WO2018056786A1 - 무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 이를 위한 장치 - Google Patents
무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 이를 위한 장치 Download PDFInfo
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- WO2018056786A1 WO2018056786A1 PCT/KR2017/010613 KR2017010613W WO2018056786A1 WO 2018056786 A1 WO2018056786 A1 WO 2018056786A1 KR 2017010613 W KR2017010613 W KR 2017010613W WO 2018056786 A1 WO2018056786 A1 WO 2018056786A1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0426—Power distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B7/0478—Special codebook structures directed to feedback optimisation
- H04B7/0479—Special codebook structures directed to feedback optimisation for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]
-
- 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]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
Definitions
- multiple aptenna systems e.g., 2D AAS, 3D multi-input multi-output (3D-MIMO) system with a massive antenna port.
- a method of transmitting and receiving channel state information in a wireless communication system is proposed.
- An aspect of the present invention provides a method for a user equipment (UE) to report channel state information (CSI) in a wireless communication system, the channel state information being referred to from a base station through multiple antenna ports.
- UE user equipment
- CSI channel state information
- the CSI includes selection information indicating a plurality of codewords used to generate a precoding matrix in a codebook for reporting the CSI, wherein power coefficients and phases are present in each of the plurality of codewords.
- the precoding matrix is generated based on a linear combination of the power coefficient and a plurality of codewords to which the phase coefficient is applied, and indicates the selection information and the power coefficient.
- the CSI includes a rank indicat ion (RI)", and the information indicating the power factor may be transmitted at the same CSI reporting instance as the RI.
- RI rank indicat ion
- the CSI is a precoding matrix indicator (PMI)
- the second PMI may be subsampled and transmitted in 4 bits.
- the precoding matrix is composed of a first precoding vector for a first layer and a second precoding vector for a second layer, and the first precoding vector is a first polarization.
- the first precoding vector is a first polarization.
- the value of the phase coefficient applied to the word may be predefined.
- a value of a phase coefficient applied to the second codeword, the third codeword, the fourth codeword, the sixth codeword, the seventh codeword, and the eighth codeword is determined by the second PMI. Can be determined by.
- the value of the phase coefficient applied to the second codeword may be determined by the second PMC within ⁇ l, -l, j, -j ⁇ .
- the value of the phase coefficient applied to the third codeword may be determined by the second PMI within ⁇ l, j ⁇ .
- the value of the phase coefficient applied to the fourth codeword and the eighth codeword may be determined based on the value of the phase coefficient applied to the third codeword and the seventh codeword.
- the value of the phase coefficient applied to the seven codewords may be equal to the value of -1 multiplied by the value of the phase coefficient applied to the third codeword, respectively.
- the CSI may be transmitted through PUCCH (Physical Uplink Control Channel) format 2 / 2a / 2b.
- PUCCH Physical Uplink Control Channel
- a more precise beam may be generated by more accurately reflecting a multipath channel between a terminal and a base station in a wireless communication system supporting a multiple antenna system.
- feedback overhead of channel state information may be reduced in a wireless communication system supporting a multiple antenna system.
- channel state information may be fed back using a previously defined PUCCH format without defining a new PUCCH format.
- FIG. 1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.
- FIG. 2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.
- FIG. 3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.
- FIG. 4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.
- FIG. 5 shows an example of a form in which PUCCH formats are mapped to a PUCCH region of an uplink physical resource block in a wireless communication system to which the present invention can be applied.
- 6 shows a structure of a CQI channel in the case of a normal CP in a wireless communication system to which the present invention can be applied.
- FIG. 7 shows a structure of an ACK / NACK channel in case of a normal CP in a wireless communication system to which the present invention can be applied.
- FIG. 11 illustrates constellation mapping of ACK / NACK and SR for PUCCH format 1 / la / lb in a wireless communication system to which the present invention can be applied.
- 12 is a diagram for describing resource mapping of encoded bits according to an embodiment of the present invention.
- Figure 13 illustrates a proof read-mueller in a wireless communication system to which the present invention can be applied.
- FIG. 16 illustrates a two-dimensional antenna system having cross polarization in a wireless communication system to which the present invention can be applied.
- FIG. 17 illustrates a transceiver unit model in a wireless communication system to which the present invention can be applied.
- FIG. 18 is a diagram illustrating the configuration of a codebook in a wireless communication system to which the present invention can be applied.
- FIG. 19 illustrates second beam selection according to an embodiment of the present invention. A diagram illustrating a subsampling method for this.
- FIG. 21 is a diagram illustrating a subsampling method for second beam selection according to an embodiment of the present invention.
- a base station may be replaced by terms such as a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point (AP).
- the terminal 'terminal' may be fixed or mobile, user equipment (UE), mobile station (MS), user terminal (UT), mobile subscriber station (MSS), subscriber station (SS), AS ( Advanced Mobile Station (T), Wireless Terminal (T), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.
- Embodiments of the present invention may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802, 3GPP and 3GPP2. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents.
- all terms disclosed in the present document can be described by the above standard document. For clarity, the following description focuses on 3GPP LTE / LTE-A, but the technical features of the present invention are not limited thereto.
- FIG. 1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.
- a radio frame consists of 10 subframes.
- One subframe consists of two slots in the time domain.
- the time taken to transmit one subframe is called transmission time interval (interval ⁇ ).
- one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
- One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
- 3GPP LTE is for representing the symbol period of OFDMA # ⁇ ⁇ - ⁇ . ⁇ OFDM symbol in downlink.
- An OFDM symbol can be referred to as one SC— FDMA symbol or symbol period.
- a resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.
- FIG. 1B illustrates a frame structure type 2.
- FIG. Type 2 radio frames consist of two half frames, each of which has five subframes, downlink pilot time slot (DwPTS), guard period (GP), and uplink pilot time slot (UpPTS).
- DwPTS downlink pilot time slot
- GP guard period
- UpPTS uplink pilot time slot
- One subframe consists of two slots.
- an uplink-downlink configuration is a rule indicating whether uplink and downlink are allocated (or reserved) for all subframes.
- Table 1 shows an uplink-downlink configuration.
- 'D' denotes a subframe for downlink transmission
- 'S' represents a special subframe consisting of three fields, DwPTS, GP, and UpPTS.
- the uplink-downlink configuration can be classified into seven types, and the location and / or number of downlink subframes, special subframes, and uplink subframes are different for each configuration.
- the uplink-downlink configuration can be known to both the base station and the terminal as system information.
- the base station may notify the terminal of the change of the uplink-downlink allocation state of the radio frame by transmitting only an index of the configuration information.
- the configuration information is a kind of downlink control information and may be transmitted through PDCCH (Physical Downl Ink Control Channel) in the same manner as other scheduling information, and all terminals in a cell through broadcast channel as broadcast information. May be transmitted in common.
- Table 2 illustrates the configuration of the special subframe (length of DwPTS / GP / UpPTS).
- the structure of the radio frame is only one example, and the number of subcarriers included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may be variously changed.
- FIG. 2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.
- one downlink slot includes a plurality of OFDM symbols in the time domain.
- one downlink slot includes seven OFDM symbols, and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.
- Each element on the resource grid is a resource element, and one resource block (RB) includes 12 ⁇ 7 resource elements.
- the number of resource blocks included in the downlink slot N A DL is It depends on the downlink transmission bandwidth.
- the structure of the uplink slot may be the same as the structure of the downlink slot.
- FIG. 3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.
- Examples of the downlink control channel used in 3GPP LTE include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical Hybrid (ARQ Indicator Channel).
- PCFICH Physical Control Format Indicator Channel
- PDCCH Physical Downlink Control Channel
- ARQ Indicator Channel Physical Hybrid
- the PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols (ie, the size of the control region) used for transmission of control channels within the subframe.
- PHICH is a male answer channel for the uplink and a PHQ for a hybrid automatic repeat request (HARQ).
