Terminal device, base station device, and communication method

Abstract

This terminal device, which comprises a processor and a memory that stores a computer program code, executes an operation including selecting a code series from among a plurality of code series candidates on the basis of a combination of HARQ-ACKs for a PDSCH corresponding to each C-DAI value and transmitting the selected code series.

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. 2020-150233, filed on September 8, 2020, and incorporates its content 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 Third Generation Partnership Project (3GPP: 3rd Generation Partnership Project). In LTE, the base station device is also called an eNodeB (evolved NodeB), and the 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 5G communication method, the study and standardization of the next-generation standard (NR: New Radio) are being carried out. NR is required to satisfy the requirements assumed for 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 for coverage improvement is being studied (Non-Patent Document 1). eMBB service and VoIP service are considered as target services. The uplink channels of PUSCH and PUCCH are considered as channels that require coverage improvement. As a method for PUCCH that transmits and receives more than 1 bit, sequence-based DMRS-less noncoherent PUCCH transmission is being studied (Non-Patent Document 2).

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Non-Patent Document 2

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 data reception result (the received data was not incorrect, the received data was incorrect, the data was not received), etc. from the data receiving side to the data transmitting side. The data transmitting side retransmits the data that was not appropriately received at the receiving side based on the information fed back from the data receiving side. For example, the data transmitting side is a base station device, the data receiving side is a terminal device, the data is a transport block (the 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. For this purpose as well, it is necessary to enable the transmission and reception of a plurality of HARQ-ACKs using sequence-based DMRS-less noncoherent PUCCH transmission. One aspect of the present invention provides a terminal device, a base station device, a communication method used for the terminal device, and a communication method used for the base station device that communicate efficiently.

Means for Solving the Problem

[0007] (1) To achieve the above object, one 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, and executes an operation including selecting and transmitting a code sequence from among a plurality of code sequence candidates based on a combination of HARQ-ACK for PDSCH corresponding to each C-DAI value.

[0008] (2) Further, it executes an operation including receiving RRC signaling indicating the maximum value of the C-DAI and setting the plurality of code sequence candidates based on the maximum value of the C-DAI.

[0009] (3) 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: transmitting RRC signaling indicating the maximum value of C-DAI to a terminal device; setting candidates for a plurality of code sequences based on the maximum value of the C-DAI; detecting a code sequence from among the candidates for the plurality of code sequences from a received signal from the terminal device; and determining a HARQ-ACK for a PDSCH corresponding to each C-DAI value from the detected code sequence.

[0010] (4) A third aspect of the present invention is a communication method used in a terminal device, including a step of selecting and transmitting a code sequence from among candidates for a plurality of code sequences based on a combination of HARQ-ACKs for PDSCHs corresponding to respective C-DAI values.

[0011] (5) Further, it includes a step of receiving RRC signaling indicating the maximum value of the C-DAI, and a step of setting candidates for the plurality of code sequences based on the maximum value of the C-DAI.

[0012] (6) A fourth aspect of the present invention is a communication method used in a base station device, including a step of transmitting RRC signaling indicating the maximum value of C-DAI to a terminal device; a step of setting candidates for a plurality of code sequences based on the maximum value of the C-DAI; a step of detecting a code sequence from among the candidates for the plurality of code sequences from a received signal from the terminal device; and a step of determining a HARQ-ACK for a PDSCH corresponding to each C-DAI value from the detected code sequence.

Advantages of the Invention

[0013] 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

[0014]

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Embodiments for Carrying Out the Invention

[0015] Hereinafter, embodiments of the present invention will be described.

[0016] "A and / or B" may be a term including "A", "B", or "A and B".

[0017] For a parameter or information to indicate one or more values, it 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.

[0018] FIG. 1 is a conceptual diagram of a wireless communication system according to an 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).

[0019] 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 SCell (Secondary Cell). The SCG may be configured to include one or more SCell. 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.

[0020] The frame structure will be described below.

[0021] In a wireless communication system according to an aspect of the present embodiment, OFDM (Orthogonal Frequency Division Multiplex) is at least used. 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.

[0022] The subcarrier spacing (SCS) may be given by subcarrier spacing Δf = 2 μ ·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.

[0023] In a wireless communication system according to an aspect of the present embodiment, a time unit (time unit) T is used for expressing the length in the time domain. c The time unit T c is c T max = 1 / (Δf f ·N max ) and may be given. Δf max may be the maximum value of the subcarrier spacing supported in a wireless communication system according to an aspect of the present embodiment. Δf max may be Δf f = 480 kHz. N f may be N max = 4096. The constant κ is κ = Δf f ·N ref / (Δf f,ref N ref ) = 64. Δff,ref It may be 2048.

[0024] 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 at least on 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.

[0025] Transmission in the downlink and / or transmission in the uplink are 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.

[0026] 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 within the subframe in the range from 0 to N subframe,μ slot −1. 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 within the frame in the range from 0 to N frame,μ slot −1. N consecutive slot symb OFDM symbols may be included in one slot. N slot symbmay be provided based at least in part on a slot configuration and / or a part or all of a CP (Cyclic Prefix) configuration. The slot configuration may be provided at least by a higher layer parameter tdd-UL-DL-ConfigurationCommon. The CP configuration may be provided based at least on a higher layer parameter. The CP configuration may be provided 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).

[0027] FIG. 2 shows an example of the relationship between N slot symb in accordance with one aspect of the present embodiment, the subcarrier spacing setting μ, the slot setting, and the 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 N slot symb at slot setting 1.

[0028] FIG. 3 is an example showing the configurations of a radio frame, a subframe, and a slot according to an 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 (e.g., transmission time interval (TTI)) defined in an upper layer (e.g., MAC: Media Access Control, RRC: Radio Resource Control).

[0029] 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 (e.g., 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Hereinafter, the physical resources will be described.

[0034] 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. When 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 some or all of delay spread, Doppler spread, Doppler shift, average gain, average delay, and some of the beam parameters (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, when 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. The fact that two antenna ports are QCL may mean that it is assumed that the two antenna ports are QCL.

[0035] For each of the subcarrier interval setting and the carrier set, N μ RB,x N RB sc number of subcarriers and N (μ) symb N subframe,μsymb A resource grid of one OFDM symbol is provided. N μ RB,x N may indicate the number of resource blocks provided for the subcarrier spacing setting μ for carrier x. μ RB,x N may be the maximum number of resource blocks provided for the subcarrier spacing setting μ for carrier x. Carrier x indicates either a downlink carrier or an uplink carrier. That is, x is "DL" or "UL". μ RB N μ RB,DL and / or μ RB,UL is a name including RB sc N may indicate the number of subcarriers included in one resource block. At least one resource grid may be provided for each antenna port p, and / or for each subcarrier spacing setting μ, and / or for each transmission direction setting. The transmission direction includes at least the downlink (DL: DownLink) and the uplink (UL: UpLink). Hereinafter, a set of parameters including at least a part or all of the antenna port p, the subcarrier spacing setting μ, and the 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.

[0036] In the downlink, the carrier included in the serving cell is called a downlink carrier (or a downlink component carrier). In the uplink, the carrier included in the serving cell is called an uplink carrier (an uplink component carrier). The downlink component carrier and the uplink component carrier are collectively called a component carrier (or a carrier).

[0037] Each element in the resource grid given for each first radio parameter set is referred to as a resource element. The resource element is indexed by the frequency domain index k sc and the time domain index l sym For a certain first radio parameter set, the resource element is indexed by the frequency domain index k sc and the time domain index l sym The resource element specified by the frequency domain index k sc and the time domain index l sym is also referred to as the resource element (k sc , l sym ). The frequency domain index k sc is 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 frequency domain index k sc may correspond to the subcarrier index k sc . The time domain index l sym may correspond to the OFDM symbol index l sym .

