Terminal device, base station device, and communication method

Abstract

The present invention sets a cyclical resource in an uplink cell managed by a first base station device and transmits, with the set cyclical resource, a HARQ-ACK codebook that includes a HARQ-ACK for the PDSCH of a downlink cell managed by a second base station device.

Description

Technical Field

[0001] The present invention relates to a terminal device, a base station device, and a communication method. This application claims priority to Japanese Patent Application No. 2020-25106, filed on February 18, 2020, the content of which is incorporated herein by reference.

Background Art

[0002] Wireless access methods and wireless networks for cellular mobile communications (hereinafter referred to as "Long Term Evolution (LTE)" or "EUTRA: Evolved Universal Terrestrial Radio Access") are being studied in the 3rd Generation Partnership Project (3GPP). In LTE, a base station device is also called an eNodeB (evolved NodeB), and a terminal device is also called a UE (User Equipment). LTE is a cellular communication system in which a plurality of areas covered by a base station device are arranged in a cell shape. A single base station device may manage a plurality of serving cells.

[0003] In 3GPP, as a communication method for 5G, the study and standardization of the next-generation standard (NR: New Radio) are being carried out. NR is required to satisfy the requirements assuming three scenarios of eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication) within a single technical framework.

[0004] In addition, a method using a plurality of frequency spectra has been studied (Non-Patent Document 2). It has been studied that a plurality of base station apparatuses communicate with terminal apparatuses using different frequency spectra respectively. One base station apparatus uses the frequency spectra of the downlink and the uplink respectively, and the other base station apparatus uses the frequency spectrum of the downlink to communicate with terminal apparatus 1.

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In order to appropriately control the retransmission of data, it is necessary to appropriately feedback the error detection result of the data, the reception result of the data (the received data is not incorrect, the received data is incorrect, the data is not received), etc. from the receiving side of the data to the transmitting side of the data. The transmitting side of the data retransmits the data that has not been appropriately received on the receiving side based on the information fed back from the receiving side of the data. For example, the transmitting side of the data is a base station apparatus, the receiving side of the data is a terminal apparatus, the data is a transport block (transport block transmitted and received by PDSCH), and the error detection result and reception result of the data are HARQ-ACK. By realizing appropriate retransmission control, efficient communication is achieved. One aspect of the present invention provides a terminal apparatus, a base station apparatus, a communication method used for the terminal apparatus, and a communication method used for the base station apparatus that communicate efficiently.

Means for Solving the Problem

[0007] (1) A first aspect of the present invention is a terminal device including a processor and a memory storing computer program code, the terminal device performing operations including setting periodic resources in an uplink cell managed by a first base station device, and transmitting, using the periodic resources, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a second base station device.

[0008] (2) Further, the HARQ-ACK codebook is composed of a plurality of HARQ-ACKs, and each of the HARQ-ACKs corresponds to a different HARQ process.

[0009] (3) Further, when the HARQ-ACK codebook is transmitted, the HARQ-ACK for each stored HARQ process is reset.

[0010] (4) Further, an uplink cell managed by the second base station device is not configured for the terminal device.

[0011] (5) A second aspect of the present invention is a base station device including a processor and a memory storing computer program code, the base station device performing operations including setting periodic resources in an uplink cell for a terminal device, receiving, from the terminal device using the periodic resources, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a different base station device, and transferring the received HARQ-ACK to the different base station device.

[0012] (6) Further, the HARQ-ACK codebook is composed of a plurality of HARQ-ACKs, and each of the HARQ-ACKs corresponds to a different HARQ process.

[0013] (7) A third aspect of the present invention is a communication method used in a terminal device, including a step of setting periodic resources in an uplink cell managed by a first base station device, and a step of transmitting a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a second base station device using the periodic resources.

[0014] (8) Further, the HARQ-ACK codebook is composed of a plurality of HARQ-ACKs, and each of the HARQ-ACKs corresponds to a different HARQ process.

[0015] (9) Further, when the HARQ-ACK codebook is transmitted, it includes a step of resetting the HARQ-ACK for each stored HARQ process.

[0016] (10) Further, the uplink cell managed by the second base station device is not configured for the terminal device.

[0017] (11) A fourth aspect of the present invention is a communication method used in a base station device, including a step of setting periodic resources in an uplink cell for a terminal device, a step of receiving, from the terminal device, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a different base station device using the periodic resources, and a step of transferring the received HARQ-ACK to the different base station device.

[0018] (12) Further, the HARQ-ACK codebook is composed of a plurality of HARQ-ACKs, and each of the HARQ-ACKs corresponds to a different HARQ process.

Advantages of the Invention

[0019] According to one aspect of this invention, a terminal device can communicate efficiently. Also, a base station device can communicate efficiently.

Brief Description of the Drawings

[0020]

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Modes for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be described.

[0022] "A and / or B" may be a term including "A", "B", or "A and B".

[0023] For a parameter or information to indicate one or more values may mean that the parameter or the information includes at least the parameter or information indicating the one or more values. The upper layer parameter may be a single upper layer parameter. The upper layer parameter may be an information element (IE) including a plurality of parameters.

[0024] FIG. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. In FIG. 1, the wireless communication system includes terminal devices 1A to 1C and base station devices 3A to 3B. Hereinafter, the terminal devices 1A to 1C are also referred to as terminal devices 1 (UE). Hereinafter, the base station devices 3A to 3B are also referred to as base station devices 3 (gNB).

[0025] The base station device 3 may be configured to include one or both of an MCG (Master Cell Group) and an SCG (Secondary Cell Group). The MCG is a group of serving cells configured to include at least a PCell (Primary Cell). The SCG is a group of serving cells configured to include at least a PSCell (Primary Secondary Cell). The PCell may be a serving cell given based on an initial connection. The MCG may be configured to include one or more SCells (Secondary Cells). The SCG may be configured to include one or more SCells. A serving cell identifier is a short identifier for identifying a serving cell. The serving cell identifier may be given by an upper layer parameter.

[0026] The terminal device 1 communicates with the base station device 3A (first base station device) and the base station device 3B (second base station device) simultaneously. The base station device 3A and the base station device 3B communicate with the terminal device 1 using different frequency spectrums (carrier frequencies). This operation may be referred to as carrier aggregation or dual connectivity. Each of the communication between the terminal device 1 and the base station device 3A and the communication between the terminal device 1 and the base station device 3B is constituted by different cells (serving cells). The base station device 3A uses the downlink frequency spectrum and the uplink frequency spectrum. The base station device 3B uses only the downlink frequency spectrum. The base station device 3A and the base station device 3B are connected by wire or wirelessly, and an exchange of control information, data, etc. is performed. For example, the control information is HARQ-ACK. The terminal device 1 makes an initial connection with the base station device 3A. After the connection with the base station device 3A is established, a connection with the base station device 3B is added to the terminal device 1. The frequency spectrum used for communication is added to the terminal device 1. The cell (serving cell) used for communication is added to the terminal device 1.

[0027] Hereinafter, the frame configuration will be described.

[0028] In the wireless communication system according to one aspect of the present embodiment, OFDM (Orthogonal Frequency Division Multiplex) is used at least. An OFDM symbol is a unit in the time domain of OFDM. An OFDM symbol includes at least one or a plurality of subcarriers. The OFDM symbol may be converted into a time-continuous signal in baseband signal generation.

[0029] The subcarrier spacing (SCS: SubCarrier Spacing) is such that the subcarrier spacing Δf = 2 μ·It may be given by 15 kHz. For example, the subcarrier spacing configuration μ may be set to any one of 0, 1, 2, 3, 4, and / or 5. For a certain BWP (BandWidth Part), the subcarrier spacing configuration μ may be given by a higher layer parameter.

[0030] In the wireless communication system according to one aspect of the present embodiment, a time unit T is used for expressing the length in the time domain. c is used. The time unit T c is c = 1 / (Δf max ·N f ). Δf max may be the maximum value of the subcarrier spacing supported in the wireless communication system according to one aspect of the present embodiment. Δf max is max = 480 kHz. N f is f = 4096. The constant κ is κ = Δf max ·N f / (Δf ref N f,ref ) = 64. Δf ref may be 15 kHz. N f,ref may be 2048.

[0031] The constant κ may be a value indicating the relationship between the reference subcarrier spacing and T c . The constant κ may be used for the length of the subframe. Based on at least the constant κ, the number of slots included in the subframe may be given. Δf ref is the reference subcarrier spacing, and N f,ref is a value corresponding to the reference subcarrier spacing.

[0032] Transmission in the downlink and / or transmission in the uplink is composed of frames of 10 ms. A frame is composed of 10 subframes. The length of a subframe is 1 ms. The length of the frame may be given regardless of the subcarrier spacing Δf. That is, the setting of the frame may be given regardless of μ. The length of the subframe may be given regardless of the subcarrier spacing Δf. That is, the setting of the subframe may be given regardless of μ.

[0033] For a setting μ of a certain subcarrier spacing, the number and index of slots included in the subframe may be given. For example, the first slot number n μ s may be given in ascending order in the range from 0 to N subframe,μ slot -1 within the subframe. For a setting μ of the subcarrier spacing, the number and index of slots included in the frame may be given. For example, the second slot number n μ s,f may be given in ascending order in the range from 0 to N frame,μ slot -1 within the frame. N consecutive slot symb OFDM symbols may be included in one slot. N slot symb is given based at least in part on the slot configuration and / or the CP (Cyclic Prefix) configuration. The slot configuration may be given at least by the upper layer parameter tdd-UL-DL-ConfigurationCommon. The CP configuration may be given based at least on the upper layer parameters. The CP configuration may be given based at least on dedicated RRC signaling. The first slot number and the second slot number are also referred to as slot numbers (slot indices).

[0034] FIG. 2 shows N according to one aspect of the present embodiment slot symb, an example showing the relationship between the subcarrier spacing setting μ, slot setting, and CP setting. In Fig. 2A, when the slot setting is 0, the subcarrier spacing setting μ is 2, and the CP setting is normal cyclic prefix, N slot symb = 14, N frame,μ slot = 40, N subframe,μ slot = 4. Also, in Fig. 2B, when the slot setting is 0, the subcarrier spacing setting μ is 2, and the CP setting is extended cyclic prefix, N slot symb = 12, N frame,μ slot = 40, N subframe,μ slot = 4. N slot symb at slot setting 0 may correspond to twice that of N slot symb at slot setting 1.

[0035] In the terminal device 1, the subcarrier spacing setting, slot setting, and CP setting common to each cell may be performed, or different subcarrier spacing settings, slot settings, and CP settings may be performed for each cell. In the base station device 3A and the base station device 3B, the subcarrier spacing setting, slot setting, and CP setting common to each other may be performed, or different subcarrier spacing settings, slot settings, and CP settings may be performed.

[0036] FIG. 3 is an example showing the configurations of a radio frame, a subframe, and a slot according to one aspect of the present embodiment. In the example shown in FIG. 3, the length of a slot is 0.5 ms, the length of a subframe is 1 ms, and the length of a radio frame is 10 ms. A slot may be a unit of resource allocation in the time domain. For example, a slot may be a unit to which one transport block is mapped. For example, a transport block may be mapped to one slot. Here, a transport block may be a unit of data transmitted within a predetermined interval (for example, a transmission time interval (TTI)) defined in an upper layer (for example, MAC: Media Access Control, RRC: Radio Resource Control).

[0037] For example, the length of a slot may be given by the number of OFDM symbols. For example, the number of OFDM symbols may be 7 or 14. The length of a slot may be given based at least on the length of an OFDM symbol. The length of an OFDM symbol may differ based at least on a subcarrier interval. Also, the length of an OFDM symbol may be given based at least on the number of points of a fast Fourier transform (FFT) used for generating the OFDM symbol. Also, the length of an OFDM symbol may include the length of a cyclic prefix (CP) added to the OFDM symbol. Here, an OFDM symbol may be referred to as a symbol. Also, in communication between the terminal device 1 and the base station device 3, when a communication method other than OFDM is used (for example, when SC-FDMA or DFT-s-OFDM is used, etc.), the generated SC-FDMA symbol and / or DFT-s-OFDM symbol are also referred to as OFDM symbols. Also, unless otherwise specified, OFDM includes SC-FDMA or DFT-s-OFDM.

[0038] For example, the slot length may be 0.125 ms, 0.25 ms, 0.5 ms, or 1 ms. For example, when the subcarrier spacing is 15 kHz, the slot length may be 1 ms. For example, when the subcarrier spacing is 30 kHz, the slot length may be 0.5 ms. For example, when the subcarrier spacing is 120 kHz, the slot length may be 0.125 ms. For example, when the subcarrier spacing is 15 kHz, the slot length may be 1 ms. For example, when the slot length is 0.125 ms, one subframe may be composed of 8 slots. For example, when the slot length is 0.25 ms, one subframe may be composed of 4 slots. For example, when the slot length is 0.5 ms, one subframe may be composed of 2 slots. For example, when the slot length is 1 ms, one subframe may be composed of 1 slot.

[0039] Here, OFDM includes a multi-carrier communication method to which waveform shaping (Pulse Shape), PAPR reduction, out-of-band radiation reduction, or filtering, and / or phase processing (e.g., phase rotation, etc.) is applied. The multi-carrier communication method may be a communication method that generates / transmits a signal in which a plurality of subcarriers are multiplexed.

[0040] The radio frame may be given by the number of subframes. The number of subframes for the radio frame may be, for example, 10. The radio frame may be given by the number of slots.

[0041] In the terminal device 1, the configuration of the radio frame, the configuration of the subframe, and the configuration of the slot that are common to each cell may be set, or the configuration of the radio frame, the configuration of the subframe, and the configuration of the slot that are different for each cell may be set. In the base station device 3A and the base station device 3B, the configuration of the radio frame, the configuration of the subframe, and the configuration of the slot that are common may be set, or the configuration of the radio frame, the configuration of the subframe, and the configuration of the slot that are different may be set.

[0042] The physical resources will be described below.

[0043] An antenna port is defined by the fact that the channel through which a symbol is transmitted at one antenna port can be estimated from the channel through which other symbols are transmitted at the same antenna port. If the large scale property of the channel through which a symbol is transmitted at one antenna port can be estimated from the channel through which a symbol is transmitted at another antenna port, the two antenna ports are said to be QCL (Quasi Co-Located). The large scale property may at least include the long-term characteristics of the channel. The large scale property may at least include a part or all of the delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters. For the first antenna port and the second antenna port to be QCL with respect to the beam parameters, it may mean that the receive beam assumed by the receiving side for the first antenna port is the same as the receive beam assumed by the receiving side for the second antenna port. For the first antenna port and the second antenna port to be QCL with respect to the beam parameters, it may mean that the transmit beam assumed by the receiving side for the first antenna port is the same as the transmit beam assumed by the receiving side for the second antenna port. It may be assumed that for the terminal device 1, if the large scale property of the channel through which a symbol is transmitted at one antenna port can be estimated from the channel through which a symbol is transmitted at another antenna port, the two antenna ports are QCL. That the two antenna ports are QCL may mean that it is assumed that the two antenna ports are QCL.

