Terminal equipment, base station equipment, and communication method

Abstract

According to the present invention, a first search area and a second search area are configured on the basis of RRC signaling, PDCCH is monitored in the second search area, a first control signal multiplexed with PDSCH of which resource allocation is shown in the DCI format and which is included in PDCCH received in the second search area is received, and when the first control signal includes information indicating that PDCCH monitoring is performed in the first search area, the PDCCH is monitored in the first search area.

Description

[Technical Field]

[0001] The present invention relates to a terminal device, a base station device, and a communication method. This application claims priority with respect to Japanese Patent Application No. 2021-50880, filed in Japan on March 25, 2021, and the contents of that application are incorporated herein by reference. [Background technology]

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

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

[0004] Furthermore, support for noise reduction (NR) in the frequency band from 52.6 GHz to 71 GHz is being considered (Non-Patent Literature 1). In addition to the 120 kHz subcarrier spacing, the introduction of 480 kHz and 960 kHz subcarrier spacings is being considered. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Revised WID: Extending current NR operation to 71GHz", RP-202925, CMCC 3GPP TSG RAN Meeting #90-e, Electronic Meeting, 7-11 December, 2020. [Overview of the project] [Problems that the invention aims to solve]

[0006] As subcarrier spacing increases, the length of a single slot decreases, increasing the processing load within a single slot. Therefore, improvements in PDCCH (Physical Downlink Control Channel) monitoring are required. Multi-slot scheduling, which allocates resources for multiple slots' PDSCHs and PUSCHs using a single PDCCH, is being considered, while monitoring such PDCCHs not on a slot-by-slot basis but on a group-by-group basis. One aspect of the present invention provides a terminal device, a base station device, a communication method used in the terminal device, and a communication method used in the base station device for efficient communication. [Means for solving the problem]

[0007] (1) To achieve the above objective, one aspect of the present invention employs the following means. That is, a first aspect of the present invention is a terminal device comprising a processor and a memory for storing computer program code, which performs an operation including receiving RRC signaling indicating the configuration of a first search area and a second search area, in which the search area configuration includes at least the number of PDCCH candidates for each period, offset, and aggregation level; configuring the first search area and the second search area based on the RRC signaling; monitoring the PDCCH in the second search area; receiving a first control signal multiplexed with a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH received in the second search area; and monitoring the PDCCH in the first search area if the first control signal includes information instructing the monitoring of the PDCCH in the first search area.

[0008] (2) A second aspect of the present invention is a base station device comprising a processor and a memory for storing computer program code, which performs an operation comprising: configuring a first search area and a second search area; transmitting RRC signaling indicating the configuration of the first search area and the second search area, wherein the configuration of the search area includes at least the number of PDCCH candidates for each period, offset, and aggregation level; transmitting a PDCCH in the second search area; transmitting a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH, and a first control signal multiplexed with the PDSCH; and transmitting a PDCCH in the first search area if the first control signal includes information instructing the monitoring of the PDCCH in the first search area.

[0009] (3) A third aspect of the present invention is a communication method used in a terminal device, comprising the steps of: receiving RRC signaling indicating the configuration of a first search area and a second search area, the configuration of a search area including at least the number of PDCCH candidates for each period, offset, and aggregation level; configuring the first search area and the second search area based on the RRC signaling; monitoring a PDCCH in the second search area; receiving a first control signal multiplexed with a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH received in the second search area; and, if the first control signal includes information instructing that PDCCH be monitored in the first search area, monitoring a PDCCH in the first search area.

[0010] (4) A fourth aspect of the present invention is a communication method used in a base station device, comprising the steps of: configuring a first search area and a second search area; transmitting an RRC signaling indicating the configuration of the first search area and the second search area, which includes at least the number of PDCCH candidates for each period, offset, and aggregation level; transmitting a PDCCH in the second search area; transmitting a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH; and a first control signal multiplexed with the PDSCH; and transmitting a PDCCH in the first search area if the first control signal includes information instructing that PDCCH monitoring be performed in the first search area. [Effects of the Invention]

[0011] According to one aspect of this invention, efficient communication between a terminal device and a base station device can be achieved while reducing the processing load on the terminal device. [Brief explanation of the drawing]

[0012] [Figure 1] This is a conceptual diagram of a wireless communication system according to one aspect of this embodiment. [Figure 2]This is an example illustrating the relationship between Nslot symb, subcarrier spacing μ, slot setting, and CP setting according to one aspect of this embodiment. [Figure 3] This is an example showing the configuration of a wireless frame, subframe, and slot according to one aspect of this embodiment. [Figure 4] This is a schematic diagram showing an example of a resource grid in a subframe according to one aspect of this embodiment. [Figure 5] This is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of this embodiment. [Figure 6] This is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. [Figure 7] This figure shows an example of PDCCH monitoring based on a first control signal according to one embodiment of this model. [Modes for carrying out the invention]

[0013] Embodiments of the present invention will be described below.

[0014] "A, and / or B" may be a term that includes "A", "B", or "A and B".

[0015] A parameter or piece of information may have one or more values, meaning that the parameter or information may include at least one parameter or piece of information that has those one or more values. A top-level parameter may be a single top-level parameter. A top-level parameter may be an information element (IE) that contains multiple parameters.

[0016] Figure 1 is a conceptual diagram of a wireless communication system according to one aspect of this embodiment. In Figure 1, the wireless communication system comprises terminal devices 1A to 1C and base station devices 3A to 3B. Hereinafter, terminal devices 1A to 1C will also be referred to as terminal device 1 (UE). Hereinafter, base station devices 3A to 3B will also be referred to as base station device 3 (gNB or eNB).

[0017] 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). An MCG is a group of serving cells comprising at least a PCell (Primary Cell). An SCG is a group of serving cells comprising at least a PSCell (Primary Secondary Cell). A PCell may be a serving cell given based on the initial connection. An MCG may be configured to include one or more SCells (Secondary Cells). An SCG may be configured to include one or more SCells. A serving cell identity is a short identifier for identifying a serving cell. A serving cell identity may be given by a higher-layer parameter.

[0018] For example, base station equipment 3A and base station equipment 3B communicate with terminal equipment 1 using the same frequency (carrier). For example, base station equipment 3A and base station equipment 3B communicate with terminal equipment 1 using different frequencies (carriers). For example, base station equipment 3A communicates with terminal equipment 1 using the same frequency (carrier) as base station equipment 3B and different frequencies (carriers). For example, a frequency band requiring a license is used. For example, a frequency band that does not require a license is used.

[0019] The following explains the frame structure.

[0020] In a wireless communication system according to one aspect of this 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 more subcarriers. An OFDM symbol may be converted into a time-continuous signal in baseband signal generation.

[0021] Subcarrier spacing (SCS: SubCarrier Spacing) may be given as subcarrier spacing Δf=2 μ ·15 kHz. For example, the subcarrier spacing configuration μ may be set to any one of 0, 1, 2, 3, 4, 5, and 6. For example, the subcarrier spacing may be any one of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, and 960 kHz. For a given BWP (BandWidth Part), the subcarrier spacing configuration μ may be provided by a higher layer parameter.

[0022] In the wireless communication system according to one aspect of the present embodiment, a time unit T for expressing a length in the time domain c is used. The time unit T c is T c = 1 / (Δf max ·N f ) may be used. Δf max may be the maximum value of subcarrier spacing supported in the wireless communication system according to one aspect of the present embodiment. Δf max may be Δf max = 480 kHz. N f may be N f = 4096. The constant κ is κ=Δf max ·N f / (Δf ref N f,ref ) = 64. Δf ref may be 15 kHz. N f,ref may be 2048.

[0023] The constant κ may be a value indicating a relationship between a reference subcarrier spacing and T c The constant κ may be used for the length of a subframe. Based at least on the constant κ, the number of slots included in a subframe may be determined. Δf ref is the reference subcarrier spacing, and N f,refThis value corresponds to the reference subcarrier interval.

[0024] Downlink transmissions, and / or uplink transmissions, consist of 10ms frames. Each frame contains 10 subframes, each with a length of 1ms. The frame length may be given regardless of the subcarrier spacing Δf; that is, the frame configuration may be given regardless of μ. The subframe length may be given regardless of the subcarrier spacing Δf; that is, the subframe configuration may be given regardless of μ.

[0025] For a setting μ of a subcarrier interval, the number and index of slots included in the subframe may be given. For example, the first slot number n μ s Within the subframe, the range is from 0 to N subframe,μ slot The subcarrier interval μ may be given in ascending order within the range of -1. The number of slots and their indices in the frame may be given for setting the subcarrier interval μ. For example, the second slot number n μ s,f Within a frame, the range is from 0 to N frame,μ slot The values ​​may be given in ascending order within the range of -1. Consecutive N slot symb Each OFDM symbol may be contained within a single slot. slot symb The slot configuration and / or Cyclic Prefix (CP) configuration may be provided based on at least some or all of the slot configuration and / or the Cyclic Prefix (CP) configuration. The slot configuration may be provided by at least the higher-level parameter tdd-UL-DL-ConfigurationCommon. The CP configuration may be provided based on at least the higher-level parameters. The CP configuration may be provided based on at least dedicated RRC signaling. The first slot number and the second slot number are also referred to as slot numbers (slot indices).

[0026] Figure 2 shows an N according to one aspect of this embodiment. slot symb This is an example showing the relationship between the subcarrier spacing setting μ, slot setting, and CP setting. In Figure 2A, when the slot setting is 0, the subcarrier spacing setting μ is 2, and the CP setting is normal CP (normal cyclic prefix), N slot symb =14, N frame,μ slot =40, N subframe,μ slot = 4. Also, in Figure 2B, when the slot setting is 0, the subcarrier spacing setting μ is 2, and the CP setting is extended CP (extended cyclic prefix), N slot symb =12, N frame,μ slot =40, N subframe,μ slot =4. N in slot setting 0 slot symb This is N in slot setting 1. slot symb It may also correspond to twice that amount.

[0027] In terminal device 1, common subcarrier spacing, slot settings, and CP settings may be performed for each cell, or different subcarrier spacing, slot settings, and CP settings may be performed for each cell. In base station device 3A and base station device 3B, common subcarrier spacing, slot settings, and CP settings may be performed, or different subcarrier spacing, slot settings, and CP settings may be performed.

[0028] Figure 3 shows an example of the configuration of a wireless frame, subframe, and slot according to one aspect of this embodiment. In the example shown in Figure 3, the slot length is 0.5 ms, the subframe length is 1 ms, and the wireless frame length is 10 ms. A slot may be a unit of resource allocation in the time domain. For example, a slot may be a unit to which one transport block is mapped. For example, a transport block may be mapped to one slot. Here, a transport block may be a unit of data transmitted within a predetermined interval (e.g., Transmission Time Interval (TTI)) defined by a higher layer (e.g., MAC: Media Access Control, RRC: Radio Resource Control).

[0029] For example, the slot length may be given by the number of OFDM symbols. For example, the number of OFDM symbols may be 7 or 14. The slot length may be given based on at least the length of the OFDM symbols. The length of the OFDM symbols may differ at least based on the subcarrier spacing. The length of the OFDM symbols may also be given at least based on the number of points in the Fast Fourier Transform (FFT) used to generate the OFDM symbols. The length of the OFDM symbols may also include the length of the cyclic prefix (CP) added to the OFDM symbols. Here, OFDM symbols may also be referred to as symbols. Furthermore, when a communication method other than OFDM is used in communication between terminal device 1 and base station device 3 (for example, when SC-FDMA or DFT-s-OFDM is used), the generated SC-FDMA symbols and / or DFT-s-OFDM symbols are also referred to as OFDM symbols. Furthermore, unless otherwise specified, OFDM includes SC-FDMA or DFT-s-OFDM.

[0030] For example, the slot length may be 0.0078125ms, 0.03125ms, 0.125ms, 0.25ms, 0.5ms, or 1ms. For example, if the subcarrier interval is 15kHz, the slot length may be 1ms. For example, if the subcarrier interval is 30kHz, the slot length may be 0.5ms. For example, if the subcarrier interval is 120kHz, the slot length may be 0.125ms. For example, if the subcarrier interval is 480kHz, the slot length may be 0.03125ms. For example, if the subcarrier interval is 960kHz, the slot length may be 0.0078125ms. For example, if the slot length is 0.0078125ms, one subframe may consist of 128 slots. For example, if the slot length is 0.03125ms, one subframe may consist of 32 slots. For example, if the slot length is 0.125ms, one subframe may consist of 8 slots. For example, if the slot length is 0.25 ms, one subframe may consist of four slots. For example, if the slot length is 0.5 ms, one subframe may consist of two slots. For example, if the slot length is 1 ms, one subframe may consist of one slot.

[0031] Here, OFDM includes multicarrier communication schemes to which pulse shaping, PAPR reduction, out-of-band radiation reduction, or filtering and / or phase processing (e.g., phase rotation) is applied. A multicarrier communication scheme may also be a communication scheme that generates / transmits a signal in which multiple subcarriers are multiplexed.

[0032] A wireless frame may be given by the number of subframes. The number of subframes for a wireless frame may be, for example, 10. A wireless frame may also be given by the number of slots.

[0033] In terminal device 1, a common wireless frame configuration, subframe configuration, and slot configuration may be set for each cell, or different wireless frame configurations, subframe configurations, and slot configurations may be set for each cell. In base station devices 3A and 3B, a common wireless frame configuration, subframe configuration, and slot configuration may be set, or different wireless frame configurations, subframe configurations, and slot configurations may be set.

[0034] The following is a description of physical resources.