[0038] 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 time domain index l sym and the vertical axis is the frequency domain index k sc . In one subframe, the frequency domain of the resource grid is N μ RB N RB scincludes a number of sub - carriers. In one sub - frame, the time domain of the resource grid is 14·2 μ may include OFDM symbols. One resource block consists of N RB sc sub - carriers. 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 sub - frame.

[0039] 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 BWP (BWP: BandWidth Part). The BWP may be given based at least on upper - layer parameters and / or part or all of the DCI. The BWP is also called the band part (BP: Bandwidth Part). 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 called the downlink BWP. The BWP set for the uplink carrier is also called the uplink BWP.

[0040] [[ID=??]] 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. This one downlink BWP is also called the activated downlink BWP.

[0041] It should be noted that there seems to be a formatting or numbering issue with the "??" in the translation of line ID 12. The original text's numbering might be incorrect or there could be a misunderstanding in the input. The translation is done as accurately as possible based on the provided text.One or more uplink BWPs may be configured 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. This one uplink BWP is also referred to as the active uplink BWP.

[0042] A set of downlink BWPs may be configured for the serving cell. The set of downlink BWPs may include one or more downlink BWPs. A set of uplink BWPs may be configured for the serving cell. The set of uplink BWPs may include one or more uplink BWPs.

[0043] Higher layer parameters are parameters included in higher layer signals. The higher layer signals may be RRC (Radio Resource Control) signaling or MAC CE (Medium Access Control Control Element). Here, the higher layer signals may be signals of the RRC layer or signals of the MAC layer.

[0044] The higher layer signal may be common RRC signaling. The common RRC signaling may include at least 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) Including at least the radioResourceConfigCommon information element Feature C3) Mapped to the PBCH

[0045] 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.

[0046] 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 includes the radioResourceConfigDedicated information element

[0047] 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 settings of the BWP. The settings of the BWP may at least indicate the frequency resources of the BWP.

[0048] For example, the MIB, the first system information, and the second system information may be included in the common RRC signaling. Also, an upper layer message mapped to the DCCH logical channel and at least including radioResourceConfigCommon may be included in the common RRC signaling. Also, an upper layer message mapped to the DCCH logical channel and not including the radioResourceConfigCommon information element may be included in the dedicated RRC signaling. Also, an upper layer message mapped to the DCCH logical channel and at least including the radioResourceConfigDedicated information element may be included in the dedicated RRC signaling.

[0049] 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 resource. The first system information may at least include information related to the setting of the initial connection. The second system information may be system information other than the first system information.

[0050] The radioResourceConfigDedicated information element may at least include information related to the PRACH resource. The radioResourceConfigDedicated information element may at least include information related to the setting of the initial connection.

[0051] Hereinafter, physical channels and physical signals according to various aspects of the present embodiment will be described.

[0052] 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)

[0053] The PUCCH may be used to transmit uplink control information (UCI). The uplink control information may include channel state information (CSI), scheduling request (SR), and part or all of the hybrid automatic repeat request acknowledgement (HARQ-ACK) corresponding to a 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.

[0054] 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 acknowledgement (ACK) or a negative-acknowledgement (NACK) corresponding to one or more transport blocks. The HARQ-ACK may at least include a HARQ-ACK codebook that includes 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 that includes the one or more transport blocks. The HARQ-ACK bits may indicate an ACK or NACK corresponding to one code block group (CBG) included in a transport block.

[0055] A Scheduling Request (SR) may be used at least to request resources for a PUSCH for initial transmission. A scheduling request bit may be used to indicate either a positive SR or a negative SR. When the scheduling request bit indicates a positive SR, it is also referred to as "a positive SR is transmitted". A positive SR may indicate that the terminal device 1 requests resources for a PUSCH for initial transmission. A positive SR may indicate that a scheduling request is triggered by a higher layer. A positive SR may be transmitted when the higher layer instructs to transmit a scheduling request. When the scheduling request bit indicates a negative SR, it is also referred to as "a negative SR is transmitted". A negative SR may indicate that the terminal device 1 does not request resources for a PUSCH for initial transmission. A negative SR may indicate that a scheduling request is not triggered by a higher layer. A negative SR may be transmitted when the higher layer does not instruct to transmit a scheduling request.

[0056] 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).

[0057] The PUCCH may support one or more PUCCH formats (e.g., PUCCH format 0 to PUCCH format 4, PUCCH format 5). 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.

[0058] 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, 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.

[0059] The PRACH is at least used to transmit a random access preamble (random access message 1). The PRACH may be at least used to indicate part or all of an initial connection establishment procedure, a handover procedure, a connection re-establishment procedure, synchronization (timing adjustment) for PUSCH transmission, and a request for resources for PUSCH. The random access preamble may be used to notify a base station device 3 of an index (random access preamble index) given by a higher layer of the terminal device 1.

[0060] 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 a higher 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)

[0061] UL DMRS is related to the transmission of PUSCH and / or PUCCH. UL DMRS is multiplexed with PUSCH or PUCCH. The base station device 3 may use UL DMRS to perform propagation path correction of PUSCH or PUCCH. Hereinafter, simply transmitting PUSCH together with the UL DMRS related to the PUSCH is referred to as transmitting PUSCH. Hereinafter, simply transmitting PUCCH together with the UL DMRS related to the PUCCH is 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.

[0062] SRS may not be related to the transmission of PUSCH or PUCCH. The base station device 3 may use SRS for channel state measurement. 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.

[0063] UL PTRS may be a reference signal that is at least used for phase tracking. UL PTRS may be associated with a UL DMRS group that includes at least the antenna ports used for one or more UL DMRSs. The association between UL PTRS and the UL DMRS group may be that at least some or all of the antenna ports of UL PTRS and the antenna ports included in the UL DMRS group are at least 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. 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, UL PTRS may be mapped to the first layer. UL PTRS may not be mapped to the second layer. The index of the antenna port to which UL PTRS is mapped may be given based at least on downlink control information.

[0064] In addition, an uplink physical signal not described above may be used.

[0065] 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) ·PDSCH (Physical Downlink Shared Channel)

[0066] The PBCH is at least used to transmit the Master Information Block (MIB). 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 composed of 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.

[0067] The PDCCH is at least used for transmitting the Downlink Control Information (DCI). 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 the DCI format. The downlink control information may include at least one of a downlink grant (DL grant) or an uplink grant (UL grant). The DCI format used for scheduling the PDSCH is also referred to as the downlink DCI format. The DCI format used for scheduling the PUSCH is also referred to as the uplink DCI format. The downlink grant is also referred to as the downlink assignment (DL assignment) or the downlink allocation (DL allocation). The uplink DCI format includes at least one of DCI format 0_0 and DCI format 0_1.

[0068] DCI format 0_0 is configured to include at least a part or all of 1A to 1F. 1A) 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 (Modulation and Coding Scheme field) 1F) CSI request field

[0069] The Identifier for DCI formats field may be used at least to indicate which one or more DCI formats the DCI format including the Identifier for DCI formats 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.

[0070] The Frequency domain resource assignment field may be used at least to indicate the assignment of frequency resources for PUSCH scheduled by the DCI format including the Frequency domain resource assignment field. The Frequency domain resource assignment field is also referred to as the FDRA (Frequency Domain Resource Allocation) field.

[0071] The time domain resource allocation field may be used at least to indicate the allocation of time resources for a PUSCH scheduled by a DCI format including the time domain resource allocation field.

[0072] The frequency hopping flag field may be used at least to indicate whether frequency hopping is applied to a PUSCH scheduled by a DCI format including the frequency hopping flag field.

