WO2017076281A1 - Procédé de retour d'information d'état de canal et procédé et appareil de configuration de fréquence pilote de mesure - Google Patents

Procédé de retour d'information d'état de canal et procédé et appareil de configuration de fréquence pilote de mesure Download PDF

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Publication number
WO2017076281A1
WO2017076281A1 PCT/CN2016/104254 CN2016104254W WO2017076281A1 WO 2017076281 A1 WO2017076281 A1 WO 2017076281A1 CN 2016104254 W CN2016104254 W CN 2016104254W WO 2017076281 A1 WO2017076281 A1 WO 2017076281A1
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WIPO (PCT)
Prior art keywords
feedback
pilot resource
measurement pilot
pilots
channel
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PCT/CN2016/104254
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English (en)
Chinese (zh)
Inventor
陈艺戬
李儒岳
肖华华
鲁照华
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 WO2017076281A1 publication Critical patent/WO2017076281A1/fr

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    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/0486—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking channel rank into account
    • 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
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the present invention relates to the field of communications, and in particular to a method for feeding back channel state information, a method and a device for configuring a pilot.
  • a transmitting end and a receiving end use a plurality of antennas to obtain a higher rate in a spatial multiplexing manner.
  • an enhanced technology is that the receiving end feeds back the channel information of the transmitting end, and the transmitting end uses the transmitting precoding technology according to the obtained channel information, which can greatly improve the transmission performance.
  • SU-MIMO single-user multiple-input multiple-output
  • MIMO Multi-input Multi-output, multiple-input multiple-output
  • channel feature vector information is used for precoding directly; for multi-user MIMO (MU-MIMO) , need more accurate channel information.
  • the following describes some basic contents related to the acquisition of CSI (channel state information, including channel part and interference part) and terminal side CSI quantization feedback.
  • CSI channel state information, including channel part and interference part
  • the uplink channel can be measured by transmitting the SRS and then the downlink channel matrix can be obtained.
  • the FDD system is difficult to obtain accurate CSI information in this way because the uplink and downlink are not in the same frequency band.
  • the following typical CSI feedback scenarios and corresponding feedback techniques exist in the FDD system; if the supported antenna dimensions are small, less than or equal to 8 antennas, the channel measurement pilot and CSI feedback overhead are generally considered acceptable, for the sake of simplicity. Full-dimensional measurements and CSI feedback are used.
  • FDD mainly considers this scenario, using full-dimensional pilot and CSI feedback.
  • the feedback adopts implicit feedback.
  • the base station sends a set of channel measurement pilots to the terminal, and the terminal is based on the pilot.
  • the pilot resource can be configured with 2-port CSI-RS, 4-port CSI-RS, and 8-port CSI-RS; the terminal detects these pilots and estimates the channel matrix for channel information quantization; generally the content of the quantized CSI It mainly includes (RI/PMI/CQI): Channel Quality Indication (CQI), Precoding Matrix Indicator (PMI), and Rank Indicator (RI). .
  • CQI Channel Quality Indication
  • PMI Precoding Matrix Indicator
  • RI Rank Indicator
  • CQI is an indicator to measure the quality of downlink channels.
  • CQI can be understood as a kind of quantization of signal to interference and noise ratio SINR.
  • CQI is represented by integer values of 0-15, which respectively represent different CQI levels, and different CQIs correspond to their respective modulation modes and coding codes.
  • Rate (MCS) The RI is used to describe the number of spatially independent channels, corresponding to the rank of the channel response matrix. In the spatial multiplexing mode, the UE needs to feed back the RI information, and the other modes do not need to feed back the RI information.
  • the rank of the channel matrix corresponds to the number of layers.
  • the PMI feeds back the best precoding information, based on the index feedback, indicating the codeword of the agreed codebook that best matches the characteristics of the current channel.
  • CSI feedback mode In order to feedback CQI/PMI/RI, LTE also defines multiple CSI feedback modes, which refer to CSI (CQI/PMI/RI) feedback information combinations, including sub-band feedback and wideband feedback or Selecting M subband feedbacks, etc. includes periodic feedback and aperiodic feedback.
