Terminal and communication method

Abstract

The terminal includes: a control unit that determines the following resources: the resources are frequency domain resources included in the time domain of the first channel configured for sending a response related to retransmission control and are not used in the transmission of the first channel; and a sending unit that uses the resources to send a second channel or a signal.

Description

Technical Field

[0001] The present invention relates to a terminal and a communication method in a wireless communication system. Background Art

[0002] In LTE (Long Term Evolution) and its successor systems (e.g., LTE-A (LTE Advanced), NR (New Radio) (also known as 5G)), D2D (Device to Device) technology, which allows direct communication between terminals without going through a base station, is being studied (e.g., non-patent document 1).

[0003] D2D reduces the traffic between terminals and base stations, enabling inter-terminal communication even when base stations are unable to communicate, such as during disasters. While 3GPP (3rd Generation Partnership Project) refers to D2D as "sidelink," this specification uses the more general term D2D. However, in the following descriptions of the embodiments, sidelink may also be used as needed.

[0004] D2D communication is broadly divided into D2D discovery (also called D2D discovery) for discovering other terminals with which communication can be performed, and D2D communication (also called D2D direct communication, D2D communication, direct communication between terminals, etc.) for direct communication between terminals. Hereinafter, when no special distinction is made between D2D communication (D2D communication), D2D discovery (D2D discovery), etc., they are referred to as D2D for short. In addition, signals sent and received via D2D are referred to as D2D signals. Various use cases for services related to V2X (Vehicle to Everything) in NR are being studied (e.g., Non-Patent Document 2).

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-Patent Document 1: 3GPP TS 36.211 V15.7.0 (September 2019)

[0008] Non-Patent Document 2: 3GPP TR 22.886 V15.1.0 (2017-03) Summary of the Invention

[0009] Problems to be solved by the invention

[0010] In NR-V2X, direct inter-device communication supports sidelink HARQ (Hybrid Automatic Repeat Request) responses. The PSFCH (Physical Sidelink Feedback Channel), which transmits and receives HARQ responses, is allocated in different symbols from the PSCCH (Physical Sidelink Control Channel) or PSSCH (Physical Sidelink Shared Channel). Therefore, because the PSFCH is not frequency-multiplexed with the PSCCH or PSSCH, resources not used for transmitting and receiving HARQ responses in the symbols allocated with the PSFCH remain unused, reducing resource utilization efficiency.

[0011] The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the utilization efficiency of resources related to HARQ (Hybrid automatic repeat request) responses in inter-UE direct communication.

[0012] Means for solving problems

[0013] According to the disclosed technology, a terminal is provided, which has: a control unit, which determines the following resources: the resources are frequency domain resources contained in the time domain of the first channel configured for sending a response related to retransmission control and are not used in the transmission of the first channel; and a sending unit, which uses the resources to send a second channel or signal.

[0014] Effects of the Invention

[0015] According to the disclosed technology, it is possible to improve the utilization efficiency of resources related to HARQ (Hybrid automatic repeat request) responses in inter-terminal direct communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a diagram used to explain V2X.

[0017] Figure 2 This is a diagram for explaining example (1) of the V2X transmission mode.

[0018] Figure 3 This is a diagram for explaining example (2) of the V2X transmission mode.

[0019] Figure 4 This is a diagram for explaining example (3) of the V2X transmission mode.

[0020] Figure 5 This is a diagram for explaining example (4) of the V2X transmission mode.

[0021] Figure 6 This is a diagram for explaining example (5) of the V2X transmission mode.

[0022] Figure 7 This is a diagram for explaining example (1) of the V2X communication type.

[0023] Figure 8 This is a diagram for explaining example (2) of the V2X communication type.

[0024] Figure 9 This is a diagram for explaining example (3) of the V2X communication type.

[0025] Figure 10 This is a timing diagram showing an operation example (1) of V2X.

[0026] Figure 11 This is a timing diagram showing an operation example (2) of V2X.

[0027] Figure 12 This is a timing diagram showing an operation example (3) of V2X.

[0028] Figure 13 This is a timing diagram showing an operation example (4) of V2X.

[0029] Figure 14 It is a diagram showing an example of a HARQ response.