- HARQ hybrid automatic repeat request
- DCI downlink control information
- the downlink control information includes uplink resource allocation information, downlink resource allocation information or an uplink transmission (TX) power control command for a certain terminal group.
- the PDCCH is a resource allocation and transmission format of DL—Downlink Shared Channel (SCH) (also called a downlink grant) and UL-SCH (Uplink Shared).
- Channel resource allocation information also called uplink grant
- paging information in a paging channel (PCH) paging information in a paging channel (PCH)
- system information in a DL—SCH random access response transmitted in a PDSCH
- Resource allocation for the same upper-layer control message a set of transmission power control commands for individual terminals in an arbitrary terminal group, and activation of voice over IP (VoIP) may be carried.
- the plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.
- the PDCCH consists of a set of one or a plurality of consecutive CCEs.
- CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to the state of a radio channel.
- the CCE is referred to a plurality of resource element groups.
- the number of bits of the PDCCH and the available PDCCH is determined according to the correlation between the number of CCEs and the coding rate provided by the CCEs.
- SI-RNTI system information RNTI
- RA-R TI random access-NTI
- FIG. 4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.
- an uplink subframe may be divided into a control region and a data region in the frequency domain.
- a physical uplink control channel (PUCCH) carrying uplink control information is allocated to the control region.
- the data area is allocated PUSCH (Physical Uplink Shared Channel) ° 1 carrying ⁇ ⁇ -data.
- PUCCH Physical Uplink Control Channel
- PUSCH Physical Uplink Shared Channel
- RS can be classified into two types according to its purpose. There are RSs for obtaining channel state information (CSI) and RSs used for data demodulation. Since the former is intended for the UE to acquire the downlink CSI, it should be transmitted over a wide band and should be able to receive a UE that does not receive the downlink data in a specific subframe. In addition, the RS it is also used for such as RRM (Radio Resource Management) such as determination of handover. The latter is an RS sent together in a corresponding subframe when the base station sends downlink data, and the UE can estimate the channel and demodulate the data by receiving the RS. This RS must be transmitted in the band in which data is transmitted.
- RRM Radio Resource Management
- CSI-RS for CSI measurement for Suntec, such as Modulation and Coding Scheme (MCS), Precoding Matrix Indicator (PMI), and DM-RS for data demodulation Separated by (Demodulation—RS), two RSs were added.
- MCS Modulation and Coding Scheme
- PMI Precoding Matrix Indicator
- DM-RS data demodulation Separated by
- the CSI-RS Since the CSI-RS is not used for data demodulation, it does not need to be transmitted every subframe. Therefore, to reduce the overhead of the CS RS, it is transmitted intermittently on the time axis.
- the DM-RS is transmitted to the UE scheduled in the corresponding time-frequency domain. That is, the DM-RS of a specific UE is transmitted only in a region where the UE is scheduled, that is, a time-frequency region in which data is received.
- PUCCH Physical Uplink Control Channel
- the uplink control information (UCI) transmitted through the PUCCH may include the following scheduling request (SR), HARQ ACK / NACK information, and downlink channel measurement information.
- SR scheduling request
- HARQ ACK / NACK information HARQ ACK / NACK information
- downlink channel measurement information HARQ ACK / NACK information
- SR Service Request: Information used to request an uplink UL-SCH resource. It is transmitted using OOK (On-off Keying) method.
- the CSI may include at least one of a channel quality indicator (CQI), a rank indicator (RI), a precoding matrix indicator (PMI), and a precoding type indicator ( ⁇ ). 20 bits are used per subframe.
- CQI channel quality indicator
- RI rank indicator
- PMI precoding matrix indicator
- ⁇ precoding type indicator
- HARQ ACK / NACK information may be generated according to whether the decoding of the downlink data packet on the PDSCH is successful.
- 1 bit is transmitted as ACK / NACK information for downlink single codeword transmission
- 2 bits are transmitted as ACK / NACK information for downlink 2 codeword transmission.
- Channel measurement information refers to feedback information related to the Multiple Input Multiple Output (MIMO) technique, including channel quality indicator (CQI), precoding matrix index (PMI) and tank indicator. (RI: Rank Indicator) 1: It may be included. These channel measurement information may be collectively expressed as CQI.
- PUCCH can be modulated using Binary Phase Shift Keying (BPSK)! "Quadrature Phase Shift Keying (QPSK).
- BPSK Binary Phase Shift Keying
- QPSK Quadrature Phase Shift Keying
- Control information of a plurality of terminals can be transmitted through PUCCH, and the signals of the respective terminals can be distinguished.
- CDM code division multiplexing
- a length 12 constant amplitude zero autocorrelation (CAZAC) sequence is mainly used. Since the CAZAC source has a characteristic of maintaining a constant amplitude in the time domain and frequency domain, the coverage is reduced by reducing the Peak-Average Power Ratio (PAPR) or the Cubic Metric (CM) of the terminal. It has a suitable property to increase.
- PAPR Peak-Average Power Ratio
- CM Cubic Metric
- ACK / NACK information for downlink data transmission transmitted through the PUCCH is covered using an orthogonal sequence (OC) or an orthogon
- control information transmitted on the PUCCH can be distinguished using a cyclic shifted sequence (cyclic shift) sequence of different cyclic shift (CS) values.
- a cyclically shifted sequence can be generated by cyclically shifting a base sequence (base. Sequence) by a specific cyclic shift amount.
- the specific CS amount is indicated by the cyclic shift index (CS index).
- the number of cyclic shifts available may vary depending on the delay spread of the channel.
- Various kinds of sequences may be used as the base sequence, and the above-described CAZAC sequence is one example.
- the amount of control information that the UE can transmit in one subframe is based on the number of SC-FDMA symbols available for transmission of control information (that is, RS transmission for coherent detection of PUCCH). SC-FDMA symbols except for the SC-FDMA symbol used).
- PUCCH format 1 is used for single transmission of SRs. In the case of SR transmission alone, an unmodulated waveform is applied, which will be described later in detail.
- PUCCH format la or lb is used for transmission of HARQ ACK / NACK.
- PUCCH format la or lb may be used.
- HARQ ACK / NACK and SR may be transmitted in the same subframe using PUCCH format la or lb.
- PUCCH for 2 is used for transmission of CQI
- PUCCH format 2a or 2b is used for transmission of CQI and HARQ ACK / NACK.
- the extended CP it may be used for transmission of the PUCCH format CQI and HARQ ACK / NACK.
- PUCCH format 3 is used to carry 48 bits of encoded UCI.
- PUCCH format .3 may carry HARQ ACK / NACK for a plurality of serving cells, SR (if present), and CSI report for one serving cell.
- N_RB A UL indicates the number of resource blocks in uplink
- 0, 1, ..., N_RB A UL-1 means a number of physical resource blocks.
- the PUCCH is mapped to both edges of the uplink frequency block.
- the number of PUCCH RBs available by PUCCH format 2 / 2a / 2b (N_RB A (2)) may be indicated to terminals in a cell by broadcasting signaling.
- the reporting period of the channel measurement feedback (hereinafter, collectively referred to as CQI information) and the frequency unit (or frequency resolution) to be measured can be controlled by the base station.
- CQI reporting may be supported PUCCH format 2 may be used only for periodic reporting and PUSCH may be used for aperiodic reporting
- the base station uses a separate CQI for resources scheduled for uplink data transmission to the UE.
- the report can be sent and sent.
- 6 shows a structure of a CQI channel in the case of a normal CP in a wireless communication system to which the present invention can be applied.
- SC-FDMA symbols 0 to 6 of one slot SC-FDMA symbols 1 and 5 (second and sixth symbols) are used for demodulation reference signal (DMRS) transmission, and in the remaining SC-FD A symbols. CQI information may be transmitted. Meanwhile, in the case of an extended CP, one SC-FDMA symbol (SC-FDMA symbol 3) is used for DMRS transmission.