  • the aperiodic feedback is transmitted in the PUSCH, and includes the following modes:
  • the value of x in Mode xy is 1, 2, and 3 respectively represent the feedback characteristics of three CQIs: wideband CQI, subband CQI selected by UE, subband CQI of high layer configuration; value of y includes 0, 1, 2, where 0 represents no PMI, 1 represents 1 (wideband) PMI, and 2 represents multiple PMIs (wideband and one or more subbands);
  • the periodic feedback mode refers to a mode that is fed back periodically in the PUCCH, and includes the following modes:
  • x in Mode xy is 1, and 2 represents the feedback characteristics of two CQIs: wideband CQI, sub-band CQI selected by UE; y takes 0, 1, where 0 means no PMI, 1 means include PMI;
  • Mode 1-1 needs to consider the case of a single PMI codebook and the case of a dual PMI codebook, and is divided into multiple sub-modes;
  • the feedback includes RI feedback, wideband (WB, wideband) PMI i feedback, wideband CQI feedback; as shown in Figure 1; divided into two reporting types; the first reporting type is RI, and the second reporting type is broadband ( WB, wideband) PMI i feedback and wideband CQI feedback.
  • Mode 1-1 submode 1 when dual PMI
  • a codeword requires two PMIs i1 and i2 to indicate together.
  • i1 is broadband feedback long-term feedback
  • i2 can be sub-band short-time feedback; this sub-mode contains two kinds of reporting reporting type: RI /PMI i1 joint coding, and broadband PMI i2and broadband CQI
  • the feedback includes RI feedback, broadband (WB, wideband) PMI i1, broadband PMI i2 feedback, wideband CQI feedback; as shown in Figure 3; divided into two reporting types; the first reporting type is RI, the second The reporting type is broadband (WB, wideband) PMI i1/i2 joint coding feedback and wideband CQI feedback; here i1 and i2 both perform sampling processing of some codebook indexes to reduce overhead;
  • the normal mode Mode 2-1 also needs to consider the case of a single PMI codebook and the case of a dual PMI codebook. In one case, it is not necessary to introduce a PTI (Precoder Type Indicator), and the other case introduces a PTI indication, which can be in the time domain.
  • PTI Precoder Type Indicator
  • the feedback includes RI feedback, wideband (WB, wideband) PMI, and sub-width PMI feedback; as shown in Figure 4; divided into 3 reporting types; the first reporting type is RI, and the second reporting type is broadband ( WB, wideband) PMI feedback and wideband CQI feedback; the third reporting type is subband CQI;
  • the measurement feedback of channel information is divided into two types: Class A and Class B.
  • Class A This kind of measurement feedback method is the channel type and feedback based on the non-precoded pilot used in the earlier version.
  • the feedback PMI is further divided into PMI i1, 1, PMI i1, 2, PMI i2, and the overhead is also extended from the maximum 4 bits of each PMI to more bits.
  • Class B This measurement feedback method is based on the measurement and feedback of the pilot resource selection.
  • CRI CSI-RS Resource Index, channel measurement pilot resource index, often referred to as BI, beam index
  • -RS resource for measurement can be understood as channel letter Part of the feedback, combined with traditional CSI feedback, the base station can obtain the total channel information through CRI and traditional CSI feedback.
  • a typical application of Figure 6 is vertical sector virtualization technology.
  • the base station uses different precoding to generate beams in different directions to cover different vertical directions.
  • the UE selects the best precoding pilot (vertical beam), and then based on the The precoded pilot performs horizontal dimension CSI feedback.
  • the base station obtains relatively complete channel state information based on the reporting of the precoding pilot (vertical beam) selection information of the terminal and the CSI feedback of the horizontal dimension, and the weight used by the precoding pilot;
  • the present invention provides a method and a device for feeding back channel state information, so as to solve at least the problem that the existing feedback mode in the related art is more difficult to deal with the pilot port and the feedback content bit overhead is large.
