Terminal, communication method, base station, and communication system

Abstract

A terminal comprising: a control unit which, when using an SCS, monitors a control channel in an area having a larger number of symbols than the number of symbols corresponding to smaller other SCSs than the SCS; and a reception unit for receiving control information by the control channel.

Description

[Technical Field]

[0001] The present invention relates to a terminal and a base station in a wireless communication system. [Background technology]

[0002] For NR (New Radio) (also known as "5G"), the successor system to LTE (Long Term Evolution), technologies are being considered that meet the requirements of a large-capacity system, high data transmission speeds, low latency, simultaneous connection of many terminals, low cost, and power saving. Furthermore, for NR, the use of high frequency bands such as 52.6 to 71 GHz or 24.25 to 71 GHz is being considered.

[0003] Furthermore, in order to expand frequency bands, existing LTE systems support the use of frequency bands (also called unlicensed bands, unlicensed carriers, or unlicensed CCs) that are different from frequency bands licensed to telecommunications carriers (operators) (licensed bands). Examples of unlicensed bands include the 2.4 GHz band, 5 GHz band, and 6 GHz band, which are capable of using Wi-Fi (registered trademark) or Bluetooth (registered trademark). In NR, a system that supports unlicensed bands is called an NR-U system. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 38.331 V15.8.0(2019-12) [Non-patent document 2] 3GPP TS 38.133 V16.1.0(2019-09) [Non-patent document 3] 3GPP TS 38.213 V16.1.0(2020-03) [Non-patent document 4] 3GPP TS 38.306 V16.1.0(2020-07) Summary of the Invention [Problem to be solved by the invention]

[0005] In NR, various functions are defined for the monitoring of control channels by terminals (for example, Non-Patent Documents 1 to 4).

[0006] However, devices that comply with existing regulations designed for frequency bands up to 52.6 GHz may not be able to properly monitor higher frequency bands than 52.6.

[0007] The present invention has been made in consideration of the above points, and aims to provide a technique that enables a terminal to appropriately monitor a control channel in a high frequency band in a wireless communication system. [Means for solving the problem]

[0008] According to the disclosed technology, a terminal using a second subcarrier spacing that is higher than a first subcarrier spacing, A transmitter that transmits predetermined terminal capability information related to PDCCH (Physical Downlink Control Channel) monitoring; a control unit that performs the PDCCH monitoring with the same number of PDCCH candidates as the maximum number of PDCCH candidates in the first subcarrier spacing; a receiving unit that receives downlink control information transmitted on the monitored PDCCH, The predetermined terminal capability information is the number of slots constituting a slot group in which the PDCCH monitoring is performed, and the number of downlink control information pieces that can be monitored by the PDCCH in the slot group, the number of slots constituting the slot group is a different value for each of the plurality of second subcarrier intervals, The length of the slot group is the same as one slot length in the first subcarrier spacing. , a terminal is provided. [Effects of the Invention]

[0009] The disclosed technology provides a technology that enables a terminal to appropriately monitor a control channel in a high frequency band in a wireless communication system. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 2] 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. [Figure 3] FIG. 10 is a diagram illustrating an example of a band. [Figure 4] FIG. 10 is a diagram illustrating an example of monitoring. [Figure 5] FIG. 10 is a diagram illustrating an example of monitoring. [Figure 6] FIG. 10 is a diagram illustrating an example of a span pattern. [Figure 7] FIG. 10 is a diagram illustrating an example of monitoring. [Figure 8] FIG. 1 is a diagram illustrating an example of a basic operation of the system. [Figure 9] FIG. 1 is a diagram illustrating an example of a basic operation of the system. [Figure 10] FIG. 1 is a diagram for explaining a first embodiment. [Figure 11] FIG. 1 is a diagram for explaining a first embodiment. [Figure 12] FIG. 1 is a diagram for explaining a first embodiment. [Figure 13] FIG. 1 is a diagram for explaining a first embodiment. [Figure 14] FIG. 1 is a diagram for explaining a first embodiment. [Figure 15] FIG. 10 is a diagram for explaining a second embodiment. [Figure 16] FIG. 10 is a diagram for explaining a second embodiment. [Figure 17] FIG. 10 is a diagram for explaining a second embodiment. [Figure 18] 2 is a diagram illustrating an example of a functional configuration of a base station 10 according to an embodiment of the present invention. [Figure 19] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal 20 according to the embodiment of the present invention. [Figure 20] 2 is a diagram illustrating an example of a hardware configuration of a base station 10 or a terminal 20 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0012] Existing technology is used as appropriate in the operation of the wireless communication system according to the embodiment of the present invention. The existing technology is, for example, the existing NR. The wireless communication system (base station 10 and terminal 20) according to the present embodiment basically operates in accordance with existing regulations. However, in order to solve the problems that arise when high frequency bands are used, the base station 10 and terminal 20 also perform operations that are not specified in the existing regulations. In the explanation of the embodiments described below, operations that are not specified in the existing regulations will be mainly explained. Note that all numerical values described below are examples.

[0013] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, Flexible Duplex, etc.).

[0014] Furthermore, in the embodiments of the present invention, when radio parameters and the like are "configured," it may mean that predetermined values are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0015] (System Configuration)

[0016] Fig. 1 is a diagram illustrating a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0017] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain.

[0018] OFDM is used as the radio access scheme. In the frequency domain, subcarrier spacing (SCS) of at least 15 kHz, 30 kHz, 120 kHz, and 240 kHz is supported. In this embodiment, larger SCSs are supported. Regardless of the SCS, a resource block is formed by a predetermined number (e.g., 12) of consecutive subcarriers.

[0019] When performing initial access, terminal 20 detects an SSB (SS / PBCH block) and identifies the SCS in the PDCCH and PDSCH based on the PBCH included in the SSB.

[0020] In the time domain, a slot is made up of multiple OFDM symbols (for example, 14 symbols regardless of the subcarrier spacing). Hereinafter, an OFDM symbol is called a "symbol." A slot is the scheduling unit. Subframes with a duration of 1 ms are defined, and a frame consisting of 10 subframes is defined. Note that the number of symbols per slot is not limited to 14.

[0021] As shown in Fig. 1, a base station 10 transmits control information or data to a terminal 20 in a DL (Downlink) and receives control information or data from the terminal 20 in an UL (Uplink). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals by performing beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via a SCell (Secondary Cell) and a PCell (Primary Cell) using CA (Carrier Aggregation).

[0022] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, an M2M (Machine-to-Machine) communication module, etc. As shown in Fig. 1, the terminal 20 receives control information or data from the base station 10 via DL and transmits control information or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system.

[0023] Fig. 2 shows an example of the configuration of a wireless communication system when NR-DC (NR-Dual connectivity) is implemented. As shown in Fig. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to a core network. The terminal 20 communicates with both the base station 10A and the base station 10B.

