WO2017167091A1 - Procédé et dispositif de rétroaction d'informations d'état de canal et support d'informations informatique - Google Patents

Procédé et dispositif de rétroaction d'informations d'état de canal et support d'informations informatique Download PDF

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Publication number
WO2017167091A1
WO2017167091A1 PCT/CN2017/077660 CN2017077660W WO2017167091A1 WO 2017167091 A1 WO2017167091 A1 WO 2017167091A1 CN 2017077660 W CN2017077660 W CN 2017077660W WO 2017167091 A1 WO2017167091 A1 WO 2017167091A1
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WIPO (PCT)
Prior art keywords
feedback
time
type
frequency resource
state information
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PCT/CN2017/077660
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English (en)
Chinese (zh)
Inventor
王瑜新
鲁照华
陈艺戬
李儒岳
肖华华
李永
吴昊
蔡剑兴
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中兴通讯股份有限公司
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Publication of WO2017167091A1 publication Critical patent/WO2017167091A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK

Definitions

  • the present invention relates to the field of intelligent transportation technologies, and in particular, to a method and device for feeding back channel state information, and a computer storage medium.
  • a common reference signal (CRS, Common Reference Signal) is used for pilot measurement and data demodulation, that is, all users use CRS for channel estimation.
  • CRS Common Reference Signal
  • the transmitting end needs to additionally notify the specific precoding matrix (also referred to as precoding weight) information used by the receiving end for data transmission, and the overhead of the pilot is large.
  • precoding matrix also referred to as precoding weight
  • MU-MIMO multi-user multi-input multi-output
  • the DMRS Demodulation Reference Signal
  • CSI-RS Channel State Information Reference Signal
  • CQI Channel Quality Indication
  • MCS modulation and coding
  • the allocation of the CSI-RS does not carry the precoding information.
  • the DMRS is mainly used for the physical downlink shared channel (PDSCH) and the enhanced physical downlink control channel (ePDCCH).
  • LTE and LTE-A systems can be classified into FDD (Frequency Division Duplex) and Time Division Duplex (TDD) systems according to the uplink and downlink duplex modes.
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • CSI-RS and FDD and TDD systems are used.
  • the pattern of the DMRS will vary.
  • FIG. 1 is a schematic diagram of a frame structure of an FDD system according to the related art.
  • the frame structure of the FDD system includes: a radio frame of 10 milliseconds (ms) having twenty lengths of 0.5 ms, numbered from 0 to 19
  • the slots are composed of slots 2i and 2i+1 which constitute a subframe i having a length of 1 ms.
  • FIG. 2 is a schematic diagram of the frame structure of the FDD system according to the related art.
  • a 10 ms radio frame is composed of two half frames of 5 ms length, one field. It includes five subframes of length 1 ms, and subframe i is defined as two slots 2i and 2i+1 of length 0.5 ms.
  • one slot contains seven symbols having a length of 66.7 microseconds (us), wherein the CP length of the first symbol is 5.21 us. The CP length of the remaining 6 symbols is 4.69us.
  • the extended cyclic prefix Extended Cyclic Prefix
  • one slot contains 6 symbols, and the CP length of all symbols is 16.67us.
  • the frame, "S” indicates the special three fields of the downlink pilot time slot (DwPTS, Downlink Pilot Time Slot), the guard interval (GP, Guard Period) and the uplink pilot time slot (UpPTS, Uplink Pilot Time Slot).
  • the control signaling that needs to be transmitted in the uplink has the correct/error acknowledgement message (ACK/NACK, Acknowledgement/Negative Acknowledgement), and three forms reflecting the downlink physical channel state information (CSI, Channel State Information): CQI, Pre-coding matrix indicator (PMI), rank indicator (RI, Rank Indicator).
  • ACK/NACK Acknowledgement/Negative Acknowledgement
  • CSI Channel State Information
  • CQI Pre-coding matrix indicator
  • PMI Pre-coding matrix indicator
  • RI rank indicator
  • the CQI plays a key role in the link adaptation process, which is a message sent by the UE to the eNodeB to describe the downlink channel quality of the current UE.
  • the UE can measure the reference symbols sent by the base station and then calculate the CQI.
  • Massive Multiple Input Multiple Output (Massive Multiple Input Multiple Output) technology is a key enhancement technology in the next generation communication technology.
  • the main feature of the Massive MIMO system is that the base station side is equipped with a large-scale antenna array, which can be used more than Eight antennas transmit, for example, 16 antennas, or 32 antennas, or 64 antennas, or even more antennas.
  • the transmission transmission of more than 8 antennas is Massive MIMO technology.