[0035] An antenna port is defined by the fact that the channels through which symbols are transmitted in one antenna port can be estimated from the channels through which other symbols are transmitted in the same antenna port. Two antenna ports are referred to as QCL (Quasi Co-Located) if the large-scale properties of the channels through which symbols are transmitted in one antenna port can be estimated from the channels through which symbols are transmitted in another antenna port. The large-scale properties may include at least the long-range properties of the channels. The large-scale properties may include at least some or all of the delay spread, Doppler spread, Doppler shift, average gain, average delay, and some of the spatial Rx parameters. A first antenna port and a second antenna port are QCL with respect to beam parameters if the received beam assumed by the receiver for the first antenna port is the same as the received beam assumed by the receiver for the second antenna port. For the first and second antenna ports to be QCL with respect to beam parameters, it is also possible that the transmission beam assumed by the receiver for the first antenna port and the transmission beam assumed by the receiver for the second antenna port are identical. Terminal device 1 may assume that the two antenna ports are QCL if the large-scale characteristics of the channel through which symbols are transmitted at one antenna port can be estimated from the channel through which symbols are transmitted at the other antenna port. For the two antenna ports to be QCL, it is also possible that it is assumed that the two antenna ports are QCL.

[0036] For setting the subcarrier interval and setting the carriers, N μ RB,x N RB sc Individual subcarriers and N (μ) symb N subframe,μsymb A resource grid of N OFDM symbols is given. μ RB,x This may represent the number of resource blocks given for setting the subcarrier interval μ for carrier x. μ RB,x This may be the maximum number of resource blocks given for setting the subcarrier interval μ for carrier x. Carrier x indicates either a downlink carrier or an uplink carrier; that is, x is either "DL" or "UL". μ RB is, N μ RB,DL , and / or, N μ RB,UL This is a designation that includes N. RB sc This may indicate the number of subcarriers contained in a single resource block. At least one resource grid may be provided for each antenna port p, and / or for each subcarrier spacing setting μ, and / or for each transmission direction setting. The transmission direction includes at least the downlink (DL) and uplink (UL). Hereinafter, a set of parameters including at least some or all of the antenna port p, subcarrier spacing setting μ, and transmission direction setting will also be referred to as the first radio parameter set. In other words, one resource grid may be provided for each first radio parameter set.

[0037] In a downlink, the carriers contained within the serving cell are called downlink carriers (or downlink component carriers). In an uplink, the carriers contained within the serving cell are called uplink carriers (uplink component carriers). Downlink component carriers and uplink component carriers are collectively referred to as component carriers (or carriers).

[0038] Each element in a resource grid provided for each first radio parameter set is referred to as a resource element. A resource element is identified by a frequency domain index k sc and a time domain index l sym . For a certain first radio parameter set, a resource element is identified by a frequency domain index k sc and a time domain index l sym . A resource element identified by a frequency domain index k sc and a time domain index l sym is also referred to as resource element (k sc , l sym ). The frequency domain index k sc indicates any value from 0 to N μ RB N RB sc -1. N μ RB may be the number of resource blocks provided for subcarrier spacing configuration μ. N RB sc is the number of subcarriers included in a resource block, and N RB sc =12. The frequency domain index k sc may correspond to a subcarrier index k sc . The time domain index l sym may correspond to an OFDM symbol index l sym .

[0039] FIG. 4 is a schematic diagram showing an example of a resource grid in a subframe according to one aspect of the present embodiment. In the resource grid of FIG. 4, the horizontal axis is the time domain index l sym and the vertical axis is the frequency domain index k sc . In one subframe, the frequency domain of the resource grid is N μ RB N RB scIt contains subcarriers. In one subframe, the time domain of the resource grid is 14.2 μ It may contain OFDM symbols. One resource block may contain N RB sc It consists of including several subcarriers. The time domain of a resource block may correspond to 1 OFDM symbol. The time domain of a resource block may correspond to 14 OFDM symbols. The time domain of a resource block may correspond to 1 or more slots. The time domain of a resource block may correspond to 1 subframe.

[0040] Figure 4 shows an example of a resource grid in a single cell.

[0041] Terminal device 1 may be instructed to transmit and receive using only a subset of the resource grid. A subset of the resource grid is also called a BWP, and a BWP may be given based on at least some or all of the higher-layer parameters and / or DCI. A BWP is also called a Bandwidth Part (BP). In other words, terminal device 1 is not instructed to transmit and receive using the entire set of the resource grid. In other words, terminal device 1 may be instructed to transmit and receive using only some of the frequency resources in the resource grid. A single BWP may consist of multiple resource blocks in the frequency domain. A single BWP may consist of multiple consecutive resource blocks in the frequency domain. A BWP set for a downlink carrier is also called a downlink BWP. A BWP set for an uplink carrier is also called an uplink BWP.

[0042] One or more downlink BWPs may be configured for terminal device 1. Terminal device 1 may attempt to receive a physical channel (e.g., PDCCH, PDSCH, SS / PBCH, etc.) on one of the downlink BWPs. This one downlink BWP is also referred to as the activated downlink BWP.

[0043] One or more uplink BWPs may be configured for terminal device 1. Terminal device 1 may attempt to transmit a physical channel (e.g., PUCCH, PUSCH, PRACH, etc.) on one of the uplink BWPs. This one uplink BWP is also referred to as the activated uplink BWP.

[0044] A set of downlink BWPs may be configured for each serving cell. The set of downlink BWPs may contain one or more downlink BWPs. A set of uplink BWPs may be configured for each serving cell. The set of uplink BWPs may contain one or more uplink BWPs.

[0045] Upper layer parameters are parameters included in the upper layer signal. The upper layer signal may be RRC (Radio Resource Control) signaling or MAC CE (Medium Access Control Control Element). Here, the upper layer signal may be the RRC layer signal or the MAC layer signal.

[0046] The upper layer signals may be common RRC signaling. Common RRC signaling may include at least some or all of the following features C1 to C3. Feature C1) Maps to BCCH logical channels or CCCH logical channels Feature C2) radioResourceConfigCommon information element is included in at least Feature C3) Mapped to PBCH

[0047] The radioResourceConfigCommon information element may include information indicating settings commonly used in the serving cell. These commonly used settings may include at least a PRACH setting. The PRACH setting may indicate at least one or more random access preamble indices. The PRACH setting may also indicate at least a PRACH time / frequency resource.

[0048] The upper layer signals may be dedicated RRC signaling. Dedicated RRC signaling may have at least some or all of the following features D1 to D2. Feature D1) Mapped to DCCH logical channel Feature D2) Includes at least one radioResourceConfigDedicated information element

[0049] The radioResourceConfigDedicated information element may include at least information indicating settings specific to terminal device 1. The radioResourceConfigDedicated information element may include at least information indicating BWP settings. The BWP settings may at least indicate the frequency resources of the BWP.

[0050] For example, MIB, first system information, and second system information may be included in the common RRC signaling. Also, upper-layer messages that are mapped to a DCCH logical channel and include at least radioResourceConfigCommon may be included in the common RRC signaling. Also, upper-layer messages that are mapped to a DCCH logical channel and do not include the radioResourceConfigCommon information element may be included in the dedicated RRC signaling. Also, upper-layer messages that are mapped to a DCCH logical channel and include at least the radioResourceConfigDedicated information element may be included in the dedicated RRC signaling.

[0051] The first system information may include at least the time index of the SS (Synchronization Signal) block. The SS block is also referred to as the SS / PBCH block. The SS / PBCH block is also referred to as the SS / PBCH. The first system information may include at least information related to the PRACH resource. The first system information may include at least information related to the initial connection settings. The second system information may be system information other than the first system information.

[0052] The radioResourceConfigDedicated information element may include at least information related to the PRACH resource. The radioResourceConfigDedicated information element may also include at least information related to the initial connection settings.

[0053] The following describes various aspects of this embodiment of physical channels and physical signals.

[0054] An uplink physical channel may correspond to a set of resource elements that carry information generated in the upper layer. An uplink physical channel is a physical channel used in the uplink carrier. In a wireless communication system according to one aspect of this 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)

[0055] PUCCH may be used to transmit Uplink Control Information (UCI). Uplink Control Information includes some or all of the HARQ-ACK (Hybrid Automatic Repeat Request ACKnowledgement) corresponding to Channel State Information (CSI), Scheduling Request (SR), Transport block (TB), MAC PDU (Medium Access Control Protocol Data Unit), DL-SCH (Downlink-Shared Channel), and PDSCH (Physical Downlink Shared Channel). Note that Uplink Control Information may also include information not listed above.

[0056] HARQ-ACK may include at least HARQ-ACK bits (HARQ-ACK information) corresponding to at least one transport block. HARQ-ACK bits may indicate an ACK (acknowledgement) or NACK (negative-acknowledgement) corresponding to one or more transport blocks. HARQ-ACK may include at least a HARQ-ACK codebook containing one or more HARQ-ACK bits. HARQ-ACK bits corresponding to one or more transport blocks may correspond to a PDSCH containing said one or more transport blocks. HARQ-ACK bits may indicate an ACK or NACK corresponding to one CBG (Code Block Group) contained in a transport block.

[0057] A scheduling request (SR) may be used to request PUSCH resources for initial transmission. The scheduling request bit may be used to indicate either a positive SR or a negative SR. When the scheduling request bit indicates a positive SR, it is also referred to as "a positive SR is sent." A positive SR may indicate that terminal device 1 is requesting PUSCH resources for initial transmission. A positive SR may indicate that the scheduling request is triggered by a higher layer. A positive SR may be sent when the higher layer instructs that a scheduling request be sent. When the scheduling request bit indicates a negative SR, it is also referred to as "a negative SR is sent." A negative SR may indicate that terminal device 1 is not requesting PUSCH resources for initial transmission. A negative SR may indicate that the scheduling request is not triggered by a higher layer. A negative SR may be sent when the higher layer does not instruct that a scheduling request be sent.

[0058] Channel status information may include at least some or all of the following: Channel Quality Indicator (CQI), Precoder Matrix Indicator (PMI), and Rank Indicator (RI). CQI is an indicator related to channel quality (e.g., propagation strength), PMI is an indicator of the precoder, and RI is an indicator of the transmit rank (or transmit layer number).

[0059] PUCCH may support one or more PUCCH formats (for example, PUCCH format 0 to PUCCH format 4). A PUCCH format may be mapped to a PUCCH and sent. A PUCCH format may be sent as a PUCCH. Sending a PUCCH format may be equivalent to sending a PUCCH.

[0060] PUSCH is used to transmit transport blocks (TB, MAC PDU, UL-SCH, PUSCH). PUSCH may be used to transmit at least some or all of the transport blocks, HARQ-ACK, channel status information, and scheduling requests. PUSCH is used to transmit random access messages 3. PUSCH may be used to transmit information not described above.

[0061] PRACH is used at least to send a random access preamble (random access message 1). PRACH may also be used at least to indicate some or all of the initial connection establishment procedure, handover procedure, connection re-establishment procedure, synchronization (timing adjustment) for sending PUSCH, and resource requests for PUSCH. The random access preamble may also be used to notify the base station device 3 of an index (random access preamble index) provided by the upper layer of terminal device 1.

[0062] In Figure 1, the following uplink physical signals are used in uplink wireless communication. Uplink physical signals do not necessarily have to be used to transmit information output from higher layers, but they are used by the physical layer. ·UL DMRS(UpLink Demodulation Reference Signal) ·SRS(Sounding Reference Signal) ·UL PTRS(UpLink Phase Tracking Reference Signal)

[0063] UL DMRS is associated with the transmission of PUSCH and / or PUCCH. UL DMRS is multiplexed with PUSCH or PUCCH. Base station equipment 3 may use UL DMRS to perform propagation path correction for PUSCH or PUCCH. Hereinafter, transmitting PUSCH and the UL DMRS associated with it will be simply referred to as "transmitting PUSCH." Hereinafter, transmitting PUCCH and the UL DMRS associated with it will be simply referred to as "transmitting PUCCH." UL DMRS associated with PUSCH is also referred to as UL DMRS for PUSCH. UL DMRS associated with PUCCH is also referred to as UL DMRS for PUCCH.

[0064] SRS may not be associated with the transmission of PUSCH or PUCCH. Base station equipment 3 may use SRS to measure channel status. SRS may be transmitted at the end of a subframe in an uplink slot, or in a predetermined number of OFDM symbols from the end.

[0065] UL PTRS may be a reference signal used for phase tracking. UL PTRS may be associated with a UL DMRS group that includes at least one antenna port used for one or more UL DMRSs. The association between UL PTRS and a UL DMRS group may mean that some or all of the antenna ports of the UL PTRS and some of the antenna ports included in the UL DMRS group are QCLs. UL DMRS groups may be identified based at least on the antenna port with the smallest index among the UL DMRS included in the UL DMRS group. UL PTRS may be mapped to the antenna port with the smallest index among one or more antenna ports to which a codeword is mapped. UL PTRS may be mapped to the first layer if a codeword is mapped to at least the first and second layers. UL PTRS may not be mapped to the second layer. The index of the antenna port to which UL PTRS is mapped may be given based at least on downlink control information.

[0066] Furthermore, uplink physical signals not described above may also be used.

[0067] In Figure 1, the following downlink physical channels are used in the downlink wireless communication from base station device 3 to terminal device 1. The downlink physical channels are used by the physical layer to transmit information output from the higher layers. ·PBCH(Physical Broadcast Channel) ·PDCCH (Physical Downlink Control Channel) ·PDSCH(Physical Downlink Shared Channel)

[0068] A PBCH is used to transmit a Master Information Block (MIB, BCH, Broadcast Channel). A PBCH may be transmitted based on a predetermined transmission interval. A PBCH may be transmitted at 80ms intervals. A PBCH may be transmitted at 160ms intervals. The contents of the information contained in the PBCH may be updated every 80ms. Some or all of the information contained in the PBCH may be updated every 160ms. A PBCH may consist of 288 subcarriers. A PBCH may consist of 2, 3, or 4 OFDM symbols. The MIB may contain information related to the identifier (index) of the synchronization signal. The MIB may contain information indicating the slot number, subframe number, and / or at least part of the radio frame number to which the PBCH is transmitted.