[0024] A cell group provided by base station 10A, which is an MN, is called an MCG (Master Cell Group), and a cell group provided by base station 10B, which is an SN, is called an SCG (Secondary Cell Group). The operation in this embodiment may be performed in either the configuration shown in FIG. 1 or FIG. 2.

[0025] In the wireless communication system according to the present embodiment, when an unlicensed band is used, LBT (Listen Before Talk) is executed. The base station 10 or the terminal 20 transmits when the LBT result is idle, and does not transmit when the LBT result is busy.

[0026] (Regarding frequency bands) Fig. 3 shows examples of frequency bands used in the existing NR and frequency bands used in the wireless communication system according to this embodiment. The existing NR has two frequency bands (which may also be referred to as frequency ranges): FR1 (0.41 GHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz). As shown in Fig. 3, FR1 supports SCSs of 15 kHz, 30 kHz, and 60 kHz, and a bandwidth (BW) of 5 to 100 MHz. FR2 supports SCSs of 60 kHz, 120 kHz, and 240 kHz (SSB only), and a bandwidth (BW) of 50 to 400 MHz.

[0027] The wireless communication system according to this embodiment is assumed to use the frequency band of 52.6 GHz to 71 GHz, which is not used in existing NR. For convenience, the frequency band of 52.6 GHz to 71 GHz is denoted as FR2x in Fig. 3. Furthermore, in this embodiment, the frequency band of 24.25 GHz to 71 GHz may be used as an extended FR2.

[0028] Furthermore, in this embodiment, as the frequency band is expanded as described above, an SCS wider than the existing SCS is used. For example, 480 kHz or an SCS wider than 480 kHz is used as the SCS for SSB and PDCCH / PDSCH. Note that, for example, an SCS of 480 kHz may be used for SSB, and an SCS of 240 kHz may be used for PDCCH / PDSCH.

[0029] (About the assignment) As described above, in this embodiment, an SCS (for example, 480 kHz) wider than the SCS of existing FR2 is used as the SCS in the frequency band of 52.6 GHz to 71 GHz or 24.25 GHz to 71 GHz.

[0030] In a wireless communication system such as NR, the terminal 20 performs data transmission and reception by receiving downlink control information (DCI) transmitted on a downlink control channel (specifically, a PDCCH) from the base station 10. For this reason, the terminal 20 monitors the downlink control channel.

[0031] Considering the trends in existing technologies (e.g., Tables 10.1-2 and 10.1-3) specified in Non-Patent Document 3 and the like, it is expected that the number of PDCCH candidates to be monitored by terminal 20, the maximum number of BDs (Blind Decoding), the maximum number of CCEs, etc. will be reduced as the SCS becomes larger due to limitations in terminal processing capabilities. In this case, a decrease in the number of CCEs will result in a decrease in AL (aggregation level), making it impossible to secure sufficient resources, leading to reduced reliability.

[0032] More specifically, for example, according to the description in Table 10.1-3 of the non-patent document, it is assumed that the maximum number of CCEs per slot monitored by terminal 20 is 16 when the SCS is 240 kHz (i.e., when μ = 4), and 1 or 2 when the SCS is 480 kHz (i.e., when μ = 5). Also, when the SCS becomes 960 kHz, it may not be possible to monitor even one PDCCH with a high AL per slot. Furthermore, when the SCS becomes larger, the types of DCI monitored within one slot are also limited.

[0033] In TR38.822 (hereinafter referred to as "Reference 1") or Non-Patent Document 4, the following capabilities are defined as conventional terminal capabilities.

[0034] (1) One monitoring opportunity per slot This is a mandatory function that must be provided without a capability signal, and is specified in FG3-1 of Reference 1. In other words, as shown in Fig. 4, terminal 20 must be able to monitor the PDCCH at least once per slot. Furthermore, the PDCCH monitoring period is 14 or more symbols, and the limits on the number of PDCCH candidates / CCEs / BDs are specified for each slot.

[0035] (2) Multiple monitoring opportunities per slot This is an optional function that requires capability signal transmission, and is specified in, for example, pdcchMonitoringAnyOccasionswithDCI-gap in Non-Patent Document 4 and FG3-5a in Reference Document 1. In other words, as shown in Fig. 5, terminal 20 monitors the PDCCH at multiple monitoring opportunities per slot.

[0036] (3) Span-level PDCCH monitoring This is an optional function that requires capability signaling, and is specified in Non-Patent Document 4, pdcchMonitoringAnyOccasionsWithSpanGap, and FG3-5b / 11-2 in Reference 1. More specifically, in Rel-15, the limit on the number of PDCCH candidates / CCEs / BDs is specified in slot units, and in Rel-16, the limit on the number of PDCCH candidates / CCEs / BDs is specified in span units for the combination of (X, Y).

[0037] Span-level PDCCH monitoring will be described with reference to Figure 6. As shown in Figure 6, one slot is divided into multiple time intervals (time separation), and within each time interval, there is a span, which is the time for monitoring the PDCCH. In (X, Y), the minimum value of one time interval (the interval between spans) is X symbols, and the maximum value of the span within the time interval is Y symbols. For example, (X, Y) is (2, 2), (4, 3), or (7, 3). Span-level PDCCH monitoring is specified for all SCSs in FG3-5b of Reference 1, and for 15 kHz and 30 kHz in 11-2. The configuration of spans in a slot is called a span pattern.

[0038] As already explained, in operation in the high frequency band above 52.6 GHz, it is expected that a larger SCS (for example, 480 kHz, 960 kHz) than FR1 / FR2 will be used, and accordingly the symbol length will be shortened.

[0039] In the terminal capability of the above-described existing technology, terminal 20 monitors the PDCCH once per slot. However, as shown in FIG. 7, as the SCS increases, the slot length shortens, which causes the frequency of PDCCH monitoring opportunities to become excessively high, resulting in increased load and power consumption on terminal 20. As a result, terminal 20 is unable to support mandatory capabilities. In other words, a terminal that complies with existing specifications assuming frequency bands up to 52.6 GHz may not be able to properly perform monitoring in frequency bands higher than 52.6 GHz.

[0040] The following describes a technique according to the present embodiment for solving the above problems.

[0041] (Outline of the embodiment) In this embodiment, the terminal capability for the downlink control channel may not be a mandatory capability as defined in FG3-1 of Reference 1. Specifically, the capabilities that terminal 20 should have will be described later as Examples 1 and 2. The outline is as follows.

[0042] The first embodiment is an embodiment regarding terminal capabilities for basic downlink control channels, and an example equivalent to the modification and extension of the provisions in FG3-1 of Reference 1 will be described.

[0043] Example 2 is an example of a PDCCH monitoring opportunity, and describes an example equivalent to the modification and extension of the provisions in FG3-5a, 3-5b, and 11-2 of Reference 1. More specifically, describes an example equivalent to the modification and extension of the provisions when the PDCCH monitoring opportunity is enabled for any OFDM symbol under a DCI gap. Also, describes an example equivalent to the modification and extension of the provisions when the PDCCH monitoring opportunity is enabled for any OFDM symbol under a span gap.

