Terminal and wireless communication method

Abstract

The terminal disclosed in the present invention comprises: a receiving unit for receiving setting information related to a channel state information (CSI) report; and a control unit for controlling the transmission of information related to a broadband, at least one of information related to a delay and information related to a coefficient corresponding to the delay, based on the setting information. Thus, it is possible to suppress the increase of UL overhead while preventing the degradation of the CSI reporting accuracy.

Description

Technical Field

[0001] The present disclosure relates to a terminal and a wireless communication method in a next generation mobile communication system. Background Art

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP)).

[0003] Successor systems of LTE (for example, also referred to as fifth-generation mobile communication system (5G), 5G+(plus), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In Rel.15 NR, the frequency granularity for reporting Channel State Information (CSI) supports wideband and subband.

[0009] Here, the broadband is the entire band that is the target of CSI reporting, such as a certain carrier (also called component carrier (CC), cell, serving cell, etc.). A subband is a part of a broadband, such as one or more physical resource blocks (PRBs) (resource blocks (RBs)). The size of the subband (subband size, such as the number of PRBs) can also be determined according to the size of the broadband (broadband size, such as the number of PRBs).

[0010] In future wireless communication systems (for example, NR after Rel.16), it is also envisioned that at least one of a bandwidth wider than Rel.15 NR and a frequency band higher than Rel.15 NR (for example, a frequency band higher than 52.6 GHz) can be used.

[0011] However, in future wireless communication systems, if the bandwidth to be reported by CSI is widened, the subband size that depends on the bandwidth size will become larger than the coherence bandwidth, resulting in a concern that the accuracy of CSI reporting will deteriorate. On the other hand, if the subband size is to be made sufficiently smaller than the coherence bandwidth in the widened bandwidth, there is a concern that the uplink (UL) overhead will increase.

[0012] Therefore, one of the objects of the present disclosure is to provide a terminal and a wireless communication method that can prevent degradation in the accuracy of CSI reporting while suppressing an increase in UL overhead.

[0013] Solutions to Solve Problems

[0014] A terminal of one embodiment of the present invention is characterized in that it comprises: a receiving unit that receives setting information related to a channel state information (CSI) report; and a control unit that controls the sending of broadband-related information, including at least one of information related to a delay and information related to a coefficient corresponding to the delay, based on the setting information.

[0015] Effects of the Invention

[0016] According to one aspect of the present disclosure, it is possible to prevent degradation in CSI reporting accuracy while suppressing an increase in UL overhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram showing an example of the operation of the CSI report according to the first method.

[0018] Figure 2A and 2B is a diagram showing an example of feedback of broadband information according to the first embodiment.

[0019] Figure 3 This is a diagram showing an example of a precoder based on broadband information according to the first embodiment.

[0020] Figure 4 This is a diagram showing another example of a precoder based on broadband information according to the first embodiment.

[0021] Figure 5 This is a diagram showing still another example of a precoder based on the broadband information according to the first embodiment.

[0022] Figure 6 1 is a diagram showing an example of delay τ and coefficient g in a plurality of delay region precoders having different values ​​of the total number Q of delays.

[0023] Figures 7A to 7C 2 is a diagram showing an example of the first and second wideband feedback types according to the second aspect.

[0024] Figure 8 2 is a diagram showing an example of the first and second wideband feedback types according to the second aspect.

[0025] Fig. 9A and 9B is a diagram showing an example of a second wideband feedback type according to the second aspect.

[0026] Fig. 10A 10B is a diagram showing another example of the incremental feedback of the second embodiment.

[0027] Fig.11 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0028] Fig.12 This is a diagram showing an example of the structure of a base station involved in one embodiment.

[0029] Fig.13 This is a diagram showing an example of the structure of a user terminal involved in one embodiment.

[0030] Fig.14 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION

[0031] (CSI report or reporting)

[0032] In Rel.15 NR, a terminal (user terminal, also called User Equipment (UE), etc.) generates (also called determines, calculates, estimates, measures, etc.) channel state information (CSI) based on a reference signal (RS) (or resources used for the RS), and sends (also called reports, feedback, etc.) the generated CSI to a base station. The CSI can also be sent to the base station using, for example, an uplink control channel (e.g., a physical uplink control channel (PUCCH)) or an uplink shared channel (e.g., a physical uplink shared channel (PUSCH)).

[0033] The RS used in the generation of CSI may be, for example, at least one of the Channel State Information Reference Signal (CSI-RS), the Synchronization Signal / Physical Broadcast Channel (SS / PBCH) block, the Synchronization Signal (SS), the DeModulation Reference Signal (DMRS), etc.

[0034] CSI-RS may also include at least one of non-zero power (NZP) CSI-RS and CSI-Interference Management (CSI-IM). SS / PBCH block is a block including SS and PBCH (and corresponding DMRS), which may also be called SS block (SSB), etc. In addition, SS may also include at least one of primary synchronization signal (PSS) and secondary synchronization signal (SSS).

[0035] CSI may also include: a channel quality identifier (Channel Quality Indicator (CQI)), a precoding matrix identifier (Precoding Matrix Indicator (PMI)), a CSI-RS resource identifier (CSI-RS Resource Indicator (CRI)), a SS / PBCH block resource identifier (SS / PBCH Block Resource Indicator (SSBRI)), a layer identifier (Layer Indicator (LI)), a rank identifier (Rank Indicator (RI)), L1-RSRP (Layer 1 Reference Signal Received Power)), L1-RSRQ (Reference Signal Received Quality)), L1-SINR (Signal to Interference plus Noise Ratio)), L1-SNR (Signal to Noise Ratio) and the like at least one parameter (CSI parameter).

[0036] The UE may also receive information related to CSI reporting (report configuration information) and control CSI reporting based on the report configuration information. The report configuration information may also be, for example, 'CSI-ReportConfig' of the information element (IE) of the Radio Resource Control (RRC) (Radio Resource Control (RRC)). In addition, in the present disclosure, RRC IE may also be interpreted as RRC parameters, high-layer parameters, etc.

[0037] The report configuration information (eg, 'CSI-ReportConfig' of RRC IE) may include, for example, at least one of the following.

[0038] Information related to the type of CSI report (report type information, e.g., 'reportConfigType' of RRC IE)

[0039] Information on one or more quantities of CSI to be reported (one or more CSI parameters) (report quantity information, for example, 'reportQuantity' of RRC IE)

[0040] Information on RS resources used in generating the quantity (the CSI parameter) (resource information, for example, 'CSI-ResourceConfigId' of RRC IE)

[0041] Information on the frequency domain to be reported by the CSI (frequency domain information, for example, 'reportFreqConfiguration' of RRC IE)

[0042] For example, the report type information may also indicate a periodic CSI (P-CSI) report, an aperiodic CSI (A-CSI) report, or a semi-persistent CSI report (Semi-Persistent CSI (SP-CSI) report).

[0043] In addition, the report amount information may specify at least one combination of the above-mentioned CSI parameters (for example, CRI, RI, PMI, CQI, LI, L1-RSRP, etc.).

[0044] In addition, the resource information may be an ID of a RS resource. The RS resource may include, for example, a non-zero-power CSI-RS resource or an SSB or CSI-IM resource (for example, a zero-power CSI-RS resource).

[0045] In addition, the frequency domain information can also indicate the frequency granularity of the CSI report. The frequency granularity may also include, for example, a broadband and a subband. The broadband is the entire CSI reporting band (entire CSI reporting band). The broadband may be, for example, the entirety of a certain (certain) carrier (component carrier (CC), cell, serving cell), or the entirety of a bandwidth part (Bandwidth part (BWP)) within a certain carrier. The broadband may also be interpreted as a CSI reporting band, the entirety of a CSI reporting band, etc.

[0046] In addition, a subband is a part of a wideband and may be composed of one or more resource blocks (Resource Block (RB)) (Physical Resource Block (PRB)). The size of a subband may also be determined according to the size of a BWP (the number of PRBs).

[0047] The frequency domain information may also indicate which wideband or subband PMI is reported (the frequency domain information may also be included in the 'pmi-FormatIndicator' of the RRC IE used in the determination of either wideband PMI reporting or subband PMI reporting, for example). The UE may also determine the frequency granularity of the CSI report (i.e., either wideband PMI reporting or subband PMI reporting) based on at least one of the above-mentioned reporting amount information and the frequency domain information.

