Terminal and communication method

Abstract

To provide a terminal and a communication method for applying semi-persistent scheduling to a non-terrestrial network.SOLUTION: In a wireless communication system, a terminal includes a control unit that controls activation of SPS (Semi-PersistentScheduling), and a transmission unit that transmits, to a base station, feedback information always indicating a specific value for reception of a first SPSPDSCH after the activation when disabling of feedback corresponding to a PDSCH (PhysicalDownlinkSharedChannel) is set in the terminal.SELECTED DRAWING: Figure 17

Description

[Technical Field]

[0001] The present invention relates to a terminal and a communication method 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 that satisfy requirements such as a large-capacity system, high-speed data transmission speed, low latency, simultaneous connection of a large number of terminals, low cost, and low power consumption are being considered (for example, Non-Patent Document 1).

[0003] Currently, NTN (Non-Terrestrial Network) is being considered, which uses non-terrestrial networks such as satellites to provide services to areas that cannot be covered by terrestrial 5G networks, mainly due to cost.

[0004] NR Release 17 considers technologies for performing time or frequency synchronization based on satellite orbits. For example, a terminal receives satellite orbit data from a base station. Based on the satellite orbit data and location information acquired by a Global Navigation Satellite System (GNSS), the terminal can calculate a value indicating a timing advance for a service link and perform pre- or post-correction of Doppler shift for frequency correction.

[0005] In addition, in NR, semi-persistent scheduling (SPS) to reduce downlink overhead is being studied following on from LTE. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] 3GPP TS 38.300 V16.6.0(2021-06) [Non-patent document 2] 3GPP TS 38.213 V16.6.0(2021-06) Summary of the Invention [Problem to be solved by the invention]

[0007] If the semi-persistent scheduling being considered in NR is used in a non-terrestrial network, the HARQ response from the terminal to an instruction such as DCI to start scheduling will be delayed, which will result in a problem in that it is unclear whether the instruction has reached the terminal, resulting in the downlink data subsequently sent to the terminal being wasted.

[0008] The present invention has been made in view of the above points, and has as its object to provide a technique that enables semi-persistent scheduling to be applied to non-terrestrial networks. [Means for solving the problem]

[0009] According to the disclosed technology, there is provided a terminal including: a control unit that controls activation of SPS (Semi-Persistent Scheduling); and a transmission unit that, when the terminal is configured to disable feedback corresponding to PDSCH (Physical Downlink Shared Channel), transmits feedback information that always indicates a specific value to a base station in response to reception of the first SPS PDSCH after the activation. [Effects of the Invention]

[0010] The disclosed technology provides a technique that allows semi-persistent scheduling to be applied to non-terrestrial networks. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a first diagram for explaining a non-terrestrial network. [Figure 2] FIG. 2 is a second diagram for explaining a non-terrestrial network. [Figure 3] FIG. 10 is a third diagram for explaining a non-terrestrial network. [Figure 4] FIG. 4 is a fourth diagram for explaining a non-terrestrial network. [Figure 5] FIG. 1 is a first diagram for explaining the disabling of HARQ feedback. [Figure 6] FIG. 10 is a second diagram for explaining the disabling of HARQ feedback. [Figure 7] FIG. 1 is a diagram for explaining semi-permanent scheduling in a conventional terrestrial network. [Figure 8] FIG. 1 is a diagram for explaining the problems that arise when applying conventional semi-persistent scheduling to a non-terrestrial network. [Figure 9] FIG. 10 is a diagram for explaining semi-permanent scheduling according to Example 1-1. [Figure 10] FIG. 10 is a diagram for explaining semi-permanent scheduling according to Example 1-2. [Figure 11] FIG. 10 is a diagram for explaining semi-permanent scheduling according to Example 2-1. [Figure 12] FIG. 10 is a diagram for explaining semi-permanent scheduling according to Example 2-2. [Figure 13] FIG. 10 is a diagram illustrating semi-permanent scheduling according to a third embodiment. [Figure 14] FIG. 10 is a diagram illustrating semi-permanent scheduling according to a fourth embodiment. [Figure 15] FIG. 10 is a diagram illustrating semi-permanent scheduling according to a fifth embodiment. [Figure 16] FIG. 2 is a diagram illustrating an example of a functional configuration of a base station according to an embodiment of the present invention. [Figure 17] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal according to an embodiment of the present invention. [Figure 18] FIG. 2 is a diagram illustrating an example of a hardware configuration of a base station or a terminal according to an embodiment of the present invention. [Figure 19] 1 is a diagram showing an example of a configuration of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] 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.

