Terminal device, base station device and communication method

Abstract

According to the present invention, an SCell monitors a downlink DCI format of a first type, including PDSCH scheduling information for an SCell, or a downlink DCI format of a second type, including both PDSCH scheduling information for a PCell and PDSCH scheduling information for the SCell, and the downlink DCI format of the first type, and if the downlink DCI format of the first type is detected, monitoring of the downlink DCI format of the second type begins.

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. 2020-57429, filed on March 27, 2020, the contents of which are incorporated herein by reference. [Background technology]

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

[0003] 3GPP is currently studying and standardizing the next-generation standard (NR: New Radio) as a 5G communication method. NR is expected to meet the requirements for three scenarios, eMBB (enhanced Mobile BroadBand), mMTC (massive Machine Type Communication), and URLLC (Ultra Reliable and Low Latency Communication), within a single technology framework.

[0004] Dynamic Spectrum Sharing, which operates both LTE and NR on the same frequency, is also under consideration (Non-Patent Document 1). Dynamic Spectrum Sharing is required for smooth migration from LTE to NR among cellular mobile communication operators. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "New WID on NR Dynamic spectrum sharing (DSS) ", RP-193260, Ericsson 3GPP TSG RAN Meeting #86, Sitges, Spain, December 9-12, 2019. Summary of the Invention [Problem to be solved by the invention]

[0006] It is required to realize sufficient scheduling capacity for NR terminal devices in a frequency shared by LTE and NR. One aspect of the present invention provides a terminal device and a base station device that perform efficient communication, a communication method used in the terminal device, and a communication method used in the base station device. [Means for solving the problem]

[0007] (1) In order to achieve the above object, one aspect of the present invention takes the following measures. That is, a first aspect of the present invention is a terminal device including a processor and a memory storing computer program code, which performs operations including: monitoring a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type downlink DCI format in an SCell; and starting monitoring the second type downlink DCI format when the first type downlink DCI format is detected.

[0008] (2) Furthermore, when the second type of downlink DCI format is not detected for a certain period of time while monitoring the second type of downlink DCI format, the monitoring of the second type of downlink DCI format is stopped.

[0009] (3) A second aspect of the present invention is a base station device comprising a processor and a memory for storing computer program code, the base station device performing operations including: transmitting a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type downlink DCI format in an SCell; and, when the first type downlink DCI format has been transmitted, starting to transmit the second type downlink DCI format.

[0010] (4) Furthermore, if the second type of downlink DCI format has not been transmitted for a certain period of time, transmission of the second type of downlink DCI format is stopped.

[0011] (5) A third aspect of the present invention is a communication method for use in a terminal device, comprising the steps of: monitoring a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type downlink DCI format in an SCell; and, when the first type downlink DCI format is detected, starting monitoring the second type downlink DCI format.

[0012] (6) Further, the method includes a step of stopping monitoring the second type downlink DCI format when the second type downlink DCI format is not detected for a certain period of time while monitoring the second type downlink DCI format.

[0013] (7) A fourth aspect of the present invention is a communication method for use in a base station device, comprising: transmitting, in an SCell, a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first downlink DCI format; and, when the first type downlink DCI format has been transmitted, starting to transmit the second type downlink DCI format.

[0014] (8) The method further includes a step of stopping transmission of the second type downlink DCI format when the second type downlink DCI format has not been transmitted for a certain period of time. Effect of the Invention

[0015] According to one aspect of the present invention, it is possible to realize efficient communication between a terminal device and a base station device while suppressing the processing load of the terminal device. [Brief description of the drawings]

[0016] [Figure 1] 1 is a conceptual diagram of a wireless communication system according to an embodiment of the present invention. [Diagram 2] 13 is an example showing a relationship between Nslot symb, a subcarrier interval setting μ, a slot setting, and a CP setting according to an aspect of the present embodiment. [Diagram 3] 1 is a diagram illustrating an example of a configuration of a radio frame, a subframe, and a slot according to an aspect of the present embodiment. [Figure 4] FIG. 2 is a schematic diagram illustrating an example of a resource grid in a subframe according to an aspect of the present embodiment. [Diagram 5] 1 is a schematic block diagram showing a configuration of a terminal device 1 according to an aspect of the present embodiment. [Figure 6] FIG. 2 is a schematic block diagram showing a configuration of a base station device 3 according to an aspect of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of the present invention will be described.

[0018] "A and / or B" may be a term that includes "A", "B", or "A and B".

[0019] A parameter or information indicating one or more values ​​may mean that the parameter or information at least includes a 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 multiple parameters.

[0020] Fig. 1 is a conceptual diagram of a wireless communication system according to one aspect of the present embodiment. In Fig. 1, the wireless communication system includes terminal devices 1A-1C and base station devices 3A-3B. Hereinafter, the terminal devices 1A-1C are also referred to as terminal devices 1 (UE). Hereinafter, the base station devices 3A-3B are also referred to as base station devices 3 (gNB or eNB).

[0021] 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 including at least a PCell (Primary Cell). The SCG is a group of serving cells including at least a PSCell (Primary Secondary Cell). The PCell may be a serving cell provided based on an initial connection. The MCG may be configured to include one or more SCells (Secondary Cells). The SCG may be configured to include one or more SCells. The serving cell identity is a short identifier for identifying a serving cell. The serving cell identity may be provided by a higher layer parameter.

[0022] For example, the base station device 3A communicates with the terminal device 1 using NR. For example, the base station device 3B communicates with the terminal device 1 using LTE. For example, the base station device 3A and the base station device 3B communicate with the terminal device 1 using the same frequency (carrier). For example, the base station device 3A and the base station device 3B communicate with the terminal device 1 using different frequencies (carriers). For example, the base station device 3A communicates with the terminal device 1 using the same frequency (carrier) as the base station device 3B and a different frequency (carrier). For example, at a certain frequency (carrier), the base station device 3A communicates using NR, and the base station device 3B communicates using LTE. That is, at a certain frequency (carrier), Dynamic Spectrum Sharing is used, and at a certain frequency (carrier), the base station device 3A communicates using NR, and the base station device 3B does not communicate. The base station device 3A communicates with the terminal device 1 by carrier aggregation using such multiple frequencies (carriers).

[0023] The frame structure will now be described.

[0024] In a wireless communication system according to an aspect of the present embodiment, at least OFDM (Orthogonal Frequency Division Multiplex) is used. An OFDM symbol is a time domain unit 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.

[0025] The subcarrier spacing (SCS) is Δf=2 μFor example, the subcarrier spacing configuration μ may be set to any of 0, 1, 2, 3, 4, and / or 5. For a certain BandWidth Part (BWP), the subcarrier spacing configuration μ may be given by a higher layer parameter.

[0026] In the wireless communication system according to one aspect of the present embodiment, a time unit T is used to express the length of the time domain. c The time unit T c is T c =1 / (Δf max N f ) may be given by Δf max may be a maximum value of the subcarrier spacing supported in the wireless communication system according to one aspect of the present embodiment. max is Δf max = 480 kHz. f is N f = 4096. The constant κ can be expressed as κ = Δf max N f / (Δf ref N f,ref ) = 64. Δf ref may be 15 kHz. f,ref may be 2048.

[0027] The constant κ is the reference subcarrier spacing and T c The constant κ may be used for the length of the subframe. The number of slots included in the subframe may be given based at least on the constant κ. ref is the reference subcarrier spacing, and N f,ref is a value corresponding to the reference subcarrier spacing.

[0028] The downlink transmission and / or the uplink transmission is composed of a frame of 10 ms. The frame is composed of 10 subframes. The length of the 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.

[0029] For a given subcarrier spacing setting μ, the number and index of slots contained in the subframe may be given. For example, the first slot number n μ s ranges from 0 to N within a subframe. subframe,μ slot For the subcarrier spacing setting μ, the number and index of the slots contained in the frame may be given. For example, the second slot number n μ s,f is the number of frames from 0 to N frame,μ slot -1. Consecutive N slot symb N OFDM symbols may be included in one slot. slot symb may be given based at least on a slot configuration and / or a part or whole of a cyclic prefix (CP) configuration. The slot configuration may be given by at least a higher layer parameter tdd-UL-DL-ConfigurationCommon. The CP configuration may be given based at least on the higher layer parameters. The CP configuration may be given based at least on dedicated RRC signaling. The first slot number and the second slot number are also referred to as slot numbers (slot indexes).

[0030] FIG. 2 is a diagram showing a N slot symb2A is an example showing the relationship between the subcarrier interval setting μ, the slot setting, and the CP setting. In FIG. 2A, when the slot setting is 0, the subcarrier interval setting μ is 2, and the CP setting is normal cyclic prefix (CP), N slot symb =14, N frame,μ slot =40, N subframe,μ slot In addition, in FIG. 2B, when the slot setting is 0, the subcarrier interval setting μ is 2, and the CP setting is extended cyclic prefix (CP), N slot symb =12, N frame,μ slot =40, N subframe,μ slot = 4. N in slot setting 0 slot symb is N in slot setting 1 slot symb It may correspond to twice the amount.

[0031] In terminal device 1, a common subcarrier spacing setting, slot setting, and CP setting may be performed for each cell, or a different subcarrier spacing setting, slot setting, and CP setting may be performed for each cell. In base station device 3A and base station device 3B, a common subcarrier spacing setting, slot setting, and CP setting may be performed, or a different subcarrier spacing setting, slot setting, and CP setting may be performed.

[0032] Fig. 3 is an example showing the configuration 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 (for example, a transmission time interval (TTI)) defined in a higher layer (for example, a media access control (MAC) or a radio resource control (RRC)).

[0033] For example, the length of the 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 the slot may be given based on at least the length of the OFDM symbol. The length of the OFDM symbol may differ based at least on the subcarrier interval. The length of the OFDM symbol may be given based at least on the number of points of a fast Fourier transform (FFT) used to generate the OFDM symbol. The length of the OFDM symbol may include the length of a cyclic prefix (CP) added to the OFDM symbol. Here, the OFDM symbol may be referred to as a symbol. In addition, when a communication method other than OFDM is used in communication between the terminal device 1 and the base station device 3 (for example, when SC-FDMA or DFT-s-OFDM is used), the generated SC-FDMA symbol and / or DFT-s-OFDM symbol is also referred to as an OFDM symbol. Also, unless otherwise specified, OFDM includes SC-FDMA or DFT-s-OFDM.

[0034] For example, the length of a slot may be 0.125 ms, 0.25 ms, 0.5 ms, or 1 ms. For example, when the subcarrier interval is 15 kHz, the length of a slot may be 1 ms. For example, when the subcarrier interval is 30 kHz, the length of a slot may be 0.5 ms. For example, when the subcarrier interval is 120 kHz, the length of a slot may be 0.125 ms. For example, when the subcarrier interval is 15 kHz, the length of a slot may be 1 ms. For example, when the slot length is 0.125 ms, one subframe may be composed of eight slots. For example, when the slot length is 0.25 ms, one subframe may be composed of four slots. For example, when the slot length is 0.5 ms, one subframe may be composed of two slots. For example, when the slot length is 1 ms, one subframe may be composed of one slot.

[0035] Here, OFDM includes a multi-carrier communication method to which pulse shaping, PAPR reduction, out-of-band emission reduction, filtering, and / or phase processing (e.g., phase rotation, etc.) are applied. The multi-carrier communication method may be a communication method for generating / transmitting a signal in which multiple subcarriers are multiplexed.

[0036] A radio frame may be given by the number of subframes. The number of subframes for a radio frame may be, for example, 10. A radio frame may be given by the number of slots.

[0037] A common radio frame configuration, subframe configuration, and slot configuration may be set for each cell in the terminal device 1, or a different radio frame configuration, subframe configuration, and slot configuration may be set for each cell. A common radio frame configuration, subframe configuration, and slot configuration may be set for the base station device 3A and the base station device 3B, or a different radio frame configuration, subframe configuration, and slot configuration may be set.

