Terminal, wireless communication method, base station, and system

Abstract

To provide a terminal, a radio communication method, a base station, and a system by which an uplink control channel can be transmitted properly.SOLUTION: In a radio communication system, a terminal determines the number of bits of a delivery acknowledgment signal, when configured to use a dynamic delivery acknowledgment signal codebook for a downlink shared channel for reception, on the basis of a value of total downlink assignment indicator included in a downlink control channel. When a plurality of downlink control channels are allocated to different time resources, a value of the total downlink assignment indicator included in each of the plurality of downlink control channels indicates the number of downlink assignments arranged in a time direction and a frequency direction. The delivery acknowledgment signal uses mapping of cyclic shifts or complex-valued modulation symbols, and controls transmission of the delivery acknowledgment signal, on the basis of feedback timing of the delivery acknowledgment signal set in higher layer signaling when configured to use a semi-static delivery acknowledgment signal codebook.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a terminal, a wireless communication method, a base station, and a system in a next-generation mobile communication system.

Background Art

[0002] In a UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been standardized for the purpose of further high data rates, low latency, etc. (Non-Patent Document 1). Further, for the purpose of further bandwidth expansion and speed increase from LTE, successor systems of LTE (for example, also referred to as LTE-A (LTE-Advanced), FRA (Future Radio Access), 4G, 5G, 5G+ (plus), NR (New RAT), LTE Rel. 14, 15 and later, etc.) are also being studied.

[0003] In an existing LTE system (for example, LTE Rel. 8-13), communication in the downlink (DL: Downlink) and / or uplink (UL: Uplink) is performed using a 1 ms subframe (also referred to as a transmission time interval (TTI)). The subframe is a transmission time unit of one channel-encoded data packet, and is a processing unit for scheduling, link adaptation, retransmission control (HARQ: Hybrid Automatic Repeat reQuest), etc.

[0004] In an existing LTE system (e.g., LTE Rel.8-13), a user terminal transmits uplink control information (UCI) using an uplink control channel (e.g., PUCCH: Physical Uplink Control Channel) or an uplink data channel (e.g., PUSCH: Physical Uplink Shared Channel). The configuration (format) of the uplink control channel is called a PUCCH format (PF), etc.

[0005] Also, in an existing LTE system, a user terminal multiplexes and transmits a UL channel and a DMRS (Demodulation Reference Signal) within a 1 ms TTI. Within a 1 ms TTI, multiple DMRSs of different layers (or different user terminals) of the same user terminal are orthogonally multiplexed using a cyclic shift (CS) and / or an orthogonal spreading code (e.g., an orthogonal cover code (OCC)).

Prior Art Documents

Non-Patent Documents

[0006]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] In a future wireless communication system (e.g., LTE Rel. 15 and later, 5G, 5G+, NR, etc.), when transmitting UCI using an uplink control channel (e.g., PUCCH), if the PUCCH is not properly transmitted, there is a risk that the UCI may not be correctly recognized by the network (NW, radio base station, gNB, etc.).

[0008] The present invention has been made in view of such a point, and one of its objects is to provide a terminal, a wireless communication method, a base station, and a system that can properly transmit an uplink control channel.

Means for Solving the Problems

[0009] A terminal according to one aspect of the present invention includes a receiving unit that receives at least one downlink shared channel scheduled by at least one downlink control channel, and when it is set to use a dynamic delivery confirmation signal codebook for the at least one downlink shared channel, based on the value of the total downlink allocation indicator included in the at least one downlink control channel, a control unit that determines the number of bits of the delivery confirmation signal for the at least one downlink shared channel, and when a plurality under When the plurality of control channels are allocated to different time resources, said a plurality under The value of the total downlink allocation indicator included in each of the plurality of control channels indicates the number of downlink allocations arranged in the time direction and the frequency direction. In the mapping of the delivery confirmation signal, a 1-bit or 2-bit delivery confirmation signal uses cyclic shift or complex-valued modulation symbol mapping, and the control unit In a serving cell, When it is set to use a quasi-static delivery confirmation signal codebook, the feedback timing of the delivery confirmation signal set by upper layer signaling the maximum number of downlink transmissions scheduled over a range associated therewith is characterized by controlling the transmission of the delivery confirmation signal based on this.

Advantages of the Invention

[0010] According to the present invention, in a future wireless communication system, an uplink control channel can be properly transmitted.

Brief Description of the Drawings

[0011]

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Figure 16

Embodiment for Carrying Out the Invention

[0012] In future wireless communication systems (e.g., LTE Rel.15 and later, 5G, NR, etc.), configurations (also referred to as formats, PUCCH formats (PF), etc.) for the uplink control channel (e.g., PUCCH) used for UCI transmission are being studied. For example, in LTE Rel.15, it is being studied to support five types of PF0 to 4. Note that the names of the PFs shown below are merely examples, and different names may be used.

[0013] For example, PF0 and 1 are PFs used for transmitting UCI of up to 2 bits (e.g., transmission of delivery confirmation information (HARQ-ACK: Hybrid Automatic Repeat reQuest-Acknowledge, also referred to as ACK or NACK, etc.)). Since PF0 can be allocated to 1 or 2 symbols, it is also called short PUCCH or sequence-based short PUCCH, etc. On the other hand, since PF1 can be allocated to 4 - 14 symbols, it is also called long PUCCH, etc. In PF1, multiple user terminals may be code-division multiplexed (CDM) within the same resource block (physical resource block (PRB)) by block-wise spreading in the time domain using at least one of cyclic shift (CS) and orthogonal sequences (e.g., OCC (Orthogonal Cover Code), time domain OCC).

[0014] PF2-4 is a PF used for transmitting UCI (e.g., Channel State Information (CSI) (or CSI, HARQ-ACK, and / or Scheduling Request (SR))) with more than 2 bits. Since PF2 can be allocated to 1 or 2 symbols, it is also called a short PUCCH, etc. On the other hand, PF3 and 4 can be allocated to 4 - 14 symbols, so they are also called long PUCCH, etc. In PF4, orthogonal sequences (e.g., OCC, pre-DFT OCC, frequency-domain OCC) may be used for CDM of UCI of multiple user terminals using block spreading in the (frequency domain) before DFT. In PF4, Demodulation Reference Signal (DMRS) may be used for CDM of UCI of multiple user terminals using block spreading in the (frequency domain) before DFT.

[0015] The allocation of resources (e.g., PUCCH resources) used for transmitting the uplink control channel is performed using upper layer signaling and / or Downlink Control Information (DCI). Here, the upper layer signaling may be, for example, at least one of Radio Resource Control (RRC) signaling, system information (e.g., at least one of Remaining Minimum System Information (RMSI), Other system information (OSI), Master Information Block (MIB), System Information Block (SIB)), and broadcast information (Physical Broadcast Channel (PBCH)).

[0016] Specifically, for the user terminal, one or more sets (PUCCH resource sets) each including one or more PUCCH resources are notified (configured) to the user terminal by upper layer signaling. For example, for the user terminal, K (e.g., 1 ≤ K ≤ 4) PUCCH resource sets may be notified from the network (NW, radio base station, gNB, etc.). Each PUCCH resource set may include M (e.g., 4 ≤ M ≤ 8) PUCCH resources.

[0017] The user terminal may determine a single PUCCH resource set from the configured K PUCCH resource sets based on the payload size of the UCI (UCI payload size). The UCI payload size may be the number of bits of the UCI that does not include cyclic redundancy check (CRC) bits.

[0018] The user terminal may determine the PUCCH resource to be used for transmitting the UCI from the M PUCCH resources included in the determined PUCCH resource set based on at least one of DCI and implicit information (such as implicit indication information, implicit index, or implicit index).

[0019] FIG. 1 is a diagram showing an example of PUCCH resource allocation. In FIG. 1, as an example, let K = 4, and assume that four PUCCH resource sets #0 - #3 are configured for the user terminal from the radio base station by upper layer signaling. Also, assume that PUCCH resource sets #0 - #3 each include M (e.g., 4 ≤ M ≤ 8) PUCCH resources #0 - #M - 1. Note that the number of PUCCH resources included in each PUCCH resource set may be the same or different.

[0020] In FIG. 1, each PUCCH resource set for a user terminal may include values of at least one of the following parameters (also referred to as fields or information, etc.). Note that for each parameter, a range of values that can be taken for each PUCCH format may be defined. · Symbol at which PUCCH allocation starts (starting symbol, first symbol) · Number of symbols allocated to PUCCH within a slot (period allocated to PUCCH) · Index of the resource block at which PUCCH allocation starts (starting PRB, first (lowest) PRB) (e.g., PUCCH-starting-PRB) · Number of PRBs allocated to PUCCH (e.g., for PF2 or 3) · Whether frequency hopping is enabled or disabled for the PUCCH resource (e.g., PUCCH-frequency-hopping) · Frequency resource after frequency hopping (second hop) (e.g., index of the starting PRB or first (lowest) PRB at the second hop, PUCCH-2nd-hop-PRB) · Index of the initial cyclic shift (CS) (e.g., for PF0 or 1) · Index of the orthogonal sequence in the time domain (e.g., time domain OCC) (e.g., for PF1) · Length of the orthogonal sequence (also referred to as Pre-DFT OCC length, spreading rate, etc.) used for block-wise spreading before discrete Fourier transform (DFT) (e.g., for PF4) · Index of the orthogonal sequence (e.g., Pre-DFT OCC) used for block-wise spreading before DFT (e.g., for PF4)

[0021] As shown in FIG. 1, when PUCCH resource sets #0 to #3 are configured for the user terminal, the user terminal selects one of the PUCCH resource sets based on the UCI payload size.

[0022] For example, when the UCI payload size is 1 or 2 bits, PUCCH resource set #0 is selected. Also, when the UCI payload size is 3 bits or more and N2 - 1 bits or less, PUCCH resource set #1 is selected. Further, when the UCI payload size is N2 bits or more and N3 - 1 bits or less, PUCCH resource set #2 is selected. Similarly, when the UCI payload size is N3 bits or more and N3 - 1 bits or less, PUCCH resource set #3 is selected.

[0023] Thus, the range of UCI payload sizes for which PUCCH resource set #i (i = 0, …, K - 1) is selected is N i bits or more and N i+1 - 1 bits or less (i.e., {N i , …, N i+1 - 1} bits).

[0024] Here, the start positions (start bit numbers) N0, N1 of the UCI payload sizes for PUCCH resource sets #0 and #1 may be 1 and 3 respectively. Thereby, when transmitting UCI of 2 bits or less, PUCCH resource set #0 is selected, so PUCCH resource set #0 may include PUCCH resources #0 to #M - 1 for at least one of PF0 and PF1. On the other hand, when transmitting UCI exceeding 2 bits, one of PUCCH resource sets #1 to #3 is selected, so PUCCH resource sets #1 to #3 may each include PUCCH resources #0 to #M - 1 for at least one of PF2, PF3 and PF1.

[0025] When i = 2, …, K - 1, information (start position information) indicating the start position (N i ) of the UCI payload size for PUCCH resource set #i may be notified (configured) to the user equipment using upper layer signaling. The start position (N i ) may be specific to the user equipment. For example, the start position (N i) may be set to a value in the range of 4 bits or more and 256 or less (for example, a multiple of 4). For example, in FIG. 1, information indicating the start positions (N2, N3) of the UCI payload sizes for PUCCH resource sets #2 and #3 is notified to the user equipment by upper layer signaling (for example, user-specific RRC signaling), respectively.

[0026] The maximum payload size of UCI for each PUCCH resource set is given by N K -1. N K may be explicitly notified (set) to the user equipment by upper layer signaling and / or DCI, or may be implicitly derived. For example, in FIG. 1, N0 = 1 and N1 = 3 are specified in the specification, and N2 and N3 may be notified by upper layer signaling. Also, N4 may be specified in the specification (for example, N4 = 1000).