[0048] When wideband PMI reporting is configured (determined), one wideband PMI may also be reported for the entire CSI reporting band. On the other hand, when subband PMI reporting is configured, a single wideband indication i1 is reported for the entire CSI reporting band, and a subband indication i2 (e.g., a subband indication for each subband) may be reported for each of more than one subbands within the entire CSI report.

[0049] The UE uses the RS to perform channel estimation and estimates the channel matrix H. The UE feeds back an index (PMI) determined based on the estimated channel matrix.

[0050] The PMI may also represent a precoding matrix (also referred to as a precoder) that the UE considers suitable for downlink (downlink (DL)) transmission to the UE. Each value of the PMI may also correspond to a precoding matrix. A set of PMI values ​​may also correspond to a set of different precoding matrices called a precoder codebook (also referred to as a codebook).

[0051] In the space domain, the CSI report may also include more than one type of CSI. For example, the CSI may also include at least one of a first type (type 1 CSI, type ICSI) for single beam selection and a second type (type 2 CSI, type I ICSI) for multi-beam selection. A single beam may also be interpreted as a single layer, and multi-beams may also be interpreted as multiple beams. In addition, type 1 CSI may not assume multi-user MIMO, and type 2 CSI may assume multi-user MIMO.

[0052] The above codebook may also include a codebook for type 1 CSI (also referred to as type 1 codebook, type I codebook, etc.) and a codebook for type 2 CSI (also referred to as type 2 codebook, type II codebook, etc.). In addition, type 1 CSI may also include type 1 single-panel CSI and type 1 multi-panel CSI, and different codebooks may be specified (type 1 (I) single-panel codebook, type 1 (I) multi-panel codebook).

[0053] The frequency granularity of CSI reporting as described above depends on the uplink (uplink (UL)) overhead. For example, a specific PUCCH format (e.g., PUCCH format 0 or 2 consisting of 1 or 2 symbols) can only support wideband type 1 CSI. In addition, by increasing the size of the subband as the CSI reporting band (e.g., the size of the BWP) becomes larger, the increase in UL overhead caused by the reporting of CSI (e.g., PMI) for each subband due to the expansion of the CSI reporting band is prevented.

[0054] In NRs after Rel.16, it is assumed that a wider bandwidth can be used than in Rel.15 NR. In addition, in NRs after Rel.16, it is also assumed that a higher frequency band (for example, a higher frequency band than 52.6 GHz) can be used than in Rel.15 NR. In addition, a frequency band can also be referred to as a frequency range (FR).

[0055] In Rel.15 NR, subband-based precoding is effective because the subband size is smaller than the coherence bandwidth. For example, when the CSI reporting band is 51 PRBs, the coherence bandwidth is 40 PRBs, and the subband size can also be 4 or 8 PRBs.

[0056] On the other hand, when the CSI reporting band is wider than Rel.15 NR, the subband size becomes larger than the coherent bandwidth, resulting in a concern that the accuracy of CSI reporting will deteriorate. For example, suppose that the CSI reporting band is 260PRB, the coherent bandwidth is 12PRB, but the subband size is 16 or 32PRB. On the other hand, when the ratio of the CSI reporting band to the subband size is maintained in the same manner as Rel.15 NR (the subband size is made sufficiently small compared to the coherent bandwidth), there is a concern that the UL overhead will increase.

[0057] Therefore, a new CSI reporting method is desired that can prevent an increase in UL overhead while preventing a degradation in CSI reporting accuracy.

[0058] However, when using at least one of a wider bandwidth and a higher frequency band than Rel.15 NR, it is assumed that the contribution to sparsity of a precoder using a delay domain (delay domain precoder) is higher than that of a precoder using the space and frequency domain in Rel.15 NR.

[0059] Therefore, the inventors of the present invention have conceived of suppressing the increase of UL overhead while preventing the degradation of CSI reporting accuracy by feeding back information used for a delay area precoder (for example, at least one of the delay information and coefficient information described later) as information (wideband information) related to the entire CSI reporting band (wideband information).

[0060] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings.

[0061] In addition, in this embodiment, the precoder and the precoding may be interpreted mutually. In addition, the precoding vector, the precoding matrix, the channel vector, and the channel matrix may be interpreted mutually. In addition, the delay may be interpreted as the amount of delay (delay amount), etc. In addition, the delay region may be interpreted as a transform region described later, or one or more regions defined as the transform region.

[0062] In addition, in this embodiment, the delay region precoder is mainly used for explanation, but it is sufficient as long as at least the delay region is used. For example, it can also be appropriately applied to a precoder using a space and delay region (space-delaydomain) (also called a 1-dimensional transform region precoder, a 1-dimensional sparse transform region precoder, a space-delay region precoder, etc.), and a precoder using an angular and delay region (angular-delay domain) (also called a 2-dimensional transform region precoder, a 2-dimensional sparse transform region precoder, an angular-delay region precoder, etc.).

[0063] (First method)

[0064] In the first aspect, the description will be mainly based on the information for the delay region precoder fed back as the wideband information.

[0065] <Delayed area precoder>

[0066] The delay region precoder may also be generated (determined) based on at least one of the following parameters.

[0067] coefficient(s) for Q delays g

[0068] Delays for the coefficient(s) τ, or quantized delay τ

[0069] Here, the coefficient g may also be defined for each of the Q delays (for each delay). Q×1 In addition, the delay τ used for the coefficient g may be, for example, τ∈R Q×1 Here, R Q×1 It may also be a set of Q unquantized delays τ. In addition, the quantized delay τ may be, for example, τ∈N Q×1 Here, N Q×1 It can also be a set of Q quantized delays τ. In addition, delay can also be interpreted as delay time, time, etc.

[0070] The coefficient g may be transformed from the delay domain to the frequency domain by multiplying the coefficient g by the corresponding delay τ. The coefficient in the frequency domain may be obtained (derived) by adding the coefficient transformed in the delay domain.

[0071] For example, the precoder d for N subcarriers based on the coefficient g and the delay τ can also be expressed by the following formula 1. In formula 1, Q is the number of delays τ or coefficients g. Q is the subscript of the delay τ or the coefficient g, 0≦q≦Q. In addition, n is the subscript of the subcarrier, 0≦n≦N.

[0072] [Mathematical formula 1]

[0073] (Formula 1)

[0074]

[0075] Here, the coefficient of subcarrier #n (nth subcarrier) in delay #q (qth delay) transformed into the frequency domain can also be expressed by the following equation 2. In addition, power normalization can also be expressed by the following equation 3.

[0076] [Mathematical formula 2]

[0077] (Formula 2)

[0078]

[0079] (Formula 3)

[0080]

[0081] For example, the precoder d of subcarrier #n (0≦n≦N) Q，n When the number of delays Q is 1, 2, or 3, it can be expressed by the following equations 4, 5, and 6, respectively.

[0082] [Mathematical formula 3]

[0083] (Formula 4)

[0084] When Q=1,

[0085] (Formula 5)

[0086] When Q=2,

[0087] (Formula 6)

[0088] When Q=3,

[0089] For example, in equation 4, since the number of delays Q=1, the multiplication result g0·e of the coefficient g0 for delay #0 (q=0) and the delay τ0 for coefficient #0 can also be obtained. －j2πnτ0 , derive the precoder d for subcarrier #n in delay #0 1，n .

[0090] In addition, in equation 5, since the number of delays Q = 1, the precoder d of the subcarrier #n in delay #0 can also be used. 1，n The multiplication result g1·e of the coefficient g1 for delay #1 (q=1) and the delay τ1 for coefficient #1 －j2πnτ1 The addition result is used to derive the precoder d of the subcarrier #n in delay #0 and #1. 2，n .

[0091] In addition, in equation 6, since the number of delays Q = 3, the precoder d of the subcarrier #n in delays #0 and #1 can also be used. 2，n , the multiplication result g2·e of the coefficient g2 for delay #2 (q=2) and the delay τ2 for coefficient #2 －j2πnτ2 The addition result is used to derive the precoder d of the subcarrier #n in the delay #0~#2. 3，n .