[0044] For each of the subcarrier spacing setting and the carrier set, N μRB,x N RB sc sub - carriers and N (μ) symb N subframe,μ symb resource grids of N OFDM symbols are provided. N μ RB,x may indicate the number of resource blocks provided for the sub - carrier spacing setting μ for carrier x. N μ RB,x may be the maximum number of resource blocks provided for the sub - carrier spacing setting μ for carrier x. Carrier x indicates either a down - link carrier or an up - link carrier. That is, x is either “DL” or “UL”. N μ RB is N μ RB,DL , and / or N μ RB,UL is a name including. N RB sc may indicate the number of sub - carriers included in one resource block. At least one resource grid may be provided for each antenna port p, and / or for each sub - carrier spacing setting μ, and / or for each transmission direction setting. The transmission direction includes at least down - link (DL: DownLink) and up - link (UL: UpLink). Hereinafter, a set of parameters including at least a part or all of antenna port p, sub - carrier spacing setting μ, and transmission direction setting is also called a first radio parameter set. That is, one resource grid may be provided for each first radio parameter set.

[0045] In the downlink, the carrier included in the serving cell is referred to as a downlink carrier (or a downlink component carrier). In the uplink, the carrier included in the serving cell is referred to as an uplink carrier (an uplink component carrier). The downlink component carrier and the uplink component carrier are collectively referred to as a component carrier (or a carrier).

[0046] Each element in the resource grid given for each first radio parameter set is referred to as a resource element. The resource element is an index k in the frequency domain sc and an index l in the time domain sym and is specified thereby. For a certain first radio parameter set, the resource element is an index k in the frequency domain sc and an index l in the time domain sym and is specified thereby. The resource element specified by the index k in the frequency domain sc and the index l in the time domain sym is also referred to as a resource element (k sc , l sym ). The index k in the frequency domain sc indicates any value from 0 to N μ RB N RB sc -1. N μ RB may be the number of resource blocks given for the subcarrier spacing setting μ. N RB sc is the number of subcarriers included in the resource block, and N RB sc = 12. The index k in the frequency domain sc may correspond to the subcarrier index k sc . The index l in the time domain sym may correspond to the OFDM symbol index l sym .

[0047] FIG. 4 is a schematic diagram showing an example of a resource grid in a subframe according to an aspect of the present embodiment. In the resource grid of FIG. 4, the horizontal axis is the index l of the time domain sym and the vertical axis is the index k of the frequency domain sc . In one subframe, the frequency domain of the resource grid is N μ RB N RB sc subcarriers. In one subframe, the time domain of the resource grid may include 14·2 μ OFDM symbols. One resource block is configured to include N RB sc subcarriers. The time domain of the resource block may correspond to 1 OFDM symbol. The time domain of the resource block may correspond to 14 OFDM symbols. The time domain of the resource block may correspond to one or more slots. The time domain of the resource block may correspond to one subframe.

[0048] FIG. 4 shows an example of a resource grid in one cell.

[0049] The terminal device 1 may be instructed to perform transmission and reception using only a subset of the resource grid. The subset of the resource grid is also referred to as a BWP, and the BWP may be given based at least on upper layer parameters and / or part or all of the DCI. The BWP is also referred to as a bandwidth part (BP). That is, the terminal device 1 may not be instructed to perform transmission and reception using all sets of the resource grid. That is, the terminal device 1 may be instructed to perform transmission and reception using some frequency resources within the resource grid. One BWP may be composed of a plurality of resource blocks in the frequency domain. One BWP may be composed of a plurality of consecutive resource blocks in the frequency domain. The BWP set for the downlink carrier is also referred to as the downlink BWP. The BWP set for the uplink carrier is also referred to as the uplink BWP.

[0050] One or more downlink BWPs may be set for the terminal device 1. The terminal device 1 may attempt to receive a physical channel (e.g., PDCCH, PDSCH, SS / PBCH, etc.) in one of the one or more downlink BWPs. The one downlink BWP is also referred to as the active downlink BWP.

[0051] One or more uplink BWPs may be set for the terminal device 1. The terminal device 1 may attempt to transmit a physical channel (e.g., PUCCH, PUSCH, PRACH, etc.) in one of the one or more uplink BWPs. The one uplink BWP is also referred to as the active uplink BWP.

[0052] A set of downlink BWPs may be set for each serving cell. The set of downlink BWPs may include one or more downlink BWPs. A set of uplink BWPs may be set for each serving cell. The set of uplink BWPs may include one or more uplink BWPs.

[0053] The upper layer parameters are the parameters included in the upper layer signal. The upper layer signal may be RRC (Radio Resource Control) signaling or MAC CE (Medium Access Control Control Element). Here, the upper layer signal may be a signal of the RRC layer or a signal of the MAC layer.

[0054] The upper layer signal may be common RRC signaling. The common RRC signaling may at least include some or all of the following features C1 to C3. Feature C1) Mapped to the BCCH logical channel or the CCCH logical channel Feature C2) At least including the radioResourceConfigCommon information element Feature C3) Mapped to the PBCH

[0055] The radioResourceConfigCommon information element may include information indicating settings commonly used in the serving cell. The settings commonly used in the serving cell may at least include the settings of the PRACH. The settings of the PRACH may at least indicate one or more random access preamble indexes. The settings of the PRACH may at least indicate the time / frequency resources of the PRACH.

[0056] The upper layer signal may be dedicated RRC signaling. The dedicated RRC signaling may at least include some or all of the following features D1 to D2. Feature D1) Mapped to the DCCH logical channel Feature D2) At least including the radioResourceConfigDedicated information element

[0057] The radioResourceConfigDedicated information element may at least include information indicating settings specific to the terminal device 1. The radioResourceConfigDedicated information element may at least include information indicating the configuration of the BWP. The configuration of the BWP may at least indicate the frequency resources of the BWP.

[0058] For example, the MIB, the first system information, and the second system information may be included in the common RRC signaling. Also, a higher layer message mapped to the DCCH logical channel and including at least radioResourceConfigCommon may be included in the common RRC signaling. Also, a higher layer message mapped to the DCCH logical channel and not including the radioResourceConfigCommon information element may be included in the dedicated RRC signaling. Also, a higher layer message mapped to the DCCH logical channel and including at least the radioResourceConfigDedicated information element may be included in the dedicated RRC signaling.

[0059] The first system information may at least indicate the time index of the SS (Synchronization Signal) block. The SS block is also referred to as the SS / PBCH block. The SS / PBCH block is also referred to as SS / PBCH. The first system information may at least include information related to the PRACH resources. The first system information may at least include information related to the settings for the initial connection. The second system information may be system information other than the first system information.

[0060] The radioResourceConfigDedicated information element may at least include information related to the PRACH resources. The radioResourceConfigDedicated information element may at least include information related to the settings for the initial connection.

[0061] Hereinafter, the physical channels and physical signals according to various aspects of the present embodiment will be described.

[0062] The uplink physical channel may correspond to a set of resource elements that carry information generated in the upper layer. The uplink physical channel is a physical channel used in the uplink carrier. In a wireless communication system according to an aspect of the present embodiment, at least some or all of the following uplink physical channels are used. · PUCCH (Physical Uplink Control CHannel) · PUSCH (Physical Uplink Shared CHannel) · PRACH (Physical Random Access CHannel)

[0063] The PUCCH may be used to transmit uplink control information (UCI: Uplink Control Information). The uplink control information includes some or all of hybrid automatic repeat request acknowledgement (HARQ-ACK) corresponding to channel state information (CSI), scheduling request (SR), transport block (TB, MAC PDU: Medium Access Control Protocol Data Unit, DL-SCH: Downlink-Shared Channel, PDSCH: Physical Downlink Shared Channel). Note that the uplink control information may include information not described above.

[0064] The HARQ-ACK may at least include HARQ-ACK bits (HARQ-ACK information) corresponding to at least one transport block. The HARQ-ACK bits may indicate an ACK (acknowledgement) or NACK (negative-acknowledgement) corresponding to one or more transport blocks. The HARQ-ACK may at least include a HARQ-ACK codebook including one or more HARQ-ACK bits. The fact that the HARQ-ACK bits correspond to one or more transport blocks may mean that the HARQ-ACK bits correspond to a PDSCH including the one or more transport blocks. The HARQ-ACK bits may indicate an ACK or NACK corresponding to one CBG (Code Block Group) included in the transport block.

[0065] A scheduling request (SR) may be at least used to request resources for a PUSCH for initial transmission. Scheduling request bits may be used to indicate either a positive SR or a negative SR. The fact that the scheduling request bits indicate a positive SR is also referred to as "a positive SR is transmitted". The positive SR may indicate that a terminal device 1 requests resources for a PUSCH for initial transmission. The positive SR may indicate that a scheduling request is triggered by a higher layer. The positive SR may be transmitted when it is indicated by a higher layer to transmit a scheduling request. The fact that the scheduling request bits indicate a negative SR is also referred to as "a negative SR is transmitted". The negative SR may indicate that a terminal device 1 does not request resources for a PUSCH for initial transmission. The negative SR may indicate that a scheduling request is not triggered by a higher layer. The negative SR may be transmitted when it is not indicated by a higher layer to transmit a scheduling request.

[0066] The channel state information may at least include part or all of a channel quality indicator (CQI), a precoder matrix indicator (PMI), and a rank indicator (RI). The CQI is an indicator related to the quality of a channel (e.g., propagation strength), the PMI is an indicator for instructing a precoder, and the RI is an indicator for instructing a transmission rank (or the number of transmission layers).

[0067] One or more PUCCH formats (from PUCCH format 0 to PUCCH format 4) may be supported for the PUCCH. The PUCCH format may be mapped to and transmitted on the PUCCH. The PUCCH format may be transmitted on the PUCCH. The transmission of the PUCCH format may be the transmission of the PUCCH.

[0068] The PUSCH is at least used to transmit a transport block (TB, MAC PDU, UL-SCH, PUSCH). The PUSCH may be used to at least transmit part or all of a transport block, a HARQ-ACK, channel state information, and a scheduling request. The PUSCH is at least used to transmit a random access message 3. The PUSCH may be used to transmit information not described above.

[0069] The PRACH is at least used to transmit a random access preamble (random access message 1). The PRACH may be at least used for an initial connection establishment procedure, a handover procedure, a connection re - establishment procedure, synchronization (timing adjustment) for PUSCH transmission, and indicating part or all of the resource request for PUSCH. The random access preamble may be used to notify the base station device 3 of an index (random access preamble index) given by the upper layer of the terminal device 1.

[0070] In FIG. 1, in uplink wireless communication, the following uplink physical signals are used. The uplink physical signals may not be used to transmit information output from the upper layer, but are used by the physical layer. · UL DMRS (UpLink Demodulation Reference Signal) · SRS (Sounding Reference Signal) · UL PTRS (UpLink Phase Tracking Reference Signal)

[0071] The UL DMRS is related to the transmission of PUSCH and / or PUCCH. The UL DMRS is multiplexed with PUSCH or PUCCH. The base station device 3 may use the UL DMRS to perform channel compensation for PUSCH or PUCCH. Hereinafter, transmitting PUSCH and the UL DMRS related to the PUSCH together is simply referred to as transmitting PUSCH. Hereinafter, transmitting PUCCH and the UL DMRS related to the PUCCH together is simply referred to as transmitting PUCCH. The UL DMRS related to PUSCH is also referred to as PUSCH - specific UL DMRS. The UL DMRS related to PUCCH is also referred to as PUCCH - specific UL DMRS.

[0072] The SRS may not be related to the transmission of PUSCH or PUCCH. The base station device 3 may use the SRS for channel state measurement. The SRS may be transmitted at the end of the subframe in the uplink slot, or in a predetermined number of OFDM symbols from the end.

[0073] The UL PTRS may be a reference signal used at least for phase tracking. The UL PTRS may be related to a UL DMRS group including at least the antenna port used for one or more UL DMRSs. The association between the UL PTRS and the UL DMRS group may be that at least some or all of the antenna ports of the UL PTRS and the UL DMRS group are QCL. The UL DMRS group may be identified based at least on the antenna port with the smallest index among the UL DMRSs included in the UL DMRS group. The UL PTRS may be mapped to the antenna port with the smallest index among one or more antenna ports to which one codeword is mapped. When one codeword is mapped to at least the first layer and the second layer, the UL PTRS may be mapped to the first layer. The UL PTRS may not be mapped to the second layer. The index of the antenna port to which the UL PTRS is mapped may be given based at least on the downlink control information.

[0074] In addition, an uplink physical signal not described above may be used.

[0075] In FIG. 1, in the downlink wireless communication from the base station device 3 to the terminal device 1, the following downlink physical channels are used. The downlink physical channel is used by the physical layer to transmit information output from the upper layer. ·PBCH (Physical Broadcast Channel) ·PDCCH (Physical Downlink Control Channel) ·Physical Downlink Shared Channel (PDSCH)

[0076] The PBCH is at least used to transmit the Master Information Block (MIB: Master Information Block, BCH, Broadcast Channel). The PBCH may be transmitted based on a predetermined transmission interval. The PBCH may be transmitted at an interval of 80 ms. The PBCH may be transmitted at an interval of 160 ms. The content of the information included in the PBCH may be updated every 80 ms. Some or all of the information included in the PBCH may be updated every 160 ms. The PBCH may be composed of 288 subcarriers. The PBCH may be configured to include 2, 3, or 4 OFDM symbols. The MIB may include information related to the identifier (index) of the synchronization signal. The MIB may include information indicating at least a part of the number of the slot, the number of the subframe, and / or the number of the radio frame in which the PBCH is transmitted.

[0077] The PDCCH is used at least for the transmission of downlink control information (DCI: Downlink Control Information). The PDCCH may be transmitted including at least the downlink control information. The PDCCH may include the downlink control information. The downlink control information is also referred to as a DCI format. The downlink control information may include at least either a downlink grant (DL grant) or an uplink grant (UL grant). The DCI format used for the scheduling of the PDSCH is also referred to as a downlink DCI format. The DCI format used for the scheduling of the PUSCH is also referred to as an uplink DCI format. The downlink grant is also referred to as a downlink assignment (DL assignment) or a downlink allocation (DL allocation). The uplink DCI format includes at least one or both of DCI format 0_0 and DCI format 0_1.

[0078] DCI format 0_0 is configured to include at least a part or all of 1A to 1F. 1A) DCI format specific field (Identifier for DCI formats field) 1B) Frequency domain resource assignment field 1C) Time domain resource assignment field 1D) Frequency hopping flag field 1E) MCS field (MCS field: Modulation and Coding Scheme field) 1F) CSI request field

[0079] The DCI format identification field may be used at least to indicate which of one or more DCI formats the DCI format including the DCI format identification field corresponds to. The one or more DCI formats may be given based at least in part on all or part of DCI format 1_0, DCI format 1_1, DCI format 0_0, and / or DCI format 0_1.

[0080] The frequency domain resource allocation field may be used at least to indicate the allocation of frequency resources for the PUSCH scheduled by the DCI format including the frequency domain resource allocation field. The frequency domain resource allocation field is also referred to as the FDRA (Frequency Domain Resource Allocation) field.

[0081] The time domain resource allocation field may be used at least to indicate the allocation of time resources for the PUSCH scheduled by the DCI format including the time domain resource allocation field.

[0082] The frequency hopping flag field may be used at least to indicate whether frequency hopping is applied to the PUSCH scheduled by the DCI format including the frequency hopping flag field.

[0083] The MCS field may be used at least to indicate the modulation scheme for the PUSCH scheduled by the DCI format including the MCS field, and / or part or all of the target coding rate. The target coding rate may be the target coding rate for the transport block of the PUSCH. The size of the transport block (TBS: Transport Block Size) may be given based at least on the target coding rate.