[0044] (Basic operation example) An example of a basic operation in this embodiment, which is common to Examples 1 and 2, will be described with reference to FIGS.

[0045] 8, the base station 10 transmits configuration information to the terminal 20. The configuration information may be transmitted by any of RRC signaling, MAC CE, and DCI.

[0046] A PDCCH is transmitted from the base station 10 (S102). In S103, the terminal 20 monitors the PDCCH based on the setting information received in S101. Note that the setting information from the base station 10 in S101 is not essential. The terminal 20 may monitor the PDCCH based on setting information stored in advance (for example, settings defined in a specification).

[0047] When the terminal 20 detects a PDCCH (DCI) addressed to itself through monitoring in S103, in S104, data transmission or data reception is performed based on the information specified in the DCI.

[0048] Fig. 9 shows an example of a case where capability information is notified. In S201 of Fig. 9, the terminal 20 transmits capability information (UE capability) to the base station 10. In S202, for example, the base station 10 transmits configuration information based on the capability information received in S201 to the terminal 20. The configuration information may be transmitted by any of RRC signaling, MAC CE, and DCI.

[0049] The PDCCH is transmitted from the base station 10 (S203). The base station 10 may determine the transmission resource, period, etc. of the PDCCH based on the capability information received in S201.

[0050] In S204, the terminal 20 monitors the PDCCH based on the setting information received in S202. Note that the setting information from the base station 10 in S202 is not essential. The terminal 20 may monitor the PDCCH based on setting information stored in advance.

[0051] When the terminal 20 detects a PDCCH (DCI) addressed to itself through monitoring in S204, in S205, data transmission or data reception is performed based on the information specified in the DCI.

[0052] (Capability information signaling) As described above, in this embodiment, terminal capabilities (functions) related to basic downlink control channels that are mandatory in existing technologies (e.g., FG3-1 in Reference 1) may not be mandatory. For this reason, in this embodiment (including Example 1 and Example 2), terminal 20 may notify (signal) capability information to base station 10 as shown in Option 1 to Option 3 below. Notification of capability information corresponds to S201 in Fig. 9.

[0053] <Option 1> When operating in a high frequency band of 52.6 GHz or higher, the terminal 20 reports to the base station 10 by incapability signaling functions that it cannot support among functions in existing specifications (for example, FG3-1 in Reference 1).

[0054] <Option 2> When operating in a high frequency band of 52.6 GHz or higher, the terminal 20 reports to the base station 10 capability information about new terminal capabilities (for example, capabilities described in the first and second embodiments).

[0055] <Option 3> A terminal 20 that operates in a high frequency band of 52.6 GHz or higher is provided with a new mandatory capability (for example, the capability described in the first and second embodiments) without capability signaling.

[0056] Example 1 Example 1 will be described below. In Example 1, it is assumed that terminal 20 receives signals in a high frequency band of 52.6 GHz or higher. Example 1-1, Example 1-2, Example 1-3, and Example 1-4 will be described below. Example 1-1, Example 1-2, Example 1-3, and Example 1-4 can be implemented in any combination.

[0057] <Example 1-1> In Example 1-1, an example regarding component (1) (One configured CORESET per BWP per cell in addition to CORESET0) in FG3-1 of Reference Document 1 will be described.

[0058] The terminal 20 of Example 1-1 basically has the function (capability) of component (1) in FG3-1 of Reference 1, but the functions described below are modified and expanded from component (1). However, this is an example, and the terminal 20 may have the functions described below regardless of component (1) in 3-1 of Reference 1.

[0059] In Example 1-1, terminal 20 can monitor a CORESET of 1 to 3 symbols or a number of symbols greater than 3 in a frequency band higher than 52.6 GHz. Note that CORESET is a time-frequency domain in which terminal 20 monitors the PDCCH.

[0060] The number of CORESET symbols that can be monitored may be determined according to the SCS. For example, in the example shown in Fig. 10, when the downlink SCS is 120 kHz, the terminal 20 can monitor CORESET with a number of symbols ranging from 1 to 3. When the downlink SCS is 480 kHz, the terminal 20 can monitor CORESET with a number of symbols ranging from 1 to 4. When the downlink SCS is 960 kHz, the terminal 20 can monitor CORESET with a number of symbols ranging from 1 to 5.

[0061] For example, in the sequence described in Fig. 8, terminal 20 receives configuration information including the number of CORESET symbols that terminal 20 should monitor from base station 10. If SCS = 480 kHz, the configuration information specifies, for example, the number of symbols = 4.

[0062] The base station 10 transmits the PDCCH (DCI) within the range of the CORESET of four symbols. In S103, the terminal 20 monitors the PDCCH within the area of the CORESET of four symbols.

[0063] Furthermore, capability information may be notified as in the sequence described in Fig. 9. That is, as shown in Fig. 9, in S201, terminal 20 notifies base station 10 of the (maximum) number of CORESET symbols that can be monitored as capability information. For example, when SCS = 480 kHz, terminal 20 notifies base station 10 of 4 as the number of CORESET symbols that can be monitored.

[0064] As a result, the base station 10 can know that the maximum number of CORESET symbols that the terminal 20 can monitor is 4, and so in S202, for example, the number of CORESET symbols is set to 4 (S202), and PDCCH transmission is performed within the range of the number of symbols = 4 (S203). Alternatively, PDCCH transmission may be performed in S203 without performing the setting in S202.

[0065] As described above, by increasing the number of symbols in CORESET, terminal 20 can appropriately monitor the PDCCH even if the symbol length becomes shorter as the SCS increases.

[0066] Increasing the number of CORESET symbols as the SCS increases is an example. The frequency width of CORESET may be increased as the SCS increases. Furthermore, the period of CORESET in the search space may be decreased as the SCS increases.

[0067] <Example 1-2> In Example 1-2, an example regarding component (2) (CSS and UE-SS configurations for unicast PDCCH transmission per BWP per cell) in FG3-1 of Reference Document 1 will be described.

[0068] The terminal 20 of Example 1-2 basically has the function (capability) of component (2) in FG3-1 of Reference Document 1, but the functions described below are modified and expanded from component (2). However, this is an example, and the terminal 20 may have the functions described below regardless of component (2) in FG3-1 of Reference Document 1.

[0069] Example 1-2 can be divided into Example 1-2-1 and Example 1-2-2, and each will be explained below.

[0070] <Example 1-2-1> In Example 1-2-1, in frequency bands higher than 52.6 GHz, terminal 20 performs PDCCH monitoring assuming an aggregation level (AL) of at most 16. AL is the number of control channel elements (CCEs) assigned to the monitored PDCCH. In other words, terminal 20 only needs to have the capability to monitor PDCCHs with AL=N (N is a number smaller than 16).