[0092] In this way, the coefficient g for the delay domain precoder can also be transformed from the delay domain to the frequency domain by multiplying the coefficient g by the corresponding delay τ. Alternatively, the coefficient d in the frequency domain can be obtained by adding the transformed coefficients.

[0093] <CSI Report>

[0094] The UE may also feed back one or more information (one or more wideband information) related to the entire CSI reporting band (wideband) to the base station. Specifically, the UE may also estimate the channel in a certain area and determine the wideband information based on the estimated channel (channel matrix).

[0095] For example, the UE may also estimate the channel in the space and frequency domains, and transform the estimated channel matrix to the transformation region. Alternatively, the UE may also estimate the channel in the transformation region.

[0096] Here, the transformation region may be, for example, a region for a precoding scheme different from at least one of the time domain, the frequency domain, and the spatial domain. The transformation region may be, for example, any one of the following, or a region combining at least two of them.

[0097] Delayed area

[0098] Delay and corner area

[0099] Delay and spatial domain

[0100] Sparse domain

[0101] · Regions transformed or obtained from the frequency domain

[0102] Regions associated with the frequency domain

[0103] A region related to at least one of the delay and the angle

[0104] Regions with sparsity

[0105] Channel estimation in the spatial and frequency domains

[0106] When performing channel estimation in the space and frequency domains, the UE transforms the estimated channel (channel matrix) to the transformation region, and feeds back information (channel information) related to the transformed channel (channel matrix) as the above-mentioned broadband information to the base station.

[0107] Alternatively, the UE may calculate the precoder in the transform region based on the channel (channel matrix) estimated in the space and frequency domains, and feed back information related to the transform precoder (precoder information) to the base station as the broadband information.

[0108] Channel Estimation in the Transform Region

[0109] When performing channel estimation in the transformed region, the UE may feed back information (channel information) related to the estimated channel (channel matrix) to the base station.

[0110] Alternatively, the UE may calculate the precoder in the transformed region based on the channel (channel matrix) estimated in the transformed region, and feed back information related to the transformed precoder (precoder information) to the base station as the broadband information.

[0111] 《Determination of the Precoder (Channel) Vector》

[0112] The base station may also obtain (determine) a precoder vector (or channel vector) in each subcarrier, each PRB, or multiple PRBs by multiplying one or more broadband information (for example, the above-mentioned channel information or precoder information).

[0113] Figure 1 FIG. 1 is a diagram showing an example of the operation of the CSI report of the first method. Figure 1 As shown, in step S101, the base station sends the RS. In step S102, the UE estimates the channel in a given region (eg, space and frequency domain, or transform region) based on the RS from the base station.

[0114] The UE determines channel information related to the estimated channel (channel matrix), or determines precoder information related to the precoder determined based on the estimated channel (channel matrix). In addition, as described above, when channel estimation is performed in the space and frequency domains, the channel information or precoder information may also be determined after changing the channel (channel column) estimated in the space and frequency domains to the transformation area.

[0115] In step S103, the UE sends one or more pieces of broadband information (for example, one or more pieces of channel information or one or more pieces of precoder information). Figure 2A and 2B is a diagram showing an example of feedback of broadband information according to the first embodiment.

[0116] For example, Figure 2A As shown, the UE may also feed back information related to a broadband and subbands #1 to #k (k>1) to the base station (which may also be referred to as a subband PMI report, etc.).

[0117] In addition, if Figure 2B As shown, the UE may also feed back a plurality of broadband information #1 to #m (1<m<<k) to the base station (which may also be referred to as a broadband PMI report, etc.).

[0118] exist Figure 1In step S104, the base station may also determine the precoding vector (or channel vector) of each subcarrier based on the feedback information from the UE in step S103. The UE may also send a downlink shared channel (e.g., a physical downlink shared channel) in the frequency domain and the spatial domain based on the precoding vector (or channel vector).

[0119] Thus, in this embodiment, based on the report configuration information (eg, 'CSI-ReportConfig' of RRC IE), both the single broadband information and the information related to each subband (eg, Figure 2A ), or multiple broadband information can be reported (for example, Figure 2B ). The UE may also decide which one of the single or multiple broadband information to feed back based on at least one of the report quantity information (eg, 'reportQuantity' of the RRC IE) and the frequency domain information (eg, 'pmi-FormatIndicator' of the RRC IE).

[0120] <Definition of Delay Area Precoder>

[0121] The First Definition

[0122] In the first definition, the subband-based precoder may be replaced and a delay region precoder may be introduced. Specifically, in a certain frequency range (FrequencyRange(FR)), the subband-based precoder may not be supported and the delay region precoder may be supported.

[0123] The FR that does not support subband precoders but supports delay area precoders may be, for example, at least one of 7.125 GHz to 24.25 GHz (also known as FR3, etc.) and 52.6 GHz to 114.25 GHz (also known as FR4, etc.). In addition, FR may also be interpreted as frequency band, band, etc.

[0124] The UE may also receive configuration information related to the delay region precoder (delay region precoder configuration information). The delay region precoder configuration information may also be supported instead of the configuration information related to the subband-based precoder (subband-based precoder configuration information, such as subband-related parameters in the 'reportFreqConfiguration' of the RRC IE).

[0125] Second Definition

[0126] In the second definition, a delay region precoder may be introduced in addition to a subband precoder. Specifically, a certain FR may support a subband precoder and a delay region precoder.

[0127] The FR supporting both the subband precoder and the delay area precoder may be, for example, at least one of 410 MHz to 7.125 GHz (also referred to as FR1, etc.) and 24.25 GHz to 52.6 GHz (also referred to as FR2, etc.).

[0128] The UE may also receive information indicating whether the subband-based precoder or the delay region precoder is applied (application information, such as 'pmi-FormatIndicator' of RRC IE). The UE may also receive at least one of the delay region precoder configuration information and the subband-based precoder configuration information.

[0129] <CSI parameters for delay region precoder>

[0130] In Rel.15 NR, each CSI parameter may also be calculated based on a specific rule. The specific rule may also be based on the dependency between CSI parameters. For example, the LI may also be calculated based on the reported CQI, PMI, RI and CRI. In addition, the CQI may also be calculated based on the reported PMI, RI and CRI. In addition, the PMI may also be calculated based on the reported RI and CRI. The RI may also be calculated based on the reported CRI.

[0131] In the first aspect, the CSI may include a parameter for a delay precoder. The parameter for a delay precoder may include, for example, at least one of the following.

[0132] · A coefficient g (e.g., g∈C Q×1 ) related information (coefficient information)

[0133] Information about the delays for the coefficient(s) τ (e.g., τ∈R Q×1 ), or information about the quantized delay τ (e.g., τ∈N Q×1 ), and in the following, the information related to the delay τ used for the coefficient g and the information related to the quantized delay τ are collectively referred to as delay information.

[0134] Here, the total number of delays Q may also be notified to the UE through at least one of high-layer signaling (eg, RRC signaling) and physical layer signaling. For example, the delay region precoder configuration information may also include information indicating the total number of delays Q.

[0135] Delay Information

[0136] The delay information may be, for example, information indicating each delay τ (also referred to as a delay identifier (delay indicator (DI)) or the like). q The value of can be either non-quantized or quantized.

[0137] In the case of non-quantization, for example, it can also be τ q ∈R, and τ q ≧ 0. Here, R may also be a set of Q delays τ that are not quantized.

[0138] On the other hand, in the case of quantization, for example, τ q = m·T DP Here, m∈N. N can also be a set of Q quantized delays τ. DP It can also be a quantitative unit. For example, T DP It can also be the reciprocal of bandwidth, i.e., 1 / bandwidth. In addition, bandwidth can also be the number of resource blocks that make up the bandwidth. The bandwidth in a broadband system is larger than the subband, so by using T DP , which can increase the particle size.

[0139] The DI fed back as CSI can represent the delay τ q With adjacent delay τ q+1 (or τ q－1 ), which can also be expressed as the delay τ q The gap between the initial delay τ1, or the delay τ q In addition, offset can also be interpreted as gap, offset, difference, etc.

[0140] For example, DI represents the delay τ q With adjacent delay τ q+1 (or τ q－1 ), the offset Δτ can also be expressed by the following formula 7.