- SC-FDMA symbol 3 SC-FDMA symbol 3
- PUCCH format 2 / 2a / 2b modulation by a CAZAC sequence is supported, and a QPSK modulated symbol is multiplied by a length 12 CAZAC sequence.
- the cyclic shift (CS) of the sequence is changed between symbol and slot. Orthogonal covering is used for DMRS.
- DMRS Reference signal
- CQI information is carried on the remaining five SC-FDMA symbols.
- Two RSs are used in one slot to support a high speed terminal.
- each terminal is distinguished using a cyclic shift (CS) sequence.
- CS cyclic shift
- the CQI information symbols are modulated and transmitted throughout the SC-FDMA symbol, and the SC-FDMA symbol is composed of one sequence. That is, the terminal modulates and transmits CQI in each sequence.
- Ten CQI information bits are channel coded with a 1/2 rate punctured (20, k) Reed-Muller (RM) code to generate 20 coded bits 7 ⁇ . Coded bits are scrambled prior to QPSK constellation mapping (with 31 length Gold sequence) Similar to PUSH data being scrambled).
- RM Reed-Muller
- the number of symbols that can be transmitted in one TTI is 10, and modulation of CQI information is determined up to QPSK.
- QPSK mapping is used for an SC-FDMA symbol, a 2-bit CQI value may be carried, and thus a 10-bit CQI value may be loaded in one slot. Therefore, a CQI value of up to 20 bits can be loaded in one subframe.
- a frequency domain spread code is used to spread the CQI information in the frequency domain.
- a frequency-domain spread code may use a CAZAC sequence of length -12 (eg, ZC sequence).
- Each control channel may be distinguished by applying a CAZAC sequence having different cyclic shift values.
- IFFT is performed on the frequency domain spread CQI information.
- the UE may be semi-statically configured by higher layer signaling to periodically report different CQI, PMI, and RI types on the PUCCH resource "PUCCH T " PUCCH T "PUCCH) S-directed PUCCH resource. . here ,
- the PUCCH resource index (“PUCCH”) is information indicating a PUCCH region used for PUCCH 1 1 2 / 2a / 2b transmission and a cyclic shift (CS) value to be used.
- the modulated symbol is multiply multiplied by a length 12 CAZAC sequence.
- y (o),. .., ⁇ y (Nl) symbols can be called block of symbols.
- a Hadamard sequence of length 4 is used for general ACK / NACK information, and a Discrete Fourier Transform (DFT) sequence of length 3 is used for shortened ACK / NACK information and a reference signal.
- DFT Discrete Fourier Transform
- a Hadamard sequence of length 2 is used for the reference signal in the case of an extended CP. .
- FIG. 7 shows a structure of an ACK / NACK channel in case of a normal CP in a wireless communication system to which the present invention can be applied.
- a reference signal is carried on three consecutive SC-FDMA symbols in the middle of seven SC-FDMA symbol increments included in one slot, and an ACK / NACK signal is carried on the remaining four SC-FDMA symbols.
- RS may be carried on two consecutive symbols in the middle.
- the number and position of symbols used for RS may vary depending on the control channel, and the number and position of symbols used for ACK / NACK signals associated therewith may also Subject to change.
- 1 bit and 2 bit acknowledgment information may be represented by one HARQ ACK / NACK modulation symbol using BPSK and QPSK modulation techniques, respectively.
- the acknowledgment (ACK) may be encoded as '1'
- the negative acknowledgment (NACK) may be encoded as '0'.
- one BPSK / QPSK modulation symbol is transmitted on each SC-FDMA data symbol by applying a cyclic time shift of a length 12 base RS sequence prior to OFDM modulation (ie, frequency domain CDM).
- two-dimensional spreading is applied to increase the multiplexing capacity. That is, frequency domain spreading and time domain spreading are simultaneously applied to increase the number of terminals or control channels that can be multiplexed.
- Zadof f-Chu (ZC) sequence which is one of the CAZAC sequences, may be used.
- ZC sequence different cyclic shifts (CSs) are applied to a ZC sequence, which is a basic sequence, so that multiplexing of different terminals or different control channels may be applied.
- the number of CS resources supported in an SC-FDMA symbol for PUCCH RBs for HARQ ACK / NACK transmission is set by a cell-specific higher-layer signaling parameter (A_shift A PUCCH).
- the frequency domain spread ACK / NACK signal is spread in the time domain using an orthogonal spreading code.
- an orthogonal spreading code a Walsh-Hadamard sequence or a DF sequence may be used.
- ACK / NACK The signal can be spread using orthogonal sequences of length 4 (wO, wl, w2, W3) for 4 symbols.
- RS is also spread through an orthogonal sequence of length 3 or length 2. This is called orthogonal covering (OC).
- a plurality of terminals may be multiplexed using a code division multiplexing (CDM) scheme using the CS resource in the frequency domain and the OC resource in the time domain as described above. That is, ACK / NACK information and RS of a large number of terminals may be multiplexed on the same PUCCH RB.
- CDM code division multiplexing
- the number of spreading codes supported for ACK / NACK information is limited by the number of RS symbols. That is, since the number of RS transmission SC-FDMA symbols is smaller than the number of ACK / NACK information transmission SC-FDMA symbols, the RS has a smaller capacity than the multiplexing capacity of ACK / NACK information.
- ACK / NACK information may be transmitted in four symbols.
- three orthogonal spreading codes are used instead of four, which means that the number of RS transmission symbols is three. This is because only three orthogonal spreading codes can be used for the RS.
- the scheduling request is transmitted in such a way that the terminal requests or does not request to be scheduled.
- the SR channel reuses the ACK / NACK channel structure in the PUCCH format la / lb and is configured in an on-off keying (OOK) scheme based on the ACK / NACK channel design. Reference signals are not transmitted on SR channels. Accordingly, a sequence of length 7 is used for a general CP, and a sequence of length 6 is used for an extended CP. Different cyclic shifts or orthogonal covers may be assigned for SR and ACK / NACK. That is, for positive SR transmission, the UE transmits HARQ ACK / NACK through a resource allocated for SR. For negative SR transmission, the UE transmits HARQ ACK / NACK through a resource allocated for ACK / NACK.
- Simultaneous transmission of the HARQ ACK / NACK and the CQ process of the UE may be performed by UE specific higher layer signaling. If simultaneous transmission is not possible, the UE needs to transmit HARQ ACK / NACK on the PUCCH in the same subframe as the subframe in which the CQI report is configured. At this time, the CQI is dropped and only HARQ ACK / NACK is transmitted using the PUCCH format la / lb. CQI and 1 or 2- in a subframe where the ⁇ scheduler allowed simultaneous transmission of CQI and HARQ ACK / NACK from the UE. Bit ACK / NACK information needs to be multiplexed within the same PUCCH RB. As a result, it is possible to maintain low cubic metric single carrier characteristics of the signal. In the case of a normal CP and an extended CP, the way to achieve this is different.
- FIG. 8 is a diagram illustrating constellation mapping of HARQ ACK / NACK for a general CP in a wireless communication system to which the present invention can be applied.
- the ACK / NACK bit (unscrambled) is BPSK / QPSK modulated as illustrated in FIG. .
- dHARQ a single HARQ ACK / NACK modulation symbol
- the ACK is encoded as binary '1' and the NACK is encoded as binary '0'.
- a single HARQ ACK / NACK modulation symbol (dHARQ) is then used to modulate a second RS symbol (SC-FDMA symbol 5) in each CQI slot. That is, ACK / NACK is signaled using RS.
- modulation mapping results in NACK (or NACK, NACK in the case of two downlink MIMO codewords) mapped to +1, resulting in the UE failing to detect a downlink grant on the PDCCH. If it is neither an ACK nor a NACK as in the case (referred to as Discontinuous Transmission (DTX)), a basic NACK is transmitted. In other words, DTX (no RS modulation) is interpreted by the eNB as a NACK triggering downlink retransmission.