[0073] The MCS field may be used at least to indicate a modulation scheme for a PUSCH scheduled by a DCI format including the MCS field, and / or part or all of a target coding rate. The target coding rate may be a target coding rate for a 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.

[0074] 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.

[0075] DCI format 0_1 is configured to include at least 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 2G) BWP field 2H) UL DAI field (downlink assignment index)

[0076] 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.

[0077] 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.

[0078] 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 one PDSCH reception is missed.

[0079] The BWP field may be used to indicate the uplink BWP to which the PUSCH scheduled by DCI format 0_1 is mapped.

[0080] 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.

[0081] The downlink DCI format includes at least one or both of DCI format 1_0 and DCI format 1_1.

[0082] 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

[0083] 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 contains 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 contains at least the HARQ-ACK corresponding to the transport block included in the PDSCH may be n + K1.

[0084] 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.

[0085] The PUCCH resource indication field may be a field indicating the index of one or more PUCCH resources included in a PUCCH resource set.

[0086] 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

[0087] The BWP field may be used to indicate the downlink BWP to which the PDSCH scheduled by DCI format 1_1 is mapped.

[0088] DCI format 2_0 may be composed of at least one or more slot format indicators (SFI: Slot Format Indicator).

[0089] 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 the transmission of PUSCH 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 the transmission of PUSCH 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 the reception of PDSCH is scheduled by a DL assignment in the flexible subframe (slot), the terminal device 1 processes the flexible subframe (slot) as a downlink subframe (slot).

[0090] 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).

[0091] In various aspects of this embodiment, unless otherwise specified, the number of resource blocks indicates the number of resource blocks in the frequency domain.

[0092] The downlink grant is used at least for scheduling one PDSCH within one serving cell. The downlink grant is used at least for scheduling a PDSCH within the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling a PDSCH within a slot different from the slot in which the downlink grant is transmitted. The uplink grant is used at least for scheduling one PUSCH within one serving cell.

[0093] The downlink DCI format includes a field (C-DAI: Counter Downlink Assignment Index field) indicating the cumulative number of transmitted PDCCHs. The C-DAI may indicate the cumulative number of transmitted PDSCHs. For example, when including the transmitted PDSCH and the cumulative number of transmitted PDSCHs up to that point is 1, "1" is indicated as the value of the C-DAI. For example, when including the transmitted PDSCH and the cumulative number of transmitted PDSCHs up to that point is 8, "8" is indicated as the value of the C-DAI.

[0094] Note that each type of DCI format may further include fields different from the above-described fields. For example, it may include a field (NFI: New Feedback Indicator field) indicating whether the HARQ-ACK information of 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 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 transmission of HARQ-ACK information is instructed. It may include a field (T-DAI: Total Downlink Assignment Index field) indicating the total number of PDCCHs to be transmitted.

[0095] 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 (PGI field) indicating the PGI 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.

[0096] The Requested PDSCH Group (RPG) may be a PDSCH group corresponding to 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 corresponding to each PDSCH group in the form of a bitmap, 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.

[0097] 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, 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).

[0098] The value of non-numerical K1 may be included in a 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 a timing indication field from a PDSCH included in a DCI format to HARQ feedback among a 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 HARQ feedback is 3, the code point "000" of the timing indication field from the PDSCH to 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 HARQ feedback is 3, the code point "000" of the timing indication field from the PDSCH to 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.

[0099] One physical channel may be mapped to one serving cell. One physical channel may be mapped to one BWP configured on one carrier included in one serving cell.

[0100] The terminal device 1 may have one or more control resource sets (CORESETs) 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.

[0101] 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).

[0102] 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.

[0103] 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). The group of resource blocks may be given by 6 consecutive resource blocks.

[0104] The number of OFDM symbols constituting the control resource set may be given based at least on a higher layer parameter. 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 higher 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 higher layer signaling.

[0105] 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 a part or all of the cell ID. For example, the time resource and / or the frequency resource of the control resource set for which it is set to monitor the PDCCH used for scheduling the first system information may be given based at least on the MIB.

[0106] The control resource set set in the MIB is also called CORESET#0. CORESET#0 may be a control resource set with index #0.

[0107] 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 exclusively used for the terminal device 1. The dedicated control resource set may be provided based at least on dedicated RRC signaling and part or all of the value of the 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 within the control resource set, and an index (CCE index) may be assigned to each CCE.

[0108] A CCE may be configured to include one or more groups of REGs. A 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 the REG 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. The terminal device 1 can perform channel estimation assuming that the precoders applied to the REs within the group of REGs are the same. 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 paraphrased as "between two different groups of REGs". The terminal device 1 can perform channel estimation assuming that the precoders applied to the REs between the groups of REGs are not the same.

[0109] 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.

[0110] 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.

[0111] The number of CCEs that make up a PDCCH candidate is also referred to as the aggregation level (AL: Aggregation Level). When one PDCCH candidate is composed of an 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. 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 In addition, 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. X

[0112] ​The terminal device 1 may monitor at least one or a plurality of search spaces in slots 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 slots 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.

[0113] 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.

[0114] 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. For each of the search space sets, an index of the control resource set associated with the search space set may be given.

[0115] The search space may have two types: CSS (Common Search Space) and USS (UE-specific Search Space). CSS may be a search space commonly set for a plurality of terminal devices 1. USS may be a search space including 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.

[0116] For type 0 PDCCH CSS for a DCI format scrambled by an SI-RNTI used to transmit system information in a primary cell, and type 1 PDCCH CSS for a DCI format scrambled by an RA-RNTI or TC-RNTI used for initial access, CSS may be used. For type of PDCCH CSS for a DCI format scrambled by a 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 a predetermined RNTI added thereto.

[0117] Information related to reception of the PDCCH may include information related to an ID indicating the destination of the PDCCH. The ID indicating the destination of the PDCCH may be an ID used for scrambling of 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). Information related to reception of the PDCCH may include information related to an ID used for scrambling of CRC bits added to the PDCCH. The terminal device 1 can attempt to receive the PDCCH based at least on information related to the ID included in the PBCH.

[0118] 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 used at least for scheduling the PDSCH transmitted including system information. The P-RNTI is used at least 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 used at least for scheduling user data for the RRC-connected terminal device 1. The Temporary C-RNTI is used at least for scheduling the random access message 4. The Temporary C-RNTI is used at least for scheduling the PDSCH including data mapped to the CCCH in the logical channel. The RA-RNTI is used at least for scheduling the random access message 2. The CC-RNTI is used at least for transmitting and receiving control information for unlicensed access. The INT-RNTI is used at least for indicating downlink pre-emption.

[0119] 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 schedules the PDSCH or PUSCH.

[0120] In addition, when carrier aggregation (CA: Carrier Aggregation) is set to perform communication (transmission and / or reception) by aggregating a plurality of serving cells and / or a plurality of component carriers for 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.

[0121] In addition, when performing communication 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.

[0122] 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.

[0123] 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 6 REGs. The REG may be composed of 1 OFDM symbol of 1 PRB (Physical Resource Block). That is, the REG may be composed of including 12 resource elements (RE: Resource Element). The PRB is also simply referred to as an RB (Resource Block).

[0124] 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.

[0125] 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 multiple 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.

[0126] 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.

[0127] In addition, when the start position (start symbol) of the OFDM symbol of the PDCCH is set for one control resource set, and when it is possible to detect PDCCHs within more than one control resource set during a predetermined period, for the time domain corresponding to each start symbol, the type of search area, 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 area, 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 a higher layer (RRC signaling), or may be predefined / set by a specification document. 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.

[0128] In addition, when there are more than one start positions (start symbols) of the OFDM symbol of the PDCCH 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 domain corresponding to each start symbol, the type of search area, 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 area, 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 a higher layer, or may be predefined / set by a specification document.

