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WO2016076679A1 - Procédé et appareil de transmission d'informations d'état de canal - Google Patents

Procédé et appareil de transmission d'informations d'état de canal Download PDF

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Publication number
WO2016076679A1
WO2016076679A1 PCT/KR2015/012304 KR2015012304W WO2016076679A1 WO 2016076679 A1 WO2016076679 A1 WO 2016076679A1 KR 2015012304 W KR2015012304 W KR 2015012304W WO 2016076679 A1 WO2016076679 A1 WO 2016076679A1
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Prior art keywords
pmi
subband
feedback
sets
offset
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Jingxing Fu
Yi Wang
Yingyang Li
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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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
    • H04B7/06—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
    • H04B7/0645—Variable feedback
    • H04B7/0647—Variable feedback rate
    • 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
    • H04B7/0617—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 for beam forming
    • 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
    • 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
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • 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
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode 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
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • 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

Definitions

  • the present disclosure relates to wireless communication techniques, and more particularly, to transmission of a channel state information in a multi-antenna wireless communication system.
  • the 5G or pre-5G communication system is also called a 'Beyond 4G Network' or a 'Post LTE System'.
  • the 5G communication system is considered to be implemented in higher frequency (mmWave) bands, e.g., 60GHz bands, so as to accomplish higher data rates.
  • mmWave e.g., 60GHz bands
  • MIMO massive multiple-input multiple-output
  • FD-MIMO full dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • RANs cloud radio access networks
  • D2D device-to-device
  • wireless backhaul moving network
  • CoMP coordinated multi-points
  • FQAM FSK and QAM modulation
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • a scheme is required to make the horizontal subband PMI and the vertical subband PMI match, and obtain the CQI using two PMIs of the matching subband.
  • an embodiment of the present disclosure provides a CSI reporting method and an apparatus thereof, so as to make the CQI reported by the UE consistent with the practical channel characteristic, and improve system performance .
  • the CSI reporting method provided by the present disclosure includes:
  • the CSI report configuration corresponding to the 2D antenna configuration comprises: a CSI reporting mode, number of CSI Reference Signal (RS) ports for the antenna in each dimension, CSI reporting periodicity and offset.
  • RS CSI Reference Signal
  • the CSI reporting method comprises: reporting two sets of Precoding Matrix Indicator (PMI) feedback and one set of Channel Quality Indicator (CQI) feedback, and the CQI feedback is based on a combination of the two sets of PMI feedback.
  • PMI Precoding Matrix Indicator
  • CQI Channel Quality Indicator
  • the reporting two sets of PMI feedback and one set of CQI feedback comprises: reporting two sets of wideband PMI feedback and one set of subband CQI feedback, and reporting one set of Rank Indicator (RI).
  • RI Rank Indicator
  • the reporting the CSI based on the CSI reporting method by the UE comprises:
  • P1 and P2 respectively denotes the two sets of PMI feedback
  • BP j consists of N j subbands consecutive in the frequency domain.
  • the reporting the two sets of PMI feedback and one CQI feedback comprises: reporting one wideband PMI feedback, one UE selected subband PMI feedback and one subband CQI feedback, and reporting one RI;
  • a periodicity and an offset of the RI feedback and a periodicity and an offset of the subband CQI feedback are determined based on a periodicity and an offset of one of the two sets of PMI feedback.
  • the reporting the CSI based on the CSI reporting method by the UE comprises:
  • P1 denotes the UE selected subband PMI feedback and P2 denotes the wideband PMI feedback;
  • BP j consists of N j subbands consecutive in the frequency domain.
  • the higher layer signaling respectively configures the two sets of PMI feedback to be one wideband PMI feedback and one UE selected subband PMI feedback;
  • the PMI feedback with respect to the horizontal antenna array is the UE selected subband PMI
  • the PMI feedback with respect to the vertical antenna array is the wideband PMI feedback
  • the PMI feedback with respect to the double codebooks is the UE selected subband PMI feedback
  • PMI feedback with respect to the single codebook is the wideband PMI feedback
  • the reporting the two sets of PMI feedback and the one set of CQI feedback comprises: reporting one UE selected subband PMI feedback, one BP PMI feedback and one subband CQI feedback, and reporting one RI;
  • the BP PMI feedback indicates a precoding matrix selected from a codebook set based on the channel situation of all subbands of the BP within the system bandwidth; the periodicity and offset of the RI feedback and the periodicity and offset of the subband CQI feedback are determined based on the periodicity and offset of one of the two sets of PMI feedback.