  • a method for feeding back channel state information includes: determining, by a terminal, a measurement pilot resource set R, where the measurement pilot resource set R includes K sets of pilots, and K is a positive integer greater than 1.
  • the terminal determines a value range of the rank indicator RI when the uplink control channel state information CSI is fed back, and determines a feedback overhead of the channel measurement pilot resource index of the uplink control channel according to the value range; or the terminal according to the The value range and the cost of the precoding matrix indicator PMI jointly determine a feedback overhead of the channel measurement pilot resource index of the uplink control channel, and the terminal determines the selectable according to a preset rule according to the feedback overhead of the channel measurement pilot resource index.
  • pilot resource set R1 is a subset of the measurement pilot resource set R; the terminal performs channel measurement based on channel state information measurement pilot CSI-RS in the pilot resource set R1 And performing pilot resource selection; determining, by the terminal, the channel measurement pilot resource index according to the selected pilot resource, and calculating and guiding Resources corresponding to the RI; the joint terminal and the feedback of the rank indicator measurement pilot channel resource index.
  • a method for feeding back another channel state information including: determining, by a terminal, a measurement pilot resource set R, where the measurement pilot resource set includes a measurement pilot resource set R, the measurement guide
  • the frequency resource set R includes K sets of pilots; K is a positive integer greater than 1; the terminal selects the kth set of K sets of pilots to perform channel state information CSI measurement, where k is a positive integer and k is the following a value: 1, 2, ... K; the terminal determines the value range of the rank indicator RI; the terminal determines from the value range of the RI in the process of measuring according to the measurement pilot The value of the RI; the terminal feeds back the information of the k and the value information of the RI.
  • a method for configuring a channel state information measurement pilot includes: configuring, by a base station, a measurement pilot resource set R for a terminal, where the measurement pilot resource set R includes K sets of pilots Each set of pilots corresponds to N k antenna ports, where k and K are positive integers, and k ⁇ K; the base station sends configuration signaling to the terminal, where the configuration signaling carries the A set of pilot resource sets R is measured.
  • a feedback apparatus for channel state information including: a first determining module, configured to determine a measurement pilot resource set R, where the measurement pilot resource set R includes K sets of pilots, K is a positive integer greater than 1; determining a value range of the rank indicator RI when the uplink control channel state information CSI is fed back, and determining a feedback overhead of the channel measurement pilot resource index of the uplink control channel according to the value range, or Determining the feedback overhead of the channel measurement pilot resource index of the uplink control channel by using the value range and the cost of the precoding matrix indicator PMI, where the feedback overhead of the RI and the channel measurement pilot resource index does not exceed X bits, X
  • the second determining module is configured to determine, according to the feedback overhead of the channel measurement pilot resource index, a selectable pilot resource set R1 according to a preset rule, where the pilot resource set R1 is the measured pilot resource.
  • a third determining module configured to perform channel measurement based on the channel state information measurement pilot CSI-RS in the pilot resource set R1, And performing pilot resource selection, determining the channel measurement pilot resource index according to the selected pilot resource, and calculating an RI corresponding to the pilot resource; and the feedback module is configured to feed back the channel measurement pilot resource index. Taking values and jointly feeding back the rank indicator and the channel measurement pilot resource index.
  • a feedback apparatus for channel state information including: a first determining module, configured to determine a measurement pilot resource set R, the set R includes K sets of pilots; and K is greater than 1.
  • a positive integer; K is a positive integer greater than 1;
  • the measurement module is configured to select the kth set of the K sets of pilots for channel state information CSI measurement, where k is a positive integer and is one of the following values: 2.
  • the second determining module is configured to determine the value range of the RI and determine the value of the RI from the range of values of the RI in the process of measuring according to the measuring pilot; the feedback module, Set to feedback the information of the k and the value information of the RI
  • a configuration apparatus for channel state information measurement pilot comprising: a configuration module, configured to configure a measurement pilot resource set R for a terminal, wherein the measurement pilot resource set R includes K sets of pilots, each set of pilots corresponding to N k antenna ports, where k and K are positive integers, and k is one of the following values: 1, 2, altogether K; sending module, setting The configuration signaling is sent to the terminal, where the configuration signaling resource carries the measurement pilot resource set R.