[0038] The physical resources will be described below.

[0039] An antenna port is defined by the fact that the channel on which a symbol is transmitted at one antenna port can be estimated from the channel on which another symbol is transmitted at the same antenna port. If the large scale properties of the channel on which a symbol is transmitted at one antenna port can be estimated from the channel on which a symbol is transmitted at the other antenna port, the two antenna ports are said to be Quasi Co-Located (QCL). The large scale properties may include at least long-range properties of the channel. The large scale properties may include at least some or all of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters. The first and second antenna ports being QCL with respect to beam parameters may be that the receiving beam assumed by the receiving side for the first antenna port is the same as the receiving beam assumed by the receiving side for the second antenna port. The first antenna port and the second antenna port being QCLs in terms of beam parameters may mean that a transmission beam assumed by the receiving side for the first antenna port is the same as a transmission beam assumed by the receiving side for the second antenna port. The terminal device 1 may assume that the two antenna ports are QCLs if the large-scale characteristics of a channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at another antenna port. The two antenna ports being QCLs may mean that the two antenna ports are assumed to be QCLs.

[0040] For each subcarrier spacing configuration and set of carriers, N μRB,x N RB sc subcarriers and N (μ) symb N subframe,μ symb Given a resource grid of N OFDM symbols. μ RB,x may denote the number of resource blocks provided for subcarrier spacing setting μ for carrier x. μ RB,x N may be the maximum number of resource blocks given for the subcarrier spacing setting μ for carrier x. Carrier x may indicate either a downlink carrier or an uplink carrier, i.e., x may be “DL” or “UL”. μ RB is N μ RB,DL and / or N μ RB,UL It is a name that includes. RB sc 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 a downlink (DL) and an uplink (UL). Hereinafter, a set of parameters including at least the antenna port p, the subcarrier spacing setting μ, and some or all of the transmission direction settings is also referred to as a first radio parameter set. That is, one resource grid may be provided for each first radio parameter set.

[0041] In the downlink, a carrier included in a serving cell is called a downlink carrier (or a downlink component carrier). In the uplink, a carrier included in a serving cell is called an uplink carrier (or an uplink component carrier). The downlink component carrier and the uplink component carrier are collectively called a component carrier (or a carrier).

[0042] Each element in the resource grid given for each first radio parameter set is called a resource element. A resource element is a frequency domain index k sc and the time domain index l sym For a given first radio parameter set, the resource elements are identified by frequency domain index k sc and the time domain index l sym The frequency domain index k is sc and the time domain index l sym The resource element identified by sc , l sym ) The frequency domain index k sc is from 0 to N μ RB N RB sc It can have any value from -1 to N. μ RB may be the number of resource blocks provided for the subcarrier spacing setting μ. RB sc is the number of subcarriers contained in the resource block, and N RB sc = 12. The frequency domain index k sc is the subcarrier index k sc The time domain index l sym is the OFDM symbol index l sym may also correspond to

[0043] 4 is a schematic diagram showing an example of a resource grid in a subframe according to one embodiment of the present invention. In the resource grid of FIG. 4, the horizontal axis represents a time domain index l sym where 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 sc In one subframe, the time domain of the resource grid is 14 2 μ A resource block may contain N OFDM symbols. RB sc subcarriers. The time domain of the resource block may correspond to one OFDM symbol. The time domain of the resource block may correspond to 14 OFDM symbols. The time domain of the resource block may correspond to one or more slots. The time domain of the resource block may correspond to one subframe.

[0044] FIG. 4 shows an example of a resource grid in one cell.

[0045] The terminal device 1 may be instructed to transmit and receive using only a subset of the resource grid. The subset of the resource grid is also referred to as a BWP, and the BWP may be given based on at least a part or all of the higher layer parameters and / or the DCI. The BWP is also referred to as a band part (BP: Bandwidth Part). That is, the terminal device 1 may not be instructed to transmit and receive using all the sets of the resource grid. That is, the terminal device 1 may be instructed to transmit and receive using some of the frequency resources in the resource grid. One BWP may be composed of multiple resource blocks in the frequency domain. One BWP may be composed of multiple consecutive resource blocks in the frequency domain. A BWP set for a downlink carrier is also referred to as a downlink BWP. A BWP set for an uplink carrier is also referred to as an uplink BWP.

[0046] One or more downlink BWPs may be configured for the terminal device 1. The terminal device 1 may attempt to receive a physical channel (e.g., PDCCH, PDSCH, SS / PBCH, etc.) in one of the one or more downlink BWPs. The one downlink BWP is also referred to as an activated downlink BWP.

[0047] 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. The one uplink BWP is also referred to as an activated uplink BWP.

[0048] A set of downlink BWPs may be configured for each serving cell. The set of downlink BWPs may include one or more downlink BWPs. A set of uplink BWPs may be configured for each serving cell. The set of uplink BWPs may include one or more uplink BWPs.

[0049] The higher layer parameters are parameters included in the 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 RRC layer signals or MAC layer signals.

[0050] The higher layer signal may be a 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 BCCH logical channel or CCCH logical channel Feature C2) Includes at least the radioResourceConfigCommon information element Feature C3) Mapped to PBCH

[0051] The radioResourceConfigCommon information element may include information indicating a configuration commonly used in the serving cell. The configuration commonly used in the serving cell may include at least a configuration of a PRACH. The PRACH configuration may at least indicate one or more random access preamble indices. The PRACH configuration may at least indicate a time / frequency resource of the PRACH.

[0052] The higher layer signaling may be dedicated RRC signaling. The dedicated RRC signaling may comprise at least some or all of the following features D1 to D2: Feature D1) Mapped to DCCH logical channel Feature D2) At least the radioResourceConfigDedicated information element is included

[0053] The radioResourceConfigDedicated information element may include at least information indicating a setting specific to the terminal device 1. The radioResourceConfigDedicated information element may include at least information indicating a setting of a BWP. The setting of the BWP may indicate at least a frequency resource of the BWP.

[0054] 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 that is mapped to the DCCH logical channel and includes at least the radioResourceConfigCommon may be included in the common RRC signaling. Also, an upper layer message that is mapped to the DCCH logical channel and does not include the radioResourceConfigCommon information element may be included in the dedicated RRC signaling. Also, an upper layer message that is mapped to the DCCH logical channel and includes at least the radioResourceConfigDedicated information element may be included in the dedicated RRC signaling.

[0055] The first system information may at least indicate a time index of a Synchronization Signal (SS) block. The SS block is also referred to as an SS / PBCH block. The SS / PBCH block is also referred to as an SS / PBCH. The first system information may include at least information related to a PRACH resource. The first system information may include at least information related to setting up an initial connection. The second system information may be system information other than the first system information.

[0056] The radioResourceConfigDedicated information element may include at least information related to the PRACH resources. The radioResourceConfigDedicated information element may include at least information related to the setup of the initial connection.

[0057] The following describes physical channels and physical signals according to various aspects of the present embodiment.

[0058] An uplink physical channel may correspond to a set of resource elements carrying information generated in a higher layer. An uplink physical channel is a physical channel used in an uplink carrier. In a wireless communication system according to one 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)

[0059] The PUCCH may be used to transmit uplink control information (UCI). The uplink control information includes channel state information (CSI), a scheduling request (SR), and a part or all of a hybrid automatic repeat request ACKnowledgement (HARQ-ACK) corresponding to a transport block (TB, MAC PDU, DL-SCH, PDSCH). Note that the uplink control information may include information not described above.

[0060] The HARQ-ACK may include at least a HARQ-ACK bit (HARQ-ACK information) corresponding to at least one transport block. The HARQ-ACK bit may indicate an ACK (acknowledgement) or a NACK (negative-acknowledgement) corresponding to one or more transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook including one or more HARQ-ACK bits. The HARQ-ACK bit corresponding to one or more transport blocks may mean that the HARQ-ACK bit corresponds to a PDSCH including the one or more transport blocks. The HARQ-ACK bit may indicate an ACK or a NACK corresponding to one CBG (Code Block Group) included in the transport block.

[0061] A scheduling request (SR) may be used at least to request PUSCH resources for initial transmission. A scheduling request bit may be used to indicate either a positive SR or a negative SR. The scheduling request bit indicating a positive SR is also referred to as "a positive SR is transmitted". The positive SR may indicate that a PUSCH resource for initial transmission is requested by the terminal device 1. The positive SR may indicate that a scheduling request is triggered by a higher layer. The positive SR may be transmitted when a scheduling request is instructed to be transmitted by a higher layer. The scheduling request bit indicating a negative SR is also referred to as "a negative SR is transmitted". The negative SR may indicate that a PUSCH resource for initial transmission is not requested by the terminal device 1. The negative SR may indicate that a scheduling request is not triggered by a higher layer. The negative SR may be transmitted when a scheduling request is not instructed to be transmitted by a higher layer.

[0062] The channel state information may include at least some or all of a Channel Quality Indicator (CQI), a Precoder Matrix Indicator (PMI), and a Rank Indicator (RI). The CQI is an index related to the quality of the channel (e.g., propagation strength), the PMI is an index indicating the precoder, and the RI is an index indicating the transmission rank (or the number of transmission layers).

[0063] For the PUCCH, one or more PUCCH formats (PUCCH format 0 to PUCCH format 4) may be supported. The PUCCH format may be mapped to the PUCCH and transmitted. The PUCCH format may be transmitted in the PUCCH. Transmission of the PUCCH format may be transmission of the PUCCH.

[0064] The PUSCH is used at least to transmit transport blocks (TB, MAC PDU, UL-SCH, PUSCH). The PUSCH may be used at least to transmit transport blocks, HARQ-ACK, channel state information, and some or all of a scheduling request. The PUSCH is used at least to transmit a random access message 3. The PUSCH may be used to transmit information not listed above.

[0065] The PRACH is used at least to transmit a random access preamble (random access message 1). The PRACH may be used at least to indicate some or all of an initial connection establishment procedure, a handover procedure, a connection re-establishment procedure, synchronization (timing adjustment) for PUSCH transmission, and a resource request for PUSCH. The random access preamble may be used to notify the base station device 3 of an index (random access preamble index) provided by a higher layer of the terminal device 1.

[0066] In FIG. 1, the following uplink physical signals are used in uplink wireless communication: The uplink physical signals may not be used to transmit information output from higher layers, but are used by the physical layer. ·UL DMRS(UpLink Demodulation Reference Signal) ·SRS(Sounding Reference Signal) ·UL PTRS(UpLink Phase Tracking Reference Signal)

[0067] The UL DMRS is related to the transmission of PUSCH and / or PUCCH. The UL DMRS is multiplexed with PUSCH or PUCCH. The base station device 3 may use the UL DMRS to perform propagation path correction of PUSCH or PUCCH. Hereinafter, transmitting a PUSCH and a UL DMRS related to the PUSCH together is simply referred to as transmitting a PUSCH. Hereinafter, transmitting a PUCCH and a UL DMRS related to the PUCCH together is simply referred to as transmitting a PUCCH. The UL DMRS related to the PUSCH is also referred to as a UL DMRS for PUSCH. The UL DMRS related to the PUCCH is also referred to as a UL DMRS for PUCCH.

[0068] The SRS may not be related to the transmission of the PUSCH or the PUCCH. The base station device 3 may use the SRS for measuring the channel state. The SRS may be transmitted at the end of a subframe in an uplink slot or a predetermined number of OFDM symbols from the end.