[0084] The CSI request field is used at least to indicate the reporting of CSI. The size of the CSI request field may be a predetermined value. The size of the CSI request field may be 0, 1, 2, or 3.

[0085] DCI format 0_1 is composed of at least including part or all of 2A to 2H. 2A) DCI format specific field 2B) Frequency domain resource allocation field 2C) Time domain resource allocation field 2D) Frequency hopping flag field 2E) MCS field 2F) CSI request field (CSI request field) 2G) BWP field (BWP field) 2H) UL DAI field (downlink assignment index)

[0086] The UL DAI field is used at least to indicate the transmission status of the PDSCH. When a dynamic HARQ-ACK codebook is used, the size of the UL DAI field may be 2 bits. The UL DAI field indicates the size of the HARQ-ACK codebook transmitted on the PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook transmitted on the PUSCH. The UL DAI field indicates the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH. The UL DAI field indicates the number of PDSCHs and SPS releases in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH.

[0087] The UL DAI field may indicate a value to which a modulo operation is applied. An example where the UL DAI field is 2 bits will be described. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 0, "00" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 1, "01" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 2, "10" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 3, "11" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 4, "00" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 5, "01" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 6, "10" is indicated as the UL DAI field. When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH is 7, "11" is indicated as the UL DAI field. In this example, in the HARQ-ACK codebook transmitted on the PUSCH, a modulo operation using the numerical value '4' is performed on the number of PDSCHs in which the corresponding HARQ-ACK is included.

[0088] The terminal device 1 interprets the UL DAI field in consideration of the total number of received PDSCHs. For example, the terminal device 1 has received 4 PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs for which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH indicated by the UL DAI field is 4. For example, the terminal device 1 has received 3 PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs for which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH indicated by the UL DAI field is 4, and determines that the reception of one PDSCH has been missed.

[0089] The BWP field may be used to indicate the uplink BWP to which the PUSCH scheduled by DCI format 0_1 is mapped.

[0090] The CSI request field is at least used to indicate the reporting of CSI. The size of the CSI request field may be given based at least on the upper layer parameter ReportTriggerSize.

[0091] The downlink DCI format includes at least one or both of DCI format 1_0 and DCI format 1_1.

[0092] DCI format 1_0 is configured to include at least a part or all of 3A to 3H. 3A) DCI format specific field (Identifier for DCI formats field) 3B) Frequency domain resource assignment field 3C) Time domain resource assignment field 3D) Frequency hopping flag field 3E) MCS field (Modulation and Coding Scheme field) 3F) First CSI request field 3G) PDSCH-to-HARQ feedback timing indicator field 3H) PUCCH resource indicator field

[0093] The timing indication field from PDSCH to HARQ feedback may be a field indicating timing K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the PUCCH or PUSCH that includes at least the HARQ-ACK corresponding to the transport block included in the PDSCH may be n + K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH that includes at least the HARQ-ACK corresponding to the transport block included in the PDSCH may be n + K1.

[0094] Hereinafter, the PDSCH-to-HARQ feedback timing indicator field (PDSCH-to-HARQ_feedback timing indicator field) may also be referred to as the HARQ indication field.

[0095] The PUCCH resource indication field may be a field indicating the index of one or more PUCCH resources included in a PUCCH resource set.

[0096] DCI format 1_1 is composed of at least a part or all of 4A to 4J. 4A) DCI format specific field (Identifier for DCI formats field) 4B) Frequency domain resource assignment field 4C) Time domain resource assignment field 4D) Frequency hopping flag field 4E) MCS field (MCS field: Modulation and Coding Scheme field) 4F) First CSI request field 4G) PDSCH-to-HARQ feedback timing indicator field 4H) PUCCH resource indicator field 4J) BWP field

[0097] The BWP field may be used to indicate the downlink BWP to which the PDSCH scheduled by DCI format 1_1 is mapped.

[0098] DCI format 2_0 may be composed of at least one or more slot format indicators (SFI).

[0099] The downlink control information may include a slot format indicator (SFI). A pattern indicating whether each subframe (slot) in a plurality of subframes (slots) is an uplink subframe (slot), a downlink subframe (slot), or a flexible subframe (slot) may be transmitted and received using the downlink control information. The terminal device 1 may determine that a subframe (slot) not indicated by the received SFI is a flexible subframe (slot). When PUSCH transmission is scheduled by a UL grant for a flexible subframe (slot), the terminal device 1 processes the flexible subframe (slot) as an uplink subframe (slot). When PUSCH transmission is not scheduled by a UL grant for a flexible subframe (slot), the terminal device 1 monitors PDCCH candidates in the flexible subframe (slot) and performs a process of detecting a DL assignment. When PDSCH reception is scheduled by a DL assignment in a flexible subframe (slot), the terminal device 1 processes the flexible subframe (slot) as a downlink subframe (slot).

[0100] For example, the downlink control information including a downlink grant or an uplink grant is transmitted and received on a PDCCH including a C-RNTI (Cell-Radio Network Temporary Identifier).

[0101] In various aspects of this embodiment, unless otherwise specified, the number of resource blocks indicates the number of resource blocks in the frequency domain.

[0102] The downlink grant is used at least for the scheduling of one PDSCH within one serving cell. The downlink grant is used at least for the scheduling of a PDSCH within the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for the scheduling of a PDSCH within a slot different from the slot in which the downlink grant is transmitted. The uplink grant is used at least for the scheduling of one PUSCH within one serving cell.

[0103] Note that each type of DCI format may further include fields different from the above-mentioned fields. For example, it may include a field (NFI: New Feedback Indicator field) indicating whether the HARQ-ACK information of the PDSCH has been correctly detected. It may include a field (NFI field) indicating whether to erase (flush) the HARQ-ACK bits stored in a recording medium such as a memory. It may include a field (NFI field) indicating whether to include the retransmission of the transmitted HARQ-ACK codebook. It may include a field (PGI: PDSCH Group ID field) indicating the PDSCH group to which the PDSCH scheduled by the DCI format belongs (is associated). It may include a field (RPGI: Request PDSCH Group ID field) indicating the PDSCH group for which the transmission of HARQ-ACK information is instructed. It may include a field (C-DAI: Counter Downlink Assignment Index field) indicating the cumulative number of transmitted PDCCHs. It may include a field (T-DAI: Total Downlink Assignment Index field) indicating the total number of transmitted PDCCHs.

[0104] The terminal device 1 may associate a PDSCH group identifier (PGI: PDSCH Group ID) with each PDSCH. The PGI of a certain PDSCH may be indicated based at least on the DCI format used for scheduling the PDSCH. For example, a field indicating the PGI (PGI field) may be included in the DCI format. For example, a PDSCH group may be a set of PDSCHs having the same PGI (PDSCH group identifier). A PDSCH group may be one PDSCH, or a set of one or more PDSCHs associated with the same PGI. The number of PDSCH groups set for the terminal device 1 may be 1, 2, 3, 4, or any other integer greater than or equal to 0.

[0105] The Requested PDSCH Group (RPG) may be a PDSCH group corresponding to the HARQ-ACK information transmitted (reported) via the next PUCCH or PUSCH. The RPG (Requested PDSCH Group) may include one PDSCH group or a plurality of PDSCH groups. The indication of the RPG may be shown in the form of a bitmap corresponding to each PDSCH group based at least on the DCI format. The RPG may be indicated based at least on the RPGI field included in the DCI format. The terminal device 1 may generate a HARQ-ACK codebook for the indicated RPG and transmit (report) it via the PUCCH or PUSCH.

[0106] The value of K1 (information or parameter indicated by the timing indication field from PDSCH to HARQ feedback) indicated by the DCI format included in the PDCCH may be numerical or non-numerical. Here, the numerical value means a value represented by numbers, for example, it may be a value among {0, 1, 2,..., 15}. The non-numerical value may mean a value other than numbers or may mean not indicating a numerical value. Hereinafter, the operation of the numerical value of K1 and the non-numerical value of K1 will be described. For example, the PDSCH scheduled by the DCI format is transmitted by the base station device 3 in slot n and received by the terminal device 1. When the value of K1 indicated by the DCI format is numerical, the terminal device 1 may transmit (report) the HARQ-ACK information corresponding to the PDSCH via the PUCCH or PUSCH in slot n+K1. When the value of K1 indicated by the DCI format is non-numerical, the terminal device 1 may postpone the reporting of the HARQ-ACK information corresponding to the PDSCH. When the non-numerical value of K1 is indicated by the DCI format including the scheduling information of the PDSCH, the terminal device 1 may postpone the reporting of the HARQ-ACK information corresponding to the PDSCH. For example, the terminal device 1 may store the HARQ-ACK information in a recording medium such as a memory, and without transmitting (reporting) the HARQ-ACK information via the next PUCCH or PUSCH, the transmission of the HARQ-ACK information may be triggered based at least on a DCI format other than the aforementioned DCI format and the HARQ-ACK information may be transmitted (reported).

[0107] The value of non-numerical K1 may be included in the series of upper layer parameters. The upper layer parameter may be the upper layer parameter dl-DataToUL-ACK. The upper layer parameter may be an upper layer parameter different from the upper layer parameter dl-DataToUL-ACK. The value of K1 may be a value indicated by the timing indication field from the PDSCH included in the DCI format to the HARQ feedback in the series of upper layer parameters. For example, assuming that the series of upper layer parameters is set to {0, 1, 2, 3, 4, 5, 15, non-numerical value} and the number of bits of the timing indication field from the PDSCH to the HARQ feedback is 3, the code point "000" of the timing indication field from the PDSCH to the HARQ feedback may indicate that the value of K1 is 0, the code point "001" may indicate that the value of K1 is 1, and the code point "111" may indicate that the value of K1 is a non-numerical value. For example, assuming that the series of upper layer parameters is set to {non-numerical value, 0, 1, 2, 3, 4, 5, 15} and the number of bits of the timing indication field from the PDSCH to the HARQ feedback is 3, the code point "000" of the timing indication field from the PDSCH to the HARQ feedback may indicate that the value of K1 is a non-numerical value, the code point "001" may indicate that the value of K1 is 0, and the code point "111" may indicate that the value of K1 is 15.

[0108] The HARQ-ACK bits (HARQ-ACK information) corresponding to the transport block transmitted and received in the downlink frequency band (frequency spectrum, carrier, component carrier) of the base station apparatus 3A are transmitted and received in the uplink frequency band (frequency spectrum, carrier, component carrier) of the base station apparatus 3A by the method as described above based on at least one of the various fields (PDSCH-to-HARQ feedback timing indicator field, HARQ indication field, PUCCH resource indication field, NFI field, PGI field, RPGI field, C-DAI field, T-DAI field, UL DAI field) included in the DCI format as described above.

[0109] The HARQ-ACK bits (HARQ-ACK information) corresponding to the transport blocks transmitted and received in the downlink frequency band (frequency spectrum, carrier, component carrier) of the base station apparatus 3B are transmitted and received using periodically set resources in the uplink frequency band (frequency spectrum, carrier, component carrier) of the base station apparatus 3A. Here, the timing (time resource) at which the HARQ-ACK bits (HARQ-ACK information) are transmitted and received is not indicated by the DCI format. Here, the resources (resource blocks, codes) in the frequency domain at which the HARQ-ACK bits (HARQ-ACK information) are transmitted and received are not indicated by the DCI format. Here, the PDSCH group to which the transmitted and received HARQ-ACK bits (HARQ-ACK information) belong is not indicated by the DCI format, and the HARQ-ACK bits (HARQ-ACK information) for each HARQ process in the downlink of the base station apparatus 3B are transmitted and received in the uplink frequency band of the base station apparatus 3A. The HARQ-ACK bits (HARQ-ACK information) corresponding to the transport blocks transmitted and received in the downlink frequency band of the base station apparatus 3B are transmitted and received using a HARQ-ACK codebook composed of HARQ-ACK bits corresponding to a plurality of HARQ processes. Each time this HARQ-ACK codebook is transmitted, the HARQ-ACK bits (HARQ-ACK information) for each HARQ-process held in the terminal device 1 are reset or flushed.

[0110] One physical channel may be mapped to one serving cell. One physical channel may be mapped to one BWP configured for one carrier included in one serving cell.

[0111] The terminal device 1 may have one or more control resource sets (CORESETs: COntrol REsource SETs) configured. The terminal device 1 monitors the PDCCH in one or more control resource sets. Here, monitoring the PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that the PDCCH may include one or more PDCCH candidates and / or a set of PDCCH candidates. Also, monitoring the PDCCH may include monitoring and detecting the PDCCH and / or the DCI format transmitted via the PDCCH.

[0112] The control resource set may be a time-frequency region where one or more PDCCHs can be mapped. The control resource set may be a region where the terminal device 1 monitors the PDCCH. The control resource set may be composed of contiguous resources (Localized resource). The control resource set may be composed of non-contiguous resources (distributed resource).

[0113] In the frequency domain, the mapping unit of the control resource set may be a resource block. For example, in the frequency domain, the mapping unit of the control resource set may be 6 resource blocks. In the time domain, the mapping unit of the control resource set may be an OFDM symbol. For example, in the time domain, the mapping unit of the control resource set may be 1 OFDM symbol.

[0114] The mapping of the control resource set to the resource blocks may be given based at least on a higher layer parameter. The higher layer parameter may include a bitmap for a group of resource blocks (RBG: Resource Block Group). The group of resource blocks may be given by 6 consecutive resource blocks.

[0115] The number of OFDM symbols constituting the control resource set may be given based at least on upper layer parameters. For example, the start position of the OFDM symbols constituting the control resource set is notified from the base station device 3 to the terminal device 1 using upper layer signaling. For example, the end position of the OFDM symbols constituting the control resource set is notified from the base station device 3 to the terminal device 1 using upper layer signaling.

[0116] A certain control resource set may be a common control resource set. The common control resource set may be a control resource set that is commonly set for a plurality of terminal devices 1. The common control resource set may be given based at least on the MIB, the first system information, the second system information, the common RRC signaling, and part or all of the cell ID. For example, the time resource and / or the frequency resource of the control resource set that is set to monitor the PDCCH used for scheduling the first system information may be given based at least on the MIB.

[0117] The control resource set set in the MIB is also referred to as CORESET#0. CORESET#0 may be a control resource set with index #0.

[0118] A control resource set may be a dedicated control resource set. The dedicated control resource set may be a control resource set configured to be dedicatedly used for the terminal device 1. The dedicated control resource set may be given based at least on dedicated RRC signaling and part or all of the value of C-RNTI. A plurality of control resource sets may be configured for the terminal device 1, and an index (control resource set index) may be assigned to each control resource set. One or more control channel elements (CCEs) may be configured in the control resource set, and an index (CCE index) may be assigned to each CCE.

[0119] A CCE may be configured to include one or a plurality of groups of REGs. The group of REGs is also referred to as a REG bundle. The number of REGs constituting one group of REGs is referred to as the Bundle size. For example, the Bundle size of REGs may be any one of 1, 2, 3, and 6. In interleaved mapping, an interleaver may be applied in units of REG bundles. The terminal device 1 may assume that the precoders applied to the REs within the group of REGs are the same. Based on the assumption that the precoders applied to the REs within the group of REGs are the same, the terminal device 1 can perform channel estimation. On the other hand, the terminal device 1 may assume that the precoders applied to the REs between the groups of REGs are not the same. In other words, the terminal device 1 does not have to assume that the precoders applied to the REs between the groups of REGs are the same. "Between the groups of REGs" may be rephrased as "between two different groups of REGs". Based on the assumption that the precoders applied to the REs between the groups of REGs are not the same, the terminal device 1 can perform channel estimation.