[0069] PDCCH is used at least for transmitting Downlink Control Information (DCI). PDCCH may transmit with at least Downlink Control Information. PDCCH may include Downlink Control Information. Downlink Control Information is also called DCI format. Downlink Control Information may include at least either a Downlink Grant (DL grant) or an Uplink Grant (UL grant). The DCI format used for scheduling PDSCH is also called the Downlink DCI format. The DCI format used for scheduling PUSCH is also called the Uplink DCI format. Downlink Grant is also called Downlink Assignment (DL assignment) or Downlink Allocation (DL allocation). The Uplink DCI format includes at least one or both of DCI format 0_0 and DCI format 0_1.

[0070] DCI format 0_0 consists of at least some or all of 1A through 1F. 1A) DCI format specific field (Identifier for DCI formats field) 1B) Frequency domain resource assignment field 1C) Time domain resource assignment field 1D) Frequency hopping flag field 1E) MCS field (Modulation and Coding Scheme field) 1F) CSI Request Field

[0071] A DCI format-specific field may be used to indicate which of one or more DCI formats a DCI format containing the DCI format-specific field corresponds to. The one or more DCI formats may be given based on at least some or all of DCI format 1_0, DCI format 1_1, DCI format 0_0, and / or DCI format 0_1.

[0072] The frequency domain resource allocation field may be used to indicate the allocation of frequency resources for PUSCH, which is scheduled using a DCI format that includes the frequency domain resource allocation field. The frequency domain resource allocation field is also referred to as the FDRA (Frequency Domain Resource Allocation) field.

[0073] A time domain resource allocation field may be used to indicate the allocation of time resources for a PUSCH scheduled in a DCI format that includes the time domain resource allocation field.

[0074] A frequency hopping flag field may be used to indicate whether or not frequency hopping is applied to a PUSCH scheduled using a DCI format that includes the frequency hopping flag field.

[0075] The MCS field may be used to indicate at least part or all of the modulation scheme and / or target coding rate for a PUSCH scheduled by a DCI format including the MCS field. The target coding rate may be the target coding rate for the transport block of the PUSCH. The transport block size (TBS) may be given at least based on the target coding rate.

[0076] The CSI request field is used at least to direct the reporting of the CSI. The size of the CSI request field may be a predetermined value. The size of the CSI request field may be 0, 1, 2, or 3.

[0077] DCI format 0_1 ​​consists of at least some or all of 2A through 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)

[0078] The UL DAI field is used to indicate the transmission status of the PDSCH. If 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 by the PUSCH. The UL DAI field indicates the number of HARQ-ACKs included in the HARQ-ACK codebook transmitted by the PUSCH. The UL DAI field indicates the number of PDSCHs in which the corresponding HARQ-ACKs are included in the HARQ-ACK codebook transmitted by the PUSCH. The UL DAI field indicates the number of PDSCHs and SPS releases in which the corresponding HARQ-ACKs are included in the HARQ-ACK codebook transmitted by the PUSCH.

[0079] The UL DAI field may indicate the value after applying modulo arithmetic. An example of a 2-bit UL DAI field is described below. If the HARQ-ACK codebook sent via PUSCH contains 0 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be "00". If the HARQ-ACK codebook sent via PUSCH contains 1 PDSCH with corresponding HARQ-ACKs, the UL DAI field will be "01". If the HARQ-ACK codebook sent via PUSCH contains 2 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be "10". If the HARQ-ACK codebook sent via PUSCH contains 3 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be "11". If the HARQ-ACK codebook sent via PUSCH contains 4 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be set to "00". If the HARQ-ACK codebook sent via PUSCH contains 5 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be set to "01". If the HARQ-ACK codebook sent via PUSCH contains 6 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be set to "10". If the HARQ-ACK codebook sent via PUSCH contains 7 PDSCHs with corresponding HARQ-ACKs, the UL DAI field will be set to "11". In this example, a modulo operation using the number '4' is performed on the number of PDSCHs that contain corresponding HARQ-ACKs in the HARQ-ACK codebook sent via PUSCH.

[0080] Terminal device 1 interprets the UL DAI field considering the total number of PDSCHs received. For example, if terminal device 1 receives 4 PDSCHs and receives a UL DAI field indicating "00", terminal device 1 interprets that there are 4 PDSCHs whose HARQ-ACKs are included in the HARQ-ACK codebook transmitted via PUSCH, as indicated by the UL DAI field. For example, if terminal device 1 receives 3 PDSCHs and receives a UL DAI field indicating "00", terminal device 1 interprets that there are 4 PDSCHs whose HARQ-ACKs are included in the HARQ-ACK codebook transmitted via PUSCH, as indicated by the UL DAI field, and determines that it missed receiving one PDSCH.

[0081] The BWP field may be used to indicate the uplink BWP to which a PUSCH scheduled according to DCI format 0_1 ​​is mapped.

[0082] The CSI request field is used at least to instruct the reporting of a CSI. The size of the CSI request field may be given at least based on the higher-level parameter ReportTriggerSize.

[0083] The downlink DCI format includes at least one or both of DCI format 1_0 and DCI format 1_1.

[0084] DCI format 1_0 consists of at least some or all of 3A through 3H. 3A) DCI format specific field (Identifier for DCI formats field) 3B) Frequency domain resource assignment field 3C) Time domain resource assignment field 3D) Frequency hopping flag field; 3E) MCS field (Modulation and Coding Scheme field) 3F) First CSI request field 3G) PDSCH-to-HARQ Feedback Timing Indicator Field 3H) PUCCH resource indicator field

[0085] The timing instruction field from the PDSCH to the HARQ feedback may be a field indicating timing K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the PUCCH or PUSCH containing at least the HARQ-ACK corresponding to the transport block contained in the PDSCH may be n+K1. If the index of the slot containing the last OFDM symbol of the PDSCH is slot n, the index of the slot containing the first OFDM symbol of the PUCCH or the first OFDM symbol of the PUSCH containing at least the HARQ-ACK corresponding to the transport block contained in the PDSCH may be n+K1.

[0086] Hereinafter, the PDSCH-to-HARQ feedback timing indicator field may also be referred to as the HARQ indicator field.

[0087] The PUCCH resource reference field may be a field that indicates the index of one or more PUCCH resources included in the PUCCH resource set.

[0088] DCI format 1_1 consists of at least some or all of 4A through 4J. 4A) DCI format specific field (Identifier for DCI formats field) 4B) Frequency domain resource assignment field 4C) Time domain resource assignment field 4D) Frequency hopping flag field 4E) MCS field (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

[0089] The BWP field may be used to indicate the downlink BWP to which the PDSCH scheduled according to DCI format 1_1 is mapped.

[0090] DCI format 2_0 may consist of at least one or more slot format indicators (SFIs).

[0091] Downlink control information may include a Slot Format Indicator (SFI). Patterns indicating whether each subframe (slot) in a group 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. Terminal device 1 may determine that a subframe (slot) not indicated by the received SFI is a flexible subframe (slot). If a PUSCH transmission is scheduled for a flexible subframe (slot) via UL grant, terminal device 1 processes the flexible subframe (slot) as an uplink subframe (slot). If a PUSCH transmission is not scheduled for a flexible subframe (slot) via UL grant, terminal device 1 monitors for PDCCH candidates in the flexible subframe (slot) and performs a process to detect DL assignment. When terminal device 1 is scheduled to receive a PDSCH via DL assignment in a flexible subframe (slot), it processes the flexible subframe (slot) as a downlink subframe (slot).

[0092] For example, downlink control information, including downlink grants or uplink grants, is transmitted and received via the PDCCH, including the C-RNTI (Cell-Radio Network Temporary Identifier).

[0093] In the downlink DCI format, DCI format 1_0 may be a first format containing scheduling information for one PDSCH (first type of downlink DCI format), or a second format containing scheduling information for multiple (e.g., two) PDSCHs (second type of downlink DCI format). In the downlink DCI format, DCI format 1_1 may be a first format containing scheduling information for one PDSCH, or a second format containing 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.

[0094] In various embodiments of this embodiment, unless otherwise specified, the number of resource blocks indicates the number of resource blocks in the frequency domain.

[0095] A downlink grant may be used for scheduling at least one PDSCH within one serving cell. A downlink grant may be used for scheduling at least multiple PDSCHs within one serving cell. A downlink grant may be used for scheduling at least multiple PDSCHs within multiple serving cells. A downlink grant may be used for scheduling a PDSCH in the same slot from which the downlink grant was sent. A downlink grant may be used for scheduling a PDSCH in a different slot from the one from which the downlink grant was sent. An uplink grant may be used for scheduling at least one PUSCH within one serving cell. An uplink grant may be used for scheduling at least multiple PUSCHs within one serving cell. An uplink grant may be used for scheduling multiple PUSCHs within multiple serving cells.

[0096] Furthermore, various DCI formats may include additional fields other than those described above. These may include a field indicating the cumulative number of PDCCHs sent (C-DAI: Counter Downlink Assignment Index field), or a field indicating the total number of PDCCHs sent (T-DAI: Total Downlink Assignment Index field).

[0097] The value of K1 (information or parameter indicated by the timing instruction field from PDSCH to HARQ feedback) indicated by the DCI format included in the PDCCH may be, for example, a value from {0, 1, 2, ..., 15}. For example, a PDSCH scheduled by the DCI format is transmitted by the base station device 3 in slot n 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 PUCCH or PUSCH.

[0098] The HARQ-ACK bits (HARQ-ACK information) corresponding to the transport blocks transmitted and received in the downlink frequency band (frequency spectrum, carrier, component carrier) of the base station device 3 are transmitted and received in the uplink frequency band (frequency spectrum, carrier, component carrier) of the base station device 3 in the manner described above, based on at least one of the various fields included in the DCI format (PDSCH-to-HARQ feedback timing indicator field, HARQ instruction field, PUCCH resource instruction field, C-DAI field, T-DAI field, UL DAI field).

[0099] A single physical channel may be mapped to a single serving cell. A single physical channel may also be mapped to a single BWP configured on a single carrier contained within a single serving cell.

[0100] Terminal device 1 may have one or more control resource sets (CORESET: CONtrolREsource SET) configured. Terminal device 1 monitors the PDCCH in one or more control resource sets. Here, monitoring the PDCCH in one or more control resource sets may include monitoring one or more PDCCHs corresponding to each of the one or more control resource sets. Note that the PDCCH may include one or more PDCCH candidates and / or a set of PDCCH candidates. Furthermore, monitoring the PDCCH may include monitoring and detecting the PDCCH and / or the DCI format transmitted through the PDCCH.

[0101] The control resource set may be a time-frequency domain to which one or more PDCCHs can be mapped. The control resource set may be a domain in which terminal device 1 monitors the PDCCHs. The control resource set may consist of localized resources. The control resource set may consist of distributed resources.

[0102] In the frequency domain, the unit of mapping for a control resource set may be a resource block. For example, in the frequency domain, the unit of mapping for a control resource set may be 6 resource blocks. In the time domain, the unit of mapping for a control resource set may be an OFDM symbol. For example, in the time domain, the unit of mapping for a control resource set may be 1 OFDM symbol.

[0103] The mapping of a control resource set to resource blocks may be given based at least on higher-level parameters. These higher-level parameters may include a bitmap for a Resource Block Group (RBG). The Resource Block Group may be given by six consecutive resource blocks.

[0104] The number of OFDM symbols constituting the control resource set may be determined based on at least higher-layer parameters. For example, the starting position of the OFDM symbols constituting the control resource set is notified from the base station device 3 to the terminal device 1 using higher-layer signaling. For example, the ending position of the OFDM symbols constituting the control resource set is notified from the base station device 3 to the terminal device 1 using higher-layer signaling.

[0105] A control resource set may be a common control resource set. A common control resource set may be a control resource set that is set in common for multiple terminal devices 1. A common control resource set may be provided based on at least some or all of the MIB, first system information, second system information, common RRC signaling, and cell IDs. For example, the time resources and / or frequency resources of a control resource set that is set to monitor the PDCCH used for scheduling the first system information may be provided based on at least the MIB.

[0106] The control resource set configured in the MIB is also referred to as CORESET#0. CORESET#0 may also be the control resource set at index #0.

[0107] A control resource set may be a dedicated control resource set. A dedicated control resource set may be a control resource set configured to be used exclusively for terminal device 1. A dedicated control resource set may be provided based on dedicated RRC signaling and some or all of the C-RNTI values. Terminal device 1 may have multiple control resource sets configured, and each control resource set may be assigned an index (control resource set index). One or more control channel elements (CCEs) may be configured within a control resource set, and each CCE may be assigned an index (CCE index).

[0108] A CCE may consist of one or more groups of REGs (Resource Element Groups). A group of REGs is also called a REG bundle. The number of REGs that make up one group of REGs is called the 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 on a REG bundle basis. Terminal device 1 may assume that the precoders applied to REs within a group of REGs are the same. Terminal device 1 can perform channel estimation assuming that the precoders applied to REs within a group of REGs are the same. On the other hand, terminal device 1 may assume that the precoders applied to REs between groups of REGs are not the same. In other words, terminal device 1 does not have to assume that the precoders applied to REs between groups of REGs are the same. "Between groups of REGs" may be rephrased as "between two different groups of REGs". Terminal device 1 can perform channel estimation assuming that the precoders applied to REs between groups of REGs are not the same.

[0109] A REG may consist of one OFDM symbol of one PRB. In other words, a REG may consist of 12 consecutive REs in the frequency domain. Some of the REs that make up a REG may not be mapped to downlink control information. A REG may include REs that do not have downlink control information mapped to them, or it may not include REs that do not have downlink control information mapped to them. REs that do not have downlink control information mapped to them may be REs to which a reference signal is mapped, REs to which channels other than the control channel are mapped, or REs to which the terminal device 1 assumes that the control channel is not mapped.