[0069] The UL PTRS may be a reference signal used at least for phase tracking. The UL PTRS may be associated with a UL DMRS group including at least an antenna port used for one or more UL DMRSs. The association of the UL PTRS with the UL DMRS group may mean that the antenna port of the UL PTRS and some or all of the antenna ports included in the UL DMRS group are at least QCL. The UL DMRS group may be identified based at least on an antenna port with a smallest index in the UL DMRS included in the UL DMRS group. The UL PTRS may be mapped to an antenna port with a smallest index among one or more antenna ports to which one codeword is mapped. The UL PTRS may be mapped to a first layer when one codeword is mapped to at least a first layer and a second layer. The UL PTRS may not be mapped to the second layer. An index of an antenna port to which the UL PTRS is mapped may be provided based at least on downlink control information.

[0070] In addition, an uplink physical signal not described above may also be used.

[0071] 1, the following downlink physical channels are used in downlink wireless communication from the base station device 3 to the terminal device 1. The downlink physical channels are used by the physical layer to transmit information output from a higher layer. ·PBCH(Physical Broadcast Channel) ·PDCCH (Physical Downlink Control Channel) ·PDSCH(Physical Downlink Shared Channel)

[0072] The PBCH is used at least for transmitting a Master Information Block (MIB, BCH, Broadcast Channel). The PBCH may be transmitted based on a predetermined transmission interval. The PBCH may be transmitted at an interval of 80 ms. The PBCH may be transmitted at an interval of 160 ms. The contents of the information included in the PBCH may be updated every 80 ms. A part 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 an identifier (index) of the synchronization signal. The MIB may include information indicating at least a part of a slot number, a subframe number, and / or a radio frame number in which the PBCH is transmitted.

[0073] The PDCCH is used at least for transmitting 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 a 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 a downlink DCI format. The DCI format used for scheduling the PUSCH is also referred to as an uplink DCI format. The downlink grant is also referred to as a downlink assignment (DL assignment) or a downlink allocation (DL allocation). The uplink DCI format includes at least one or both of DCI format 0_0 and DCI format 0_1.

[0074] DCI format 0_0 is composed of at least some 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

[0075] The DCI format specification field may be used at least to indicate to which of one or more DCI formats the DCI format including the DCI format specification field corresponds, where the one or more DCI formats may be given based at least on some or all of DCI format 1_0, DCI format 1_1, DCI format 0_0, and / or DCI format 0_1.

[0076] The frequency domain resource allocation field may be used at least to indicate allocation of frequency resources for a PUSCH scheduled by a DCI format including the frequency domain resource allocation field. The frequency domain resource allocation field is also referred to as a Frequency Domain Resource Allocation (FDRA) field.

[0077] The time domain resource allocation field may be used at least to indicate an allocation of time resources for a PUSCH scheduled by a DCI format that includes the time domain resource allocation field.

[0078] 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.

[0079] The MCS field may be used at least to indicate a modulation scheme and / or a part or all of a target coding rate for a PUSCH scheduled by a DCI format including the MCS field. The target coding rate may be a target coding rate for a transport block of the PUSCH. The size of the transport block (TBS) may be given based at least on the target coding rate.

[0080] The CSI request field is at least used to indicate CSI reporting. 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.

[0081] DCI format 0_1 ​​is composed of at least some or all of 2A to 2H. 2A) DCI format specific fields 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)

[0082] The UL DAI field is at least used 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 in the PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook transmitted in 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 in 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 in the PUSCH.

[0083] The UL DAI field may indicate a value to which a modulo operation is applied. An example in which 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 by the PUSCH is 0, the UL DAI field indicates "00". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH is 1, the UL DAI field indicates "01". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH is 2, the UL DAI field indicates "10". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH is 3, the UL DAI field indicates "11". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH is 4, the UL DAI field indicates "00". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH is 5, the UL DAI field indicates "01". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH is 6, the UL DAI field indicates "10". When the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH is 7, the UL DAI field indicates "11". In this example, a modulo operation using the value '4' is performed on the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH.

[0084] The terminal device 1 interprets the UL DAI field in consideration of the total number of received PDSCHs. For example, the terminal device 1 receives four PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH indicated by the UL DAI field is four. For example, the terminal device 1 receives three PDSCHs and receives a UL DAI field indicating "00". In this case, the terminal device 1 interprets that the number of PDSCHs in which the corresponding HARQ-ACK is included in the HARQ-ACK codebook transmitted by the PUSCH indicated by the UL DAI field is four, and determines that reception of one PDSCH has been missed.

[0085] The BWP field may be used to indicate the uplink BWP to which the PUSCH scheduled by DCI format 0_1 ​​is mapped.

[0086] The CSI request field is at least used to indicate a CSI report, and the size of the CSI request field may be based at least on a higher layer parameter ReportTriggerSize.

[0087] The downlink DCI format includes at least one or both of DCI format 1_0 and DCI format 1_1.

[0088] DCI format 1_0 is composed of at least some or all of 3A to 3H. 3A) 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

[0089] The timing indication field from the PDSCH to the HARQ feedback may be a field indicating timing K1. When the index of the slot including the last OFDM symbol of the PDSCH is slot n, the index of the slot including the PUCCH or PUSCH including at least the HARQ-ACK corresponding to the transport block included in the PDSCH may be n+K1. When the index of the slot including the last OFDM symbol of the PDSCH is slot n, the index of the slot including the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH including at least the HARQ-ACK corresponding to the transport block included in the PDSCH may be n+K1.

[0090] Hereinafter, the PDSCH-to-HARQ feedback timing indicator field may be referred to as a HARQ indication field.

[0091] The PUCCH resource indication field may be a field indicating the index of one or more PUCCH resources included in a PUCCH resource set.

[0092] DCI format 1_1 is composed of at least some or all of 4A to 4J. 4A) 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 (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

[0093] The BWP field may be used to indicate the downlink BWP to which the PDSCH scheduled by DCI format 1_1 is mapped.

[0094] DCI format 2_0 may be configured to include at least one or more Slot Format Indicators (SFIs).

[0095] 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 a PUSCH is scheduled for a flexible subframe (slot) by a UL grant, the terminal device 1 processes the flexible subframe (slot) as an uplink subframe (slot). When the transmission of a PUSCH is not scheduled for a flexible subframe (slot) by a UL grant, the terminal device 1 monitors PDCCH candidates in the flexible subframe (slot) and performs a process of detecting DL assignment. When reception of a PDSCH is scheduled by DL assignment in a flexible subframe (slot), the terminal device 1 performs processing using the flexible subframe (slot) as a downlink subframe (slot).

[0096] For example, downlink control information including a downlink grant or an uplink grant is transmitted and received on a PDCCH including a Cell-Radio Network Temporary Identifier (C-RNTI).

[0097] In the downlink DCI format, the DCI format 1_0 may use a first format (first type downlink DCI format) including scheduling information for one PDSCH, or a second format (second type downlink DCI format) including scheduling information for multiple (e.g., two) PDSCHs. In the downlink DCI format, the DCI format 1_1 may use a first format including scheduling information for one PDSCH, or a second format including scheduling information for multiple (e.g., two) PDSCHs. For example, the first format includes one frequency domain resource allocation field, one time domain resource allocation field, and one MCS field. For example, the second format includes multiple (e.g., two) frequency domain resource allocation fields, multiple (e.g., two) time domain resource allocation fields, and multiple (e.g., two) MCS fields.

[0098] In various aspects of the present embodiment, unless otherwise specified, the number of resource blocks refers to the number of resource blocks in the frequency domain.

[0099] The downlink grant may be used at least for scheduling one PDSCH in one serving cell. The downlink grant may be used at least for scheduling multiple PDSCHs in multiple serving cells. The downlink grant is used at least for scheduling a PDSCH in the same slot as the slot in which the downlink grant is transmitted. The downlink grant may be used for scheduling a PDSCH in a slot different from the slot in which the downlink grant is transmitted. The uplink grant is used at least for scheduling one PUSCH in one serving cell.

[0100] In addition, various DCI formats may further include fields different from the above-mentioned fields. A field indicating the cumulative number of transmitted PDCCHs (C-DAI: Counter Downlink Assignment Index field) may be included. A field indicating the total number of transmitted PDCCHs (T-DAI: Total Downlink Assignment Index field) may be included.

[0101] The value of K1 (information or parameter indicated by a timing indication field from PDSCH to HARQ feedback) indicated by a DCI format included in the PDCCH may be, for example, a value among {0, 1, 2, ..., 15}. For example, the PDSCH scheduled by the DCI format is transmitted in slot n by the base station device 3 and received by the terminal device 1. The terminal device 1 may transmit (report) HARQ-ACK information corresponding to the PDSCH in slot n+K1 via the PUCCH or PUSCH.

[0102] The HARQ-ACK bit (HARQ-ACK information) corresponding to the transport block transmitted and received in the downlink frequency band (frequency spectrum, carrier, component carrier) of the base station device 3 is transmitted and received in the uplink frequency band (frequency spectrum, carrier, component carrier) of the base station device 3 in the above-mentioned manner based on at least one of the above-mentioned various fields (PDSCH-to-HARQ feedback timing indicator field, HARQ indication field, PUCCH resource indication field, C-DAI field, T-DAI field, UL DAI field) included in the DCI format.

[0103] 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.

[0104] The terminal device 1 may be configured with one or more control resource sets (CORESET: COntrol REsource SET). 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 sets of PDCCH candidates. Also, monitoring the PDCCH may include monitoring and detecting the PDCCH and / or a DCI format transmitted via the PDCCH.

[0105] The control resource set may be a time-frequency region to which one or more PDCCHs may be mapped. The control resource set may be a region in which the terminal device 1 monitors the PDCCH. The control resource set may be configured of continuous resources (localized resources). The control resource set may be configured of non-contiguous resources (distributed resources).

[0106] 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 six 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 one OFDM symbol.

[0107] The mapping of the control resource set to resource blocks may be based at least on higher layer parameters, which may include a bitmap for a group of resource blocks (RBG), which may be provided by six consecutive resource blocks.

[0108] The number of OFDM symbols constituting the control resource set may be given based at least on higher layer parameters. For example, the start positions of the OFDM symbols constituting the control resource set are notified from the base station device 3 to the terminal device 1 using higher layer signaling. For example, the end positions of the OFDM symbols constituting the control resource set are notified from the base station device 3 to the terminal device 1 using higher layer signaling.

[0109] A certain control resource set may be a common control resource set. The common control resource set may be a control resource set commonly set for a plurality of terminal devices 1. The common control resource set may be given based on at least a part or all of the MIB, the first system information, the second system information, the common RRC signaling, and the cell ID. For example, the time resource and / or the frequency resource of the control resource set configured to monitor the PDCCH used for scheduling the first system information may be given based on at least the MIB.

[0110] The control resource set configured in the MIB is also referred to as CORESET#0. CORESET#0 may be the control resource set with index #0.

[0111] 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 used exclusively for the terminal device 1. The dedicated control resource set may be provided based on at least dedicated RRC signaling and a part or all of the value of the C-RNTI. A plurality of control resource sets may be configured in the terminal device 1, and an index (control resource set index) may be assigned to each control resource set. One or more control channel elements (CCEs) may be configured in the control resource set, and an index (CCE index) may be assigned to each CCE.

[0112] A CCE may be configured to include one or more groups of REGs (Resource Element Groups). A group of REGs is also called a REG bundle. The number of REGs constituting one REG group is called a bundle size. For example, the bundle size of a REG may be 1, 2, 3, or 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 in a group of REGs are the same. The terminal device 1 can perform channel estimation assuming that the precoders applied to the REs in a 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 need to assume that the precoders applied to the REs between the groups of REGs are the same. "Between groups of REGs" may be rephrased 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.

[0113] The REG may be configured by one OFDM symbol of one PRB. That is, the REG may be configured by 12 consecutive REs in the frequency domain. Some of the REs configuring the REG may be REs to which the downlink control information is not mapped. The REG may be configured to include REs to which the downlink control information is not mapped, or may be configured to exclude REs to which the downlink control information is not mapped. The RE to which the 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 to which the terminal device 1 assumes that the control channel is not mapped.