  • the use of such large-scale multi-antenna technology not only reduces the interference between user channels, but on the other hand, large arrays can also bring about considerable array gain and diversity gain.
  • the space of the base station antenna can be effectively utilized, and multiple antennas can be placed in a small space, thereby obtaining both Massive MIMO in the horizontal direction.
  • the gain in turn, can obtain the Massive MIMO gain in the vertical direction.
  • This is the 3D Massive MIMO (3D Massive MIMO) technology or the Full Dimensional MIMO (FD) technology.
  • the TDD system In order to reduce the resource overhead of the downlink pilot and reduce the feedback amount of the UE, the TDD system often uses the channel reciprocity to obtain the downlink CSI by using the Sounding Reference Signal (SRS), but for the FDD system, due to the uplink.
  • SRS Sounding Reference Signal
  • the base station side uses the channel reciprocity to obtain the downlink CSI by measuring the SRS, which becomes very unreliable, inevitably wastes a large amount of downlink pilot resource overhead and increases the feedback amount of the UE.
  • the UE feedback method has a significant impact on the downlink transmission performance due to the PMI quantization error. Based on this, in the LTE-A or 5G communication system, how to feed back the channel state information is currently a problem to be solved.
  • the embodiment of the present invention provides a method and a device for feeding back channel state information, and a computer storage medium, to at least solve the problem that the feedback of channel state information in the LTE-A or 5G communication system in the related art causes a large amount of downlink pilot resource overhead. Waste and the problem of large feedback.
  • a method for feeding back channel state information includes: receiving configuration signaling of a base station; and feeding back to the base station according to the configuration signaling on a pre-defined or configured time-frequency resource. Downstream channel status information.
  • the feeding back downlink channel state information to the base station on the predefined or configured time-frequency resource according to the configuration signaling includes: selecting one of multiple feedback types or feedback manners according to the configuration signaling
  • the feedback type or the feedback mode feeds back downlink channel state information to the base station on a pre-defined or configured time-frequency resource, where the feedback type or feedback manner includes at least one of the following: quantization feedback, non-quantization feedback, type type Feedback of one, feedback of type type two, feedback of type class A, feedback of type class B.
  • the quantitative feedback is a feedback mode or a feedback type in which the feedback content includes a PMI and/or an RI; and the non-quantized feedback is a feedback mode or a feedback type in which the feedback content does not include the PMI and/or the RI;
  • the feedback of the type type 1 is a feedback mode or a feedback type in which the feedback content includes a PMI and/or an RI; and the feedback of the type 2 is a feedback mode or a feedback type in which the feedback content does not include the PMI and/or the RI; or
  • the feedback of the type 2 is a feedback mode or a feedback type in which the feedback content includes a PMI and/or an RI, and the feedback of the type type 1 is a feedback mode or a feedback type in which the feedback content does not include the PMI and/or the RI;
  • the feedback of the category class A is a feedback mode or a feedback type in which the feedback content includes a PMI and/or an RI
  • the feedback of the category class B is
  • the pre-defined or configured time-frequency resource includes at least one of: a time-frequency resource corresponding to the uplink DMRS, a time-frequency resource corresponding to a time-domain symbol adjacent to the time-domain symbol occupied by the uplink DMRS, The time-frequency resource corresponding to the SRS, all or part of the time-frequency resource corresponding to the physical uplink control channel, all or part of the time-frequency resource corresponding to the physical uplink shared channel, and the time-frequency resource corresponding to the uplink pilot time slot in the special subframe of the TDD.
  • feeding back the downlink channel state information on the predefined or configured time-frequency resource according to the configuration signaling includes: adding the downlink channel state information to the uplink DMRS or the Feedback on the SRS; multiplying the downlink channel state information to the uplink DMRS or the measurement reference signal SRS; and mapping the downlink channel state information to a physical uplink control channel or a physical uplink shared channel Feedback on all or part of the time-frequency resources.
  • the pre-defined or configured time-frequency resource is pre-defined or configured according to the configuration signaling.
  • the reporting of the downlink channel state information to the base station on the time-frequency resource includes: transmitting the SRS on the time-frequency resource corresponding to the uplink pilot time slot of one symbol, and using the uplink pilot time slot of the remaining one or more symbols to carry the Downstream channel status information.
  • the method when the time-frequency resource that is predefined or configured is a time-frequency resource corresponding to the uplink DMRS, the method further includes: when the number of frequency combs of the uplink DMRS is 2, 4 Or 8: The downlink channel state information is carried by using one or more of the frequency combs.