[0013] In operation of the wireless communication system according to the embodiment of the present invention, existing technologies may be used as appropriate. The existing technologies include, but are not limited to, existing NR or LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems subsequent to LTE-Advanced (e.g., NR) unless otherwise specified.

[0014] Furthermore, in the embodiments of the present invention described below, terms used in existing LTE, such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), and PUSCH (Physical Uplink Shared Channel), are used. This is for convenience of description, and similar signals, functions, etc. may be referred to by other names. Furthermore, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even signals used in NR are not necessarily designated as "NR-".

[0015] 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.).

[0016] Furthermore, in the embodiments of the present invention, "configuring" radio parameters and the like may mean that predetermined values ​​are pre-configured, or that radio parameters notified from a base station or a terminal are set.

[0017] Figure 1 is the first diagram for explaining a non-terrestrial network. A non-terrestrial network (NTN) uses non-terrestrial devices such as satellites to provide services to areas that cannot be covered by a terrestrial 5G network, mainly due to cost reasons. NTN can also provide more reliable services. For example, it is expected to be applied to IoT (Internet of Things), ships, buses, trains, and critical communications. NTN also has scalability through efficient multicast or broadcast.

[0018] As an example of an NTN, as shown in FIG. 1, a satellite 10A can retransmit signals transmitted from a terrestrial base station 10B to provide service to areas where no terrestrial base stations are located, such as mountainous regions.

[0019] The terrestrial 5G network may have the following configuration. The terrestrial 5G network includes one or more base stations 10 and terminals 20. The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminals 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain, and the time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits a synchronization signal and system information to the terminals 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, on NR-PBCH, and is also called broadcast information.

[0020] The base station 10 transmits control signals or data to the terminal 20 via DL (Downlink) and receives control signals or data from the terminal 20 via 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 an SCell (Secondary Cell) and a PCell (Primary Cell) using CA (Carrier Aggregation).

[0021] 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. The terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system.

[0022] FIG. 2 is a second diagram for explaining a non-terrestrial network. The area of ​​each cell or beam in an NTN is much larger than that of a terrestrial network (TN). FIG. 2 shows an example of an NTN configured with retransmission by satellite. The connection between the satellite 10A and the NTN gateway 10B is called a feeder link, and the connection between the satellite 10A and the UE 20 is called a service link.

[0023] As shown in Figure 2, the difference in delay between UE 20A on the near side and UE 20B on the far side is, for example, 10.3 ms in the case of GEO (Geosynchronous orbit) and 3.2 ms in the case of LEO (Low Earth orbit). Also, the beam size in NTN is, for example, 3500 km in the case of GEO and 1000 km in the case of LEO.

[0024] FIG. 3 is a third diagram for explaining a non-terrestrial network. As shown in FIG. 3, the NTN is realized by a satellite in space or a flying object in the air. For example, a GEO satellite may be a satellite located at an altitude of 35,786 km and having a geostationary orbit. For example, a LEO satellite may be a satellite located at an altitude of 500-2000 km and orbiting every 88-127 minutes. For example, a HAPS (High Altitude Platform Station) may be a flying object located at an altitude of 8-50 km and performing circular flight.

[0025] As shown in Figure 3, GEO satellites, LEO satellites, and HAPS aircraft may be connected to ground stations (gNBs) via gateways. The service areas may be larger in the order of HAPS, LEO, and GEO.

[0026] For example, NTN can extend the coverage of a 5G network to unserved or served areas. Furthermore, NTN can improve the continuity, availability, and reliability of services on ships, buses, trains, or other critical communications. The NTN may be signaled by transmitting dedicated parameters to the terminal 20, and the dedicated parameters may be parameters related to determining a timing advance (TA) based on information related to a satellite or an aircraft.

[0027] FIG. 4 is a fourth diagram for explaining a non-terrestrial network. FIG. 4 shows an example of an NTN network architecture assumed for a transparent payload. As shown in FIG. 4, a CN (Core Network) 10D, a gNB 10C, and a gateway 10B are connected. The gateway 10B is connected to a satellite 10A via a feeder link. The satellite 10A is connected to a terminal 20A or a VSAT (Very Small Aperture Terminal) 20B via a service link. An NR Uu is established between the gNB 10C and the terminal 20A or the VSAT 20B.