[0027] In the case shown in FIG. 1, the user equipment can determine a single PUCCH resource to be used for transmitting UCI from among PUCCH resources #0 to #M-1 included in the PUCCH resource set selected based on the UCI payload size, based on the value of a predetermined field of DCI and / or other parameters. For example, when the number of bits of the predetermined field is 2 bits, four types of PUCCH resources can be specified. The other parameter may be a CCE index. For example, the PUCCH resource may be associated with a combination of 2-bit DCI and other parameters, or may be associated with 3-bit DCI.

[0028] For example, when the UCI is HARQ-ACK, the user equipment (UE) may determine one from a plurality of PUCCH resource sets set by the upper layer according to the UCI payload size, and determine one PUCCH resource based on DCI and / or other parameters from the determined PUCCH resource set. The method for notifying the PUCCH resource using the above PUCCH resource set may also be used when the UCI encodes HARQ-ACK and other UCI (for example, CSI and / or SR) and transmits them simultaneously.

[0029] On the other hand, when the UCI does not include HARQ-ACK, the PUCCH resource may be notified without using the PUCCH resource set. For example, when the UCI is CSI and / or SR, the UE may use the PUCCH resource semi-statically set by the upper layer.

[0030] In addition, in NR, it is being considered that the user equipment determines the HARQ-ACK size (HARQ-ACK codebook) semi-statically or dynamically and performs HARQ-ACK transmission using the PUCCH. For example, the base station notifies the UE of the method for determining the HARQ-ACK codebook by upper layer signaling.

[0031] When the mode for the UE to determine the HARQ-ACK codebook semi-statically is set (for example, when it is determined to be type 1), the UE determines the number of bits of HARQ-ACK, etc. based on the configuration set by upper layer signaling. The configuration set by upper layer signaling (higher-layer configuration) may be, for example, the maximum number of DL transmissions (for example, PDSCH) scheduled over a range associated with the HARQ-ACK feedback timing.

[0032] The range associated with the HARQ-ACK feedback timing corresponds to at least one (e.g., all) of space, time, and freq. Also, the range associated with the HARQ-ACK feedback timing is also referred to as the HARQ-ACK bundling window, the HARQ-ACK feedback window, the bundling window, or the feedback window.

[0033] On the other hand, when the mode for the UE to dynamically determine the HARQ-ACK codebook is set (e.g., when it is determined to be type 2), the UE may determine the number of HARQ-ACK bits, etc. based on the bits specified in the DL assignment index (DAI: Downlink Assignment Indicator (Index)) field included in the downlink control information (e.g., DL assignment).

[0034] Also, in NR, as the uplink control channel configuration (PUCCH format) used for HARQ-ACK transmission, the PUCCH format used for UCI transmission with a predetermined number of bits or less and the PUCCH format used for UCI transmission with a number of bits greater than the predetermined number are supported. The PUCCH format used for UCI transmission with a predetermined number of bits or less (e.g., up to 2 bits) may be referred to as PUCCH format 0 or PUCCH format 1 (PF0, PF1). The PUCCH format used for UCI transmission with a number of bits greater than the predetermined number (e.g., more than 2 bits) may be referred to as PUCCH formats 2-4 (PF2, PF3, PF4).

[0035] As PF0, a sequence with a sequence length of 12 is considered to be mapped to 12 consecutive REs (Resource Elements) within a PRB (Physical Resource Block). Sequences with sequence lengths of 24 and 48 may also be used. The sequence of PF0 and other sequences may be multiplexed using CDM (CDM: Code Division Multiplexing) or FDM. The sequence of PF0 has a cyclic shift (CS, phase rotation) applied to the reference sequence.

[0036] The reference sequence may be a CAZAC (Constant Amplitude Zero Auto-Correlation) sequence such as a Zadoff-Chu sequence (e.g., a low PAPR (peak-to-average power ratio) sequence), a sequence defined by the specification (e.g., a low PAPR sequence, a sequence given in a table), or a sequence conforming to a CAZAC sequence (a CG-CAZAC (computer generated CAZAC) sequence). For example, PUCCH with a bandwidth of 1 PRB may use one of a predetermined number (e.g., 30, 60, or a predetermined value determined from the reference sequence length) of sequences defined by the specification as the reference sequence. The reference sequence may be used for UCI or for DMRS.

[0037] The case where the PUCCH of PF0 transmits 2-bit UCI using CS will be described. Since CS may be represented by the amount of phase rotation, it may be referred to as the amount of phase rotation. A plurality of candidates for CS (CS candidates) assigned to one UE are called a CS candidate set (CS amount set, CS amount pattern, phase rotation amount candidate set, phase rotation amount pattern).

[0038] The length of the reference sequence is determined by the number of subcarriers M and the number of PRBs (Physical Resource Blocks). When transmitting the PUCCH of PF0 using the bandwidth of 1 PRB, the length of the reference sequence is 12 (= 12 × 1). In this case, there are 12 phase rotation amounts α0 - α with a phase interval of 2π / 12 (i.e., π / 6). 11 (CS0 - 11) is defined. One reference sequence is phase - rotated (cyclic - shifted) using the phase rotation amount α0 - α 11 to obtain 12 sequences that are orthogonal to each other (the cross - correlation is 0). Note that the phase rotation amount α0 - α 11 may be defined based on at least one of the number of subcarriers M, the number of PRBs, and the length of the reference sequence. The CS candidate set may include two or more phase rotation amounts selected from among the phase rotation amounts (cyclic - shifts) α0 - α 11 . The indices 0 - 11 of the phase rotation amount may be referred to as CS (CS index).

[0039] The PUCCH of PF0 notifies UCI including at least one of HARQ - ACK (ACK / NACK, A / N), CSI, and SR.

[0040] For example, when the UCI is 1 bit indicating HARQ - ACK, the UCI values 0 and 1 may correspond to "NACK" (negative response) and "ACK" (positive response), respectively. For example, when the UCI is 2 bits indicating HARQ - ACK, the UCI values 00, 01, 11, and 10 may correspond to "NACK - NACK", "NACK - ACK", "ACK - ACK", and "ACK - NACK", respectively.

[0041] For example, when the UCI is 2 bits, the UE transmits a signal to which the CS corresponding to the value to be transmitted is applied using the given time / frequency resource among the four candidates (UCI candidates, candidate values) of the 2 - bit UCI. The time / frequency resource is a time resource (e.g., symbol, etc.) and / or a frequency resource (e.g., PRB, etc.).

[0042] For the transmission signal generation process for the PUCCH of PF0, the UE rotates (circularly shifts) the reference sequence X0-X of sequence length M by the selected phase rotation amount (CS), and inputs the phase-rotated reference sequence to a CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) transmitter or a DFT-S-OFDM (Discrete Fourier Transform-Spread-Orthogonal Frequency Division Multiplexing) transmitter. The UE transmits the output signal from the CP-OFDM transmitter or the DFT-S-OFDM transmitter. M-1

[0043] Next, the decoding of the UCI notified by the PUCCH of PF0 will be described. Here, the reception determination operation in the case of notifying the UCI by the selection of the phase rotation amount will be described, but the same applies to the case of notifying the UCI by the selection of other types of resources (for example, reference sequences, time / frequency resources) or combinations of multiple types of resources.

[0044] The NW may determine the UCI from the received signal using maximum likelihood detection (MLD: Maximum Likelihood Detection, or may be called correlation detection). Specifically, the network generates replicas of each phase rotation amount assigned to the user terminal (phase rotation amount replicas) (for example, when the UCI payload length is 2 bits, generates 4 patterns of phase rotation amount replicas), and may generate a transmission signal waveform in the same manner as the user terminal using the reference sequence and the phase rotation amount replicas. Further, the network may calculate the correlation between the obtained transmission signal waveform and the received signal waveform received from the user terminal for all the phase rotation amount replicas, and estimate that the phase rotation amount replica with the highest correlation was transmitted.

[0045] ​More specifically, for each element of the received signal sequence (a sequence of M complex numbers) after DFT of size M, the network multiplies it by the complex conjugate of the transmitted signal sequence (a sequence of M complex numbers) obtained by applying a phase rotation of the phase rotation amount replica to the reference sequence of the transmitted signal, and assumes that the phase rotation amount replica for which the absolute value (or the square of the absolute value) of the sum of the obtained M sequences is maximized is sent.

[0046] Alternatively, the network may generate replicas of the transmitted signal for the maximum number of allocated phase rotation amounts (12 for 1 PRB), and estimate the phase rotation amount with the highest correlation with the received signal in the same operation as the above MLD. When a phase rotation amount other than the allocated phase rotation amount is estimated, it may be assumed that the phase rotation amount closest to the estimated phase rotation amount among the allocated phase rotation amounts is sent.

[0047] A plurality of values of UCI transmitted by PUCCH of PF0 are associated with CS. The UE applies the CS obtained by adding the CS corresponding to the value of UCI to be transmitted to the initial CS to the reference sequence.

[0048] As the association (mapping) between the value of UCI and CS for PF0, the following first mapping is under consideration.

[0049] As shown in FIGS. 2A and 3A, in PF0, cyclic shifts 0 and 6 may be respectively associated (mapped) with 1-bit HARQ-ACK values 0 and 1.

[0050] As shown in FIGS. 2B and 3B, for PF0, cyclic shifts 0, 3, 6, and 9 may be respectively associated with 2-bit HARQ-ACK values {0, 0}, {0, 1}, {1, 1}, and {1, 0}.

[0051] As shown in FIGS. 2C and 3A, in PF0, cyclic shifts 3 and 9 may be respectively associated with 1-bit HARQ-ACK values 0 and 1 with a positive SR.

[0052] As shown in FIGS. 2D and 3B, in PF0, cyclic shifts 1, 4, 7, 10 may be respectively associated with 2-bit HARQ-ACK values {0, 0}, {0, 1}, {1, 1}, {1, 0} with positive SR.

[0053] Also, the value of UCI indicating only SR without HARQ-ACK may be associated with a different CS from the CS of HARQ-ACK only.

[0054] As an association (mapping) between the bit value of UCI for PF1 and the complex-valued modulation symbol, the following first mapping is being considered.

[0055] When the UCI of PF1 is 1 bit, the complex-valued modulation symbol x corresponding to the value b(i) of UCI is given by the following equation.

Equation

[0056] When the UCI of PF1 is 2 bits, the complex-valued modulation symbol x corresponding to the value b(i) of UCI is given by the following equation.

Equation

[0057] That is, for 0 and 1 which are 1-bit values b(0), two complex-valued modulation symbols x, (1 + j) / sqrt(2) and (-1 - j) / sqrt(2) are respectively associated. For PF1, for {0, 0}, {0, 1}, {1, 1}, {1, 0} which are 2-bit values {b(0), b(1)}, four complex-valued modulation symbols x, (1 + j) / sqrt(2), (1 - j) / sqrt(2), (-1 + j) / sqrt(2), (-1 - j) / sqrt(2) may be respectively associated. Here, sqrt(2) represents the square root of 2. The UE may be configured with PUCCH resources for HARQ-ACK and PUCCH resources for SR. When the UE transmits a HARQ-ACK without a positive SR, it uses the PUCCH resource for HARQ-ACK to transmit a complex-valued modulation symbol indicating a 2-bit HARQ-ACK. When the UE transmits a HARQ-ACK with a positive SR, it uses the PUCCH resource for SR to transmit a complex-valued modulation symbol indicating a 2-bit HARQ-ACK. The NW may recognize the presence or absence of an SR based on which of the two PUCCH resources is used.

[0058] The problem of HARQ-ACK when two PDCCHs each including a DL allocation are transmitted will be described.