[0114] A CCE may be composed of six REGs. A CCE may be composed of REGs that are continuously mapped (such mapping may be called localized mapping) (such mapping may be called non-interleaved CCE-to-REG mapping) (such mapping may be called non-interleaved mapping). It is not necessary that all REGs that constitute a CCE are consecutive in the frequency domain. For example, when all of a plurality of resource blocks that constitute a control resource set are not consecutive in the frequency domain, even if the numbers assigned to the REGs are consecutive, the resource blocks that constitute each REG with consecutive numbers are not consecutive in the frequency domain. When a control resource set is composed of a plurality of OFDM symbols and a plurality of REGs that constitute one CCE are arranged over a plurality of time intervals (OFDM symbols), a CCE may be composed of a group of REGs that are continuously mapped.

[0115] A CCE may be composed of REGs that are non-contiguously mapped (such mapping may be referred to as distributed mapping) (such mapping may be referred to as interleaved CCE-to-REG mapping) (such mapping may be referred to as interleaved mapping). REGs constituting a CCE may be non-contiguously mapped to resources in the time-frequency domain using an interleaver. When a control resource set is composed of multiple OFDM symbols and multiple REGs constituting one CCE are arranged across multiple time intervals (OFDM symbols), a CCE may be composed of REGs that are mixed and non-contiguously mapped. A CCE may be composed of REGs that are distributed and mapped in units of groups of multiple REGs. A CCE may be composed of REGs that are distributed and mapped in units of groups of multiple REGs.

[0116] A set of PDCCH candidates monitored by the terminal device 1 is defined in terms of a search space. That is, the set of PDCCH candidates monitored by the terminal device 1 is given by the search space.

[0117] The search space may be configured to include one or more PDCCH candidates of one or more aggregation levels. The aggregation level of the PDCCH candidate may indicate the number of CCEs constituting the PDCCH. The PDDCH candidate may be mapped to one or more CCEs.

[0118] The number of CCEs that make up a PDCCH candidate is also called the aggregation level (AL). When one PDCCH candidate is composed of an aggregation of multiple CCEs, the PDCCH candidate is composed of multiple CCEs with consecutive CCE numbers. X The set of PDCCH candidates is at aggregation level AL X In other words, the aggregation level ALX The search area of ​​is the aggregation level AL X A search space may be configured to include one or more PDCCH candidates of a CSS. Also, a search space may include PDCCH candidates of multiple aggregation levels. For example, a CSS may include PDCCH candidates of multiple aggregation levels. For example, a USS may include PDCCH candidates of multiple aggregation levels. A set of aggregation levels of PDCCH candidates included in a CSS and a set of aggregation levels of PDCCH candidates included in a USS may be defined / configured, respectively.

[0119] The terminal device 1 may monitor at least one or more search space in a slot where DRX (Discontinuous reception) is not set. DRX may be provided based at least on higher layer parameters. The terminal device 1 may monitor at least one or more search space sets in a slot where DRX is not set. A plurality of search space sets may be configured in the terminal device 1. An index (search space set index) may be assigned to each search space set.

[0120] The search area set may be configured to include at least one or more search areas. An index (search area index) may be assigned to each search area.

[0121] Each of the search space sets may be associated with at least 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.

[0122] The search space may have two types, a common search space (CSS) and a UE-specific search space (USS). The CSS may be a search space set in common for a plurality of terminal devices 1. The USS may be a search space including settings used exclusively for an individual terminal device 1. The CSS may be given based on at least a synchronization signal, a MIB, first system information, second system information, common RRC signaling, dedicated RRC signaling, a cell ID, and the like. The USS may be given based on at least a value of dedicated RRC signaling and / or a C-RNTI. The CSS may be a search space set in a resource (control resource element) common to a plurality of terminal devices 1. The USS may be a search space set in a resource (control resource element) for each individual terminal device 1.

[0123] The CSS may use a type 0 PDCCH CSS for a DCI format scrambled by an SI-RNTI used for transmitting system information in a primary cell, and a type 1 PDCCH CSS for a DCI format scrambled by an RA-RNTI and a TC-RNTI used for initial access. The CSS may use a type PDCCH CSS for a DCI format scrambled by a CC-RNTI used for unlicensed access. The terminal device 1 can monitor PDCCH candidates in those search spaces. The DCI format scrambled by a predetermined RNTI may be a DCI format to which a CRC (Cyclic Redundancy Check) scrambled by a predetermined RNTI is added.

[0124] The information related to reception of the PDCCH may include information related to an ID indicating a destination of the PDCCH. The ID indicating the destination of the PDCCH may be an ID used for scrambling the CRC bits added to the PDCCH. The ID indicating the destination of the PDCCH is also referred to as an RNTI (Radio Network Temporary Identifier). The information related to reception of the PDCCH may include information related to an ID used for scrambling the CRC bits added to the PDCCH. The terminal device 1 can attempt to receive the PDCCH based at least on the information related to the ID included in the PBCH.

[0125] 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 including the system information and transmitted. The P-RNTI is used at least for scheduling the PDSCH including information such as paging information and / or a system information change notification and the like and transmitted. 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, and the INT-RNTI is used at least for indicating pre-emption in the downlink.

[0126] Note that the PDCCH and / or DCI included in the CSS does not need to include a carrier indicator field (CIF) indicating which serving cell (or which component carrier) the PDCCH / DCI is scheduling the PDSCH or PUSCH for.

[0127] In addition, when carrier aggregation (CA), which aggregates multiple serving cells and / or multiple component carriers to communicate (transmit and / or receive), is configured for the terminal device 1, the PDCCH and / or DCI included in the USS for a specific serving cell (specific 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.

[0128] In addition, when communication is performed using one serving cell and / or one component carrier for terminal device 1, the PDCCH and / or DCI included in the USS does not need to include a CIF indicating which serving cell and / or which component carrier the PDCCH / DCI is scheduling the PDSCH or PUSCH for.

[0129] The common control resource set may include a CSS. The common control resource set may include both a CSS and a USS. The dedicated control resource set may include a USS. The dedicated control resource set may include a CSS.

[0130] The physical resources of the search area are composed of control channel units (CCEs). Each CCE is composed of a predetermined number of resource element groups (REGs). For example, a CCE may be composed of six REGs. A REG may be composed of one OFDM symbol of one PRB (Physical Resource Block). In other words, a REG may be composed of 12 resource elements (REs). A PRB is also simply called an RB (Resource Block).

[0131] That is, the terminal device 1 can detect the PDCCH and / or DCI for the terminal device 1 by blindly detecting PDCCH candidates included in a search space in a control resource set.

[0132] 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 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 CCEs constituting the search space, and may be specified / 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 specified / set for each of a plurality of aggregation levels. Note that the UGSS may be a search space commonly assigned to one or more terminal devices 1. The GCSS may be a search space in which DCI including parameters related to CSS is mapped for one or more terminal devices 1. Note that the aggregation level indicates an aggregation level for a predetermined number of CCEs, and is related to the total number of CCEs that make up one PDCCH and / or search space.

[0133] The magnitude of the aggregation level may be associated with the coverage corresponding to the PDCCH and / or the search area or the size of the DCI included in the PDCCH and / or the search area (DCI format size, payload size).

[0134] In addition, when the start position (start symbol) of the PDCCH symbol is set for one control resource set, and when more than one PDCCH in the control resource set can be detected in a predetermined period, 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 may be set for the time domain corresponding to each start symbol. When the start position (start symbol) of the PDCCH symbol is more than one for one control resource set, that is, when there are multiple timings for blindly detecting (monitoring) the PDCCH in a predetermined period, 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 may be set for the time domain corresponding to each start symbol. The type of search space, 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, or may be provided / set via DCI and / or higher layer signals (RRC signaling), or may be specified / set in advance by a specification. In addition, the number of PDCCH candidates may be the number of PDCCH candidates in a predetermined period. The predetermined period may be 1 millisecond. The predetermined period may be 1 microsecond. The predetermined period may be a period of one slot. The predetermined period may be a period of one OFDM symbol.

[0135] Note that, as a method of indicating the number of PDCCH candidates, a configuration may be used in which the number to be reduced from a predetermined number of PDCCH candidates is specified / set for each aggregation level.

[0136] The terminal device 1 may transmit / notify capability information related to blind detection to the base station device 3. The terminal device 1 may transmit / notify the number of PDCCH candidates that can be processed in one subframe as capability information related to PDCCH to the base station device 3. When more than a predetermined number of control resource sets can be configured for one or more serving cells / component carriers, the terminal device 1 may transmit / notify the capability information related to blind detection to the base station device 3.

[0137] The terminal device 1 may transmit / notify capability information related to blind detection to the base station device 3 if more than a predetermined number of control resource sets can be configured for a predetermined period of one or more serving cells / component carriers.

[0138] The capability information related to the blind detection may include information indicating the maximum number of blind detections in a predetermined period. The capability information related to the blind detection may include information indicating that PDCCH candidates can be reduced. 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 control resource sets and the maximum number of serving cells and / or component carriers that can monitor the PDCCH may be set as individual parameters or may be set as a common parameter. The capability information related to the blind detection may include information indicating the maximum number of control resource sets that can be simultaneously blind detected in a predetermined period.

[0139] If the terminal device 1 does not support the capability of detecting (blind detection) more than a predetermined number of control resource sets in a predetermined period, the terminal device 1 may not transmit / notify capability information related to the blind detection. If 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 the predetermined number for the blind detection, and transmit the PDCCH.

[0140] The settings related to the control resource set include a parameter indicating an index (ControlResourceSetId) for identifying the control resource set. The settings related to the control resource set may also include a parameter indicating a frequency resource region of the control resource set (the number of resource blocks constituting the control resource set). The settings related to the control resource set may also include a parameter indicating a type of mapping from CCE to REG. The settings related to the control resource set may also include a 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.

[0141] The search space-related configuration includes a parameter indicating an index (search space index) for identifying the search space. The search space-related configuration includes a parameter indicating an index of a control resource set in which the search space is arranged. The search space-related configuration may include a parameter indicating a period and an offset of a slot in which the search space is arranged. The search space-related configuration may include a parameter indicating the number of slots in which the search space is consecutively arranged. The search space-related configuration may include a parameter indicating an OFDM symbol in a slot in which PDCCH candidates are monitored. The search space-related configuration may include a parameter indicating the number of PDCCH candidates in which monitoring is performed for each CCE aggregation level. The search space-related configuration may include a parameter indicating a DCI format in which monitoring is performed. The search space-related configuration may include a parameter indicating a type of the search space (CSS or USS). RRC signaling may be used for transmitting and receiving a message indicating the search space-related configuration. A SIB may be used for transmitting and receiving a message indicating the search space-related configuration. A MIB may be used for transmitting and receiving a message indicating the search space-related configuration.

[0142] As a parameter indicating the DCI format for which monitoring is performed, a downlink grant including scheduling information of multiple (e.g., two) PDSCHs may be included in the configuration for the search space. As a parameter indicating the DCI format for which monitoring is performed, a downlink grant including scheduling information of PDSCHs of multiple (e.g., two) cells may be included in the configuration for the search space. As a parameter indicating the DCI format for which monitoring is performed, a downlink grant including scheduling information of multiple (e.g., two) PDSCHs of multiple (e.g., two) cells may be included in the configuration for the search space. Here, the multiple cells may be the cell in which the search space is set and the cell to which cross-carrier scheduling is applied from the cell in which the search space is set.

[0143] For example, the above is applied as a setting for a search space for a certain SCell. A downlink grant including the scheduling information of the PDSCH received by the SCell and the scheduling information of the PDSCH received by the PCell is set. Also, a downlink grant including only the scheduling information of the PDSCH received by the SCell is set. Also, a downlink grant including the scheduling information of the PDSCH received by the SCell and the scheduling information of the PDSCH received by the PCell, and a downlink grant including only the scheduling information of the PDSCH received by the SCell are set.