[0028] NTN's network architecture may be FDD or TDD. Terrestrial cells may be fixed or mobile. Terminal 20 may have GNSS (Global Navigation Satellite System) capabilities. For example, a power class 3 handheld device may be assumed in FR1. A VSAT device may be assumed at least in FR2.

[0029] NTN's network architecture may also assume regenerative payloads. For example, gNB functionality may be mounted on a satellite or air vehicle. Alternatively, a gNB-DU may be mounted on a satellite or air vehicle, and a gNB-CU may be deployed as a ground station.

[0030] In NTN, it is necessary to consider long propagation delays, mobility of LEOs or HAPS, and communication via GEOs, LEOs, or HAPS. To address these NTN characteristics, enhancements to HARQ operation are being considered. For example, HARQ feedback may be disabled. When HARQ feedback is disabled, two consecutive DL transport blocks can be transmitted in one HARQ process without waiting for feedback.

[0031] Figure 5 is a first diagram for explaining the disabling of HARQ feedback. The HARQ feedback to be disabled is configured for each HARQ process via terminal-specific RRC signaling. Disabling is applied when a long waiting time is not desirable due to long propagation delay. It is necessary to ensure time for processing the PDSCH.

[0032] Figure 6 is a second diagram for explaining HARQ feedback disablement. Figure 6 shows the mechanism of HARQ-ACK CB type 2. C-DAI / T-DAI is the number of processes for which feedback is enabled. The CB size is determined based only on the feedback-enabled processes.

[0033] 7 is a diagram for explaining semi-persistent scheduling in a conventional terrestrial network. In the terrestrial network of NR Release 15 / 16, a semi-persistent scheduling (SPS) technique is supported.

[0034] The activation DCI allocates PDSCH reception and indicates activation of SPS. That is, the base station 10 transmits the activation DCI to the terminal 20 as a notification to start semi-persistent scheduling.

[0035] The HARQ response corresponding to the PDSCH reception accompanying the SPS activation is used to confirm that the activation was successful. Subsequent SPS-PDSCHs without corresponding PDCCHs are transmitted in the same time interval.

[0036] The release DCI indicates the release of the SPS without the allocation of a PDSCH. That is, the base station 10 transmits the release DCI to the terminal 20 as a notification that the semi-persistent scheduling is terminated. The HARQ response corresponding to the release DCI is used to confirm that the release has been successful.

[0037] The HARQ process number for each PDSCH reception is determined based on the slot index and higher layer parameters to define the number of HPNs allocated to the SPS as follows:

[0038] HARQProcessID=[floor(CURRENT_slot×10 / (numberOfSlotsPerFrame×periodicity))] modulo nrofHARQ-Processes or,

[0039] HARQProcessID=[floor(CURRENT_slot×10 / (numberOfSlotsPerFrame×periodicity))] modulo nrofHARQ-Processes+harq-ProcID-Offset

[0040] Here, CURRENT_slot=[(SFN×numberOfSlotsPerFrame)+slot number within a frame], where numberOfSlotsPerFrame indicates the number of consecutive slots per frame.

[0041] Figure 8 illustrates the problem of applying conventional semi-persistent scheduling to non-terrestrial networks. In non-terrestrial networks, propagation delays are very large. That is, a fairly large TA is expected. Also, the range of the scheduling offset value K1 (the slot offset from the PDSCH to the corresponding PUCCH) is not very wide, so a slot offset K_offset is added to the legacy offset K1.

[0042] In this case, the timing of receiving the HARQ response corresponding to the PDSCH associated with the activation DCI becomes significantly late. If a small periodicity is used for the SPS, many SPS-PDSCHs without a subsequent PDCCH need to be transmitted before the base station 10 receives the HARQ response (called HARQ-ACK X) corresponding to the PDSCH associated with the activation DCI.

[0043] 1. However, the activation DCI may be lost (terminal 20 fails to receive it), in which case the subsequent SPS-PDSCH resources will be wasted.

[0044] 2. Furthermore, if the activation DCI is correctly received by the terminal 20 but the HARQ-ACK X is not received by the base station 10, the terminal 20 transmits many HARQ responses corresponding to subsequent SPS-PDSCHs before the HARQ-ACK X is received by the base station 10. However, the base station 10 does not acknowledge the transmissions.