[0120] The set of PDCCH candidates monitored by the terminal device 1 is defined from the perspective of the search space. That is, the set of PDCCH candidates monitored by the terminal device 1 is given by the search space.

[0121] The search space may be configured to include one or more PDCCH candidates at one or more aggregation levels. The aggregation level of a PDCCH candidate may indicate the number of CCEs that make up the PDCCH. The PDDCH candidate may be mapped to one or more CCEs.

[0122] The number of CCEs that make up a PDCCH candidate is also referred to as the aggregation level (AL). When one PDCCH candidate is composed of the aggregation of multiple CCEs, one PDCCH candidate is composed of multiple CCEs with consecutive CCE numbers. The set of PDCCH candidates with an aggregation level of AL X is also referred to as the search space with an aggregation level of AL. X That is, the search space with an aggregation level of AL X may be configured to include one or more PDCCH candidates with an aggregation level of AL. X Also, the search space may include PDCCH candidates at multiple aggregation levels. For example, the CSS may include PDCCH candidates at multiple aggregation levels. For example, the USS may include PDCCH candidates at multiple aggregation levels. The set of aggregation levels of the PDCCH candidates included in the CSS and the set of aggregation levels of the PDCCH candidates included in the USS may be respectively specified / set.

[0123] The terminal device 1 may monitor at least one or a plurality of search spaces in a slot where DRX (Discontinuous Reception) is not set. DRX may be given based at least on upper layer parameters. The terminal device 1 may monitor at least one or a plurality of search space sets in a slot where DRX is not set. A plurality of search space sets may be configured for the terminal device 1. An index (search space set index) may be assigned to each search space set.

[0124] The search space set may be configured to include at least one or a plurality of search spaces. An index (search space index) may be assigned to each search space.

[0125] Each of the search space sets may be at least associated with one control resource set. Each of the search space sets may be included in one control resource set. An index of the control resource set associated with the search space set may be given for each of the search space sets.

[0126] The search space may have two types: CSS (Common Search Space) and USS (UE-specific Search Space). CSS may be a search space that is commonly set for a plurality of terminal devices 1. USS may be a search space that includes settings dedicated for an individual terminal device 1. CSS may be given based at least on a synchronization signal, MIB, first system information, second system information, common RRC signaling, dedicated RRC signaling, cell ID, etc. USS may be given based at least on dedicated RRC signaling and / or the value of C-RNTI. CSS may be a search space set in a resource (control resource element) common to a plurality of terminal devices 1. USS may be a search space set in a resource (control resource element) for each individual terminal device 1.

[0127] For the type 0 PDCCH CSS for the DCI format scrambled by the SI-RNTI used to transmit system information in the primary cell, and the type 1 PDCCH CSS for the DCI format scrambled by the RA-RNTI and TC-RNTI used for initial access, CSS may be used. For the type of PDCCH CSS for the DCI format scrambled by the CC-RNTI used for Unlicensed access, CSS may be used. The terminal device 1 can monitor PDCCH candidates in those search areas. The DCI format scrambled by a predetermined RNTI may be a DCI format with a CRC (Cyclic Redundancy Check) scrambled by the predetermined RNTI added thereto.

[0128] The information related to the reception of the PDCCH may include information related to the ID indicating the destination of the PDCCH. The ID indicating the destination of the PDCCH may be the ID used for scrambling the CRC bits added to the PDCCH. The ID indicating the destination of the PDCCH is also referred to as an RNTI (Radio Network Temporary Identifier). The information related to the reception of the PDCCH may include information related to the ID used for scrambling the CRC bits added to the PDCCH. The terminal device 1 can attempt to receive the PDCCH based at least on the information related to the ID included in the PBCH.

[0129] The RNTI may include SI-RNTI (System Information - RNTI), P-RNTI (Paging - RNTI), C-RNTI (Common - RNTI), Temporary C-RNTI (TC-RNTI), RA-RNTI (Random Access - RNTI), CC-RNTI (Common Control - RNTI), and INT-RNTI (Interruption - RNTI). The SI-RNTI is at least used for scheduling the PDSCH transmitted including system information. The P-RNTI is at least used for scheduling the PDSCH transmitted including paging information and / or information such as a notification of a change in system information. The C-RNTI is at least used for scheduling user data for the RRC-connected terminal device 1. The Temporary C-RNTI is at least used for scheduling the random access message 4. The Temporary C-RNTI is at least used for scheduling the PDSCH including data mapped to the CCCH in the logical channel. The RA-RNTI is at least used for scheduling the random access message 2. The CC-RNTI is at least used for transmitting and receiving control information for unlicensed access. The INT-RNTI is at least used for indicating downlink pre-emption.

[0130] Note that the PDCCH and / or DCI included in the CSS may not include a CIF (Carrier Indicator Field) indicating for which serving cell (or which component carrier) the PDCCH / DCI is scheduling the PDSCH or PUSCH.

[0131] In addition, when carrier aggregation (CA: Carrier Aggregation) is set to aggregate a plurality of serving cells and / or a plurality of component carriers for communication (transmission and / or reception) with the terminal device 1, the PDCCH and / or DCI included in the USS for a predetermined serving cell (predetermined component carrier) may include a CIF indicating which serving cell and / or which component carrier the PDCCH / DCI is scheduling the PDSCH or PUSCH for.

[0132] In addition, when communication is performed using one serving cell and / or one component carrier for the terminal device 1, the PDCCH and / or DCI included in the USS may not include a CIF indicating which serving cell and / or which component carrier the PDCCH / DCI is scheduling the PDSCH or PUSCH for.

[0133] The common control resource set may include the CSS. The common control resource set may include both the CSS and the USS. The dedicated control resource set may include the USS. The dedicated control resource set may include the CSS.

[0134] The physical resources of the search area are composed of control channel constituent units (CCE: Control Channel Element). The CCE is composed of a predetermined number of resource element groups (REG: Resource Element Group). For example, the CCE may be composed of six REGs. The REG may be composed of one OFDM symbol of one PRB (Physical Resource Block). That is, the REG may be composed of including twelve resource elements (RE: Resource Element). The PRB is also simply referred to as an RB (Resource Block).

[0135] That is, the terminal device 1 can detect the PDCCH and / or DCI for the terminal device 1 by blindly detecting the PDCCH candidates included in the search space within the control resource set.

[0136] The number of blind detections for one control resource set in one serving cell and / or one component carrier may be determined based on the type of search space for the PDCCH included in the control resource set, the type of aggregation level, and the number of PDCCH candidates. Here, the type of search space may include at least one of CSS and / or USS and / or UGSS (UE Group SS) and / or GCSS (Group CSS). The type of aggregation level indicates the maximum aggregation level supported for the CCEs constituting the search space, and may be defined / set from at least one of {1, 2, 4, 8, …, X} (X is a predetermined value). The number of PDCCH candidates may indicate the number of PDCCH candidates for a certain aggregation level. That is, the number of PDCCH candidates may be defined / set for each of a plurality of aggregation levels. Note that UGSS may be a search space commonly allocated to one or more terminal devices 1. GCSS may be a search space to which DCI including parameters related to CSS is mapped for one or more terminal devices 1. Note that the aggregation level indicates the aggregation level of a predetermined number of CCEs and is related to the total number of CCEs constituting one PDCCH and / or search space.

[0137] Note that the size of the aggregation level may be associated with the coverage corresponding to the PDCCH and / or search space or the size of the DCI (DCI format size, payload size) included in the PDCCH and / or search space.

[0138] In addition, when the start position (start symbol) of the PDCCH symbol is set for one control resource set, and more than one PDCCH within the control resource set can be detected during a predetermined period, for the time region corresponding to each start symbol, the type of search region, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set respectively. The type of search region, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set for each control resource set respectively, may be provided / set via DCI and / or a signal from the upper layer (RRC signaling), or may be predefined / set by the specification. Note that the number of PDCCH candidates may be the number of PDCCH candidates during a predetermined period. Note that the predetermined period may be 1 millisecond. The predetermined period may be 1 microsecond. Also, the predetermined period may be the period of 1 slot. Also, the predetermined period may be the period of 1 OFDM symbol.

[0139] In addition, when there are more than one start positions (start symbols) of the PDCCH symbol for one control resource set, that is, when there are multiple timings for blind detection (monitoring) of the PDCCH during a predetermined period, for the time region corresponding to each start symbol, the type of search region, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set respectively. The type of search region, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set for each control resource set respectively, may be provided / set via DCI and / or a signal from the upper layer, or may be predefined / set by the specification.

[0140] Note that as a way of indicating the number of PDCCH candidates, a configuration may be adopted in which the number to be reduced from a predetermined number of PDCCH candidates is defined / set for each aggregation level.

[0141] The terminal device 1 may transmit / notify the base station device 3 of the capability information related to blind detection. The terminal device 1 may transmit / notify the base station device 3 of the number of PDCCH candidates that can be processed in one subframe as the capability information related to the PDCCH. If the terminal device 1 can set more control resource sets than a predetermined number for one or more serving cells / component carriers, it may transmit / notify the base station device 3 of the capability information related to blind detection.

[0142] If the terminal device 1 can set more control resource sets than a predetermined number for a predetermined period of one or more serving cells / component carriers, it may transmit / notify the base station device 3 of the capability information related to blind detection.

[0143] Note that the capability information related to the blind detection may include information indicating the maximum number of blind detections in a predetermined period. Also, the capability information related to the blind detection may include information indicating that PDCCH candidates can be reduced. Further, the capability information related to the blind detection may include information indicating the maximum number of control resource sets that can be blindly detected in a predetermined period. The maximum number of the control resource sets and the maximum number of serving cells and / or component carriers for which PDCCH monitoring is possible may be set as individual parameters or as common parameters, respectively. Also, the capability information related to the blind detection may include information indicating the maximum number of control resource sets for which blind detection can be performed simultaneously in a predetermined period.

[0144] If the terminal device 1 does not support the ability to detect (blind detect) more control resource sets than a predetermined number in a predetermined period, it may not transmit / notify the capability information related to the blind detection. If the base station device 3 does not receive the capability information related to the blind detection, it may perform settings related to the control resource set so as not to exceed a predetermined number for blind detection and transmit the PDCCH.

[0145] Settings related to the control resource set include a parameter indicating an index (ControlResourceSetId) for identifying the control resource set. Also, the settings related to the control resource set may include a parameter indicating the frequency resource region of the control resource set (the number of resource blocks constituting the control resource set). Also, the settings related to the control resource set may include a parameter indicating the type of mapping from CCE to REG. Also, the settings related to the control resource set may include the REG bundle size. RRC signaling may be used for transmitting and receiving a message indicating the settings related to the control resource set. SIB may be used for transmitting and receiving a message indicating the settings related to the control resource set. MIB may be used for transmitting and receiving a message indicating the settings related to the control resource set.

[0146] Settings related to the search area include parameters indicating an index (search area index) for identifying the search area. Settings related to the search area include parameters indicating an index of the control resource set in which the search area is located. Settings related to the search area may include parameters indicating the period and offset of the slot in which the search area is located. Settings related to the search area may include parameters indicating the number of consecutive slots in which the search area is located. Settings related to the search area may include parameters indicating the OFDM symbol in the slot in which monitoring of PDCCH candidates is performed. Settings related to the search area may include parameters indicating the number of PDCCH candidates for which monitoring is performed for each CCE aggregation level. Settings related to the search area may include parameters indicating the DCI format for which monitoring is performed. Settings related to the search area may include parameters indicating the type of the search area (CSS or USS). RRC signaling may be used for transmitting and receiving a message indicating settings related to the search area. SIB may be used for transmitting and receiving a message indicating settings related to the search area. MIB may be used for transmitting and receiving a message indicating settings related to the search area.

[0147] The PDSCH is used at least for transmitting / receiving a transport block. The PDSCH may be used at least for transmitting / receiving a random access message 2 (random access response). The PDSCH may be used at least for transmitting / receiving system information including parameters used for initial access.

[0148] In FIG. 1, in downlink wireless communication, the following downlink physical signals are used. The downlink physical signals may not be used for transmitting information output from the upper layer, but are used by the physical layer. · Synchronization signal (SS: Synchronization signal) · DL DMRS (DownLink DeModulation Reference Signal) ·CSI-RS (Channel State Information-Reference Signal) ·DL PTRS (DownLink Phase Tracking Reference Signal)

[0149] The synchronization signal is used for the terminal device 1 to synchronize in the downlink frequency domain and / or time domain. The synchronization signal includes a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal).

[0150] The SS block (SS / PBCH block) is configured to include at least a part or all of the PSS, SSS, and PBCH.

[0151] DL DMRS is related to the transmission of PBCH, PDCCH, and / or PDSCH. DL DMRS is multiplexed with PBCH, PDCCH, and / or PDSCH. The terminal device 1 may use the DL DMRS corresponding to the PBCH, the PDCCH, or the PDSCH to perform channel correction of the PBCH, the PDCCH, or the PDSCH. The terminal device 1 may determine based on the detection of the DL DMRS that the base station device 3 is transmitting a signal.

[0152] CSI-RS may be a signal used at least for calculating channel state information. The pattern of CSI-RS assumed by the terminal device 1 may be given at least by upper layer parameters.

[0153] PTRS may be a signal used at least for compensating phase noise. The pattern of PTRS assumed by the terminal device 1 may be given based at least on upper layer parameters and / or DCI.

[0154] The DL PTRS may be associated with a DL DMRS group that includes at least the antenna ports used for one or more DL DMRSs.

[0155] Note that downlink physical signals not described above may be used.

[0156] The downlink physical channel and the downlink physical signal are also referred to as the downlink signal. The uplink physical channel and the uplink physical signal are also referred to as the uplink signal. The downlink signal and the uplink signal are collectively also referred to as the physical signal. The downlink signal and the uplink signal are collectively also referred to as the signal. The downlink physical channel and the uplink physical channel are collectively referred to as the physical channel. The downlink physical signal and the uplink physical signal are collectively referred to as the physical signal.

[0157] BCH (Broadcast CHannel), UL-SCH (Uplink-Shared CHannel) and DL-SCH (Downlink-Shared CHannel) are transport channels. The channels used in the Medium Access Control (MAC) layer are referred to as transport channels. The unit of the transport channel used in the MAC layer is also referred to as a transport block (TB) or a MAC PDU. In the MAC layer, HARQ (Hybrid Automatic Repeat reQuest) control is performed for each transport block. A transport block is the unit of data that the MAC layer delivers to the physical layer. In the physical layer, the transport block is mapped to codewords, and modulation processing is performed for each codeword.

[0158] The base station device 3 and the terminal device 1 exchange (transmit and receive) higher layer signals in the higher layer. For example, the base station device 3 and the terminal device 1 may transmit and receive RRC signaling (RRC message: Radio Resource Control message; RRC information: Radio Resource Control information) in the Radio Resource Control (RRC) layer. Also, the base station device 3 and the terminal device 1 may transmit and receive MAC CE (Control Element) in the MAC layer. Here, RRC signaling and / or MAC CE are also referred to as higher layer signaling.