  • the higher layer signaling configures the two sets of PMI feedback to be one UE selected subband PMI feedback and one BP PMI feedback; or
  • the PMI feedback with respect to the horizontal antenna array is the UE selected subband PMI
  • the PMI feedback with respect to the vertical antenna array is the BP PMI feedback
  • the PMI feedback with respect to the double codebooks is the UE selected subband PMI feedback
  • PMI feedback with respect to the single codebook is the BP PMI feedback
  • one of the two sets of PMI feedback is the PMI feedback with respect to horizontal antenna array, the PMI feedback with respect to double codebook, or the UE selected subband PMI feedback.
  • the reporting two sets of PMI feedback and one CQI feedback comprises: reporting two sets of UE selected subband PMI feedback and one subband CQI feedback;
  • the UE selects a subband with a maximum CQI value based on the situation of the two sets of PMI, and takes the corresponding PMI as the two sets of UE selected subband PMI to be reported.
  • the periodicity and offset of the two sets of PMI feedback are different, the periodicity and offset of the PMI feedback on which the periodicity and offset of the RI feedback and the periodicity and the offset of the subband CQI are based are determined based on a higher layer signaling configuration or characteristic of the two sets of wideband PMI; or,
  • the CSI reporting method is adopted if both of the two sets of PMI feedback adopt double codebooks, or one of the two sets of PMI feedback adopts double codebooks, and the other adopts single codebook, or, if both of the two sets of PMI feedback adopt single codebook.
  • the CSI reporting method is adopted if both of the two sets of PMI feedback adopt the double codebooks, or if one of the two sets of PMI feedback adopts double codebooks, and the other one adopts single codebook.
  • the method for reporting CSI is adopted if the two sets of PMI feedback adopt double codebooks.
  • An apparatus for reporting channel state information comprising: a configuration information obtaining module, a reporting method determining module and a reporting module, wherein
  • the configuration information obtaining module is adapted to obtain a CSI report configuration corresponding to a 2D antenna configuration
  • the reporting method determining module is adapted to determine a CSI reporting method based on the CSI reporting configuration
  • the reporting module is adapted to report CSI based on the determined CSI reporting method.
  • the CSI feedback may be more accurate, which improves the PDSCH demodulation performance and thereby increases the throughput of the downlink services.
  • FIG. 1 is a schematic diagram illustrating an antenna distribution of a horizontal antenna sub-array.
  • FIG. 2 is a schematic diagram illustrating a sub-array distribution of a 2D antenna.
  • FIG. 3 is a schematic diagram illustrating a beam direction distribution generated by the sub-array of the 2D antenna.
  • FIG. 4 is a schematic diagram illustrating difference between preferred subband for the horizontal PMI and the preferred subband for the vertical PMI.
  • FIG. 5 is a flowchart illustrating a CSI reporting method according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram illustrating a structure of a CSI reporting apparatus according to an embodiment of the present disclosure.
  • a device and method proposed in the present disclosure may be applied to various communication systems such as, a long-term evolution (LTE) mobile communication system, a LTE-advanced (LTE-A) mobile communication system, high speed downlink packet access (HSDPA), a high speed uplink packet access (HSUPA) mobile communication system, 3rd generation project partnership 2 (3GPP2), a high rate packet data (HRPD) mobile communication system, a wideband code division multiple access (WCDMA) 3GPP2 mobile communication system, a CDMA 3GPP2 mobile communication system, an Institute of Electrical and Electronics Engineers (IEEE) and 802.16m communication system, an evolved packet system (EPS), and a mobile internet protocol (Mobil, IP) systems, etc.
  • LTE long-term evolution
  • LTE-A LTE-advanced
  • HSDPA high speed downlink packet access
  • HSUPA high speed uplink packet access
  • 3GPP2 3rd generation project partnership 2
  • HRPD high rate packet data
  • periodic channel state information report includes: a wideband CQI feedback type and a UE selected subband CQI feedback type, as shown in Table 1. It is configured by higher-layer signaling that which CSI feedback type is used.
  • the CSI consists of Channel Quality Indicator (CQI), Precoding Matrix Indicator (PMI), Precoding Type Indicator (PTI), and Rank Indicator (RI).
  • Table 1 illustrates periodic CQI and PMI feedback type.
  • the PMI consists of precoding matrix indicators of double codebooks, i.e., consists of two precoding matrixes indicated by i1(first PMI) denoting a wideband long time precoding matrix indicator and i2(second PMI) denoting a subband short time precoding matrix indicator.
  • the CQI reported in some subframes are derived according to the channel quality of a preferred subband within a part of bandwidth of the serving cell system bandwidth, wherein the part of bandwidth of the system bandwidth is referred to as Bandwidth Part (BP) which consists of one or more subbands.
  • BP Bandwidth Part
  • the CQI reported in other subframes are derived according to the channel quality of all subbands within the serving cell system bandwidth.
  • the system bandwidth includes Resources Blocks (RBs)
  • N subbands of size k wherein subbands are of size k RBs.