[0059] When more than two (three or more) PDCCHs are transmitted, the HARQ-ACK for more than two PDSCHs scheduled by those PDCCHs is transmitted using PF2, PF3, or PF4. Therefore, the NW can correctly recognize the HARQ-ACK.

[0060] When the UE is configured to use a quasi-static HARQ-ACK codebook and two PDCCHs each including a DL allocation are transmitted (allocated), even if the UE fails to detect one of the two PDCCHs, it can recognize that two PDCCHs have been transmitted and which PDCCH detection has failed, and thus transmits a 2-bit HARQ-ACK. Therefore, the NW can correctly recognize the 2-bit HARQ-ACK.

[0061] The UE is configured to use the dynamic HARQ-ACK codebook. When two PDCCHs each containing a DL assignment are transmitted (allocated) in more than one (two or more) serving cells and / or CCs, even if the UE fails to detect one of the two PDCCHs, the UE can recognize that two PDCCHs have been transmitted and which PDCCH detection has failed through the DAI (Downlink Assignment Indicator), so it transmits a 2-bit HARQ-ACK. Therefore, the NW can correctly recognize the 2-bit HARQ-ACK.

[0062] The case where the UE is configured to use the dynamic HARQ-ACK codebook and two PDCCHs each containing a DL assignment are transmitted (allocated) in one serving cell and / or CC and the NW assumes the reception of a 2-bit HARQ-ACK based on the two PDCCHs will be described. In this case, the two PDCCHs are transmitted in different slots or symbols.

[0063] If the UE fails to detect the first PDCCH among the two PDCCHs, the UE can recognize that two PDCCHs have been transmitted and that the detection of the first PDCCH has failed through the DAI, so it transmits a 2-bit HARQ-ACK.

[0064] However, if the UE fails to detect the second PDCCH among the two PDCCHs, the UE cannot recognize that two PDCCHs have been transmitted and that the detection of the second PDCCH has failed through the DAI, so it transmits a 1-bit HARQ-ACK. Since the NW assumes the reception of a 2-bit HARQ-ACK, it may misinterpret the HARQ-ACK.

[0065] The PDCCH that schedules the PDSCH may include a DAI (Downlink Assignment Indicator). The DAI may include a counter DAI and a total DAI. The total DAI may indicate the total number of at least one DL assignment arranged in the frequency direction. The counter DAI may indicate the number (index) of at least one DL assignment (Downlink Assignment) arranged in the time direction and / or the frequency direction.

[0066] Figure 4 shows the DAI (total DAI, counter DAI) when two PDCCHs each including a DL assignment are transmitted in more than one serving cell and / or CC (Component Carrier). The DAI of PDCCH#1 indicates (2, 1), and the DAI of PDCCH#2 indicates (2, 2).

[0067] If the UE fails to detect PDCCH#1 and succeeds in detecting PDCCH#2, the UE detects only one PDCCH with DAI (2, 2), and the UE can recognize that it has failed to detect the first PDCCH and succeeded in detecting the second PDCCH among the two PDCCHs. If the UE succeeds in detecting PDCCH#1 and fails to detect PDCCH#2, the UE detects only one PDCCH with DAI (2, 1), and the UE can recognize that it has succeeded in detecting the first PDCCH and failed to detect the second PDCCH among the two PDCCHs.

[0068] Figure 5 shows the DAI (total DAI, counter DAI) when two PDCCHs each including a DL assignment are transmitted in one serving cell and / or CC, different symbols or slots. The DAI of PDCCH#1 indicates (1, 1), and the DAI of PDCCH#2 indicates (1, 2).

[0069] Since the NW may not recognize that PDCCH#2 is being sent when sending PDCCH#1, the total DAI indicates the number of DL assignments in the frequency direction (serving cell and / or CC).

[0070] If the UE fails to detect PDCCH#1 and succeeds in detecting PDCCH#2, the UE detects only one PDCCH with DAI being (1, 2), and the UE can recognize that it has failed to detect the first PDCCH and succeeded in detecting the second PDCCH among the two PDCCHs. If the UE succeeds in detecting PDCCH#1 and fails to detect PDCCH#2, the UE detects only one PDCCH with DAI being (1, 1), the UE can recognize that only one PDCCH out of the two PDCCHs has been transmitted, and it cannot recognize that it has failed to detect the second PDCCH.

[0071] Figure 6 shows the DAI (total DAI, counter DAI) when one PDCCH including DL allocation is transmitted. The DAI of PDCCH#1 indicates (1, 1). The UE can detect only one PDCCH with DAI being (1, 1) and recognize that only one PDCCH exists.

[0072] As shown in Figure 5, in the same frequency resource (one serving cell and / or CC), two PDCCHs arranged in different time resources (slot or symbol) are transmitted, and the problem in the case of using the first mapping will be described. PDCCH#1 and #2 schedule PDSCH#1 and #2 respectively.

[0073] If the UE succeeds in receiving PDCCH#1 and PDSCH#1, fails to receive PDCCH#2, and transmits a HARQ-ACK without SR (negative SR) using PF0, the UE transmits 1 (ACK) as the 1-bit HARQ-ACK for PDSCH#1 by the 1-bit HARQ-ACK. Since the NW assumes that it receives a 2-bit HARQ-ACK, it interprets the actually received 1 (ACK) of the 1-bit HARQ-ACK as {1, 1} (ACK, ACK) of the 2-bit HARQ-ACK based on the first mapping. Therefore, the reception failure of PDCCH2 is not correctly notified.

[0074] When the UE successfully receives PDCCH#1, fails to receive PDSCH#1 and PDCCH#2, and transmits a HARQ-ACK with SR (positive SR) using PF0, the UE transmits 0 (NACK) as the 1-bit HARQ-ACK for PDSCH#1 by means of a 1-bit HARQ-ACK. Since the NW assumes that it receives a 2-bit HARQ-ACK, it interprets the 0 (NACK) of the 1-bit HARQ-ACK with SR actually received as {0, 1} (NACK, ACK) of the 2-bit HARQ-ACK without SR based on the first mapping. Therefore, the reception failure of PDCCH#2 is not correctly notified.

[0075] Note that when the UE is configured to use a semi-static HARQ-ACK codebook, even if the UE fails to detect PDCCH#1 and / or #2, the UE can tell which PDCCH detection has failed, so the UE transmits a 2-bit HARQ-ACK. Therefore, the NW can correctly recognize the 2-bit HARQ-ACK.

[0076] If the UE fails to detect both PDCCH#1 and #2 and no SR occurs, the UE does not transmit the PUCCH. In this case, the NW detects DTX (Discontinuous Transmission). Therefore, the NW can correctly recognize DTX. If the UE fails to detect both PDCCH#1 and #2 and SR occurs, the UE transmits SR and DTX using the signal constellation corresponding to the SR and NACK of PF1 or the CS corresponding to the SR of PF0. Therefore, the NW can correctly recognize SR and DTX.

[0077] Thus, problems occur when the UE notifies HARQ-ACK for two PDCCHs arranged in the time direction using the first mapping. Therefore, the inventors studied the method of notifying HARQ-ACK and arrived at the present invention.

[0078] Hereinafter, the present embodiment will be described in detail. The embodiments described below may be applied alone or in combination.

[0079] In the following description, when the UE detects one PDCCH from one frequency domain (serving cell and / or CC), it may be read as if the HARQ-ACK is obtained from one PDSCH having one MIMO (Multiple-Input and Multiple-Output) layer (spatial layer) scheduled by one PDCCH. When the UE detects two PDCCHs from two frequency domains (serving cell and / or CC), it may be read as if the HARQ-ACK is obtained from a PDSCH having two MIMO layers scheduled by one PDCCH.

[0080] Also, the two operations of the UE and the NW may be reversed. That is, in the case where it is stated that the UE uses a PUCCH format (PF0 or PF1) for UCI up to 2 bits, the UE may use a PUCCH format (PF2, PF3, or PF4) for UCI more than 2 bits, and in the case where it is stated that the UE uses a PUCCH format (PF2, PF3, or PF4) for UCI more than 2 bits, the UE may use a PUCCH format (PF0 or PF1) for UCI up to 2 bits.

[0081] For the UE to use a PUCCH format for UCI up to 2 bits may be to select (determine) a PUCCH resource from PUCCH resource set #0. For the UE to use a PUCCH format for UCI more than 2 bits may be to select (determine) a PUCCH resource from PUCCH resource sets #1-3.

[0082] (First aspect) In the first aspect, when the UE transmits HARQ-ACK up to 2 bits, the UE uses a PUCCH format and / or a PUCCH resource set suitable for the situation (PUCCH format determination method).

[0083] <Aspect 1-1> The UE may determine the PUCCH format for HARQ-ACK transmission based on whether it uses a dynamic HARQ-ACK codebook and / or whether it has detected one PDCCH from one frequency domain (serving cell and / or CC).

[0084] UE operation may vary depending on whether the UE is configured to use a semi-static HARQ-ACK codebook or not.

[0085] 《When the UE is configured to use a semi-static HARQ-ACK codebook》 When the UE is configured to use a semi-static HARQ-ACK codebook, the UE may use a PUCCH format (PF0 or PF1) for UCI up to 2 bits (1 bit or 2 bits). In this case, regardless of whether the UE has detected one PDCCH from one frequency domain (serving cell and / or CC), the UE may use the PUCCH format for UCI up to 2 bits. The PUCCH format for UCI up to 2 bits may be a PUCCH resource set up to 2 bits or may be PUCCH resource set #0.

[0086] According to this PUCCH format determination method, for example, even if the NW transmits PDCCH #1 and #2 in the time direction, the UE successfully detects PDCCH #1 and fails to detect PDCCH #2, the NW can correctly recognize the 2-bit HARQ-ACK because the UE transmits 2-bit HARQ-ACK.

[0087] 《When the UE is configured to use a dynamic HARQ-ACK codebook》 When the UE is configured to use the dynamic HARQ-ACK codebook, the UE may determine different PUCCH formats depending on whether it detects one PDCCH from one frequency region (serving cell and / or CC).

[0088] When the UE is configured to use the dynamic HARQ-ACK codebook and detects two PDCCHs from two frequency regions (serving cell and / or CC), the UE may use a PUCCH format (PF0 or PF1) for UCI up to 2 bits.

[0089] When the UE is configured to use the dynamic HARQ-ACK codebook and detects one PDCCH from one frequency region (serving cell and / or CC), the UE may use a PUCCH format (PF2, PF3, or PF4) for UCI more than 2 bits.

[0090] When the NW transmits PDCCH #1 and #2 in the time direction, the NW may recognize the PUCCH format of the detected PUCCH by performing blind detection of the PUCCH. When the detected PUCCH is PF0 or PF1, the NW may assume that the PUCCH contains 2-bit HARQ-ACK, and when the detected PUCCH is PF2, PF3, or PF4, the NW may assume that the PUCCH contains 1-bit HARQ-ACK.

[0091] According to this PUCCH format determination method, even when the UE fails to detect the PDCCH and transmits 1-bit HARQ-ACK instead of 2-bit HARQ-ACK that should be transmitted, the NW can avoid misrecognizing the HARQ-ACK.

[0092] For example, if the UE is configured to use a dynamic HARQ-ACK codebook, and the NW transmits PDCCH #1 and #2 in the time direction, and the UE successfully detects PDCCH #1 and fails to detect PDCCH #2, the UE transmits a PUCCH including 1-bit HARQ-ACK using PF2, PF3, or PF4. Since the received PUCCH is PF2, PF3, or PF4, the NW can recognize that the PUCCH indicates 1-bit HARQ-ACK and can recognize that the reception of one of PDSCH #1 scheduled by PDCCH #1 and PDSCH #2 scheduled by PDCCH #2 has failed.

[0093] <Aspect 1-2> The UE may determine the PUCCH format for HARQ-ACK transmission based on whether it has detected one PDCCH from one frequency domain (serving cell and / or CC). In this case, the UE may perform the same operation regardless of whether it uses a dynamic HARQ-ACK codebook.