- DTX no RS modulation
- the ACK / NACK is joint encoded to generate one read-mother (RM) based block code 20 (kCQI + kA / N).
- the 20 bit codeword is transmitted on the PUCCH using the CQI channel structure of FIG.
- FIG. 10 illustrates multiplexing of SR and ACK / NACK in a wireless communication system to which the present invention can be applied.
- the UE when the SR signal and the ACK / NACK signal are generated in the same subframe, the UE transmits the ACK / NACK on the allocated SR PUCCH resource in the case of a positive SR, or a negative SR.
- ACK / NACK PUCCH 3 ⁇ 4 ⁇ transmits ACK / NACK.
- FIG. 11 illustrates constellation mapping of ACK / NACK and SR for PUCCH format 1 / la / lb in a wireless communication system to which the present invention can be applied.
- TDD time division multiplexing
- the UE can receive PDSCHs for multiple subframes, the UE can feed back HARQ ACK / NACK for the multiple PDSCHs to the eNB.
- HARQ ACK / NACK transmission for TDD There are two types:
- PUCCH format 3 is introduced to transmit up to 21 bits of UCI (A / N and SR) bits. In a situation of general CP of PUCCH format 3, 48 bits of coded bits 7 ⁇ may be transmitted.
- the UE is configured to feed back different CSI components (CQI, PMI, PTI and / or RI) semi-statically periodically by the upper layer on the PUCCH using the reporting mode defined in Table 7 below.
- CQI, PMI, PTI and / or RI CSI components
- Table 7 illustrates the CQI and PMI feedback types for the PUCCH CSI reporting mode.
- Transmission Mode 1 Mode 1-0, 2-0 Transmission Mode 2: Mode 1-0, 2-0 Transmission Mode 3: Mode 1-0, 2-0 Transmission Mode 4: Mode 1-1, 2-1 Transmission Mode 5: Mode 1-1, 2-1 Transmission Mode 6: Mode 1-1, 2-1 Transmission Mode 7: Mode 1-0, 2-0 Transmission Mode 8: If the terminal is set to transmit PMI / RI, mode 1-1, 2-1; Mode 1-0, 2-0 when the terminal is set to not report PMI / RI Mode 9: If the terminal is set to report PMI / RI and the number of CSI-RS ports exceeds 1, mode 1— 1, 2-1; If the UE is configured not to report PMI / RI and the number of CSI-RS ports is 1, modes 1-0 and 2-0 Table 8 exemplify a transmission mode. Table 8
- PBCH physical C 7 physical broadcast channels
- Non—MBSFN Non-MBSFN: on Multicast Broadcast
- Subframe If the number of PBCH antenna ports is 1, then a single antenna port, port 0 is used, otherwise transmit diversity.
- MBSFN subframe single antenna port, port 7, up to 8 layer transmission, port that 14
- the periodic CSI reporting mode for each serving cell is set by higher layer signaling.
- CSI_reporting_mode is set to sub-mode 1 or sub-mode 2 through higher layer signaling.
- CQI reporting in a particular subframe of a particular serving cell is performed using the bandwidth portion (BP (bandwidth part) or channel quality for a particular portion or portion (s) of the bandwidth of a serving seal, described as BPs BP is an index that increases in frequency in order of increasing frequency, starting at the lowest frequency.
- the system bandwidth given by N ⁇ can be divided into N subbands, where ⁇ /: "subbands have size k . If [ ⁇ 3 ⁇ 4 1- R D B L / ⁇ > 0, the size of one of the subbands is / R D B L- ⁇ V R D B L J.
- N_j depends on k J / J
- a single subband is selected. Where I 11.
- Table 9 illustrates the subband size (k), bandwidth portions ('J), and downlink system bandwidth. Table 9
- the following CQI / PMI and RI report types have separate periods and support the PUCCH CSI report mode.
- Type 1 reporting supports UE-selected subband feedback.
- Type la reporting supports subband CQI and W2 (ie, second PMI) feedback.
- Type 2b Type 2b reporting support wideband CQI and PMI feedback.
- Type 2a reporting supports wideband PMI feedback.
- Type 3 reporting supports RI feedback.
- Type 4 reporting supports wideband CQI.
- Type 6 reporting supports RI and PTI feedback.
- Type 7 reporting includes CRI (CSI-RS Resource Indicator) and . Support RI feedback.
- Type 8 reporting supports CRI, RI and wideband PMI feedback.
- Type 10 reporting supports CRI feedback.
- the period Npd (in subframes) and offset (in subframes) for CQI / PMI reporting are determined based on the parameter 'cqi-pmi-eonfiglndex- ().
- Configlndex 1 ( ⁇ ).
- Cqi -pmi -Conf iglndex 'and' ri-Configlndex 1 are both set by higher layer signaling.
- the relative reporting offset N OF J "for the RI is determined from the set ⁇ 0 ' ⁇ 1 '... '-( ⁇ —.
- the parameter' cqi -pmi -Conf iglndex 'and 1 ri-Conf iglndex' are CQI / PMI and RI, respectively Corresponding to the period and relative reporting offset for subframe set 1, 'cqi-pmi-Conf iglndex2' and 'ri -Conf iglndex2', respectively, in CQI / PMI and RI periods and subframe set 2. Corresponds to the relative reporting offset.
- the subframe through which the wideband CQI / PMI report is transmitted is defined as in Equation 1 below.
- n_f is the system frame number
- n _s denotes a slot number within a radio frame.
- the reporting interval of the RI report is an M_RI integer multiple of N pd, and a subframe in which the RI report is transmitted is defined as in Equation 2 below. [Equation 2]
- the relative offsets N_OFFSET, RI and period M_RI for RI reporting are determined by higher layer parameters. Is determined.
- the subframe through which the wideband CQI / PMI and subband CQI reports are transmitted is defined as in Equation 3 below.
- the remaining J * K report instance is added to consecutive subband CQI reports on K full cycles of BPs. Used. However, if the interval between two consecutive wideband CQI / PMI reports is less than the J * K reporting instance due to a system frame number transition to 0, then the UE will in this case have two wideband CQI / wideband PMIs. (Or Wideband CQI / Broadband Second PMI Report for Transmission Mode 9) Incremental Do not transmit the remaining subband CQI report that was not sent before. The entire cycle of each BP is increased from BP 0 to BP J-1. The parameter K is set by higher layer signaling. When the most recently transmitted PTI is 0, the wideband first PMI report has a period H ' ' N P d , and the reported subframe is defined as in Equation 5 below.
- H ′ is signaled by the higher layer.
- a system based on an active antenna can dynamically adjust the gain of the antenna element by applying an additive value to an active element (eg, an amplifier) attached (or embedded) to each antenna element. Since the radiation pattern depends on the antenna arrangement, such as the number of antenna elements, antenna spacing, etc., the antenna system can be modeled at the antenna element level.
- an active element eg, an amplifier
- M is the number of antenna elements with the same polarization in each column (ie in the vertical direction) (i.e., antenna elements with + 45 ° slope ( s i an t) in each column). Number or number of antenna elements with -45 ° slant in each column).
- N represents the number of columns in the horizontal direction (ie, the number of antenna elements in the horizontal direction).
- Antenna 4 may be mapped to a physical antenna element.
- the antenna port may be defined by a reference signal associated with a corresponding antenna port.
- Antenna Port 0 may be associated with a Cell-specific Reference Signal (CRS) and antenna port 6 may be associated with a Positioning Reference Signal (PRS).
- CRS Cell-specific Reference Signal
- PRS Positioning Reference Signal
- antenna port 0 may be mapped to one physical antenna element, while antenna port 1 may be mapped to another physical antenna element. In this case, two downlink transmissions exist from the terminal point of view. One is associated with a reference signal for antenna port 0 and the other is associated with a reference signal for antenna port 1.