[0144] Base station device 3 sets a search area for terminal device 1. Base station device 3 transmits setting information regarding the search area to terminal device 1. Terminal device 1 receives setting information regarding the search area from base station device 3. Terminal device 1 sets a search area based on the information received from base station device 3.

[0145] The terminal device 1 that has received the configuration regarding the search space of the SCell first monitors the downlink grant (first type downlink DCI format) including only the scheduling information of the PDSCH of the SCell in the SCell. When the terminal device 1 detects the downlink grant including only the scheduling information of the PDSCH of the SCell, the terminal device 1 adds the downlink grant (second type downlink DCI format) including the scheduling information of the PDSCH of the SCell and the scheduling information of the PDSCH of the PCell as the downlink grant to be monitored in the SCell, and starts monitoring those downlink grants in the SCell. If the terminal device 1 does not detect a downlink grant including scheduling information of the PDSCH of the SCell and scheduling information of the PDSCH of the PCell for a certain period of time, it stops monitoring the downlink grant including the scheduling information of the PDSCH of the SCell and the scheduling information of the PDSCH of the PCell (second type downlink DCI format), and monitors only the downlink grant including only the scheduling information of the PDSCH of the SCell (first type downlink DCI format) in the SCell, and monitors the downlink grant in the SCell.

[0146] The base station device 3, which has transmitted a setting related to the search space of the SCell to the terminal device 1, uses a downlink grant (first type downlink DCI format) including only the scheduling information of the PDSCH of the SCell as a downlink grant to be transmitted by the SCell of the terminal device 1. After transmitting the downlink grant including only the scheduling information of the PDSCH of the SCell to the terminal device 1, the base station device 3 starts to use a downlink grant (second type downlink DCI format) including the scheduling information of the PDSCH of the SCell and the scheduling information of the PDSCH of the PCell as a downlink grant to be transmitted by the SCell of the terminal device 1. The base station device 3 transmits to the terminal device 1 a downlink grant (second type downlink DCI format) including the scheduling information of the PDSCH of the SCell and the scheduling information of the PDSCH of the PCell. If the base station device 3 does not transmit a downlink grant including scheduling information of the PDSCH of the SCell and scheduling information of the PDSCH of the PCell to the terminal device 1 for a certain period of time, the base station device 3 stops using the downlink grant including scheduling information of the PDSCH of the SCell and scheduling information of the PDSCH of the PCell (second type downlink DCI format) for transmission as the downlink grant to be transmitted by the SCell of the terminal device 1, and uses only the downlink grant including only scheduling information of the PDSCH of the SCell (first type downlink DCI format).

[0147] In the above, a timer is used for measuring a certain period of time. This timer is used to determine whether to switch on / off monitoring of the second type of downlink DCI format and whether to use the second type of downlink DCI format. This timer is used to determine whether to switch on / off monitoring of the downlink grant and whether to use the downlink grant. This timer is used to determine whether to stop monitoring of the second type of downlink DCI format. The base station device 3 transmits information about the timer (information indicating the timer value) to the terminal device 1. The terminal device 1 receives information about the timer (information indicating the timer value) from the base station device 3. The base station device 3 times the timer and determines the downlink grant to be used for transmission. The terminal device 1 times the timer and determines the downlink grant to be monitored.

[0148] The PDSCH is at least used to transmit / receive a transport block. The PDSCH may be at least used to transmit / receive a random access message 2 (random access response). The PDSCH may be at least used to transmit / receive system information including parameters used for initial access.

[0149] In FIG. 1, the following downlink physical signals are used in downlink wireless communication: The downlink physical signals may not be used to transmit information output from higher layers, but are used by the physical layer. ·Synchronization signal (SS) ·DL DMRS(DownLink DeModulation Reference Signal) ·CSI-RS(Channel State Information-Reference Signal) ·DL PTRS(DownLink Phase Tracking Reference Signal)

[0150] The synchronization signal is used for the terminal device 1 to synchronize the frequency domain and / or the time domain of the downlink. The synchronization signal includes a PSS (Primary Synchronization Signal) and an SSS (Secondary Synchronization Signal).

[0151] An SS block (SS / PBCH block) is configured to include at least a part or all of a PSS, an SSS, and a PBCH.

[0152] The DL DMRS is related to the transmission of the PBCH, the PDCCH, and / or the PDSCH. The DL DMRS is multiplexed into the PBCH, the PDCCH, and / or the PDSCH. The terminal device 1 may use the DL DMRS corresponding to the PBCH, the PDCCH, or the PDSCH to perform propagation path correction of the PBCH, the PDCCH, or the PDSCH. The terminal device 1 may determine that the base station device 3 is transmitting a signal based on detection of the DL DMRS.

[0153] The CSI-RS may be a signal that is at least used to calculate channel state information. The pattern of CSI-RS assumed by the terminal device 1 may be given by at least higher layer parameters.

[0154] The PTRS may be a signal that is at least used for phase noise compensation. The pattern of the PTRS assumed by the terminal device 1 may be given based on at least higher layer parameters and / or DCI.

[0155] A DL PTRS may be associated with a DL DMRS group that includes at least the antenna ports used for one or more DL DMRSs.

[0156] In addition, a downlink physical signal not described above may also be used.

[0157] The downlink physical channels and downlink physical signals are also referred to as downlink signals. The uplink physical channels and uplink physical signals are also referred to as uplink signals. The downlink signals and uplink signals are also collectively referred to as physical signals. The downlink signals and uplink signals are also collectively referred to as signals. The downlink physical channels and uplink physical channels are collectively referred to as physical channels. The downlink physical signals and uplink physical signals are collectively referred to as physical signals.

[0158] The BCH (Broadcast CHannel), UL-SCH (Uplink-Shared CHannel), and DL-SCH (Downlink-Shared CHannel) are transport channels. A channel used in the Medium Access Control (MAC) layer is called a transport channel. The unit of the transport channel used in the MAC layer is also called a transport block (TB) or MAC PDU. In the MAC layer, HARQ (Hybrid Automatic Repeat reQuest) control is performed for each transport block. A transport block is a unit of data that the MAC layer delivers to the physical layer. In the physical layer, the transport block is mapped to a codeword, and modulation processing is performed for each codeword.

[0159] The base station device 3 and the terminal device 1 exchange (transmit and receive) higher layer signals in a 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 a Radio Resource Control (RRC) layer. The base station device 3 and the terminal device 1 may also transmit and receive MAC CE (Control Element) in a MAC layer. Here, the RRC signaling and / or MAC CE are also referred to as higher layer signaling.

[0160] The PUSCH and the PDSCH may be used at least for transmitting RRC signaling and / or MAC CE. Here, the RRC signaling transmitted by the base station device 3 on the PDSCH may be signaling common to a plurality of terminal devices 1 in a serving cell. The signaling common to a plurality of terminal devices 1 in a serving cell is also referred to as common RRC signaling. The RRC signaling transmitted by the base station device 3 on the PDSCH may be signaling dedicated to a certain terminal device 1 (also referred to as dedicated signaling or UE specific signaling). The signaling dedicated to a terminal device 1 is also referred to as dedicated RRC signaling. The upper layer parameters specific to the serving cell may be transmitted / received using signaling common to a plurality of terminal devices 1 in the serving cell or signaling dedicated to a certain terminal device 1. The upper layer parameters specific to the UE may be transmitted / received using signaling dedicated to a certain terminal device 1.

[0161] The BCCH (Broadcast Control CHannel), CCCH (Common Control CHannel), and DCCH (Dedicated Control CHannel) are logical channels. For example, the BCCH is an upper layer channel used for transmitting / receiving an MIB. Also, the CCCH (Common Control CHannel) is an upper layer channel used for transmitting / receiving information common to a plurality of terminal devices 1. Here, the CCCH may be used, for example, for a terminal device 1 that is not RRC-connected. Also, the DCCH (Dedicated Control CHannel) is an upper layer channel that is used at least for transmitting / receiving control information dedicated to the terminal device 1. Here, the DCCH may be used, for example, for a terminal device 1 that is RRC-connected.

[0162] The BCCH in the logical channel may be mapped to the BCH, DL-SCH, or UL-SCH in the transport channel. The CCCH in the logical channel may be mapped to the DL-SCH or UL-SCH in the transport channel. The DCCH in the logical channel may be mapped to the DL-SCH or UL-SCH in the transport channel.

[0163] The UL-SCH in the transport channel may be mapped to the PUSCH in the physical channel, the DL-SCH in the transport channel may be mapped to the PDSCH in the physical channel, and the BCH in the transport channel may be mapped to the PBCH in the physical channel.

[0164] An example of the configuration of the terminal device 1 according to one aspect of this embodiment will be described below.

[0165] 5 is a schematic block diagram showing a configuration of a terminal device 1 according to an embodiment of the present invention. As shown in the figure, the terminal device 1 includes a radio transmission / reception unit 10 and an upper layer processing unit 14. The radio transmission / reception unit 10 includes at least an antenna unit 11, an RF (Radio Frequency) unit 12, and a part or all of a baseband unit 13. The upper layer processing unit 14 includes at least a medium access control layer processing unit 15, and a part or all of a radio resource control layer processing unit 16. The radio transmission / reception unit 10 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

[0166] The physical layer processing unit includes a decoding unit. A receiving unit (also referred to as a receiving 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 a blind decoding process on a received signal of a resource corresponding to a PDCCH candidate of the USS. The decoding unit of the terminal device 1 performs a blind decoding process on a received signal of a resource corresponding to a PDCCH candidate of the CSS. The receiving processing unit of the terminal device 1 monitors the PDCCH candidates in a control resource set. The receiving processing unit of the terminal device 1 monitors the PDCCH candidates in a control resource set. The decoding unit of the terminal device 1 performs different blind decoding processes for each DCI format of a different size.

[0167] The reception processing unit of the terminal device 1 monitors PDCCH candidates within a control resource set of a downlink frequency band (cell, component carrier, carrier) managed in the base station device 3. The reception processing unit of the terminal device 1 monitors PDCCH candidates assuming a first type of downlink DCI format. The reception processing unit of the terminal device 1 monitors PDCCH candidates assuming a second type of downlink DCI format. The reception processing unit of the terminal device 1 switches on / off the monitoring of the second type of downlink DCI format to monitor PDCCH candidates. When the reception processing unit of the terminal device 1 detects the first type of downlink DCI format, it starts monitoring the second type of downlink DCI format and monitors the PDCCH candidates. The reception processing unit of the terminal device 1 monitors PDCCH candidates assuming the second type of downlink DCI format from the start of monitoring the second type of downlink DCI format until a timer expires. The reception processing unit of the terminal device 1 monitors PDCCH candidates assuming the second type of downlink DCI format from when the second type of downlink DCI format is detected until the timer expires. That is, when the terminal device 1 detects the second type of downlink DCI format, it resets the timer and restarts the timer. When the timer expires, the reception processing unit of the terminal device 1 stops monitoring the second type of downlink DCI format and monitors PDCCH candidates. The reception processing unit of the terminal device 1 receives the PDSCH. The reception processing unit of the terminal device 1 performs processing to receive the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by the base station device 3. The reception processing unit of the terminal device 1 performs processing such as demodulation and decoding on the PDSCH.

[0168] The transmitting unit (also referred to as a transmission processing unit) of the terminal device 1 transmits a HARQ-ACK. The transmitting processing unit of the terminal device 1 transmits a HARQ-ACK for the PDSCH. The transmitting processing unit of the terminal device 1 transmits a HARQ-ACK in an uplink frequency band (cell, component carrier, carrier) managed in the base station device 3. The transmitting processing unit of the terminal device 1 transmits a HARQ-ACK for the PDSCH in a downlink frequency band (cell, component carrier, carrier) managed in the base station device 3. The transmitting processing unit of the terminal device 1 transmits a HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed in the base station device 3 in the uplink frequency band (cell, component carrier, carrier) managed in the base station device 3.