[0094] The UE may determine different PUCCH formats depending on whether it has detected one PDCCH from one frequency domain (serving cell and / or CC).

[0095] If the UE has detected two PDCCHs from two frequency domains (serving cell and / or CC), the UE may use a PUCCH format (PF0 or PF1) for UCI up to 2 bits.

[0096] If the UE has detected one PDCCH from one frequency domain (serving cell and / or CC), the UE may use a PUCCH format (PF2, PF3, or PF4) for UCI more than 2 bits.

[0097] When the NW transmits PDCCH#1 and #2 in the time direction, it may recognize the PUCCH format of the detected PUCCH by performing blind detection of the PUCCH. When the detected PUCCH is PF0 or PF1, the NW may assume that the PUCCH contains 2-bit HARQ-ACK, and when the detected PUCCH is PF2, PF3, or PF4, the NW may assume that the PUCCH contains 1-bit HARQ-ACK.

[0098] According to this PUCCH format determination method, even if the UE fails to detect the PDCCH and transmits 1-bit HARQ-ACK instead of 2-bit HARQ-ACK, the NW can avoid misrecognizing the HARQ-ACK.

[0099] For example, when the NW transmits PDCCH#1 and #2 in the time direction, and the UE successfully detects PDCCH#1 and fails to detect PDCCH#2, the UE transmits a PUCCH containing 1-bit HARQ-ACK using PF2, PF3, or PF4. Since the received PUCCH is PF2, PF3, or PF4, the NW can recognize that the PUCCH indicates 1-bit HARQ-ACK and can recognize that the reception of one of PDSCH#1 scheduled by PDCCH#1 and PDSCH#2 scheduled by PDCCH#2 has failed.

[0100] <Aspect 1-3> The UE may determine the PUCCH format based on whether to use a dynamic HARQ-ACK codebook.

[0101] When the UE is configured to use a quasi-static HARQ-ACK codebook, the UE may use a PUCCH format (PF0 or PF1) for UCI up to 2 bits.

[0102] According to this PUCCH format determination method, for example, even if the NW transmits PDCCH#1 and #2 in the time direction and the UE successfully detects PDCCH#1 but fails to detect PDCCH#2, since the UE transmits 2-bit HARQ-ACK, the NW can correctly recognize the 2-bit HARQ-ACK.

[0103] When the UE is configured to use the dynamic HARQ-ACK codebook, the UE may use a PUCCH format (PF2, PF3, or PF4) for UCI more than 2 bits.

[0104] When the NW transmits PDCCH#1 and #2 in the time direction, the NW may recognize the PUCCH format of the detected PUCCH by performing blind detection of the PUCCH. When the detected PUCCH is PF0 or PF1, the NW may assume that the PUCCH contains 2-bit HARQ-ACK, and when the detected PUCCH is PF2, PF3, or PF4, the NW may assume that the PUCCH contains 1-bit HARQ-ACK.

[0105] According to this PUCCH format determination method, even if the UE fails to detect the PDCCH and transmits 1-bit HARQ-ACK instead of 2-bit HARQ-ACK when it should, the NW can avoid misrecognizing the HARQ-ACK.

[0106] For example, when the UE is configured to use the dynamic HARQ-ACK codebook, the NW transmits PDCCH#1 and #2 in the time direction, and the UE successfully detects PDCCH#1 but fails to detect PDCCH#2, the UE transmits a PUCCH containing 1-bit HARQ-ACK using PF2, PF3, or PF4. Since the received PUCCH is PF2, PF3, or PF4, the NW can recognize that the PUCCH indicates 1-bit HARQ-ACK and can recognize that the reception of one of PDSCH#1 scheduled by PDCCH#1 and PDSCH#2 scheduled by PDCCH#2 has failed.

[0107] (Second aspect) In the second aspect, a second mapping different from the first mapping is used.

[0108] <Aspect 2-1> In aspect 2-1, the second mapping for PF0 will be described.

[0109] As shown in FIGS. 7A and 8A, similar to the first mapping, in PF0, for 1-bit HARQ-ACK values 0 and 1, cyclic shifts 0 and 6 may be respectively associated (mapped).

[0110] As shown in FIGS. 7B and 8B, in PF0, for 2-bit HARQ-ACK values {0, 0}, {0, 1}, {1, 0}, {1, 1}, cyclic shifts 0, 3, 6, 9 may be respectively associated.

[0111] Here, it suffices that the 1-bit HARQ-ACK value 0 and the 2-bit HARQ-ACK value {0, 0} are associated with the same cyclic shift, and that the 1-bit HARQ-ACK value 1 and the 2-bit HARQ-ACK value {1, 0} are associated with the same cyclic shift. Note that in PF0, for 2-bit HARQ-ACK values {0, 0}, {0, 1}, {1, 0}, {1, 1}, cyclic shifts 0, 9, 6, 3 may be respectively associated.

[0112] As shown in FIGS. 7C and 8A, in PF0, for the values 0 and 1 of 1-bit HARQ-ACK with positive SR, cyclic shifts 1 and 7 may be respectively associated.

[0113] As shown in FIGS. 7D and 8B, in PF0, for 2-bit HARQ-ACK values {0, 0}, {0, 1}, {1, 0}, {1, 1} with positive SR, cyclic shifts 1, 4, 7, 10 may be respectively associated.

[0114] It is only necessary that the 1-bit HARQ-ACK value 0 with positive SR and the 2-bit HARQ-ACK value {0, 0} are associated with the same cyclic shift, and that the 1-bit HARQ-ACK value 1 with positive SR and the 2-bit HARQ-ACK value {1, 0} are associated with the same cyclic shift. Note that in PF0, for the 2-bit HARQ-ACK values {0, 0}, {0, 1}, {1, 0}, {1, 1} with positive SR, cyclic shifts 1, 10, 7, 4 may be respectively associated.

[0115] According to this mapping, even when the UE fails to detect the PDCCH and sends a 1-bit HARQ-ACK instead of a 2-bit HARQ-ACK that should be sent, the NW can avoid misrecognizing the received HARQ-ACK.

[0116] For example, even when the NW transmits PDCCH#1 and #2 in the time direction, the UE successfully detects PDCCH#1 and fails to detect PDCCH#2, and sends a 1-bit HARQ-ACK value (0 or 1) obtained from PDSCH#1 scheduled by PDCCH#1, the NW can correctly recognize the reception failure of PDSCH#2 because it recognizes it as a 2-bit HARQ-ACK value ({0, 0} or {1, 0}).

[0117] <Aspect 2-2> In Aspect 2-2, the second mapping for PF1 will be described.

[0118] For PF1, for the 1-bit and 2-bit bits b(i) indicating UCI (HARQ-ACK), the complex-valued modulation symbol x may be associated (mapped) as follows.

[0119] For 0 and 1 which are 1-bit values b(0), two complex-valued modulation symbols x, namely (1 + j) / sqrt(2) and (-1 - j) / sqrt(2), are respectively associated therewith. For PF1, for {0, 0}, {0, 1}, {1, 0}, {1, 1} which are 2-bit values {b(0), b(1)}, four complex-valued modulation symbols x, namely (1 + j) / sqrt(2), (1 - j) / sqrt(2), (-1 + j) / sqrt(2), and (-1 - j) / sqrt(2), may be respectively associated therewith.

[0120] Here, it is only necessary that the 1-bit value 0 and the 2-bit value {0, 0} are associated with the same complex-valued modulation symbol, and that the 1-bit value 1 and the 2-bit value {1, 0} are associated with the same complex-valued modulation symbol. Therefore, the two complex-valued modulation symbols respectively associated with the 2-bit values {0, 1} and {1, 1} may be the reverse of the above.

[0121] According to this mapping, even when the UE fails to detect the PDCCH and should transmit a 2-bit HARQ-ACK but transmits a 1-bit HARQ-ACK instead, the NW can avoid misrecognizing the received HARQ-ACK.

[0122] For example, even when the NW transmits PDCCH#1 and #2 in the time direction, the UE successfully detects PDCCH#1 and fails to detect PDCCH#2, and transmits a 1-bit HARQ-ACK value (0 or 1) obtained from PDSCH#1 scheduled by PDCCH#1, the NW can correctly recognize the reception failure of PDSCH#2 because it recognizes it as a 2-bit HARQ-ACK value ({0, 0} or {1, 0}).

[0123] According to the second aspect, when the UE fails to detect PDCCH#1 and fails to detect PDCCH#2, the UE does not transmit a PUCCH including HARQ-ACK. The NW assumes the reception of a 2-bit HARQ-ACK and can correctly recognize the 2-bit HARQ-ACK {0, 0} by detecting DTX.

[0124] According to this second aspect, when the UE fails to detect PDCCH#1 and successfully detects PDCCH#2, the UE transmits a PUCCH including a 2-bit HARQ-ACK ({0, 0} or {0, 1}) to recognize the detection failure of PDCCH#1. The NW assumes the reception of the 2-bit HARQ-ACK and can correctly recognize the reception failure of PDSCH#2 scheduled by PDCCH#2 by receiving the PUCCH.

[0125] According to this second aspect, when the UE successfully detects PDCCH#1 and fails to detect PDCCH#2, the UE transmits a PUCCH including a 1-bit HARQ-ACK (0 or 1) for PDSCH#2 scheduled by PUCCH#2. The NW assumes the reception of the 2-bit HARQ-ACK and can correctly recognize the reception failure of PDSCH#2 by recognizing the PUCCH as a 2-bit HARQ-ACK ({0, 0} or {1, 0}).

[0126] According to this second aspect, when the UE successfully detects PDCCH#1 and successfully detects PDCCH#2, the UE transmits a PUCCH including a 2-bit HARQ-ACK. The NW assumes the reception of the 2-bit HARQ-ACK and can correctly recognize the 2-bit HARQ-ACK.

[0127] (The third aspect) In the third aspect, a third mapping different from the first mapping is used. The third mapping for PF0 will be described.

[0128] As shown in FIGS. 9A and 10A, similar to the first mapping, for PF0, cyclic shifts 0 and 6 may be respectively associated (mapped) with 1-bit HARQ-ACK values 0 and 1.

[0129] As shown in FIGS. 9B and 10B, similar to the first mapping, for PF0, cyclic shifts 0, 3, 6, 9 may be respectively associated with 2-bit HARQ-ACK values {0, 0}, {0, 1}, {1, 1}, {1, 0}.

[0130] As shown in FIGS. 9C and 10A, for PF0, cyclic shifts 1, 7 may be respectively associated with 1-bit HARQ-ACK values 0, 1 with positive SR.

[0131] As shown in FIGS. 9D and 10B, similar to the first mapping, for PF0, cyclic shifts 1, 4, 7, 10 may be respectively associated with 2-bit HARQ-ACK values {0, 0}, {0, 1}, {1, 1}, {1, 0} with positive SR.

[0132] 0 of the 1-bit HARQ-ACK value with positive SR and {0, 0} of the 2-bit HARQ-ACK value with positive SR are associated with the same cyclic shift. 1 of the 1-bit HARQ-ACK value and {1, 1} of the 2-bit HARQ-ACK value are associated with the same cyclic shift.

[0133] According to the third mapping, changes from the first mapping can be minimized. Also, the difference between the cyclic shift associated with the 1-bit HARQ-ACK value with positive SR and the cyclic shift associated with the 2-bit HARQ-ACK value with positive SR can be suppressed, simplifying UE operation and suppressing the UE's load.

[0134] (Fourth aspect) In the fourth aspect, when the UE transmits HARQ-ACK up to 2 bits, it uses a mapping of UCI and a cyclic shift or complex-valued modulation symbol suitable for the situation (mapping determination method).