[0071] For example, when the SCS is 120 kHz, the terminal 20 monitors the PDCCH assuming that the maximum AL is 16. When the SCS is 480 kHz, the terminal 20 monitors the PDCCH assuming that the maximum AL is 8. When the SCS is 960 kHz, the terminal 20 monitors the PDCCH assuming that the maximum AL is 4.

[0072] For example, in the sequence described in Fig. 8, terminal 20 receives configuration information including the maximum value of AL of PDCCH that terminal 20 should monitor from base station 10. If SCS = 480 kHz, for example, AL = 8 is specified by the configuration information.

[0073] The base station 10 transmits PDCCH (DCI) within the range of AL=8. In S103, the terminal 20 performs monitoring assuming PDCCH up to AL=8. For example, monitoring is performed assuming AL=4 and AL=8.

[0074] Furthermore, capability information may be notified as in the sequence described in Fig. 9. That is, as shown in Fig. 9, in S201, terminal 20 notifies base station 10 of the maximum value of AL that can be monitored as capability information. For example, when SCS = 480 kHz, terminal 20 notifies base station 10 of 8 as the maximum value of AL that can be monitored.

[0075] As a result, the base station 10 can know that the maximum value of AL that the terminal 20 can monitor is 8, and therefore transmits a PDCCH created within the range of AL=8 in S202 (S203). Alternatively, the PDCCH may be transmitted in S203 without performing the setting in S202.

[0076] As described above, by limiting AL to a value smaller than 16, terminal 20 can efficiently monitor the PDCCH in frequency bands higher than 52.6 GHz.

[0077] <Example 1-2-2> In Example 1-2-2, in frequency bands higher than 52.6 GHz, the number of symbols in a PDCCH monitoring opportunity and the position of the PDCCH monitoring opportunity for terminal 20 are not limited to specific ones. For example, the PDCCH monitoring opportunity may be one or more symbols in the center of a slot, or one or more symbols at the boundary between two slots in a slot group (a set of two or more slots).

[0078] Fig. 11 shows an example of PDCCH monitoring opportunities for terminal 20. In the example of Fig. 11, when SCS = 120 kHz, terminal 20 performs PDCCH monitoring using one or more symbols in the center of a slot. When SCS = 480 kHz, terminal 20 performs PDCCH monitoring using one or more symbols at the boundary between two slots (across two slots) in a slot group consisting of four slots. When SCS = 960 kHz, terminal 20 performs PDCCH monitoring using one or more symbols at the boundary between two slots (across two slots) in a slot group consisting of eight slots.

[0079] For example, in the sequence described in Fig. 8, the terminal 20 receives, from the base station 10, configuration information of PDCCH monitoring opportunities by the terminal 20. This configuration information may include, for example, any one or more or all of the number of symbols per PDCCH monitoring opportunity, the period of the PDCCH monitoring opportunity, and the position of the PDCCH monitoring opportunity (the center of a slot, the boundary between two slots, etc.).

[0080] The base station 10 may transmit the PDCCH addressed to the terminal 20 at the PDCCH monitoring opportunity. In S103, the terminal 20 performs monitoring at the monitoring opportunity set in S101.

[0081] Furthermore, capability information may be notified as in the sequence described in Fig. 9. For example, in S201, terminal 20 notifies base station 10 as capability information any one, any plurality, or all of the number of symbols per PDCCH monitoring opportunity, the period of PDCCH monitoring opportunity, and the position of PDCCH monitoring opportunity (center of slot, boundary between two slots, etc.) that terminal 20 supports.

[0082] This allows the base station 10 to ascertain PDCCH monitoring opportunities that can be monitored by the terminal 20, and therefore allows the base station 10 to perform settings in S202 that take into account the PDCCH monitoring opportunities. Alternatively, the base station 10 may perform PDCCH transmission in S203 without performing the settings in S202.

[0083] As described above, any number of symbols and positions can be set as PDCCH monitoring opportunities, so even if the symbol length becomes shorter as the SCS increases, terminal 20 can appropriately monitor the PDCCH.

[0084] <Examples 1-3> In Example 1-3, an example regarding component (4) (Number of PDCCH blind decodes per slot with a given SCS follows Case 1-1 table) in FG3-1 of Reference Document 1 will be described.

[0085] The terminal 20 in Example 1-3 basically has the function (capability) of component (4) in FG3-1 of Reference 1, but the functions described below are modified and expanded from component (4). However, this is an example, and the terminal 20 may have the functions described below regardless of component (4) in 3-1 of Reference 1.

[0086] In Examples 1-3, when terminal 20 uses an SCS greater than SCS=120 kHz in a frequency band higher than 52.6 GHz, it may perform PDCCH monitoring with a maximum number of BDs equal to or less than the number of BDs (which may also be referred to as the number of PDCCH candidates) specified for SCS=120 kHz.

[0087] The maximum number of BDs applied by terminal 20 may be the number per slot, the number per subslot, the number per slot group, the number per subframe, or the number per other unit. Note that a subslot is a unit of time length smaller than one slot, and a subframe is a unit of time length smaller than one frame.

[0088] The unit in which the maximum number of BDs is applied may be determined by specifications, or may be set by the base station 10 to the terminal 20 in configuration information.

[0089] 12 or 13 may be specified in a specification or the like, and terminal 20 may perform monitoring with the maximum number of BDs specified in this table. Also, base station 10 may notify terminal 20 of setting information for the maximum number of BDs specified in the table shown in Fig. 12 or 13, and terminal 20 may perform monitoring with the maximum number of BDs specified in the setting information. Furthermore, if terminal 20 has the capability for the maximum number of BDs specified in the table shown in Fig. 12 or 13, terminal 20 may notify base station 10 of the maximum number of BDs as capability information.

[0090] 12 and 13 show an example of the maximum number of BDs per SCS per slot group. In the example of Fig. 12, the same 20 BDs as for μ=3 (SCS=120 kHz) is also specified for μ=4, 5, and 6 (SCS=240, 480, and 960 kHz).

[0091] In the example of FIG. 13, the number of BDs at μ=4, 5, and 6 (SCS=240, 480, and 960 kHz) is set to 18, 16, and 14, which is smaller than the number of BDs at μ=3 (SCS=120 kHz), that is, 20, respectively.

[0092] For example, in the sequence described in Fig. 8, terminal 20 receives configuration information from base station 10, including the maximum number of BDs that terminal 20 should apply to monitoring. If SCS = 480 kHz, the configuration information specifies, for example, the number of BDs per slot group = 16. The configuration information may also specify the number of slots in one slot group.

[0093] The base station 10 transmits the PDCCH (DCI). In S103, the terminal 20 monitors the PDCCH with the maximum number of BDs=16 based on, for example, the setting information.

[0094] Furthermore, capability information may be notified as in the sequence described in Fig. 9. That is, as shown in Fig. 9, in S201, terminal 20 notifies base station 10 of the maximum number of BDs (and units such as slot groups) that it supports as capability information.