[0110] A CCE may consist of six REGs. A CCE may consist of continuously mapped REGs (such a mapping may be called a localized mapping) (such a mapping may be called a non-interleaved CCE-to-REG mapping) (such a mapping may be called a non-interleaved mapping). Not all REGs constituting a CCE are necessarily contiguous in the frequency domain. For example, if all of the multiple resource blocks constituting a control resource set are not contiguous in the frequency domain, then even if the numbers assigned to the REGs are consecutive, the resource blocks constituting each REG with consecutive numbers are not contiguous in the frequency domain. If a control resource set consists of multiple OFDM symbols, and multiple REGs constituting a single CCE are arranged across multiple time intervals (OFDM symbols), then a CCE may consist of a group of continuously mapped REGs.

[0111] A CCE may be composed of REGs that are mapped discontinuously (such a mapping may be called a distributed mapping) (such a mapping may be called an interleaved CCE-to-REG mapping) (such a mapping may be called an interleaved mapping). The REGs that constitute a CCE may be mapped discontinuously to time-frequency domain resources using an interleaver. If the control resource set consists of multiple OFDM symbols and multiple REGs that constitute one CCE are arranged across multiple time intervals (OFDM symbols), the CCE may be composed of REGs that are mixed and mapped discontinuously in different time intervals (OFDM symbols). A CCE may be composed of REGs that are mapped in a distributed manner in groups of multiple REGs. A CCE may be composed of REGs that are mapped in a distributed manner in groups of multiple REGs.

[0112] The set of PDCCH candidates monitored by terminal device 1 is defined in terms of the search space. In other words, the set of PDCCH candidates monitored by terminal device 1 is given by the search space.

[0113] The search region may consist of one or more PDCCH candidates at one or more aggregation levels. The aggregation level of a PDCCH candidate may indicate the number of CCEs that make up the PDCCH. A PDDCH candidate may be mapped to one or more CCEs.

[0114] The number of CCEs that make up a PDCCH candidate is also called the Aggregation Level (AL). When a single PDCCH candidate is composed of an aggregation of multiple CCEs, that single PDCCH candidate is composed of multiple CCEs with consecutive CCE numbers. X The set of PDCCH candidates is at aggregation level AL X It is also called the search area. In other words, the aggregation level ALX The search area is where the aggregation level is AL X The search area may consist of one or more PDCCH candidates. Furthermore, the search area may contain PDCCH candidates at multiple aggregation levels. For example, CSS may contain PDCCH candidates at multiple aggregation levels. For example, USS may contain PDCCH candidates at multiple aggregation levels. The set of aggregation levels of PDCCH candidates included in CSS and the set of aggregation levels of PDCCH candidates included in USS may be defined / configured, respectively.

[0115] Terminal device 1 may monitor at least one or more search spaces in slots where DRX (Discontinuous reception) is not set. DRX may be provided based at least on higher-layer parameters. Terminal device 1 may monitor at least one or more search space sets in slots where DRX is not set. Multiple search space sets may be configured in terminal device 1. Each search space set may be assigned an index (search space set index).

[0116] A set of search regions may consist of at least one or more search regions. Each search region may be assigned an index (search region index). A set of search regions may consist of one or more search regions corresponding to one or more aggregation levels.

[0117] Each of the search area sets may be associated with at least one control resource set. Each of the search area sets may be contained within one control resource set. Each of the search area sets may be given an index of the control resource set associated with that search area set.

[0118] The search space may have two types: CSS (Common Search Space) and USS (UE-specific Search Space). CSS may be a search space set commonly for multiple terminal devices 1. USS may be a search space containing settings used exclusively for individual terminal devices 1. CSS may be based on at least synchronization signals, MIB, first system information, second system information, common RRC signaling, dedicated RRC signaling, cell ID, etc. USS may be based on at least dedicated RRC signaling and / or the value of C-RNTI. CSS may be a search space set in a common resource (control resource element) for multiple terminal devices 1. USS may be a search space set in a resource (control resource element) for each individual terminal device 1.

[0119] The CSS may be a type 0 PDCCH CSS for DCI format scrambled by SI-RNTI used to transmit system information in the primary cell, and a type 1 PDCCH CSS for DCI format scrambled by RA-RNTI and TC-RNTI used for initial access. The CSS may also be a type PDCCH CSS for DCI format scrambled by CC-RNTI used for unlicensed access. Terminal device 1 can monitor PDCCH candidates in these search areas. The DCI format scrambled by a predetermined RNTI may be a DCI format to which a CRC (Cyclic Redundancy Check) has been added, scrambled by a predetermined RNTI.

[0120] Information related to the reception of a PDCCH may include information related to an ID indicating the destination of the PDCCH. The ID indicating the destination of the PDCCH may be an ID used for scrambling the CRC bits attached to the PDCCH. The ID indicating the destination of the PDCCH is also referred to as RNTI (Radio Network Temporary Identifier). Information related to the reception of a PDCCH may include information related to an ID used for scrambling the CRC bits attached to the PDCCH. Terminal device 1 can attempt to receive the PDCCH based at least on the information related to the ID contained in the PBCH.

[0121] 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). SI-RNTI is used at least for scheduling PDSCHs transmitted with system information. P-RNTI is used at least for scheduling PDSCHs transmitted with paging information and / or information such as system information change notifications. C-RNTI is used at least for scheduling user data to RRC-connected terminal device 1. Temporary C-RNTI is used at least for scheduling random access messages 4. Temporary C-RNTI is used at least for scheduling PDSCHs containing data mapped to CCCHs in logical channels. RA-RNTI is used at least for scheduling random access messages 2. CC-RNTI is used at least for sending and receiving control information for Unlicensed access. INT-RNTI is used at least to indicate pre-emption on the downlink.

[0122] Furthermore, the PDCCH and / or DCI included in the CSS do not necessarily need to include a CIF (Carrier Indicator Field) indicating which serving cell (or component carrier) the PDCCH / DCI is scheduling a PDSCH or PUSCH for.

[0123] Furthermore, when carrier aggregation (CA) is configured for terminal device 1 to aggregate multiple serving cells and / or multiple component carriers for communication (transmission and / or reception), the PDCCH and / or DCI included in the USS for a predetermined serving cell (predetermined component carrier) may include a CIF indicating which serving cell and / or component carrier the PDSCH or PUSCH is scheduled for.

[0124] Furthermore, when communicating with terminal device 1 using one serving cell and / or one component carrier, the PDCCH and / or DCI included in the USS do not need to include a CIF indicating which serving cell and / or component carrier the PDSCH or PUSCH is scheduled for.

[0125] A common control resource set may include CSS. A common control resource set may include both CSS and USS. A dedicated control resource set may include USS. A dedicated control resource set may include CSS.

[0126] The physical resources in the search area are composed of control channel constituent units (CCEs). A CCE is composed of a predetermined number of resource element groups (REGs). For example, a CCE may consist of six REGs. A REG may consist of one OFDM symbol in one PRB (Physical Resource Block). In other words, a REG may consist of twelve resource elements (REs). A PRB is also simply called an RB (Resource Block).

[0127] In other words, terminal device 1 can detect PDCCH and / or DCI for terminal device 1 by blindly detecting PDCCH candidates included in the search area within the control resource set.

[0128] The number of blind detections for a control resource set in a serving cell and / or component carrier may be determined based on the type of search area, the type of aggregation level, and the number of PDCCH candidates for the PDCCHs included in the control resource set. The number of PDCCH candidates for each aggregation level may be set for terminal device 1 as the search area set. Here, the search area type may include at least one of CSS and / or USS and / or UGSS (UE Group SS) and / or GCSS (Group CSS). The aggregation level type indicates the maximum aggregation level supported for the CCEs constituting the search area, and may be defined / set from at least one of {1, 2, 4, 8, ..., X} (where X is a predetermined value). The number of PDCCH candidates may indicate the number of PDCCH candidates for a given aggregation level. In other words, the number of PDCCH candidates may be defined / set for each of multiple aggregation levels. Note that UGSS may be a search area that is commonly assigned to one or more terminal devices 1. GCSS may be a search area to which DCIs containing CSS-related parameters are mapped for one or more terminal devices 1. The aggregation level indicates an aggregation level for a predetermined number of CCEs and is related to the total number of CCEs constituting one PDCCH and / or search area.

[0129] The size of the aggregation level may be associated with the coverage corresponding to the PDCCH and / or search area, or the size of the DCIs included in the PDCCH and / or search area (DCI format size, payload size). A specific type of DCI format may be configured for monitoring for each search area.

[0130] Furthermore, if a start position (start symbol) for a PDCCH symbol is set for a single control resource set, and more than one PDCCH can be detected within the control resource set during a predetermined period, the type of search area, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set for the time domain corresponding to each start symbol. If there is more than one start position (start symbol) for a single control resource set, that is, if there are multiple timings for blind detection (monitoring) of PDCCH during a predetermined period, the type of search area, the type of aggregation level, and the number of PDCCH candidates for the PDCCH included in the control resource set may be set for each control resource set, provided / set via DCI and / or higher-layer signals (RRC signaling), or predetermined / set by the specification. Furthermore, the number of PDCCH candidates may be the number of PDCCH candidates for a predetermined period. The specified period may be 1 millisecond. The specified period may be 1 microsecond. The specified period may also be the duration of one slot. The specified period may also be the duration of one OFDM symbol.

[0131] Furthermore, the number of PDCCH candidates may be expressed in a configuration where the number of candidates to be reduced from a predetermined number is specified / set for each aggregation level.

[0132] Terminal device 1 may transmit / notify base station device 3 of capability information related to blind detection. Terminal device 1 may transmit / notify base station device 3 of the number of PDCCH candidates that can be processed in one subframe as capability information regarding PDCCH. Terminal device 1 may transmit / notify base station device 3 of capability information related to blind detection if more than a predetermined number of control resource sets can be configured for one or more serving cells / component carriers. Terminal device 1 may transmit / notify base station device 3 of the number of PDCCH candidates that can be processed in one slot as capability information regarding PDCCH. Terminal device 1 may transmit / notify base station device 3 of the number of PDCCH candidates that can be processed in multiple slots (e.g., 4 slots, 8 slots) as capability information regarding PDCCH. Terminal device 1 may transmit / notify base station device 3 of capability information related to blind detection of PDCCH for each subcarrier interval.

[0133] Terminal device 1 may transmit / notify base station device 3 of capability information related to blind detection if it is possible to configure more than a predetermined number of control resource sets for a predetermined period of one or more serving cells / component carriers.

[0134] The capability information related to blind detection may include information indicating the maximum number of blind detections in a predetermined period. It may also include information indicating that PDCCH candidates can be reduced. Furthermore, the capability information related to blind detection may include information indicating the maximum number of control resource sets capable of blind detection in a predetermined period. The maximum number of control resource sets and the maximum number of serving cells and / or component carriers capable of monitoring PDCCHs may be set as individual parameters or as common parameters. Additionally, the capability information related to blind detection may include information indicating the maximum number of control resource sets capable of simultaneous blind detection in a predetermined period.

[0135] If terminal device 1 does not support the ability to detect more than a predetermined number of control resource sets (blind detection) within a predetermined period, it does not need to transmit / notify capability information related to blind detection. If base station device 3 does not receive capability information related to blind detection, it may configure the control resource sets so as not to exceed a predetermined number for blind detection and transmit PDCCH.

[0136] The settings for a control resource set may include a parameter indicating an index (ControlResourceSetId) that identifies the control resource set. The settings for a control resource set may also include a parameter indicating the frequency resource domain of the control resource set (the number of resource blocks that make up the control resource set). Furthermore, the settings for a control resource set may include a parameter indicating the type of mapping from CCE to REG. The settings for a control resource set may also include the REG bundle size. RRC signaling may be used to send and receive messages indicating the settings for a control resource set. SIBs may be used to send and receive messages indicating the settings for a control resource set. MIBs may be used to send and receive messages indicating the settings for a control resource set.

[0137] The search area settings may include a parameter indicating an index that identifies the search area (search area index). The search area settings may include a parameter indicating the index of the control resource set in which the search area is located. The search area settings may include parameters indicating the period and offset (the relative position of the slot in which the search area is located) of the slot in which the search area is located. The search area settings may include a parameter indicating the number of consecutive slots in which the search area is located. The search area settings may include a parameter indicating the OFDM symbol in the slot in which PDCCH candidates are monitored. The search area settings may include a parameter indicating the number of PDCCH candidates monitored for each CCE aggregation level. The search area settings may include a parameter indicating the DCI format being monitored. The search area settings may include a parameter indicating the type of search area (CSS or USS). RRC signaling may be used to send and receive messages indicating the search area settings. SIBs may be used to send and receive messages indicating the search area settings. MIBs may be used to send and receive messages indicating the search area settings.

[0138] As a parameter indicating the DCI format being monitored, a downlink grant containing scheduling information for multiple PDSCHs may be included in the search area settings. As a parameter indicating the DCI format being monitored, a downlink grant containing scheduling information for multiple PDSCHs for multiple slots may be included in the search area settings. As a parameter indicating the DCI format being monitored, a downlink grant containing scheduling information for multiple PDSCHs of multiple cells may be included in the search area settings. As a parameter indicating the DCI format being monitored, a downlink grant containing scheduling information for multiple PDSCHs of multiple cells may be included in the search area settings. Here, "multiple cells" may refer to the cell to which the search area is set and the cell to which cross-carrier scheduling is applied from the cell to which the search area is set.

[0139] Base station device 3 sets a search area for terminal device 1. Base station device 3 transmits information about the search area settings to terminal device 1. Terminal device 1 receives information about the search area settings from base station device 3. Terminal device 1 sets a search area based on the information received from base station device 3.

[0140] PDSCH may be used at least to send / receive transport blocks. PDSCH may also be used at least to send / receive random access messages 2 (random access responses). PDSCH may also be used at least to send / receive system information, including parameters used for initial access.

[0141] In Figure 1, the following downlink physical signals are used in downlink wireless communication. Downlink physical signals do not necessarily have to be used to transmit information output from higher layers, but they 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)

[0142] The synchronization signal is used by terminal device 1 to synchronize the downlink in the frequency domain and / or time domain. The synchronization signal includes PSS (Primary Synchronization Signal) and SSS (Secondary Synchronization Signal).