[0030] Figure 15 This is a diagram showing example (1) of resource allocation related to HARQ response in an embodiment of the present invention.

[0031] Figure 16 This is a diagram showing example (2) of resource configuration related to HARQ response in an embodiment of the present invention.

[0032] Figure 17 This is a diagram showing example (3) of resource configuration related to HARQ response in an embodiment of the present invention.

[0033] Figure 18 This is a diagram showing a configuration example (1) of resources related to HARQ responses in an embodiment of the present invention.

[0034] Figure 19 This is a diagram showing a configuration example (2) of resources related to HARQ responses in an embodiment of the present invention.

[0035] Figure 20This is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention.

[0036] Figure 21 This is a diagram showing an example of the functional configuration of the terminal 20 in the embodiment of the present invention.

[0037] Figure 22 This is a diagram showing an example of the hardware configuration of the base station 10 or the terminal 20 in the embodiment of the present invention. DETAILED DESCRIPTION

[0038] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the embodiment described below is merely an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0039] When operating the wireless communication system according to the embodiments of the present invention, existing technologies are appropriately used. However, this existing technology is, for example, existing LTE, but is not limited to existing LTE. In addition, unless otherwise specified, the term "LTE" used in this specification has a broad meaning that includes LTE-Advanced and subsequent technologies (such as NR) or wireless LANs (Local Area Networks).

[0040] Furthermore, in the embodiment of the present invention, the duplexing method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or other methods (for example, flexible duplex, etc.).

[0041] Furthermore, in the embodiment of the present invention, “configuring” wireless parameters and the like may be pre-configuring predetermined values, or may be configuring wireless parameters notified from the base station 10 or the terminal 20 .

[0042] Figure 1 This is a diagram for explaining V2X. In 3GPP, the technology to realize V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending D2D functions is being studied and standardized. Figure 1As shown, V2X is a part of ITS (Intelligent Transport Systems), and is a general term for V2V (Vehicle to Vehicle) which represents the communication between vehicles, V2I (Vehicle to Infrastructure) which represents the communication between vehicles and roadside equipment (RSU: Road-Side Unit) installed next to the road, V2N (Vehicle to Network) which represents the communication between vehicles and ITS servers, and V2P (Vehicle to Pedestrian) which represents the communication between vehicles and mobile terminals held by pedestrians.

[0043] Furthermore, 3GPP is researching V2X, which utilizes cellular communications and inter-device communications using LTE or NR. V2X using cellular communications is also referred to as cellular V2X. Research is progressing on achieving high capacity, low latency, high reliability, and QoS (Quality of Service) control in NR-based V2X.

[0044] Regarding LTE and NR V2X, research is envisioned to continue beyond 3GPP specifications. For example, research is envisioned to address interoperability, reduce costs associated with high-level installation, integrate and switch between multiple RATs (Radio Access Technologies), support for national regulations, and data acquisition, distribution, database management, and usage for LTE and NR V2X platforms.

[0045] In the embodiments of the present invention, the communication device is primarily envisioned as being mounted on a vehicle, but the embodiments of the present invention are not limited to this. For example, the communication device can be a terminal held by a person, a device mounted on a drone or aircraft, a base station, an RSU, a relay node, a terminal with scheduling capabilities, etc.

[0046] In addition, SL (Sidelink) can also be distinguished by UL (Uplink) or DL (Downlink) and any one or a combination of the following 1) to 4). In addition, SL can also be other names.

[0047] 1) Time Domain Resource Allocation

[0048] 2) Frequency Domain Resource Allocation

[0049] 3) Reference synchronization signal (including SLSS (Sidelink Synchronization Signal))

[0050] 4) Reference signal used for path loss measurement for transmit power control

[0051] Furthermore, for SL or UL OFDM (Orthogonal Frequency Division Multiplexing), any of CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM), untransformed OFDM, or transformed precoded OFDM can be used. SL can also operate in a multi-carrier environment.

[0052] LTE's SL specifies Mode 3 and Mode 4 for SL resource allocation to terminal 20. In Mode 3, transmission resources are dynamically allocated using DCI (Downlink Control Information) sent from base station 10 to terminal 20. Mode 3 also supports Semi-Persistent Scheduling (SPS). In Mode 4, terminal 20 autonomously selects transmission resources from a resource pool.