  • the using the one or more frequency combs to carry the downlink channel state information includes: multiplying the downlink channel state information by the uplink DMRS, Mapping to time-frequency resources corresponding to the one or more frequency combs.
  • the configuration signaling is further used to indicate whether the terminal needs to feed back the downlink channel state information, where, by using one of the following manners: using a 1-bit data indication bit in the downlink control signaling, And the 5-bit modulation, coding mode, and the redundancy version indication bit jointly indicate whether the terminal needs to feed back the downlink channel state information; use the CSI request bit in the downlink control signaling and the SRS request bit to jointly indicate whether the terminal needs The downlink channel state information is fed back; the feedback period and the subframe offset are configured for the terminal by using the high layer signaling to indicate whether the terminal needs to feed back the downlink channel state information.
  • the downlink channel state information includes at least one of the following: a signal received by the terminal on a time-frequency resource corresponding to the CSI-RS, and downlink channel information of the base station to the terminal, a covariance matrix information of a downlink channel of the base station to the terminal, a maximum one right singular vector or a maximum two right singular vector information of a covariance matrix of the downlink channel of the base station to the terminal, the base station to Multipath direction information of the downlink channel of the terminal and amplitude information of each path.
  • a method for feeding back channel state information including: sending a configuration command to a terminal, where the configuration signaling is used to notify the terminal of a time-frequency resource in a predefined or configured manner. Upward reporting downlink channel state information to the base station.
  • the feeding back downlink channel state information to the base station on a predefined or configured time-frequency resource includes: selecting a feedback type or a feedback manner from multiple feedback types or feedback modes in a predefined or configured manner.
  • the downlink channel state information is fed back to the base station on the time-frequency resource, where the feedback type or the feedback mode includes at least one of the following: quantization feedback, non-quantization feedback, feedback of type type one, feedback of type type two, type class A feedback, type class B feedback.
  • the quantitative feedback is a feedback mode or a feedback type in which the feedback content includes a PMI and/or an RI; and the non-quantized feedback is a feedback content that does not include a PMI and/or an RI.
  • a feedback mode or a feedback type the feedback of the type type 1 is a feedback mode or a feedback type including a PMI and/or an RI; and the feedback of the type 2 is a feedback that does not include a PMI and/or an RI.
  • the feedback of the type type 2 is that the feedback content includes a feedback mode or a feedback type of the PMI and/or the RI, and the feedback of the type type one is that the feedback content does not include the PMI and/or the RI.
  • the feedback of the category class A is a feedback mode or a feedback type in which the feedback content includes a PMI and/or an RI
  • the feedback of the category class B is feedback that the feedback content does not include the PMI and/or the RI.
  • the feedback of the category class B is that the feedback content includes a feedback mode or a feedback type of the PMI and/or the RI
  • the feedback of the category class A is that the feedback content does not include the PMI and/or the RI. Feedback method or feedback type.
  • the pre-defined or configured time-frequency resource includes at least one of: a time-frequency resource corresponding to the uplink DMRS, a time-frequency resource corresponding to a time-domain symbol adjacent to the time-domain symbol occupied by the uplink DMRS, The time-frequency resource corresponding to the SRS, all or part of the time-frequency resource corresponding to the physical uplink control channel, all or part of the time-frequency resource corresponding to the physical uplink shared channel, and the time-frequency resource corresponding to the uplink pilot time slot in the special subframe of the TDD.
  • the configuration signaling is further used to indicate whether the terminal needs to feed back the downlink channel state information
  • the one bit of the new data indicator bit in the downlink control signaling is used to indicate: And the 5-bit modulation, coding mode, and the redundancy version indication bit jointly indicate whether the terminal needs to feed back the downlink channel state information; use the CSI request bit in the downlink control signaling and the SRS request bit to jointly indicate whether the terminal is The downlink channel state information needs to be fed back; the feedback period and the subframe offset are configured for the terminal by using the high layer signaling to indicate whether the terminal needs to feed back the downlink channel state information.
  • the downlink channel state information includes at least one of the following: a signal received by the terminal on a time-frequency resource corresponding to the CSI-RS, and downlink channel information of the base station to the terminal, Covariance matrix information of a downlink channel of the base station to the terminal, the base station a maximum one right singular vector or a maximum two right singular vector information of a covariance matrix of a downlink channel of the terminal, multipath direction information of the downlink channel of the base station to the terminal, and amplitude information of each path .
  • a feedback device for channel state information including: a receiving module configured to receive configuration signaling of a base station; and a feedback module configured to be pre-defined or according to the configuration signaling The downlink channel state information is fed back to the base station on the configured time-frequency resource.