[0143] An SS block (SS / PBCH block) consists of at least some or all of PSS, SSS, and PBCH.

[0144] DL DMRS is associated with the transmission of PBCH, PDCCH, and / or PDSCH. DL DMRS is multiplexed to PBCH, PDCCH, and / or PDSCH. Terminal device 1 may use the DL DMRS corresponding to the PBCH, PDCCH, or PDSCH to perform propagation path correction for the PBCH, PDCCH, or PDSCH. Terminal device 1 may determine that base station device 3 is transmitting a signal based on the detection of DL DMRS.

[0145] CSI-RS may be a signal used to calculate channel state information. The CSI-RS pattern assumed by terminal device 1 may be given by at least upper-layer parameters.

[0146] PTRS may be a signal used at least for phase noise compensation. The PTRS pattern assumed by terminal device 1 may be given at least based on higher layer parameters and / or DCI.

[0147] DL PTRS may be associated with a DL DMRS group that includes at least one antenna port used for DL ​​DMRS.

[0148] Furthermore, downlink physical signals not mentioned above may also be used.

[0149] Downlink physical channels and downlink physical signals are also called downlink signals. Uplink physical channels and uplink physical signals are also called uplink signals. Downlink signals and uplink signals are collectively referred to as physical signals. Downlink signals and uplink signals are collectively referred to as signals. Downlink physical channels and uplink physical channels are collectively referred to as physical channels. Downlink physical signals and uplink physical signals are collectively referred to as physical signals.

[0150] BCH (Broadcast Channel), UL-SCH (Uplink-Shared Channel), and DL-SCH (Downlink-Shared Channel) are transport channels. Channels used in the Medium Access Control (MAC) layer are called transport channels. The unit of 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 the unit of data that the MAC layer delivers to the physical layer. In the physical layer, transport blocks are mapped to codewords, and modulation processing is performed for each codeword.

[0151] The base station device 3 and the terminal device 1 exchange (send and receive) higher layer signals at the higher layer. For example, the base station device 3 and the terminal device 1 may send and receive RRC signaling (RRC message: Radio Resource Control message; RRC information: Radio Resource Control information) at the Radio Resource Control (RRC) layer. Also, the base station device 3 and the terminal device 1 may send and receive MAC CE (Control Element) at the MAC layer. Here, RRC signaling and / or MAC CE are also referred to as higher layer signaling.

[0152] PUSCH and PDSCH may be used at least to transmit RRC signaling and / or MAC CE. Here, the RRC signaling transmitted by PDSCH from base station equipment 3 may be a common signaling to multiple terminal devices 1 within a serving cell. A common signaling to multiple terminal devices 1 within a serving cell is also called a common RRC signaling. The RRC signaling transmitted by PDSCH from base station equipment 3 may be a dedicated signaling (also called dedicated signaling or UE specific signaling) to a particular terminal device 1. A dedicated signaling to a terminal device 1 is also called a dedicated RRC signaling. Upper layer parameters specific to a serving cell may be transmitted / received using a common signaling to multiple terminal devices 1 within a serving cell, or a dedicated signaling to a particular terminal device 1. Upper layer parameters specific to a UE may be transmitted / received using a dedicated signaling to a particular terminal device 1.

[0153] BCCH (Broadcast Control Channel), CCCH (Common Control Channel), and DCCH (Dedicated Control Channel) are logical channels. For example, BCCH is a higher-layer channel used to transmit / receive MIBs. CCCH (Common Control Channel) is a higher-layer channel used to transmit / receive common information among multiple terminal devices 1. Here, CCCH may be used, for example, for terminal devices 1 that are not connected via RRC. DCCH (Dedicated Control Channel) is a higher-layer channel used to transmit / receive dedicated control information to terminal devices 1. Here, DCCH may be used, for example, for terminal devices 1 that are connected via RRC.

[0154] BCCH in the logical channel may be mapped to BCH, DL-SCH, or UL-SCH in the transport channel. CCCH in the logical channel may be mapped to DL-SCH or UL-SCH in the transport channel. DCCH in the logical channel may be mapped to DL-SCH or UL-SCH in the transport channel.

[0155] UL-SCH in the transport channel may be mapped to PUSCH in the physical channel. DL-SCH in the transport channel may be mapped to PDSCH in the physical channel. BCH in the transport channel may be mapped to PBCH in the physical channel.

[0156] The following describes an example of the configuration of a terminal device 1 according to one aspect of this embodiment.

[0157] Figure 5 is a schematic block diagram showing the configuration of a terminal device 1 according to one aspect of this embodiment. As shown in the figure, the terminal device 1 is composed of a wireless transceiver unit 10 and a higher layer processing unit 14. The wireless transceiver unit 10 is composed of at least part or all of an antenna unit 11, an RF (Radio Frequency) unit 12, and a baseband unit 13. The higher layer processing unit 14 is composed of at least part or all of a media access control layer processing unit 15 and a wireless resource control layer processing unit 16. The wireless transceiver unit 10 is also referred to as the transmitting unit, receiving unit, or physical layer processing unit.

[0158] The physical layer processing unit includes a decoding unit. The receiving unit (also called the receiving processing unit) of terminal device 1 receives PDCCHs. The decoding unit of terminal device 1 decodes the received PDCCHs. More specifically, the decoding unit of terminal device 1 performs blind decoding on the received signals of the resources corresponding to the USS PDCCH candidates. The decoding unit of terminal device 1 performs blind decoding on the received signals of the resources corresponding to the CSS PDCCH candidates. The receiving processing unit of terminal device 1 monitors PDCCH candidates within the control resource set. The receiving processing unit of terminal device 1 monitors PDCCH candidates within the control resource set. The decoding unit of terminal device 1 performs different blind decoding processes for each DCI format of different sizes.

[0159] The receiving unit of terminal device 1 receives a control signal (first control signal). The receiving unit of terminal device 1 receives a control signal located within the same resource (resource block) as the PDSCH. Here, the control signal is a signal indicating the slot where blind decoding will be performed next. The slot where blind decoding will be performed next may be indicated by an offset from the slot where the control signal was received. The control signal may also be a signal indicating the control resource set (first control resource set) where blind decoding will be performed next. The control signal may also be a signal indicating the search area (first search area) where blind decoding will be performed next. The control signal may also be a signal indicating a PDCCH candidate where blind decoding will be performed next. The control signal may also be a signal indicating information (number, offset from a certain reference) about the control resource element where blind decoding will be performed next. The control signal may also be a signal indicating that PDCCH monitoring will be performed next in the first control resource set. The control signal may also be a signal indicating that PDCCH monitoring will be performed next in the first search area. The decoding unit of terminal device 1 decodes the received control signal. The receiving unit of terminal device 1 receives the PDCCH based on the decoded control signal.

[0160] The receiving unit of terminal device 1 receives PDCCH in the first control resource set. The receiving unit of terminal device 1 receives PDCCH in the second control resource set. The receiving unit of terminal device 1 monitors PDCCH candidates in the first control resource set. The receiving unit of terminal device 1 monitors PDCCH candidates in the second control resource set. The receiving unit of terminal device 1 monitors PDCCH candidates in the first search area. The receiving unit of terminal device 1 monitors PDCCH candidates in the second search area. The receiving unit of terminal device 1 monitors PDCCH in the first control resource set. The receiving unit of terminal device 1 monitors PDCCH in the second control resource set.

[0161] The receiving unit of terminal device 1 receives PDCCH in the first control resource set based on the first control signal. The receiving unit of terminal device 1 receives PDCCH in the second control resource set without relying on the first control signal. The receiving unit of terminal device 1 monitors PDCCH candidates in the first control resource set based on the first control signal. The receiving unit of terminal device 1 monitors PDCCH candidates in the second control resource set without relying on the first control signal. The receiving unit of terminal device 1 monitors PDCCH candidates in the first search area based on the first control signal. The receiving unit of terminal device 1 monitors PDCCH candidates in the second search area without relying on the first control signal. The receiving unit of terminal device 1 monitors PDCCH candidates in the first search area of ​​the first control resource set based on the first control signal. The receiving unit of terminal device 1 monitors PDCCH candidates in the second search area of ​​the second control resource set without relying on the first control signal. The first control signal triggers the receiving unit of terminal device 1 to monitor PDCCH in the first search area. If not triggered by the first control signal, the receiving unit of terminal device 1 will not monitor PDCCH in the first search area. The first control signal triggers the receiving unit of terminal device 1 to monitor PDCCH in the first search area within the first control resource set. If not triggered by the first control signal, the receiving unit of terminal device 1 will not monitor PDCCH in the first search area within the first control resource set.

[0162] The first control signal may be encoded differently from the PDSCH. The PDSCH signal may be rate-matched and the first control signal may be placed. The PDSCH signal may be punctured and the first control signal may be placed. The first control signal may be modulated differently from the PDSCH. The first control signal may be placed on the resource of an OFDM symbol preceding the slot. The first control signal may be placed in the same slot as the last PDSCH in the time domain of multiple PDSCHs. The first control signal may be placed in the same slot as the last PDSCH in which the allocation of a time domain resource (OFDM symbol resource) is indicated in a DCI format (second DCI format) in which resource allocation of multiple PDSCHs is performed in one DCI format. Such arrangements eliminate the need for signal exchange indicating the PDSCH in which the first control signal is placed, improving frequency utilization efficiency.

[0163] The transmitting unit (also called the transmitting processing unit) of terminal device 1 transmits a HARQ-ACK. The transmitting processing unit of terminal device 1 transmits a HARQ-ACK to the PDSCH. The transmitting processing unit of terminal device 1 transmits a HARQ-ACK in the uplink frequency band (cell, component carrier, carrier) managed by base station device 3. The transmitting processing unit of terminal device 1 transmits a HARQ-ACK to the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by base station device 3. The transmitting processing unit of terminal device 1 transmits a HARQ-ACK to the PDSCH in the downlink frequency band (cell, component carrier, carrier) managed by base station device 3 in the uplink frequency band (cell, component carrier, carrier) managed by base station device 3.

[0164] The upper layer processing unit 14 outputs the uplink data (transport block) generated by user operations, etc., to the wireless transceiver unit 10. The upper layer processing unit 14 performs processing at the MAC layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, and RRC layer.

[0165] The media access control layer processing unit 15, which is part of the upper layer processing unit 14, performs MAC layer processing.

[0166] The wireless resource control layer processing unit 16, located in the upper layer processing unit 14, performs RRC layer processing. The wireless resource control layer processing unit 16 manages various setting information / parameters of its own device. The wireless resource control layer processing unit 16 sets various setting information / parameters based on the upper layer signals received from the base station device 3. That is, the wireless 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. This setting information may include information related to the processing or setting of physical channels and physical signals (i.e., the physical layer), MAC layer, PDCP layer, RLC layer, and RRC layer. These parameters may also be upper layer parameters.

[0167] The wireless resource control layer processing unit 16 sets the control resource set based on the RRC signaling received from the base station device 3. The wireless resource control layer processing unit 16 sets the search area within the control resource set. The wireless resource control layer processing unit 16 sets the PDCCH candidates to be monitored within the control resource set. The wireless resource control layer processing unit 16 sets the number of PDCCH candidates to be monitored within the control resource set. The wireless resource control layer processing unit 16 sets the aggregation level of the PDCCH candidates to be monitored within the control resource set.

[0168] The wireless resource control layer processing unit 16 sets (configures) the first control resource set. The wireless resource control layer processing unit 16 sets (configures) the second control resource set. The wireless resource control layer processing unit 16 sets (configures) the first search area. The wireless resource control layer processing unit 16 sets (configures) the second search area. The wireless resource control layer processing unit 16 sets (configures) the first search area within the first control resource set. The wireless resource control layer processing unit 16 sets (configures) the second search area within the second control resource set.

[0169] The wireless resource control layer processing unit 16 sets the DCI format to be monitored within the control resource set. The wireless resource control layer processing unit 16 may also set the DCI format to be monitored within the search area. The wireless resource control layer processing unit 16 sets the DCI format to be monitored within the control resource set based on the RRC signaling indicated from the base station device 3. The wireless resource control layer processing unit 16 may also set the DCI format to be monitored within the search area based on the RRC signaling indicated from the base station device 3. The wireless resource control layer processing unit 16 sets one or more DCI formats to be monitored in the receiving processing unit.

[0170] The wireless transceiver unit 10 performs physical layer processing such as modulation, demodulation, coding, and decoding. The wireless transceiver unit 10 separates, demodulates, and decodes the received physical signal and outputs the decoded information to the upper layer processing unit 14. The wireless transceiver unit 10 generates a physical signal by modulating, coding, and generating a baseband signal (conversion to a time-continuous signal) the data and transmits it to the base station device 3.

[0171] The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal by quadrature demodulation (downconvert) and removes unwanted frequency components. The RF unit 12 outputs the processed analog signal to the baseband unit.

[0172] The baseband section 13 converts the analog signal input from the RF section 12 into a digital signal. The baseband section 13 removes the portion corresponding to the Cyclic Prefix (CP) from the converted digital signal, and performs a Fast Fourier Transform (FFT) on the signal from which the CP has been removed to extract the signal in the frequency domain.

[0173] The baseband unit 13 performs an inverse fast Fourier transform (IFFT) on the data to generate an OFDM symbol, adds a CP to the generated OFDM symbol to generate a baseband digital signal, and converts the baseband digital signal into an analog signal. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

[0174] The RF unit 12 uses a low-pass filter to remove unwanted frequency components from the analog signal input from the baseband unit 13, upconverts the analog signal to the carrier frequency, and transmits it via the antenna unit 11. The RF unit 12 also amplifies the power. The RF unit 12 may also have a function to control the transmission power. The RF unit 12 is also referred to as the transmission power control unit.