[0053] In addition, the time slot in the embodiments of the present invention may be replaced by a symbol, a mini-slot, a subframe, a radio frame, or a TTI (Transmission Time Interval). Furthermore, the cell in the embodiments of the present invention may be replaced by a cell group, a carrier component, a BWP (Bandwidth Part), a resource pool, a resource, a RAT (Radio Access Technology), a system (including a wireless LAN), etc.

[0054] Figure 2 This is a diagram for explaining example (1) of the V2X transmission mode. Figure 2In the transmission mode of the sidelink communication shown in FIG, in step 1, the base station 10 sends the sidelink schedule to the terminal 20A. Then, the terminal 20A sends the PSCCH (Physical Sidelink Control Channel) and PSSCH (Physical Sidelink Shared Channel) to the terminal 20B according to the received schedule (step 2). Figure 2 The transmission mode of the sidelink communication shown is called sidelink transmission mode 3 in LTE. In sidelink transmission mode 3 in LTE, sidelink scheduling based on Uu is performed. Uu refers to the radio interface between UTRAN (Universal Terrestrial Radio Access Network) and UE (User Equipment). Figure 2 The transmission mode of the sidelink communication shown is called sidelink transmission mode 1 in NR.

[0055] Figure 3 This is a diagram for explaining example (2) of the V2X transmission mode. Figure 3 In the transmission mode of the side link communication shown in FIG, in step 1, the terminal 20A transmits the PSCCH and PSSCH to the terminal 20B using the resources selected autonomously. Figure 3 The transmission mode of the sidelink communication shown is called sidelink transmission mode 4 in LTE. In sidelink transmission mode 4 in LTE, the UE itself performs resource selection.

[0056] Figure 4 This is a diagram for explaining example (3) of the V2X transmission mode. Figure 4 In the transmission mode of the sidelink communication shown in FIG, in step 1, the terminal 20A transmits the PSCCH and PSSCH to the terminal 20B using the resources selected autonomously. Similarly, the terminal 20B transmits the PSCCH and PSSCH to the terminal 20A using the resources selected autonomously (step 1). Figure 4 The transmission mode of the sidelink communication shown is called sidelink transmission mode 2a in NR. In sidelink transmission mode 2 in NR, the terminal 20 performs resource selection itself.

[0057] Figure 5 This is a diagram for explaining example (4) of the V2X transmission mode. Figure 5In the transmission mode of the sidelink communication shown in FIG, in step 0, the base station 10 sets a grant for transmitting the sidelink to the terminal 20A via RRC (Radio Resource Control). Then, the terminal 20A transmits the PSSCH to the terminal 20B according to the received resource mode (step 1). Figure 5 The transmission mode of the sidelink communication shown is called sidelink transmission mode 2c in NR.

[0058] Figure 6 This is a diagram for explaining example (5) of the V2X transmission mode. Figure 6 In the transmission mode of the sidelink communication shown in FIG, in step 1, the terminal 20A transmits the sidelink schedule to the terminal 20B via the PSCCH. Then, the terminal 20B transmits the PSSCH to the terminal 20A according to the received schedule (step 2). Figure 6 The transmission mode of the sidelink communication shown is called sidelink transmission mode 2d in NR.

[0059] Figure 7 This is a diagram for explaining example (1) of the V2X communication type. Figure 7 The communication type of the side link shown is unicast. Terminal 20A sends PSCCH and PSSCH to terminal 20. Figure 7 In the example shown, the terminal 20A performs unicast to the terminal 20B, and also performs unicast to the terminal 20C.

[0060] Figure 8 This is a diagram for explaining example (2) of the V2X communication type. Figure 8 The communication type of the side link shown is multicast. Terminal 20A transmits PSCCH and PSSCH to the group to which one or more terminals 20 belong. Figure 8 In the example shown, the group includes the terminal 20B and the terminal 20C, and the terminal 20A performs multicast for the group.