- the antenna port represents downlink transmission at the terminal's point of view, not actual downlink transmission transmitted from the physical antenna element at the base station.
- MIMO precoding of the data stream may go through antenna port virtualization, transceiver unit (or transceiver unit) (TXRU) virtualization, antenna element pattern.
- TXRU transceiver unit
- M_TXRU TXRUs are associated with M antenna elements consisting of a single column antenna array with the same polarization.
- TXRU virtualization model is based on the correlation between the antenna element and the TXRU, as shown in FIG. 17 (a).
- TXRU virtualization model option 1 sub-array partition model and the TXRU as shown in FIG. 17 (b).
- Virtualization model option -2 can be divided into a full-connection model.
- antenna elements are divided into multiple antenna element groups, and each TXRU is connected to one of the groups.
- signals of multiple TXRUs are combined to form a single antenna element (or antenna element).
- Array
- mapping between the antenna port and the TXRUs may be one-to-one or one-to-many.
- the TXRU-to-element mapping shows only one example, and the present invention is not limited thereto, and TXRU and antenna elements may be implemented in various forms from a hardware point of view. The present invention can be equally applied to the mapping between them.
- the CSI-RS operation (or CSI reporting operation) of the non-precoded scheme defined as Class A (each CSI process has one CSI-RS resource and one CSI-RS operations (or CSI reporting operations) in a beamformed scheme defined as Class B (which may be associated with CSI-IM resources), and each CSI process may be associated with one or more CSI-RS resources. Or more CSI-IM resources).
- a base station can provide a UE with one CSI process. You can configure multiple CSI-RS resources in the process. In this case, the UE does not regard a CSI-RS resource set in one CSI process as an independent channel, and assumes one (huge) CSI-RS resource by aggregating corresponding resources. The UE calculates CSI from one CSI-RS resource and feeds back to the base station.
- CRI CSI-RS resource indicator
- the CRI indicates a specific CSI-RS resource, but in the future, the CRI may be further specified by indicating a specific port combination for a specific CSI-RS resource.
- the CRI may be embodied by selecting one of eight CSI-RSs in the CSI process and further selecting a combination of port 15 and 16 in the selected CSI-RS resource.
- the CRI represents 16 incremental values.
- the 3GPP Rel-13 codebook follows the dual structure of the Rel-10 and Rel-12 codebooks. That is, W_l (W1) (long-term, wideband, beam group selection) W-2 (W2) (short-term, subband, beam selection + phase matching (co the final codebook is formed from two products (ie, products of W_l and W_2).
- W A (1) represents the final form of the rank 1 codebook
- W A (2) represents the final form of the rank 2 codebook.
- N_l and N_2 are the differences in the antenna ports for each polarization in the 1st dimension and the 2nd dimension, respectively.
- m_l, tn-2 are selected from Discrete Fourier Transform (DFT) vectors in horizontal and vertical (or lst and 2nd) domains, respectively. The method is shown.
- DFT Discrete Fourier Transform
- a specific W1 i.e., first PMI 2D wide group (i.e. codebook configuration (Codebook) Config) 1 to 4) can be configured.
- subscript n indicates co-phasing.
- the 3GPP Rel-13 codebook can be considered to be a two-dimensional extension of Rel-10's 8TX (8-port transmission) codebook using a Kronecker product operation.
- the 3GPP Rel-13 codebook may form closely spaced beams.
- the 3GPP Rel-13 codebook can also be viewed as a constant modulus codebook. That is, the amplitudes of the elements constituting the vector (ie, v and u) are all 1, and only the angle is cyclically changed. it means.
- the 3GPP Rel-13 codebook corresponds to a scalable codebook using N— 1, ⁇ _2, ⁇ _1, and o_2 parameters.
- 3GPP Rel-13 codebook can be classified into four configurations (Conf ig).
- FIG. 18 is a diagram illustrating a configuration of a codebook in a wireless communication system to which the present invention can be applied.
- FIG. 18 exemplifies a category group pattern for each codebook configuration.
- a pan group pattern consisting of one pan (i.e. (X, y), where X is the first dimension (e.g., horizontal dimension> index, y is the second dimension) (Eg, vertical dimension) index), that is, there is no beamselection within W— 2 by selecting one category by W_l.
- a pan group pattern where (x, y), (X, y + 1), (x + 1, y), (x + 1, y + 1), where, Index of the first dimension (eg, horizontal dimension), y denotes the second dimension (eg, vertical dimension) index, which is the medium angle spread in both the first and second dimensions. Can be applied.
- a pan-group pattern consisting of four beams in a zigzag pattern (i.e., (X, y), (x + 1, y + 1), (x + 2, y), ( x + 3, y + 1), where x represents a first dimension (eg, horizontal dimension) index, y represents a second dimension (eg, vertical dimension) index). This is due to the large and medium angle spreads in the first and second dimensions, respectively. Can be applied.
- a pan-group pattern ie, (X, y), (x + i, y), ( ⁇ + 2, y), (x + 3, y), where x represents a first dimension (eg, horizontal dimension) index, y represents a second dimension (eg, vertical dimension) index This can be applied to large angle spreads and small angle spreads in the first and second dimensions, respectively.
- the performance difference between the four codebook configurations for the 3GPP Rel-13 codebook is small (within 5%).
- the 3GPP Rel-13 codebook does not satisfy nested properties between tanks. That is, tank 1 and rank 2 have different beam patterns.
- the applicable codebooks for one dimension in the 3GPP Rel-13 codebook are Config 1 and Config 4.
- CSI Feedback Method for Linear Combination (LC) Codebook With the introduction of FD-MIMO, the base station has N (N >> 1, e.g., 8, 12, 16, 20, 24, 28, 32) antenna ports. (Or, "element” may correspond to a specific port-to-element virtualization, which will be collectively described as "port” for convenience of description. By performing 3D-bumping and so on, the throughput of the system can be increased.
- LTE-A Long Term Evolution
- SU-MIMO Single User MI O
- the codebook is composed of only the number of antenna ports and an oversampling factor, the resolution is insufficient.
- the DFT matrix has a disadvantage in that it is difficult to accurately reflect the channel information because all three groups are 1.
- LC linear combination
- a wideband / longterm character group is set to W1 (or (ie, the first PMI)), and W2 (or W 2 ) (that is, In other words, when a subband / shortterm report of the second PMI is used, the term refers to a codebook that extends the unit / granularity of the beam by linearly combining the elements constituting W1.
- W1 is a W1 of a dual-stage codebook represented by a Class A codebook, or W1 black newly designed for linear combination is a single stage legacy codebook (e.g., 3GPP Rel-8 4Tx) can be used as W1.
- a single stage legacy codebook e.g., 3GPP Rel-8 4Tx
- Equation 10 The LC codebook is represented by an equation and is represented by Equation 10. [Equation 10]
- a t ⁇ c (k c ⁇ p (jd ik ) b,, c ik (0 ⁇ c lk ⁇ 1) is an amplitude coefficient
- N is a number of beams in W
- ⁇ is a phase coefficient
- b e ⁇ (m i , m 2 )
- w bath ⁇ is an DFT vector from W,.
- Ci k (0 ⁇ c_i, k ⁇ l) is an amplitude coefficient
- N is the number of beams within
- v ml i u m2 is The DFT vector belongs. Means Kronecker product.
- components to be reported by the terminal at W2 may include the following. i) the indices involved in selecting the best L ranges used for LC operation in the N amplifications of W1, ii) the indices related to the coefficients of the LC (e.g., phase, amplitude or phase + amplitude). iii) an index associated with a co-phase component of a cross polarization (X-pol) antenna, and the like.
- X-pol cross polarization
- a beam may be interpreted as a precoding matrix (or a precoding vector or a codeword) for generating a corresponding beam, and a group of groups is a set of precoding matrices. (Or a set of precoding vectors).