[0045] This means that since the presence of the HARQ response is unclear in the base station 10, it is difficult for the base station 10 to schedule a PUSCH that overlaps with the PUCCH of the HARQ response.

[0046] (Outline of this embodiment) In this embodiment, a technique for applying semi-persistent scheduling to a non-terrestrial network will be described. A terminal 20 determines the timing to receive downlink data to which semi-persistent scheduling is applied based on the timing of transmitting feedback corresponding to the notification of the start of semi-persistent scheduling. Hereinafter, examples 1 to 5 will be described as specific examples.

[0047] Example 1 In this embodiment, an example will be described in which SPS-PDSCH reception starts after transmission of a HARQ response corresponding to an activation DCI.

[0048] In the following description, the transmission timing does not include TA. In the following description, slot n indicates the index of the reception slot of the Activation DCI or the index of the reception slot of the PDSCH associated with the Activation DCI.

[0049] (Example 1-1) 9 is a diagram illustrating semi-persistent scheduling according to Example 1-1. Terminal 20 receives the first PDSCH in slot n+(K1+K_offset)+K0. That is, K0 in the activation DCI is the slot offset between the PUCCH and the first SPS-PDSCH.

[0050] The terminal 20 treats the first SPS-PDSCH as an SPS-PDSCH reception without a corresponding PDCCH and determines the PUCCH resource for the corresponding HARQ response according to the same mechanism as for subsequent PDSCH receptions. That is, the base station 10 notifies the terminal 20 of the slot offset between the SPS-PDSCH and the PUCCH via the activation DCI. The PUCCH resource is provided by the RRC parameter (n1PUCCH-AN) of the SPS-Config (not provided by the activation DCI).

[0051] According to Example 1-1, the problem of wasting SPS-PDSCH resources is solved. After the terminal 20 confirms that the SPS activation is successful, the terminal 20 can start receiving the SPS-PDSCH.

[0052] (Example 1-2) 10 is a diagram illustrating semi-persistent scheduling according to Example 1-2. Terminal 20 receives the first PDSCH in slot n+K0+K_offset. That is, K_offset is applied to SPS-PDSCH resource allocation and PUCCH / PUSCH slot indication.

[0053] Terminal 20 assumes that the first SPS-PDSCH reception is allocated after PUCCH with or without a specified processing time (time gap), i.e., K0 >= K1 + (processing time between PUCCH / PUSCH and PDSCH at slot level), or K0 >= K1.

[0054] As in Example 1-1, terminal 20 treats the first SPS-PDSCH as an SPS-PDSCH reception without a corresponding PDCCH and determines the PUCCH resource for the corresponding HARQ response according to the same mechanism as for subsequent PDSCH reception. That is, base station 10 notifies terminal 20 of the slot offset between the SPS-PDSCH and the PUCCH via activation DCI. In addition, the PUCCH resource is provided by the RRC parameter (n1PUCCH-AN) of SPS-Config (not provided by activation DCI).

[0055] According to the embodiment 1-2, the problem of wasting SPS-PDSCH resources is solved. After the terminal 20 confirms that the SPS activation is successful, the terminal 20 can start receiving the SPS-PDSCH.

[0056] Example 2 In this embodiment, an example is shown in which the terminal 20 receives the second SPS-PDSCH after activation after the slot or symbol of the PUCCH transmission corresponding to the activation.

[0057] In the following description, the transmission timing does not include TA. In the following description, slot n indicates the index of the reception slot of the Activation DCI or the index of the reception slot of the PDSCH associated with the Activation DCI.

[0058] Example 2-1 11 is a diagram for explaining semi-persistent scheduling according to Example 2-1. A given slot offset is applied between the reception of the first SPS-PDSCH and the reception of the second SPS-PDSCH. That is, terminal 20 receives the second SPS-PDSCH in slot n+ (given slot offset).

[0059] The given slot offset may be provided by, for example, a configured RRC parameter, or may be determined based on K_offset. For example, the given slot offset may be K_offset+SPS period.

[0060] According to the embodiment 2-1, the problem of wasting SPS-PDSCH resources is solved, the reception of many SPS-PDSCHs before confirming successful activation can be avoided, and the implementation of the terminal 20 is simple.

[0061] (Example 2-2) 12 is a diagram for explaining semi-permanent scheduling according to Example 2-2. It is assumed that a period greater than K_offset+K1 is set for SPS in the terminal 20.