  • the feedback module includes: a first feedback unit, configured to select one of a plurality of feedback types or feedback manners according to the configuration signaling, and select a feedback type or a feedback manner in a predefined or configured time frequency.
  • the downlink channel state information is fed back to the base station, where the feedback type or the feedback mode includes at least one of the following: quantization feedback, non-quantization feedback, type type one feedback, type type two feedback, type class A Feedback, feedback of category class B.
  • the pre-defined or configured time-frequency resource includes at least one of: a time-frequency resource corresponding to the uplink DMRS, a time-frequency resource corresponding to a time-domain symbol adjacent to the time-domain symbol occupied by the uplink DMRS, The time-frequency resource corresponding to the SRS, all or part of the time-frequency resource corresponding to the physical uplink control channel, all or part of the time-frequency resource corresponding to the physical uplink shared channel, and the time-frequency resource corresponding to the uplink pilot time slot in the special subframe of the TDD.
  • the feedback module includes one of: a second feedback unit configured to superimpose the downlink channel state information on the uplink DMRS or the measurement reference signal SRS; and a third feedback unit,
  • the fourth feedback unit is configured to perform frequency domain expansion on the downlink channel state information and then map to the physical uplink control channel or physical uplink. Feedback on all or part of the time-frequency resources corresponding to the shared channel.
  • the feedback module is further configured to be in the predefined or configured
  • the time-frequency resource is the time-frequency resource corresponding to the uplink pilot time slot in the special subframe of the TDD
  • the SRS is sent on the time-frequency resource corresponding to the uplink pilot time slot of one symbol, and the remaining one or more symbols are used.
  • the uplink pilot time slot carries the downlink channel state information.
  • the apparatus further includes: a bearer module, configured to: when the pre-defined or configured time-frequency resource is a time-frequency resource corresponding to the uplink DMRS, when the frequency comb of the uplink DMRS When the number is 2, 4 or 8, the downlink channel state information is carried by using one or more of the frequency combs.
  • a bearer module configured to: when the pre-defined or configured time-frequency resource is a time-frequency resource corresponding to the uplink DMRS, when the frequency comb of the uplink DMRS When the number is 2, 4 or 8, the downlink channel state information is carried by using one or more of the frequency combs.
  • the bearer module includes: a mapping unit, configured to map a signal obtained by multiplying the downlink channel state information and the uplink DMRS to a time frequency corresponding to the one or more frequency combs Resources.
  • a feedback device for channel state information including: a sending module, configured to send a configuration command to a terminal, where the configuration signaling is used to notify the terminal that it is pre-defined or The downlink channel state information is fed back to the base station on the configured time-frequency resource.
  • feeding back downlink channel state information to the base station on a predefined or configured time-frequency resource includes:
  • a feedback type or a feedback mode from a plurality of feedback types or feedback modes to feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, where the feedback type or feedback manner includes at least the following One: quantized feedback, non-quantitative feedback, feedback of type type one, feedback of type type two, feedback of type class A, feedback of type class B.
  • the pre-defined or configured time-frequency resource includes at least one of: a time-frequency resource corresponding to the uplink DMRS, a time-frequency resource corresponding to a time-domain symbol adjacent to the time-domain symbol occupied by the uplink DMRS, The time-frequency resource corresponding to the SRS, all or part of the time-frequency resource corresponding to the physical uplink control channel, all or part of the time-frequency resource corresponding to the physical uplink shared channel, and the time-frequency resource corresponding to the uplink pilot time slot in the special subframe of the TDD.
  • a computer storage medium storing a computer program configured to perform a feedback method of the channel state information.
  • the configuration signaling of the receiving base station is adopted; the downlink channel state information is fed back to the base station on the pre-defined or configured time-frequency resources according to the configuration signaling, and the LTE-A or 5G communication in the related art is solved.
  • the feedback of the channel state information in the system causes a waste of a large amount of downlink pilot resource overhead and a large amount of feedback, which reduces the waste of downlink pilot resource overhead and the feedback amount of the terminal.
  • FIG. 1 is a schematic diagram 1 of a frame structure of an FDD system according to the related art
  • FIG. 2 is a second schematic diagram of a frame structure of an FDD system according to the related art
  • FIG. 3 is a flowchart of a method for feeding back channel state information according to an embodiment of the present invention.
  • FIG. 4 is a block diagram of a feedback device for channel state information according to an embodiment of the present invention.
  • FIG. 5 is a block diagram 1 of a feedback device for channel state information in accordance with a preferred embodiment of the present invention.