[0169] The upper layer processing unit 14 outputs uplink data (transport block) generated by a user operation or the like to the wireless transceiver unit 10. The upper layer processing unit 14 performs processing of the MAC layer, the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer, and the RRC layer.

[0170] The medium access control layer processing unit 15 included in the upper layer processing unit 14 performs processing of the MAC layer.

[0171] The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing of the RRC layer. 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 an 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 information indicating the various setting information / parameters received from the base station device 3. The setting information may include information related to processing or setting of a physical channel or physical signal (i.e., a physical layer), a MAC layer, a PDCP layer, an RLC layer, and an RRC layer. The parameters may be upper layer parameters.

[0172] 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 space in the control resource set. The radio resource control layer processing unit 16 sets PDCCH candidates to be monitored in the control resource set. The radio resource control layer processing unit 16 sets the number of PDCCH candidates to be monitored in the control resource set. The radio resource control layer processing unit 16 sets an aggregation level of the PDCCH candidates to be monitored in the control resource set.

[0173] The radio resource control layer processing unit 16 sets a DCI format to be monitored in the control resource set. Based on RRC signaling indicating monitoring of a second type DCI format from the base station device 3, the radio resource control layer processing unit 16 sets a DCI format to be monitored in the control resource set. The radio resource control layer processing unit 16 receives RRC signaling from the base station device 3 including cross-carrier scheduling information indicating that scheduling information of the PDSCH of the PCell is transmitted and received on the SCell. The cross-carrier scheduling information may be information indicating that the control resource set configured for the SCell includes scheduling information for the PDSCH of the PCell. The cross-carrier scheduling information may explicitly include information indicating that the second type DCI format is used. The radio resource control layer processing unit 16 sets one or more DCI formats to be monitored in the reception processing unit.

[0174] The wireless transceiver 10 performs physical layer processing such as modulation, demodulation, encoding, and decoding. The wireless transceiver 10 separates, demodulates, and decodes the received physical signal, and outputs the decoded information to the upper layer processing unit 14. The wireless transceiver 10 generates a physical signal by modulating, encoding, and generating a baseband signal (converting into a time-continuous signal) on the data, and transmits the physical signal to the base station device 3.

[0175] The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal by quadrature demodulation (down-converts) and removes unnecessary frequency components. The RF unit 12 outputs the processed analog signal to the baseband unit.

[0176] The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 removes a portion corresponding to a CP (Cyclic Prefix) from the converted digital signal, and performs a Fast Fourier Transform (FFT) on the signal from which the CP has been removed to extract a signal in the frequency domain.

[0177] The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the data to generate an OFDM symbol, adds a CP to the generated OFDM symbol, generates 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.

[0178] The RF unit 12 uses a low-pass filter to remove unnecessary frequency components from the analog signal input from the baseband unit 13, up-converts the analog signal to a carrier frequency, and transmits it via the antenna unit 11. The RF unit 12 also amplifies power. The RF unit 12 may also have a function of controlling transmission power. The RF unit 12 is also referred to as a transmission power control unit.

[0179] The terminal device 1 receives a PDCCH. The terminal device 1 receives a 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 space. 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 space based on RRC signaling. The receiving unit of the terminal device 1 monitors a plurality of PDCCH candidates within the search space of the set control resource set. The receiving unit of the terminal device 1 monitors a plurality of PDCCH candidates within the search space of the set control resource set in a certain slot. The receiving unit of the terminal device 1 monitors the PDCCH candidates assuming a DCI format. The decoding unit of the terminal device 1 decodes the monitored PDCCH candidates. The decoding unit of the terminal device 1 decodes the PDCCH candidates to obtain a downlink DCI format and recognizes the scheduling information of the PDSCH. The decoding unit of the terminal device 1 decodes the received PDSCH.

[0180] The receiver of the terminal device 1 monitors a number of PDCCH candidates set based on RRC signaling within a search area of ​​a control resource set in a certain slot. The receiver of the terminal device 1 monitors PDCCH candidates consisting of one or more OFDM symbols set based on RRC signaling within a search area of ​​a control resource set in a certain slot. The receiver of the terminal device 1 may set three or more search areas in a certain slot, each of which is a search area of ​​a different OFDM symbol, and monitor PDCCH candidates distributed in the slot. The receiver of the terminal device 1 monitors PDCCH candidates assuming a DCI format set based on RRC signaling. When a second type of downlink DCI format is set based on RRC signaling, the receiver of the terminal device 1 switches on / off monitoring of the second type of downlink DCI format in the SCell to monitor PDCCH candidates.

[0181] An example of the configuration of the base station device 3 according to one aspect of this embodiment will be described below.

[0182] 6 is a schematic block diagram showing a configuration of a base station device 3 according to an aspect of the present embodiment. As shown in the figure, the base station device 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 medium 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 transmitting unit, a receiving unit, or a physical layer processing unit.

[0183] The upper layer processing unit 34 performs processing for the MAC layer, the PDCP layer, the RLC layer, and the RRC layer.

[0184] The medium access control layer processing unit 35 included in the upper layer processing unit 34 performs processing of the MAC layer.

[0185] 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) arranged in the PDSCH, system information, an RRC message, a MAC CE, and the like, or acquires them from an upper node, and outputs them to the radio transmitting / receiving unit 30. The radio resource control layer processing unit 36 ​​also 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 an upper layer. That is, the radio resource control layer processing unit 36 ​​transmits / reports information indicating various setting information / parameters. The setting information may include information related to processing or setting of a physical channel or a physical signal (i.e., a physical layer), a MAC layer, a PDCP layer, an RLC layer, and an RRC layer. The parameters may be upper layer parameters.

[0186] The radio resource control layer processing unit 36 ​​sets a control resource set for the terminal device 1. Multiple PDCCH candidates are configured (set) within the set control resource set. The radio resource control layer processing unit 36 ​​sets a search space for the terminal device 1. The radio resource control layer processing unit 36 ​​sets a DCI format to be monitored in the search space for the terminal device 1. The radio resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK for the terminal device 1.

[0187] The radio resource control layer processing unit 36 ​​sets a DCI format to be applied to the terminal device 1 in the control resource set. The radio resource control layer processing unit 36 ​​generates RRC signaling indicating the DCI format to be applied to the terminal device 1. The radio resource control layer processing unit 36 ​​sets a second type of downlink DCI format for the terminal device 1 with respect to the control resource set. The radio resource control layer processing unit 36 ​​generates RRC signaling including cross-carrier scheduling information indicating that scheduling information of the PDSCH of the PCell is transmitted and received on the SCell. The cross-carrier scheduling information may be information indicating that the control resource set configured for the SCell includes scheduling information for the PDSCH of the PCell. The cross-carrier scheduling information may explicitly include information indicating that the second type of DCI format is used. The radio resource control layer processing unit 36 ​​sets one or more DCI formats to be applied in the transmission processing unit.

[0188] The functions of the wireless transmission / reception unit 30 are similar to those of the wireless transmission / reception unit 10, and therefore description thereof will be omitted as appropriate. The wireless transmission / reception unit 30 grasps the SS (Search space) configured in the terminal device 1. The wireless transmission / reception unit 30 grasps the search space in the control resource set configured in the terminal device 1. The wireless transmission / reception unit 30 grasps the PDCCH candidates monitored in the terminal device 1 to grasp the search space. The wireless transmission / reception unit 30 grasps which control channel element constitutes each PDCCH candidate monitored in the terminal device 1 (understands the number of the control channel element in which the PDCCH candidate is constituted). The wireless transmission / reception 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 in 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 number of the PDCCH candidate) configured in the search space of the control resource set of the terminal device 1.

[0189] The SS grasping unit grasps the configuration of the search space in the control resource set (the number of PDCCH candidates, the OFDM symbols of the PDCCH candidates, and the aggregation level of the PDCCH candidates). The transmitting unit (transmission processing unit) of the wireless transmitting / receiving unit 30 transmits the PDCCH to the terminal device 1 using the PDCCH candidates in the search space of the control resource set. The transmission processing unit of the base station device 3 transmits the PDCCH using the first type of downlink DCI format. The transmission processing unit of the base station device 3 transmits the PDCCH using the second type of downlink DCI format. The transmission processing unit of the base station device 3 switches on / off the monitoring use of the second type of downlink DCI format and transmits the PDCCH. After transmitting the PDCCH using the first type of downlink DCI format, the transmission processing unit of the base station device 3 switches on the use of the second type of downlink DCI format and transmits the PDCCH. The transmission processing unit of the base station device 3 sets the state in which the second type of downlink DCI format is usable from the time when the use of the second type of downlink DCI format is switched on until the timer expires. The transmission processing unit of the base station device 3 enables the use of the second type of downlink DCI format from the time the second type of downlink DCI format is used (transmitted) until the timer expires. That is, the transmission processing unit of the base station device 3 resets the timer after transmitting the second type of downlink DCI format and restarts the timer. When the timer expires, the transmission processing unit of the base station device 3 stops the use of the second type of downlink DCI format in the SCell and enables the use of only the first type of downlink DCI format in the SCell.

[0190] The receiving unit (also referred to as a receiving processing unit) of the base station device 3 receives the HARQ-ACK. The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH. The receiving processing unit of the base station device 3 receives the HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The receiving processing unit of the base station device 3 receives the HARQ-ACK for the PDSCH in the downlink frequency band (cell, component carrier, carrier) in the uplink frequency band (cell, component carrier, carrier).

[0191] Each of the units denoted by reference numerals 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the units denoted by reference numerals 30 to 36 in the base station device 3 may be configured as a circuit.

[0192] The terminal device 1 transmits uplink control information (UCI) to the base station device 3. The terminal device 1 may multiplex the UCI onto a PUCCH and transmit the same. The terminal device 1 may multiplex the UCI onto a PUSCH and transmit the same. The UCI may include at least one of downlink channel state information (CSI), a scheduling request (SR) indicating a request for a PUSCH resource, 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).

[0193] 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.

[0194] 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 include at least a HARQ-ACK bit corresponding to at least one transport block. The HARQ-ACK bit may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or more transport blocks. The HARQ-ACK may include at least a HARQ-ACK codebook including one or more HARQ-ACK bits. The HARQ-ACK bit corresponding to one or more transport blocks may correspond to a PDSCH including the one or more transport blocks.

[0195] HARQ control for one transport block may be referred to as an HARQ process. One HARQ process identifier may be given for each HARQ process. The DCI format includes a field indicating the HARQ process identifier.

[0196] An NDI (New Data Indicator) is indicated in a DCI format for each HARQ process. For example, an NDI field is included in a DCI format (DL assignment) including scheduling information of a PDSCH. The NDI field is 1 bit. The terminal device 1 stores (stores) an NDI value for each HARQ process. The base station device 3 stores (stores) an NDI value for each HARQ process for each terminal device 1. The terminal device 1 updates the stored NDI value using the NDI field of the detected DCI format. The base station device 3 sets the updated NDI value or the non-updated NDI value in the NDI field of the DCI format and transmits it to the terminal device 1. The terminal device 1 updates the stored NDI value 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.

[0197] The terminal device 1 judges whether the received transport block is a new transmission or a retransmission based on the value of the NDI field of the DCI format (DL assignment). The terminal device 1 compares the value of the NDI field of the detected DCI format with the value of the NDI previously received for the transport block of a certain HARQ process, and judges that the received transport block is a new transmission if the value is toggled. When the base station device 3 transmits a transport block of a new transmission 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 transport block of a retransmission 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 value of the NDI previously received for the transport block of a certain HARQ process, and judges that the received transport block is a retransmission if the value is not toggled (if they are the same). Note that toggling here means switching to a different value.