[0061] Figure 9 This is a diagram for explaining example (3) of the V2X communication type. Figure 9 The communication type of the side link shown is broadcast. Terminal 20A transmits PSCCH and PSSCH to one or more terminals 20. Figure 9 In the example shown, terminal 20A broadcasts to terminal 20B, terminal 20C, and terminal 20D. Figures 7 to 9 The terminal 20A shown is referred to as a head-UE.

[0062] Furthermore, NR-V2X envisions supporting HARQ (Hybrid Automatic Repeat Request) in both unicast and multicast on the sidelink. Furthermore, NR-V2X defines SFCI (Sidelink Feedback Control Information) that includes HARQ responses. Furthermore, research is underway to transmit SFCI via the Physical Sidelink Feedback Channel (PSFCH).

[0063] In addition, the following description assumes that the PSFCH is used for transmission of HARQ-ACK in the sidelink, but this is only an example. For example, HARQ-ACK in the sidelink can be transmitted using the PSCCH, the PSSCH, or other channels.

[0064] For ease of explanation, all information reported by terminal 20 in HARQ is referred to below as HARQ-ACK. This HARQ-ACK may also be referred to as HARQ-ACK information. Furthermore, more specifically, the codebook used for HARQ-ACK information reported from terminal 20 to base station 10, etc., is referred to as the HARQ-ACK codebook. The HARQ-ACK codebook defines the bit string of the HARQ-ACK information. Furthermore, HARQ-ACK allows NACKs to be transmitted in addition to ACKs.

[0065] Figure 10 This is a diagram showing an example (1) of the structure and operation of a wireless communication system in an embodiment of the present invention. Figure 10 As shown in FIG. 1 , the wireless communication system according to the embodiment of the present invention includes a terminal 20A and a terminal 20B. In addition, there are actually a plurality of user devices, but Figure 10 The terminal 20A and the terminal 20B are shown as examples.

[0066] Hereinafter, when the terminals 20A and 20B are not particularly distinguished, they are simply referred to as "terminal 20" or "user device". Figure 10 In the embodiment, the case where both the terminal 20A and the terminal 20B are within the coverage of the cell is shown as an example, but the operation in the embodiment of the present invention can also be applied to the case where the terminal 20B is outside the coverage.

[0067] As described above, in this embodiment, the terminal 20 is a device mounted on a vehicle, such as an automobile, and has cellular communication functions and sidelink functions as a UE in LTE or NR. The terminal 20 may also be a general portable terminal (such as a smartphone). Furthermore, the terminal 20 may also be an RSU. This RSU may be a UE-type RSU (UE type RSU) that has UE functions, or a gNB-type RSU (gNB type RSU) that has base station functions.

[0068] Furthermore, the terminal 20 does not need to be a device having a single housing. For example, even when various sensors are dispersedly arranged in a vehicle, a device including these various sensors is also the terminal 20 .

[0069] Furthermore, the processing of sidelink transmit data by terminal 20 is essentially the same as that of UL transmission in LTE or NR. For example, terminal 20 scrambles the codewords of transmit data, modulates them, and generates complex-valued symbols. These complex-valued symbols (transmit signals) are mapped to layer 1 or layer 2 and precoded. The precoded complex-valued symbols are then mapped to resource elements to generate a transmit signal (e.g., a complex-valued time-domain SC-FDMA signal), which is then transmitted from each antenna port.

[0070] The base station 10 also has cellular communication functions as a base station in LTE or NR, as well as functions for enabling communication with the terminal 20 in this embodiment (e.g., resource pool configuration, resource allocation, etc.). Furthermore, the base station 10 may also be an RSU (gNB-type RSU).

[0071] In addition, in the wireless communication system according to the embodiment of the present invention, the signal waveform used by the terminal 20 in the SL or UL may be OFDMA, SC-FDMA, or other signal waveforms.

[0072] In step S101 , the terminal 20A autonomously selects resources to be used for the PSCCH and PSSCH from a resource selection window having a predetermined duration. The resource selection window may be set by the base station 10 for the terminal 20 .

[0073] In steps S102 and S103, terminal 20A uses the resources autonomously selected in step S101 to transmit SCI (Sidelink Control Information) using the PSCCH and transmit SL data using the PSSCH. For example, terminal 20A may transmit SCI (PSCCH) using the same time resources as the PSSCH and frequency resources adjacent to the PSSCH's frequency resources.