- Table 25 is a table illustrating the number of codewords of the LC codebook.
- N number of beams in W1
- P number of phase coefficients
- A number of amplitude coefficients
- LC is performed on the basis of its beam as a reference. That is, according to Equation 10, any category belonging to the W1 group can be selected for LC, but according to Equation 11, a specific category belonging to the W1 beam group is selected for the LC in the remaining beam increments in a predetermined situation. Can be. Therefore, the LC can be applied without large performance loss compared to applying the entire LC codebook size (that is, the case of Equation 10 above). Equation 10 or Equation 11 (that is, Equation 10 in Equation 10) can be applied.
- LC codebook Whether the LC codebook is configured using the scheme applied to 11) may be set to the UE by higher layer signaling (e.g., RRC signaling), and the base station and the UE may be configured in advance. I can promise you.
- RRC signaling e.g., RRC signaling
- the CSI feedback method on the PUCCH format 2 / 2a / 2b will be described.
- CSI periodic CSI
- CS Engineering feedback is supported as follows.
- One full report includes three reporting time points / instances on PUCCH format 2 / 2a / 2b.
- the UE may report the RI to the base station in the first instance, report the W1 to the base station in the second instance, and report the CQI and W2 to the base station in the third instance.
- 3GPP Rel .13 Class A Codebook (ie, Tables 7.2.4- 10, 7.2.4-11, 7.2.4-12, 7.2.4-13, 7.2.4-14, 7.2 of 3GPP TS 36.213 vl3.6.0). 4-15, 7.2.4-16, or 7.2.4-17) is assumed.
- the W1 feedback periodicity is ⁇ '* N pd .
- the maximum bit width of W1 is 9 bits for rank 1-2 when using Configl.
- the maximum oversampling factor is (8,4>), so that the bit length can be up to 9 bits.
- the LC codebook in submode 1 of P-CSI mode 1-1 may be as follows.
- i2 may be defined as follows for convenience of description of the present invention.
- selection information for indicating a category (i.e., codeword) used in the LC to generate a precoding matrix according to an embodiment of the present invention, i.e.
- Information for indicating the applied LC coefficient e.g., power coefficient, information for indicating the phase coefficient
- transmitted at each polarization i.e. domain
- cross polarization antenna layout Information for indicating phase matching for co-phase of the beam may be distinguished.
- phase coincidence with phase coefficient described as an example of LC coefficient (Co- phse) may be indicated as one phase coefficient.
- Submode 1 of P-CSI mode 1-1 proposed in the present invention may be considered as follows.
- Proposal A.1 One full report includes three reporting time points / instances on PUCCH format 2 / 2a / 2b.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance may be an integer multiple of the period of the third instance.
- LC codebooks of different units / granularities may be used for each rank (Rank 1 or 2).
- the UE may be configured to report a PMI (i22 + i23) corresponding to 7 bits.
- PMI i22 + i23
- i22 for both Phase and Amplitude
- Rank 2 consider an LC codebook that only considers i22 for Phase (or phase and subsample amplitude). . This is equally Rank
- rank 1 may use i22 considering feedback of only one of Equation 10 and Phase or Amplitude
- rank 22 may use i22 considering feedback of only one of Equation 11 and Phase or Amplitude.
- joint encoding with W1 in the second instance The component of W2 encoded) is i23 ° l
- W2 jointly encoded with CQI in the second instance may be composed of i21 and i22, which is the same as Proposed A.1-1).
- the UE reports RI to the base station in the first instance, reports W1 and W2 (i23) to the base station in the second instance, and reports CQI and W2 (i21 + i22) to the base station in the b instance. Can be.
- the modified proposal is the same as proposal A.1-2) and proposal A.1-3) below.
- the current LTE codebook for the X-pol antenna structure reports co-phase information (ie, change of phase component). This means that the channel difference from the horizontal slant (H-slant) and vertical slant (V-slant) antennas means that the phase component difference is dominant. Therefore, the LC codebook also reflects this, and the amplitude can be reported in a period longer than the phase. This feedback method can reduce the feedback overhead.
- Proposal A.1-2 One full report includes three reporting time points / instances on PUCCH format 2 / 2a / 2b.
- the UE reports RI to the base station in the first instance, reports W1 and W2 (i221 + i21) to the base station in the second instance, and reports CQI and W2 (i222 + i23) to the base station in the third instance. Can be.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance may be an integer multiple of the period of the third instance.
- Proposal A.1-3 One full report includes three reporting time points / instances on PUCCH format 2 / 2a / 2b.
- the UE reports the RI to the base station in the first instance, reports W1 and W2 (i221) to the base station in the second instance, and reports the CQI and W2 (i21 + i222 + i23) to the base station in the third instance. You can report it.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance may be an integer multiple of the period of the third instance.
- Submode 1 of P-CSI mode 1-1 proposed in the present invention may be considered as follows.
- One full report includes four reporting time points / instances on PUCCH format 2 / 2a / 2b.
- the UE reports the R ⁇ to the base station in the first instance, reports the W1 to the base station in the second instance, reports the W2 (i21 + i22) # base station in the third instance, and the CQI and W2 in the fourth instance. (i23) may be reported to the base station.
- the LC may be configured in consideration of phase and amplitude (or only phase).
- the components of i22 may be divided into amplitude and phase components and transmitted to different instances.
- ampli ude coefficient ⁇ i221 and the phase coefficient are i222.
- Proposal A.2-1 One full report includes four reporting time points / instances on PUCCH format 2 / 2a / 2b.
- P-CSI mode 2-1 supports CSI feedback as follows.
- Proposal A.3 One full report includes three reporting time points / instances on PUCCH format 2 / 2a / 2b.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance may be an integer multiple of the period of the third instance.
- the LC may be configured in consideration of phase and amplitude (or only phase).
- the proposed method has an LC coefficient
- the components of i22 may be divided into amplitude and phase components and transmitted to different instances.
- the amplitude coefficient is i221 and the phase coefficient is i222.
- Proposal A.3-2 One full report includes three reporting time points / instances on PUCCH format 2 / 2a / 2b.
- the UE may report the RI and the PTI to the base station in the first instance.
- the UE may report W1 and W2 (i21 + i221) to the base station in the 12 instances, and report the CQI and W2 ( ⁇ 222 + i23) to the base station in the third instance. .
- the UE may report the RI and the PTI to the base station in the first instance.
- ⁇ 1
- the UE reports 1 to the WB CQI and 2 (i21 + 1221) - ⁇ base station in the second instance, and reports the SB CQI, W2 (i222 + i23) and L 'in the third instance. You can report it to.
- Proposal A.3-3 One full report includes three reporting time points / instances on PUCCH format 2 / 2a / 2b.
- the UE may report the RI and the PTI to the base station in the first instance.
- ⁇ 1
- the UE reports WB CQI and W2 (i222 + i23) 1-base station in the second instance ⁇ , and SB CQI, W2 (i222 + i23) and L 'in the third instance. Report to the base station.
- PUCCH format 3 having a capacity of up to 22 bits may be used for this purpose.
- the total length of V includes three reporting time points / instances on PUCCH format 3.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance may be an integer multiple of the period of the third instance.
- W2 of the third instance may include all the information of i2l + i22 + i23 described above, and considering both phase and amplitude, the maximum W2 index is 18 bits. In this case, since the CQI may be 7 bits, the payload size of 22 bits is exceeded. To avoid this, LC codebooks that promise between base stations and UEs in advance, or consider phase only (or amplitude only), are used to calculate E (i.e., apply Equation 11 to Equation 10 ) when calculating i22. Can be.
- a more flexible feedback operation is performed by adding an index indicating the magnitude of the coefficient applied to the LC (eg, i24). It may be.
- phase can be applied equally.
- i22 may be promised in advance between the base station and the UE so as to subsample by rank.