  • one of the subbands is of size RBs, wherein denotes a round down operation and denotes a round up operation.
  • BP j consists of N j subbands which are consecutive in the frequency domain, there are J BPs in the system bandwidth.
  • the number of BPs and the subband size with respect to different system bandwidth are shown in Table 2.
  • Table 2 illustrates subband size (k) and number of BPs (J) with respect to different system bandwidth.
  • one subband is selected out of N j subbands of BP j by the UE for performing the CQI and/or PMI feedback.
  • the reporting instances for wideband CQI/wideband PMI and subband CQI/subband PMI are subframes satisfying , wherein N PD denotes a CQI reporting periodicity and N OFFSET,CQI is an offset value in the time domain.
  • ⁇ Wideband CQI/wideband PMI report (or wideband CQI/wideband second PMI) has a periodicity of , and is reported in the subframes satisfying .
  • the PMI of the wideband part may be referred to as “wideband PMI”
  • the PMI of the subband part may be referred to as “subband PMI”.
  • the wideband first PMI report has a periodicity of , and is reported on the subframes satisfying: , Wherein H' is signaled by higher-layer signaling.
  • the RI reporting periodicity is , and RI, or both RI and PTI, is reported on the subframes satisfying , wherein M RI is a multiple that the wideband RI reporting periodicity compared with the CQI reporting periodicity, N OFFSET,RI is a relative time offset of the RI reporting.
  • M RI is a multiple that the wideband RI reporting periodicity compared with the CQI reporting periodicity, N OFFSET,RI is a relative time offset of the RI reporting.
  • the RI is referred to as periodic RI.
  • the UE report one periodic RI, wherein the RI is calculated according to channel situations of all subbands in the serving cell system bandwidth.
  • the UE report one periodic RI and PTI, wherein the RI is calculated according to channel situations of all subbands in the serving cell system bandwidth.
  • ⁇ A single wideband precoding matrix is selected from the codebook subset according to S subbands within the system bandwidth.
  • the wideband precoding matrix is selected assuming the use of the most recently reported periodic RI.
  • ⁇ A wideband CQI value is calculated assuming the use of the most recently reported periodic RI, the selected wideband precoding matrix according to all S subbands within the system bandwidth.
  • the UE selects a subband from the N j subbands in BP j , wherein the subband is selected assuming the use of the most recently reported periodic RI and the precoding matrix indicated by the wideband PMI.
  • ⁇ A subband CQI is calculated according to the selected subband.
  • the subband CQI is obtained assuming the use of the most recently reported periodic RI and the precoding matrix indicated by the wideband PMI.
  • ⁇ A first wideband precoding matrix is selected from codebook subset according to the situation of all S subbands within the system bandwidth.
  • the first wideband precoding matrix is calculated conditioned on the last reported periodic RI.
  • ⁇ A second wideband precoding matrix is selected from codebook subset according to the situation of all S subbands within the system bandwidth.
  • the second wideband precoding matrix is calculated conditioned on the last reported periodic RI and the first wideband precoding matrix.
  • ⁇ Wideband CQI is calculated according to the situation of all S subbands within the system bandwidth, wherein the wideband CQI is calculated assuming the use of the most recently reported periodic RI, the first wideband precoding matrix and the above calculated second wideband precoding matrix.
  • ⁇ A second wideband precoding matrix is selected from codebook subset according to the situation of all S subbands within the system bandwidth.
  • the second wideband precoding matrix is calculated conditioned on the most recently reported periodic RI and the first wideband precoding matrix.
  • ⁇ Wideband CQI is calculated according to the situation of all S subbands within the system bandwidth, wherein the wideband CQI is calculated assuming the use of the most recently reported periodic RI, the first wideband precoding matrix and the above calculated second wideband precoding matrix.
  • ⁇ A preferred subband is selected from N j subbands of BP j .
  • ⁇ A subband second precoding matrix is calculated assuming the use of the most recently reported RI and the first wideband precoding matrix.
  • the subband second precoding matrix is calculated according to the channel situation of the preferred subband selected from the N j subbands of BP j .
  • ⁇ Subband CQI is calculated based on the channel situation of the preferred subband selected from the N j subbands of BP j .
  • the subband CQI is calculated assuming the use of the most recently reported periodic RI, the first wideband precoding matrix and the above calculated subband second precoding matrix.
  • FIG. 1 is a schematic diagram illustrating an antenna distribution of a horizontal antenna sub-array.
  • the antenna array is horizontally distributed, the antenna ports are horizontally distributed and one dimension antenna array is adopted, i.e., horizontal antenna array.
  • FIG. 2 is a schematic diagram illustrating a sub-array distribution of a 2D antenna.
  • FIG. 3 is a schematic diagram illustrating a beam direction distribution generated by the sub-array of the 2D antenna.