[0062] Terminal 20 may treat the reception of a second SPS-PDSCH before the slot or symbol of the PUCCH transmission corresponding to the activation DCI as an error case.

[0063] According to the embodiment 2-2, the problem of SPS-PDSCH resources being wasted does not occur, and the implementation of the terminal 20 is simple.

[0064] Example 3 In this embodiment, an example is shown in which the terminal 20 skips monitoring reception of the designated SPS-PDSCH before transmitting a HARQ response corresponding to an activation DCI.

[0065] 13 is a diagram illustrating semi-permanent scheduling according to the third embodiment. Note that the transmission timing in the following description does not include TA.

[0066] Upon receiving the SPS activation DCI, terminal 20 does not start monitoring the SPS-PDSCH without the corresponding PDCCH until a time after slot n+K_offset+K0+K1 (and / or +(the processing time between the PUCCH / PUSCH and the PDSCH)). Also, terminal 20 may not transmit a HARQ response corresponding to the SPS-PDSCH that was not monitored, and may transmit a NACK instead.

[0067] <Option 1> For a conventional first SPS-PDSCH scheduled by an activation DCI (or an SPS-PDSCH with an associated scheduling DCI), terminal 20 may monitor the first SPS-PDSCH and feed back the positive or negative of the first SPS-PDSCH in slot n+K_offset+K0+K1.

[0068] <Option 2> For a conventional initial SPS-PDSCH scheduled by an activation DCI (or an SPS-PDSCH with an associated scheduling DCI), terminal 20 may not monitor the initial SPS-PDSCH and may feed back an acknowledgment for the activation DCI in slot n+K_offset+K0+K1.

[0069] (Relationship between disabling HARQ responses and SPS) Also, HARQ response disabling may be used in conjunction with SPS, in which case HARQ feedback may still be enabled for activation / release.

[0070] That is, the following conditions may be satisfied: ·HARQ feedback for SPS-enabled HPN is disabled. HARQ feedback corresponding to activation DCI is performed regardless of the setting.

[0071] Here, there is a problem that it is unclear how to generate a HARQ response bit corresponding to the activation DCI. Note that, if feedback is available, the terminal 20 may generate a HARQ response bit based on the initial SPS-PDSCH.

[0072] Example 4 In this embodiment, if the HARQ process corresponding to the first SPS-PDSCH (i.e., the SPS-PDSCH associated with the activation DCI) is set to disable feedback, the terminal 20 determines to transmit a HARQ response corresponding to the activation DCI regardless of the decoding result of the first SPS-PDSCH.

[0073] 14 is a diagram illustrating semi-persistent scheduling according to embodiment 4. In the following description, slot n indicates the index of the reception slot of the activation DCI.

[0074] The HARQ response information is always specific information (for example, ACK), and the feedback slot is determined based on the reception slot of the activation DCI (ie, not the first SPS-PDSCH reception).

[0075] For example, terminal 20 receives activation DCI in slot n and transmits the corresponding PUCCH in slot n+K_offset+K1.

[0076] According to the fourth embodiment, the terminal 20 does not need to wait for the first SPS-PDSCH to be decoded in order to generate the HARQ response bit.

[0077] Example 5 In this embodiment, when the HARQ process corresponding to the first SPS-PDSCH (i.e., the SPS-PDSCH associated with the activation DCI) is set to disable feedback, the terminal 20 determines to transmit a HARQ response corresponding to the activation DCI based on the decoding result of the first SPS-PDSCH.

[0078] 15 is a diagram illustrating semi-persistent scheduling according to embodiment 5. In the following description, slot n indicates the index of the reception slot of the activation DCI.

[0079] At least one of the feedback slot and the PUCCH resource is notified to the terminal 20 by the activation DCI.

[0080] The HARQ response information is either ACK or NACK. That is, if the decoding of the first SPS-PDSCH is successful, it is ACK, and if it is unsuccessful, it is NACK. Terminal 20 determines the feedback slot based on the reception slot of the first SPS-PDSCH.

[0081] For example, terminal 20 receives the first SPS-PDSCH in slot n, and then transmits the corresponding PUCCH in slot n+K_offset+K1.

[0082] According to embodiment 5, retransmission based on HARQ feedback can be applied to SPS-PDSCH. It should be noted that this function is more beneficial when the period is large, since there is enough time for retransmission.