[0141] (Formula 7)

[0142] Δτ=[Δτ1,…,ΔτQ－1 ], where Δτ q =τ q+1 -τ q (For example, 1≦q≦Q-1)

[0143] In addition, DI represents the delay τ q In the case of a shift from the initial delay τ1, the shift Δτ can also be expressed by the following equation 8.

[0144] (Formula 8)

[0145] Δτ=[Δτ1,…,Δτ Q－1 ], where Δτ q =τ q+1 -τ1 (for example, when 1≦q≦Q)

[0146] In addition, DI represents the delay τ q In the case of the quantity itself, the delay τ can also be expressed by the following formula 9.

[0147] (Formula 9)

[0148] τ=[τ1,…,τ Q ], (for example, the case where 1≦q≦Q)

[0149] In addition, the above equations 7 to 9 are merely examples and are not limited to the above examples. For example, in equations 7 to 9, the range of the subscript q of the delay τ can also be 0≦q≦Q-2 (or Q-1). In addition, equation 7 can also be Δτ q =τ q -τ q－1 , in this case, it can also be τ q－1 =0. In addition, equation 8 can also be expressed as Δτ q =τ q -τ0 (for example, when 0≦q≦Q-1).

[0150] 《Coefficient Information》

[0151] The coefficient information may be, for example, information representing a matrix for delay precoding (delay precoding matrix identifier (Delay precoding Matrix Indicator (DMI)))), or may be information reusing an existing precoding matrix identifier (Precoding Matrix Indicator (PMI)).

[0152] For example, DMI may also explicitly or implicitly indicate the delay region precoder. DMI is specified separately from the existing PMI. Therefore, the UE can report the CSI including DMI to the base station without adding any modification to the existing PMI.

[0153] On the other hand, the PMI in Rel.15 NR can also explicitly or implicitly indicate the delay region precoder. In this case, the existing signaling for PMI can be reused.

[0154] The above-mentioned DMI or PMI (DMI / PMI) may be information that explicitly indicates the coefficient g, or may be information that indicates the coefficient g in a codebook-based manner.

[0155] The above-mentioned DMI / PMI (1) can also represent the amplitude (amplitude) and phase (phase) of the quantized coefficient g, (2) can also represent the quantized coefficient g based on the modulation order (or modulation method), or (3) can also represent the unquantized coefficient g.

[0156] Alternatively, (4) may define more than one codebook (for example, multiple codebooks of different sizes). In this case, the DMI / PMI may represent a coefficient g selected from the corresponding codebook.

[0157] For example, the coefficient g is set to a coefficient expressed by the following formula 10.

[0158] [Formula 4]

[0159] (Formula 10)

[0160]

[0161] (1) The amplitude and phase of the quantized coefficient g

[0162] The amplitude of the above coefficient g can also be quantized based on a specific (given) number (for example, the number of bits) n. The quantization set (quantization set) can also be specified by {1 / 2^n, 2 / 2^n,…, 1}'0: 1 / (2^n-1): 1'. '0: 1 / (2^n-1): 1' can also represent a set of multiple fractions including 0 and 1, and a set of multiple fractions obtained by increasing the numerator of 1 / (2^n-1) by one between 0 and 1. For example, when n=2, the quantization set can also be {1 / 4, 1 / 2, 3 / 4, 1}. In addition, when n=3, the quantization set can also be {1 / 8, 2 / 8, 3 / 8, 4 / 8, 5 / 8, 6 / 8, 7 / 8, 1}.

[0163] The UE may select a value (closest value) closest to the amplitude of the coefficient g from the quantized set. For example, in the case of n=3, the amplitudes before and after quantization may be expressed as follows.

[0164] [Formula 5]

[0165] Before quantification After quantification

[0166] In addition, the phase of the coefficient g can also be quantized based on a specific (given) number (e.g., number of bits) m. The quantization set can also be specified by {-π, -π+1 / 2^m*2*π, …, -π+(2^m-1) / 2^m*2*π}. For example, in the case of m=2, the quantization set can also be {-π, -π / 2, 0, π / 2}.

[0167] The UE may select a value (closest value) of the phase closest to the coefficient g from the quantized set. For example, in the case of m=2, the phases before and after quantization may be expressed as follows.

[0168] [Mathematical formula 6]

[0169] Before quantification After quantification

[0170] Note that π may be any specific value, and for example, quantization may be performed as -π instead of -1 / 2π.

[0171] (2) The coefficient g after quantization based on the modulation order

[0172] The set based on the modulation order quantization may also be a constellation having 2n-th power values ​​normalized by the maximum amplitude on the constellation. Here, n may also be a given number (eg, each modulation order).

[0173] For example, when n=2, it is Quadrature Phase Shift Keying (QPSK), and the quantization set may be {0.7071+0.7071i, 0.7071-0.7071i, -0.7071+0.7071i, -0.7071-0.7071i}.

[0174] In addition, when n=3, it is 16-bit quadrature amplitude modulation (QAM) (for example, QAM normalized by √1.8), and the quantization set may be {0.2357+0.2357i, 0.2357+0.7071i, 0.7071+0.2357i, 0.7071+0.7071i, 0.2357-0.2357i, 0.2357-0.7071i, 0.7071-0.23 57i, 0.7071-0.7071i, -0.2357+0.2357i, -0.2357+0.7071i, -0.7071+0.2357i, -0.7071 +0.7071i, -0.2357-0.2357i, -0.2357-0.7071i, -0.7071-0.2357i, -0.7071-0.7071i}.

[0175] The UE may also select a value closest to the coefficient g from the quantized set. For example, in the case of n=4, the coefficient g before and after quantization may also be expressed as follows.

[0176] [Formula 7]

[0177] Before quantification After quantification

[0178] Alternatively, codebooks of different sizes may be specified. In this case, the DMI / PMI may also represent a coefficient g selected from the corresponding codebook.

[0179] In addition, the above-mentioned QAM includes not only 16QAM but also 64QAM, 256QAM, etc.

[0180] (4) Codebook

[0181] More than one codebook may be specified (e.g., multiple codebooks of different sizes). As the codebook, a Discrete Fourier Transform (DFT) matrix of a certain size (e.g., 2 to the power of n * 2 to the power of n) may be used. Here, n may also be a specific number (e.g., the number of feedback bits).

[0182] For example, when n=1, one or more matrices of 2×1 may be defined in the codebook (also referred to as a DFT codebook, etc.). For example, the codebook may be expressed as follows.

[0183] [Mathematical formula 8]

[0184]

[0185] The UE may also select a vector having the closest distance to the coefficient g in the codebook. For example, in the case of n=1, the vector selected from the codebook for the coefficient g (refer to the above formula 10) may also be expressed as follows. The coefficient g before and after quantization may also be expressed as follows.

[0186] [Mathematical formula 9]

[0187]

[0188] <Precoder Generation in Frequency Domain>

[0189] As described above, in Rel.15 NR, when subband PMI reporting is set for the UE, the UE feeds back the wideband PMI and the subband PMI of each subband to the base station. The base station may also determine the matrix W1 based on the wideband PMI, or may determine the matrix W2 for each subband based on the subband PMI of each subband.

[0190] The UE may also determine a precoding matrix W for precoding of downlink transmission (eg, PDSCH) based on the matrices W1 and W2. For example, the precoding matrix W may also be calculated using the following equation 11.

[0191] (Formula 11)

[0192] W=W1W2

[0193] On the other hand, when the UE feeds back various broadband information (for example, at least one of coefficient information and delay information), how to define the precoder d becomes a problem.

[0194] In the first embodiment, the precoder d in the frequency domain (which can also be obtained from the codebook g) can be determined based on the coefficient g determined based on the coefficient information (e.g., DMI / PMI) and the delay τ determined based on the delay information (e.g., DI). For example, the precoder d can also be determined using the following formula 12.

[0195] [Formula 10]

[0196] (Formula 12)

[0197]

[0198] Here, Q is the total number of delays, q is the delay subscript, N is the total number of subcarriers, and n is the subcarrier subscript (index).

[0199] Figure 3 FIG. 1 is a diagram showing an example of a precoder for broadband information based on the first embodiment. Figure 3For example, a 1-dimensional (1D)-sparse transform domain precoder (space-delay domain precoder) may be used.