  • a two dimensional antenna array is adopted, i.e., a horizontal antenna array and a vertical antenna array.
  • the interference between the terminals with different vertical angels and the interference between terminals with different horizontal angels may be further reduced, so as to increase throughput of the cell, as shown in FIG. 3.
  • the UE needs to reports two sets of PMI. Then a CQI is derived and reported assuming the use of the two sets of PMI. If the UE is configured with the CQI feedback type with double codebook precoding matrix, e.g., in Mode 2-1, if the most recently reported PTI is equal to 1, in the subframe where the subband second PMI is reported, a preferred subband is selected from N j subbands of BP j and the subband second PMI is reported.
  • the preferred subband selected from the N j subbands for the horizontal PMI and the preferred subband selected from the N j subbands for the vertical PMI may be different.
  • the CQI is derived based on the two PMIs. If the two PMIs are with respect to different subbands, a matching subband CQI cannot be obtained.
  • the preferred subband selected from the N j subbands is subband m
  • the preferred subband selected from the N j subbands is subband n.
  • FIG. 4 is a schematic diagram illustrating difference between preferred subband for the horizontal PMI and the preferred subband for the vertical PMI. Therefore, a method is required to make the horizontal subband PMI and the vertical subband PMI match, and obtain the CQI using the two PMIs of the matching subband.
  • the present disclosure makes reported CQI and practical channel characteristic consistent through ensuring the matching of a subband of the horizontal PMI and a subband of the vertical PMI, so as to improve system performance.
  • FIG. 5 is a flowchart illustrating a CSI reporting method according to an embodiment of the present disclosure.
  • the method includes the following.
  • the UE obtains CSI report configuration corresponding to two-dimensional antenna configuration.
  • the CSI report configuration corresponding to the 2D antenna configuration includes: a CSI reporting mode, number of CSI RS ports of the antenna in each dimension, periodicity and offset of the CSI report.
  • the UE determines a CSI reporting method based on the CSI report configuration.
  • the UE reports CSI based on the determined CSI reporting method.
  • the method for the UE to determine the feedback manner of each set of PMI includes the following.
  • the UE selected subband CQI feedback type configured for the UE is with respect to two sets of PMI feedback and one CQI feedback, wherein the CQI feedback is a combined CQI obtained based on the two sets of PMI.
  • one set of PMI is a horizontal component PMI and the other set of PMI is a vertical component PMI.
  • the complete CQI is calculated based on the vertical component PMI and the horizontal component PMI. Under this situation, there may be four kinds of feedback manners:
  • the above subband CQI is calculated assuming the use of the two sets of PMI.
  • the above four feedback manners are described respectively.
  • Feedback manner 1 two sets of wideband PMI feedback and one set of subband CQI feedback
  • the two sets of PMI are both wideband PMI feedback. That is to say, for each of the two sets of PMI feedback, the UE feeds back merely the wideband PMI at any instances for reporting PMI, i.e., select one precoding matrix from the codebook set based on the channel situation of all S subbands within the system bandwidth.
  • Each set of the wideband PMI feedback may be single codebook PMI feedback or double codebook PMI feedback.
  • the periodicity N pd and offset N offset of each set of wideband PMI feedback are configured independently by the higher layer signaling.
  • this set of PMI is referred to as P1; the periodicity and offset of the other set of PMI feedback are respectively N2 pd and N2 offset , this set of PMI is referred to as P2.
  • the periodicity and the offset of the RI feedback and the periodicity and the offset of the subband CQI feedback are determined based on the periodicity and the offset of one of the two sets of wideband PMI.
  • the periodicity and the offset of the RI feedback and the periodicity and the offset of the subband CQI feedback are determined based on PMI feedback P1.
  • the periodicity and the offset of the RI feedback and the periodicity and the offset of the subband CQI feedback are determined based on the periodicity N1 pd and offset N1 offset of the PMI feedback, i.e.,
  • the wideband CQI/wideband PMI or subband CQI is reported in subframes satisfying ;
  • RI is reported in subframes satisfying , N OFFSET,RI denotes the offset of the RI report in the time domain, M RI denotes a multiple of the RI reporting periodicity compared to the CQI reporting periodicity.
  • RI is obtained based on the most recently reported P2 and the channel situation of all subbands within the system bandwidth.
  • the wideband PMI P1 is calculated based on the most recently reported wideband PMI P2 and the most recently reported RI based on the channel situation of all subbands within the system bandwidth.
  • the wideband CQI is obtained based on the most recently reported RI, the most recently reported wideband PMI P1 and P2 based on the channel situation of all subbands within the system bandwidth.
  • the subband CQI is obtained based on the most recently reported RI and the most recently reported wideband PMI P1 and P2 and based on the channel situation of the preferred subband selected from N j subbands of BP j .