  • FIG. 6 is a block diagram 2 of a feedback device for channel state information in accordance with a preferred embodiment of the present invention.
  • FIG. 7 is a schematic diagram of feeding back downlink channel state information in an uplink pilot time slot of a TDD subframe according to an embodiment of the present invention.
  • FIG. 3 is a method according to the present disclosure.
  • a flowchart of a method for feeding back channel state information in the embodiment, as shown in FIG. 3, includes:
  • Step S302 receiving configuration signaling of the base station
  • Step S304 feeding back downlink channel state information to the base station on the pre-defined or configured time-frequency resource according to the configuration signaling.
  • the feedback of the status information has a problem of waste of a large amount of downlink pilot resource overhead and a large amount of feedback, which reduces the waste of downlink pilot resource overhead and the feedback amount of the terminal.
  • the feeding back downlink channel state information to the base station on the pre-defined or configured time-frequency resource according to the configuration signaling includes: selecting one feedback type from multiple feedback types or feedback manners according to the configuration signaling.
  • the feedback mode feeds back downlink channel state information to the base station on a predefined or configured time-frequency resource, where the feedback type or the feedback mode includes at least one of the following: quantization feedback, non-quantization feedback, type type one feedback, and type Feedback of type 2, feedback of type class A, feedback of type class B.
  • the quantitative feedback is a feedback mode or a feedback type in which the feedback content includes a PMI and/or an RI;
  • the non-quantized feedback is a feedback mode or a feedback type in which the feedback content does not include the PMI and/or the RI;
  • the feedback of type 1 is a feedback mode or a feedback type in which the feedback content includes PMI and/or RI;
  • the feedback of the type 2 is a feedback mode or a feedback type in which the feedback content does not include PMI and/or RI; or, the type type type
  • the feedback of the second part is that the feedback content includes a feedback mode or a feedback type of PMI and/or RI, and the feedback of the type type 1 is a feedback mode or a feedback type in which the feedback content does not include PMI and/or RI; feedback of the category class A
  • the feedback content includes a feedback mode or a feedback type of the PMI and/or the RI.
  • the feedback of the class B is that the feedback content does not include the feedback mode or the feedback type of the PMI and/or the RI; or the feedback of the class B is
  • the feedback content includes the feedback mode or feedback type of PMI and/or RI.
  • the feedback of the category class A is a feedback mode or feedback type in which the feedback content does not include PMI and/or RI.
  • the pre-defined or configured time-frequency resource includes at least one of: a time-frequency resource corresponding to the uplink DMRS, a time-frequency resource corresponding to a time-domain symbol adjacent to the time-domain symbol occupied by the uplink DMRS, and an SRS.
  • the downlink channel state information is fed back to the pre-defined or configured time-frequency resource according to the configuration signaling, including: adding the downlink channel state information to the uplink DMRS or the SRS feedback; The downlink channel state information is multiplied to the uplink DMRS or the SRS feedback; the downlink channel state information is frequency domain extended and then mapped to all or part of the time-frequency resources corresponding to the physical uplink control channel or the physical uplink shared channel.
  • the time-frequency is predefined or configured according to the configuration signaling.
  • the feeding back the downlink channel state information to the base station includes: transmitting the SRS on the time-frequency resource corresponding to the uplink pilot time slot of one symbol, and using the uplink pilot time slot of the remaining one or more symbols to carry the downlink channel state information. .
  • the method when the time-frequency resource of the uplink DMRS is the time-frequency resource corresponding to the uplink DMRS, the method further includes: when the number of frequency combs of the uplink DMRS is 2, 4, or 8, The downlink channel state information is carried by using one or more of the frequency combs.
  • the using one or more frequency combs to carry the downlink channel state information includes: mapping the downlink channel state information to the uplink DMRS, and mapping the signal to the one or more frequency combs Corresponding time-frequency resources.
  • the configuration signaling is further used to indicate whether the terminal needs to feed back the downlink channel state information, where, by using one of the following manners: using 1 in the downlink control signaling
  • the bit data indication bit, and the 5-bit modulation, coding mode, and redundancy version indication bit jointly indicate whether the terminal needs to feed back the downlink channel state information; jointly indicate the terminal by using a CSI request bit and an SRS request bit in the downlink control signaling. Whether the downlink channel state information needs to be fed back; the feedback period and the subframe offset are configured for the terminal by using the high layer signaling to indicate whether the terminal needs to feed back the downlink channel state information.
  • the downlink channel state information includes at least one of the following: a signal received by the terminal on a time-frequency resource corresponding to the CSI-RS, and downlink channel information of the base station to the terminal, and the base station to the terminal.