  • the present invention since the feedback overhead of the RI and the BI is comprehensively considered, the problem that the existing feedback mode in the related art is more difficult to cope with the problem that the pilot port is more and the feedback content bit overhead is larger is solved. Save feedback overhead.
  • Mode 1 is a schematic diagram of feedback contents of Mode 1-1 according to a general mode of the related art
  • Mode 1-1 sub-mode 1 in dual PMI is a schematic diagram of feedback content of Mode 1-1 sub-mode 1 in dual PMI according to the related art
  • FIG. 3 is a schematic diagram of feedback content of Mode 1-1 sub-mode 2 in dual PMI according to the related art
  • FIG. 4 is a schematic diagram of feedback contents of a normal mode Mode 2-1 according to the related art
  • FIG. 5 is a schematic diagram of feedback content of a common mode Mode 2-1 according to the related art
  • FIG. 6 is a schematic diagram of a CSI feedback architecture based on measurement pilot selection according to the related art
  • FIG. 7 is a flowchart of a method for feeding back channel state information according to an embodiment of the present invention.
  • FIG. 8 is a structural block diagram of a feedback apparatus for channel state information according to an embodiment of the present invention.
  • FIG. 9 is a flowchart of another method for feeding back channel state information according to an embodiment of the present invention.
  • FIG. 10 is a structural block diagram of a feedback apparatus for another channel state information according to an embodiment of the present invention.
  • FIG. 11 is a flowchart of a method for configuring a channel state information measurement pilot according to an embodiment of the present invention
  • FIG. 12 is a structural block diagram of a configuration apparatus for channel state information measurement pilot according to an embodiment of the present invention.
  • FIG. 13 is a schematic diagram of feedback contents jointly reported by RI and BI in mode Mode 1-1, Mode 2-1 according to an embodiment of the present invention
  • FIG. 14 is a schematic diagram of joint feedback in mode 2-1 when RI, BI, and PTI are considered in accordance with an embodiment of the present invention
  • FIG. 15 is a schematic diagram of feedback contents when RI, PMIi1, and BI are jointly transmitted according to an alternative embodiment of the present invention.
  • FIG. 7 is a flowchart of a method for feeding back channel state information according to an embodiment of the present invention. As shown in FIG. 7, the process includes the following steps:
  • Step S702 the terminal determines a measurement pilot resource set R, where the measurement pilot resource set R includes K sets of pilots, and K is a positive integer greater than 1.
  • Step S704 the terminal determines a value range of the rank indicator RI when the uplink control channel state information CSI is fed back, and determines a feedback overhead of the channel measurement pilot resource index of the uplink control channel according to the value range; or according to the above value range and
  • the overhead of the precoding matrix indicator PMI jointly determines the feedback overhead of the channel measurement pilot resource index of the uplink control channel, where the feedback overhead of the RI and the channel measurement pilot resource index does not exceed X bits, and X is a positive integer;
  • Step S706 The terminal determines, according to the feedback overhead of the channel measurement pilot resource index, a selectable pilot resource set R1 according to a preset rule, where the pilot resource set R1 is a subset of the foregoing measurement pilot resource set R.
  • Step S708 The terminal performs channel measurement based on the channel state information measurement pilot CSI-RS in the pilot resource set R1, and performs pilot resource selection.
  • the terminal determines the channel measurement pilot resource index according to the selected pilot resource. And calculating an RI corresponding to the pilot resource;
  • Step S710 the terminal jointly feeds back the rank indicator and the channel measurement pilot resource index.
  • the channel measurement pilot resource index can be determined according to the value range of the rank indicator RI, so that the feedback overhead of the feedback content of the terminal can be restricted, thereby saving the feedback overhead of the terminal.