  • the periodicity N2 pd and the offset N2 offset of the other set of wideband PMI feedback are configured independently by higher layer signaling, i.e., the wideband PMI is reported in subframes satisfying .
  • This set of wideband PMI indicates a proper precoding matrix selected from a precoding codebook set configured for this set of PMI based on the channel situation of all subbands within the system bandwidth, e.g., a proper precoding matrix selected from the precoding codebook set of the vertical antenna direction.
  • an embodiment of the present disclosure provides following determination methods.
  • the periodicity and offset of which set of PMI feedback form the basis for the periodicity and offset of the RI and subband CQI feedback. This method is relatively flexible.
  • the periodicity and offset of which set of PMI feedback form the basis for the RI and the subband CQI feedback e.g., the periodicity and offset of the RI and CQI feedback may be determined based on the periodicity and the offset of the horizontal wideband PMI feedback.
  • the two sets of wideband PMI feedback may use the same periodicity N pd and offset N offset , wherein the periodicity N pd and the offset N offset are configured by higher layer signaling.
  • Feedback manner 2 one set of wideband PMI feedback, one set of UE selected subband PMI feedback, and one set of subband CQI feedback.
  • one set of PMI is configured in the wideband PMI mode, i.e., with respect to this set of PMI, the UE reports merely wideband PMI at any instances for reporting PMI.
  • a precoding matrix is selected from the codebook set based on the channel situation of all S subbands within the system bandwidth.
  • the wideband PMI feedback may be a single codebook PMI feedback or a double codebook PMI feedback.
  • the other set of PMI is configured in a UE selected subband feedback mode.
  • the UE reports wideband PMI, i.e., select a precoding matrix from the codebook set based on the channel situation of all S subbands within the system bandwidth; at other instances for reporting PMI the UE reports the UE selected subband PMI, i.e., the UE selects a precoding matrix from the codebook set based on the channel situation of a preferred subband in one BP of the system bandwidth.
  • the UE selected subband feedback may be single codebook PMI feedback or double codebook PMI feedback. At present, only the double codebook PMI feedback supports the UE selected subband PMI feedback. Future PMI feedback of the vertical antenna array may be single codebook PMI feedback but supports the UE selected subband PMI feedback.
  • the periodicity and offset of the wideband PMI feedback and the periodicity and offset of the UE selected subband PMI feedback are configured by higher layer signaling independently.
  • the periodicity and offset of one set of PMI feedback is N1 pd and N1 offset , this set of PMI is referred to as P1.
  • the periodicity and offset of the other PMI feedback are respectively N2 pd and N2 offset , this set of PMI is referred to as P2.
  • the PMI feedback for the vertical antenna array is wideband PMI feedback
  • the PMI feedback for the horizontal antenna array is UE selected subband PMI feedback.
  • the UE may have different moving speeds on the horizontal direction and the vertical direction, it is appropriate to configure the periodicity and offset of the wideband PMI and the periodicity and the offset of the UE selected subband PMI feedback independently.
  • the periodicity and offset of the wideband PMI and those of the UE selected subband PMI feedback may be the same and are configured by the higher layer signaling.
  • the PMI feedback of the horizontal antenna array may be the UE selected subband PMI feedback
  • the PMI feedback of the vertical antenna array may be the wideband PMI feedback. Since the PMI feedback of the vertical antenna array is mainly used for beamforming whereas the PMI feedback of the horizontal antenna array is used for spatial multiplexing and beamforming, the beamforming is not sensitive to frequency selectivity but the spatial multiplexing does, such configuration may have a better performance.
  • the double codebook PMI feedback is the UE selected subband PMI feedback
  • the single codebook PMI feedback is the wideband PMI feedback. Since the double codebook PMI feedback is used for only the subband PMI feedback at present, the single codebook PMI feedback is used for the wideband PMI feedback.
  • the wideband PMI feedback is denoted by P1 and the wideband PMI feedback is denoted by P2, wherein the periodicity and offset of P1 and those of P2 are configured by higher layer signaling independently.
  • the wideband PMI indicates a precoding matrix selected from the precoding codebook set configured for this set of PMI based on the channel situation of all subbands within the system bandwidth, e.g., a proper precoding matrix selected from the precoding codebook set of the vertical antenna direction.
  • the periodicity and offset of the RI feedback and those of the subband CQI feedback may be determined based on the periodicity and offset of the PMI feedback P1.
  • the periodicity and offset of the RI feedback and those of the subband CQI feedback are determined based on the periodicity N1 pd and offset N1 offset of the PMI feedback, i.e., wideband CQI/wideband PMI or subband CQI/subband PMI are reported in subframes satisfying ;
  • RI is reported in subframes satisfying , wherein N OFFSET,RI denotes the offset of the RI report in the time domain, M RI denotes a multiple of the RI reporting periodicity compared to the CQI reporting periodicity.