[0135] <Aspect 4-1> The UE may determine the mapping based on whether it uses a dynamic HARQ-ACK codebook and / or whether it has detected one PDCCH from one frequency domain (serving cell and / or CC).

[0136] UE operation may vary depending on whether the UE is configured to use a semi-static HARQ-ACK codebook or not.

[0137] 《When the UE is configured to use a semi-static HARQ-ACK codebook》 When the UE is configured to use a semi-static HARQ-ACK codebook, the UE may transmit a PUCCH of PUCCH format (PF0 or PF1) for UCI up to 2 bits (1 bit or 2 bits) using the third mapping. In this case, regardless of whether the UE has detected one PDCCH from one frequency domain (serving cell and / or CC), the UE may use the third mapping. The PUCCH format for UCI up to 2 bits may be a PUCCH resource set up to 2 bits or PUCCH resource set #0.

[0138] According to this mapping determination method, for example, even if the NW transmits PDCCH #1 and #2 in the time direction, the UE successfully detects PDCCH #1 and fails to detect PDCCH #2, the NW can correctly recognize the 2-bit HARQ-ACK because the UE transmits a 2-bit HARQ-ACK.

[0139] 《When the UE is configured to use a dynamic HARQ-ACK codebook》 When the UE is configured to use a dynamic HARQ-ACK codebook, the UE may determine different mappings depending on whether it has detected one PDCCH from one frequency domain (serving cell and / or CC).

[0140] If the UE is configured to use the dynamic HARQ-ACK codebook and detects two PDCCHs from two frequency regions (serving cell and / or CC), the UE may transmit a PUCCH of PUCCH format (PF0 or PF1) for UCI up to 2 bits using the third mapping.

[0141] If the UE is configured to use the dynamic HARQ-ACK codebook and detects one PDCCH from one frequency region (serving cell and / or CC), the UE may transmit a PUCCH of PUCCH format (PF0 or PF1) for UCI up to 2 bits using the second mapping.

[0142] According to this mapping determination method, even if the UE fails to detect the PDCCH and transmits 1-bit HARQ-ACK instead of 2-bit HARQ-ACK as should be, the NW can be prevented from misrecognizing the HARQ-ACK.

[0143] For example, if the UE is configured to use the dynamic HARQ-ACK codebook, the NW transmits PDCCH#1 and #2 in the time domain, the UE successfully detects PDCCH#1, and fails to detect PDCCH#2, the UE transmits a PUCCH including 1-bit HARQ-ACK using the second mapping. The NW can interpret the received PUCCH as 2-bit HARQ-ACK and recognize that the reception of PDSCH#2 scheduled for PDCCH#2 has failed.

[0144] <Aspect 4-2> The UE may determine the mapping for HARQ-ACK transmission based on whether it has detected one PDCCH from one frequency region (serving cell and / or CC). In this case, the UE may perform the same operation regardless of whether it uses the dynamic HARQ-ACK codebook.

[0145] The UE may determine different mappings according to whether it detects one PDCCH from one frequency domain (serving cell and / or CC).

[0146] When the UE detects two PDCCHs from two frequency domains (serving cell and / or CC), the UE may transmit a PUCCH of a PUCCH format for UCI up to 2 bits using a third mapping. When the NW detects a PUCCH having a cyclic shift of the third mapping, the NW may interpret a 2-bit HARQ-ACK using the third mapping.

[0147] When the UE detects one PDCCH from one frequency domain (serving cell and / or CC), the UE may transmit a PUCCH of a PUCCH format for UCI up to 2 bits using a second mapping. When the NW detects a PUCCH having a cyclic shift of the second mapping, the NW may interpret a 1-bit HARQ-ACK using the second mapping.

[0148] According to this mapping determination method, even when the UE fails to detect the PDCCH and transmits a 1-bit HARQ-ACK instead of a 2-bit HARQ-ACK that should be transmitted, the NW can be prevented from misrecognizing the HARQ-ACK.

[0149] For example, even when the NW transmits PDCCH#1 and #2 in the time direction, the UE successfully detects PDCCH#1, fails to detect PDCCH#2, and transmits a 1-bit HARQ-ACK value (0 or 1) obtained from PDSCH#1 scheduled on PDCCH#1, the UE transmits a PUCCH including a 1-bit HARQ-ACK using the second mapping. Since the NW recognizes it as a 2-bit HARQ-ACK value ({0, 0} or {1, 0}), it can correctly recognize the reception failure of PDSCH#2.

[0150] <Aspect 4-3> The UE may determine the mapping based on whether to use the dynamic HARQ-ACK codebook.

[0151] If the UE is configured to use the semi-static HARQ-ACK codebook, the UE may transmit the PUCCH of PUCCH format (PF0 or PF1) for UCI up to 2 bits using the third mapping.

[0152] According to this mapping determination method, for example, even if the NW transmits PDCCH#1 and #2 in the time direction, and the UE successfully detects PDCCH#1 and fails to detect PDCCH#2, since the UE transmits 2-bit HARQ-ACK, the NW can correctly recognize the 2-bit HARQ-ACK.

[0153] If the UE is configured to use the dynamic HARQ-ACK codebook, the UE may transmit the PUCCH of PUCCH format (PF0 or PF1) for UCI up to 2 bits using the second mapping.

[0154] According to this mapping determination method, even if the UE should transmit 2-bit HARQ-ACK due to failing to detect the PDCCH but transmits 1-bit HARQ-ACK instead, the NW can be avoided from misrecognizing the HARQ-ACK.

[0155] For example, if the UE is configured to use the dynamic HARQ-ACK codebook, the NW transmits PDCCH#1 and #2 in the time direction, the UE successfully detects PDCCH#1 and fails to detect PDCCH#2, and transmits the 1-bit HARQ-ACK value (0 or 1) obtained from the PDSCH#1 scheduled by PDCCH#1, the NW can correctly recognize the reception failure of PDSCH#2 because it recognizes the 2-bit HARQ-ACK value ({0, 0} or {1, 0}).

[0156] <Aspect 4-4> When the UE transmits HARQ-ACK up to 2 bits, the second mapping may be used. In this case, regardless of whether the UE uses the dynamic HARQ-ACK codebook, regardless of whether one PDCCH is detected from one frequency domain (serving cell and / or CC), and regardless of from which PDCCH and / or PDSCH the HARQ-ACK is obtained, the UE may perform the same operation.

[0157] According to this mapping determination method, even when the UE fails to detect the PDCCH and transmits a 1-bit HARQ-ACK instead of a 2-bit HARQ-ACK that should be transmitted, the NW can avoid misrecognizing the HARQ-ACK.

[0158] For example, when the UE is configured to use the dynamic HARQ-ACK codebook, the NW transmits PDCCH#1 and #2 in the time direction, the UE successfully detects PDCCH#1 and fails to detect PDCCH#2, and transmits a 1-bit HARQ-ACK value (0 or 1) obtained from PDSCH#1 scheduled by PDCCH#1, the NW can correctly recognize the reception failure of PDSCH#2 because it recognizes a 2-bit HARQ-ACK value ({0, 0} or {1, 0}).

[0159] (The fifth aspect) In the fifth aspect, the total DAI included in the PDCCH that schedules the PDSCH indicates the number of at least one DL allocation arranged in the time direction and / or the frequency direction (PDCCH identification method).

[0160] The counter DAI may indicate the number (index) of at least one DL allocation arranged in the time direction and / or the frequency direction.

[0161] In this case, when two PDCCHs are transmitted in the time direction, in PDCCH#1, the total DAI indicates 2 and the counter DAI indicates 1, and in PDCCH#2, the total DAI indicates 1 and the counter DAI indicates 2. When one PDCCH is transmitted in the time direction, in PDCCH#1, the total DAI indicates 1 and the counter DAI indicates 1.

[0162] When the UE is configured to use the dynamic HARQ-ACK codebook, the UE may identify the detected PDCCH using the total DAI and the counter DAI included in the PDCCH. When the UE detects at least one PDCCH, the UE may transmit a PUCCH including 2-bit HARQ-ACK based on the total DAI within the PDCCH.

[0163] If the UE fails to detect PDCCH#1 and successfully detects PDCCH#2, since the total DAI included in the detected PDCCH#2 is 2 and the counter DAI is 2, the UE can recognize the detection failure of PDCCH#1 and the detection success of PDCCH#2. The UE transmits 2-bit HARQ-ACK based on the decoding result of PDSCH#2.

[0164] If the UE successfully detects PDCCH#1 and fails to detect PDCCH#2, since the total DAI included in the detected PDCCH#1 is 2 and the counter DAI is 1, the UE can recognize the detection success of PDCCH#1 and the detection failure of PDCCH#2. The UE transmits 2-bit HARQ-ACK based on the decoding result of PDSCH#1.

[0165] According to the fifth aspect, for example, even when the NW transmits PDCCH#1 and #2 in the time direction and the UE successfully detects PDCCH#1 and fails to detect PDCCH#2, when the UE transmits 2-bit HARQ-ACK based on the total DAI, the NW can correctly recognize the 2-bit HARQ-ACK.

[0166] (Sixth aspect) In the sixth aspect, the UE uses a PUCCH format and / or a PUCCH resource set suitable for the number of MIMO layers (PUCCH format determination method).

[0167] In NR, since one CW (Code Word) and / or TB (Transport Block) is transmitted by up to 4 MIMO layers, when the number of MIMO layers is 1 to 4, the UE may transmit 1-bit HARQ-ACK, and when the number of MIMO layers is 5 to 8, the UE may transmit 2-bit HARQ-ACK.

[0168] When the number of CWs and / or TBs of the PDSCH scheduled by one DL assignment (one PDCCH) detected by the UE is 1 (when 1-bit HARQ-ACK can be obtained in the MIMO layer direction based on one PDCCH), the UE may use a PUCCH format (PF0 or PF1) for UCI up to 2 bits.

[0169] When the number of CWs and / or TBs of the PDSCH scheduled by one DL assignment (one PDCCH) detected by the UE is 2 (when 2-bit HARQ-ACK can be obtained in the MIMO layer direction based on one PDCCH), the UE may use a PUCCH format (PF0 or PF1) for UCI up to 2 bits.

[0170] When the number of CWs and / or TBs of the PDSCH scheduled by each of the two DL assignments (two PDCCHs) detected by the UE is 1 (when 1-bit HARQ-ACK can be obtained in the MIMO layer direction based on each of the two PDCCHs, and 2-bit HARQ-ACK can be obtained in total), the UE may use a PUCCH format (PF2, PF3, or PF4) for UCI more than 2 bits.

[0171] In this case, if the UE successfully detects both PDCCHs, it transmits PF0 or PF1, and if it fails to detect one of the PDCCHs, it transmits PF2, PF3, or PF4. The NW can recognize the UE's PDCCH detection by blindly detecting two patterns of PUCCH.

[0172] If the number of CWs and / or TBs of the PDSCH scheduled by at least one of the two DL allocations (two PDCCHs) detected by the UE is 2 (when 2-bit HARQ-ACK in the MIMO layer direction is obtained based on at least one of the two PDCCHs and a total of more than 2 bits (3 bits or more) of HARQ-ACK is obtained), the UE may use a PUCCH format (PF2, PF3, or PF4) for UCI more than 2 bits.

[0173] Note that when the UE transmits 2-bit HARQ-ACK based on two CWs and / or TBs, the UE may use a PUCCH format (PF0 or PF1) for UCI up to 2 bits. When the UE transmits 1-bit HARQ-ACK based on one CW and / or TB, the UE may use a PUCCH format (PF2, PF3, or PF4) for UCI more than 2 bits.

[0174] If the UE is configured to use the dynamic HARQ-ACK codebook, detects one PDCCH from one frequency domain (serving cell and / or CC), and the number of CWs and / or TBs of the PDSCH scheduled by each of the two DL allocations (two PDCCHs) detected by the UE is 1 (when 1-bit HARQ-ACK in the MIMO layer direction is obtained based on each of the two PDCCHs and a total of 2-bit HARQ-ACK is obtained), the UE may use a PUCCH format (PF2, PF3, or PF4) for UCI more than 2 bits.