[0083] (Device configuration) Next, a description will be given of an example of the functional configuration of the base station 10 and the terminal 20 that execute the processes and operations described above. The base station 10 and the terminal 20 include functions for executing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only the functions proposed in any of the embodiments.

[0084] <Base station 10> Fig. 16 is a diagram showing an example of the functional configuration of the base station 10. As shown in Fig. 16, 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. 16 is merely an example. The names of the functional divisions and functional units may be any as long as they can perform the operations related to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called a communication unit.

[0085] 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 signal. The transmitter 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. The transmitter 110 also transmits the setting information, etc., described in the embodiments.

[0086] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads out the information from the storage device as needed. The control unit 140 performs, for example, overall control of the base station 10, including control related to signal transmission and reception. Note that the functional unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the receiving unit 120. Furthermore, the transmitting unit 110 and the receiving unit 120 may be called a transmitter and a receiver, respectively.

[0087] <Terminal 20> Fig. 17 is a diagram showing an example of the functional configuration of the terminal 20. As shown in Fig. 17, 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. 17 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called a communication unit.

[0088] The transmitter 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiver 220 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The transmitter 210 also transmits HARQ-ACK, and the receiver 220 receives the setting information and the like described in the embodiments.

[0089] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device, and reads it out from the storage device as needed. The setting unit 230 also stores setting information that is set in advance. The control unit 240 performs overall control of the terminal 20, including control related to signal transmission and reception. Note that 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 and the receiving unit 220 may also be called a transmitter and a receiver, respectively.

[0090] The terminal or base station of this embodiment may be configured as a terminal or base station shown in each of the following items. Also, the following communication method may be implemented.

[0091] <Configuration of this embodiment> (Section 1) a control unit for controlling activation of the SPS; When the terminal is set to disable feedback corresponding to PDSCH, a transmitter transmits feedback information to a base station, the feedback information always indicating a specific value in response to the reception of the first SPS PDSCH after the activation. A terminal comprising: (Section 2) The terminal according to claim 1, wherein the specific value is a value indicating either an ACK or a NACK. (Section 3) 2. The terminal according to claim 1, wherein the specific value indicated by the feedback information is determined regardless of a decoding result of the first SPS PDSCH. (Section 4) the feedback is HARQ feedback; 2. The terminal according to claim 1, wherein the feedback disablement is configured for each HARQ process corresponding to the PDSCH. (Section 5) 2. The terminal according to claim 1, wherein the activation of the SPS PDSCH is performed based on downlink control information transmitted from the base station. (Section 6) a control unit that controls activation of SPS (Semi-Persistent Scheduling); and a transmitter that transmits, to a base station, feedback information corresponding to a decoding result of a first SPS PDSCH (Physical Downlink Shared Channel) received after the activation, when the terminal is set to disable feedback corresponding to a PDSCH (Physical Downlink Shared Channel). (Section 7) A communication method performed by a terminal, comprising: Controlling activation of Semi-Persistent Scheduling (SPS); and when the terminal is configured to disable feedback corresponding to a PDSCH (Physical Downlink Shared Channel), transmitting feedback information to a base station, the feedback information always indicating a specific value in response to reception of the first SPS PDSCH after the activation.

[0092] Any of the above configurations provides a technique that enables semi-persistent scheduling to be applied to a non-terrestrial network. According to clause 2, the terminal 20 can start receiving downlink data to which semi-persistent scheduling is applied after confirming that activation of semi-persistent scheduling has been successful. According to clause 3, the terminal 20 can receive second downlink data to which semi-persistent scheduling is applied after confirming that activation of semi-persistent scheduling has been successful. According to clause 4, the terminal 20 does not need to wait for decoding of downlink data to which semi-persistent scheduling is applied in order to determine feedback. According to clause 5, retransmission based on feedback is applicable to downlink data to which semi-persistent scheduling is applied.

[0093] (Hardware configuration) The block diagrams (FIGS. 16 and 17) 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, by wire, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining the single device or the multiple devices with software.

[0094] 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.

[0095] 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. 18 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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. 16 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 17 may be implemented by a control program stored in the storage device 1002 and running on 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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 outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0104] 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.

[0105] 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.

[0106] Fig. 19 shows an example configuration of a vehicle 2001. As shown in Fig. 19, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0107] The drive unit 2002 is configured, for example, by an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

[0108] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0109] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0110] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 uses information acquired from external devices via the communication module 2013, etc., to provide various types of multimedia information and multimedia services to the occupants of the vehicle 2001.