[0200] In addition, Figure 3 In, as in Figure 2B As described in , it is assumed that m (m>1, here, m=2) pieces of broadband information are reported from the UE. Each piece of broadband information may also include at least one of delay information (for example, the above DI) and the coefficient information (for example, the above DMI / PMI).

[0201] For example, in Figure 3 In the example, the total number of delays Q=2, and broadband information #1 and #2 are reported from the UE to the base station. Broadband information #1 may also include DI indicating delay τ1 and DMI / PMI indicating coefficient g1 for delay τ1. In addition, broadband information #2 may also include DI indicating delay τ2 and DMI / PMI indicating coefficient g2 for delay τ2. In addition, the lengths (sizes) of g1 and g2 may also be related to the number of antennas.

[0202] like Figure 3 As shown, the precoder W of subcarrier #i (1≦i≦n) in the case of Q=2 (i) The determination may be made based on at least one of the DI and the DMI / PMI included in each of the m broadband information.

[0203] For example, in Figure 3 In the precoder W (i) It is determined based on the delay τ1 indicated by the DI in the broadband information #1 and the coefficient g1 indicated by the DMI / PMI, and the delay τ2 indicated by the DI in the broadband information #2 and the coefficient g2 indicated by the DMI / PMI.

[0204] In addition, Figure 3 In , the subcarrier index #i is 1≦i≦n, but is not limited to this, and may also be 0≦i≦n-1.

[0205] Figure 4 FIG. 1 is a diagram showing another example of a precoder for broadband information based on the first embodiment. Figure 4 In, for example, a 2D sparse transform domain precoder (2dimension (2D)-sparse transform domain precoder) (angular delay domain precoder) may also be used. Figure 4 In the embodiment, the precoders of the angle region and the delay region can also be combined (joint).

[0206] exist Figure 4 In the example, in addition to m (m>1, here, m=2) broadband information, space-related information (spatial information) is also reported from the UE. Each broadband information may also include delay information (e.g., the above-mentioned DI) and at least one of the coefficient information (e.g., the above-mentioned DMI / PMI).

[0207] Spatial information can also be included with the codebook W ＊＊ The selected codeword CW and at least one of the angles θ are related to the information. ＊＊ The size of may also be related to channel correlation.

[0208] like Figure 4 As shown, the precoder W of subcarrier #i (1≦i≦n) in the case of Q=2 (i) It may be determined based on at least one of the DI and DMI / PMI included in each of the m wideband information, the angle θ determined by the spatial information, and the codeword.

[0209] For example, in Figure 4 In the precoder W (i) The delay τ1 indicated by the DI in the broadband information #1 and the coefficient g1 indicated by the DMI / PMI, the delay τ2 indicated by the DI in the broadband information #2 and the coefficient g2 indicated by the DMI / PMI, the angle θ determined by the spatial information, and the codeword are determined. Figure 4 In , the subcarrier index i is 1≦i≦n, but is not limited thereto and may also be 0≦i≦n-1.

[0210] Here, for Figure 4 The precoder W of subcarrier #i (1≦i≦n) (i) The determined A(θ) can also be specified by the following Equations 13 and 14.

[0211] [Mathematical formula 11]

[0212] (Formula 13)

[0213] A(θ)=[a(θ1),...,a(θ Q )]

[0214] (Formula 14)

[0215]

[0216] Here, M is the number of antennas. Q is the vector g m and θ m Length. g ml and θml The vector g m and θ m The lth (1≦l≦Q) element of . D is the antenna space. In addition, λ C is the wavelength.

[0217] Figure 5 FIG. 1 is a diagram showing another example of a precoder for broadband information based on the first embodiment. Figure 5 In the embodiment, the precoders in the angular region and the delay region are separated. Figure 4 Different. In addition, Figure 5 In the codeword, the angle θ can also be delayed by τ q The time is not common, but for each delay τ q (ie, each broadband information) reports the codeword and the angle θ. Figure 4 Different. Figure 4 The explanation will focus on the differences.

[0218] exist Figure 5 In the example, m (m>1, here, m=2) broadband information is reported from the UE. Each broadband information may include at least one of information related to a codeword for delay τ (codeword information) and information related to an angle θ (angle information) in addition to the delay information (e.g., the above-mentioned DI) and the coefficient information (e.g., the above-mentioned DMI / PMI).

[0219] like Figure 5 As shown, the precoder W of subcarrier #i (1≦i≦n) in the case of Q=2 (i) Alternatively, the angle θ may be determined based on at least one of the DI and DMI / PMI included in each of the m broadband information, the angle θ determined based on the angle information, and the codeword determined based on the codeword information.

[0220] For example, in Figure 5 In the precoder W (i) It is determined based on the delay τ1 represented by the DI in broadband information #1, the coefficient g1 represented by the DMI / PMI, the angle θ1 and the codeword, and the delay τ2 represented by the DI in broadband information #2, the coefficient g2 represented by the DMI / PMI, the angle θ2 and the codeword.

[0221] in addition, Figure 5 A(θ1) and A(θ2) can also be defined in the same manner as the above-mentioned equations 12 and 13, respectively. Figure 5 In , the subcarrier index i is 1≦i≦n, but is not limited to this, and may also be 0≦i≦n-1.

[0222] As described above, in the first method, the UE feeds back each broadband information including at least one of the delay information and the coefficient information. The base station determines the precoder for each subcarrier based on each broadband information. Thus, even if the broadband to which the CSI report is to be reported is widened, it is possible to reduce the UL overhead while preventing the degradation of the CSI reporting accuracy.

[0223] (Second method)

[0224] In the second embodiment, feedback of multiple wideband information corresponding to multiple delays is described. The multiple wideband information may be transmitted in the same CSI reporting occasion or may be distributed and transmitted in multiple CSI reporting occasions.

[0225] Feedback (reporting) of the multiple broadband information in the same CSI reporting opportunity may also be referred to as "first broadband PMI feedback (report)", "first feedback (report)", "first type", "first feedback (report) type", "first broadband feedback (report) type", etc.

[0226] In addition, CSI reporting opportunity can also be interpreted as feedback instance, CSI report, reporting opportunity, reporting instance, reporting timing, etc. The multiple broadband information can also be included in the same uplink control information (Uplink Control Information (UCI)) (the same PUCCH or PUSCH).

[0227] Figure 6 1 is a diagram showing an example of delay τ and coefficient g in a plurality of delay region precoders having different values ​​of the total number of delays Q. Figure 6 In the example, the number of channel paths L = 6 is assumed, but the present invention is not limited to this. Figure 6 In , each value of the delay τ may be each value of the delay after normalization. In addition, each value of the coefficient g may be each value before power normalization.

[0228] like Figure 6 As shown, the set of delay τ1 and coefficient g1 values ​​of the delay region precoder for Q1 delay is included in the set of delay τ2 and coefficient g2 values ​​of the delay region precoder for Q2 (Q2>Q1). Therefore, the delay region precoder can also be called self-contained.

[0229] In a self-contained delay region precoder, if the total number of reported delays Q is increased, a gain in data rate can be obtained. Figure 6In the case of Q=4, a 40% gain in data rate can be obtained compared to Q=2.

[0230] On the other hand, if the total number of delays Q increases, the amount of wideband information fed back in one CSI reporting opportunity also increases. Therefore, multiple wideband information corresponding to multiple delays may be dispersed and fed back in multiple different CSI reporting opportunities.

[0231] Feedback of broadband information of a number equal to the total number of delays Q distributed across multiple CSI reporting opportunities may also be referred to as "incremental feedback", "second broadband PMI feedback (report)", "second feedback (report)", "second type", "second feedback (report) type", "second broadband feedback (report) type", etc.

[0232] Figures 7A to 7C as well as Figure 8 FIG. 4 is a diagram showing an example of the first and second broadband feedback types of the second embodiment. Fig. 7A as well as Figure 7B In FIG. 1 , an example of the first broadband feedback type is shown when the total number of delays Q = 2, 4. Figure 7C , an example of the second broadband feedback type (incremental feedback) is shown when the total number of delays Q=4. Figure 8 In, it means in Figures 7A to 7C An example of values ​​of multiple broadband information reported respectively in CSI reporting opportunities t1 and t2.