[0159] PUSCH and PDSCH may be used at least for transmitting RRC signaling and / or MAC CE. Here, the RRC signaling transmitted by the base station device 3 via PDSCH may be common signaling for a plurality of terminal devices 1 within the serving cell. The common signaling for a plurality of terminal devices 1 within the serving cell is also referred to as common RRC signaling. The RRC signaling transmitted by the base station device 3 via PDSCH may be dedicated signaling (also referred to as dedicated signaling or UE specific signaling) for a certain terminal device 1. The dedicated signaling for a terminal device 1 is also referred to as dedicated RRC signaling. The unique higher layer parameters in the serving cell may be transmitted / received using common signaling for a plurality of terminal devices 1 within the serving cell or dedicated signaling for a certain terminal device 1. The UE specific higher layer parameters may be transmitted / received using dedicated signaling for a certain terminal device 1.

[0160] BCCH (Broadcast Control Channel), CCCH (Common Control Channel), and DCCH (Dedicated Control Channel) are logical channels. For example, BCCH is a higher layer channel used to transmit / receive the MIB. Also, CCCH (Common Control Channel) is a higher layer channel used to transmit / receive common information among a plurality of terminal devices 1. Here, CCCH may be used, for example, for a terminal device 1 that is not RRC-connected. Also, DCCH (Dedicated Control Channel) is a higher layer channel that is at least used to transmit / receive dedicated control information for the terminal device 1. Here, DCCH may be used, for example, for a terminal device 1 that is RRC-connected.

[0161] BCCH in the logical channel may be mapped to BCH, DL-SCH, or UL-SCH in the transport channel. CCCH in the logical channel may be mapped to DL-SCH or UL-SCH in the transport channel. DCCH in the logical channel may be mapped to DL-SCH or UL-SCH in the transport channel.

[0162] UL-SCH in the transport channel may be mapped to PUSCH in the physical channel. DL-SCH in the transport channel may be mapped to PDSCH in the physical channel. BCH in the transport channel may be mapped to PBCH in the physical channel.

[0163] FIG. 5 is a diagram showing an example of the configuration of one REG according to an aspect of the present embodiment. The REG may be composed of one OFDM symbol of one PRB. That is, the REG may be composed of 12 consecutive REs in the frequency domain. A part of the plurality of REs constituting the REG may be REs to which downlink control information is not mapped. The REG may be configured to include REs to which downlink control information is not mapped, or may be configured without including REs to which downlink control information is not mapped. The RE to which downlink control information is not mapped may be an RE to which a reference signal is mapped, an RE to which a channel other than the control channel is mapped, or an RE assumed by the terminal device 1 to which the control channel is not mapped.

[0164] FIG. 6 is a diagram showing an example of the configuration of a CCE according to an aspect of the present embodiment. The CCE may be composed of six REGs. As shown in FIG. 6(a), the CCE (CCE#0) may be composed of REGs that are mapped continuously (such a mapping may be referred to as Localized mapping) (such a mapping may be referred to as non-interleaved CCE-to-REG mapping) (such a mapping may be referred to as non-interleaved mapping). Note that not all of the REGs constituting the CCE necessarily need to be continuous in the frequency domain. For example, when all of the plurality of resource blocks constituting the control resource set are not continuous in the frequency domain, even if the numbers assigned to the REGs are continuous, each resource block constituting each of the consecutive numbered REGs is not continuous in the frequency domain. When the control resource set is composed of a plurality of OFDM symbols and the plurality of REGs constituting one CCE are arranged over a plurality of time intervals (OFDM symbols), as shown in FIG. 6(b), the CCE (CCE#1) may be composed of a group of REGs that are mapped continuously.

[0165] As shown in Fig. 6(c), a CCE (CCE#2) may be composed of REGs mapped discontinuously (such a mapping may be referred to as Distributed mapping) (such a mapping may be referred to as interleaved CCE-to-REG mapping) (such a mapping may be referred to as interleaved mapping). REGs constituting a CCE may be mapped discontinuously to resources in the time-frequency domain using an interleaver. When a control resource set is composed of a plurality of OFDM symbols and a plurality of REGs constituting one CCE are arranged over a plurality of time intervals (OFDM symbols), as shown in Fig. 6(d), a CCE (CCE#3) may be composed of REGs mapped discontinuously with REGs in different time intervals (OFDM symbols) being mixed. As shown in Fig. 6(e), a CCE (CCE#4) may be composed of REGs mapped dispersedly in units of a group of a plurality of REGs. As shown in Fig. 6(f), a CCE (CCE#5) may be composed of REGs mapped dispersedly in units of a group of a plurality of REGs.

[0166] Fig. 7 is a diagram showing an example of REGs constituting a PDCCH candidate and the number of REGs constituting a group of REGs according to one aspect of this embodiment. In an example shown in Fig. 7(a), a PDCCH candidate is mapped to one OFDM symbol, and three REG groups each including two REGs are configured. That is, in the example shown in Fig. 7(a), one REG group is composed of two REGs. The number of REGs constituting a REG group in the frequency domain may include a divisor of the number of PRBs mapped in the frequency direction. In the example shown in Fig. 7(a), the number of REGs constituting a REG group in the frequency domain may be 1, 2, 3, or 6.

[0167] In an example shown in FIG. 7(b), the PDCCH candidates are mapped to two OFDM symbols, and three groups of REGs each including two REGs are configured. In an example shown in FIG. 7(b), the number of REGs constituting the group of REGs in the frequency domain may be either 1 or 3.

[0168] Hereinafter, a configuration example of the terminal device 1 according to one aspect of the present embodiment will be described.

[0169] FIG. 8 is a schematic block diagram showing the configuration of the terminal device 1 according to one aspect of the present embodiment. As shown in the figure, the terminal device 1 includes a radio transmission / reception unit 10 and an upper layer processing unit 14. The radio transmission / reception unit 10 is configured to include at least a part or all of an antenna unit 11, an RF (Radio Frequency) unit 12, and a baseband unit 13. The upper layer processing unit 14 is configured to include at least a part or all of a medium access control layer processing unit 15 and a radio resource control layer processing unit 16. The radio transmission / reception unit 10 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

[0170] The physical layer processing unit includes a decoding unit. The reception unit (also referred to as a reception processing unit) of the terminal device 1 receives a PDCCH. The decoding unit of the terminal device 1 decodes the received PDCCH. More specifically, the decoding unit of the terminal device 1 performs blind decoding processing on the received signal of the resource corresponding to the PDCCH candidate of the USS. The decoding unit of the terminal device 1 performs brand decoding processing on the received signal of the resource corresponding to the PDCCH candidate of the CSS. The reception processing unit of the terminal device 1 monitors PDCCH candidates within the control resource set. The reception processing unit of the terminal device 1 monitors PDCCH candidates within the control resource set.

[0171] The receiving processing unit of the terminal device 1 monitors PDCCH candidates within the control resource set of the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3A. The receiving processing unit of the terminal device 1 monitors PDCCH candidates within the control resource set of the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3B. The receiving unit of the terminal device 1 receives the PDSCH. The receiving processing unit of the terminal device 1 performs a process of receiving the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3A. The receiving processing unit of the terminal device 1 performs a process of receiving the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3B. The receiving processing unit of the terminal device 1 performs processes such as demodulation and decoding on the PDSCH.

[0172] The transmission unit (also referred to as the transmission processing unit) of the terminal device 1 transmits HARQ-ACK. The transmission processing unit of the terminal device 1 transmits HARQ-ACK for the PDSCH. The transmission processing unit of the terminal device 1 transmits HARQ-ACK in the uplink frequency band (cell, component carrier, carrier) managed by the base station device 3A. The transmission processing unit of the terminal device 1 transmits HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3A and HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3B. The transmission processing unit of the terminal device 1 transmits HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3A and HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3B in the uplink frequency band (cell, component carrier, carrier) managed by the base station device 3A. The transmission processing unit of the terminal device 1 transmits HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3A by a first method and transmits HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3B by a second method.

[0173] The upper layer processing unit 14 outputs uplink data (transport block) generated by a user's operation or the like to the radio transceiver unit 10. The upper layer processing unit 14 performs processing of the MAC layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the RRC layer.

[0174] The media access control layer processing unit 15 included in the upper layer processing unit 14 performs MAC layer processing.

[0175] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs RRC layer processing. The radio resource control layer processing unit 16 manages various setting information / parameters of its own device. The radio resource control layer processing unit 16 sets various setting information / parameters based on the upper layer signals received from the base station device 3. That is, the radio resource control layer processing unit 16 sets various setting information / parameters based on the information indicating various setting information / parameters received from the base station device 3. Note that the setting information may include information related to the processing or setting of the physical channel, physical signal (i.e., physical layer), MAC layer, PDCP layer, RLC layer, and RRC layer. The parameter may be an upper layer parameter.

[0176] The radio resource control layer processing unit 16 sets a control resource set based on the RRC signaling received from the base station device 3. The radio resource control layer processing unit 16 sets a search area within the control resource set. The radio resource control layer processing unit 16 sets the PDCCH candidates to be monitored within the control resource set. The radio resource control layer processing unit 16 sets the number of PDCCH candidates to be monitored within the control resource set. The radio resource control layer processing unit 16 sets the Aggregation level of the PDCCH candidates to be monitored within the control resource set.

[0177] The radio transceiver unit 10 performs physical layer processing such as modulation, demodulation, encoding, and decoding. The radio transceiver unit 10 separates, demodulates, and decodes the received physical signal, and outputs the decoded information to the upper layer processing unit 14. The radio transceiver unit 10 generates a physical signal by modulating, encoding, and generating a baseband signal (converting to a time-continuous signal) the data, and transmits it to the base station device 3.

[0178] The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal by quadrature demodulation (down convert), and removes unnecessary frequency components. The RF unit 12 outputs the processed analog signal to the baseband unit.

[0179] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes the portion corresponding to the CP (Cyclic Prefix) from the converted digital signal, performs a fast Fourier transform (FFT) on the signal with the CP removed, and extracts the signal in the frequency domain.

[0180] The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the data to generate an OFDM symbol, adds a CP to the generated OFDM symbol to generate a baseband digital signal, and converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[0181] The RF unit 12 uses a low-pass filter to remove extra frequency components from the analog signal input from the baseband unit 13, up-converts the analog signal to the carrier frequency, and transmits it via the antenna unit 11. Also, the RF unit 12 amplifies the power. Further, the RF unit 12 may have a function of controlling the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0182] The terminal device 1 receives the PDCCH. The terminal device 1 receives the PDSCH. The radio resource control layer processing unit 16 sets a control resource set. The radio resource control layer processing unit 16 sets a search area. The radio resource control layer processing unit 16 sets a control resource set based on RRC signaling. The radio resource control layer processing unit 16 sets a search area based on RRC signaling. The receiving unit of the terminal device 1 monitors a plurality of PDCCH candidates within the search area of the set control resource set. The receiving unit of the terminal device 1 monitors a plurality of PDCCH candidates within the search area of the set control resource set in a certain slot. The decoding unit of the terminal device 1 decodes the monitored PDCCH candidates. The decoding unit of the terminal device 1 decodes the received PDSCH.

[0183] The receiving unit of the terminal device 1 monitors a set number of PDCCH candidates based on RRC signaling within the search area of the control resource set in a certain slot. The receiving unit of the terminal device 1 monitors PDCCH candidates composed of one or more OFDM symbols set based on RRC signaling within the search area of the control resource set in a certain slot. The receiving unit of the terminal device 1 monitors PDCCH candidates in the search area of the first half of a certain slot (for example, the first OFDM symbol, or the first and second OFDM symbols, or the first, second, and third OFDM symbols). The receiving unit of the terminal device 1 monitors PDCCH candidates in the search area of the first half of a certain slot (for example, the first OFDM symbol, or the first and second OFDM symbols, or the first, second, and third OFDM symbols), and monitors PDCCH candidates in the search area of the second half of the slot (for example, the eighth OFDM symbol, or the eighth and ninth OFDM symbols, or the eighth, ninth, and tenth OFDM symbols). Note that the receiving unit of the terminal device 1 may set three or more search areas that are search areas of different OFDM symbols in a certain slot, and further monitor PDCCH candidates dispersed within the slot.

[0184] Hereinafter, a configuration example of the base station device 3 according to one aspect of the present embodiment will be described.

[0185] FIG. 5 is a schematic block diagram showing the configuration of the base station device 3 according to one aspect of the present embodiment. As shown in the figure, the base station device 3 includes a radio transceiver unit 30 and an upper layer processing unit 34. The radio transceiver unit 30 includes an antenna unit 31, an RF unit 32, and a baseband unit 33. The upper layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The radio transceiver unit 30 is also referred to as a transmitting unit, a receiving unit, or a physical layer processing unit.

[0186] The upper layer processing unit 34 performs processing of the MAC layer, PDCP layer, RLC layer, and RRC layer.

[0187] The Medium Access Control Layer Processing Unit 35 included in the Upper Layer Processing Unit 34 performs the processing of the MAC layer.

[0188] The Radio Resource Control Layer Processing Unit 36 included in the Upper Layer Processing Unit 34 performs the processing of the RRC layer. The Radio Resource Control Layer Processing Unit 36 generates, or obtains from a higher node, downlink data (transport block), system information, RRC messages, MAC CE, etc. arranged in the PDSCH, and outputs them to the Radio Transceiver Unit 30. Further, the Radio Resource Control Layer Processing Unit 36 manages various setting information / parameters of each of the terminal devices 1. The Radio Resource Control Layer Processing Unit 36 may set various setting information / parameters for each of the terminal devices 1 via a signal from the upper layer. That is, the Radio Resource Control Layer Processing Unit 36 transmits / informs information indicating various setting information / parameters. Note that the setting information may include information related to the processing or setting of a physical channel or a physical signal (i.e., the physical layer), the MAC layer, the PDCP layer, the RLC layer, and the RRC layer. The parameter may be an upper layer parameter.

[0189] The Radio Resource Control Layer Processing Unit 36 sets a control resource set for the terminal device 1. A plurality of PDCCH candidates are configured (set) within the set control resource set. The Radio Resource Control Layer Processing Unit 36 sets a search area for the terminal device 1.

[0190] The Radio Resource Control Layer Processing Unit 36 sets a resource for transmitting HARQ-ACK for the terminal device 1. The Radio Resource Control Layer Processing Unit 36 of the base station device 3A sets a resource for transmitting HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3B. The Radio Resource Control Layer Processing Unit 36 of the base station device 3A sets a resource for transmitting HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3B in the uplink frequency band (cell, component carrier, carrier) managed by the base station device 3A.

[0191] Since the functions of the wireless transceiver unit 30 are the same as those of the wireless transceiver unit 10, the description will be omitted as appropriate. Also, the wireless transceiver unit 30 grasps the SS (Search space) configured in the terminal device 1. The wireless transceiver unit 30 grasps the search area within the control resource set configured in the terminal device 1. The wireless transceiver unit 30 grasps the PDCCH candidates monitored in the terminal device 1 to grasp the search area. The wireless transceiver unit 30 grasps which control channel elements each PDCCH candidate monitored in the terminal device 1 is composed of (grasps the numbers of the control channel elements that make up the PDCCH candidate). The wireless transceiver unit 30 includes an SS grasping unit, and the SS grasping unit grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates within the control resource set configured as the Search space of the terminal device. The SS grasping unit grasps the PDCCH candidates (the number of PDCCH candidates, the numbers of the PDCCH candidates) configured in the search area of the control resource set of the terminal device 1.