  • RI is obtained based on the most recently reported wideband P2 and the channel situation of all subbands within the system bandwidth.
  • the wideband part PMI of the set P1 (shorted as "wideband P1" hereinafter) is calculated based on the most recently reported wideband P2 and the most recently reported RI based on the channel situation of all subbands within the system bandwidth.
  • the wideband CQI is calculated based on the most recently reported RI, wideband P1 and wideband P2 based on the channel situation of all subbands within the system bandwidth.
  • the subband P1 (i.e., the subband part PMI of P1) is calculated based on the most recently reported RI, wideband P1 and wideband P2 based on the channel situation of a preferred subband selected from N j subbands of BP j .
  • the subband CQI is calculated based on the most recently reported RI, wideband P2 and subband P1 based on the channel situation of a preferred subband selected from N j subbands of BP j .
  • the periodicity N2 pd and offset N2 offset of the other set of wideband PMI feedback is configured by higher layer signaling independently, this set of PMI feedback is referred to as P2.
  • This wideband PMI indicates a precoding matrix selected from the precoding codebook set configured for this PMI based on the channel situation of all subbands within the system bandwidth, e.g., a proper precoding matrix selected from the precoding codebook set of the vertical antenna direction.
  • an embodiment of the present disclosure provides following determination methods.
  • the higher layer signaling configures that the periodicity and the offset of the RI and those of the subband CQI feedback are determined based on the periodicity and the offset of one of the two sets of PMI feedback. This method is relatively flexible.
  • the periodicity and offset of the RI and CQI feedback may be determined based on the periodicity and the offset of the horizontal wideband PMI feedback.
  • the periodicity and the offset of the RI and those of the subband CQI feedback are determined based on the periodicity and the offset of the double codebook PMI feedback.
  • the periodicity and the offset of the RI and those of the subband CQI feedback are determined based on the UE selected subband PMI.
  • the periodicity and the offset of the RI and those of the subband CQI feedback are determined based on the periodicity and the offset of the UE selected subband PMI for the horizontal antenna array and adopting double codebooks.
  • the feedback type of the UE is the UE selected subband feedback type (i.e., periodic PUCCH feedback mode 2-1).
  • the UE is configured with two sets of PMI feedback, one is for horizontal PMI feedback and the other is for vertical PMI feedback.
  • the horizontal PMI feedback uses double codebooks, and the vertical PMI feedback uses single codebook.
  • the vertical PMI feedback is wideband PMI feedback and the horizontal PMI feedback is UE selected subband PMI feedback.
  • the periodicity and offset of the RI and subband CQI/PMI feedback are determined based on the periodicity and offset of the UE selected subband PMI feedback, and the UE selected subband PMI feedback is the horizontal PMI feedback.
  • Feedback manner 3 one set of UE selected subband PMI feedback, one set of BP PMI feedback (BP PMI feedback denotes that the PMI is obtained based on the channel situation of all subbands of the BP), and one set of subband CQI feedback.
  • the UE reports wideband PMI at some instances for reporting PMI, i.e., select one precoding matrix from the codebook set based on the channel situation of all S subbands within the system bandwidth; the UE reports BP PMI at other instances for reporting PMI, i.e., select a precoding matrix from the codebook set based on the channel situation of all subbands in the BP of the system bandwidth.
  • the BP PMI feedback may be single codebook PMI feedback or double codebook PMI feedback.
  • the UE reports BP PMI at all instances for reporting PMI, i.e., the UE selects one precoding matrix from the codebook set based on the channel situation of all subbands in the BP of the system bandwidth.
  • the UE reports wideband PMI at some instances for reporting PMI, i.e., select one precoding matrix from the codebook set based on the channel situation of all S subbands within the system bandwidth; the UE reports UE selected subband PMI at other instances for reporting PMI, i.e., the UE selects one precoding matrix from the codebook set based on the channel situation of a preferred subband in the BP of the system bandwidth.
  • the two sets of PMI may match, because one PMI is with respect to the channel situation of all subbands in the BP, and the other PMI is the UE selected subband PMI, i.e., with respect to the channel situation of the preferred subband in the BP.
  • the other PMI feedback is with respect to the channel quality of all subbands in the BP
  • the subband for the UE selected subband PMI feedback is within the BP.
  • the UE selected subband PMI feedback may be single codebook PMI feedback, or double codebook PMI feedback. According to this PMI feedback manner, the two sets of PMI are match.
  • the periodicity and the offset of the BP PMI feedback and those of the UE selected subband feedback are configured by higher layer signaling independently.
  • the periodicity and the offset of one PMI feedback is N1 pd and N1 offset , this PMI feedback is denoted by P1.