[0233] like Fig. 7A , 7B As shown, in the first broadband feedback type, the total number Q of feedback and delay (in Fig. 7A , 7B In the example, there are equal numbers of broadband information #1 to #4 (Q=2, 4). In addition, the CSI reporting opportunity may also be configured for the UE in a certain period.

[0234] like Figure 8 As shown, in the first wideband feedback type (Q=2), the wideband information #1 reported in CSI reporting opportunities t1 and t2 respectively includes delay information related to delay “1” (e.g., Figure 8 τ1, τ2, "1") and coefficient information (for example, Figure 8 On the other hand, the broadband information #2 reported in the CSI reporting opportunities t1 and t2 may also include delay information related to the delay “5” (for example, Figure 8τ1, τ2, indicating the DI of "5") and coefficient information (for example, Figure 8 The DMI / PMI in g1 and g2 represents “0.4518+0.7745i”).

[0235] Similarly, in the first wideband feedback type (Q=4), each of the wideband information #1 to #4 reported in the CSI reporting opportunities t1 and t2 may also include Figure 8 The delay information related to the corresponding values ​​of τ1 and τ2 (for example, DI representing 1, 5, 16 or 25), and Figure 8 The coefficient information related to the corresponding values ​​of g1 and g2 (for example, DMI / PMI representing 1, 0.4518+0.7745i, 0.4524-0.5749i or 0.2459+0.5596i).

[0236] On the other hand, Figure 7C As shown, in the second broadband feedback type (Q=4), the total number of delays Q (in Figure 7C , respectively, Q = 4) equal number of broadband information #1 to #4 can also be distributed to CSI reporting opportunities t1 and t2 for feedback. Figure 7C In the CSI reporting opportunity t1, broadband information #1 and #2 are fed back, and broadband information #3 and #4 are fed back in the CSI reporting opportunity t2.

[0237] In addition, the number of broadband information fed back in one CSI reporting opportunity may also be determined based on the total number of delays Q and the number of CSI reporting opportunities T used in reporting Q broadband information. Figure 7C In , Q=4, T=2, so the number of wideband information fed back in one CSI reporting opportunity is 2.

[0238] like Figure 8 As shown, in the second broadband feedback type (Q=4), each of the broadband information #1 and #2 reported in the CSI reporting opportunity t1 may also include Figure 8 The delay information related to the corresponding value of τ1 (for example, DI representing 1 or 5) and Figure 8 The coefficient information related to the corresponding value of g1 (for example, DMI / PMI representing 1 or 0.4518+0.7745i).

[0239] In addition, each of the broadband information #3 and #4 reported in the CSI reporting opportunity t2 may also include Figure 8 The delay information related to the corresponding value of τ2 (for example, indicating a DI of 16 or 25), and Figure 8The coefficient information related to the corresponding value of g2 (for example, DMI / PMI representing 0.4524-0.5749i or 0.2459+0.5596i).

[0240] like Figure 8 As shown, in the second wideband feedback type (Q=4), the same data rate gain as the first wideband feedback type (Q=4) can be obtained, and the UL overhead can be reduced compared with the first wideband feedback type (Q=4).

[0241] like Figure 7C As shown, in the second broadband feedback type (Q=4), the UE may also perform channel estimation (first channel estimation) for each CSI reporting opportunity, or may perform channel estimation (second channel estimation) for each multiple CSI reporting opportunities (for example, for each CSI reporting opportunity equal to the total number of delays Q).

[0242] Fig. 9A and 9B is a diagram showing an example of a second wideband feedback type according to the second aspect. Fig. 9A And 9B is set to be equal to the total number of delays Q. The broadband information is distributed in T CSI reporting opportunities and fed back. Fig. 9A In the 9B device, Q=4, T=2, so in CSI reporting opportunities t1 and t2, broadband information #1, #2, #3, and #4 are fed back respectively (refer to Figure 7C ).

[0243] exist Fig. 9A In FIG. 1 , an example (first channel estimation) of performing channel estimation at every T or more CSI reporting opportunities is shown. Fig. 9A As shown, the UE may also generate a total number Q0 (for example, in Fig. 9A , Q0=4) an equal amount of broadband information (eg, delay information τ0 and coefficient information g0).

[0244] and the i-th (e.g., 1≦i≦Q) delay τ 0，i The corresponding broadband information may also include the i-th delay τ 0，i The delay information (e.g., DI) and the i-th coefficient g 0，i coefficient information (e.g., DMI / PMI).

[0245] For example, in Fig. 9A In the CSI reporting opportunity t1, of the 4 delays estimated in channel estimation #1, the feedback indicates the first 2 delays τ 0，1 and τ 0，2 The delay information τ1 and the expression coefficient g 0，1 and0，2 The delay information τ1 and the coefficient information g1 can also be used as Figure 7C The broadband information #1 and #2 are fed back.

[0246] In addition, Fig. 9A In the CSI reporting opportunity t2, of the 4 delays estimated in channel estimation #1, the feedback indicates the remaining 2 delays τ 0，3 and τ 0，4 The delay information τ2 and the expression coefficient g 0，3 and 0，4 The delay information τ2 and the coefficient information g2 can also be used as Figure 7C Broadband information #3 and #4 feedback.

[0247] exist Fig. 9A In this case, it is not necessary to perform channel estimation for each CSI reporting opportunity. Therefore, it is possible to reduce the downlink overhead of the RS used for channel estimation.

[0248] exist Fig. 9B In FIG. 1 , an example of performing channel estimation for each CSI reporting opportunity (second channel estimation) is shown. Fig. 9B In the case of UE also performing channel estimation #2 before CSI reporting opportunity t2, Fig. 9A Different. Fig. 9B In Fig. 9A The following explanation will focus on the differences between Fig. 9B In the CSI reporting opportunity t1, Fig. 9A The CSI reporting opportunity t1 is the same.

[0249] For example, in Fig. 9B In the example, channel estimation #2 is performed after CSI reporting opportunity t1 and before CSI reporting opportunity t2. The UE may also regenerate (update) the total number Q0 (for example, in Fig. 9B In the example, Q0=4) contains an equal amount of broadband information (e.g., delay information τ0 and coefficient information g0). In addition, in addition to the result of channel estimation #2, the UE may also update the delay information τ0 and coefficient information g0 based on the delay information τ1 and coefficient information g1 fed back in the CSI reporting opportunity t1.

[0250] exist Fig. 9B The CSI reporting opportunity t2 may also include the updated representation delay τ 0，3 and τ 0，4 The delay information τ2 and the expression coefficient g 0，3 and 0，4 The delay information τ2 and the coefficient information g2 can also be used as Figure 7C The broadband information #3 and #4 are fed back.

[0251] exist Fig. 9B In the CSI reporting process, channel estimation is performed for each CSI reporting opportunity. Therefore, broadband information (for example, at least one of delay information and coefficient information) reflecting the current channel state can be fed back, which can improve spectral efficiency.

[0252] In addition, Fig. 9A In FIG. 9B , the number of CSI feedbacks for feeding back all the delay information and coefficient information of Q delays τ is assumed to be T=2, but the present invention is not limited thereto.

[0253] In the case of T = 2, if Fig. 9A As shown, the UE may also feed back the delay information and coefficient information of a part of the Q delays in the immediately preceding CSI reporting opportunity #i-1, and feed back the delay information and coefficient information of the remaining Q delays in the current CSI reporting opportunity #i. Fig. 9A And in 9B, the amount of broadband information (ie, delay) fed back at each CSI reporting opportunity is 2, but is not limited thereto.

[0254] Fig. 10A 10B is a diagram showing another example of the incremental feedback of the second embodiment. Fig. 10A And 10B is set to be equal to the total number of delays Q, and the wideband information is distributed in T (T>2) CSI reporting opportunities for feedback.

[0255] For example, in Fig. 10A In 10B, Q=4, T=3, so in CSI reporting opportunities t1 and t2, wideband information #1 and #2 are fed back respectively, and in CSI reporting opportunity t3, wideband information #3 and #4 are fed back respectively. Fig. 9A The explanation will focus on the differences between 9B and 9B.