[0192] The SS grasping unit grasps the configuration of the search area within the control resource set (the number of PDCCH candidates, the OFDM symbols of the PDCCH candidates, the Aggregation level of the PDCCH candidates). The transmission unit of the wireless transceiver unit 30 transmits a PDCCH to the terminal device 1 using the PDCCH candidates within the search area of the control resource set.

[0193] The SS grasping unit may grasp that, as the configuration of the search area of a certain slot, one or more PDCCH candidates are composed of OFDM symbols in the first half of the slot (for example, the first OFDM symbol, or the first and second OFDM symbols, or the first, second, and third OFDM symbols). The SS grasping unit may grasp that, as the configuration of the search area of a certain slot, one or more PDCCH candidates are composed of OFDM symbols in the first half of the slot (for example, the first OFDM symbol, or the first and second OFDM symbols, or the first, second, and third OFDM symbols), and one or more PDCCH candidates are composed of OFDM symbols in the second half of the slot (for example, the eighth OFDM symbol, or the eighth and ninth OFDM symbols, or the eighth, ninth, and tenth OFDM symbols). Note that the SS grasping unit may grasp that, in a certain slot, the search areas are each in a different OFDM symbol, and three or more search areas are configured.

[0194] The receiving unit (also referred to as the reception processing unit) of the base station apparatus 3 receives HARQ-ACK. The reception processing unit of the base station apparatus 3 receives HARQ-ACK for the PDSCH. The reception processing unit of the base station apparatus 3 (base station apparatus 3A) receives HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The reception processing unit of the base station apparatus 3A receives HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station apparatus 3A and HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station apparatus 3B. The reception processing unit of the base station apparatus 3A receives HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station apparatus 3A and HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station apparatus 3B in the uplink frequency band (cell, component carrier, carrier) managed by the base station apparatus 3A. The reception processing unit of the base station apparatus 3A receives HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station apparatus 3A by a first method and receives HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station apparatus 3B by a second method.

[0195] Each of the parts of the terminal device 1 with codes 10 to 16 attached may be configured as a circuit. Each of the parts of the base station apparatus 3 with codes 30 to 36 attached may be configured as a circuit.

[0196] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex and transmit the UCI on the PUCCH. The terminal device 1 may multiplex and transmit the UCI on the PUSCH. The UCI may include at least one of downlink channel state information (CSI), a scheduling request (SR) indicating a request for PUSCH resources, and HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0197] The HARQ-ACK may also be referred to as ACK / NACK, HARQ feedback, HARQ-ACK feedback, HARQ response, HARQ-ACK response, HARQ information, HARQ-ACK information, HARQ control information, and HARQ-ACK control information.

[0198] When the downlink data is successfully decoded, an ACK for the downlink data is generated. When the downlink data fails to be successfully decoded, a NACK for the downlink data is generated. The HARQ-ACK may at least include HARQ-ACK bits corresponding to at least one transport block. The HARQ-ACK bits may indicate an ACK (Acknowledgement) or a NACK (Negative-Acknowledgement) corresponding to one or more transport blocks. The HARQ-ACK may at least include a HARQ-ACK codebook including one or more HARQ-ACK bits. That the HARQ-ACK bits correspond to one or more transport blocks may mean that the HARQ-ACK bits correspond to a PDSCH including the one or more transport blocks.

[0199] The HARQ control for one transport block may be called a HARQ process. One HARQ process identifier may be given for each HARQ process. The DCI format includes a field indicating the HARQ process identifier.

[0200] For each HARQ process, an NDI (New Data Indicator) is indicated by a DCI format. For example, a DCI format (DL assignment) including scheduling information of PDSCH includes an NDI field. The NDI field is 1 bit. The terminal device 1 stores (remembers) the value of NDI for each HARQ process. The base station device 3 stores (remembers) the value of NDI for each HARQ process for each terminal device 1. The terminal device 1 updates the value of NDI stored using the NDI field of the detected DCI format. The base station device 3 sets the updated value of NDI, or the value of NDI that is not updated, in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 updates the value of NDI stored using the NDI field of the detected DCI format for the HARQ process corresponding to the value of the HARQ process identifier field of the detected DCI format.

[0201] The terminal device 1 determines whether the received transport block is a new transmission or a retransmission based on the value of the NDI field in the DCI format (DL assignment). The terminal device 1 compares the value of the NDI field of the detected DCI format with the previously received NDI value for the transport block of a certain HARQ process. If the value of the NDI field of the detected DCI format is toggled, the terminal device 1 determines that the received transport block is a new transmission. When the base station device 3 transmits a new transmission transport block in a certain HARQ process, it toggles the value of the NDI stored for the HARQ process and transmits the toggled NDI to the terminal device 1. When the base station device 3 transmits a retransmission transport block in a certain HARQ process, it does not toggle the value of the NDI stored for the HARQ process and transmits the non-toggled NDI to the terminal device 1. The terminal device 1 compares the value of the NDI field of the detected DCI format with the previously received NDI value for the transport block of a certain HARQ process. If the value of the NDI field of the detected DCI format is not toggled (if it is the same), the terminal device 1 determines that the received transport block is a retransmission. Here, toggling means switching to a different value.

[0202] The terminal device 1 may report HARQ-ACK information to the base station device 3 using the HARQ-ACK codebook in the slot indicated by the value of the HARQ indication field included in DCI format 1_0 or DCI format 1_1 corresponding to PDSCH reception. The terminal device 1 may report HARQ-ACK information to the base station device 3A using the HARQ-ACK codebook in the slot indicated by the value of the HARQ indication field included in DCI format 1_0 or DCI format 1_1 corresponding to PDSCH reception by the base station device 3A.

[0203] For DCI format 1_0, the value of the HARQ indication field may be mapped to a set of slot numbers (1, 2, 3, 4, 5, 6, 7, 8). For DCI format 1_1, the value of the HARQ indication field may be mapped to a set of slot numbers given by the upper layer parameter dl-DataToUL-ACK. The slot number indicated based at least on the value of the HARQ indication field may also be referred to as HARQ-ACK timing, or K1. For example, the HARQ-ACK indicating the decoding state of the PDSCH (downlink data) transmitted in slot n may be reported (transmitted) in slot n+K1.

[0204] dl-DataToUL-ACK indicates a list of timings of HARQ-ACK for the PDSCH. The timing is the number of slots between the slot in which the PDSCH is received (or the slot including the last OFDM symbol to which the PDSCH is mapped) and the slot in which the HARQ-ACK for the received PDSCH is transmitted. For example, dl-DataToUL-ACK is a list of 1, or 2, or 3, or 4, or 5, or 6, or 7, or 8 timings. When dl-DataToUL-ACK is a list of 1 timing, the HARQ indication field is 0 bits. When dl-DataToUL-ACK is a list of 2 timings, the HARQ indication field is 1 bit. When dl-DataToUL-ACK is a list of 3 or 4 timings, the HARQ indication field is 2 bits. When dl-DataToUL-ACK is a list of 5, or 6, or 7, or 8 timings, the HARQ indication field is 3 bits. For example, dl-DataToUL-ACK is composed of a list of timings of any value in the range from 0 to 31. For example, dl-DataToUL-ACK is composed of a list of timings of any value in the range from 0 to 63.

[0205] The size of dl-DataToUL-ACK is defined by the number of elements included in dl-DataToUL-ACK. The size of dl-DataToUL-ACK may be referred to as L para The index of dl-DataToUL-ACK indicates the order (number) of the elements of dl-DataToUL-ACK. For example, when the size of dl-DataToUL-ACK is 8 (L para = 8), the index of dl-DataToUL-ACK is any value of 1, 2, 3, 4, 5, 6, 7, or 8. The index of dl-DataToUL-ACK may be given, or indicated, or instructed by the value indicated by the HARQ indication field.

[0206] The terminal device 1 may set the size of the HARQ-ACK codebook according to the size of dl-DataToUL-ACK. For example, when dl-DataToUL-ACK consists of 8 elements, the size of the HARQ-ACK codebook is 8. For example, when dl-DataToUL-ACK consists of 2 elements, the HARQ-ACK codebook size is 2. Each HARQ-ACK information constituting the HARQ-ACK codebook is the HARQ-ACK information for PDSCH reception at each slot timing of dl-DataToUL-ACK. This type of HARQ-ACK codebook is also referred to as a Semi-static HARQ-ACK codebook.

[0207] An example of the setting of the HARQ indication field will be described. For example, dl-DataToUL-ACK is composed of a list of 8 timings: 0, 7, 15, 23, 31, 39, 47, 55, and the HARQ indication field is composed of 3 bits. When the HARQ indication field is "000", it corresponds to the first 0 in the list of dl-DataToUL-ACK as the corresponding timing. That is, when the HARQ indication field is "000", it corresponds to the value 0 indicated by the index 1 of dl-DataToUL-ACK. When the HARQ indication field is "001", it corresponds to the second 7 in the list of dl-DataToUL-ACK as the corresponding timing. When the HARQ indication field is "010", it corresponds to the third 15 in the list of dl-DataToUL-ACK as the corresponding timing. When the HARQ indication field is "011", it corresponds to the fourth 23 in the list of dl-DataToUL-ACK as the corresponding timing. When the HARQ indication field is "100", it corresponds to the fifth 31 in the list of dl-DataToUL-ACK as the corresponding timing. When the HARQ indication field is "101", it corresponds to the sixth 39 in the list of dl-DataToUL-ACK as the corresponding timing. When the HARQ indication field is "110", it corresponds to the seventh 47 in the list of dl-DataToUL-ACK as the corresponding timing. When the HARQ indication field is "111", it corresponds to the eighth 55 in the list of dl-DataToUL-ACK as the corresponding timing. When the received HARQ indication field indicates "000", the terminal device 1 transmits the corresponding HARQ-ACK in the 0th slot from the slot of the received PDSCH. When the received HARQ indication field indicates "001", the terminal device 1 transmits the corresponding HARQ-ACK in the 7th slot from the slot of the received PDSCH. When the received HARQ indication field indicates "010", the terminal device 1 transmits the corresponding HARQ-ACK in the 15th slot from the slot of the received PDSCH. When the received HARQ indication field indicates "011", the terminal device 1 transmits the corresponding HARQ-ACK in the 23rd slot from the slot of the received PDSCH.When the received HARQ indication field indicates "100", the terminal device 1 transmits the corresponding HARQ-ACK in the 31st slot from the slot of the received PDSCH. When the received HARQ indication field indicates "101", the terminal device 1 transmits the corresponding HARQ-ACK in the 39th slot from the slot of the received PDSCH. When the received HARQ indication field indicates "110", the terminal device 1 transmits the corresponding HARQ-ACK in the 47th slot from the slot of the received PDSCH. When the received HARQ indication field indicates "111", the terminal device 1 transmits the corresponding HARQ-ACK in the 55th slot from the slot of the received PDSCH.

[0208] When the upper layer parameter pdsch-AggregationFactor is given to the terminal device 1, N PDSCH repeat may be the value of pdsch-AggregationFactor. When the upper layer parameter pdsch-AggregationFactor is not given to the terminal device 1, N PDSCH repeat may be 1. The terminal device 1 may report HARQ-ACK information for PDSCH reception from slot n-N PDSCH repeat +1 to slot n using PUCCH transmission and / or PUSCH transmission in slot n+k. Here, k may be the number of slots indicated by the HARQ indication field included in the DCI format corresponding to the PDSCH reception. Also, when the HARQ indication field is not included in the DCI format, k may be given by the upper layer parameter dl-DataToUL-ACK.

[0209] When the terminal device 1 is configured to monitor a PDCCH including DCI format 1_0 and not configured to monitor a PDCCH including DCI format 1_1, the HARQ-ACK timing value K1 may be part or all of (1, 2, 3, 4, 5, 6, 7, 8). When the terminal device 1 is configured to monitor a PDCCH including DCI format 1_1, the HARQ-ACK timing value K1 may be given by the upper layer parameter dl-DataToUL-ACK.

[0210] The terminal device 1 determines a set of multiple opportunities for one or more candidate PDSCH receptions, where the corresponding HARQ-ACK information is transmitted on the PUCCH of a certain slot. The terminal device 1 determines multiple slots of the slot timing K1 included in dl-DataToUL-ACK as multiple opportunities for candidate PDSCH receptions. K1 may be a set of k. For example, when dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), on the PUCCH of slot n, HARQ-ACK information for the PDSCH reception of slot n-1, the PDSCH reception of slot n-2, the PDSCH reception of slot n-3, the PDSCH reception of slot n-4, the PDSCH reception of slot n-5, the PDSCH reception of slot n-6, the PDSCH reception of slot n-7, and the PDSCH reception of slot n-8 is transmitted. When the terminal device 1 actually receives a PDSCH in a slot corresponding to a candidate PDSCH reception, it sets ACK or NACK as HARQ-ACK information based on the transport block included in the PDSCH, and when it does not receive a PDSCH in a slot corresponding to a candidate PDSCH reception, it sets NACK as HARQ-ACK information.

[0211] The HARQ indication field included in the DCI format received by the PDCCH of the n-1 slot indicates 1. The HARQ indication field included in the DCI format received by the PDCCH of the n-2 slot indicates 2. The HARQ indication field included in the DCI format received by the PDCCH of the n-3 slot indicates 3. The HARQ indication field included in the DCI format received by the PDCCH of the n-4 slot indicates 4. The HARQ indication field included in the DCI format received by the PDCCH of the n-5 slot indicates 5. The HARQ indication field included in the DCI format received by the PDCCH of the n-6 slot indicates 6. The HARQ indication field included in the DCI format received by the PDCCH of the n-7 slot indicates 7. The HARQ indication field included in the DCI format received by the PDCCH of the n-8 slot indicates 8.

[0212] The terminal device 1 determines a set of a slot in which a PDCCH is received, a slot in which HARQ-ACK information is transmitted based on the value of the HARQ indication field included in the received DCI format, and slots of a plurality of candidate PDSCH receptions corresponding to the HARQ-ACK information. For example, when dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), assume that the terminal device 1 receives a PDCCH in slot m and the HARQ indication field included in the DCI format indicates 4. The terminal device 1 determines that it transmits HARQ-ACK information in slot (m + 4). The terminal device 1 determines that other HARQ-ACK information transmitted in slot (m + 4) is HARQ-ACK information for the PDSCH reception in slot (m+(1 - 4)), HARQ-ACK information for the PDSCH reception in slot (m+(2 - 4)), HARQ-ACK information for the PDSCH reception in slot (m+(3 - 4)), HARQ-ACK information for the PDSCH reception in slot (m+(5 - 4)), HARQ-ACK information for the PDSCH reception in slot (m+(6 - 4)), HARQ-ACK information for the PDSCH reception in slot (m+(7 - 4)), and HARQ-ACK information for the PDSCH reception in slot (m+(8 - 4)).

[0213] dl-DataToUL-ACK may be configured not only with a value indicating the number of slots as the timing of HARQ-ACK but also with a value (information) indicating holding HARQ-ACK. When the terminal device 1 receives a HARQ indication field indicating a value indicating holding HARQ-ACK in a PDCCH, it holds HARQ-ACK (HARQ-ACK information) for the PDSCH scheduled by the PDCCH and waits for transmission of the HARQ-ACK (HARQ-ACK information).

[0214] In the above, as the type of the HARQ-ACK codebook, the Semi-static HARQ-ACK codebook has been described, but different types of HARQ-ACK codebooks may be used. A type of HARQ-ACK codebook called the Dynamic HARQ-ACK codebook will be described.