[0095] As a result, the base station 10 can grasp the maximum number of BDs that the terminal 20 can monitor, and therefore, in S202, for example, sets the maximum number of BDs (S202) and performs PDCCH transmission (S203). Alternatively, PDCCH transmission may be performed in S203 without performing the setting in S202.

[0096] As described above, by reducing the maximum number of BDs and adjusting the unit, terminal 20 can appropriately monitor the PDCCH even if the symbol length or slot length becomes shorter as the SCS increases.

[0097] <Examples 1-4> In Example 1-4, an example will be described regarding component (5) (Processing one unicast DCI scheduling DL and one unicast DCI scheduling UL per slot per scheduled CC for FDD) and component (6) (Processing one unicast DCI scheduling DL and two unicast DCI scheduling UL per slot per scheduled CC for TDD) in FG3-1 of Reference Document 1.

[0098] The terminal 20 in Example 1-4 basically has the functions (capabilities) of components (5) and (6) in FG3-1 of Reference Document 1, but the functions described below have been modified and expanded from components (5) and (6). However, this is just an example, and the terminal 20 may have the functions described below regardless of components (5) and (6) in 3-1 of Reference Document 1.

[0099] In Examples 1-4, the maximum number of DCIs that the terminal 20 can process per scheduled CC, per slot, per symbol group, per subslot, per slot group, per subframe, or per span in the combination (X, Y) is determined. The DCI is, for example, but not limited to, DCI for unicast DL or UL scheduling. The number of DCIs may also be determined separately for TDD and FDD.

[0100] The maximum number of DCIs that can be processed may be determined in specifications for each unit (slot, symbol group, subslot, slot group, subframe, span, etc.), or may be set by configuration information from base station 10 to terminal 20. Terminal 20 may also notify base station 10 of the maximum number of DCIs that can be processed, together with the unit (slot, symbol group, subslot, slot group, subframe, span, etc.), as capability information.

[0101] Furthermore, the information of the above units (for example, the number of slots constituting a slot group) may be defined in specifications for each SCS, or may be set by configuration information from base station 10 to terminal 20. Furthermore, terminal 20 may notify base station 10 of the information of the units (for example, the number of slots constituting a slot group that terminal 20 can support) as capability information.

[0102] Fig. 14 is a diagram showing an example of a slot group as the above-mentioned unit. In the example of Fig. 14, the slot groups are defined so that the length of one slot group when SCS = 480 kHz and 960 kHz is the same as the length of one slot when SCS = 120 kHz.

[0103] 8, terminal 20 receives from base station 10 the maximum number of DCIs to be processed by terminal 20, the unit of the number of DCIs, and configuration information including information about the unit. If SCS=480 kHz, the configuration information specifies, for example, a slot group of 4 slots and a number of DCIs per slot group of 3.

[0104] The base station 10 transmits a PDCCH (DCI). In S103, the terminal 20 processes the DCI with the number of DCIs per slot group set to 3, for example, based on the setting information. Processing the DCI means, for example, decoding the DCI and reading the DCI information.

[0105] Furthermore, capability information may be notified as in the sequence described in Fig. 9. That is, as shown in Fig. 9, in S201, terminal 20 notifies base station 10 of the maximum number of DCIs that it supports and the unit of that number as capability information.

[0106] As a result, base station 10 can ascertain the maximum number of DCIs that terminal 20 can process, and so in S202, for example, sets the maximum number of DCIs (S202) and performs PDCCH transmission (S203). Alternatively, PDCCH transmission may be performed in S203 without setting in S202.

[0107] Also, as an example, in TDD (or FDD), the terminal 20 may be able to process a maximum of one DCI per slot group of one CC. The terminal 20 may notify the base station 10 of this capability, or the capability may be defined in a specification or the like, and the terminal 20 may operate in accordance with the specification.

[0108] As described above, the maximum number of DCIs that terminal 20 can process can be determined not only in slot units but also in slot group units, for example. Therefore, even if the symbol length or slot length becomes shorter as the SCS increases, terminal 20 can process DCI appropriately.

[0109] <Other examples of Example 1> The operations described in Examples 1-1 and 1-2 may be defined for each type of search space (for example, CSS, USS) or for each SCS.

[0110] Furthermore, the notification of capability information from the terminal 20 to the base station 10 described in Examples 1-1 and 1-2 may be performed for each function described in Examples 1-1 and 1-2, or all of the functions described in Examples 1-1 and 1-2 may be notified together in one capability information notification. This also applies to Examples 2-1 to 2-4 described later.

[0111] Example 2 Example 2 will be described below. In Example 2, the terminal 20 also receives signals in a high frequency band of 52.6 GHz or higher. Examples 2-1, 2-2, 2-3, and 2-4 will be described below. Examples 2-1, 2-2, 2-3, and 2-4 can be implemented in any combination.

[0112] In the second embodiment, an example relating to FG3-5a, 3-5b, and 11-2 in Reference Document 1 will be described. The terminal 20 in the second embodiment basically has the functions (capabilities) of FG3-5a, 3-5b, and 11-2 in Reference Document 1, but the functions described below are modified and expanded versions of FG3-5a, 3-5b, and 11-2 in Reference Document 1. However, this is just an example, and the terminal 20 may have the functions described below regardless of FG3-5a, 3-5b, and 11-2 in Reference Document 1.

[0113] <Example 2-1> In Example 2-1, a PDCCH monitoring occasion in the terminal 20 can be one or more symbols at any position in a slot group. A time interval (DCI gap, time interval between two DCIs) is provided between one PDCCH monitoring occasion and the next PDCCH monitoring occasion.

[0114] In particular, in Example 2-1, when an SCS greater than 120 kHz is used, the minimum value of the time interval (DCI gap) is set in the terminal 20. The unit of the minimum value is not limited to a specific one, and may be, for example, a symbol, a subslot, a slot, or a subframe.

[0115] The minimum value of the time interval in terminal 20 is defined in specifications and the like together with its unit, and does not have to be notified to base station 10 as capability information supported by terminal 20. In addition, the minimum value of the time interval in terminal 20 may be notified to base station 10 together with its unit as capability information supported by terminal 20.

[0116] As an example, the minimum value of the time interval may be 11 symbols when SCS=120 kHz, 16 symbols when SCS=480 kHz, and 21 symbols when SCS=960 kHz.

[0117] An example of the minimum time interval between PDCCH monitoring opportunities is shown in Figure 15. In the example of Figure 15, one block in each SCS represents one slot. Also, one slot group for SCS = 480 kHz = 2 slots, and one slot group for SCS = 960 kHz = 4 slots.

[0118] In the example of FIG. 15, when SCS=120 kHz, the minimum time interval is 1 slot, and when SCS=480 kHz or 960 kHz, the minimum time interval is 1 slot group.

[0119] Furthermore, as described in Example 1-2, the PDCCH monitoring opportunity may straddle a slot boundary.