  • the covariance matrix information of the downlink channel, the largest one right singular vector or the largest two right singular vector information of the covariance matrix of the downlink channel of the base station to the terminal, and the multipath direction of the downlink channel of the base station to the terminal Information and amplitude information for each path.
  • the embodiment of the present invention further provides a method for feeding back channel state information, including: sending a configuration command to a terminal, where the configuration signaling is used to notify the terminal to feed back a downlink channel state to the base station on a predefined or configured time-frequency resource. information.
  • the feeding back downlink channel state information to the base station on a predefined or configured time-frequency resource includes: selecting a feedback type or a feedback mode from multiple feedback types or feedback modes when predefined or configured.
  • the downlink channel state information is fed back to the base station on the frequency resource, where the feedback type or the feedback mode includes at least one of the following: quantization feedback, non-quantitative feedback, feedback of type type one, feedback of type type two, feedback of type class A , type class B feedback.
  • the quantitative feedback is a feedback mode or a feedback type in which the feedback content includes a PMI and/or an RI;
  • the non-quantized feedback is a feedback mode or a feedback type in which the feedback content does not include the PMI and/or the RI;
  • the feedback of type 1 is a feedback mode or a feedback type in which the feedback content includes PMI and/or RI;
  • the feedback of the type 2 is a feedback mode or a feedback type in which the feedback content does not include PMI and/or RI; or, the type type type
  • the feedback of the second part is that the feedback content includes a feedback mode or a feedback type of PMI and/or RI, and the feedback of the type type one is feedback content.
  • the feedback mode or the feedback type of the PMI and/or the RI is not included; the feedback of the class A is that the feedback content includes the feedback mode or the feedback type of the PMI and/or the RI, and the feedback of the class B is that the feedback content does not include The feedback mode or the feedback type of the PMI and/or the RI; or the feedback of the class B is the feedback mode or the feedback type including the PMI and/or the RI, and the feedback of the class A is that the feedback content does not include the PMI. And/or RI feedback or feedback type.
  • the pre-defined or configured time-frequency resource includes at least one of: a time-frequency resource corresponding to the uplink DMRS, a time-frequency resource corresponding to a time-domain symbol adjacent to the time-domain symbol occupied by the uplink DMRS, and an SRS.
  • the configuration signaling is further used to indicate whether the terminal needs to feed back the downlink channel state information, where, by using one of the following manners: using a 1-bit new data indicator bit in the downlink control signaling, and The bit modulation, the coding mode, and the redundancy version indication bit jointly indicate whether the terminal needs to feed back the downlink channel state information; and the CSI request bit and the SRS request bit in the downlink control signaling jointly indicate whether the terminal needs to feed back the downlink channel state.
  • the information is configured by the high-level signaling to configure the feedback period and the subframe offset to indicate whether the terminal needs to feed back the downlink channel state information.
  • the downlink channel state information includes at least one of the following: a signal received by the terminal on a time-frequency resource corresponding to the CSI-RS, and downlink channel information of the base station to the terminal, and the base station to the terminal.
  • the covariance matrix information of the downlink channel, the largest one right singular vector or the largest two right singular vector information of the covariance matrix of the downlink channel of the base station to the terminal, and the multipath direction of the downlink channel of the base station to the terminal Information and amplitude information for each path.
  • FIG. 4 is a block diagram of a feedback device for channel state information according to an embodiment of the present invention. As shown in FIG. 4, the method includes:
  • the receiving module 42 is configured to receive configuration signaling of the base station
  • the feedback module 44 is configured to feed back downlink channel state information to the base station on the predefined or configured time-frequency resources according to the configuration signaling.
  • FIG. 5 is a block diagram of a feedback device for channel state information according to a preferred embodiment of the present invention. As shown in FIG. 5, the feedback module 44 includes:
  • the first feedback unit 52 is configured to: according to the configuration signaling, select one feedback type or feedback manner from multiple feedback types or feedback manners to feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, where
  • the feedback type or the feedback manner includes at least one of the following: quantization feedback, non-quantitative feedback, feedback of type type one, feedback of type type two, feedback of category class A, and feedback of category class B.
  • the pre-defined or configured time-frequency resource includes at least one of: a time-frequency resource corresponding to the uplink DMRS, a time-frequency resource corresponding to a time-domain symbol adjacent to the time-domain symbol occupied by the uplink DMRS, and an SRS.