[0215] The HARQ-ACK codebook corresponding to a certain PDSCH group is given based on one or more HARQ-ACK bits corresponding to any one of one or more transport blocks included in any one of one or more PDSCHs included in the certain PDSCH group. The HARQ-ACK codebook is given based at least on a set of monitoring occasions for PDCCH and a part or all of the value of the counter DAI field. The HARQ-ACK codebook may be further given based on the value of the UL DAI field., The HARQ-ACK codebook may be further given based on the value of the DAI field. The HARQ-ACK codebook may be further given based on the value of the total DAI field.

[0216] The HARQ-ACK codebook size of the Dynamic HARQ-ACK codebook is based on the fields of the DCI format. The size of the HARQ-ACK codebook may be set based on the value of the counter DAI field of the last received DCI format. The counter DAI field indicates the cumulative number of PDSCHs or transport blocks scheduled up to the reception of the corresponding DCI format. The size of the HARQ-ACK codebook may be set based on the value of the total DAI field of the DCI format. The total DAI field indicates the total number of PDSCHs or transport blocks scheduled up to the transmission of the HARQ-ACK codebook.

[0217] The terminal device 1 may determine a set of monitoring opportunities for PDCCH for HARQ-ACK information transmitted in the PUCCH arranged in the slot (slot#n) of index n, based at least in part on the value of timing K1 and part or all of the value of slot offset K0. The set of monitoring opportunities for PDCCH for HARQ-ACK information transmitted in the PUCCH arranged in the slot of index n is also referred to as the set of monitoring opportunities for PDCCH for slot#n. Here, the set of monitoring opportunities for PDCCH includes M monitoring opportunities for PDCCH. For example, the slot offset K0 may be indicated based at least on the value of the time domain resource allocation field included in the downlink DCI format. The slot offset K0 is a value indicating the number of slots (slot difference) from the slot including the last OFDM symbol in which the PDCCH including the DCI format including the time domain resource allocation field indicating the slot offset K0 is arranged to the first OFDM symbol of the PDSCH scheduled by the DCI format.

[0218] When the DCI format detected in the monitoring opportunity of any search region set corresponding to a monitoring opportunity of a certain PDCCH triggers (including the information for triggering) the transmission of HARQ-ACK information in slot n, the terminal device 1 may determine the monitoring opportunity of the PDCCH as the monitoring opportunity for PDCCH for slot n. Also, when the DCI format detected in the monitoring opportunity of any search region set corresponding to a monitoring opportunity of a certain PDCCH does not trigger (does not include the information for triggering) the transmission of HARQ-ACK information in slot n, the terminal device 1 may not determine the monitoring opportunity of the PDCCH as the monitoring opportunity for PDCCH for slot n. Also, when no DCI format is detected in the monitoring opportunity of any search region set corresponding to a monitoring opportunity of a certain PDCCH, the terminal device 1 may not determine the monitoring opportunity of the PDCCH as the monitoring opportunity for PDCCH for slot n.

[0219] The PUCCH resource used for transmitting HARQ-ACK information in slot n may be specified based at least on the PUCCH resource indication field included in the last DCI format among one or more DCI formats detected in the set of PDCCH monitoring opportunities for that slot n. Here, each of the one or more DCI formats triggers the transmission of HARQ-ACK information in slot n. The last DCI format may be the DCI format corresponding to the last index (the largest index) among the DCI formats detected in the set of PDCCH monitoring opportunities for that slot n. The index of the DCI format in the set of PDCCH monitoring opportunities for that slot n is given in ascending order with respect to the index of the serving cell in which the DCI format is detected, and then in ascending order with respect to the index of the PDCCH monitoring opportunity in which the DCI format is detected. The index of the PDCCH monitoring opportunity is given in ascending order on the time axis.

[0220] Counter DAI (Counter Downlink Assignment Index) indicates, in M PDCCH monitoring opportunities, for a certain PDCCH monitoring opportunity in a certain serving cell, the cumulative number of PDCCHs detected up to that PDCCH monitoring opportunity in that serving cell (or a value at least related to the cumulative number). Counter DAI may also be referred to as C-DAI. The C-DAI corresponding to the PDSCH may be indicated by a field included in the DCI format used for scheduling that PDSCH. Total DAI may indicate, in M PDCCH monitoring opportunities, the cumulative number of PDCCHs detected up to PDCCH monitoring opportunity m (or a value at least related to the cumulative number). Total DAI may be referred to as T-DAI (Total Downlink Assignment Index).

[0221] The Semi-static HARQ-ACK codebook (Type 1 HARQ-ACK codebook) or the Dynamic HARQ-ACK codebook (Type 2 HARQ-ACK codebook) is a HARQ-ACK codebook whose transmission is indicated (triggered, requested) based on a DL assignment. The DCI format including the HARQ indication field is a DL assignment (Downlink assignment). The DL assignment is a DCI format used for scheduling the PDSCH. The DL assignment is a DCI format used for allocating the PDSCH. The Semi-static HARQ-ACK codebook is configured based on the dl-DataToUL-ACK and the HARQ indication field. The size of the Semi-static HARQ-ACK codebook is based on the size included in the dl-DataToUL-ACK. The timing of the slot included in the Semi-static HARQ-ACK codebook or the Dynamic HARQ-ACK codebook is based on the value of the HARQ indication field and the slot in which the DCI including the HARQ indication field is received.

[0222] The Dynamic HARQ-ACK codebook or the Semi-static HARQ-ACK codebook is the first method for transmitting and receiving HARQ-ACK. The first method is used for transmitting and receiving HARQ-ACK for the PDSCH of the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3A. The second method is used for transmitting and receiving HARQ-ACK for the PDSCH of the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3B.

[0223] The HARQ-ACK codebook of the second method includes HARQ-ACK information for a plurality of or all HARQ processes. For example, the HARQ process means the HARQ process used for PDSCH. For example, all HARQ processes mean all HARQ processes that can be used in at least one Serving cell (a downlink cell managed by the base station device 3B). For example, the number of HARQ processes that can be used in one Serving cell is 16. For example, a plurality of HARQ processes mean a plurality of HARQ processes configured by RRC signaling. For example, the number of a plurality of HARQ processes is 8. For example, the number of a plurality of HARQ processes is 10.

[0224] An example of the HARQ-ACK codebook for the second method will be described. A case where HARQ-ACK for 8 HARQ processes (HARQ process 0, HARQ process 1, HARQ process 2, HARQ process 3, HARQ process 4, HARQ process 5, HARQ process 6, HARQ process 7) is configured will be described. When one transport block is transmitted and received for each HARQ process in the downlink cell of the base station apparatus 3B, 1-bit HARQ-ACK is used for each HARQ process. One HARQ-ACK codebook is configured by a total of 8 bits of 1-bit HARQ-ACK for HARQ process 0, 1-bit HARQ-ACK for HARQ process 1, 1-bit HARQ-ACK for HARQ process 2, 1-bit HARQ-ACK for HARQ process 3, 1-bit HARQ-ACK for HARQ process 4, 1-bit HARQ-ACK for HARQ process 5, 1-bit HARQ-ACK for HARQ process 6, and 1-bit HARQ-ACK for HARQ process 7. When two transport blocks are transmitted and received for each HARQ process in the downlink cell of the base station apparatus 3B, 2-bit HARQ-ACK is used for each HARQ process. One HARQ-ACK codebook is configured by a total of 16 bits of 2-bit HARQ-ACK for HARQ process 0, 2-bit HARQ-ACK for HARQ process 1, 2-bit HARQ-ACK for HARQ process 2, 2-bit HARQ-ACK for HARQ process 3, 2-bit HARQ-ACK for HARQ process 4, 2-bit HARQ-ACK for HARQ process 5, 2-bit HARQ-ACK for HARQ process 6, and 2-bit HARQ-ACK for HARQ process 7.The configured HARQ-ACK codebook is transmitted from the terminal device 1 in the uplink cell of the base station device 3A.

[0225] The first method can be said to be a method in which the time resource (slot) used for HARQ-ACK transmission is dynamically notified by DCI format. The second method can be said to be a method in which the time resource (slot) used for HARQ-ACK transmission is semi-statically notified by RRC signaling. The first method can be said to be a method in which the time resource (slot) used for HARQ-ACK transmission is aperiodic. The second method can be said to be a method in which the time resource (slot) used for HARQ-ACK transmission is periodic. In the second method, the time resource (slot) used for HARQ-ACK transmission may be static.

[0226] The first method can be said to be a method in which the frequency resource (physical channel) used for HARQ-ACK transmission is dynamically notified by DCI format. The second method can be said to be a method in which the frequency resource (physical channel) used for HARQ-ACK transmission is semi-statically notified by RRC signaling.

[0227] The first method can be said to be a HARQ-ACK codebook in which the relationship between the slot in which the HARQ-ACK codebook is transmitted and received and the slot of the PDSCH to which the HARQ-ACK included in the HARQ-ACK codebook corresponds is defined. The HARQ process used for the PDSCH corresponding to the HARQ-ACK included in the HARQ-ACK codebook of the first method is not limited in advance and is set by the scheduling of the base station device 3. The HARQ-ACK codebook of the second method can be said to be a HARQ-ACK codebook in which the HARQ process of the PDSCH to which the HARQ-ACK included in the HARQ-ACK codebook corresponds is defined.

[0228] For example, as the frequency resource used for transmission and reception of the HARQ-ACK codebook of the second method, the frequency resource every 8 slots is notified from the base station device 3 to the terminal device 1 by RRC signaling. For example, the period and the offset are notified from the base station device 3 to the terminal device 1. As the period, for example, 8 is notified. As the offset, any one of 0, 1, 2, 3, 4, 5, 6, 7 is notified. Here, the offset indicates by how many slots the periodic resource allocation is performed with respect to the slot of a certain reference timing. Here, the period may be equal to the total number of HARQ processes used in the downlink cell. For example, when the total number of HARQ processes used in the downlink cell is 8, the period of the frequency resource used for transmission and reception of the HARQ-ACK codebook of the second method may be 8. For example, when the total number of HARQ processes used in the downlink cell is 16, the period of the frequency resource used for transmission and reception of the HARQ-ACK codebook of the second method may be 16. Here, the candidate for the offset may be equal to the value of the period. Here, the period may be equal to the total number of HARQ processes used in a plurality of downlink cells.

[0229] For example, the terminal device 1 transmits the HARQ-ACK codebook of the second method in a cycle of 0 to 8 slots. For example, the base station device 3A receives the HARQ-ACK codebook of the second method in a cycle of 0 to 8 slots. The terminal device 1 transmits the HARQ-ACK codebook composed of 8 HARQ-ACKs for 8 HARQ processes at slot 0. The base station device 3A receives the HARQ-ACK codebook composed of 8 HARQ-ACKs for 8 HARQ processes at slot 0. Next, the terminal device 1 transmits the HARQ-ACK codebook composed of 8 HARQ-ACKs for 8 HARQ processes at slot 8. The base station device 3A receives the HARQ-ACK codebook composed of 8 HARQ-ACKs for 8 HARQ processes at slot 8. Next, the terminal device 1 transmits the HARQ-ACK codebook composed of 8 HARQ-ACKs for 8 HARQ processes at slot 16. The base station device 3A receives the HARQ-ACK codebook composed of 8 HARQ-ACKs for 8 HARQ processes at slot 16. The terminal device 1 transmits, in the uplink cell of the base station device 3A, the HARQ-ACK codebook including the HARQ-ACK for the PDSCH of the downlink cell of the base station device 3B. The base station device 3A receives, in the uplink cell managed by the base station device 3A, the HARQ-ACK codebook including the HARQ-ACK for the PDSCH received by the terminal device 1 in the downlink cell of the base station device 3B, and notifies (forwards) the received HARQ-ACK to the base station device 3B.

[0230] For each transmission of the HARQ-ACK codebook, the terminal device 1 resets (flashes) the HARQ-ACK held (stored) for each HARQ process. The reset (flashed) HARQ-ACK has NACK set as the default value. When the HARQ-ACK for the HARQ process used for the transmission of the PDSCH is ACK, the base station device 3B recognizes that the PDSCH has been properly received without data errors in the terminal device 1 and does not perform retransmission of the data. When the HARQ-ACK for the HARQ process used for the transmission of the PDSCH is NACK, the base station device 3B recognizes that the PDSCH has not been properly received without data errors in the terminal device 1 and performs retransmission of the data. The base station device 3B ignores the HARQ-ACK for the HARQ process not used for the transmission of the PDSCH.

[0231] When a Dynamic HARQ-ACK codebook (Type 2 HARQ-ACK codebook) is used as the HARQ-ACK codebook of the first method, the UL grant includes a UL DAI field. The UL grant may include a UL DAI field for each PDSCH group. The number of PDSCH groups to be used may be configured from the base station device 3 to the terminal device 1 using RRC signaling. The base station device 3 transmits a UL grant including a UL DAI field for each PDSCH group to the terminal device 1 and receives a PUSCH including HARQ-ACK information for each PDSCH group. The terminal device 1 receives a UL grant including a UL DAI field for each PDSCH group from the base station device 3 and transmits a PUSCH including HARQ-ACK information for each PDSCH group. The terminal device 1 receives a UL grant including a UL DAI field for each PDSCH group from the base station device 3 and transmits a PUSCH including HARQ-ACK information for all pre-configured PDSCH groups.

[0232] For example, when there are two PDSCH groups, namely PDSCH group 1 and PDSCH group 2, the UL DAI field for PDSCH group 1 and the UL DAI field for PDSCH group 2 are included in the UL grant. The terminal device 1 determines the HARQ-ACK information for PDSCH group 1 using the UL DAI field for PDSCH group 1, and determines the HARQ-ACK information for PDSCH group 2 using the UL DAI field for PDSCH group 2. The UL DAI field indicates the number of PDSCHs including the HARQ-ACK corresponding to the HARQ-ACK codebook transmitted on the PUSCH. When the number of received PDSCHs by the terminal device 1 is less than the number of PDSCHs indicated by the UL DAI field, the terminal device 1 determines that there is a missed detected PDCCH, and sets the bit indicating NACK in the corresponding HARQ-ACK bit. The terminal device 1 transmits the HARQ-ACK information for PDSCH group 1 and the HARQ-ACK information for PDSCH group 2 on the PUSCH. The base station device 3 determines whether a missed detection of the PDCCH in PDSCH group 1 has occurred in the terminal device 1 from the HARQ-ACK information for PDSCH group 1 received on the PUSCH, and determines whether a missed detection of the PDCCH in PDSCH group 2 has occurred in the terminal device 1 from the HARQ-ACK information for PDSCH group 2 received on the PUSCH. In this way, by including the UL DAI field for each PDSCH group in the UL grant, the terminal device 1 can determine the missed detection of the PDCCH for each PDSCH group, and the base station device 3 can appropriately recognize the determination result of the terminal device 1.

[0233] The UL grant may include one UL DAI field for all PDSCH groups. The base station device 3 transmits a UL grant including the UL DAI field for all PDSCH groups to the terminal device 1, and receives a PUSCH including the HARQ-ACK information of all PDSCH groups. The terminal device 1 receives a UL grant including the UL DAI field for all PDSCH groups from the base station device 3, and transmits a PUSCH including the HARQ-ACK information of all PDSCH groups. The UL DAI field for all PDSCH groups may indicate the size of the HARQ-ACK codebook including the HARQ-ACK information of all PDSCH groups. The UL DAI field for all PDSCH groups may indicate the number of HARQ-ACKs of all PDSCH groups included in the HARQ-ACK codebook transmitted on the PUSCH. The UL DAI field for all PDSCH groups may indicate the number of PDSCHs of all PDSCH groups for which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH.