[0129] 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.

[0130] 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. When the terminal device 1 can set a control resource set greater than a predetermined number for one or more serving cells / component carriers, the terminal device 1 may transmit / notify the base station device 3 of the capability information related to blind detection.

[0131] When the terminal device 1 can set a control resource set greater than a predetermined number for a predetermined period of one or more serving cells / component carriers, the terminal device 1 may transmit / notify the base station device 3 of the capability information related to blind detection.

[0132] 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 the PDCCH candidates can be reduced. Also, 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.

[0133] When the terminal device 1 does not support the ability to detect (blind detect) a control resource set greater than a predetermined number in a predetermined period, the terminal device 1 may not transmit / notify the capability information related to the blind detection. When the base station device 3 does not receive the capability information related to the blind detection, the base station device 3 may perform settings related to the control resource set so as not to exceed a predetermined number for blind detection and transmit the PDCCH.

[0134] The settings related to the control resource set include a parameter indicating an index (ControlResourceSetId) for identifying the control resource set. Further, 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). Further, the settings related to the control resource set may include a parameter indicating the type of mapping from CCE to REG. Further, 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.

[0135] The settings related to the search area include a parameter indicating an index (search area index) for identifying the search area. The settings related to the search area include a parameter indicating an index of the control resource set in which the search area is located. The settings related to the search area may include parameters indicating the period and offset of the slot in which the search area is located. The settings related to the search area may include a parameter indicating the number of consecutive slots in which the search area is located. The settings related to the search area may include a parameter indicating the OFDM symbol in the slot in which monitoring of PDCCH candidates is performed. The settings related to the search area may include a parameter indicating the number of PDCCH candidates for which monitoring is performed for each CCE aggregation level. The settings related to the search area may include a parameter indicating the DCI format for which monitoring is performed. The settings related to the search area may include a parameter indicating the type of the search area (CSS or USS). RRC signaling may be used for transmitting and receiving a message indicating the settings related to the search area. SIB may be used for transmitting and receiving a message indicating the settings related to the search area. MIB may be used for transmitting and receiving a message indicating the settings related to the search area.

[0136] 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.

[0137] 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)

[0138] The synchronization signal is used for the terminal device 1 to achieve downlink frequency domain and / or time domain synchronization. The synchronization signal includes PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

[0139] The SS block (SS / PBCH block) is configured to include at least a part or all of PSS, SSS, and PBCH.

[0140] 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 DL DMRS that the base station device 3 is transmitting a signal.

[0141] 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.

[0142] 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.

[0143] 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.

[0144] Note that downlink physical signals not described above may be used.

[0145] 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.

[0146] 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. HARQ (Hybrid Automatic Repeat reQuest) control is performed for each transport block in the MAC layer. 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.

[0147] 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.

[0148] PUSCH and PDSCH may be used at least to transmit 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.

[0149] BCCH (Broadcast Control Channel), CCCH (Common Control Channel), and DCCH (Dedicated Control Channel) are logical channels. For example, BCCH is an upper layer channel used to transmit / receive the MIB. Also, CCCH (Common Control Channel) is an upper 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 an upper 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.

[0150] 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.

[0151] 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.

[0152] 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.

[0153] 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 have 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.

[0154] As shown in FIG. 6(c), a CCE (CCE #2) may be composed of REGs that are 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 that make up 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 that make up 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 that are mapped discontinuously with REGs in different time intervals (OFDM symbols) mixed. As shown in FIG. 6(e), a CCE (CCE #4) may be composed of REGs that are mapped dispersedly in units of groups of a plurality of REGs. As shown in FIG. 6(f), a CCE (CCE #5) may be composed of REGs that are mapped dispersedly in units of groups of a plurality of REGs.

[0155] FIG. 7 is a diagram showing an example of REGs that constitute a PDCCH candidate and the number of REGs that constitute a group of REGs according to one aspect of the present 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 an example shown in FIG. 7(a), one REG group is composed of two REGs. The number of REGs that constitute a REG group in the frequency domain may include a divisor of the number of PRBs mapped in the frequency direction. In an example shown in FIG. 7(a), the number of REGs that constitute a REG group in the frequency domain may be 1, 2, 3, or 6.

[0156] 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.

[0157] Hereinafter, a configuration example of the terminal device 1 according to one aspect of the present embodiment will be described.

[0158] 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 wireless transmission / reception unit 10 and an upper layer processing unit 14. The wireless transmission / reception unit 10 is configured to include at least 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 part or all of a medium access control layer processing unit 15 and a radio resource control layer processing unit 16. The wireless transmission / reception unit 10 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

[0159] 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 a control resource set. The reception processing unit of the terminal device 1 monitors PDCCH candidates within a control resource set.

[0160] 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 3. The receiving unit of the terminal device 1 receives the PDSCH. The receiving processing unit of the terminal device 1 performs the process of receiving the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3. The receiving processing unit of the terminal device 1 performs processes such as demodulation and decoding on the PDSCH. The receiving processing unit of the terminal device 1 generates a HARQ-ACK for the decoded PDSCH. The receiving processing unit of the terminal device 1 generates a HARQ-ACK for the PDSCH corresponding to a different value of C-DAI based on the received value of C-DAI. For example, when the receiving processing unit of the terminal device 1 receives a C-DAI with a value of '1' and then receives a C-DAI with a value of '3', it determines that the reception of the PDSCH corresponding to the C-DAI with an intermediate value of '2' has failed, and generates a NACK as the HARQ-ACK for the PDSCH corresponding to the C-DAI with a value of '2'. That is, when the values of the continuously received C-DAI become discontinuous, the receiving processing unit of the terminal device 1 determines that the reception (detection) of the PDCCH and PDSCH corresponding to the C-DAI with the intermediate value has failed. Also, the receiving processing unit of the terminal device 1 determines that it has not received the PDSCH corresponding to a C-DAI with a value larger than the value of the last received C-DAI. The receiving processing unit of the terminal device 1 sets a NACK as the HARQ-ACK for the PDSCH that has not actually been received (detected). It can also be said that a NACK is set for DTX. For example, when the receiving processing unit of the terminal device 1 receives a C-DAI with a value of '1' and then receives a C-DAI with a value of '3', it determines that it has not received (detected) the PDSCH corresponding to the C-DAI with a value of '2', and generates a NACK as the HARQ-ACK for the PDSCH corresponding to the C-DAI with a value of '2'.For example, when the maximum value of C-DAI is 8, if the received value of the last received C-DAI is "5", the receiving processing unit of the terminal device 1 determines that the PDSCHs corresponding to the C-DAIs of "6", "7", and "8" have not been received (detected), and sets (generates) NACK for each of the HARQ-ACK of the PDSCH corresponding to the C-DAI with a value of "6", the HARQ-ACK of the PDSCH corresponding to the C-DAI with a value of "7", and the HARQ-ACK of the PDSCH corresponding to the C-DAI with a value of "8".

[0161] The transmission unit (also referred to as the transmission processing unit) of the terminal device 1 transmits the HARQ-ACK. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK for the PDSCH. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK in the uplink frequency band (cell, component carrier, carrier) managed by the base station device 3. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3. The transmission processing unit of the terminal device 1 transmits the HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3 in the uplink frequency band (cell, component carrier, carrier) managed by the base station device 3. The transmission processing unit of the terminal device 1 selects a code sequence based on the combination of HARQ-ACKs corresponding to the PDSCHs for each value of the C-DAI generated by the receiving processing unit. The number of candidates for the code sequence is set by the radio resource control layer processing unit 16 in the transmission processing unit of the terminal device 1. The transmission processing unit of the terminal device 1 selects a code sequence from the set candidates for the code sequence based on the combination of HARQ-ACKs corresponding to the PDSCHs for each value of the C-DAI. The transmission processing unit of the terminal device 1 transmits the PUCCH (PUCCH format 5) using the selected code sequence.