[0175] Terminal device 1 receives PDCCH. Terminal device 1 receives PDSCH. The wireless resource control layer processing unit 16 sets the control resource set. The wireless resource control layer processing unit 16 sets the search area. The wireless resource control layer processing unit 16 sets the control resource set based on RRC signaling. The wireless resource control layer processing unit 16 sets the search area based on RRC signaling. The receiving unit of terminal device 1 monitors multiple PDCCH candidates within the search area of ​​the set control resource set. The receiving unit of terminal device 1 monitors multiple PDCCH candidates within the search area of ​​the set control resource set in a certain slot. The receiving unit of terminal device 1 monitors PDCCH candidates assuming the DCI format. The decoding unit of terminal device 1 decodes the monitored PDCCH candidates. The decoding unit of terminal device 1 decodes the PDCCH candidates to obtain the downlink DCI format and recognizes the scheduling information of the PDSCH. The decoding unit of terminal device 1 decodes the received PDSCH.

[0176] The receiving unit of terminal device 1 monitors PDCCH candidates based on a number set based on RRC signaling within the search area of ​​the control resource set in a given slot. The receiving unit of terminal device 1 monitors PDCCH candidates consisting of one or more OFDM symbols set based on RRC signaling within the search area of ​​the control resource set in a given slot. The receiving unit of terminal device 1 may also monitor PDCCH candidates by setting three or more search areas, each of which is a different OFDM symbol search area, and distributing them within the slot. The receiving unit of terminal device 1 monitors PDCCH candidates assuming a DCI format set based on RRC signaling.

[0177] The receiving unit of terminal device 1 monitors PDCCH candidates in the search area of ​​the second control resource set using a slot configured based on RRC signaling. The receiving unit of terminal device 1 monitors PDCCH candidates in the second search area of ​​the second control resource set using a slot configured based on RRC signaling. If the receiving unit of terminal device 1 is indicated to monitor PDCCH candidates in the search area of ​​the first control resource set based on the first control signal, it monitors PDCCH candidates in the search area of ​​the first control resource set using a slot configured based on RRC signaling. If the receiving unit of terminal device 1 is indicated to monitor PDCCH candidates in the first search area of ​​the first control resource set based on the first control signal, it monitors PDCCH candidates in the first search area of ​​the first control resource set using a slot configured based on RRC signaling. The receiving unit of terminal device 1 monitors PDCCH candidates in the search area of ​​the first control resource set using a slot indicated by the first control signal. The receiving unit of terminal device 1 monitors PDCCH candidates in the first search area of ​​the first control resource set in the slot indicated by the first control signal. The receiving unit of terminal device 1 monitors PDCCH candidates indicated by the first control signal within the search area of ​​the first control resource set. The receiving unit of terminal device 1 monitors PDCCH candidates indicated by the first control signal within the first search area of ​​the first control resource set. The receiving unit of terminal device 1 monitors PDCCH candidates that include the control resource element (number, offset from a certain reference) indicated by the first control signal within the search area of ​​the first control resource set. The receiving unit of terminal device 1 monitors PDCCH candidates that include the control resource element (number, offset from a certain reference) indicated by the first control signal within the first search area of ​​the first control resource set. The receiving unit of terminal device 1 does not monitor for PDCCH candidates in the search area of ​​the first control resource set if the first control signal does not indicate that it is monitoring for PDCCH candidates.

[0178] Comparing the number of PDCCH candidates in the first search region with the number of PDCCH candidates in the second search region, many PDCCH candidates are configured in the second search region, while few PDCCH candidates are configured in the first search region. Many PDCCH candidates are configured in a slot in the second search region, while few PDCCH candidates are configured in a slot in the first search region.

[0179] The following describes an example of the configuration of a base station device 3 according to one aspect of this embodiment.

[0180] Figure 6 is a schematic block diagram showing the configuration of a base station device 3 according to one aspect of this embodiment. As shown in the figure, the base station device 3 is composed of a wireless transceiver unit 30 and a higher layer processing unit 34. The wireless transceiver unit 30 is composed of an antenna unit 31, an RF unit 32, and a baseband unit 33. The higher layer processing unit 34 is composed of a media access control layer processing unit 35 and a wireless resource control layer processing unit 36. The wireless transceiver unit 30 is also referred to as the transmitting unit, receiving unit, or physical layer processing unit.

[0181] The upper layer processing unit 34 performs processing for the MAC layer, PDCP layer, RLC layer, and RRC layer.

[0182] The media access control layer processing unit 35, which is part of the upper layer processing unit 34, performs MAC layer processing.

[0183] The wireless resource control layer processing unit 36, located in the upper layer processing unit 34, performs RRC layer processing. The wireless resource control layer processing unit 36 ​​generates or acquires downlink data (transport blocks), system information, RRC messages, MAC CE, etc., placed on the PDSCH, from the upper layer node and outputs them to the wireless transceiver unit 30. The wireless resource control layer processing unit 36 ​​also manages various setting information / parameters for each terminal device 1. The wireless resource control layer processing unit 36 ​​may set various setting information / parameters for each terminal device 1 via upper layer signals. That is, the wireless resource control layer processing unit 36 ​​transmits / announces information indicating various setting information / parameters. This setting information may include information related to the processing or setting of the physical channel and physical signal (i.e., the physical layer), MAC layer, PDCP layer, RLC layer, and RRC layer. These parameters may be upper layer parameters.

[0184] The wireless 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 wireless resource control layer processing unit 36 ​​sets a search area for the terminal device 1. The wireless resource control layer processing unit 36 ​​sets the DCI format to be monitored in the search area for the terminal device 1. The wireless resource control layer processing unit 36 ​​sets resources for transmitting HARQ-ACK for the terminal device 1.

[0185] The wireless resource control layer processing unit 36 ​​sets the DCI format to be applied to terminal device 1 within the control resource set. The wireless resource control layer processing unit 36 ​​generates RRC signaling indicating the DCI format to be applied to terminal device 1. The wireless resource control layer processing unit 36 ​​sets one or more DCI formats to be applied in the transmission processing unit.

[0186] The functions of the wireless transceiver 30 are the same as those of the wireless transceiver 10, so their explanation will be omitted as appropriate. The wireless transceiver 30 also grasps the SS (Search space) configured in the terminal device 1. The wireless transceiver 30 grasps the search area within the control resource set configured in the terminal device 1. The wireless transceiver 30 grasps the PDCCH candidates monitored in the terminal device 1 and grasps the search area. The wireless transceiver 30 grasps which control channel element each PDCCH candidate monitored in the terminal device 1 is composed of (it grasps the control channel element number to which the PDCCH candidate is composed). The wireless transceiver 30 includes an SS grasping unit, which grasps the SS configured in the terminal device 1. The SS grasping unit grasps one or more PDCCH candidates within the control resource set that are configured as the Search space of the terminal device. The SS grasping unit grasps the PDCCH candidates (number of PDCCH candidates, PDCCH candidate numbers) configured in the search area of ​​the control resource set of the terminal device 1.

[0187] The SS understanding unit understands the configuration of the search area within the control resource set (number of PDCCH candidates, OFDM symbols of the PDCCH candidates, and aggregation level of the PDCCH candidates). The transmission unit (transmission processing unit) of the wireless transceiver 30 transmits a PDCCH to the terminal device 1 using the PDCCH candidates within the search area of ​​the control resource set.

[0188] The wireless resource control layer processing unit 36 ​​sets (configures) the first control resource set. The wireless resource control layer processing unit 36 ​​sets (configures) the second control resource set. The wireless resource control layer processing unit 36 ​​sets (configures) the first search area. The wireless resource control layer processing unit 36 ​​sets (configures) the second search area. The wireless resource control layer processing unit 36 ​​sets (configures) the first search area within the first control resource set. The wireless resource control layer processing unit 36 ​​sets (configures) the second search area within the second control resource set.

[0189] The wireless transceiver 30 (transmitter, transmission processing unit) controls the transmission of the first control signal. The wireless transceiver 30 transmits the first control signal. The wireless transceiver 30 places the first control signal within the same resource (resource block) as the PDSCH and transmits it. Here, the first control signal is a signal indicating the slot where blind decoding will be performed next in the terminal device 1. The slot where blind decoding will be performed next in the terminal device 1 may be indicated by an offset from the slot to which the control signal was transmitted. The first control signal may also be a signal indicating the control resource set (first control resource set) where blind decoding will be performed next in the terminal device 1. The first control signal may also be a signal indicating the search area (first search area) where blind decoding will be performed next in the terminal device 1. The first control signal may also be a signal indicating a PDCCH candidate where blind decoding will be performed next in the terminal device 1. The first control signal may also be a signal indicating information (number, offset from a certain reference) about the control resource element where blind decoding will be performed next in the terminal device 1. The first control signal may also be a signal indicating that PDCCH monitoring will be performed next in the first control resource set in the terminal device 1. The first control signal may also be a signal indicating that PDCCH monitoring will be performed in the first search area at terminal device 1. The wireless transceiver 30 of base station device 3 encodes the first control signal.

[0190] The wireless transceiver 30 controls the SS finding unit based on the control of the first control signal. Based on the first control signal, the SS finding unit identifies PDCCH candidates in the first control resource set as PDCCH candidates that may be used for transmitting a PDCCH. Based on the first control signal, the SS finding unit identifies PDCCH candidates in the first search area as PDCCH candidates that may be used for transmitting a PDCCH. Based on the first control signal, the SS finding unit identifies PDCCH candidates in the first search area within the first control resource set as PDCCH candidates that may be used for transmitting a PDCCH. The SS finding unit controls the wireless transceiver 30 to transmit a PDCCH using one of the identified PDCCH candidates.

[0191] The wireless transceiver 30 may rate-match the PDSCH signals to place the first control signal. The wireless transceiver 30 may puncture the PDSCH signals to place the first control signal. The wireless transceiver 30 may place the first control signal on the OFDM symbol resource preceding the slot. The wireless transceiver 30 may place the first control signal on the same slot as the last PDSCH in the time domain of multiple PDSCHs. The wireless transceiver 30 may place the first control signal on the same slot as the last PDSCH in which a resource allocation (OFDM symbol resource) in a valid time domain is indicated in a DCI format (second DCI format) in which resource allocation for multiple PDSCHs is performed in one DCI format. With such arrangements, there is no need for the exchange of signals indicating the PDSCH on which the first control signal is placed between the terminal device 1 and the base station device 3, and frequency utilization efficiency is improved.

[0192] The wireless transceiver 30 identifies PDCCH candidates in the second control resource set as PDCCH candidates that may be used for transmitting a PDCCH. The SS identification unit identifies PDCCH candidates in the second search area as PDCCH candidates that may be used for transmitting a PDCCH. The SS identification unit identifies PDCCH candidates in the second search area within the second control resource set as PDCCH candidates that may be used for transmitting a PDCCH. The SS identification unit controls the wireless transceiver 30 to transmit a PDCCH using one of the identified PDCCH candidates.

[0193] The receiving unit (also called the receiving processing unit) of base station device 3 receives HARQ-ACK. The receiving processing unit of base station device 3 receives HARQ-ACK for PDSCH. The receiving processing unit of base station device 3 receives HARQ-ACK in the uplink frequency band (cell, component carrier, carrier). The receiving processing unit of base station device 3 receives HARQ-ACK for PDSCH in the downlink frequency band (cell, component carrier, carrier) in the uplink frequency band (cell, component carrier, carrier).

[0194] Each of the parts designated by reference numerals 10 to 16 in the terminal device 1 may be configured as a circuit. Each of the parts designated by reference numerals 30 to 36 in the base station device 3 may be configured as a circuit.

[0195] Terminal device 1 transmits uplink control information (UCI) to base station device 3. Terminal device 1 may also transmit the UCI multiplexed with PUCCH. Terminal device 1 may also transmit the UCI multiplexed with PUSCH. The UCI may include at least one of the following: downlink channel state information (CSI), scheduling request (SR) indicating a request for PUSCH resources, and HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement) for downlink data (Transport block, Medium Access Control Protocol Data Unit: MAC PDU, Downlink-Shared Channel: DL-SCH, Physical Downlink Shared Channel: PDSCH).

[0196] 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.

[0197] If downlink data is successfully decoded, an ACK is generated for the downlink data. If downlink data is not successfully decoded, a NACK is generated for the downlink data. A HARQ-ACK may include at least HARQ-ACK bits corresponding to at least one transport block. HARQ-ACK bits may indicate an ACK (ACKnowledgement) or a NACK (Negative-ACKnowledgement) corresponding to one or more transport blocks. A HARQ-ACK may include at least a HARQ-ACK codebook containing one or more HARQ-ACK bits. HARQ-ACK bits corresponding to one or more transport blocks may correspond to a PDSCH containing the one or more transport blocks.

[0198] HARQ control over a single transport block may be called a HARQ process. Each HARQ process may be assigned a unique HARQ process identifier. The DCI format includes a field indicating the HARQ process identifier.

[0199] A New Data Indicator (NDI) is represented in DCI format for each HARQ process. For example, the DCI format (DL assignment) containing scheduling information for a PDSCH includes an NDI field. The NDI field is 1 bit. Terminal device 1 stores (remembers) the NDI value for each HARQ process. Base station device 3 stores (remembers) the NDI value for each HARQ process for each terminal device 1. Terminal device 1 updates the stored NDI value using the detected NDI field in DCI format. Base station device 3 sets the updated NDI value, or the NDI value that has not been updated, in the NDI field in DCI format and transmits it to terminal device 1. Terminal device 1 updates the stored NDI value using the detected NDI field in DCI format for the HARQ process corresponding to the value of the detected HARQ process identifier field in DCI format.