- an LC codebook that considers only i22 as a phase (or phase and subsample amplitude) for Rank 2 may be used, whereas i22 may be considered as both Phase and Amplitude for Rank 1.
- Proposal A.4 Considering the method of dividing i22 component into amplitude and phase components and transmitting them to different instances, Proposal A.4) can be modified as follows.
- Proposal A.4-1 In case of P-CSI mode 1-1 submode 1, one full report includes three reporting time points / instances on PUCCH format 3. -First instance: RI
- the UE reports the RI to the base station 1 in the h instance, reports the W1 and W2 (i21 + i221) to the base station in the second instance, and reports the CQI and W2 (i222 + i23) to the base station in the third instance. You can report it.
- the UE may report the RI to the base station in the first instance, and report the CQI, W1, and W2 (i21 + i22 + i23) to the base station in the second instance.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance is the third It can be an integer multiple of the period of the instance.
- ⁇ 0, it is obvious that it can operate similarly to the scheme of A.4). That is, in addition to the fact that the RI and the PTI are fed back to the first instance, the method described in the proposal A.4) may be applied in the same manner. For example, when calculating i22, an LC codebook that promises between base station and UE in advance to use Equation 11 (ie, applies Equation 11 to Equation 10) or considers only phase (or amplitude only) is used. In addition, a more flexible feedback operation may be performed by adding an index indicating the magnitude of the coefficient applied to the LC (eg, i24).
- Equation 11 the method described in the above proposal A.4 may be applied to W2 in the same manner.
- an LC codebook that promises between base station and UE in advance to use Equation 11 i.e., applies Equation 11 to Equation 10) or considers only phase (or amplitude only) is used.
- i2 represents the i2 index (a 4-bit index consisting only of beam selector and co-phase) of the Class A codebook on which the LC codebook is based.
- the above example is characterized in that the WB and SB have codebooks of different units / granularity.
- the UE is configured / applied as described above, thereby reducing the complexity of WB reporting.
- the proposals A.3-1), A.3-2), and A.3-3) proposed in PUCCH format 2 may also be applied to PUCCH format 3.
- the LC may be configured in consideration of the phase and amplitude (or only phase).
- the components of i22 may be divided into amplitude and phase components and transmitted to different instances.
- the use of PTI can also be used to indicate amplitude coefficients and phase coefficients.
- the terminal configured / applied by the LC codebook may be configured / applied to be used only by the PUCCH format 3.
- PUCCH format 3 is used by the UE for ACK / NACK feedback for DL data.
- the payload size of the ACK / NAK is determined by the number of component carriers (CC) and the number of codewords that are carrier merged (CA).
- the base station may distinguish and set the PUCCH format 1 3 3 for ACK / NAK transmission and the PUCCH format 3 for CSI transmission to the UE.
- the UE may simultaneously transmit corresponding information using two PUCCH formats 3. If the ACK / NAK payload (SR) in the full 22-bit capacity of PUCCH format 3 ACK / NAK and CSI may be simultaneously transmitted through PUCCH format 3 when the free capacity of PUCCH format 3, excluding the information, is calculated by adding up to 1 bit of payload size of SR information). If not, CSI is not transmitted (ie, CSI is dropped) and only ACK / NAK can be transmitted.
- SR ACK / NAK payload
- the present invention proposes various subsampling techniques of the W1 codebook constituting the LC codebook.
- a group of up to eight uniformly spaced orthogonal beams is selected. Then select two categories within the group.
- the beams are combined in W2 using QPSK and encoded independently layer by layer.
- Equation 12 The LC codebook is represented by Equation 12 below. [Equation 12]
- N 1 and N 2 are the number of antenna ports in the first and second dimensions, respectively.
- 0 2 are over sampling factors in the first and second dimensions, respectively.
- Second beam power is quantized to 2 bits. iii) W2
- W1 needs 13 bits irrespective of rank
- the present invention proposes such a Wl codebook subsampling descriptor.
- One full report includes three reporting time points / instances on PUCCH format 2 / 2a / 2b.
- the UE may report the RI to the base station in the first instance, report the W1 to the base station in the second instance, and report the CQ Engineering and W2 to the base station in the third instance.
- the payload size corresponding to the leading beam index corresponds to ogz ⁇ Nz ⁇ Ozl.
- it has a value of 8 bits which is the maximum value in the 2D 32-port layout.
- Table 27 is a method illustrating subsampling of an X-port (ie cross polarization) antenna.
- the present proposal sets / applies different oversampling values according to the value of X, which is the number of ports that the UE supports LC codebook. It is characterized by performing subsampling.
- Table 28 illustrates the combination of (,, combinations for the subsampling of LC codebooks with 2 ⁇ [ ⁇ 1 2 > 12 ⁇ .
- the proposal 2 proposes a method of selecting a second beam (a beam floating on an index having a superscript of Equation 13 below). That is, a 1-bit second beam selection technique is proposed by subsamples the payload of the second beam selection.
- FIG. 19 is a diagram illustrating a subsampling method for second beam selection according to an embodiment of the present invention.
- the payload size of the pan selection can be subsampled into 2 bits.
- various subsampling schemes are proposed as shown in FIGS. 19 (b) to 19 (e).
- the second beam selection is reduced to flog 2 bits.
- the orthogonal basis may be characterized by only this particular domain.
- the proposed scheme 2-3 is illustrated in FIG. 9 (d) and Table 31 below.
- 20 is a diagram illustrating a subsampling method for second beam selection according to an embodiment of the present invention.
- FIG. 21 is a diagram illustrating a subsampling method for second beam selection according to an embodiment of the present invention.
- Table 33 illustrates the (d 1 ( d 2 )) combination for subsampling of LC codebooks> 16.
- bit size for the second beam selection is determined by [log 2 NjNzOxOz + log 2 ( ⁇ )
- [log 2 10 * 4 * 4 * ( ⁇ )
- Can be subsampled into 9 bits.
- Table 34 lists the number of second beam candidates required when performing subsampling on second beam selecti! In a 2D port layout requiring subsampling as described above, and is independent of joint encoding of leading beam selection and second beam selection. This value considers the case of encoding with.
- the example of the second beam candidates corresponding to each number may include the example of FIGS. 19 to 21 described above.
- which value / pattern second beam candidates are to be used for subsampling purposes may be configured for the UE by higher layer signaling (eg, RRC and / or MAC CE).
- Table 34 illustrates the maximum number of second beam candidates for the 2D X-port layout.
- the second beam power is set to 1 to apply zero bit payload.
- the UE may be configured with higher layer signaling (eg, RRC and / or MAC CE) to determine what value of pi or pi combination to use for subsampling purposes.
- the maximum number of second beam candidates may include examples of proposals 2-1, 2-2, 2-3, and 2-4 described above.
- Table 36 is a table illustrating subsampling for 2N ⁇ 2 > 16.
- proposal 4-4 all or two elements of the leading beam index, the second beam selection, and the power coefficient are jointly encoded. Examples of proposal 4-4 are summarized in Table 38 below.
- the beam patterns of FIGS. 22 and 20 may be considered, respectively.
- modified P-CSI mode 1-1 submode 1 for LC is as follows.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance may be an integer multiple of the period of the third instance.
- W21 and W22 may have payloads of 6 bits in the same manner as in the LC codebook configuration.
- RI is 3 bits
- W11 can have an 8 bit payload.
- Equation 14 the final rank 2 codebook may be determined as in Equation 14 below.
- the load size is 4 bits.