[0162] The upper layer processing unit 14 outputs uplink data (transport block) generated by a user operation or the like to the radio transceiver unit 10. The upper layer processing unit 14 performs processing of the MAC layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and RRC layer.

[0163] The media access control layer processing unit 15 included in the upper layer processing unit 14 performs MAC layer processing.

[0164] 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 signal 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 the 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.

[0165] 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 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. The radio resource control layer processing unit 16 sets the maximum value of C-DAI based on the RRC signaling. For example, any one of 4, 6, and 8 may be set as the maximum value of C-DAI. Values different from 4, 6, and 8, such as 10, 12, etc., may be set as the maximum value of C-DAI. The radio resource control layer processing unit 16 sets the number corresponding to the C-DAI for which HARQ-ACK is generated to the reception processing unit. The radio resource control layer processing unit 16 sets the number of candidate code sequences to the transmission processing unit based on the maximum value of C-DAI. For example, when the maximum value of C-DAI is 4, the radio resource control layer processing unit 16 sets the transmission processing unit to use 16 candidate code sequences. For example, when the maximum value of C-DAI is 6, the radio resource control layer processing unit 16 sets the transmission processing unit to use 64 candidate code sequences. For example, when the maximum value of C-DAI is 8, the radio resource control layer processing unit 16 sets the transmission processing unit to use 256 candidate code sequences.

[0166] 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 (conversion to a time-continuous signal) for the data, and transmits it to the base station device 3.

[0167] 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.

[0168] 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: Fast Fourier Transform) on the signal after removing the CP, and extracts the signal in the frequency domain.

[0169] The baseband unit 13 performs an inverse fast Fourier transform (IFFT: Inverse Fast Fourier Transform) 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.

[0170] 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. The RF unit 12 may also have a function of controlling the transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0171] 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.

[0172] The receiving unit of the terminal device 1 monitors the number of PDCCH candidates 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 the 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 the PDCCH candidates in the search area of 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) in a certain slot. The receiving unit of the terminal device 1 monitors the PDCCH candidates in the search area of 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) in a certain slot, and monitors the 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 the PDCCH candidates in a distributed manner within the slot.

[0173] Hereinafter, a configuration example of the base station apparatus 3 according to one aspect of the present embodiment will be described.

[0174] FIG. 9 is a schematic block diagram showing the configuration of the base station apparatus 3 according to one aspect of the present embodiment. As shown in the figure, the base station apparatus 3 includes a radio transmission / reception unit 30 and an upper layer processing unit 34. The radio transmission / reception unit 30 includes an antenna unit 31, an RF unit 32, and a baseband unit 33. The upper layer processing unit 34 includes a media access control layer processing unit 35 and a radio resource control layer processing unit 36. The radio transmission / reception unit 30 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

[0175] The upper layer processing unit 34 performs processing of the MAC layer, PDCP layer, RLC layer, and RRC layer.

[0176] The media access control layer processing unit 35 included in the upper layer processing unit 34 performs processing of the MAC layer.

[0177] The radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs processing of the RRC layer. The radio resource control layer processing unit 36 generates downlink data (transport block), system information, RRC messages, MAC CE, etc. arranged in the PDSCH, or acquires them from an upper node, and outputs them to the radio transmission / reception unit 30. Further, the radio resource control layer processing unit 36 manages various setting information / parameters of each terminal device 1. The radio resource control layer processing unit 36 may set various setting information / parameters for each terminal device 1 via a signal of 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 processing or setting of a physical channel, 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.

[0178] 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.

[0179] The radio resource control layer processing unit 36 sets resources for transmitting HARQ-ACK for the terminal device 1. The radio resource control layer processing unit 36 of the base station device 3 sets resources for transmitting HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier). The radio resource control layer processing unit 36 of the base station device 3 sets the resources for transmitting HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) in the uplink frequency band (cell, component carrier, carrier). The radio resource control layer processing unit 36 sets the maximum value of C-DAI for the terminal device 1. The base station device 3 notifies the terminal device 1 of the maximum value of C-DAI using RRC signaling. The radio resource control layer processing unit 36 sets candidates for code sequences used for detection for the reception processing unit.

[0180] Since the function of the wireless transceiver unit 30 is the same as that of the wireless transceiver unit 10, the description will be appropriately omitted. 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 PDCCH candidates) configured in the search area of the control resource set of the terminal device 1.

[0181] 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.

[0182] 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 different OFDM symbols, and three or more search areas are configured.

[0183] 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 PDSCH. The reception processing unit of the base station apparatus 3 receives HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The reception processing unit of the base station apparatus 3 receives HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier). The reception processing unit of the base station apparatus 3 receives HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier) in the uplink frequency band (cell, component carrier, carrier). The reception processing unit of the base station apparatus 3 detects the PUCCH used for the transmission of HARQ-ACK using the candidate code sequences set in the radio resource control layer processing unit 36. The reception processing unit of the base station apparatus 3 extracts (generates, determines) HARQ-ACK for PDSCH for each value of C-DAI corresponding to the detected code sequence. The base station apparatus 3 controls the retransmission of PDSCH based on the extracted HARQ-ACK. For example, the reception processing unit of the base station apparatus 3 performs correlation detection between the signal generated from each code sequence and the received signal, and determines that the code sequence with the highest correlation value is transmitted from the terminal device 1.

[0184] 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.

[0185] 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 a hybrid automatic repeat request acknowledgement (HARQ-ACK) for downlink data (transport block, medium access control protocol data unit: MAC PDU, downlink-shared channel: DL-SCH, physical downlink shared channel: PDSCH).

[0186] 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.

[0187] If the downlink data is successfully decoded, an ACK for the downlink data is generated. If the downlink data is not 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.

[0188] The HARQ control for one transport block may be referred to as 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.

[0189] For each HARQ process, an NDI (New Data Indicator) is indicated in 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 non-updated value of NDI 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.

[0190] 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, it 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 (is the same), it determines that the received transport block is a retransmission. Here, toggling means switching to a different value.

[0191] The terminal device 1 may report HARQ-ACK information to the base station device 3 using a HARQ-ACK codebook in a 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.

[0192] 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.

[0193] 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.

[0194] 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 called L para and may also be referred to as such. 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 one of the values 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.

[0195] When the terminal device 1 is configured to monitor a PDCCH including DCI format 1_0 and is 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.

[0196] The counter DAI field indicates the cumulative number of PDSCHs or transport blocks scheduled up to the reception of the corresponding DCI format.

[0197] The counter DAI (Counter DAI) indicates, for a monitoring opportunity of a certain PDCCH in a certain serving cell among M monitoring opportunities of PDCCHs, the cumulative number of PDCCHs detected up to the monitoring opportunity of the PDCCH in the serving cell (or a value at least related to the cumulative number). The 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 the PDSCH.

[0198] A transmission method in the terminal device 1 for HARQ-ACK and a reception method in the base station device 3 for HARQ-ACK will be described. A plurality of candidate code sequences are used as the code sequences used for transmission of PUCCH (PUCCH format 5). For example, 4, or 8, or 16, or 32, or 64, or 128, or 256 candidate code sequences may be used. The terminal device 1 selects a code sequence from among the plurality of candidate code sequences based on the combination of HARQ-ACK for each value of C-DAI and transmits it. The base station device 3 recognizes (judges) the combination of HARQ-ACK of the PDSCH for each C-DAI transmitted to the terminal device 1 based on the received (detected) code sequence. The terminal device 1 selects a code sequence from among the plurality of candidate code sequences based on the combination of HARQ-ACK of the PDSCH corresponding to each value of C-DAI and transmits it. The base station device 3 recognizes (judges) the combination of HARQ-ACK of the PDSCH corresponding to each value of C-DAI transmitted to the terminal device 1 based on the received (detected) code sequence. When the terminal device 1 receives a PDSCH corresponding to a certain value of C-DAI, it sets ACK or NACK to HARQ-ACK based on the error detection result of the transport block of the PDSCH. When the terminal device 1 does not receive a PDSCH corresponding to a certain value of C-DAI, it sets NACK to the HARQ-ACK for that PDSCH.