[0200] Terminal device 1 determines whether a received transport block is a new transmission or a retransmission based on the value of the NDI field in the DCI format (DL assignment). Terminal device 1 compares the value of the NDI field in the DCI format that was previously received for a transport block of a certain HARQ process, and if the value of the NDI field in the DCI format that was previously toggled, it determines that the received transport block is a new transmission. When base station device 3 transmits a transport block as a new transmission in a certain HARQ process, it toggles the value of the NDI stored for that HARQ process and sends the toggled NDI to terminal device 1. When base station device 3 transmits a transport block as a retransmission in a certain HARQ process, it does not toggle the value of the NDI stored for that HARQ process and sends the untoggled NDI to terminal device 1. When terminal device 1 compares the value of the NDI field in the DCI format that was previously received for a transport block of a certain HARQ process, it determines that the received transport block is a retransmission if the value of the NDI field in the DCI format that was previously received is not toggled (they are the same). Note that "toggle" here means switching to a different value.

[0201] Terminal device 1 may report HARQ-ACK information to base station device 3 using a HARQ-ACK codebook in a slot indicated by the value of the HARQ instruction field included in DCI format 1_0 or DCI format 1_1 that corresponds to PDSCH reception.

[0202] For DCI format 1_0, the value of the HARQ instruction 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 instruction field may be mapped to a set of slot numbers given by the upper layer parameter dl-DataToUL-ACK. The number of slots indicated, at least based on the value of the HARQ instruction field, may also be called the HARQ-ACK timing or K1. For example, a HARQ-ACK representing the decoded state of PDSCH (downlink data) transmitted in slot n may be reported (transmitted) in slot n+K1.

[0203] dl-DataToUL-ACK represents a list of HARQ-ACK timings for a PDSCH. Timing is the number of slots between the slot in which the PDSCH was received (or the slot containing the last OFDM symbol to which the PDSCH is mapped) and the slot in which the HARQ-ACK for the received PDSCH is sent. 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 indicator field is 0 bits. If dl-DataToUL-ACK is a list of 2 timings, the HARQ indicator field is 1 bit. If dl-DataToUL-ACK is a list of 3 or 4 timings, the HARQ indicator field is 2 bits. If dl-DataToUL-ACK is a list of 5, 6, 7, or 8 timings, the HARQ indicator field is 3 bits. For example, dl-DataToUL-ACK consists of a list of timings with values ​​ranging from 0 to 31. For example, dl-DataToUL-ACK consists of a list of timings with values ​​ranging from 0 to 63.

[0204] The size of dl-DataToUL-ACK is defined as the number of elements that dl-DataToUL-ACK contains. para It may also be called . 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 If =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 indicator field.

[0205] Terminal device 1 may set the size of the HARQ-ACK codebook according to the size of dl-DataToUL-ACK. For example, if dl-DataToUL-ACK consists of 8 elements, the size of the HARQ-ACK codebook is 8. For example, if dl-DataToUL-ACK consists of 2 elements, the size of the HARQ-ACK codebook is 2. Each HARQ-ACK piece of information constituting the HARQ-ACK codebook is HARQ-ACK information for PDSCH reception at each slot timing of dl-DataToUL-ACK. This type of HARQ-ACK codebook is also called a semi-static HARQ-ACK codebook.

[0206] An example of setting the HARQ instruction field is described below. For example, dl-DataToUL-ACK consists of a list of eight timings: 0, 7, 15, 23, 31, 39, 47, and 55, and the HARQ instruction field consists of 3 bits. A HARQ instruction field of "000" corresponds to the first 0 in the dl-DataToUL-ACK list as the corresponding timing. That is, a HARQ instruction field of "000" corresponds to the value 0 indicated by index 1 in dl-DataToUL-ACK. A HARQ instruction field of "001" corresponds to the second 7 in the dl-DataToUL-ACK list as the corresponding timing. A HARQ instruction field of "010" corresponds to the third 15 in the dl-DataToUL-ACK list as the corresponding timing. A HARQ instruction field of "011" corresponds to the fourth 23 in the dl-DataToUL-ACK list as the corresponding timing. A HARQ instruction field of "100" corresponds to the 5th entry, 31, in the dl-DataToUL-ACK list as the corresponding timing. A HARQ instruction field of "101" corresponds to the 6th entry, 39, in the dl-DataToUL-ACK list as the corresponding timing. A HARQ instruction field of "110" corresponds to the 7th entry, 47, in the dl-DataToUL-ACK list as the corresponding timing. A HARQ instruction field of "111" corresponds to the 8th entry, 55, in the dl-DataToUL-ACK list as the corresponding timing. If the received HARQ instruction field indicates "000", terminal device 1 sends the corresponding HARQ-ACK in the 0th slot from the slot of the received PDSCH. If the received HARQ instruction field indicates "001", terminal device 1 sends the corresponding HARQ-ACK in the 7th slot from the slot of the received PDSCH. If the received HARQ instruction field indicates "010", terminal device 1 transmits the corresponding HARQ-ACK in the 15th slot from the received PDSCH slot. If the received HARQ instruction field indicates "011", terminal device 1 transmits the corresponding HARQ-ACK in the 23rd slot from the received PDSCH slot.If the received HARQ instruction field indicates "100", terminal device 1 transmits the corresponding HARQ-ACK in the 31st slot from the received PDSCH slot. If the received HARQ instruction field indicates "101", terminal device 1 transmits the corresponding HARQ-ACK in the 39th slot from the received PDSCH slot. If the received HARQ instruction field indicates "110", terminal device 1 transmits the corresponding HARQ-ACK in the 47th slot from the received PDSCH slot. If the received HARQ instruction field indicates "111", terminal device 1 transmits the corresponding HARQ-ACK in the 55th slot from the received PDSCH slot.

[0207] If terminal device 1 is given the upper-layer parameter pdsch-AggregationFactor, then N PDSCH repeat This may be the value of pdsch-AggregationFactor. If the upper-layer parameter pdsch-AggregationFactor is not provided to terminal device 1, N PDSCH repeat It may be 1. Terminal device 1 has slot nN PDSCH repeat HARQ-ACK information for PDSCH reception from slot +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 indicator field included in the DCI format corresponding to the PDSCH reception. Alternatively, if the HARQ indicator field is not included in the DCI format, k may be given by the upper layer parameter dl-DataToUL-ACK.

[0208] If terminal device 1 is configured to monitor PDCCHs including DCI format 1_0 and not to monitor PDCCHs 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). If terminal device 1 is configured to monitor PDCCHs including DCI format 1_1, the HARQ-ACK timing value K1 may be given by the upper-layer parameter dl-DataToUL-ACK.

[0209] Terminal device 1 determines a set of multiple opportunities for one or more candidate PDSCH receptions to receive a PUCCH in a given slot, to which it transmits corresponding HARQ-ACK information. Terminal device 1 may determine multiple slots of slot timing K1 included in dl-DataToUL-ACK as multiple opportunities for candidate PDSCH receptions. K1 may be a set of k. For example, if dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), then at the PUCCH of slot n, HARQ-ACK information is transmitted for PDSCH receptions in slots n-1, n-2, n-3, n-4, n-5, n-6, n-7, and n-8. If terminal device 1 actually receives a PDSCH in the slot corresponding to candidate PDSCH reception, it sets ACK or NACK as HARQ-ACK information based on the transport block contained in that PDSCH. If it does not receive a PDSCH in the slot corresponding to candidate PDSCH reception, it sets NACK as HARQ-ACK information.

[0210] The HARQ indicator field in the DCI format received by the PDCCH of slot n-1 indicates 1. The HARQ indicator field in the DCI format received by the PDCCH of slot n-2 indicates 2. The HARQ indicator field in the DCI format received by the PDCCH of slot n-3 indicates 3. The HARQ indicator field in the DCI format received by the PDCCH of slot n-4 indicates 4. The HARQ indicator field in the DCI format received by the PDCCH of slot n-5 indicates 5. The HARQ indicator field in the DCI format received by the PDCCH of slot n-6 indicates 6. The HARQ indicator field in the DCI format received by the PDCCH of slot n-7 indicates 7. The HARQ indicator field in the DCI format received by the PDCCH of slot n-8 indicates 8.

[0211] Terminal device 1 determines, based on the slot that received the PDCCH and the value of the HARQ instruction field included in the received DCI format, which slot will send the HARQ-ACK information and which set of slots received multiple candidate PDSCHs corresponding to that HARQ-ACK information. For example, if dl-DataToUL-ACK is (1, 2, 3, 4, 5, 6, 7, 8), terminal device 1 receives the PDCCH in slot m and the HARQ instruction field included in the DCI format indicates 4. Terminal device 1 determines that it will send the HARQ-ACK information in slot (m+4). Terminal device 1 determines that the other HARQ-ACK information transmitted in slot (m+4) is the HARQ-ACK information for PDSCH reception in slot (m+(1-4)), the HARQ-ACK information for PDSCH reception in slot (m+(2-4)), the HARQ-ACK information for PDSCH reception in slot (m+(3-4)), the HARQ-ACK information for PDSCH reception in slot (m+(5-4)), the HARQ-ACK information for PDSCH reception in slot (m+(6-4)), the HARQ-ACK information for PDSCH reception in slot (m+(7-4)), and the HARQ-ACK information for PDSCH reception in slot (m+(8-4)).

[0212] In the above, we described the Semi-static HARQ-ACK codebook as one type of HARQ-ACK codebook, but other types of HARQ-ACK codebooks may also be used. We will now describe a type of HARQ-ACK codebook called the Dynamic HARQ-ACK codebook.

[0213] A HARQ-ACK codebook corresponding to a PDSCH group is given based on one or more HARQ-ACK bits corresponding to one or more transport blocks contained in one or more PDSCHs included in that PDSCH group. The HARQ-ACK codebook is given based on at least a set of Monitoring Occasions for PDCCH, some or all of the values ​​of the counter DAI field. The HARQ-ACK codebook may also be given based on the value of the UL DAI field, the HARQ-ACK codebook may also be given based on the value of the DAI field, or the HARQ-ACK codebook may also be given based on the value of the total DAI field.

[0214] The HARQ-ACK codebook size of a Dynamic HARQ-ACK codebook is based on the fields in 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 scheduled PDSCHs or transport blocks up to the receipt of the corresponding DCI format. The counter DAI field may also indicate the cumulative number of PDCCHs sent up to the receipt of the corresponding DCI format. The size of the HARQ-ACK codebook may also be set based on the value of the total DAI field in the DCI format. The total DAI field indicates the total number of PDSCHs or transport blocks scheduled up to the transmission of the HARQ-ACK codebook. The total DAI field may also indicate the total number of PDCCHs sent up to the transmission of the HARQ-ACK codebook.

[0215] Terminal device 1 may determine a set of PDCCH monitoring opportunities for HARQ-ACK information transmitted in a PUCCH located in slot #n of index n, based at least some or all of the value of timing K1 and slot offset K0. The set of PDCCH monitoring opportunities for HARQ-ACK information transmitted in a PUCCH located in slot #n of index n is also referred to as the set of PDCCH monitoring opportunities for slot #n. Here, the set of PDCCH monitoring opportunities includes M PDCCH monitoring opportunities. For example, slot offset K0 may be indicated based at least on the value of the time-domain resource allocation field included in the downlink DCI format. Slot offset K0 is a value indicating the number of slots (slot difference) from the slot containing the last OFDM symbol in which a PDCCH containing a DCI format containing the time-domain resource allocation field indicating the slot offset K0 is located, to the first OFDM symbol of the PDCCH scheduled by the DCI format.

[0216] If a DCI format detected during a monitoring opportunity in any search area set corresponding to a monitoring opportunity for a certain PDCCH triggers the transmission of HARQ-ACK information in slot n (including the triggering information), terminal device 1 may determine that the PDCCH monitoring opportunity is a PDCCH monitoring opportunity for slot n. Conversely, if a DCI format detected during a monitoring opportunity in a search area set corresponding to a PDCCH monitoring opportunity does not trigger the transmission of HARQ-ACK information in slot n (does not include the triggering information), terminal device 1 does not have to determine that the PDCCH monitoring opportunity is a PDCCH monitoring opportunity for slot n. Furthermore, if no DCI format is detected during a monitoring opportunity in a search area set corresponding to a PDCCH monitoring opportunity, terminal device 1 does not have to determine that the PDCCH monitoring opportunity is a PDCCH monitoring opportunity for slot n.

[0217] The PUCCH resource used to transmit HARQ-ACK information in slot n may be identified at least based on the PUCCH resource instruction field contained in the last of the one or more DCI formats found in the set of PDCCH monitoring opportunities for slot n, where each of the one or more DCI formats triggers the transmission of HARQ-ACK information in slot n. The last DCI format may be the DCI format corresponding to the last index (highest index) of the DCI formats found in the set of PDCCH monitoring opportunities for slot n. The indices of the DCI formats in the set of PDCCH monitoring opportunities for slot n are given in ascending order with respect to the index of the serving cell in which the DCI format is found, and then in ascending order with respect to the index of the PDCCH monitoring opportunity in which the DCI format is found. The indices of the PDCCH monitoring opportunities are given in ascending order on the time axis.

[0218] The Counter DAI (Counter DAI) indicates the cumulative number of PDCCHs detected up to the monitoring opportunity for a given PDCCH in a given serving cell, across M PDCCH monitoring opportunities. The Counter DAI may also be referred to as the C-DAI. The C-DAI corresponding to a PDSCH may be indicated by a field included in the DCI format used for scheduling the PDSCH. The Total DAI may indicate the cumulative number of PDCCHs detected up to monitoring opportunity m of a PDCCH across M PDCCH monitoring opportunities. The Total DAI may also be referred to as the T-DAI (Total Downlink Assignment Index).

[0219] Figure 7 shows an example of PDCCH monitoring based on the first control signal. Figure 7 shows nine slots (slot #0, slot #1, slot #2, slot #3, slot #4, slot #5, slot #6, slot #7, slot #8). Search area 2 (second search area) is configured in slots #0 and #8. Search area 1 (first search area) is configured in slots #6 and #7. Search area 2 is configured within the control resource set (second control resource set). Search area 1 is configured within the control resource set (first control resource set).