[0120] For example, in the sequence described in Fig. 8, terminal 20 receives configuration information including information on the time interval and its unit to be applied in monitoring by terminal 20 from base station 10. This time interval is equal to or greater than the minimum time interval described above.

[0121] The base station 10 may transmit the PDCCH (DCI) at, for example, a time interval set in the terminal 20. In S103, the terminal 20 performs PDCCH monitoring at, for example, a time interval specified in the setting information.

[0122] Furthermore, capability information may be reported as in the sequence described in Fig. 9. That is, as shown in Fig. 9, in S201, terminal 20 reports the minimum time interval and its unit that it supports to base station 10 as capability information. This time interval is, for example, the value of the minimum time interval described above.

[0123] As a result, the base station 10 can ascertain the minimum time interval that the terminal 20 can monitor, and so in S202, the base station 10 sets the time interval to a value equal to or greater than the minimum time interval (S202) and performs PDCCH transmission (S203). Alternatively, the base station 10 may perform PDCCH transmission in S203 without performing the setting in S202.

[0124] As described above, the time interval for monitoring that terminal 20 can perform can be determined not only in slot units but also in slot group units, for example. Therefore, even if the symbol length becomes shorter as the SCS increases, terminal 20 can perform PDCCH monitoring processing appropriately.

[0125] <Example 2-2> Example 2-2 is based on Example 2-1. However, Example 2-2 does not necessarily have to be based on Example 2-1. The unit (time unit) for limiting the processing of the PDCCH in terminal 20 can be not only a slot but also a slot group or a subframe.

[0126] For example, as described in Example 1-3, when terminal 20 uses an SCS greater than SCS=120 kHz in a frequency band higher than 52.6 GHz, it may perform PDCCH monitoring with a maximum number of BDs equal to or smaller than the number of BDs (which may also be referred to as the number of PDCCH candidates) specified for SCS=120 kHz. Specifically, the values shown in Figures 12 and 13 in Example 1-3 may be applied.

[0127] Also, for example, the table shown in Fig. 16 may be specified in a specification or the like, and terminal 20 may perform monitoring with the maximum number of CCEs per slot group in accordance with the provisions of this table. Also, base station 10 may notify terminal 20 of setting information for the maximum number of CCEs in accordance with the table shown in Fig. 16, and terminal 20 may perform monitoring with the maximum number of CCEs in accordance with the setting information. Also, if terminal 20 has the capability of the maximum number of CCEs in accordance with the table shown in Fig. 16, terminal 20 may notify base station 10 of the maximum number of CCEs as capability information.

[0128] As an example, Fig. 16 shows the maximum number of CCEs per SCS per slot group. In the example of Fig. 16, the number of CCEs is specified as 32 when μ=3 (SCS=120 kHz), 16 when μ=4 (SCS=240 kHz), 16 when μ=5 (SCS=480 kHz), and 16 when μ=6 (SCS=960 kHz).

[0129] Not limited to the above example, the monitoring limit value may be notified from the terminal 20 to the base station 10 as capability information, or may be set from the base station 10 to the terminal 20 by RRC signaling (which may be MAC CE or DCI), or may be specified in a specification, etc.

[0130] For example, in the sequence described in FIG. 8, terminal 20 receives from base station 10 configuration information including limit values (e.g., maximum number of BDs, maximum number of CCEs) that terminal 20 should apply in monitoring and information on their units.

[0131] The base station 10 transmits the PDCCH (DCI). In S103, the terminal 20 performs PDCCH monitoring within a range of limit values specified in the setting information, for example.

[0132] Furthermore, capability information may be notified as in the sequence described in Fig. 9. That is, as shown in Fig. 9, in S201, terminal 20 notifies base station 10 of the capability of the limit value that it supports and its unit as capability information.

[0133] As a result, the base station 10 performs setting in S202 (S202) and performs PDCCH transmission (S203) in consideration of the limit value applicable to the terminal 20. Alternatively, the base station 10 may perform PDCCH transmission in S203 without performing the setting in S202.

[0134] As described above, the limit value for PDCCH monitoring in terminal 20 can be set to a value not only per slot but also per slot group, for example. Therefore, even if the symbol length becomes shorter as the SCS increases, terminal 20 can perform PDCCH monitoring processing appropriately.

[0135] <Other Examples in Examples 2-1 and 2-2> The operations described in Examples 2-1 and 2-2 may be defined for each type of search space (for example, CSS, USS) or for each SCS.

[0136] <Example 2-3> In Example 2-3, a PDCCH monitoring opportunity in terminal 20 can be one or more symbols at any position in a slot (or a slot group). A time interval (which may be called a span gap or span interval) is provided between one PDCCH monitoring opportunity (also called a span here) and the next PDCCH monitoring opportunity (span). The method of using spans is as described with reference to FIG. 6. The span gap (span interval) between span A and span B is the time interval from the start of span A to the start of span B.

[0137] In particular, in Example 2-3, when an SCS greater than 120 kHz is used, a minimum value X of the time interval (span gap) and a span length Y are set in terminal 20. The unit of the minimum value X is not limited to a particular one, but may be, for example, a symbol. In this case, the number of symbols X is set as the minimum value. Furthermore, the unit of the span length is not limited to a particular one, but may be, for example, a symbol. In this case, the number of symbols (number of consecutive symbols) Y is set as the span length.

[0138] The above is an example, and the units of X and Y may be subslots, slots, or subframes in addition to symbols. The span may also cross slot boundaries.

[0139] X and Y in terminal 20 are defined in specifications and the like together with their units, and do not have to be notified to base station 10 as capability information supported by terminal 20. Furthermore, X and Y in terminal 20 may be notified to base station 10 together with their units as capability information supported by terminal 20.

[0140] As an example, (X,Y) in symbol units may be any of (8,8), (16,12), or (28,12) when SCS=480 kHz, and any of (16,16), (32,24), or (56,24) when SCS=960 kHz.

[0141] In the span pattern shown in Fig. 6, it is determined in units of one slot, but in Example 2-3, the span pattern may be defined in units of a subslot, a slot, a slot group, a subframe, or a frame, and may be repeated in that unit. Fig. 17 shows an example in which a span pattern is determined in units of a slot group.

[0142] For example, in the sequence described in Fig. 8, terminal 20 receives from base station 10 configuration information including information on (X, Y) and the span pattern that terminal 20 should apply in monitoring. Note that (X, Y) may be included in the span pattern information. Also, if a predetermined span pattern is used, the span pattern information does not need to be included.

[0143] The base station 10 transmits the PDCCH (DCI) taking into consideration, for example, (X, Y) set in the terminal 20. In S103, the terminal 20 performs PDCCH monitoring with, for example, (X, Y) specified in the setting information.

[0144] Furthermore, capability information may be notified as in the sequence described in Fig. 9. That is, as shown in Fig. 9, in S201, terminal 20 transmits capability information including information on (X, Y) and span patterns that it supports. Note that (X, Y) may be included in the span pattern information. Furthermore, when a predetermined span pattern is used, the capability information does not need to include information on the span pattern.