[0199] The plurality of candidate code sequences may be divided into a plurality of groups and configured. Each group of the plurality of candidate code sequences may be configured for each combination in which the HARQ-ACK of the PDSCH corresponding to a certain value of C-DAI is ACK and the HARQ-ACK of the PDSCH corresponding to one or more C-DAIs having a value greater than that value is NACK (including DTX).

[0200] FIG. 10 is a diagram showing an example of combinations of HARQ-ACKs for each value of C-DAI and a plurality of candidate code sequences corresponding thereto. FIG. 11 is a diagram showing an example of combinations of HARQ-ACKs for each value of C-DAI and a plurality of candidate code sequences corresponding thereto. FIG. 12 is a diagram showing an example of combinations of HARQ-ACKs for each value of C-DAI and a plurality of candidate code sequences corresponding thereto. FIGS. 10 to 12 show cases where 256 candidate code sequences are used for combinations of HARQ-ACKs with C-DAI values from 1 to 8. In FIGS. 10 to 12, C-DAI with a value of 1 is denoted as C-DAI "1", C-DAI with a value of 2 is denoted as C-DAI "2", C-DAI with a value of 3 is denoted as C-DAI "3", C-DAI with a value of 4 is denoted as C-DAI "4", C-DAI with a value of 5 is denoted as C-DAI "5", C-DAI with a value of 6 is denoted as C-DAI "6", C-DAI with a value of 7 is denoted as C-DAI "7", and C-DAI with a value of 8 is denoted as C-DAI "8". In FIG. 10, group 1 is composed of one candidate code sequence, group 2 is composed of one candidate code sequence, group 3 is composed of two candidate code sequences, group 4 is composed of four candidate code sequences, group 5 is composed of eight candidate code sequences, group 6 is composed of sixteen candidate code sequences, and group 7 is composed of thirty-two candidate code sequences. In FIG. 11, group 8 is composed of sixty-four candidate code sequences. In FIG. 12, group 8 is composed of one hundred and twenty-eight candidate code sequences. Note that group 1 and group 2 may be configured as the same group. Note that in FIGS. 10 to 12, the group may be configured by being subdivided. Note that in FIGS. 10 to 12, the group may be configured by being integrated. Note that the identification code of the group may be different from the values described in FIGS. 10 to 12.

[0201] Group 1 corresponds to a code sequence for a combination in which the HARQ-ACKs of C-DAI “1”, C-DAI “2”, C-DAI “3”, C-DAI “4”, C-DAI “5”, C-DAI “6”, C-DAI “7”, and C-DAI “8” are all NACK. Group 2 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “1” is ACK and the HARQ-ACKs of C-DAI “2”, C-DAI “3”, C-DAI “4”, C-DAI “5”, C-DAI “6”, C-DAI “7”, and C-DAI “8” are all NACK. Group 3 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “2” is ACK, the HARQ-ACKs of C-DAI “3”, C-DAI “4”, C-DAI “5”, C-DAI “6”, C-DAI “7”, and C-DAI “8” are all NACK, and the HARQ-ACK of C-DAI “1” is either ACK or NACK. Group 4 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “3” is ACK, the HARQ-ACKs of C-DAI “4”, C-DAI “5”, C-DAI “6”, C-DAI “7”, and C-DAI “8” are all NACK, and the HARQ-ACKs of C-DAI “1” and C-DAI “2” are either ACK or NACK.For Group 5, the HARQ-ACK of C-DAI “4” is ACK, the HARQ-ACKs of C-DAI “5”, C-DAI “6”, C-DAI “7”, and C-DAI “8” are each NACK, and the code sequences correspond to the combinations of ACK and NACK for each of the HARQ-ACKs of C-DAI “1”, C-DAI “2”, and C-DAI “3”. For Group 6, the HARQ-ACK of C-DAI “5” is ACK, the HARQ-ACKs of C-DAI “6”, C-DAI “7”, and C-DAI “8” are each NACK, and the code sequences correspond to the combinations of ACK and NACK for each of the HARQ-ACKs of C-DAI “1”, C-DAI “2”, C-DAI “3”, and C-DAI “4”. For Group 7, the HARQ-ACK of C-DAI “6” is ACK, the HARQ-ACKs of C-DAI “7” and C-DAI “8” are each NACK, and the code sequences correspond to the combinations of ACK and NACK for each of the HARQ-ACKs of C-DAI “1”, C-DAI “2”, C-DAI “3”, C-DAI “4”, and C-DAI “5”. For Group 8, the HARQ-ACK of C-DAI “7” is ACK, the HARQ-ACK of C-DAI “8” is NACK, and the code sequences correspond to the combinations of ACK and NACK for each of the HARQ-ACKs of C-DAI “1”, C-DAI “2”, C-DAI “3”, C-DAI “4”, C-DAI “5”, and C-DAI “6”.Group 9 means that the HARQ-ACK of C-DAI “8” is ACK, and the code sequences correspond to the combinations of ACK and NACK for each of the HARQ-ACKs of C-DAI “1”, C-DAI “2”, C-DAI “3”, C-DAI “4”, C-DAI “5”, C-DAI “6”, and C-DAI “7”.

[0202] FIG. 13 is a diagram showing an example of combinations of HARQ-ACKs for each value of C-DAI and a plurality of candidate code sequences corresponding thereto. FIG. 13 shows a case where 16 candidate code sequences are used for the combinations of HARQ-ACKs when the value of C-DAI ranges from 1 to 4. In FIG. 13, C-DAI with a value of 1 is denoted as C-DAI “1”, C-DAI with a value of 2 is denoted as C-DAI “2”, C-DAI with a value of 3 is denoted as C-DAI “3”, and C-DAI with a value of 4 is denoted as C-DAI “4”. In FIG. 13, Group 11 is composed of one candidate code sequence, Group 12 is composed of one candidate code sequence, Group 13 is composed of two candidate code sequences, Group 14 is composed of four candidate code sequences, and Group 15 is composed of eight candidate code sequences.

[0203] Group 11 corresponds to a code sequence for a combination in which each of the HARQ-ACKs of C-DAI “1”, C-DAI “2”, C-DAI “3”, and C-DAI “4” is NACK. Group 12 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “1” is ACK and each of the HARQ-ACKs of C-DAI “2”, C-DAI “3”, and C-DAI “4” is NACK. Group 13 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “2” is ACK, each of the HARQ-ACKs of C-DAI “3” and C-DAI “4” is NACK, and the HARQ-ACK of C-DAI “1” is ACK or NACK. Group 14 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “3” is ACK, each of the HARQ-ACKs of C-DAI “4” is NACK, and each of the HARQ-ACKs of C-DAI “1” and C-DAI “2” is ACK or NACK. Group 15 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “4” is ACK and each of the HARQ-ACKs of C-DAI “1”, C-DAI “2”, and C-DAI “3” is ACK or NACK.