  • the periodicity and the offset of the other PMI feedback are respectively N2 pd and N2 offset , this set of PMI is referred to as P2.
  • the PMI feedback for the vertical antenna array is BP PMI feedback
  • the PMI feedback for the horizontal antenna array is UE selected subband PMI feedback.
  • the UE may have different moving speeds on the horizontal direction and the vertical direction, it is appropriate to configure the periodicity and offset of the BP PMI and the periodicity and the offset of the UE selected subband PMI feedback independently.
  • the periodicity and the offset of the BP PMI and those of the UE selected subband PMI feedback may be the same and are configured by the higher layer signaling.
  • the PMI feedback for the horizontal antenna array may be the UE selected subband PMI feedback
  • the PMI feedback for the vertical antenna array may be the BP PMI feedback. Since the PMI feedback of the vertical antenna array is mainly used for beamforming whereas the PMI feedback of the horizontal antenna array is used for spatial multiplexing and beamforming, the beamforming is not sensitive to frequency selectivity but the spatial multiplexing is, such configuration may have a better performance.
  • the double codebook PMI feedback is the UE selected subband PMI feedback
  • the single codebook PMI feedback is the BP PMI feedback. Since the double codebook PMI feedback is used for only the subband PMI feedback at present, the single codebook PMI feedback is used for the wideband PMI feedback.
  • the periodicity and the offset of the RI feedback and the periodicity and the offset of the subband CQI feedback are determined based on the periodicity and the offset of one of the two sets of PMI feedback. For example, the periodicity and the offset of the RI feedback and the periodicity and the offset of the subband CQI feedback are determined based on the periodicity N1 pd and offset N1 offset , i.e.,
  • wideband CQI/wideband PMI or subband CQI/subband PMI are reported in subframes satisfying ;
  • RI is reported in subframes satisfying , wherein N OFFSET,RI denotes the offset of the RI report in the time domain, M RI denotes a multiple of the RI reporting periodicity compared to the CQI reporting periodicity.
  • RI is calculated based on the most recently reported wideband P2 and the channel situation of all subbands with the system bandwidth.
  • the wideband PMI P1 is calculated based on the most recently reported wideband P2 and the most recently reported RI based on the channel situation of all subbands within the system bandwidth.
  • the wideband CQI is calculated based on the most recently reported RI, wideband P1 and wideband P2 based on the channel situation of all subbands within the system bandwidth.
  • the subband PMI P1 is calculated based on the most recently reported RI, wideband P1 and BPP1 based on the channel situation of a preferred subband selected from N j subbands of BP j .
  • the subband CQI is calculated based on the most recently reported RI, subband P1 and BP P2 based on the channel situation of a preferred subband selected from N j subbands of BP j .
  • the periodicity N2 pd and offset N2 offset of the other set of PMI feedback is configured by higher layer signaling independently.
  • an embodiment of the present disclosure provides following determination methods.
  • the periodicity and the offset of the RI and subband CQI feedback are based on the periodicity and the offset of one set of PMI feedback, which is flexible.
  • the periodicity and the offset of the RI and CQI feedback may be determined based on the periodicity and the offset of the horizontal wideband PMI feedback.
  • the periodicity and the offset of the RI and subband CQI feedback are determined based on the periodicity and the offset of the double codebook PMI feedback.
  • the periodicity and the offset of the RI and subband CQI feedback are determined based on the UE selected subband PMI.
  • the feedback type of the UE is the UE selected subband feedback type (i.e., periodic PUCCH feedback mode 2-1).
  • the UE is configured with two sets of PMI feedback, one is for horizontal PMI feedback and the other is for vertical PMI feedback.
  • the horizontal PMI feedback uses double codebooks, and the vertical PMI feedback adopts single codebook.
  • the vertical PMI feedback is BP PMI feedback and the horizontal PMI feedback is UE selected subband PMI feedback.
  • the periodicity and offset of the RI and subband CQI/PMI feedback are determined based on the periodicity and the offset of the UE selected subband PMI feedback, and the UE selected subband PMI feedback is the horizontal PMI feedback.
  • Feedback manner 4 two sets of UE selected subband PMI feedback and one set of subband CQI feedback
  • the two sets of PMI feedback are both UE selected subband PMI feedback
  • the subbands selected by the two sets of PMI may be different, thus the two sets of PMI may be not match and a proper subband CQI cannot be obtained.
  • the periodicity and the offset of the two sets of subband PMI are the same, i.e., the two sets of subband PMI are reported in the same subframe.
  • the periodicity and offset of the two sets of subband PMI are configured by higher layer signaling.
  • the UE selects a subband with a maximum CQI value based on the situation of the two sets of PMI, and takes the corresponding PMI as the two sets of PMI to be reported.