[0175] Note that instead of using a PUCCH format for UCI with more than 2 bits, the UE may use a second mapping and a PUCCH format (PF0 or PF1) for UCI up to 2 bits. Also, instead of using a PUCCH format (PF0 or PF1) for UCI up to 2 bits, the UE may use a third mapping and a PUCCH format (PF0 or PF1) for UCI up to 2 bits.

[0176] When the UE transmits 2-bit HARQ-ACK in the MIMO layer (spatial layer) direction, the UE may use a PUCCH format (PF0 or PF1) for UCI up to 2 bits. When the UE transmits 1-bit HARQ-ACK in the MIMO layer (spatial layer) direction, the UE may use a PUCCH format (PF2, PF3, or PF4) for UCI with more than 2 bits.

[0177] According to this PUCCH format determination method, even when the UE fails to detect the PDCCH and transmits a 1-bit HARQ-ACK instead of a 2-bit HARQ-ACK that should be transmitted, the NW can be prevented from misrecognizing the HARQ-ACK.

[0178] For example, if the UE is configured to use a dynamic HARQ-ACK codebook, the NW transmits PDCCH#1 and #2 in the time direction, the UE successfully detects PDCCH#1, and fails to detect PDCCH#2, the UE transmits a PUCCH including 1-bit HARQ-ACK using PF2, PF3, or PF4. Since the received PUCCH is PF2, PF3, or PF4, the NW can recognize that the PUCCH indicates 1-bit HARQ-ACK and can recognize that the reception of one of PDSCH#1 scheduled by PDCCH#1 and PDSCH#2 scheduled by PDCCH#2 has failed.

[0179] (Wireless communication system) Hereinafter, the configuration of a wireless communication system according to an embodiment of the present invention will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present invention.

[0180] FIG. 11 is a diagram showing an example of the schematic configuration of a wireless communication system according to an embodiment of the present invention. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) that integrates a plurality of basic frequency blocks (component carriers) with the system bandwidth (for example, 20 MHz) of the LTE system as one unit can be applied.

[0181] Note that the wireless communication system 1 may be referred to as LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or may be referred to as a system that realizes these.

[0182] The wireless communication system 1 includes a radio base station 11 that forms a macro cell C1 with a relatively wide coverage, and radio base stations 12 (12a - 12c) that are arranged within the macro cell C1 and form a small cell C2 that is narrower than the macro cell C1. Also, user terminals 20 are arranged in the macro cell C1 and each small cell C2. The arrangement, number, etc. of each cell and the user terminal 20 are not limited to those shown in the figure.

[0183] The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. The user terminal 20 is assumed to simultaneously use the macro cell C1 and the small cell C2 by means of CA or DC. Also, the user terminal 20 may apply CA or DC using a plurality of cells (CCs) (for example, 5 or fewer CCs, 6 or more CCs).

[0184] Communication can be performed between the user terminal 20 and the radio base station 11 using a carrier with a narrow bandwidth (for example, 2 GHz) in a relatively low frequency band (also called an existing carrier or a legacy carrier). On the other hand, between the user terminal 20 and the radio base station 12, a carrier with a wide bandwidth may be used in a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.), or the same carrier as that between the user terminal 20 and the radio base station 11 may be used. Note that the configuration of the frequency band used by each radio base station is not limited to this.

[0185] The radio base station 11 and the radio base station 12 (or between two radio base stations 12) may be configured to be connected by a wired connection (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.) or a wireless connection.

[0186] The radio base station 11 and each radio base station 12 are each connected to the upper-level station device 30 and are connected to the core network 40 via the upper-level station device 30. Note that the upper-level station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), etc., but is not limited thereto. Also, each radio base station 12 may be connected to the upper-level station device 30 via the radio base station 11.

[0187] Note that the radio base station 11 is a radio base station having a relatively wide coverage area, and may be referred to as a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. Also, the radio base station 12 is a radio base station having a local coverage area, and may be referred to as a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), a transmission / reception point, or the like. Hereinafter, when the radio base stations 11 and 12 are not distinguished, they are collectively referred to as the radio base station 10.

[0188] Each user terminal 20 is a terminal compatible with various communication systems such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

[0189] In the wireless communication system 1, as a wireless access method, orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier - frequency division multiple access (SC-FDMA) and / or OFDMA is applied to the uplink.

[0190] OFDMA is a multi-carrier transmission method that divides a frequency band into a plurality of narrow frequency bands (sub-carriers), maps data to each sub-carrier, and performs communication. SC-FDMA is a single carrier transmission method that divides the system bandwidth into one or a continuous resource block for each terminal, and reduces interference between terminals by having a plurality of terminals use different bands. Note that the uplink and downlink wireless access methods are not limited to these combinations, and other wireless access methods may be used.

[0191] In the wireless communication system 1, as downlink channels, a physical downlink shared channel (PDSCH) shared by each user terminal 20, a physical broadcast channel (PBCH), a downlink L1 / L2 control channel, etc. are used. User data, upper layer control information, a system information block (SIB), etc. are transmitted through the PDSCH. Also, a master information block (MIB) is transmitted through the PBCH.

[0192] The downlink L1 / L2 control channel includes a physical downlink control channel (PDCCH), an enhanced physical downlink control channel (EPDCCH), a physical control format indicator channel (PCFICH), a physical hybrid-ARQ indicator channel (PHICH), etc. Downlink control information (DCI) including scheduling information for the PDSCH and / or PUSCH is transmitted through the PDCCH.

[0193] Note that scheduling information may be notified by the DCI. For example, the DCI for scheduling DL data reception may be called a DL assignment, and the DCI for scheduling UL data transmission may be called a UL grant.

[0194] The number of OFDM symbols used for the PDCCH is transmitted through the PCFICH. Delivery confirmation information for HARQ (Hybrid Automatic Repeat reQuest) for the PUSCH (for example, also referred to as retransmission control information, HARQ-ACK, ACK / NACK, etc.) is transmitted through the PHICH. The EPDCCH is frequency-division multiplexed with the PDSCH (downlink shared data channel) and is used for transmission of DCI and the like in the same way as the PDCCH.

[0195] In the wireless communication system 1, as the uplink channels, an uplink shared channel (PUSCH: Physical Uplink Shared Channel), an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel), etc., which are shared by each user terminal 20, are used. User data, upper layer control information, etc. are transmitted by the PUSCH. Also, downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, a scheduling request (SR: Scheduling Request), etc. are transmitted by the PUCCH. A random access preamble for connection establishment with the cell is transmitted by the PRACH.

[0196] In the wireless communication system 1, as downlink reference signals, a cell-specific reference signal (CRS: Cell-specific Reference Signal), a channel state information reference signal (CSI-RS: Channel State Information-Reference Signal), a demodulation reference signal (DMRS: DeModulation Reference Signal), a positioning reference signal (PRS: Positioning Reference Signal), etc. are transmitted. Also, in the wireless communication system 1, as uplink reference signals, a sounding reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), etc. are transmitted. Note that the DMRS may also be called a user terminal-specific reference signal (UE-specific Reference Signal). Also, the transmitted reference signals are not limited to these.

[0197] <Base Station FIG. 12 is a diagram showing an example of the overall configuration of a radio base station according to an embodiment of the present invention. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmission / reception antennas 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.

[0198] User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the upper station device 30 to the baseband signal processing unit 104 via the transmission path interface 106.

[0199] In the baseband signal processing unit 104, with respect to user data, processing of the PDCP (Packet Data Convergence Protocol) layer, splitting / merging of user data, transmission processing of the RLC (Radio Link Control) layer such as RLC retransmission control, MAC (Medium Access Control) retransmission control (for example, transmission processing of HARQ), scheduling, transmission format selection, channel encoding, inverse fast Fourier transform (IFFT) processing, precoding processing, and other transmission processing are performed and transferred to the transmission / reception unit 103. Also, with respect to the downlink control signal, transmission processing such as channel encoding and inverse fast Fourier transform is performed and transferred to the transmission / reception unit 103.

[0200] The transmission / reception unit 103 converts the baseband signal pre-coded for each antenna from the baseband signal processing unit 104 into a radio frequency band and transmits it. The radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101. The transmission / reception unit 103 can be composed of a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on the common knowledge in the technical field related to the present invention. Note that the transmission / reception unit 103 may be configured as an integrated transmission / reception unit or may be composed of a transmission unit and a reception unit.

[0201] On the other hand, for the uplink signal, the radio frequency signal received by the transceiver antenna 101 is amplified by the amplifier unit 102. The transceiver unit 103 receives the uplink signal amplified by the amplifier unit 102. The transceiver unit 103 frequency-converts the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.

[0202] In the baseband signal processing unit 104, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing, error correction decoding, reception processing of MAC retransmission control, and reception processing of the RLC layer and PDCP layer are performed on the user data included in the input uplink signal, and the data is transferred to the upper-level station device 30 via the transmission path interface 106. The call processing unit 105 performs call processing (such as setting and releasing) of the communication channel, state management of the radio base station 10, management of radio resources, and the like.

[0203] The transmission path interface 106 transmits and receives signals to and from the upper-level station device 30 via a predetermined interface. Further, the transmission path interface 106 may transmit and receive signals (backhaul signaling) to and from another radio base station 10 via a base station interface (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface).

[0204] FIG. 13 is a diagram showing an example of the functional configuration of a radio base station according to an embodiment of the present invention. In this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is assumed that the radio base station 10 also has other functional blocks necessary for wireless communication.

[0205] The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. Note that these components only need to be included in the radio base station 10, and some or all of the components do not necessarily need to be included in the baseband signal processing unit 104.

[0206] The control unit (scheduler) 301 controls the entire radio base station 10. The control unit 301 can be composed of a controller, a control circuit, or a control device described based on the common understanding in the technical field related to the present invention.

[0207] The control unit 301 controls, for example, the generation of signals by the transmission signal generation unit 302, the allocation of signals by the mapping unit 303, etc. Also, the control unit 301 controls the reception processing of signals by the reception signal processing unit 304, the measurement of signals by the measurement unit 305, etc.

[0208] The control unit 301 controls the scheduling (e.g., resource allocation) of system information, downlink data signals (e.g., signals transmitted by PDSCH), downlink control signals (e.g., signals transmitted by PDCCH and / or EPDCCH, delivery confirmation information, etc.). Also, the control unit 301 controls the generation of downlink control signals, downlink data signals, etc., based on the result of determining whether retransmission control is required for the uplink data signal. Further, the control unit 301 controls the scheduling of synchronization signals (e.g., PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), downlink reference signals (e.g., CRS, CSI-RS, DMRS), etc.

[0209] The control unit 301 controls the scheduling of uplink data signals (e.g., signals transmitted by PUSCH), uplink control signals (e.g., signals transmitted by PUCCH and / or PUSCH, delivery confirmation information, etc.), random access preambles (e.g., signals transmitted by PRACH), uplink reference signals, etc.

[0210] Further, the control unit 301 may determine the uplink control channel PUCCH format of the received uplink control channel (PUCCH).

[0211] The transmission signal generation unit 302 generates a downlink signal (such as a downlink control signal, a downlink data signal, a downlink reference signal, etc.) based on an instruction from the control unit 301 and outputs it to the mapping unit 303. The transmission signal generation unit 302 can be composed of a signal generator, a signal generation circuit, or a signal generation device described based on the common understanding in the technical field related to the present invention.