[0204] FIG. 14 is a diagram showing an example of combinations of HARQ-ACKs for each value of C-DAI and a plurality of candidate code sequences corresponding thereto. FIG. 14 shows a case where 64 candidate code sequences are used for combinations of HARQ-ACKs with C-DAI values from 1 to 6. In FIG. 14, the C-DAI with a value of 1 is denoted as C-DAI “1”, the C-DAI with a value of 2 is denoted as C-DAI “2”, the C-DAI with a value of 3 is denoted as C-DAI “3”, the C-DAI with a value of 4 is denoted as C-DAI “4”, the C-DAI with a value of 5 is denoted as C-DAI “5”, and the C-DAI with a value of 6 is denoted as C-DAI “6”. In FIG. 14, group 101 is composed of one candidate code sequence, group 102 is composed of one candidate code sequence, group 103 is composed of two candidate code sequences, group 104 is composed of four candidate code sequences, group 105 is composed of eight candidate code sequences, group 106 is composed of sixteen candidate code sequences, and group 107 is composed of thirty-two candidate code sequences.

[0205] Group 101 corresponds to a code sequence for a combination in which the HARQ-ACKs of C-DAI “1”, C-DAI “2”, C-DAI “3”, C-DAI “4”, C-DAI “5”, and C-DAI “6” are all NACK. Group 102 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “1” is ACK and the HARQ-ACKs of C-DAI “2”, C-DAI “3”, C-DAI “4”, C-DAI “5”, and C-DAI “6” are all NACK. Group 103 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “2” is ACK, the HARQ-ACKs of C-DAI “3”, C-DAI “4”, C-DAI “5”, and C-DAI “6” are all NACK, and the HARQ-ACK of C-DAI “1” is either ACK or NACK. Group 104 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “3” is ACK, the HARQ-ACKs of C-DAI “4”, C-DAI “5”, and C-DAI “6” are all NACK, and the HARQ-ACKs of C-DAI “1” and C-DAI “2” are either ACK or NACK. Group 105 corresponds to a code sequence for a combination in which the HARQ-ACK of C-DAI “4” is ACK, the HARQ-ACKs of C-DAI “5” and C-DAI “6” are all NACK, and the HARQ-ACKs of C-DAI “1”, C-DAI “2”, and C-DAI “3” are either ACK or NACK.Group 106 corresponds to a code sequence for each combination of ACK and NACK for the HARQ-ACK of C-DAI “5” being ACK, the HARQ-ACK of each of C-DAI “6” being NACK, and the HARQ-ACKs of C-DAI “1”, C-DAI “2”, C-DAI “3”, and C-DAI “4”. Group 107 corresponds to a code sequence for each combination of ACK and NACK for the HARQ-ACK of C-DAI “6” being ACK and the HARQ-ACKs of C-DAI “1”, C-DAI “2”, C-DAI “3”, C-DAI “4”, and C-DAI “5”.

[0206] By using a plurality of candidate code sequences corresponding to the combinations of HARQ-ACKs for each value of C-DAI as described above, the terminal device 1 can notify the base station device 3 of the HARQ-ACK for the PDSCH corresponding to each value of C-DAI, and the base station device 3 can detect the HARQ-ACK for the PDSCH corresponding to each value of C-DAI. The number of candidate code sequences used is set according to the maximum value of C-DAI, and the detection accuracy of the code sequence in the base station device 3 is improved.

[0207] The case where the maximum value of C-DAI is 8 will be described. When the value of C-DAI used by the base station apparatus 3 for the last transmission in a series of transmissions is "1", since the terminal apparatus 1 does not receive the PDSCH corresponding to the C-DAI values from "2" to "8", the terminal apparatus 1 indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "2" to "8". To select a code sequence from Group 1 or Group 2, the base station apparatus 3 can narrow down the candidates for the code sequence used for detection to Group 1 and Group 2. When the value of C-DAI used by the base station apparatus 3 for the last transmission in a series of transmissions is "2", since the terminal apparatus 1 does not receive the PDSCH corresponding to the C-DAI values from "3" to "8", the terminal apparatus 1 indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "3" to "8". To select a code sequence from Group 1 or Group 2 or Group 3, the base station apparatus 3 can narrow down the candidates for the code sequence used for detection to Group 1, Group 2, and Group 3. When the value of C-DAI used by the base station apparatus 3 for the last transmission in a series of transmissions is "3", since the terminal apparatus 1 does not receive the PDSCH corresponding to the C-DAI values from "4" to "8", the terminal apparatus 1 indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "4" to "8". To select a code sequence from Group 1 or Group 2 or Group 3 and Group 4, the base station apparatus 3 can narrow down the candidates for the code sequence used for detection to Group 1, Group 2, Group 3, and Group 4. When the value of C-DAI used by the base station apparatus 3 for the last transmission in a series of transmissions is "4", since the terminal apparatus 1 does not receive the PDSCH corresponding to the C-DAI values from "5" to "8", the terminal apparatus 1 indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "5" to "8". To select a code sequence from Group 1 or Group 2 or Group 3 and Group 4 and Group 5, the base station apparatus 3 can narrow down the candidates for the code sequence used for detection to Group 1, Group 2, Group 3, Group 4, and Group 5.When the value of C-DAI used by the base station device 3 for the last transmission in a series of transmissions is "5", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI values from "6" to "8", it indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "6" to "8". To select a code sequence from Group 1 or Group 2 or Group 3 and Group 4 and Group 5 and Group 6, the base station device 3 can narrow down the candidates for the code sequence used for detection to Group 1, Group 2, Group 3, Group 4, Group 5, and Group 6. When the value of C-DAI used by the base station device 3 for the last transmission in a series of transmissions is "6", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI values from "7" to "8", it indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "7" to "8". To select a code sequence from Group 1 or Group 2 or Group 3 and Group 4 and Group 5 and Group 6 and Group 7, the base station device 3 can narrow down the candidates for the code sequence used for detection to Group 1, Group 2, Group 3, Group 4, Group 5, Group 6, and Group 7. When the value of C-DAI used by the base station device 3 for the last transmission in a series of transmissions is "7", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI value of "8", it indicates NACK as the HARQ-ACK corresponding to the C-DAI value of "8". To select a code sequence from Group 1 or Group 2 or Group 3 and Group 4 and Group 5 and Group 6 and Group 7 and Group 8, the base station device 3 can narrow down the candidates for the code sequence used for detection to Group 1, Group 2, Group 3, Group 4, Group 5, Group 6, Group 7, and Group 8.

[0208] The case where the maximum value of C-DAI is 4 will be described. When the value of C-DAI used by the base station device 3 in the last transmission of a series of transmissions is "1", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI values from "2" to "4", it indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "2" to "4". To select a code sequence from group 11 or group 12, the base station device 3 can narrow down the candidates for the code sequence used for detection to group 11 and group 12. When the value of C-DAI used by the base station device 3 in the last transmission of a series of transmissions is "2", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI values from "3" to "4", it indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "3" to "4". To select a code sequence from group 11 or group 12 or group 13, the base station device 3 can narrow down the candidates for the code sequence used for detection to group 11, group 12, and group 13. When the value of C-DAI used by the base station device 3 in the last transmission of a series of transmissions is "3", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI value of "4", it indicates NACK as the HARQ-ACK corresponding to the C-DAI value of "4". To select a code sequence from group 11 or group 12 or group 13 and group 14, the base station device 3 can narrow down the candidates for the code sequence used for detection to group 11, group 12, group 13, and group 14.