[0111] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driver's driving burden, such as a millimeter-wave radar, a LiDAR (Light Detection and Ranging), a camera, a positioning locator (e.g., GNSS, etc.), map information (e.g., high-definition (HD) map, autonomous vehicle (AV) map, etc.), a gyro system (e.g., an IMU (Inertial Measurement Unit), an INS (Inertial Navigation System), etc.), an AI (Artificial Intelligence) chip, and an AI processor, as well as one or more ECUs that control these devices. The driving assistance system unit 2030 also transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0112] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0113] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from the external device via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

[0114] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and the detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, which are input to the electronic control unit 2010.

[0115] The communication module 2013 receives various information (traffic information, traffic signal information, inter-vehicle information, etc.) transmitted from external devices and displays it on an information service unit 2012 provided in the vehicle 2001. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, sensors 2021 to 2029, etc. provided in the vehicle 2001.

[0116] (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.

[0117] 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.

[0118] Each aspect / embodiment described in the present disclosure may be any of the following: LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or decimal number)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), 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 The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), or other appropriate systems, and next-generation systems that are extended, modified, created, or defined based on these systems. The present invention may also be applied to a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G).

[0119] 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.

[0120] 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).

[0121] The information, signals, etc. 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.

[0122] 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.

[0123] 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).

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0129] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0130] 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.

[0131] 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.

[0132] 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.

[0133] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0134] 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.

[0135] 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.

[0136] Furthermore, a base station in the present disclosure may be read as a user 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 user 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 terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0137] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0138] 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.

[0139] 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.

[0140] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0141] 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."

[0142] 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.

[0143] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] 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, etc. instead of a subframe.

[0151] 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.

[0152] 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.

[0153] 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.

[0154] 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.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be set for the terminal 20 within one carrier.

[0162] At least one of the configured BWPs may be active, and the terminal 20 may not expect to transmit or receive a predetermined signal / channel outside the active BWP. Note that the terms "cell," "carrier," and the like in this disclosure may be read as "BWP."

[0163] 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.

[0164] 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.

[0165] 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."

[0166] 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).

[0167] 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]

[0168] 10 base station 10A satellite 10B Gateway 10C terrestrial base station 10D CN 10E Flying Object 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 terminals 210 Transmitter 220 Receiving unit 230 Setting Section 240 Control Unit 30 Core Network 1001 processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication equipment 1005 Input Device 1006 Output Device 2001 Vehicle 2002 Drive unit 2003 Steering Section 2004 accelerator pedal 2005 brake pedal 2006 Shift Lever 2007 front wheel 2008 rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 RPM Sensor 2023 Air Pressure Sensor 2024 Vehicle speed sensor 2025 Acceleration Sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driving Assistance Systems Department 2031 microprocessor 2032 memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. a control unit that controls activation of SPS (Semi-Persistent Scheduling); A terminal comprising: a transmitter that, when the terminal is set to disable feedback corresponding to a PDSCH (Physical Downlink Shared Channel), always transmits feedback information indicating a specific value to a base station in response to reception of the first SPS PDSCH after the activation.

2. The terminal according to claim 1 , wherein the specific value is a value indicating either an ACK or a NACK.

3. The terminal according to claim 1 , wherein the specific value indicated by the feedback information is determined regardless of a decoding result of the first SPS PDSCH.

4. the feedback is HARQ (Hybrid Automatic Repeat reQuest) feedback, The terminal according to claim 1 , wherein the feedback disablement is set for each HARQ process corresponding to the PDSCH.

5. The terminal according to claim 1 , wherein the activation of the SPS PDSCH is performed based on downlink control information transmitted from the base station.

6. a control unit that controls activation of SPS (Semi-Persistent Scheduling); A terminal comprising: a transmitter that transmits, to a base station, feedback information according to a decoding result of a first SPS PDSCH (Physical Downlink Shared Channel) received after the activation, when the terminal is set to disable feedback corresponding to a PDSCH (Physical Downlink Shared Channel).

7. A communication method performed by a terminal, comprising: Controlling activation of Semi-Persistent Scheduling (SPS); and when the terminal is configured to disable feedback corresponding to a PDSCH (Physical Downlink Shared Channel), transmitting feedback information to a base station, the feedback information always indicating a specific value in response to reception of the first SPS PDSCH after the activation.

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