  • the feedback overhead of the channel measurement pilot resource index of the uplink control channel is also determined according to the feedback mode of the channel state information CSI.
  • the feedback overhead of the channel measurement pilot resource index of the uplink control channel is further determined according to the feedback type Reporting type.
  • the preset rule may be implemented in multiple manners, for example, according to rules agreed by the terminal and the base station, where the preset rule includes but is not limited to the following form: the measurement pilot resource set R is included The first K1 set of the K sets of pilots is used as the pilot resource set R1, where K1 is a positive integer and K1 ⁇ K.
  • FIG. 8 is a structural block diagram of a feedback apparatus for channel state information according to an embodiment of the present invention. As shown in Figure 8, the device includes:
  • the first determining module 80 is configured to determine a measurement pilot resource set R, where the measurement pilot resource set R includes K sets of pilots, K is a positive integer greater than 1, and determines a rank indicator for feeding back uplink control channel state information CSI
  • the value range of the RI and determining the feedback overhead of the channel measurement pilot resource index of the uplink control channel according to the value range, or determining the channel of the uplink control channel according to the value range and the overhead of the precoding matrix indicator PMI Measuring a feedback overhead of the pilot resource index, where the feedback overhead of the RI and the channel measurement pilot resource index does not exceed X bits, and X is a positive integer;
  • the second determining module 82 is configured to determine, according to the feedback overhead of the channel measurement pilot resource index, a selectable pilot resource set R1 according to a preset rule, where the pilot resource set R1 is a subset of the foregoing measurement pilot resource set R ;
  • the third determining module 84 is configured to perform channel measurement based on the channel state information measurement pilot CSI-RS in the pilot resource set R1, and perform pilot resource selection, and determine the channel measurement pilot according to the selected pilot resource. a resource index, and calculating an RI corresponding to the pilot resource;
  • the feedback module 86 is configured to feed back the value of the channel measurement pilot resource index and jointly feed back the rank indicator and the channel measurement pilot resource index.
  • the first determining module 82 is configured to determine, according to at least one of the following information, a value range of the RI: a RI value range configuration signaling; a maximum Nk value corresponding to the K sets of pilots, where N k represents the number of antenna ports each pilot has; the minimum N k value corresponding to the K sets of pilots; the value of the first set of pilot ports N1; the value of the pilot sets K.
  • the embodiment of the present invention further provides another method for feeding back channel state information. As shown in FIG. 9, the method includes:
  • Step S902 the terminal determines a measurement pilot resource set R, where the measurement pilot resource set R includes K sets of pilots; K is a positive integer greater than 1.
  • Step S904 the terminal selects the kth set of the K sets of pilots to perform channel state information CSI measurement, where k is a positive integer, and k is one of the following values: 1, 2, . K;
  • Step S906 the terminal determines a value range of the rank indicator RI
  • Step S908 the terminal determines the value of the RI from the value range of the RI in the process of performing measurement according to the measurement pilot;
  • step S910 the terminal feeds back the information of the above k and the value information of the RI.
  • the value range of the RI is determined according to at least one of the following: the RI value range configuration signaling; the minimum number of antenna ports in the K sets of pilots; the maximum number of antenna ports in the K sets of pilots; CSI feedback Mode; feedback type reporting type; size of K; feedback mode: physical uplink control channel PUCCH feedback or physical uplink shared channel PUSCH feedback.
  • the method further includes: the base station configuring a feedback mode of the CSI for the terminal; and the configuration signaling further carries the feedback mode of the CSI.
  • the embodiment of the invention further provides a feedback device for channel state information.
  • the device includes:
  • the first determining module 1002 is configured to determine a measurement pilot resource set R, where the measurement pilot resource set R includes K sets of pilots; K is a positive integer greater than 1; and the measurement module 1004 is configured to select the K sets of pilots.