  • the CSI feedback type of the UE is periodic mode 2-1(Mode 2-1)
  • the UE adopts feedback manner 3 in the first method for the CSI feedback, i.e., report one set of BP PMI feedback and one set of subband PMI feedback. According to this method, the two sets of PMI are match in the frequency domain.
  • the feedback of the subband PMI makes the PMI feedback reflect the frequency selectivity of the channel better.
  • the CSI feedback on the PUCCH adopts subband PMI feedback only when the PMI feedback uses double codebooks. If the PMI feedback uses single codebook, the PMI feedback adopts wideband PMI feedback.
  • the method for calculating the PMI (BP PMI) based on the channel situation of the BP in the feedback manner 3 does not exist at present, there is only method for the subband PMI and wideband PMI at present.
  • the UE adopts the feedback manner 2 in the first method for the CSI feedback, i.e., one set of wideband PMI feedback and one set of subband PMI feedback, since this method may make the two sets of PMI match in the frequency domain.
  • the subband PMI and wideband PMI in the feedback manner 2 are both existing PMI formats at present.
  • the UE adopts the feedback manner 1 in the first method for the CSI feedback, i.e., two sets of wideband PMI feedback, since this method may make the two sets of PMI match in the frequency domain.
  • the UE adopts the feedback manner 2 in the first method for the CSI feedback.
  • the PMI feedback uses double codebooks is adopted for the subband PMI feedback
  • the PMI feedback uses single codebook is adopted for the wideband PMI feedback, since this method may make the two sets of PMI match in the frequency domain.
  • the subband PMI feedback may make the PMI feedback reflect the frequency selectivity of the channel better.
  • the subband PMI feedback is adopted only when the double codebooks are used for the PMI feedback, the wideband PMI feedback is adopted for the single codebook PMI feedback. Therefore, if the CSI feedback type configured by the UE is periodic mode 2-1 (Mode 2-1), the UE adopts feedback manner 2 in the first method for the CSI feedback, because this method may make the two sets of PMI match.
  • the subband PMI and the wideband PMI in the feedback manner 2 are both existing PMI formats at present.
  • the UE adopts the feedback manner 1 in the first method for the CSI feedback, i.e., report two sets of wideband PMI, because this method may make the two sets of PMI match in the frequency domain.
  • both of the two sets of PMI use the single codebook
  • the CSI feedback type configured for the UE is periodic mode 2-1 (Mode 2-1)
  • the UE adopts the feedback manner 1 in the first method for the CSI feedback.
  • the subband PMI feedback is adopted only when the double codebooks are used for the PMI feedback, the wideband PMI feedback is adopted for the single codebook PMI feedback.
  • the UE adopts the feedback manner 1 in the first method for the CSI feedback, i.e., report two sets of wideband PMI feedback, because this method may make the two sets of PMI match in the frequency domain.
  • the wideband PMI in the feedback manner 1 is existing PMI format at present.
  • an embodiment of the present disclosure provides an apparatus for reporting channel state information.
  • FIG. 6 is a schematic diagram illustrating a structure of a CSI reporting apparatus according to an embodiment of the present disclosure.
  • the apparatus includes: a configuration information obtaining module(601), a reporting method determining module(603) and a reporting module(605); wherein
  • the configuration information obtaining module(601) is adapted to obtain CSI report configuration corresponding to 2D antenna configuration
  • the reporting method determining module(603) is adapted to determine a CSI reporting method based on the CSI report configuration
  • the reporting module(605) is adapted to report the CSI based on the CSI reporting method.
  • the reported CSI matches with the practical channel performance, system performance may be improved and throughput of downlink service may be increased.

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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 système de communication de pré-5e génération (5G) ou 5G devant être mis en œuvre pour prendre en charge des débits de données supérieurs à ceux d'un système de communication de 4e génération (4G) tel que la technologie d'évolution à long terme (LTE). Des modes de réalisation de la présente invention concernent un procédé de notification d'informations relatives à l'état du canal (CSI). Tout d'abord, un équipement utilisateur (UE) obtient une configuration de notification de CSI correspondant à une configuration d'antenne 2D; ensuite, l'UE détermine un procédé de notification de CSI en se basant sur la configuration de notification de CSI; et enfin, l'UE rend compte des CSI en se basant sur le procédé de notification de CSI. La présente invention concerne également un appareil de notification de CSI. Selon la solution technique fournie par la présente invention, il est fait en sorte que le CQI (Indicateur de qualité de canal) notifié à l'équipement utilisateur et les caractéristiques pratiques du canal sont en adéquation. Par conséquent, la capacité du système est améliorée.
PCT/KR2015/012304 2014-11-14 2015-11-16 Procédé et appareil de transmission d'informations d'état de canal Ceased WO2016076679A1 (fr)

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