[0209] The case where the maximum value of C-DAI is 6 will be described. When the value of C-DAI used by the base station device 3 in the last transmission of a series of transmissions is "1", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI values from "2" to "6", it indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "2" to "6". To select a code sequence from group 101 or group 102, the base station device 3 can narrow down the candidates for the code sequence used for detection to group 101 and group 102. When the value of C-DAI used by the base station device 3 in the last transmission of a series of transmissions is "2", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI values from "3" to "6", it indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "3" to "6". To select a code sequence from group 101 or group 102 or group 103, the base station device 3 can narrow down the candidates for the code sequence used for detection to group 101, group 102, and group 103. When the value of C-DAI used by the base station device 3 in the last transmission of a series of transmissions is "3", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI values from "4" to "6", it indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "4" to "6". To select a code sequence from group 101 or group 102 or group 103 and group 104, the base station device 3 can narrow down the candidates for the code sequence used for detection to group 101, group 102, group 103, and group 104. When the value of C-DAI used by the base station device 3 in the last transmission of a series of transmissions is "4", since the terminal device 1 does not receive the PDSCH corresponding to the C-DAI values from "5" to "6", it indicates NACK as the HARQ-ACK corresponding to the C-DAI values from "5" to "6". To select a code sequence from group 101 or group 102 or group 103 and group 104 and group 105, the base station device 3 can narrow down the candidates for the code sequence used for detection to group 101, group 102, group 103, group 104, and group 105.When the value of C-DAI used by the base station device 3 for the last transmission in a series of transmissions is "5", since the terminal device 1 does not receive the PDSCH corresponding to the value of C-DAI being "6", the terminal device 1 indicates NACK as the HARQ-ACK corresponding to the value of C-DAI being "6". To select a code sequence from group 101 or group 102 or group 103 and group 104 and group 105 and group 106, the base station device 3 can narrow down the candidates for the code sequence used for detection to group 101, group 102, group 103, group 104, group 105, and group 106.

[0210] As described above, one aspect of the present invention can appropriately exchange HARQ-ACK 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.

[0211] Hereinafter, aspects of various devices according to one aspect of the present embodiment will be described.

[0212] (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, and executes an operation including selecting and transmitting a code sequence from among a plurality of code sequence candidates based on a combination of HARQ-ACK for a PDSCH corresponding to each value of C-DAI.

[0213] (2) Further, it executes an operation including receiving RRC signaling indicating the maximum value of the C-DAI and setting the plurality of code sequence candidates based on the maximum value of the C-DAI.

[0214] (3) 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: transmitting RRC signaling indicating the maximum value of C-DAI to a terminal device; setting candidates for a plurality of code sequences based on the maximum value of the C-DAI; detecting a code sequence from among the candidates for the plurality of code sequences from a received signal from the terminal device; and determining HARQ-ACK for a PDSCH corresponding to each C-DAI value from the detected code sequence.

[0215] (4) A third aspect of the present invention is a communication method used in a terminal device, including the step of selecting and transmitting a code sequence from among candidates for a plurality of code sequences based on a combination of HARQ-ACK for a PDSCH corresponding to each C-DAI value.

[0216] (5) Further, the method includes the step of receiving RRC signaling indicating the maximum value of the C-DAI, and the step of setting candidates for the plurality of code sequences based on the maximum value of the C-DAI.

[0217] (6) A fourth aspect of the present invention is a communication method used in a base station device, including the steps of: transmitting RRC signaling indicating the maximum value of C-DAI to a terminal device; setting candidates for a plurality of code sequences based on the maximum value of the C-DAI; detecting a code sequence from among the candidates for the plurality of code sequences from a received signal from the terminal device; and determining HARQ-ACK for a PDSCH corresponding to each C-DAI value from the detected code sequence.

[0218] The base station apparatus 3 and the program operating on the terminal apparatus 1 according to one aspect of the present invention may be a program (a program that causes a computer to function) that controls a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiment according to one aspect of the present invention. And the 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) and an HDD (Hard Disk Drive), and read by the CPU as necessary for correction and writing.

[0219] In addition, 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 realize it.

[0220] Here, the "computer system" means a computer system built in the terminal apparatus 1 or the base station apparatus 3 and includes hardware such as an OS and peripheral devices. Further, the "computer-readable recording medium" means a flexible disk, a magneto-optical disk, a ROM, a portable medium such as a CD-ROM, and a storage device such as a hard disk built in a computer system.

[0221] Furthermore, the "computer-readable recording medium" may include something that holds 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 something that holds a program for a certain time, such as a volatile memory inside a computer system that becomes a server or a client in that case. Also, the above program may be for realizing a part of the above-described functions, and may further be realized in combination with a program already recorded in a computer system for realizing the above-described functions.

[0222] The terminal device 1 may include 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 processor to perform the operations and processes described in the above embodiments on the terminal device 1. The base station device 3 may include 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 processor to perform the operations and processes described in the above embodiments on the base station device 3.

[0223] Also, the base station device 3 in the above-described embodiment can also be realized as an aggregate (device group) composed of a plurality of devices. Each of the devices constituting the device group may include some or all of each function or each functional block of the base station device 3 related to the above-described embodiment. As long as the device group has all the functions or each functional block of the base station device 3, it is sufficient. Also, the terminal device 1 related to the above-described embodiment can also communicate with the base station device as an aggregate.

[0224] Also, the base station device 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). Also, the base station device 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.

[0225] Alternatively, part or all of the terminal device 1 and the base station device 3 in the above-described embodiments may typically be realized as an LSI, which is an integrated circuit, or may be realized as a chip set. Each functional block of the terminal device 1 and the base station device 3 may be individually chipified, or part or all of them may be integrated and chipified. Further, the method of integrating into an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Also, when a technology for integrating into an integrated circuit that replaces LSI appears due to the progress of semiconductor technology, it is also possible to use the integrated circuit based on such technology.

[0226] Further, in the above-described embodiments, a terminal device has been described as an example of a communication device. 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 terminal devices or communication devices of AV devices, kitchen devices, cleaning and washing devices, air conditioning devices, office devices, vending machines, and other household devices.

[0227] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present invention are also included. Also, 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. Further, a configuration in which elements described in the above embodiments and having the same effects are replaced with each other is also included.

Industrial Applicability

[0228] 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 Signs

[0229] 1(1A, 1B, 1C) Terminal device 3 Base station device 10 and 30 Wireless Transceiver Unit 11 and 31 Antenna Unit 12 and 32 RF Unit 13 and 33 Baseband Unit 14 and 34 Upper Layer Processing Unit 15 and 35 Medium Access Control Layer Processing Unit 16 and 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: selecting and transmitting a code sequence from among a plurality of code sequence candidates based on a combination of HARQ-ACK for PDSCH corresponding to each C-DAI value; receiving RRC signaling indicating the maximum value of the C-DAI; setting the plurality of code sequence candidates based on the maximum value of the C-DAI. A terminal device that executes operations including the above.

2. A base station device comprising a processor and a memory storing computer program code, the base station device performing: transmitting RRC signaling indicating the maximum value of the C-DAI to a terminal device; setting a plurality of code sequence candidates based on the maximum value of the C-DAI; detecting a code sequence from among the plurality of code sequence candidates from a received signal from the terminal device; determining HARQ-ACK for PDSCH corresponding to each C-DAI value from the detected code sequence. A base station device that executes operations including the above.

3. A communication method used in a terminal device, the method comprising: selecting and transmitting a code sequence from among a plurality of code sequence candidates based on a combination of HARQ-ACK for PDSCH corresponding to each C-DAI value; receiving RRC signaling indicating the maximum value of the C-DAI; setting the plurality of code sequence candidates based on the maximum value of the C-DAI. A communication method including the above steps.

4. A communication method used in a base station device, the method comprising: transmitting RRC signaling indicating the maximum value of the C-DAI to a terminal device; setting a plurality of code sequence candidates based on the maximum value of the C-DAI; detecting a code sequence from among the plurality of code sequence candidates from a received signal from the terminal device; determining HARQ-ACK for PDSCH corresponding to each C-DAI value from the detected code sequence. A communication method including the above steps.

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