[0145] As a result, the base station 10 can grasp information about the span that the terminal 20 can monitor, and so in S202, for example, performs settings within the range that the terminal 20 can support (S202), and performs PDCCH transmission (S203). Alternatively, PDCCH transmission may be performed in S203 without performing the settings in S202.

[0146] As described above, it is now possible for terminal 20 to use longer values for the monitoring span or span gap that it can perform than before, so even if the symbol length becomes shorter as the SCS increases, terminal 20 can perform PDCCH monitoring processing appropriately.

[0147] It is just an example that the terminal 20 uses a longer value than conventionally as the span or span gap of monitoring that can be performed. Depending on the unit selected for the span or span gap, it is also possible to use a shorter value than conventionally as the span Y or span gap X.

[0148] <Example 2-4> Example 2-4 is based on Example 2-3. However, Example 2-4 may not be based on Example 2-3. The unit (time unit) for limiting the processing of the PDCCH in terminal 20 may be not only a slot but also a slot group, a subframe, or a span in (X, Y).

[0149] For example, as described in Example 1-3, when terminal 20 uses an SCS greater than SCS=120 kHz in a frequency band higher than 52.6 GHz, it may perform PDCCH monitoring with a maximum number of BDs equal to or smaller than the number of BDs (which may also be referred to as the number of PDCCH candidates) specified for SCS=120 kHz. Specifically, the values shown in Figures 12 and 13 in Example 1-3 may be applied.

[0150] Also, for example, the table shown in Fig. 16 may be specified in a specification or the like, and terminal 20 may perform monitoring with the maximum number of CCEs per slot group in accordance with the provisions of this table. Setting information for the maximum number of CCEs in accordance with the table shown in Fig. 16 may be notified from base station 10 to terminal 20, and terminal 20 may perform monitoring with the maximum number of CCEs in accordance with the setting information. Also, if terminal 20 has the capability of the maximum number of CCEs in accordance with the table shown in Fig. 16, terminal 20 may notify base station 10 of the maximum number of BDs as capability information. The contents of Fig. 16 are as described in Example 2-3.

[0151] Not limited to the above example, the monitoring limit value may be notified from the terminal 20 to the base station 10 as capability information, or may be set from the base station 10 to the terminal 20 by RRC signaling (which may be MAC CE, DCI), or may be specified in a specification, etc.

[0152] For example, in the sequence described in FIG. 8, terminal 20 receives from base station 10 configuration information including limit values (e.g., maximum number of BDs, maximum number of CCEs) that terminal 20 should apply in monitoring and information on their units.

[0153] The base station 10 transmits the PDCCH (DCI). In S103, the terminal 20 performs PDCCH monitoring within a range of limit values specified in the setting information, for example.

[0154] Furthermore, capability information may be notified as in the sequence described in Fig. 9. That is, as shown in Fig. 9, in S201, terminal 20 notifies base station 10 of the capability of the limit value that it supports and its unit as capability information.

[0155] As a result, the base station 10 performs setting in S202 (S202) and performs PDCCH transmission (S203) in consideration of the limit value applicable to the terminal 20. Alternatively, the base station 10 may perform PDCCH transmission in S203 without performing the setting in S202.

[0156] As described above, the limit value for PDCCH monitoring in terminal 20 can be set to a value not only per slot but also per slot group, for example. Therefore, even if the symbol length becomes shorter as the SCS increases, terminal 20 can perform PDCCH monitoring processing appropriately.

[0157] <Other Examples in Examples 2-3 and 2-4> The operations described in Examples 2-3 and 2-4 may be defined for each type of search space (for example, CSS, USS) or for each SCS.

[0158] (Other examples common to Examples 1 and 2) Any of the functions (capabilities) of the terminal 20 described in the first and second embodiments may be applied only to the common search space (CSS), may be applied only to the UE-specific search space (USS), or may be applied to both the common search space (CSS) and the UE-specific search space (USS). Also, the base station 10 may set in the terminal 20 which type of search space and which type of function are to be applied.

[0159] Furthermore, the control channel to be monitored by the terminal 20 is not limited to the downlink control channel (PDCCH), but may be, for example, a sidelink control channel (PSCCH), a downlink feedback channel, or a sidelink feedback channel.

[0160] (Device configuration) Next, an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above will be described.

[0161] <Base station 10> Fig. 18 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 18, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Fig. 18 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations according to the embodiment of the present invention. Furthermore, the transmitting unit 110 and the receiving unit 120 may be collectively referred to as a communication unit.

[0162] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of a higher layer from the received signals. The transmitter 110 also has a function of transmitting, to the terminal 20, an NR-PSS, an NR-SSS, an NR-PBCH, a DL / UL control signal, DCI via a PDCCH, data via a PDSCH, and the like.

[0163] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device provided in the setting unit 130, and reads out the information from the storage device as needed.

[0164] The control unit 140 schedules DL reception or UL transmission of the terminal 20 via the transmission unit 110. The control unit 140 also includes a function for performing LBT. The functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120. The transmission unit 110 may also be called a transmitter, and the reception unit 120 may also be called a receiver.

[0165] <Terminal 20> Fig. 19 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 19, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Fig. 19 is merely an example. As long as the operations related to the embodiment of the present invention can be performed, the names of the functional divisions and functional units may be any. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

[0166] The transmitter 210 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. The receiver 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, DCI via PDCCH, data via PDSCH, and the like transmitted from the base station 10. For example, the transmitter 210 may transmit a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), a PSBCH (Physical Sidelink Broadcast Channel), and the like to another terminal 20 as D2D communication, and the receiver 120 may receive the PSCCH, PSSCH, PSDCH, PSBCH, and the like from the other terminal 20.

[0167] The setting unit 230 stores various setting information received from the base station 10 or other terminals by the receiving unit 220 in a storage device provided in the setting unit 230, and reads the information from the storage device as needed. The setting unit 230 also stores setting information that is set in advance.

[0168] The control unit 240 controls the terminal 20. The control unit 240 also performs the monitoring control described in the first and second embodiments. The control unit 240 also includes a function for performing LBT. The functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220. The transmitting unit 210 may also be called a transmitter, and the receiving unit 220 may also be called a receiver.