[0256] exist Fig. 10A In the figure, it is shown that Fig. 9A Similarly, an example (first channel estimation) in which channel estimation is not performed for each CSI reporting opportunity. Fig. 10A In the example, wideband information corresponding to Q0 delays (here, Q0=4) is generated based on the result of the same channel estimation and reported in multiple CSI reporting opportunities.

[0257] For example, in Fig. 10A In the example, the UE can also generate a delay τ based on the result of channel estimation #1 (channel matrix H1). 0，i The delay information τ0 and the expression coefficient g 0，iHere, 1≦i≦Q0 (or, 0≦i≦Q0-1), for example, Fig. 10A Q0=4 can also be set.

[0258] For example, Fig. 10A As shown, the delay τ can also be expressed in the CSI reporting opportunity t1. 0，1 The delay information τ1 and the expression coefficient g 0，1 The coefficient information g1 is fed back as broadband information #1. It is also possible to indicate the delay τ in the CSI reporting opportunity t2. 0，2 The delay information τ2 and the expression coefficient g 0，2 The coefficient information g2 is fed back as broadband information #2. In CSI reporting opportunity t3, the delay τ can also be expressed 0，3 , τ 0，4 The delay information τ3 and the expression coefficient g 0，3 , g 0，4 The coefficient information g3 is fed back as broadband information #3 and #4.

[0259] like Fig. 10A As shown, the number of delays (wideband information) reported in each of the T CSI reporting opportunities may not be equal. The number of delays may be determined based on the total number of delays Q and the number of CSI reporting opportunities T used in reporting the Q wideband information.

[0260] exist Fig. 10A In the case of T>2 shown in the figure, if the total number of delays Q is equal, then Fig. 9A Compared with the case of T=2 shown in FIG. 1 , there are cases where the UL overhead of one CSI reporting opportunity can be reduced (for example, Fig. 10A CSI reporting opportunities t1, t2).

[0261] In addition, when T>2, Fig. 10B As shown, channel estimation is performed at each CSI reporting opportunity. Fig. 10B Channel estimation #2, UE operation in #3 and Fig. 9B The same is true for channel estimation #2.

[0262] In the second wideband feedback type as described above, the precoder may also be generated based on Q wideband information fed back in T CSI reporting opportunities.

[0263] Specifically, the frequency domain precoder (codebook) d in CSI reporting opportunity #i may also be based on the frequency domain precoder d in CSI reporting opportunity #i-1. old The precoder d can also be expressed by the following equation 15, for example.

[0264] [Mathematical formula 12]

[0265] (Formula 15)

[0266]

[0267] Here, g may be coefficient information g fed back in CSI reporting opportunity #i. τ may be delay information τ fed back in CSI reporting opportunity #i. f(g, τ) may also be determined using the above-mentioned equation 12, for example.

[0268] In addition, the frequency domain precoder d old It may also be determined based on the delay information τ and coefficient information g fed back in CSI reporting opportunity #i-1. old For example, it can also be determined using the above-mentioned formula 12.

[0269] For example, Fig. 9A As shown in FIG. 9B , it is assumed that the delay information τ1 and the coefficient information g1 are reported in the CSI reporting opportunity t1 , and the delay information τ2 and the coefficient information g2 are reported in the CSI reporting opportunity t2 .

[0270] In this case, d old Alternatively, the precoder d in the frequency domain may be determined based on the delay information τ1 and the coefficient information g1 (for example, using f(τ1, g1) in equation 12). old , delay information τ2 and coefficient information g2. For example, the precoder d in the frequency domain can also use equation 15, by d = d old +f(τ2, g2). Formula 12 can also be used in f(τ2, g2).

[0271] In the second aspect, since a plurality of wideband information corresponding to a plurality of delays is distributed to a plurality of different CSI reporting opportunities and fed back, even if the total number Q of delays increases, an increase in UL overhead can be suppressed.

[0272] (Third Method)

[0273] In Rel.15 NR, the reporting amount information may also indicate any one of 'none', 'cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', 'cri-RSRP', 'ssb-Index-RSRP' or 'cri-RI-LI-PMI-CQI'. The UE may also determine which CSI parameter should be reported based on the reporting amount information. In the third embodiment, the reporting amount information may also be able to specify (indicatable) at least one of 'DMI-DI' (DMI and DI), 'PMI-DI' (PMI and DI), 'DI' (DI), 'DMI' (DMI), and 'PMI' (PMI).

[0274] In the third mode, the UE may also receive at least one feedback (report) information for specifying the delay information τ and the coefficient information g. For example, the information may be the report quantity information (eg, "reportQuantity" of RRC IE).

[0275] In addition, the first broadband feedback type (for example, Fig. 7A 7B) and a second broadband feedback type (e.g., Figure 7C ).

[0276] For example, the above-mentioned report quantity information (for example, reportQuantity of RRC IE) may also indicate a broadband feedback type (for example, any one of the above-mentioned first or second broadband feedback types). Specifically, the report quantity information may also be indicative of at least one of 'DMI / PMI-DI-new' (feeding back DMI / PMI and DI in the first broadband feedback type) and 'DMI / PMI-DI-inc' (feeding back DMI / PMI and DI in the second broadband feedback type).

[0277] Alternatively, the UE may also receive information (type information) on which broadband feedback type is applied, separately from the reporting amount information, and control switching of the first or second broadband feedback type based on the type information.

[0278] The above-mentioned report amount information and the type information may also be notified to the UE through at least one of a high-layer signaling notification (e.g., an RRC signaling notification) and a physical layer signaling notification (e.g., a DCI). For example, the above-mentioned report amount information and the type information may also be included in the above-mentioned report setting information (e.g., "CSI-ReportConfig" of the RRC IE).

[0279] In the third mode, the UE can appropriately control at least one feedback of the delay information τ and the coefficient information g based on the indication information from the base station (for example, the above-mentioned report amount information). In addition, the UE can appropriately control the setting of the first or second broadband feedback based on the indication information from the base station (for example, the above-mentioned report amount information or type information).

[0280] (Wireless Communication System)

[0281] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0282] Fig.11 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in an embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0283] In addition, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Radio Access Technology) (RAT) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0284] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0285] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC) and NR-NR dual connectivity) where both MN and SN are NR base stations (gNB)).

[0286] The wireless communication system 1 may also include: a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and the user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

[0287] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0288] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0289] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0290] Multiple base stations 10 may also be connected by wire (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station may also be referred to as an IAB node.

[0291] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0292] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0293] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. may be used.

[0294] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.

[0295] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and the like may be used.

[0296] In addition, in the wireless communication system 1, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used.

[0297] The PDSCH is used to transmit user data, high-layer control information, system information block (SIB), etc. The PUSCH is also used to transmit user data, high-layer control information, etc. In addition, the PBCH is also used to transmit the master information block (MIB).

[0298] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0299] In addition, the DCI for scheduling PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, PDSCH may also be interpreted as DL data, and PUSCH may also be interpreted as UL data.

[0300] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. One CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a certain search space based on the search space setting.

[0301] A search space may also correspond to PDCCH candidates that are consistent with one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be interchangeable.

[0302] The PUCCH may also be used to transmit at least one uplink control information (uplink control information (UCI)) including channel state information (CSI), delivery confirmation information (e.g., may also be called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.), and scheduling request (Scheduling Request (SR)). The random access preamble code used to establish a connection with a cell may also be transmitted through the PRACH.

[0303] In the present disclosure, downlink, uplink, etc. may be expressed without "link". In addition, various channels may be expressed without "Physical" at the beginning.

[0304] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted.

[0305] The synchronization signal may be, for example, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may also be referred to as an SS / PBCH block, SS block (SS Block (SSB)), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0306] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0307] (Base Station)

[0308] Fig.121 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may be provided with more than one.

[0309] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0310] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0311] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0312] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0313] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmitting unit may also be configured by a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured by a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0314] The transmitting / receiving antenna 130 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0315] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0316] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0317] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0318] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT)) processing (as needed), inverse fast Fourier transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0319] The transmitting and receiving unit 120 (RF unit 122 ) may perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0320] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0321] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0322] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0323] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0324] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0325] In addition, the transmitting and receiving unit 120 may also transmit setting information (report setting information) related to channel state information (CSI) reporting.

