaling and the second CSR signaling.
  • obtain the PMI After referring to the complete CSR, obtain the PMI. Finally, report the PMI carried by the CSI.
  • the UE After obtaining the complete CSR, by referring to the first CSR signaling and the second CSR signaling, the UE selects a PMI from the available PMI set, which is indicated by the complete CSR.
  • Current PMI feedback is encoded within an original codebook set. For example, when codebook size is 16, 4 bits are needed to transmit the PMI. However, in the present disclosure, after referring to the first CSR signaling and the second CSR signaling by the UE, the obtained available PMI set of the UE is smaller than the original codebook set. Correspondingly, less bits are used to feed back the PMI.
  • FIG.3 is a flowchart illustrating a PMI receiving method, in accordance with an example of the present disclosure, which is applied to eNB side. With reference to FIG.3, the method may include the following blocks.
  • a CSR into a first CSR set and a second CSR set, which respectively form first CSR signaling and second CSR signaling.
  • the first CSR signaling indicates an available PMI set of all the PMIs.
  • the second CSR signaling indicates an available PMI set of a UE.
  • the second CSR signaling cannot change RI limitations.
  • a second frequency for transmitting the second CSR signaling is greater than, or equal to a first frequency transmitting the first CSR signaling. That is, the first CSR signaling is to indicate a preliminary available PMI set.
  • the second CSR signaling indicates the finally available PMI set.
  • the first CSR signaling and the second CSR signaling may respectively execute a corresponding indication, by using bitmap bit method. Specifically, there are several methods for the second CSR signaling to indicate an available PMI set, on the basis of the first CSR signaling.
  • bitmap bit of the second CSR signaling directly indicates an available PMI set, which is in the first CSR signaling.
  • the bitmap bit of the second CSR signaling indicates a first available PMI, which is in the first CSR signaling.
  • the first available PMI and subsequent (N-1) PMIs are available PMIs.
  • the total number N of available PMI is predefined.
  • the bitmap bit of the second CSR signaling indicates a bit offset in a PMI set, which is allowed by the first CSR signaling. For example, suppose bitmap bits of the second CSR signaling is N, after shifting N bits to the right, the PMI allowed by the first CSR signaling becomes the final available PMI set.
  • the RRC signaling includes the first CSR signaling, CQI report configuration, CSI-reference signal (RS) configuration, and so on.
  • the DCI includes the second CSR signaling.
  • the first CSR signaling is transmitted by RRC signaling under a semi-static mode.
  • the second CSR signaling is transmitted by DCI under a dynamic mode.
  • the second CSR signaling may be changed rapidly, based on CSI change.
  • the CSI includes PMI.
  • the PMI is obtained by the UE, after referring to the first CSR signaling and the second CSR signaling.
  • a periodic CSI report firstly transmit a periodic feedback trigger signal with DCI in PDCCH, and then receive a periodic CSI report with physical uplink shared channel (PUSCH) detection.
  • PUSCH physical uplink shared channel
  • an aperiodic CSI report receive an aperiodic CSI report with physical uplink control channel (PUCCH) or PUSCH detection.
  • PUCCH physical uplink control channel
  • N1 is predefined.
  • the first CSR signaling is applied to subframe, after a subframe receiving the reception acknowledge signal of the first CSR signaling from the UE.
  • N2 is predefined. There are several formats for the reception acknowledge signal of the first CSR signaling.
  • the UE reports one bit, which may be taken as the reception acknowledge signal of the first CSR signaling, so as to inform the change of CSR. For example, when the bit is 1, it represents that the first CSR signaling has been received successfully.
  • the UE may report number of first resource with the first CSR signaling, which may be taken as the reception acknowledge signal of the first CSR signaling. For example, when the first CSR signaling is transmitted with RRC signaling, take number of the first subframe carrying the first CSR signaling as the reception acknowledge signal of the first CSR signaling.
  • FIG.4 is a flowchart illustrating a PMI transmitting method, in accordance with an example of the present disclosure, which is applied to UE side. With reference to FIG.4, the method includes the following blocks.
  • the RRC signaling includes the first CSR signaling, CQI report configurations, CSI-RS configuration, and so on.
  • the CSI includes PMI, which is obtained after referring to the CSR.
  • PMI which is obtained after referring to the CSR.
  • a periodic CSI report firstly receive DCI in PDCCH, obtain a periodic feedback trigger signal, and then transmit a periodic CSI report signal in PUSCH, alternatively,
  • aperiodic CSI report transmits an aperiodic CSI report in PUCCH or PUSCH.
  • FIG.5 is a schematic diagram illustrating structure of the PMI receiving device, which includes a transmitting module and a receiving module.
  • the transmitting module is to transmit first CSR signaling and second CSR signaling.
  • the first CSR signaling indicates an available PMI set of all the PMIs.
  • the second CSR signaling indicates an available PMI set for a UE, on the basis of the first CSR signaling.
  • the receiving module is to receive CSI reported by the UE.
  • the CSI includes a PMI obtained by the UE, after referring to the first CSR signaling and the second CSR signaling.
  • the PMI receiving device in FIG.5 may further include a scheduling module and a precoding module.
  • the scheduling module is to perform scheduling, and to calculate a precoding vector based on PMI reported by the UE.
  • the precoding module is to transmit a DL grant in PDCCH/E-PDCCH, and transmit precoded data in PDSCH.
  • FIG.6 is a schematic diagram illustrating structure of the PMI transmitting device, which includes a receiving module and a measurement reporting module.
  • the receiving module is to receive first CSR signaling and second CSR signaling.
  • the first CSR signaling indicates an available PMI set of all the PMIs.
  • the second CSR signaling indicates an available PMI set of a UE, on the basis of the first CSR signaling.
  • the measurement reporting module is to report CSI carrying PMI.
  • the PMI is obtained by the UE, after referring to the first CSR signaling and the second CSR signaling.