  • the feedback module 44 includes one of the following:
  • the second feedback unit 62 is configured to superimpose the downlink channel state information on the uplink DMRS or the SRS feedback;
  • the third feedback unit 64 is configured to multiply the downlink channel state information to the uplink DMRS or the SRS feedback;
  • the fourth feedback unit 66 is configured to perform frequency domain extension on the downlink channel state information and then map to all or part of the time-frequency resources corresponding to the physical uplink control channel or the physical uplink shared channel for feedback.
  • the feedback module 44 is further configured to be in the pre-defined or configured time
  • the frequency resource is a time-frequency resource corresponding to the uplink pilot time slot in the special subframe of the TDD
  • the SRS is sent on the time-frequency resource corresponding to the uplink pilot time slot of one symbol, and the remaining one or more symbols are used.
  • the uplink pilot time slot carries the downlink channel state information.
  • the apparatus further includes: a bearer module, configured to: when the time-frequency resource of the uplink DMRS is the time-frequency resource corresponding to the uplink DMRS, At 4 or 8, the downlink channel state information is carried using one or more of the frequency combs.
  • a bearer module configured to: when the time-frequency resource of the uplink DMRS is the time-frequency resource corresponding to the uplink DMRS, At 4 or 8, the downlink channel state information is carried using one or more of the frequency combs.
  • the bearer module includes: a mapping unit configured to map the signal obtained by multiplying the downlink channel state information and the uplink DMRS to a time-frequency resource corresponding to the one or more frequency combs.
  • the embodiment of the present invention further provides a channel state information feedback device, including: a sending module, configured to send a configuration command to the terminal, where the configuration signaling is used to notify the terminal to the predefined or configured time-frequency resource
  • the base station feeds back downlink channel state information.
  • feeding back downlink channel state information to the base station on a predefined or configured time-frequency resource includes:
  • a feedback type or a feedback mode from a plurality of feedback types or feedback modes to feed back downlink channel state information to the base station on a predefined or configured time-frequency resource, where the feedback type or feedback manner includes at least the following One: quantized feedback, non-quantitative feedback, feedback of type type one, feedback of type type two, feedback of type class A, feedback of type class B.
  • the pre-defined or configured time-frequency resource includes at least one of: a time-frequency resource corresponding to the uplink DMRS, a time-frequency resource corresponding to a time-domain symbol adjacent to the time-domain symbol occupied by the uplink DMRS, The time-frequency resource corresponding to the SRS, all or part of the time-frequency resource corresponding to the physical uplink control channel, all or part of the time-frequency resource corresponding to the physical uplink shared channel, and the time-frequency resource corresponding to the uplink pilot time slot in the special subframe of the TDD.
  • each module in the feedback device of the channel state information is implemented by each module.
  • the function may be a central processing unit (CPU) in a feedback device of channel state information, or a microprocessor (MPU, Micro Processor Unit), or a digital signal processor (DSP), or Field Programmable Gate Array (FPGA) implementation.
  • CPU central processing unit
  • MPU Microprocessor
  • DSP digital signal processor
  • FPGA Field Programmable Gate Array
  • the base station side notifies the user terminal to feed back the downlink channel state information on the predefined or configured time-frequency resource, where the predefined or configured time-frequency resource includes: the time-frequency resource corresponding to the uplink DMRS;
  • the DMRS sequence on one of the frequency combs (such as comb 0) is used for channel estimation, and the other frequency comb (such as comb 1) is used.
  • the DMRS sequence on one of the frequency combs (such as comb 0) is used for channel estimation, and the other three frequency combs (such as comb 1 and comb 2) And comb 3) is used to carry downlink channel state information that needs feedback.
  • the base station side notifies the user terminal to feed back the downlink channel state information on the predefined or configured time-frequency resources, where the predefined or configured time-frequency resources include: the uplink guide in the special subframe of the TDD. Time-frequency resources corresponding to frequency slots;
  • FIG. 7 is a schematic diagram of feeding back downlink channel state information in an uplink pilot slot of a TDD subframe according to an embodiment of the present invention.
  • the first UpPTS symbol symbol adjacent to the GP
  • the second to sixth UpPTS symbols are used to carry the elements A0, A1, A2, A3 of the downlink channel state information.
  • the base station side notifies the user terminal to feed back the downlink channel state information on the predefined or configured time-frequency resource
  • the predefined or configured time-frequency resource includes: the time-frequency resource corresponding to the uplink DMRS, The time-frequency resource corresponding to the SRS, all or part of the time-frequency resource corresponding to the physical uplink control channel, all or part of the time-frequency resource corresponding to the physical uplink shared channel, and the time-frequency resource corresponding to the uplink pilot time slot in the special subframe of the TDD.