[0234] For example, when there are two PDSCH groups, i.e., PDSCH group 1 and PDSCH group 2, the UL grant includes a UL DAI field for the combined PDSCH group of PDSCH group 1 and PDSCH group 2. The terminal device 1 determines the HARQ-ACK information for PDSCH group 1 and PDSCH group 2 using the UL DAI field. The UL DAI field indicates the number of PDSCHs of all PDSCH groups for which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted on the PUSCH. When the number of received PDSCHs is less than the number of PDSCHs indicated by the UL DAI field, the terminal device 1 determines that there is a missed detected PDCCH, and sets the bit indicating NACK in the corresponding HARQ-ACK bit. The terminal device 1 transmits the HARQ-ACK information for PDSCH group 1 and PDSCH group 2 on the PUSCH.

[0235] FIG. 10 is a diagram showing an example of a search area set in the terminal device 1 according to an aspect of the present embodiment. In FIG. 10, 14 OFDM symbols (l = 0, l = 1, l = 2, l = 3, l = 4, l = 5, l = 6, l = 7, l = 8, l = 9, l = 10, l = 11, l = 12, l = 13) are configured in one slot. In FIG. 10, the first to seventh OFDM symbols (l = 0 to l = 6) are the OFDM symbols in the first half of the slot, and the eighth to fourteenth OFDM symbols (l = 7 to l = 13) are the OFDM symbols in the first half of the slot. In FIG. 10, the first search area is set in the first (l = 0) OFDM symbol of the slot.

[0236] FIG. 11 is a diagram showing an example of a search area set in the terminal device 1 according to an aspect of the present embodiment. In FIG. 11, 14 OFDM symbols (l = 0, l = 1, l = 2, l = 3, l = 4, l = 5, l = 6, l = 7, l = 8, l = 9, l = 10, l = 11, l = 12, l = 13) are configured in one slot. In FIG. 11, the first to seventh OFDM symbols (l = 0 to l = 6) are the OFDM symbols in the first half of the slot, and the eighth to fourteenth OFDM symbols (l = 7 to l = 13) are the OFDM symbols in the first half of the slot. In FIG. 11, the second search area is set in the first (l = 0) OFDM symbol of the slot and the eighth (l = 7) OFDM symbol of the slot. In this case, one PDCCH candidate is composed of one or more CCEs in the first (l = 0) OFDM symbol of the slot or one or more CCEs in the eighth (l = 7) OFDM symbol of the slot. Note that the search area set in the first (l = 0) OFDM symbol of the slot and the search area set in the eighth (l = 7) OFDM symbol of the slot may be logically different search areas. FIG. 11 may be a search area set composed of the search area set in the first (l = 0) OFDM symbol of the slot and the search area set in the eighth (l = 7) OFDM symbol of the slot.

[0237] FIG. 12 is a diagram showing an example of a search area set in the terminal device 1 according to an aspect of the present embodiment. In FIG. 12, 14 OFDM symbols (l = 0, l = 1, l = 2, l = 3, l = 4, l = 5, l = 6, l = 7, l = 8, l = 9, l = 10, l = 11, l = 12, l = 13) are configured in one slot. In FIG. 12, the first (l = 0) to seventh (l = 6) OFDM symbols are the OFDM symbols in the first half of the slot, and the eighth (l = 7) to fourteenth (l = 13) OFDM symbols are the OFDM symbols in the first half of the slot. In FIG. 12, the third search area is set in the first (l = 0) to second (l = 1) OFDM symbols of the slot. In this case, one PDCCH candidate is composed of one or more CCEs of the first (l = 0) and second (l = 1) OFDM symbols of the slot.

[0238] FIG. 13 is a diagram showing an example of a search area set in the terminal device 1 according to an aspect of the present embodiment. In FIG. 13, 14 OFDM symbols (l = 0, l = 1, l = 2, l = 3, l = 4, l = 5, l = 6, l = 7, l = 8, l = 9, l = 10, l = 11, l = 12, l = 13) are configured in one slot. In FIG. 13, the first (l = 0) to seventh (l = 6) OFDM symbols are the OFDM symbols in the first half of the slot, and the eighth (l = 7) to fourteenth (l = 13) OFDM symbols are the OFDM symbols in the first half of the slot. In FIG. 13, the fourth search area is set in the first (l = 0) OFDM symbol of the slot, the fourth (l = 3) OFDM symbol of the slot, the eighth (l = 7) OFDM symbol of the slot, and the twelfth (l = 11) OFDM symbol of the slot. In this case, one PDCCH candidate is composed of one or more CCEs of the first (l = 0) OFDM symbol of the slot, or one or more CCEs of the fourth (l = 3) OFDM symbol of the slot, or one or more CCEs of the eighth (l = 7) OFDM symbol of the slot, or one or more CCEs of the twelfth (l = 11) OFDM symbol of the slot.

[0239] As described above, in one aspect of the present invention, HARQ-ACK can be appropriately exchanged between the terminal device 1 and the base station device 3. As a result, the base station device 3 can appropriately control the retransmission of data. By realizing appropriate retransmission control, efficient communication is achieved.

[0240] Hereinafter, aspects of various devices according to one aspect of the present embodiment will be described.

[0241] (1) To achieve the above object, an aspect of the present invention takes the following means. That is, the first aspect of the present invention is a terminal device including a processor and a memory storing computer program code, wherein a periodic resource is set in an uplink cell managed by a first base station device, and a HARQ-ACK codebook including HARQ-ACK for PDSCH of a downlink cell managed by a second base station device is transmitted using the periodic resource.

[0242] (2) Further, the HARQ-ACK codebook is composed of a plurality of HARQ-ACKs, and each of the HARQ-ACKs corresponds to a different HARQ process.

[0243] (3) Further, when the HARQ-ACK codebook is transmitted, the HARQ-ACK for each stored HARQ process is reset.

[0244] (4) Further, the uplink cell managed by the second base station device is not configured for the terminal device.

[0245] (5) A second aspect of the present invention is a base station device including a processor and a memory storing computer program code, and the base station device performs operations including: setting periodic resources in an uplink cell for a terminal device; receiving, from the terminal device, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a different base station device, using the periodic resources; and transferring the received HARQ-ACK to the different base station device.

[0246] (6) Further, the HARQ-ACK codebook is composed of a plurality of HARQ-ACKs, and each of the HARQ-ACKs corresponds to a different HARQ process.

[0247] (7) A third aspect of the present invention is a communication method used for a terminal device, including steps of: setting periodic resources in an uplink cell managed by a first base station device; and transmitting, using the periodic resources, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a second base station device.

[0248] (8) Further, the HARQ-ACK codebook is composed of a plurality of HARQ-ACKs, and each of the HARQ-ACKs corresponds to a different HARQ process.

[0249] (9) Further, when the HARQ-ACK codebook is transmitted, the method includes a step of resetting the HARQ-ACK for each stored HARQ process.

[0250] (10) Further, the uplink cell managed by the second base station device is not configured for the terminal device.

[0251] (11) A fourth aspect of the present invention is a communication method used in a base station apparatus, including steps of setting periodic resources in an uplink cell for a terminal apparatus, receiving from the terminal apparatus, in the periodic resources, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a different base station apparatus, and forwarding the received HARQ-ACK to the different base station apparatus.

[0252] (12) Further, the HARQ-ACK codebook is composed of a plurality of HARQ-ACKs, and each of the HARQ-ACKs corresponds to a different HARQ process.

[0253] A program operating in the base station apparatus 3 and the terminal apparatus 1 according to an aspect of the present invention may be a program (a program for functioning a computer) that controls a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiment according to an aspect of the present invention. Information handled by these apparatuses is temporarily stored in a RAM (Random Access Memory) during its processing, and then stored in various ROMs such as a Flash ROM (Read Only Memory) or an HDD (Hard Disk Drive), and read out by the CPU as needed for correction and writing.

[0254] Note that a part of the terminal apparatus 1 and the base station apparatus 3 in the above-described embodiment may be realized by a computer. In that case, a program for realizing this control function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed to be realized.

[0255] Here, the "computer system" referred to herein is a computer system built into the terminal device 1 or the base station device 3, and includes hardware such as an OS and peripheral devices. The "computer-readable recording medium" refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built into a computer system.

[0256] Furthermore, the "computer-readable recording medium" also includes those that hold a program dynamically for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, and those that hold a program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or a client in that case. Also, the above program may be for realizing a part of the functions described above, and may further be realizable in combination with a program already recorded in the computer system for realizing the functions described above.

[0257] The terminal device 1 may be composed of at least one processor and at least one memory including computer program instructions (computer program). The memory and the computer program instructions (computer program) may be configured to cause the terminal device 1 to perform the operations and processes described in the above embodiments using the processor. The base station device 3 may be composed of at least one processor and at least one memory including computer program instructions (computer program). The memory and the computer program instructions (computer program) may be configured to cause the base station device 3 to perform the operations and processes described in the above embodiments using the processor.

[0258] In addition, the base station apparatus 3 in the above-described embodiment can also be realized as an aggregate (apparatus group) composed of a plurality of apparatuses. Each of the apparatuses constituting the apparatus group may include some or all of the functions or function blocks of the base station apparatus 3 related to the above-described embodiment. As long as the apparatus group has all the functions or function blocks of the base station apparatus 3, it is sufficient. Further, the terminal apparatus 1 related to the above-described embodiment can also communicate with the base station apparatus as an aggregate.

[0259] In addition, the base station apparatus 3 in the above-described embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). Further, the base station apparatus 3 in the above-described embodiment may have some or all of the functions of a higher-level node with respect to an eNodeB and / or a gNB.

[0260] In addition, the terminal apparatus 1, a part, or all of the base station apparatus 3 in the above-described embodiment may typically be realized as an LSI which is an integrated circuit, or may be realized as a chipset. Each function block of the terminal apparatus 1 and the base station apparatus 3 may be individually chipized, or some, or all of them may be integrated and chipized. Further, the method of integrating into an integrated circuit is not limited to an LSI, and may be realized by a dedicated circuit or a general-purpose processor. Also, when an integrated circuit technology that replaces an LSI appears due to the progress of semiconductor technology, it is also possible to use an integrated circuit based on such technology.

[0261] In the above-described embodiment, a terminal apparatus is described as an example of a communication apparatus. However, the invention of the present application is not limited thereto, and it can also be applied to stationary or non-mobile electronic devices installed indoors and outdoors, such as AV devices, kitchen devices, cleaning and washing devices, air conditioning devices, office devices, vending machines, and other terminal devices or communication devices of living devices.

[0262] As described above in detail with reference to the drawings regarding the embodiments of the present invention, the specific configuration is not limited to this embodiment, and also includes design changes and the like within the scope not departing from the gist of the present invention. Further, one aspect of the present invention can be variously modified within the scope shown in the claims, and embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Also included is a configuration in which elements described in each of the above embodiments and elements having the same effects are replaced with each other.

Industrial Applicability

[0263] One aspect of the present invention can be used, for example, in a communication system, communication equipment (e.g., a mobile phone device, a base station device, a wireless LAN device, or a sensor device), an integrated circuit (e.g., a communication chip), or a program.

Explanation of Reference Numerals

[0264] 1 (1A, 1B, 1C) Terminal device 3 Base station device 10, 30 Radio transceiver unit 11, 31 Antenna unit 12, 32 RF unit 13, 33 Baseband unit 14, 34 Upper layer processing unit 15, 35 Medium access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims

1. A terminal device comprising a processor and a memory storing computer program code, the terminal device performing operations including: setting periodic resources in an uplink cell managed by a first base station device; transmitting, on the periodic resources, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a second base station device; transmitting, on resources dynamically notified by DCI format, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by the first base station device. A terminal device that executes operations including the above.

2. The HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by the second base station device is configured with HARQ-ACK for the PDSCH of HARQ processes having a plurality of predetermined HARQ process numbers. The HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by the first base station device is configured with HARQ-ACK for the PDSCH associated with the value of each DAI field. The terminal device according to Claim 1.

3. When the HARQ-ACK codebook is transmitted, resetting the HARQ-ACK for each stored HARQ process. The terminal device according to Claim 2.

4. The uplink cell managed by the second base station device is not configured for the terminal device. The terminal device according to Claim 1.

5. A base station device comprising a processor and a memory storing computer program code, the base station device performing operations including: setting periodic resources in an uplink cell for a terminal device; receiving, from the terminal device on the periodic resources, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a different base station device; receiving, from the terminal device on resources dynamically notified by DCI format, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by the base station device itself. Transferring the HARQ-ACK for the PDSCH of the downlink cell managed by the received different base station apparatuses to the different base station apparatuses; A base station apparatus that executes an operation including this.

6. The HARQ-ACK codebook including the HARQ-ACK for the PDSCH of the downlink cell managed by the different base station apparatuses is configured with the HARQ-ACK for the PDSCH of the HARQ processes of a plurality of predetermined HARQ process numbers. The HARQ-ACK codebook including the HARQ-ACK for the PDSCH of the downlink cell managed by the own base station apparatus is configured with the HARQ-ACK for the PDSCH associated with the value of each DAI field. The base station apparatus according to claim 5.

7. A communication method used for a terminal device, comprising: Setting periodic resources in an uplink cell managed by a first base station apparatus; Transmitting a HARQ-ACK codebook including the HARQ-ACK for the PDSCH of a downlink cell managed by a second base station apparatus on the periodic resources; Transmitting a HARQ-ACK codebook including the HARQ-ACK for the PDSCH of a downlink cell managed by the first base station apparatus on a resource dynamically notified by DCI format; A communication method including this.

8. The HARQ-ACK codebook including the HARQ-ACK for the PDSCH of the downlink cell managed by the second base station apparatus is configured with the HARQ-ACK for the PDSCH of the HARQ processes of a plurality of predetermined HARQ process numbers. The HARQ-ACK codebook including the HARQ-ACK for the PDSCH of the downlink cell managed by the first base station apparatus is configured with the HARQ-ACK for the PDSCH associated with the value of each DAI field. The communication method according to claim 7.

9. When the HARQ-ACK codebook is transmitted, resetting the HARQ-ACK for each stored HARQ process; The communication method according to claim 7, further including this.

10. The uplink cell managed by the second base station apparatus is not configured for the terminal device. The communication method according to claim 7.

11. A communication method used in a base station apparatus, comprising: setting periodic resources in an uplink cell for a terminal device; receiving, from the terminal device, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by a different base station apparatus, using the periodic resources; receiving, from the terminal device, a HARQ-ACK codebook including HARQ-ACK for a PDSCH of a downlink cell managed by the base station apparatus itself, using a resource dynamically notified by DCI format; transferring the received HARQ-ACK for the PDSCH of the downlink cell managed by the different base station apparatus to the different base station apparatus; and a communication method including the above steps.

12. The HARQ-ACK codebook including HARQ-ACK for the PDSCH of the downlink cell managed by the different base station apparatus is configured with HARQ-ACK for the PDSCH of HARQ processes having a plurality of predetermined HARQ process numbers. The HARQ-ACK codebook including HARQ-ACK for the PDSCH of the downlink cell managed by the base station apparatus itself is configured with HARQ-ACK for the PDSCH associated with the value of each DAI field. The communication method according to claim 11.

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