  • the kth set performs channel state information CSI measurement, where k is a positive integer and is one of the following values: 1, 2, ..., K;
  • the second determining module 1006 is set to determine the value of the RI
  • the range and the value of the RI are determined from the range of values of the RI during the measurement according to the measurement pilot;
  • the feedback module 1008 is configured to feed back the information of the k and the value information of the RI.
  • the foregoing second determining module 1006 is configured to determine, according to one of the following, a value range of the RI: a value range configuration signaling of the RI; a minimum number of antenna ports in the K set pilot; and a K set pilot Maximum number of antenna ports; CSI feedback mode; feedback type reporting type; size of K; feedback mode: physical uplink control channel PUCCH feedback or physical uplink shared channel PUSCH feedback.
  • An embodiment of the present invention further provides a method for configuring a channel state information measurement pilot. As shown in FIG. 11, the method includes:
  • Step S1102 The base station configures a measurement pilot resource set R for the terminal, where the measurement pilot resource set R includes K sets of pilots, and each set of pilots corresponds to N k antenna ports, where k and K are positive integers, and k is one of the following values: 1, 2, ⁇ K;
  • Step S1104 The base station sends configuration signaling to the terminal, where the configuration signaling carries the measurement pilot resource set R.
  • the range of the K value is determined according to at least one of the following information: the terminal level; number of receive antennas of the terminal; N k K sets the maximum of all pilots in the; N k K sets of all pilots in Minimum value; number of ports of the first set of pilots N 1 , feedback mode of channel state information CSI; feedback mode of channel state information CSI;
  • An embodiment of the present invention further provides a device for configuring a channel state information measurement pilot. As shown in FIG. 12, the device includes:
  • the configuration module 1202 is configured to configure a measurement pilot resource set R for the terminal, where the measurement pilot resource set R includes K sets of pilots, and each set of pilots corresponds to N k antenna ports, where k and K are positive integers. And k is one of the following values: 1, 2, . K;
  • the sending module 1204 is configured to send configuration signaling to the terminal, where the configuration signaling carries the measurement pilot resource set R.
  • Embodiment 1 Determination of a range of values of a terminal RI
  • Embodiment 1 The value range of RI is determined by the value of K;
  • the joint coding of RI and BI is considered to reduce the feedback of the Reporting Type number of feedback feedback resources; but the problem is RI and BI.
  • the maximum cost can be 3 bits, so the joint coding of RI and BI will result in a total overhead of 6 bits.
  • the modulation coding scheme adopted by RI and BI will have obvious links when it exceeds 5 bits. The transmission error rate increases, which cannot meet the BER and BI bit error rate requirements, which makes the system performance greatly affected.
  • the preferred method is to further limit the range of RI that can be supported according to the size of K; for example, when the value of K is 8, the range of RI is 4, Even if the UE capability, the number of receiving antennas, and the number of pilot ports support feedback RI>4, feedback of RI>4 is not performed; more restrictions are shown in the following table.
  • the RI range described here is not the final range, and the final range is determined together by considering various constraints, such as UE capability, number of receiving antennas, number of pilot ports, and the like;
  • Embodiment 2 The value range of RI is determined by the value of N k
  • the base station can configure K sets of pilots for the terminal, each set of pilots has N k ports; K is generally less than or equal to 8, and the value of N k can be selected from the set ⁇ 1, 2, 4, 8 ⁇ ;
  • pilot sets corresponding feedback RI is not the same range, but require uniform application of a range of one kind RI; an example shown in the following table, when configuring pilot sets 8
  • the range of RI values is uniform and determined by the maximum value of N k .