[0326] The control unit 110 may also control the reception of information related to the broadband including at least one of information related to the delay and information related to the coefficient corresponding to the delay based on the setting information (for example, Figure 3 , 4 , 5).

[0327] The information related to the coefficient may also represent the amplitude and phase of the coefficient after quantization, the coefficient quantized based on the modulation order, or a vector selected from a codebook.

[0328] The control unit 110 may also control the generation of a precoder in the frequency domain based on the broadband information. The control unit 110 may also control the transmission of a downlink signal (eg, PDSCH) based on the precoder.

[0329] (User Terminal)

[0330] Fig.13 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. In addition, the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided in one or more pieces.

[0331] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0332] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on the common knowledge in the technical field to which the present disclosure relates.

[0333] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0334] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the public knowledge in the technical field involved in the present disclosure.

[0335] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured by a transmitting unit and a receiving unit. The transmitting unit may also be configured by a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured by a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0336] The transmitting / receiving antenna 230 can be constituted by an antenna described based on the common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0337] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0338] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0339] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0340] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0341] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is activated (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0342] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0343] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filtering, demodulation into a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0344] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0345] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signal. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0346] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 , the transmitting and receiving antenna 230 , and the transmission path interface 240 .

[0347] In addition, the transmitting and receiving unit 220 may also receive setting information (report setting information) related to channel state information (CSI) reporting.

[0348] The control unit 210 may also control the transmission of information related to the broadband including at least one of information related to the delay and information related to the coefficient corresponding to the delay based on the setting information (for example, Figure 3 , 4 、5).

[0349] The information related to the coefficient may also represent the amplitude and phase of the coefficient after quantization, the coefficient quantized based on the modulation order, or a vector selected from a codebook.

[0350] The coefficients may also be used for the generation of a precoder in the frequency domain.

[0351] The control unit 210 may also control the transmission of spatial information including at least one of information related to the angle and information related to the codeword, and information related to the broadband (for example, Figure 4 ).

[0352] The information related to the broadband may also include at least one of information related to the angle corresponding to the delay and information related to the codeword corresponding to the delay (for example, Figure 5 ).

[0353] The control unit 210 may control the transmission of a plurality of broadband information each including at least one of information on a plurality of delays and information on a plurality of coefficients corresponding to the delays based on the setting information.

[0354] The control unit 210 may also control the transmission of all of the plurality of broadband information in the same opportunity of the CSI report (the same CSI reporting opportunity).

[0355] The control unit 210 may also control the transmission of the plurality of broadband information distributed to a plurality of opportunities of the CSI report (a plurality of CSI reporting opportunities).

[0356] The control unit 210 may also determine the plurality of broadband information (eg, Fig. 9A , 10A ).

[0357] The control unit 210 may also update a portion of the plurality of broadband information (eg, Fig. 9B , 10B ).

[0358] (Hardware Structure)

[0359] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0360] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0361] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.14 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0362] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. are interchangeable. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0363] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0364] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0365] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0366] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that enables a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0367] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0368] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0369] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 can also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. can also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) can also be installed by the transmitting unit 120a (220a) and the receiving unit 120b (220b) separately physically or logically.

[0370] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0371] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or different buses may be used between the devices.

[0372] In addition, the base station 10 and the user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and the hardware may also be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented by at least one of these hardware.

[0373] (Variation Example)

[0374] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0375] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0376] Here, the parameter set may also refer to a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of the subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, wireless frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, etc.

[0377] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0378] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0379] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be interchangeable.

[0380] For example, a subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and a time slot or a mini time slot may also be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may also be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0381] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0382] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may also be shorter than the TTI.

[0383] In addition, when one time slot or one mini time slot is referred to as TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) may also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling may also be controlled.

[0384] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0385] In addition, long TTI (e.g., normal TTI, subframe, etc.) can also be interpreted as a TTI with a time length exceeding 1 ms, and short TTI (e.g., shortened TTI, etc.) can also be interpreted as a TTI with a TTI length less than that of long TTI and greater than 1 ms.

[0386] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may also include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0387] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0388] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0389] In addition, a resource block may also be composed of one or more resource elements (RE). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

[0390] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0391] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0392] At least one of the configured BWPs may be activated, and the UE may not assume that it will transmit or receive a specific signal / channel other than the activated BWP. In addition, "cell", "carrier" and the like in the present disclosure may also be interpreted as "BWP".

[0393] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0394] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, a wireless resource may also be indicated by a specific index.

[0395] In the present disclosure, the names used for parameters, etc. are not limiting in all respects. In addition, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not limiting in all respects.

[0396] Information, signals, etc. described in the present disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0397] Furthermore, information, signals, etc. can be output from a high layer (upper layer) to a low layer (lower layer) or from a low layer to a high layer. Information, signals, etc. can also be input and output via a plurality of network nodes.

[0398] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0399] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0400] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0401] Furthermore, notification of specific information (for example, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (for example, by not notifying the specific information or by notifying other information).

[0402] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0403] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0404] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0405] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0406] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0407] In the present disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro cell, and pico cell.

[0408] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0409] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” are used interchangeably.

[0410] In some cases, the mobile station is also referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a hand set, a user agent, a mobile client, a client, or some other appropriate terminology.

[0411] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may also be a device carried in a mobile body, a mobile body, etc. The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous driving vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0412] In addition, the base station in the present disclosure can also be interpreted as a user terminal. For example, the various methods / implementations of the present disclosure can also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it can also be called device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a structure in which the user terminal 20 has the functions of the above-mentioned base station 10. In addition, expressions such as "uplink" and "downlink" can also be interpreted as expressions corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be interpreted as side channels.

[0413] Likewise, the user terminal in the present disclosure may also be interpreted as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0414] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node according to the circumstances. Obviously, in a network including one or more network nodes having a base station, various actions performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, Mobility Management Entity (MME)), Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0415] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0416] The various modes and implementation modes described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these. In addition, multiple systems can also be combined (for example, LTE or LTE-A, combination with 5G, etc.) for application.

[0417] The term “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the term “based on” means both “based only on” and “based at least on”.

[0418] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to a first and a second element does not mean that only two elements can be used, or that the first element must take precedence over the second element in some form.

[0419] The term "determining" as used in this disclosure may include a variety of actions in some cases. For example, "determining" may also be viewed as "judging", calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0420] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc.

[0421] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on some actions.

[0422] In addition, "judgment (decision)" can also be interpreted as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0423] The “maximum transmit power” recorded in the present disclosure may refer to the maximum value of the transmit power, or may refer to the nominal maximum transmit power (the nominal UE maximum transmit power), or may refer to the rated maximum transmit power (the rated UE maximum transmit power).

[0424] The terms "connected", "coupled", or all their variations used in this disclosure mean all direct or indirect connections or combinations between two or more elements, and may include the situation where there are one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination of these. For example, "connection" may also be interpreted as "access".

[0425] In the present disclosure, when two elements are connected, it can be considered that they are "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0426] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted as "different".

[0427] In the present disclosure, when the terms "include", "including", and their variations are used, these terms, like the term "comprising", have an inclusive meaning. Furthermore, the term "or" used in the present disclosure does not mean an exclusive OR.

[0428] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0429] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the present invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A receiving unit receives setting information including multiple delays for channel state information CSI reporting; and a control unit that generates broadband information including a plurality of coefficients corresponding to the plurality of delays, based on the setting information, and controls transmission of CSI including the broadband information including the plurality of coefficients, Each of the plurality of coefficients represents a quantized amplitude and phase.

2. A wireless communication method of a terminal, comprising: The step of receiving setting information including a plurality of delays for channel state information (CSI) reporting; generating broadband information including a plurality of coefficients corresponding to the plurality of delays respectively based on the setting information, and controlling the transmission of CSI including the broadband information including the plurality of coefficients, Each of the plurality of coefficients represents a quantized amplitude and phase.

3. A system having a terminal and a base station, The terminal has: A receiving unit receives setting information including multiple delays for channel state information CSI reporting; and a control unit that generates broadband information including a plurality of coefficients corresponding to the plurality of delays, based on the setting information, and controls transmission of CSI including the broadband information including the plurality of coefficients, Each of the plurality of coefficients represents a quantized amplitude and phase, The base station has: A sending unit sends the setting information.

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