[0198] 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 corresponding to PDSCH reception or DCI format 1_1.

[0199] 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 higher layer parameter dl-DataToUL-ACK. The number of slots 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, a HARQ-ACK indicating a decoding status of PDSCH (downlink data) transmitted in slot n may be reported (transmitted) in slot n+K1.

[0200] dl-DataToUL-ACK indicates a list of timings of HARQ-ACK for PDSCH. The timing is the number of slots between the slot in which PDSCH is received (or the slot containing the last OFDM symbol to which PDSCH is mapped) and the slot in which HARQ-ACK for the received PDSCH is transmitted. For example, dl-DataToUL-ACK is a list of 1, 2, 3, 4, 5, 6, 7, or 8 timings. If dl-DataToUL-ACK is a list of 1 timing, the HARQ indication field is 0 bits. If dl-DataToUL-ACK is a list of 2 timings, the HARQ indication field is 1 bit. If dl-DataToUL-ACK is a list of 3 or 4 timings, the HARQ indication field is 2 bits. If dl-DataToUL-ACK is a list of 5, 6, 7, or 8 timings, the HARQ indication field is 3 bits. For example, the dl-DataToUL-ACK consists of a list of timings whose values ​​range from 0 to 31. For example, the dl-DataToUL-ACK consists of a list of timings whose values ​​range from 0 to 63.

[0201] The size of dl-DataToUL-ACK is defined as the number of elements it contains. para The index of dl-DataToUL-ACK indicates the order (number) of the elements of dl-DataToUL-ACK. For example, if the size of dl-DataToUL-ACK is 8 (L para = 8), the index of dl-DataToUL-ACK is one of the values ​​1, 2, 3, 4, 5, 6, 7, or 8. The index of dl-DataToUL-ACK may be given, indicated, or indicated by the value indicated by the HARQ indication field.

[0202] The terminal device 1 may set the size of the HARQ-ACK codebook according to the size of the dl-DataToUL-ACK. For example, when the dl-DataToUL-ACK consists of eight elements, the size of the HARQ-ACK codebook is eight. For example, when the dl-DataToUL-ACK consists of two elements, the size of the HARQ-ACK codebook is two. Each HARQ-ACK information constituting the HARQ-ACK codebook is HARQ-ACK information for PDSCH reception at each slot timing of the dl-DataToUL-ACK. This type of HARQ-ACK codebook is also called a Semi-static HARQ-ACK codebook.

[0203] An example of the setting of the HARQ indication field will be described. For example, the dl-DataToUL-ACK is composed of a list of eight timings, 0, 7, 15, 23, 31, 39, 47, and 55, and the HARQ indication field is composed of three bits. The HARQ indication field of "000" corresponds to the first 0 in the list of dl-DataToUL-ACK as the corresponding timing. That is, the HARQ indication field of "000" corresponds to the value 0 indicated by the index 1 of the dl-DataToUL-ACK. The HARQ indication field of "001" corresponds to the second 7 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field of "010" corresponds to the third 15 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field of "011" corresponds to the fourth 23 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field "100" corresponds to the fifth 31 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field "101" corresponds to the sixth 39 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field "110" corresponds to the seventh 47 in the list of dl-DataToUL-ACK as the corresponding timing. The HARQ indication field "111" corresponds to the eighth 55 in the list of dl-DataToUL-ACK as the corresponding timing. If the received HARQ indication field indicates "000", the terminal device 1 transmits the corresponding HARQ-ACK in the 0th slot from the slots of the received PDSCH. If the received HARQ indication field indicates "001", the terminal device 1 transmits the corresponding HARQ-ACK in the seventh slot from the slots of the received PDSCH. If the received HARQ indication field indicates "010", the terminal device 1 transmits the corresponding HARQ-ACK in the 15th slot from the slots of the received PDSCH. If the received HARQ indication field indicates "011", the terminal device 1 transmits the corresponding HARQ-ACK in the 23rd slot from the slots of the received PDSCH.If the received HARQ indication field indicates "100", the terminal device 1 transmits the corresponding HARQ-ACK in the 31st slot from the slots of the received PDSCH. If the received HARQ indication field indicates "101", the terminal device 1 transmits the corresponding HARQ-ACK in the 39th slot from the slots of the received PDSCH. If the received HARQ indication field indicates "110", the terminal device 1 transmits the corresponding HARQ-ACK in the 47th slot from the slots of the received PDSCH. If the received HARQ indication field indicates "111", the terminal device 1 transmits the corresponding HARQ-ACK in the 55th slot from the slots of the received PDSCH.

[0204] When the upper layer parameter pdsch-AggregationFactor is given to the terminal device 1, N PDSCH repeat may be the value of pdsch-AggregationFactor. If the higher layer parameter pdsch-AggregationFactor is not provided to the terminal device 1, N PDSCH repeat may be 1. Terminal device 1 is in slot nN PDSCH repeat The HARQ-ACK information for PDSCH receptions from +1 to slot n may be reported using a PUCCH transmission and / or a PUSCH transmission in slot n+k, where k may be the number of slots indicated by the HARQ indication field included in the DCI format corresponding to the PDSCH reception, or k may be given by the higher layer parameter dl-DataToUL-ACK if the HARQ indication field is not included in the DCI format.

[0205] When the terminal device 1 is configured to monitor a PDCCH including DCI format 1_0 and is configured not to monitor a PDCCH including DCI format 1_1, the HARQ-ACK timing value K1 may be some 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 higher layer parameter dl-DataToUL-ACK.

[0206] The terminal device 1 determines a set of multiple opportunities for one or more candidate PDSCH receptions, which transmit corresponding HARQ-ACK information in the PUCCH of a certain slot. The terminal device 1 determines multiple slots of slot timing K1 included in dl-DataToUL-ACK as multiple opportunities for candidate PDSCH reception. K1 may be a set of k. For example, when dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), in the PUCCH of slot n, HARQ-ACK information for PDSCH reception of slot n-1, PDSCH reception of slot n-2, PDSCH reception of slot n-3, PDSCH reception of slot n-4, PDSCH reception of slot n-5, PDSCH reception of slot n-6, PDSCH reception of slot n-7, and PDSCH reception of slot n-8 is transmitted. When the terminal device 1 actually receives a PDSCH in a slot corresponding to the candidate PDSCH reception, it sets ACK or NACK as the HARQ-ACK information based on the transport block contained in the PDSCH, and when the terminal device 1 does not receive a PDSCH in the slot corresponding to the candidate PDSCH reception, it sets NACK as the HARQ-ACK information.

[0207] The HARQ indication field included in the DCI format received on the PDCCH in the n-1 slot indicates 1. The HARQ indication field included in the DCI format received on the PDCCH in the n-2 slot indicates 2. The HARQ indication field included in the DCI format received on the PDCCH in the n-3 slot indicates 3. The HARQ indication field included in the DCI format received on the PDCCH in the n-4 slot indicates 4. The HARQ indication field included in the DCI format received on the PDCCH in the n-5 slot indicates 5. The HARQ indication field included in the DCI format received on the PDCCH in the n-6 slot indicates 6. The HARQ indication field included in the DCI format received on the PDCCH in the n-7 slot indicates 7. The HARQ indication field included in the DCI format received on the PDCCH in the n-8 slot indicates 8.

[0208] The terminal device 1 determines a slot for transmitting HARQ-ACK information and a set of multiple candidate PDSCH reception slots corresponding to the HARQ-ACK information based on the slot in which the PDCCH was received and the value of the HARQ indication field included in the received DCI format. For example, when dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), the terminal device 1 receives the PDCCH in slot m, and the HARQ indication field included in the DCI format indicates 4. The terminal device 1 determines to transmit the HARQ-ACK information in slot (m+4). The terminal device 1 determines that the other HARQ-ACK information transmitted in slot (m+4) is HARQ-ACK information for PDSCH reception in slot (m+(1-4)), HARQ-ACK information for PDSCH reception in slot (m+(2-4)), HARQ-ACK information for PDSCH reception in slot (m+(3-4)), HARQ-ACK information for PDSCH reception in slot (m+(5-4)), HARQ-ACK information for PDSCH reception in slot (m+(6-4)), HARQ-ACK information for PDSCH reception in slot (m+(7-4)), and HARQ-ACK information for PDSCH reception in slot (m+(8-4)).

[0209] Although the semi-static HARQ-ACK codebook has been described above as a type of HARQ-ACK codebook, a different type of HARQ-ACK codebook may be used. A type of HARQ-ACK codebook called a dynamic HARQ-ACK codebook will be described.

[0210] The HARQ-ACK codebook corresponding to a certain PDSCH group is given based on one or more HARQ-ACK bits corresponding to any one or more transport blocks included in any one or more PDSCHs included in the certain PDSCH group. The HARQ-ACK codebook is given based on at least a set of monitoring occasions for PDCCH and some or all of the value of the counter DAI field. The HARQ-ACK codebook may be further given based on the value of the UL DAI field. The HARQ-ACK codebook may be further given based on the value of the DAI field. The HARQ-ACK codebook may be further given based on the value of the total DAI field.

[0211] The HARQ-ACK codebook size of the Dynamic HARQ-ACK codebook is based on a field of the DCI format. The size of the HARQ-ACK codebook may be set based on the value of the Counter DAI field of the last received DCI format. The Counter DAI field indicates the cumulative number of PDSCHs or transport blocks scheduled until reception of the corresponding DCI format. The size of the HARQ-ACK codebook may be set based on the value of the Total DAI field of the DCI format. The Total DAI field indicates the total number of PDSCHs or transport blocks scheduled until transmission of the HARQ-ACK codebook.

[0212] The terminal device 1 may determine a set of PDCCH monitoring occasions for HARQ-ACK information transmitted in a PUCCH arranged in a slot with index n (slot#n) based on at least a part or all of the value of the timing K1 and the value of the slot offset K0. The set of PDCCH monitoring occasions for HARQ-ACK information transmitted in a PUCCH arranged in a slot with index n is also referred to as a set of PDCCH monitoring occasions for slot n (monitoring occasion for PDCCH for slot#n). Here, the set of PDCCH monitoring occasions includes M PDCCH monitoring occasions. For example, the slot offset K0 may be indicated based at least on the value of a time domain resource allocation field included in a downlink DCI format. The slot offset K0 is a value indicating the number of slots (slot difference) from a slot including a last OFDM symbol in which a PDCCH including a DCI format including a time domain resource allocation field indicating the slot offset K0 is arranged to a first OFDM symbol of a PDSCH scheduled by the DCI format.

[0213] When a DCI format detected in a monitoring opportunity of any search space set corresponding to a monitoring opportunity of a certain PDCCH triggers (includes triggering information) to transmit HARQ-ACK information in slot n, the terminal device 1 may determine the monitoring opportunity of the PDCCH as a PDCCH monitoring opportunity for slot n. Also, when a DCI format detected in a monitoring opportunity of a search space set corresponding to a monitoring opportunity of a certain PDCCH does not trigger (does not include triggering information) to transmit HARQ-ACK information in slot n, the terminal device 1 may not determine the monitoring opportunity of the PDCCH as a PDCCH monitoring opportunity for slot n. Also, when a DCI format is not detected in a monitoring opportunity of a search space set corresponding to a monitoring opportunity of a certain PDCCH, the terminal device 1 may not determine the monitoring opportunity of the PDCCH as a PDCCH monitoring opportunity for slot n.

[0214] The PUCCH resource used for transmitting the HARQ-ACK information in slot n may be identified based at least on a PUCCH resource indication field included in a last DCI format among one or more DCI formats detected in a set of PDCCH monitoring opportunities for the slot n, where each of the one or more DCI formats triggers the transmission of the HARQ-ACK information in slot n. The last DCI format may be a DCI format corresponding to a last index (highest index) among the DCI formats detected in the set of PDCCH monitoring opportunities for the slot n. The indices of the DCI formats in the set of PDCCH monitoring opportunities for the slot n are given in ascending order with respect to the index of the serving cell in which the DCI format is detected, and then in ascending order with respect to the index of the PDCCH monitoring opportunity in which the DCI format is detected. The indices of the PDCCH monitoring opportunities are given in ascending order on the time axis.