  • the maximum N k is 8, so the value range is RI. 1-8; can also be determined by the minimum value of N k , where the largest N k is 2, so the value range is RI 1-2;
  • the RI range described here is not the final range, and the final range is determined together by considering various constraints, such as UE capability, number of receiving antennas, number of pilot ports, and the like;
  • Embodiment 3 Determined by base station configuration signaling
  • the value range of the RI can be set by the base station to limit the value of the RI. For example:
  • RI range meaning 00 RI range ⁇ 1 ⁇ 01 RI range ⁇ 1, 2 ⁇ 10 RI range ⁇ 1, 2, 3, 4 ⁇ 11 RI range ⁇ 1, 2, 3, 4, 5, 6, 7, 8 ⁇
  • the RI range described here is not the final range, and the final range is determined together by considering various constraints, such as UE capability, number of receiving antennas, number of pilot ports, and the like;
  • Embodiment 4 Determined by feedback mode
  • the combined feedback of RI/BI/PTI is considered in mode 2-1. Because the bit error rate of PTI is more demanding in this mode, the range of RI depends not only on the value of RI. In the size of K, in different feedback modes The range is also different; an RI range is determined as shown in the following table.
  • the RI range described here is not the final range, and the final range is determined together by considering various constraints, such as UE capability, number of receiving antennas, number of pilot ports, and the like;
  • RI RI
  • PMIi1 BI joint transmission
  • the range of RI values needs to be determined according to the information size of BI and PMIi1:
  • the RI range described herein is not the final range, and the final range is determined together by considering various restrictions, such as UE capability, number of receiving antennas, number of pilot ports, and the like; as shown in FIG.
  • the terminal determines the range of the RI, and the UE may determine the value range of the RI by using the number of receiving antennas of the terminal, the UE capability, the high-level configuration signaling, and the number of configured pilot resources.
  • One example is:
  • the number of receiving antennas of the UE is 4, the number of layers supported by the UE is 4 layers, and the number of configured pilot resource ports is 8.
  • the RI range supported by the RI is determined to be 1 to 4 according to the principle of the minimum range;
  • Another example is:
  • the terminal determines the range of the RI, the corresponding feedback cost is obtained. For example, when the range is 1 to 2, it is 1 bit, when the range is 1 to 4, it is 2 bits, and when the range is 1 to 8, it is 3 bits.
  • the base station and the terminal can agree on the feedback Type for the feedback mode 1-1 or 2-1. If the joint coding of the RI and the BI information is included, the feedback overhead of the BI is the bit occupied by the Xbit-RI; preferably, the X takes 5 or 4;
  • RI/BI RI/BI/PTI RI/BI/PMI i1 Number of BI bits 5 minus the number of RI bits 4 minus the number of RI bits 5-RI/i1bit number
  • the UE may determine the corresponding pilot set number K1, and then the terminal may select the K1 set as the set of measurement pilot resources in the K sets of pilots configured by the base station (better agreement can be made) For the first to the K1th sets, a set of measurement pilots is selected in the set for measurement and feedback CSI information;
  • the range of values is determined by at least one of the following information:
  • N k is the maximum; minimum value of N k; the CSI feedback mode;
  • UE capability level A B PUCCH feedback K ranges from 1 to 8 UE capability level C PUCCH feedback K ranges from 1 to 4 UE capability level D PUCCH feedback K ranges from 1 to 2
  • UE 1 receiving antenna PUCCH feedback K ranges from 1 to 8 UE 2 receiving antenna PUCCH feedback K ranges from 1 to 8 UE 4 receiving antenna PUCCH feedback K ranges from 1 to 4 UE 8 receiving antenna PUCCH feedback K ranges from 1 to 2
  • the minimum value in N k is 1 PUCCH feedback K ranges from 1 to 8
  • the minimum value in N k is 2 PUCCH feedback K ranges from 1 to 8
  • the minimum value in N k is 4 PUCCH feedback K ranges from 1 to 4
  • the minimum value in N k is 8 PUCCH feedback K ranges from 1 to 2
  • Mode 1-1CSI mode 2 PUCCH feedback K ranges from 1 to 4
  • Mode 1-1CSI mode 1 PUCCH feedback K ranges from 1 to 2
  • Mode 2-1 PUCCH feedback K ranges from 1 to 4
  • RI/BI PUCCH feedback K ranges from 1 to 4 RI/BI/PTI PUCCH feedback K ranges from 1 to 2
  • the maximum cost of each feedback mode may be as follows, which may cause a significant drop in link performance.