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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)

Abstract

La présente invention concerne un procédé de réception par indicateur de matrice de précodage (PMI) qui peut comprendre les étapes suivantes. Émission d'une première signalisation de restriction d'un sous-ensemble de livres de codes (CSR), la première signalisation CSR indiquant un ensemble de PMI disponible parmi tous les PMI. Émission d'une seconde signalisation CSR, la seconde signalisation CSR indiquant un ensemble de PMI disponibles pour un équipement utilisateur (UE), sur la base de la première signalisation CSR. Réception d'informations d'état de canal (CSI) notifiées par l'UE. Les CSI portent un PMI obtenu par l'UE, après s'être référé à la première signalisation CSR et à la deuxième signalisation CSR. L'invention concerne également un procédé d'émission PIM, un dispositif de réception PMI et un dispositif d'émission PMI. L'utilisation des solutions techniques de la présente invention permet de résoudre le problème de la rétroaction dans un système multi-utilisateur (MU) à entrées multiples et sorties multiples (MIMO).
PCT/KR2016/007020 2015-06-30 2016-06-30 Procédé d'émission pmi, procédé de réception pmi et dispositifs associés Ceased WO2017003208A1 (fr)

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CN201510373062.1 2015-06-30
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US11082108B2 (en) 2017-01-25 2021-08-03 Huawei Technologies Co., Ltd. Channel state information transmission method, access network device, and terminal device

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CN108111206B (zh) 2017-05-11 2022-10-14 中兴通讯股份有限公司 码本配置方法、端口配置方法及装置
MX2020001686A (es) * 2017-08-18 2020-03-20 Guangdong Oppo Mobile Telecommunications Corp Ltd Procedimiento de notificacion de informacion de estado de canal y equipo relacionado.
US10547368B2 (en) * 2017-08-30 2020-01-28 Samsung Electronics Co., Ltd. Method and apparatus for codebook subset restriction for CSI reporting in advanced wireless communication systems
WO2019047241A1 (fr) * 2017-09-11 2019-03-14 Qualcomm Incorporated Conception de restriction de sous-ensemble de livre de codes pour mimo
CN110036570B (zh) * 2017-09-12 2021-07-16 联发科技股份有限公司 基于码本的上行链路传输方法及用户设备
WO2019052486A1 (fr) * 2017-09-12 2019-03-21 Mediatek Inc. Transmission de liaison montante basée sur un livre de codes dans des communications sans fil
CN110830151B (zh) * 2018-08-07 2021-06-15 华为技术有限公司 反馈信息的传输方法和装置
CN120785379A (zh) * 2024-04-03 2025-10-14 中兴通讯股份有限公司 码字集合的配置方法、装置、存储介质及计算机程序产品
CN120934572A (zh) * 2024-05-10 2025-11-11 中兴通讯股份有限公司 码字集合的配置方法、装置、存储介质及计算机程序产品

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