  • the 1-bit new data indicator bit and the 5-bit modulation and coding mode and the redundancy version indicator bit in the downlink control signaling are used to jointly indicate whether the user terminal needs to feed back downlink channel state information;
  • DCI format 0 or DCI format 4 for DCI format 4, take transport block 1 or transport block 2 corresponding to 1 bit new
  • Data indication bit and 5-bit modulation and coding mode and redundancy version indication bit when the value of the new data indication bit is 1 and the modulation and coding mode and the redundancy version indication bit are 29 or 30 or 31, Then, the analog feedback is triggered, and the user terminal needs to feed back the downlink channel state information to the base station.
  • the CSI request bit and the SRS request bit in the downlink control signaling are used to jointly indicate whether the user terminal needs to feed back downlink channel state information, for example, when the status of the CSI request bit is “01” or “10” or “11” and the SRS If the bit status is "1" or "01” or “10” or “11”, it means that the analog feedback is triggered, and the user terminal needs to feed back the downlink channel state information to the base station.
  • the base station configures the feedback period and the subframe offset for the user terminal by using the high layer signaling to indicate that the user terminal feeds back the downlink channel state information to the base station.
  • n s is the slot number in the radio frame
  • T AF is the feedback period
  • ⁇ AF is the subframe offset
  • the analog feedback period should be a subset of the user-specific SRS period; when the downlink channel state information is carried on the PUCCH, if the current subframe has to feed back the periodic CQI, To perform analog feedback, only CQI is passed for analog feedback, or only analog feedback is passed without CQI.
  • the base station side notifies the user terminal to select a feedback similar or feedback mode to feed back the downlink channel state information to the base station, where the feedback type or the feedback mode includes at least the following One:
  • Quantization feedback non-quantitative feedback, feedback of type type one, feedback of type type two, feedback of type class A, feedback of type class B.
  • the quantitative feedback is that the feedback content includes a feedback mode or a feedback type of PMI and/or RI; the non-quantized feedback is a feedback mode or a feedback type in which the feedback content does not include PMI and/or RI;
  • the feedback of the type type 1 is a feedback mode or a feedback type including a PMI and/or an RI;
  • the feedback of the type 2 is a feedback mode or a feedback type in which the feedback content does not include the PMI and/or the RI; or
  • the feedback of type 2 is that the feedback content includes the feedback mode or feedback type of PMI and/or RI;
  • the feedback of type type one is the feedback mode or feedback type of the feedback content that does not include PMI and/or RI.
  • the feedback of the category class A is that the feedback content includes the feedback mode or the feedback type of the PMI and/or the RI; the feedback of the category class B is that the feedback content does not include the feedback of the PMI and/or the RI.
  • the user terminal calculates the PMI/RI/CQI by measuring the CSI-RS, and then feeds the PMI/RI/CQI to the base station;
  • the user terminal calculates the downlink channel information of the base station to the terminal by measuring the CSI-RS. Or calculating the covariance matrix information of the downlink channel of the base station to the terminal or the largest one right singular vector or the largest two right singular vector information of the covariance matrix, or calculating the multipath of the downlink channel of the base station to the terminal Direction information and amplitude information of each path, and then fed back to the base station;
  • the user terminal receives the signal on the CSI-RS time-frequency resource, superimposes or Multiplying to the uplink SRS or the uplink DMRS, in this way, feeding back channel state information to the base station.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • an embodiment of the present invention further provides a computer storage medium in which a calculation is stored.
  • the computer program is configured to perform a feedback method of channel state information in an embodiment of the present invention.
  • the configuration signaling of the receiving base station is adopted; the downlink channel state information is fed back to the base station on the pre-defined or configured time-frequency resources according to the configuration signaling, and the feedback of the channel state information is solved, which causes a large number of downlinks.
  • the waste of pilot resource overhead and the large amount of feedback reduce the waste of downlink pilot resource overhead and the feedback amount of the terminal.

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

Abstract

L'invention concerne un procédé et un dispositif de rétroaction d'informations d'état de canal et un support d'informations informatique, le procédé consistant : à recevoir une signalisation de configuration d'une station de base ; et à renvoyer, sur une ressource temps-fréquence prédéfinie ou configurée, des informations d'état de canal de liaison descendante à la station de base en fonction de la signalisation de configuration.
PCT/CN2017/077660 2016-04-01 2017-03-22 Procédé et dispositif de rétroaction d'informations d'état de canal et support d'informations informatique WO2017167091A1 (fr)

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CN114128163B (zh) * 2019-01-28 2024-05-17 华为技术有限公司 一种通信方法及装置
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