  • the introduction of BI and RI joint reporting technology in the case of type will result in a large maximum bit overhead, as shown in the following table.
  • the RI of the UE When the value of K is large, and the RI of the UE is in the range of 1 to 8, the RI may be compressed. For example, the value ranges from 1 to 2 or 1 to 4;
  • Mode 2 Limit the size of the available pilot sets Kpucch on the PUCCH
  • the standard defines the maximum number of pilot sets Kpucch on the PUCCH.
  • the Kpucch needs to be determined according to the RI bit overhead fed back by the UE. As shown in the following table, the RI and BI feedback reporting overhead can be limited to 5 bits.
  • the PUCCH and the PUSCH have different measurement requirements, and the pilot configuration should be separately performed on the PUCCH and the PUSCH.
  • the configuration may be limited; in another case, Selecting a Kpucch set CSI-RS resource from the K sets of CSI-RS resources configured by the base station for channel measurement and feedback on the PUCCH;
  • the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk,
  • the optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods described in various embodiments of the present invention.
  • each of the above modules may be implemented by software or hardware.
  • the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or, the modules are located in multiple In the processor.
  • Embodiments of the present invention also provide a storage medium.
  • the foregoing storage medium may be configured to store program code for performing the steps in the above embodiments.
  • the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • a mobile hard disk e.g., a hard disk
  • magnetic memory e.g., a hard disk
  • the various modules or steps of the present invention described above can be used with general calculations.
  • the devices are implemented, they may be centralized on a single computing device, or distributed over a network of multiple computing devices, optionally they may be implemented in program code executable by the computing device, such that they may be stored Executed by the computing device in a storage device, and in some cases, the steps shown or described may be performed in an order different than that herein, or separately fabricated into individual integrated circuit modules, or Multiple modules or steps are made into a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.
  • the technical solution provided by the embodiment of the present invention can be applied to the feedback process of the channel state information. Since the feedback overhead of the RI and the BI is comprehensively considered, the existing feedback mode in the related art is more difficult to deal with the pilot port. The problem of the problem that the content bit overhead is large is increased, thereby achieving the effect of saving feedback overhead.

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Abstract

La présente invention concerne un procédé de retour d'information d'état de canal, et un procédé et un appareil de configuration de fréquence pilote de mesure, le procédé de rétroaction comprenant les étapes suivantes: un terminal reçoit une commande de configuration d'une station de base; la détermination de la plage de valeurs d'un indicateur de rang (RI) lors de la rétroaction d'information d'état de canal (CSI) de commande d'une liaison montante, et sur la base de la plage de valeurs, la détermination du surdébit de rétroaction d'un indice de ressource de fréquence pilote de mesure de canal du canal de commande de liaison montante; ou sur la base de la plage de valeurs et d'un indicateur de matrice de précodage PMI, la détermination du surdébit de rétroaction de l'indice de ressource de fréquence pilote de mesure de canal du canal de commande de liaison montante; sur la base du surdébit de rétroaction de l'indice de ressource de fréquence pilote de mesure de canal, la détermination selon une règle prédéfinie, d'un ensemble de ressources de fréquence pilote sélectionnable R1, l'ensemble de ressources de fréquence pilote R1 étant un sous-ensemble R; sur la base d'un signal de référence d'information d'état de canal CSI-RS dans l'ensemble de ressources de fréquence pilote R1, l'exécution de mesure de canal, et l'exécution d'une sélection de ressource de fréquence pilote; sur la base de la ressource de fréquence pilote sélectionnée, la détermination de l'indice de ressource de fréquence pilote de mesure de canal, et le calcul d'indicateur de rang RI correspondant à la ressource de fréquence pilote; la combinaison de l'indicateur de rang de rétroaction et l'indice de ressource de fréquence pilote de mesure de canal.
PCT/CN2016/104254 2015-11-06 2016-11-01 Procédé de retour d'information d'état de canal et procédé et appareil de configuration de fréquence pilote de mesure WO2017076281A1 (fr)

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