[0212] The transmission signal generation unit 302 generates, for example, a DL assignment for notifying downlink data allocation information and / or a UL grant for notifying uplink data allocation information based on an instruction from the control unit 301. Both the DL assignment and the UL grant are DCI and follow the DCI format. Further, the downlink data signal is subjected to encoding processing and modulation processing according to, for example, the coding rate, modulation method, etc. determined based on the channel state information (CSI: Channel State Information) from each user terminal 20.

[0213] The mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301 and outputs it to the transceiver unit 103. The mapping unit 303 can be composed of a mapper, a mapping circuit, or a mapping device described based on the common understanding in the technical field related to the present invention.

[0214] The received signal processing unit 304 performs reception processing (such as demapping, demodulation, decoding, etc.) on the received signal input from the transceiver unit 103. Here, the received signal is, for example, an uplink signal (such as an uplink control signal, an uplink data signal, an uplink reference signal, etc.) transmitted from the user terminal 20. The received signal processing unit 304 can be composed of a signal processor, a signal processing circuit, or a signal processing device described based on the common understanding in the technical field related to the present invention.

[0215] The receiving signal processing unit 304 outputs the information decoded by the receiving process to the control unit 301. For example, when receiving a PUCCH including HARQ-ACK, it outputs the HARQ-ACK to the control unit 301. Also, the receiving signal processing unit 304 outputs the received signal and / or the signal after the receiving process to the measuring unit 305.

[0216] The measuring unit 305 performs measurements on the received signal. The measuring unit 305 can be composed of a measuring instrument, a measuring circuit, or a measuring device described based on the common knowledge in the technical field related to the present invention.

[0217] For example, the measuring unit 305 may perform RRM (Radio Resource Management) measurements, CSI (Channel State Information) measurements, etc. based on the received signal. The measuring unit 305 may measure received power (e.g., RSRP (Reference Signal Received Power)), received quality (e.g., RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio)), signal strength (e.g., RSSI (Received Signal Strength Indicator)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 301.

[0218] <User terminal> FIG. 14 is a diagram showing an example of the overall configuration of a user terminal according to an embodiment of the present invention. The user terminal 20 includes a plurality of transceiver antennas 201, an amplifier unit 202, a transceiver unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the transceiver antennas 201, the amplifier unit 202, and the transceiver unit 203 may each be configured to include one or more.

[0219] The radio frequency signal received by the transceiver antenna 201 is amplified by the amplifier section 202. The transceiver section 203 receives the downlink signal amplified by the amplifier section 202. The transceiver section 203 frequency-converts the received signal into a baseband signal and outputs it to the baseband signal processing section 204. The transceiver section 203 can be composed of a transmitter / receiver, a transceiver circuit, or a transceiver device as described based on the common knowledge in the technical field to which the present invention pertains. Note that the transceiver section 203 may be configured as an integrated transceiver section or may be composed of a transmitter section and a receiver section.

[0220] The baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing of retransmission control, etc. on the input baseband signal. The downlink user data is transferred to the application section 205. The application section 205 performs processing related to layers higher than the physical layer and the MAC layer. Also, among the downlink data, broadcast information may also be transferred to the application section 205.

[0221] On the other hand, regarding the uplink user data, it is input from the application section 205 to the baseband signal processing section 204. In the baseband signal processing section 204, transmission processing of retransmission control (e.g., transmission processing of HARQ), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, etc. are performed and transferred to the transceiver section 203. The transceiver section 203 frequency-converts the baseband signal output from the baseband signal processing section 204 into a radio frequency band and transmits it. The radio frequency signal frequency-converted by the transceiver section 203 is amplified by the amplifier section 202 and transmitted from the transceiver antenna 201.

[0222] In addition, the transceiver unit 203 may receive at least one downlink control channel (PDCCH, DL allocation) and receive at least one downlink shared channel (PDSCH) scheduled on the downlink control channel. Further, the transceiver unit 203 may transmit an uplink control channel including a delivery confirmation signal (e.g., HARQ-ACK) based on at least one downlink shared channel.

[0223] FIG. 15 is a diagram showing an example of the functional configuration of a user terminal according to an embodiment of the present invention. In this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

[0224] The baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. Note that these configurations only need to be included in the user terminal 20, and a part or all of the configurations may not be included in the baseband signal processing unit 204.

[0225] The control unit 401 controls the entire user terminal 20. The control unit 401 can be composed of a controller, a control circuit, or a control device described based on the common knowledge in the technical field related to the present invention.

[0226] The control unit 401 controls, for example, the generation of signals by the transmission signal generation unit 402 and the allocation of signals by the mapping unit 403. Further, the control unit 401 controls the reception processing of signals by the reception signal processing unit 404 and the measurement of signals by the measurement unit 405.

[0227] The control unit 401 acquires the downlink control signal and the downlink data signal transmitted from the radio base station 10 from the reception signal processing unit 404. The control unit 401 controls the generation of the uplink control signal and / or the uplink data signal based on, for example, the result of determining whether retransmission control for the downlink control signal and / or the downlink data signal is necessary.

[0228] Further, the control unit 401 may control the transmission of an ACK / NACK signal using at least one of the following: whether it is set to use a dynamic ACK / NACK codebook (e.g., dynamic HARQ-ACK codebook) for the at least one downlink shared channel, the number of bits of the ACK / NACK signal based on the downlink shared channel, whether the at least one downlink allocation is transmitted by one frequency resource (e.g., a serving cell or CC), the number of codewords (and / or the number of transport blocks, or the number of MIMO layers) of the at least one downlink shared channel, the uplink control channel format (PUCCH format) associated with at least one of the above, and the mapping of the ACK / NACK signal (e.g., one of the first - third mappings).

[0229] Also, in the mapping (e.g., the second mapping), at least one of the cyclic shifts and complex - valued modulation symbols mapped to the value 0 of the 1 - bit ACK / NACK signal may be equal to at least one of the cyclic shifts and complex - valued modulation symbols mapped to (0,0) of the 2 - bit ACK / NACK signal, and at least one of the cyclic shifts and complex - valued modulation symbols mapped to the value 1 of the 1 - bit ACK / NACK signal may be equal to at least one of the cyclic shifts and complex - valued modulation symbols mapped to (1,0) of the 2 - bit ACK / NACK signal.

[0230] Also, in the mapping (e.g., the second mapping), at least one of the cyclic shifts and complex - valued modulation symbols mapped to the scheduling request and the value 0 of the 1 - bit ACK / NACK signal may be equal to at least one of the cyclic shifts and complex - valued modulation symbols mapped to the scheduling request and (0,0) of the 2 - bit ACK / NACK signal, and at least one of the cyclic shifts and complex - valued modulation symbols mapped to the scheduling request and the value 1 of the 1 - bit ACK / NACK signal may be equal to at least one of the cyclic shifts and complex - valued modulation symbols mapped to the scheduling request and (1,0) of the 2 - bit ACK / NACK signal.

[0231] Further, the control unit 401 may determine at least one of the uplink control channel format and the mapping based on at least one of whether it is set to use a dynamic delivery confirmation signal codebook for the at least one downlink shared channel, the number of bits of the delivery confirmation signal based on the downlink shared channel, whether the at least one downlink allocation is transmitted by one frequency resource, and the number of codewords (and / or the number of transport blocks, or the number of MIMO layers) of the at least one downlink shared channel.

[0232] Also, when at least one downlink allocation is a plurality of downlink control channels allocated to different time resources, the downlink allocation indicator (for example, total DAI) included in each of the plurality of downlink control channels may indicate the number of the plurality of downlink control channels.

[0233] The transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs it to the mapping unit 403. The transmission signal generation unit 402 can be composed of a signal generator, a signal generation circuit, or a signal generation device described based on the common knowledge in the technical field related to the present invention.

[0234] The transmission signal generation unit 402 generates, for example, an uplink control signal related to delivery confirmation information, channel state information (CSI), etc. based on an instruction from the control unit 401. Further, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, when the UL grant is included in the downlink control signal notified from the radio base station 10, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal.

[0235] Based on the instruction from the control unit 401, the mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to radio resources and outputs it to the transceiver unit 203. The mapping unit 403 can be composed of a mapper, a mapping circuit, or a mapping device described based on the common understanding in the technical field related to the present invention.

[0236] The received signal processing unit 404 performs reception processing (such as demapping, demodulation, decoding, etc.) on the received signal input from the transceiver unit 203. Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10. The received signal processing unit 404 can be composed of a signal processor, a signal processing circuit, or a signal processing device described based on the common understanding in the technical field related to the present invention. Also, the received signal processing unit 404 can constitute the receiving unit according to the present invention.

[0237] The received signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The received signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, etc. to the control unit 401. Also, the received signal processing unit 404 outputs the received signal and / or the signal after reception processing to the measurement unit 405.

[0238] The measurement unit 405 performs measurements on the received signal. The measurement unit 405 can be composed of a measuring instrument, a measurement circuit, or a measurement device described based on the common understanding in the technical field related to the present invention.

[0239] For example, the measurement unit 405 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 405 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 401.

[0240] <Hardware Configuration> Note that the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (components) can be realized by any combination of hardware and / or software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically and / or logically combined device, or two or more physically and / or logically separated devices may be directly and / or indirectly (e.g., using wired and / or wireless) connected, and realized using these multiple devices.

[0241] For example, a radio base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs the processing of the wireless communication method of the present invention. FIG. 16 is a diagram showing an example of the hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention. The above-described radio base station 10 and user terminal 20 may physically be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0242] Note that in the following description, the term "device" can be read as a circuit, a device, a unit, etc. The hardware configuration of the radio base station 10 and the user terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0243] For example, although only one processor 1001 is shown, there may be a plurality of processors. Also, the processing may be executed by one processor, or the processing may be executed by one or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

[0244] Each function in the radio base station 10 and the user terminal 20 is realized, for example, by causing a processor 1001 to load a predetermined software (program) onto hardware such as a memory 1002, so that the processor 1001 performs operations, controls communication via a communication device 1004, or controls reading and / or writing of data in the memory 1002 and a storage 1003.

[0245] The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be constituted by a central processing unit (CPU: Central Processing Unit) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the above-described baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized by the processor 1001.

[0246] Also, the processor 1001 reads a program (program code), software module, data, etc. from the storage 1003 and / or the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 401 of the user terminal 20 may be stored in the memory 1002 and realized by a control program operating in the processor 1001, and other functional blocks may be realized in the same manner.

[0247] The memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), and other suitable storage media. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. executable for implementing the wireless communication method according to an embodiment of the present invention.

[0248] The storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (e.g., a compact disc (such as a CD-ROM (Compact Disc ROM)), a digital versatile disc, a Blu-ray (registered trademark) disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. The storage 1003 may be referred to as an auxiliary storage device.

[0249] The communication device 1004 is hardware (a transceiver device) for performing communication between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement frequency division duplex (FDD) and / or time division duplex (TDD). For example, the above-described transceiver antenna 101(201), amplifier unit 102(202), transceiver unit 103(203), transmission line interface 106, etc. may be realized by the communication device 1004.

[0250] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0251] Also, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses for each device.

[0252] In addition, the radio base station 10 and the user terminal 20 may 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), and a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0253] (Modification example) In addition, for the terms described in this specification and / or the terms necessary for understanding this specification, they may be replaced with terms having the same or similar meanings. For example, a channel and / or a symbol may be a signal (signaling). Also, a signal may be a message. The reference signal may also be abbreviated as RS (Reference Signal) and may be called a pilot, a pilot signal, etc. depending on the applicable standard. Also, a component carrier (CC) may be called a cell, a frequency carrier, a carrier frequency, etc.

[0254] Also, the radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be called a subframe. Furthermore, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) that does not depend on the numerology.

[0255] Furthermore, a slot may be composed of one or more symbols (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. Also, a slot may be a time unit based on a numerology. Further, a slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, a mini-slot may be referred to as a sub-slot.