- the precoding matrix is a first precoding vector for the first layer (that is, [r b oJh D + i ⁇ C 0,0 *, l * b * D * Pi 2 h ⁇ 2J) and the second pre-coding for second layer Can be constructed
- the first precoding vector is a linearly coupled vector of the first codeword (ie, []) and the second codeword (ie, [co * Pl * b 2 ]) for the first polarization (ie, [l] + c 0 , i * Pl * b 2 ]) and the third codeword for the second polarization (that is, [, ⁇ * ⁇ ] ⁇ and the fourth codeword (that is, [, 0 * * Pl * b 2 ]) linearly coupled vector (ie + ⁇ , ⁇ ,! *
- the second precoding vector is a linearly coupled vector (i.e., [a * co * Pl * b 2 ]) of the fifth codeword (i.e. + a * Co * Pl * b 2 ]> and the seventh codeword (ie ["C o * ⁇ ]) and the eighth codeword (ie [" C o * a * * Pl *) for the second polarization b 2 ]) linearly coupled vectors (ie, [ ⁇ .oo * C * ⁇ * ⁇ )]).
- a codeword corresponding to a leading beam in a precoding vector ie, a first precoding vector and a second precoding vector
- a first codeword ([b) and a fifth code ie, a first codeword ([b) and a fifth code
- the phase coefficient applied to the word ([]) may be defined as 1 in advance.
- a codeword corresponding to one of the second beams in the precoding vector (ie, the first precoding vector and / or the second precoding vector) for each layer e.g., g., the second code word ([c (u * Pl * b 2])) phase coefficients (i. e., 2 bits (e. g., QPSK alphabet (i.e., 1, j, -1, applied to the - j) That is, the values of the phase coefficients applied to the codewords corresponding to one beam of the second beam increment in the precoding vector for each layer are ⁇ l, -l, j,- j ⁇ may be determined by the second PMI.
- a codeword (eg, a third code) that complements the two beams of the second beam in the precoding vector (ie, the first precoding vector and / or the second precoding vector) for each layer.
- the phase coefficients (ie c li0 , 0 and a) applied to the word ([oo * ⁇ ]) and the sixth codeword ([a * Coo i * Pl * b 2 ] ) are each one bit (eg , ⁇ L, j ⁇ respectively. That is, the phase coefficient applied to the codewords corresponding to two beams of the second beam in the precoding vector for each layer is It can be determined by the second PMI within two elements (eg ⁇ l, j ⁇ ).
- phase coefficient applied to the codeword corresponding to any one of the second beams excluding the leading beam is 2 bits of W2 (e.g., QPSK alphabet (i.e., 1, j , -1, -j)).
- the phase coefficients applied to the codewords commingling the two beams in the second beam increment may be indicated by 1 bit of W2, respectively.
- the phase coefficient applied to the codeword corresponding to the other remaining second beam is
- the value of the phase coefficient ( 0,0 *) applied to the fourth codeword may be determined based on the value of the phase coefficient (, 0,0 ) applied to the third codeword. have.
- the value of the phase coefficient ( ⁇ Cl, 0,0 * a *) applied to the eighth codeword may be determined based on the value ( ⁇ , ⁇ ) of the phase coefficient applied to the seventh codeword.
- the values of the phase coefficients applied to the fourth and eighth codewords are the values of the phase coefficients applied to the third and seventh codewords and the values determined by the second p M] I , respectively. Can be determined by the product.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second i nstance may be an integer multiple of the period of low 3 instances.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of low 1 2 instances may be an integer multiple of the period of nearly b instances.
- the UE reports the RI to the base station in the first instance, reports the W1 to the base station in the second instance, reports the W2 (or CQI) to the base station in the third instance, and the CQI (or W2) in the fourth instance. Can be reported to the base station.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance may be an integer multiple of the period of the third instance.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance may be an integer multiple of the period of the third instance.
- the period of each upper instance may be an integer multiple of the period of the immediately lower instance.
- the period of the second instance may be an integer multiple of the period of the third instance.
- each can be classified into a leading beam selection subsampling, a second beam selection subsampling, and a power coefficient subsampling.
- the use of 2 bits to reduce is shown in Table 40 below.
- the terminal receives a channel state information reference signal (CSI-RS) from a base station through a multiplex antenna port (S2101).
- CSI-RS channel state information reference signal
- the terminal may generate (calculate) channel state information based on the CSI-RS received from the base station and report the channel state information to the base station.
- the channel state information may include CQI, PMI, RI, PTI, CRI, and the like.
- CSI may be reported aperiodically to the base station (eg, on the PUSCH).
- the terminal may select its most preferred precoding matrix in a linear combination codebook (LC codebook) and report information for indicating this to the base station.
- LC codebook linear combination codebook
- the precoding matrix may be generated based on a linear combination of a plurality of codewords.
- LC codebook Linear Combination Codebook
- the plurality of codewords to which the power coefficient and the phase coefficient are applied may be linearly combined.
- the CSI may include selection information indicating a plurality of codewords used to generate the precoding matrix, information indicating a power coefficient and / or information indicating a phase coef icient>. Such information may be reported to the base station at different CSI reporting time points / instances.
- the information indicating the power coefficient is sent in the same first CSI reporting instance as the RI and is selected.
- Information may be included in W1 and transmitted in the second CSI reporting instance, and information indicating a phase coefficient may be included in W2 and transmitted in the third CSI reporting instance.
- the value of the phase coefficient (for example, 1) applied to the first codeword and the fifth codeword may be predefined.
- only values of phase coefficients applied to the second codeword, the third codeword, the fourth codeword, the sixth codeword, the seventh codeword, and the eighth codeword may be determined by the second PM.
- the value of the phase coefficient applied to the second codeword and the sixth codeword is 1, j, -j ⁇ can be determined by the second PMI,
- the terminal 2420 includes a processor 2421, a memory 2422>, and an RF unit 2423.
- the processor 2421 implements the functions, processes, and / or methods proposed in Figs. The tradeoffs of the interface protocol may be implemented by the processor 2421.
- the memory 2422 is connected to the processor 2421 and stores various information for driving the processor 2421.
- the RF unit 2423 is a processor And connected to 2421 to transmit and / or receive wireless signals.
- the memories 2412 and 2422 may be internal or external to the processors 2411 and 2421 and may be connected to the processors 2411 and 2421 by a variety of well known means, and also the base station 2410 and / or the terminal 2420. May have a single antenna or multiple antennas.
- Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
- an embodiment of the invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.
- ASICs application specific integrated circuits
- DSPs digital signal processors
- DSPDs digital signal processing devices
- PLDs programmable logic devices
- FPGAs field programmable gate arrays
- processors controllers, microcontrollers, microprocessors, and the like.
- one embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above.
- the software code may be stored in memory and driven by the processor.
- the memory may be located inside or outside the processor, and may exchange data with the processor by various known means.
Abstract
Description
Claims
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EP21193347.8A EP3955473A1 (en) | 2016-09-26 | 2017-09-26 | Method for transmitting and receiving channel state information in wireless communication system and apparatus for the same |
JP2019516522A JP2019537300A (ja) | 2016-09-26 | 2017-09-26 | 無線通信システムにおけるチャネル状態情報送受信方法及びこのための装置 |
US16/065,085 US11088732B2 (en) | 2016-09-26 | 2017-09-26 | Method for transmitting/receiving channel state information in wireless communication system and apparatus for same |
CN201780047865.5A CN109565323B (zh) | 2016-09-26 | 2017-09-26 | 在无线通信系统中发送/接收信道状态信息的方法及其装置 |
EP17853500.1A EP3477874A4 (en) | 2016-09-26 | 2017-09-26 | METHOD FOR TRANSMITTING / RECEIVING CHANNEL STATUS INFORMATION IN A WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR |
KR1020187019889A KR102015650B1 (ko) | 2016-09-26 | 2017-09-26 | 무선 통신 시스템에서 채널 상태 정보 송수신 방법 및 이를 위한 장치 |
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EP (2) | EP3477874A4 (ko) |
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US20190007106A1 (en) | 2019-01-03 |
CN109565323A (zh) | 2019-04-02 |
EP3955473A1 (en) | 2022-02-16 |
KR102015650B1 (ko) | 2019-10-21 |
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US11088732B2 (en) | 2021-08-10 |
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