[0215] A Counter DAI indicates, for a PDCCH monitoring opportunity in a serving cell, the cumulative number of PDCCHs detected up to a PDCCH monitoring opportunity in the serving cell (or may be a value at least related to the cumulative number) in M ​​PDCCH monitoring opportunities. The Counter DAI may also be referred to as a C-DAI. The C-DAI corresponding to a PDSCH may be indicated by a field included in a DCI format used for scheduling the PDSCH. The Total DAI may indicate the cumulative number of PDCCHs detected up to a PDCCH monitoring opportunity m in M ​​PDCCH monitoring opportunities (or may be a value at least related to the cumulative number). The Total DAI may be referred to as a T-DAI (Total Downlink Assignment Index).

[0216] The terminal device 1 monitors a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type downlink DCI format in an SCell, and starts monitoring the second type downlink DCI format when the first type downlink DCI format is detected. When the terminal device 1 does not detect the second type downlink DCI format for a certain period while monitoring the second type downlink DCI format, the terminal device 1 stops monitoring the second type downlink DCI format. The terminal device 1 determines to start monitoring the second type downlink DCI format based on the detection of the first type downlink DCI format.

[0217] The base station device 3 transmits, in the SCell, a first type downlink DCI format including scheduling information of the PDSCH of the SCell, or a second type downlink DCI format including both scheduling information of the PDSCH of the PCell and scheduling information of the PDSCH of the SCell, and the first type downlink DCI format, and starts transmitting the second type downlink DCI format when the first type downlink DCI format has been transmitted. When the base station device 3 has not transmitted the second type downlink DCI format for a certain period, the base station device 3 stops transmitting the second type downlink DCI format. The base station device 3 determines to start using the second type downlink DCI format for transmission based on the transmission of the first type downlink DCI format.

[0218] As described above, one aspect of the present invention can efficiently perform scheduling between the terminal device 1 and the base station device 3 while suppressing the processing load of the terminal device 1. In a situation where communication with the base station device 3 is not active, the terminal device 1 monitors only the first type of downlink DCI format in the SCell to suppress the processing load. In a situation where communication with the base station device 3 is active, the terminal device 1 monitors the second type of downlink DCI format in addition to the first type of downlink DCI format in the SCell to increase the scheduling capacity. In a situation where communication with the terminal device 1 is not active, the base station device 3 uses only the first type of downlink DCI format as a downlink DCI format that may be used for transmission in the SCell to suppress the processing load of the terminal device 1. In a situation where communication with the terminal device 1 is active, the base station device 3 uses the second type of downlink DCI format in addition to the first type of downlink DCI format as a downlink DCI format that may be used for transmission in the SCell to increase the scheduling capacity. By controlling the transmission and reception (monitoring) of the second type of downlink DCI format based on the transmission and reception of the first type of downlink DCI format, it is possible to avoid using dedicated signaling and to avoid deterioration in resource utilization efficiency.

[0219] The terminal device 1 may be switched between a state (first state) in which a first type of downlink DCI format is monitored by a first number of PDCCH candidates and a state (second state) in which the first type of downlink DCI format is monitored by a second number of PDCCH candidates while monitoring a second type of downlink DCI format by a third number of PDCCH candidates. When the terminal device 1 detects the first type of downlink DCI format in the first state, the terminal device 1 is switched to the second state. When the terminal device 1 does not detect the second type of downlink DCI format for a certain period in the second state, the terminal device 1 is switched to the first state.

[0220] The base station device 3 may be switched between a state (first state) in which the first type of downlink DCI format is transmitted to the terminal device 1 using any PDCCH candidate among the first number of PDCCH candidates, and a state (second state) in which the first type of downlink DCI format is transmitted to the terminal device 1 using any PDCCH candidate among the second number of PDCCH candidates and the second type of downlink DCI format is transmitted to the terminal device 1 using any PDCCH candidate among the third number of PDCCH candidates. When the base station device 3 transmits the first type of downlink DCI format to the terminal device 1 in the first state, the base station device 3 is switched to the second state. When the base station device 3 does not transmit the second type of downlink DCI format for a certain period in the second state, the base station device 3 is switched to the first state.

[0221] Various aspects of the device according to one aspect of this embodiment will now be described.

[0222] (1) In order to achieve the above object, one aspect of the present invention takes the following measures. That is, a first aspect of the present invention is a terminal device including a processor and a memory storing computer program code, which performs operations including: monitoring a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type downlink DCI format in an SCell; and starting monitoring the second type downlink DCI format when the first type downlink DCI format is detected.

[0223] (2) Furthermore, when the second type of downlink DCI format is not detected for a certain period of time while monitoring the second type of downlink DCI format, the monitoring of the second type of downlink DCI format is stopped.

[0224] (3) A second aspect of the present invention is a base station device comprising a processor and a memory for storing computer program code, the base station device performing operations including: transmitting a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type downlink DCI format in an SCell; and, when the first type downlink DCI format has been transmitted, starting to transmit the second type downlink DCI format.

[0225] (4) Furthermore, if the second type of downlink DCI format has not been transmitted for a certain period of time, transmission of the second type of downlink DCI format is stopped.

[0226] (5) A third aspect of the present invention is a communication method for use in a terminal device, comprising the steps of: monitoring a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type downlink DCI format in an SCell; and, when the first type downlink DCI format is detected, starting monitoring the second type downlink DCI format.

[0227] (6) Further, the method includes a step of stopping monitoring the second type downlink DCI format when the second type downlink DCI format is not detected for a certain period of time while monitoring the second type downlink DCI format.

[0228] (7) A fourth aspect of the present invention is a communication method for use in a base station device, comprising: transmitting, in an SCell, a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first downlink DCI format; and, when the first type downlink DCI format has been transmitted, starting to transmit the second type downlink DCI format.

[0229] (8) The method further includes a step of stopping transmission of the second type downlink DCI format when the second type downlink DCI format has not been transmitted for a certain period of time.

[0230] The base station device 3 and the terminal device 1 according to an aspect of the present invention may operate as a program (a program that makes a computer function) that controls a CPU (Central Processing Unit) or the like so as to realize the functions of the above-described embodiment according to an aspect of the present invention. Information handled by these devices is temporarily stored in a RAM (Random Access Memory) during processing, and is then stored in various ROMs such as a Flash ROM (Read Only Memory) or an HDD (Hard Disk Drive), and is read, modified, and written by the CPU as necessary.

[0231] In addition, a part of the terminal device 1 and the base station device 3 in the above-mentioned 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 the recording medium may be read into a computer system and executed to realize the control function.

[0232] The "computer system" here refers to a computer system built into the terminal device 1 or base station device 3, and includes hardware such as an OS and peripheral devices. Also, the "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into the computer system.

[0233] Furthermore, the term "computer-readable recording medium" may include a medium that dynamically stores a program for a short period of 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 a medium that stores a program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or client in such a case. The above program may be one that realizes part of the above-mentioned functions, or may be one that can realize the above-mentioned functions in combination with a program already recorded in the computer system.

[0234] The terminal device 1 may be configured to include at least one processor and at least one memory including computer program instructions (computer program). The memory and computer program instructions (computer program) may be configured to cause the terminal device 1 to perform the operations and processes described in the above embodiments using the processor. The base station device 3 may be configured to include at least one processor and at least one memory including computer program instructions (computer program). The memory and computer program instructions (computer program) may be configured to cause the base station device 3 to perform the operations and processes described in the above embodiments using the processor.

[0235] Furthermore, the base station device 3 in the above-described embodiment can also be realized as an aggregate (device group) consisting of a plurality of devices. Each of the devices constituting the device group may have some or all of the functions or functional blocks of the base station device 3 according to the above-described embodiment. It is sufficient for the device group to have all of the functions or functional blocks of the base station device 3. Furthermore, the terminal device 1 according to the above-described embodiment can also communicate with the base station device as an aggregate.

[0236] In addition, the base station device 3 in the above-mentioned embodiment may be an EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or an NG-RAN (NextGen RAN, NR RAN). In addition, the base station device 3 in the above-mentioned embodiment may have a part or all of the functions of an upper node for an eNodeB and / or a gNB.

[0237] In addition, some or all of the terminal device 1 and base station device 3 in the above-mentioned embodiment may be realized as an LSI, which is typically an integrated circuit, or may be realized as a chip set. Each functional block of the terminal device 1 and base station device 3 may be individually formed into a chip, or some or all of them may be integrated into a chip. The integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Furthermore, if an integrated circuit technology that replaces LSI appears due to advances in semiconductor technology, it is also possible to use an integrated circuit based on that technology.

[0238] In addition, in the above-described embodiment, a terminal device is described as an example of a communication device, but the present invention is not limited to this and can also be applied to terminal devices or communication devices such as stationary or non-movable electronic devices installed indoors or outdoors, for example, AV equipment, kitchen equipment, cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0239] Although the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes within the scope of the gist of the present invention are also included. In addition, one aspect of the present invention can be modified in various ways within the scope of 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. In addition, configurations in which elements described in each of the above embodiments are replaced with elements that have the same effect are also included. [Industrial Applicability]

[0240] One aspect of the present invention can be used in, for example, a communication system, a communication device (for example, a mobile phone device, a base station device, a wireless LAN device, or a sensor device), an integrated circuit (for example, a communication chip), or a program. [Explanation of symbols]

[0241] 1(1A, 1B, 1C) Terminal equipment 3 Base station equipment 10, 30 Radio transmitter / receiver 11, 31 Antenna section 12, 32 RF section 13, 33 Baseband section 14, 34 Upper layer processing unit 15, 35 Media access control layer processing unit 16, 36 Radio resource control layer processing unit

Claims

1. A terminal device comprising a processor and a memory for storing computer program code, the terminal device performing operations including: monitoring a first type of downlink DCI format in an SCell, which includes scheduling information of a PDSCH of an SCell, or a second type of downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type of downlink DCI format; and, when the first type of downlink DCI format is detected, starting monitoring the second type of downlink DCI format.

2. A terminal device as described in claim 1, which stops monitoring the second type of downlink DCI format if the second type of downlink DCI format is not detected for a certain period of time while monitoring the second type of downlink DCI format.

3. A base station device comprising a processor and a memory for storing computer program code, the base station device executing operations including: transmitting a first type of downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type of downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type of downlink DCI format in an SCell; and, when the first type of downlink DCI format has been transmitted, starting to transmit the second type of downlink DCI format.

4. The base station apparatus according to claim 3 , wherein the base station apparatus stops transmitting the second type of downlink DCI format if the second type of downlink DCI format has not been transmitted for a certain period of time.

5. A communication method for use in a terminal device, comprising: a step of monitoring a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type downlink DCI format in an SCell; and a step of starting monitoring the second type downlink DCI format when the first type downlink DCI format is detected.

6. The communication method of claim 5, further comprising: stopping monitoring the second type of downlink DCI format when the second type of downlink DCI format is not detected for a certain period of time while monitoring the second type of downlink DCI format.

7. A communication method used in a base station device, comprising: a step of transmitting, in an SCell, a first type downlink DCI format including scheduling information of a PDSCH of an SCell, or a second type downlink DCI format including both scheduling information of a PDSCH of a PCell and scheduling information of a PDSCH of an SCell, and the first type downlink DCI format; and a step of starting to transmit the second type downlink DCI format when the first type downlink DCI format has been transmitted.

8. The communication method according to claim 7 , further comprising: stopping transmission of the second type of downlink DCI format when the second type of downlink DCI format has not been transmitted for a certain period of time.

Images