[0256] A radio frame, a sub-frame, a slot, a mini-slot, and a symbol all represent time units for signal transmission. Different names may be used for a radio frame, a sub-frame, a slot, a mini-slot, and a symbol respectively. For example, one sub-frame may be referred to as a transmission time interval (TTI), or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, a sub-frame and / or a TTI may be a sub-frame (1 ms) in existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing a TTI may be called a slot, a mini-slot, etc. instead of a sub-frame.

[0257] Here, a TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a radio base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in units of TTI. Note that the definition of a TTI is not limited to this.

[0258] The TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, and / or codewords, or may be a processing unit such as for scheduling and link adaptation. When the TTI is given, the time interval (e.g., the number of symbols) in which the transport block, code block, and / or codeword is actually mapped may be shorter than the TTI.

[0259] Note that when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0260] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8 - 12), normal TTI, long TTI, normal subframe, normal subframe, or long subframe, etc. A TTI shorter than the normal TTI may be called a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini-slot, or sub-slot, etc.

[0261] Note that the long TTI (e.g., normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, or the short TTI (e.g., shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and a TTI length of 1 ms or more.

[0262] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may include one or more consecutive subcarriers. Also, an RB may include one or more symbols in the time domain and may have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI or one subframe may be composed of one or more resource blocks. Note that one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0263] Also, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource area of one subcarrier and one symbol.

[0264] Note that the structures such as the above-described radio frame, subframe, slot, mini-slot, and symbol are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be changed in various ways.

[0265] Also, the information, parameters, etc. described in this specification may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by a predetermined index.

[0266] The names used for parameters and the like in this specification are not limiting names in any way. For example, various channels (such as PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable names, so the various names assigned to these various channels and information elements are not limiting names in any way.

[0267] The information, signals, etc. described in this specification may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0268] Also, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input and output via a plurality of network nodes.

[0269] The input and output information, signals, etc. may be stored in a specific location (e.g., 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 be deleted. The input information, signals, etc. may be transmitted to other devices.

[0270] The notification of information is not limited to the aspects / embodiments described in this specification, and other methods may be used. For example, the notification of information may be carried out by physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI)), upper 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.

[0271] Note that physical layer signaling may also be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Also, RRC signaling may also be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, etc. Also, MAC signaling may be notified, for example, using a MAC control element (MAC CE (Control Element)).

[0272] Also, the notification of predetermined information (e.g., the notification of "being X") is not limited to an explicit notification, and may be carried out implicitly (e.g., by not carrying out the notification of the predetermined information or by the notification of another piece of information).

[0273] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented by true or false, or by a numerical comparison (e.g., comparison with a predetermined value).

[0274] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, a hardware description language, or by any other name.

[0275] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technologies (such as infrared, microwave, etc.), these wired and / or wireless technologies are included within the definition of a transmission medium.

[0276] The terms "system" and "network" as used herein are used interchangeably.

[0277] In this specification, the terms "base station (BS)", "radio base station", "eNB", "gNB", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. A base station may also be referred to by terms such as fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, small cell, etc.

[0278] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the whole of the coverage area of a base station and / or a base station subsystem that provides communication services in this coverage.

[0279] In this specification, the terms "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" can be used interchangeably. A base station may also be referred to by terms such as fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, small cell, etc.

[0280] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0281] Also, the radio base station in this specification may be read as a user terminal. For example, for a configuration in which the communication between the radio base station and the user terminal is replaced with the communication between multiple user terminals (D2D: Device-to-Device), each aspect / embodiment of the present invention may be applied. In this case, the functions of the above-described radio base station 10 may be configured to be possessed by the user terminal 20. Also, words such as "uplink" and "downlink" may be read as "side". For example, the uplink channel may be read as the side channel.

[0282] Similarly, the user terminal in this specification may be read as a radio base station. In this case, the functions of the above-described user terminal 20 may be configured to be possessed by the radio base station 10.

[0283] In this specification, the operations assumed to be performed by the base station may, in some cases, be performed by its upper node. In a network including one or more network nodes having a base station, it is clear that various operations 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, MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited to these), or a combination thereof.

[0284] Each aspect / embodiment described in this specification may be used alone, in combination, or switched for execution. Also, the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this specification may be rearranged as long as there is no contradiction. For example, for the method described in this specification, the elements of various steps are presented in an exemplary order and are not limited to the presented specific order.

[0285] Each aspect / embodiment described in this specification may be applied to a system using LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable wireless communication methods and / or next-generation systems extended based on these.

[0286] As used herein, the term "based on" 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".

[0287] Any reference to an element using designations such as "first", "second", etc. used herein does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed or that the first element must precede the second element in any form.

[0288] As used herein, the term "determining" may encompass a wide variety of operations. For example, "determining" may be considered to be "determining" by calculating, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, database, or other data structure), ascertaining, etc. Also, "determining" may be considered to be "determining" by receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in memory), etc. Further, "determining" may be considered to be "determining" by resolving, selecting, choosing, establishing, comparing, etc. That is, "determining" may be considered to be "determining" some operation.

[0289] As used herein, the terms "connected", "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed".

[0290] As used herein, when two elements are connected, they can be considered to be "connected" or "coupled" to each other using one or more wires, cables and / or printed electrical connections, and also, by way of some non-limiting and non-exhaustive examples, using electromagnetic energy having wavelengths in the radio frequency region, microwave region and / or optical (both visible and invisible) region, etc.

[0291] As used herein, the term "A and B are different" may mean that "A and B are different from each other". Terms such as "separate", "coupled", etc. may be similarly construed.

[0292] When the terms "including", "comprising", and their variations are used in this specification or in the claims, these terms are intended to be inclusive in the same manner as the term "comprising". Further, the term "or" used in this specification or in the claims is intended not to be an exclusive disjunction.

[0293] Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented in modified and changed forms without departing from the spirit and scope of the present invention as defined by the claims. Therefore, the description in this specification is for illustrative purposes only and does not impose any limiting meaning on the present invention.

Claims

1. a receiving unit that receives at least one downlink shared channel scheduled by at least one downlink control channel; a control unit that, when being set to use a dynamic acknowledgment signal codebook for the at least one downlink shared channel, determines the number of bits of the acknowledgment signal for the at least one downlink shared channel based on the value of the total downlink link allocation indicator included in the at least one downlink control channel; When a plurality of downlink control channels are allocated to different time resources, the value of the total downlink link allocation indicator included in each of the plurality of downlink control channels indicates the number of downlink link allocations arranged in the time direction and the frequency direction; In the mapping of the acknowledgment signal, a 1-bit or 2-bit acknowledgment signal uses the mapping of a cyclic shift or a complex-valued modulation symbol; When the control unit is set to use a quasi-static acknowledgment signal codebook in a serving cell, the control unit controls the transmission of the acknowledgment signal based on the maximum number of downlink transmissions scheduled over a range associated with the feedback timing of the acknowledgment signal set by upper layer signaling. A terminal characterized by this.

2. In the mapping of the acknowledgment signal, at least one of the cyclic shift and the complex-valued modulation symbol mapped to the value 0 of the 1-bit acknowledgment signal is equal to at least one of the cyclic shift and the complex-valued modulation symbol mapped to (0, 0) of the 2-bit acknowledgment signal, and at least one of the cyclic shift and the complex-valued modulation symbol mapped to the value 1 of the 1-bit acknowledgment signal is equal to at least one of the cyclic shift and the complex-valued modulation symbol mapped to (1, 0) of the 2-bit acknowledgment signal. The terminal according to claim 1, characterized by this.

3. In the mapping of the delivery confirmation signal, at least one of the scheduling request and the cyclic shift and complex-valued modulation symbol mapped to the value 0 of the 1-bit delivery confirmation signal is equal to at least one of the scheduling request and the cyclic shift and complex-valued modulation symbol mapped to (0, 0) of the 2-bit delivery confirmation signal, and at least one of the scheduling request and the cyclic shift and complex-valued modulation symbol mapped to the value 1 of the 1-bit delivery confirmation signal is equal to at least one of the scheduling request and the cyclic shift and complex-valued modulation symbol mapped to (1, 0) of the 2-bit delivery confirmation signal. The terminal according to claim 1 or claim 2, characterized in that.

4. Receiving at least one downlink shared channel scheduled by at least one downlink control channel; When it is set to use a dynamic delivery confirmation signal codebook for the at least one downlink shared channel, determining the number of bits of the delivery confirmation signal for the at least one downlink shared channel based on the value of the total downlink allocation indicator included in the at least one downlink control channel; In a serving cell, when it is set to use a quasi-static delivery confirmation signal codebook, controlling the transmission of the delivery confirmation signal based on the maximum number of downlink transmissions scheduled over a range associated with the feedback timing of the delivery confirmation signal set by upper layer signaling. When a plurality of downlink control channels are allocated to different time resources, the value of the total downlink allocation indicator included in each of the plurality of downlink control channels indicates the number of downlink allocations arranged in the time direction and the frequency direction. In the mapping of the delivery confirmation signal, the 1-bit or 2-bit delivery confirmation signal uses the mapping of the cyclic shift or the complex-valued modulation symbol. A wireless communication method for a terminal, characterized in that.

5. A transmitting unit that transmits at least one downlink control channel to a terminal for scheduling at least one downlink shared channel; A receiving unit that receives, from the terminal, an acknowledgment signal for the at least one downlink shared channel, the acknowledgment signal being transmitted based on a value of a total downlink allocation indicator included in the plurality of downlink control channels when it is set for the terminal to use a dynamic acknowledgment signal codebook for the plurality of downlink shared channels; The value of the total downlink allocation indicator is used at the terminal to determine the number of bits of the acknowledgment signal. When the plurality of downlink control channels are allocated to different time resources, the value of the total downlink allocation indicator included in each of the plurality of downlink control channels indicates the number of downlink allocations arranged in the time direction and the frequency direction. In the mapping of the acknowledgment signal, a 1-bit or 2-bit acknowledgment signal uses cyclic shift or mapping of complex-valued modulation symbols. The receiving unit receives, in a serving cell, an acknowledgment signal based on the maximum number of downlink transmissions scheduled over a range associated with the feedback timing of the acknowledgment signal set by upper layer signaling when it is set to use a quasi-static acknowledgment signal codebook. A base station characterized by that.

6. A system having a terminal and a base station, The terminal is A receiving unit that receives at least one downlink shared channel scheduled by at least one downlink control channel; A control unit that determines the number of bits of an acknowledgment signal for the at least one downlink shared channel based on a value of a total downlink allocation indicator included in the plurality of downlink control channels when it is set to use a dynamic acknowledgment signal codebook for the plurality of downlink shared channels; In the mapping of the delivery confirmation signal, a 1-bit or 2-bit delivery confirmation signal uses the mapping of cyclic shift or complex-valued modulation symbols. When the control unit is set to use a quasi-static delivery confirmation signal codebook in a serving cell, it controls the transmission of the delivery confirmation signal based on the maximum number of downlink transmissions scheduled over a range associated with the feedback timing of the delivery confirmation signal set by upper layer signaling. The base station has a transmission unit that transmits the at least one downlink control channel to the terminal, and a reception unit that receives, from the terminal, a delivery confirmation signal for the at least one downlink shared channel, which is transmitted based on the value of the total downlink allocation indicator when the terminal is set to use a dynamic delivery confirmation signal codebook for the at least one downlink shared channel. When the plurality of downlink control channels are allocated to different time resources, the value of the total downlink allocation indicator included in each of the plurality of downlink control channels indicates the number of downlink allocations arranged in the time direction and the frequency direction. The reception unit of the base station is characterized in that, in a serving cell, when it is set to use a quasi-static delivery confirmation signal codebook, it receives a delivery confirmation signal based on the maximum number of downlink transmissions scheduled over a range associated with the feedback timing of the delivery confirmation signal set by upper layer signaling.

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