[0169] <Summary> This embodiment provides at least the terminals and base stations shown in the following items 1 to 6. (Section 1) a control unit that, when using a certain SCS, monitors a control channel in an area with a larger number of symbols than the number of symbols corresponding to other SCSs smaller than the certain SCS; a receiving unit that receives control information via the control channel; A terminal comprising: (Section 2) The control unit performs the monitoring at the center of a slot or at the boundary between two slots. 1. The terminal described in paragraph 1. (Section 3) a control unit that monitors the control channel at a time interval equal to or greater than a certain minimum value when an SCS larger than a certain SCS is used; a receiving unit that receives control information via the control channel; A terminal comprising: (Section 4) a control unit that, when using a second SCS that is larger than a first SCS, monitors a control channel using a span with a larger number of symbols than the number of symbols of a span corresponding to the first SCS and a span interval with a larger number of symbols than the number of symbols of a span interval corresponding to the first SCS; a receiving unit that receives control information via the control channel; A terminal comprising: (Section 5) When a certain SCS is used, the control unit performs the monitoring within a range of a limit value that is the same as or smaller than a limit value corresponding to another SCS that is smaller than the certain SCS. A terminal according to any one of paragraphs 1 to 4. (Section 6) a receiving unit that, when using a certain SCS, receives capability information from a terminal regarding an ability to monitor a control channel in an area having a larger number of symbols than the number of symbols corresponding to another SCS smaller than the certain SCS; a transmitting unit that transmits setting information to the terminal based on the capability information; A base station comprising:

[0170] Any of the first to sixth paragraphs provides a technique that enables a terminal to appropriately monitor a control channel in a high frequency band in a wireless communication system. In particular, the second paragraph allows flexible setting of the time position of the monitoring opportunity, thereby enabling appropriate monitoring. The fifth paragraph allows application of a relaxed limit value when the SCS becomes large, thereby enabling appropriate monitoring.

[0171] (Hardware configuration) The block diagrams (FIGS. 18 and 19) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0172] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocation, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0173] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 20 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0174] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0175] Each function in the base station 10 and the terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0176] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0177] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 18 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 19 may be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0178] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0179] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0180] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0181] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0182] Furthermore, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0183] Furthermore, base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

[0184] (Supplementary explanation of the embodiment) Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, unless otherwise specified, these numerical values are merely examples, and any appropriate values may be used. The division of items in the above description is not essential to the present invention; two or more items may be combined as needed, and items described in one item may apply to items described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

[0185] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0186] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0187] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0188] In this specification, a specific operation that is described as being performed by the base station 10 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0189] The information or signals described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0190] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be sent to another device.

[0191] In the present disclosure, the determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0192] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0193] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0194] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0195] Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0196] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0197] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0198] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0199] In this disclosure, terms such as "base station (BS)," "radio base station," "base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0200] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a part or the entire coverage area of a base station and / or base station subsystem that provides communication service within this coverage.

[0201] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0202] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0203] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile body, or the mobile body itself. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0204] Furthermore, a base station in the present disclosure may be read as a terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a terminal is replaced with communication between a plurality of terminals 20 (which may be called, for example, D2D (Device-to-Device) or V2X (Vehicle-to-Everything)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0205] Similarly, the term "terminal" in the present disclosure may be read as "base station." In this case, the base station may be configured to have the functions of the terminal described above.

[0206] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0207] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0208] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0209] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0210] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0211] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0212] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0213] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0214] Numerology may be communication parameters that apply to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, and specific windowing operations performed by the transceiver in the time domain.

[0215] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0216] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0217] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0218] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, or the like instead of a subframe. Furthermore, one slot may be called a unit time. The unit time may differ for each cell depending on the numerology.

[0219] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0220] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0221] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0222] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0223] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0224] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0225] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0226] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0227] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0228] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0229] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0230] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0231] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0232] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0233] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0234] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0235] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0236] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device

Claims

1. A terminal using a second subcarrier spacing higher than the first subcarrier spacing, A transmitter that transmits predetermined terminal capability information related to PDCCH (Physical Downlink Control Channel) monitoring; a control unit that performs the PDCCH monitoring with the same number of PDCCH candidates as the maximum number of PDCCH candidates in the first subcarrier spacing; a receiving unit for receiving downlink control information transmitted on the monitored PDCCH, The predetermined terminal capability information is the number of slots constituting a slot group in which the PDCCH monitoring is performed and the number of downlink control information pieces that can be monitored by the PDCCH in the slot group, the number of slots constituting the slot group is a different value for each of the plurality of second subcarrier intervals, A terminal, wherein the length of the slot group is the same as one slot length in the first subcarrier spacing.

2. the number of pieces of downlink control information is determined for each of time division duplex and frequency division duplex, The terminal according to claim 1 , wherein the downlink control information is information for scheduling a unicast downlink or uplink.

3. 1. A communication method performed by a terminal using a second subcarrier spacing higher than a first subcarrier spacing, comprising: Transmitting predetermined terminal capability information related to PDCCH (Physical Downlink Control Channel) monitoring; performing the PDCCH monitoring with a number of PDCCH candidates equal to a maximum number of PDCCH candidates in the first subcarrier spacing; receiving downlink control information transmitted on the monitored PDCCH; The predetermined terminal capability information is the number of slots constituting a slot group in which the PDCCH monitoring is performed and the number of downlink control information pieces that can be monitored by the PDCCH in the slot group, the number of slots constituting the slot group is a different value for each of the plurality of second subcarrier intervals, A communication method, wherein the length of the slot group is the same as one slot length in the first subcarrier spacing.

4. a base station using a second subcarrier spacing higher than the first subcarrier spacing, A receiving unit that receives predetermined terminal capability information related to PDCCH (Physical Downlink Control Channel) monitoring from a terminal; a control unit that assumes that the terminal performs the PDCCH monitoring with a number of PDCCH candidates that is the same as a maximum number of PDCCH candidates in the first subcarrier spacing; a transmitter that transmits, to the terminal, downlink control information to be transmitted on the monitored PDCCH; The predetermined terminal capability information is the number of slots constituting a slot group in which the PDCCH monitoring is performed and the number of downlink control information pieces that can be monitored by the PDCCH in the slot group, the number of slots constituting the slot group is a different value for each of the plurality of second subcarrier intervals, A base station, wherein the length of the slot group is the same as the length of one slot in the first subcarrier spacing.

5. 1. A communication system including a terminal and a base station using a second subcarrier spacing higher than a first subcarrier spacing, The terminal A transmitter that transmits predetermined terminal capability information related to PDCCH (Physical Downlink Control Channel) monitoring to the base station; a control unit that performs the PDCCH monitoring with the same number of PDCCH candidates as the maximum number of PDCCH candidates in the first subcarrier spacing; a receiving unit that receives downlink control information transmitted on the monitored PDCCH from the base station, The predetermined terminal capability information is the number of slots constituting a slot group in which the PDCCH monitoring is performed and the number of downlink control information pieces that can be monitored by the PDCCH in the slot group, the number of slots constituting the slot group is a different value for each of the plurality of second subcarrier intervals, The length of the slot group is equal to one slot length in the first subcarrier spacing, The base station a receiving unit that receives the predetermined terminal capability information from the terminal; a control unit that assumes that the terminal performs the PDCCH monitoring with a number of PDCCH candidates that is the same as a maximum number of PDCCH candidates in the first subcarrier spacing; a transmitting unit that transmits the downlink control information to the terminal.

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