[0220] The base station device 3 configures search area 1 and search area 2 for the terminal device 1 and transmits RRC signaling containing information about the configured search area 1 and search area 2 to the terminal device 1. The terminal device 1 configures search area 1 and search area 2 based on the RRC signaling received from the base station device 3.

[0221] Terminal device 1 monitors PDCCH in search area 2 based on RRC signaling, not on the first control signal. Terminal device 1 monitors PDCCH in search area 1 based on the first control signal. Terminal device 1 monitors PDCCH in search area 2 in slot #0. Base station device 3 transmits PDCCH using PDCCH candidates in search area 2 and transmits PDSCH in slots #0, #1, #2, and #3. Terminal device 1 receives PDCCH in slot # and PDSCH in slots #0, #1, #2, and #3. As a result of monitoring PDCCH, terminal device 1 determines that PDCCH was transmitted from base station device 3 and receives PDCCH (reads the fields in DCI format). Terminal device 1 receives PDSCH based on the DCI format contained in PDCCH. Here, we show the case where the DCI format for multi-slot scheduling is used, and the resource allocation of four valid time domains is shown in DCI format.

[0222] Base station device 3 transmits a first control signal in slot #3. The first control signal is multiplexed with the PDSCH and placed in the same resource block as the PDSCH. The first control signal instructs monitoring of the PDCCH in the configured search area 1. Here, the first control signal may include information indicating whether or not to monitor the PDCCH in the search area 1. Here, the first control signal may include information indicating slot #6, and may include information indicating "3" as an offset value from slot #3. Here, the first control signal may include information indicating the number of the PDCCH candidate in the search area 1. Here, the first control signal may include information indicating the control channel element that constitutes the PDCCH candidate for which monitoring of the PDCCH is performed in the search area 1 (the absolute control channel element number, an offset from a certain reference number). Based on the first control signal, terminal device 1 performs monitoring of the PDCCH in the configured search area 1. If the first control signal instructs not to monitor the PDCCH in the search area 1, terminal device 1 performs monitoring of the PDCCH in the configured search area 1. Terminal device 1 may monitor PDCCH in the search area 1 configured in the slot indicated by the first control signal. Terminal device 1 may monitor PDCCH in the search area 1 configured closest in the time domain to the slot where the first control signal was received. Terminal device 1 may monitor PDCCH in the search area 1 configured closest in the time domain a certain period of time after the slot where the first control signal was received. If there are multiple search areas 1 between the slot where the first control signal was received and the next slot where search area 2 is configured, terminal device 1 may monitor PDCCH only in the first search area 1 and not in the search areas other than the first. If there are multiple search areas 1 between the slot where the first control signal was received and the next slot where search area 2 is configured, terminal device 1 may monitor PDCCH only in the search area 1 indicated by the first control signal and not in the search areas 1 indicated by the first control signal.

[0223] Base station device 3 transmits a PDCCH using PDCCH candidates in search area 1 of slot #6, and transmits a PDSCH in slot #6. Terminal device 1 receives a PDCCH in slot #6 and a PDSCH in slot #6. Terminal device 1 monitors the PDCCH and determines that it was transmitted from base station device 3, and receives the PDCCH (reads the fields in DCI format). Terminal device 1 receives the PDSCH based on the DCI format contained in the PDCCH.

[0224] In this way, the processing load on terminal device 1 related to PDCCH monitoring is reduced, while the flexibility of PDCCH scheduling by base station device 3 is improved. In Figure 7, if data to be transmitted to terminal device 1 is generated after base station device 3 has determined the contents of the DCI format contained in PDCCH in slot #0, base station device 3 does not need to wait until slot #8, and can transmit PDCCH and PDSCH in slot #6. By using search area 2 as the main search area and using search area 1 as a sub search area with the first control signal, the processing load on terminal device 1 related to PDCCH monitoring is reduced, while the flexibility of PDCCH scheduling by base station device 3 is improved.

[0225] In the second search area (search area 2), PDCCH monitoring is performed periodically in terminal device 1 based on a period configured by RRC signaling. In the first search area (search area 1), PDCCH monitoring is performed aperiodically in terminal device 1 triggered by the first control signal. Candidate slots for PDCCH monitoring are indicated by the configuration of the first search area.

[0226] If PDCCH monitoring is performed in the first search area, the number of PDCCH candidates that will be monitored (blind-decoded) in the next second search area may be reduced. An upper limit may be set, and within a certain period, monitoring (blind-decoding) may be performed on only a portion of the PDCCH candidates configured for the second search area, rather than all of them, so that the sum of the number of PDCCH candidates monitored (blind-decoded) in the first search area and the number of PDCCH candidates monitored (blind-decoded) in the second search area falls within the upper limit. In other words, monitoring (blind-decoded) may be performed on a number of PDCCH candidates that is less than the number of PDCCH candidates configured for the second search area. Without the base station device 3 additionally transmitting RRC signaling to the terminal device 1, and without the terminal device 1 receiving RRC signaling indicating a reduction in the PDCCH candidates in the second search area, the terminal device 1 may compare the upper limit with the number of PDCCH candidates and reduce the number of PDCCH candidates that will be monitored (blind-decoded) in the second search area.

[0227] As described above, one aspect of the present invention enables efficient transmission and reception of downlink control channels between the terminal device 1 and the base station device 3 while suppressing the processing load on the terminal device 1. By primarily monitoring PDCCH at multiple slot intervals, and by enabling the base station device 3 to instruct the terminal device 1 to monitor PDCCH as an auxiliary measure, the frequency utilization efficiency of resources can be improved.

[0228] The following describes various aspects of the apparatus according to one embodiment of this invention.

[0229] (1) To achieve the above objective, one aspect of the present invention employs the following means. That is, a first aspect of the present invention is a terminal device comprising a processor and a memory for storing computer program code, which performs an operation including receiving RRC signaling indicating the configuration of a first search area and a second search area, in which the search area configuration includes at least the number of PDCCH candidates for each period, offset, and aggregation level; configuring the first search area and the second search area based on the RRC signaling; monitoring the PDCCH in the second search area; receiving a first control signal multiplexed with a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH received in the second search area; and monitoring the PDCCH in the first search area if the first control signal includes information instructing the monitoring of the PDCCH in the first search area.

[0230] (2) A second aspect of the present invention is a base station device comprising a processor and a memory for storing computer program code, which performs an operation comprising: configuring a first search area and a second search area; transmitting RRC signaling indicating the configuration of the first search area and the second search area, wherein the configuration of the search area includes at least the number of PDCCH candidates for each period, offset, and aggregation level; transmitting a PDCCH in the second search area; transmitting a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH, and a first control signal multiplexed with the PDSCH; and transmitting a PDCCH in the first search area if the first control signal includes information instructing the monitoring of the PDCCH in the first search area.

[0231] (3) A third aspect of the present invention is a communication method used in a terminal device, comprising the steps of: receiving RRC signaling indicating the configuration of a first search area and a second search area, the configuration of a search area including at least the number of PDCCH candidates for each period, offset, and aggregation level; configuring the first search area and the second search area based on the RRC signaling; monitoring a PDCCH in the second search area; receiving a first control signal multiplexed with a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH received in the second search area; and, if the first control signal includes information instructing that PDCCH be monitored in the first search area, monitoring a PDCCH in the first search area.

[0232] (4) A fourth aspect of the present invention is a communication method used in a base station device, comprising the steps of: configuring a first search area and a second search area; transmitting an RRC signaling indicating the configuration of the first search area and the second search area, which includes at least the number of PDCCH candidates for each period, offset, and aggregation level; transmitting a PDCCH in the second search area; transmitting a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH; and a first control signal multiplexed with the PDSCH; and transmitting a PDCCH in the first search area if the first control signal includes information instructing that PDCCH monitoring be performed in the first search area.

[0233] A program operating in the base station apparatus 3 and the terminal apparatus 1 according to an aspect of the present invention may be a program (a program that causes a computer to function) that controls a CPU (Central Processing Unit) or the like so as to implement the functions of the above-described embodiment according to the aspect of the present invention. Information handled by these apparatuses is temporarily accumulated in a RAM (Random Access Memory) during processing, then stored in various ROMs such as a Flash ROM (Read Only Memory) or an HDD (Hard Disk Drive), and read, corrected and written by the CPU as necessary.

[0234] Furthermore, part of the terminal apparatus 1 and the base station apparatus 3 in the above-described embodiments may be implemented by a computer. In this case, the implementation may be achieved by recording a program for implementing the control functions described above on a computer-readable recording medium, causing a computer system to read and execute the program recorded in the recording medium.

[0235] Note that the "computer system" referred to herein is a computer system built into the terminal apparatus 1 or the base station apparatus 3, and includes hardware such as an operating system and peripheral devices. The "computer-readable recording medium" refers to portable media such as flexible disks, magneto-optical disks, ROMs, and CD-ROMs, and storage devices such as hard disks built into computer systems.

[0236] Furthermore, the "computer-readable recording medium" may also include those that dynamically hold the program for a short time, like communication lines when the program is transmitted via a network such as the Internet or a communication line such as a telephone line, and those that hold the program for a fixed period of time, like volatile memory inside computer systems acting as servers or clients in such cases. The above program may also be for implementing part of the functions described above, and may also be one that can implement the functions described above in combination with a program already recorded in a computer system.

[0237] The terminal device 1 may be configured to comprise at least one processor and at least one memory containing computer program instructions (a computer program). The memory and the computer program instructions (computer program) may be configured to, by using the processor, cause the terminal device 1 to perform the operations and processes described in the above embodiments. The base station device 3 may be configured to comprise at least one processor and at least one memory containing computer program instructions (a computer program). The memory and the computer program instructions (computer program) may be configured to, by using the processor, cause the base station device 3 to perform the operations and processes described in the above embodiments.

[0238] Further, the base station device 3 in the above-described embodiments can also be implemented as an aggregate (device group) configured from a plurality of devices. Each of the devices constituting the device group may comprise some or all of each function or each functional block of the base station device 3 related to the above-described embodiments. It is sufficient for the device group to have all the respective functions or respective functional blocks of the base station device 3. Further, the terminal device 1 related to the above-described embodiments can also communicate with the base station device as an aggregate.

[0239] Further, the base station device 3 in the above-described embodiments may be EUTRAN (Evolved Universal Terrestrial Radio Access Network) and / or NG-RAN (NextGen RAN, NR RAN). Further, the base station device 3 in the above-described embodiments may have some or all of the functions of an upper node for eNodeB and / or gNB.

[0240] Furthermore, some or all of the terminal device 1 and base station device 3 in the above-described embodiment may be implemented as LSIs, which are typically integrated circuits, or as a chipset. Each functional block of the terminal device 1 and base station device 3 may be individually chipped, or some or all of them may be integrated into a chip. In addition, the method of implementing the integrated circuit is not limited to LSIs; it may also be implemented using dedicated circuits or general-purpose processors. Moreover, if an integrated circuit technology that can replace LSIs emerges due to advances in semiconductor technology, it is also possible to use an integrated circuit based on that technology.

[0241] Furthermore, although the above-described embodiment mentions a terminal device as an example of a communication device, the present invention is not limited to this and can also be applied to stationary or non-movable electronic devices installed indoors or outdoors, such as terminal devices or communication devices for AV equipment, kitchen equipment, cleaning and washing machines, air conditioning equipment, office equipment, vending machines, and other household appliances.

[0242] While embodiments of this invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and design modifications and the like that do not depart from the gist of this invention are also included. Furthermore, various modifications are possible within the scope of the claims for one aspect of the present invention, 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 that produce similar effects are substituted for each other are also included. [Industrial applicability]

[0243] One aspect of the present invention can be used, for example, in communication systems, communication equipment (e.g., mobile phone devices, base station devices, wireless LAN devices, or sensor devices), integrated circuits (e.g., communication chips), or programs. [Explanation of Symbols]

[0244] 1 (1A, 1B, 1C) Terminal device 3 Base station equipment 10, 30 Wireless Transceiver Unit 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 Wireless Resource Control Layer Processing Unit

Claims

1. A terminal device comprising a processor and a memory for storing computer program code, which performs an operation including receiving RRC signaling indicating the configuration of a first search area and a second search area, the configuration of a search area including at least the number of PDCCH candidates for each period, offset, and aggregation level; configuring the first search area and the second search area based on the RRC signaling; monitoring the PDCCH in the second search area; receiving a first control signal multiplexed with a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH received in the second search area; the first control signal including information instructing the monitoring of the PDCCH in the first search area, and if there are multiple first search areas between the slot where the first control signal was received and the slot where the second search area is subsequently configured, monitoring the PDCCH only in the first first search area and not in the first first search area.

2. A base station device comprising a processor and a memory for storing computer program code, which performs an operation comprising: configuring a first search area and a second search area; transmitting RRC signaling indicating the configuration of the first search area and the second search area, wherein the configuration of the search area includes at least the number of PDCCH candidates for each period, offset, and aggregation level; transmitting a PDCCH in the second search area; transmitting a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH, and a first control signal multiplexed with the PDSCH; the first control signal including information instructing the monitoring of the PDCCH in the first search area, and if there are multiple first search areas between the slot to which the first control signal was transmitted and the next slot to which the second search area is configured, transmitting a PDCCH only in the first first search area and not in the first first search area.

3. A communication method used in a terminal device, comprising the steps of: receiving RRC signaling indicating the configuration of a first search area and a second search area, wherein the search area configuration includes at least the number of PDCCH candidates for each period, offset, and aggregation level; configuring the first search area and the second search area based on the RRC signaling; monitoring the PDCCH in the second search area; receiving a first control signal multiplexed with a PDSCH in which resource allocation is indicated in DCI format included in the PDCCH received in the second search area; and, if the first control signal includes information instructing the monitoring of the PDCCH in the first search area, and there are multiple first search areas between the slot where the first control signal was received and the slot where the second search area is subsequently configured, monitoring the PDCCH only in the first first search area and not in the first first search area.

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