[0074] Terminal 20B receives the SCI (PSCCH) and SL data (PSSCH) transmitted from terminal 20A. The SCI received via the PSCCH may include information about the PSFCH resources used by terminal 20B to transmit HARQ-ACK for the received data. Terminal 20A may include information about the autonomously selected resources in the SCI and transmit it.

[0075] In step S104 , the terminal 20B transmits a HARQ-ACK for the received data to the terminal 20A using the resources of the PSFCH specified by the received SCI.

[0076] If the HARQ-ACK received in step S104 is a NACK (negative acknowledgement) indicating a retransmission request, terminal 20A retransmits PSCCH and PSSCH to terminal 20B in step S105. Terminal 20A can retransmit PSCCH and PSSCH using autonomously selected resources.

[0077] In addition, when HARQ control is not performed, steps S104 and S105 may not be performed.

[0078] Figure 11 This is a diagram showing an example (2) of the configuration and operation of a wireless communication system in an embodiment of the present invention. Blind retransmission may be performed independently of HARQ control for improving the transmission success rate or reach.

[0079] In step S201 , the terminal 20A autonomously selects resources to be used for the PSCCH and PSSCH from a resource selection window having a predetermined duration. The resource selection window may be set by the base station 10 for the terminal 20 .

[0080] In steps S202 and S203, terminal 20A uses the resources autonomously selected in step S201 to transmit SCI using PSCCH and transmit SL data using PSSCH. For example, terminal 20A may transmit SCI (PSCCH) using the same time resources as the PSSCH and frequency resources adjacent to the PSSCH frequency resources.

[0081] In step S204, the terminal 20A retransmits the SCI based on the PSCCH and the SL data based on the PSSCH to the terminal 20B using the resources autonomously selected in step S201. The retransmission in step S204 may be performed multiple times.

[0082] In addition, when blind retransmission is not performed, step S204 may not be performed.

[0083] Figure 12 This figure shows an example (3) of the structure and operation of a wireless communication system in an embodiment of the present invention. The base station 10 can perform sidelink scheduling. That is, the base station 10 can determine the sidelink resources used by the terminal 20 and transmit information indicating the resources to the terminal 20. Furthermore, when HARQ control is applied, the base station 10 can transmit information indicating PSFCH resources to the terminal 20.

[0084] In step S301, the base station 10 transmits DCI (Downlink Control Information) to the terminal 20A using the PDCCH, thereby performing SL scheduling. Hereinafter, for convenience of explanation, the DCI for SL scheduling is referred to as SL scheduling DCI.

[0085] Furthermore, in step S301, it is assumed that base station 10 also transmits DCI for DL scheduling (also referred to as DL allocation) to terminal 20A using the PDCCH. Hereinafter, for convenience, the DCI for DL scheduling is referred to as DL scheduling DCI. Upon receiving the DL scheduling DCI, terminal 20A receives DL data using the PDSCH, using the resources specified by the DL scheduling DCI.

[0086] In steps S302 and S303, Terminal 20A uses the resources specified by the SL scheduling DCI to transmit SCI (Sidelink Control Information) using the PSCCH and transmit SL data using the PSSCH. Alternatively, the SL scheduling DCI may specify only PSSCH resources. In this case, for example, Terminal 20A may transmit SCI (PSCCH) using the same time resources as the PSSCH and frequency resources adjacent to the PSSCH's frequency resources.

[0087] Terminal 20B receives SCI (PSCCH) and SL data (PSSCH) transmitted from terminal 20A. The SCI received on the PSCCH includes information on PSFCH resources for terminal 20B to transmit HARQ-ACK for receiving the data.

[0088] The resource information is included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301. The terminal 20A may also obtain the resource information from the DL scheduling DCI or SL scheduling DCI and include it in the SCI. Alternatively, if the DCI transmitted from the base station 10 does not include the resource information, the terminal 20A may autonomously include the resource information in the SCI and transmit it.

[0089] In step S304 , the terminal 20B transmits HARQ-ACK for the received data to the terminal 20A using the resources of the PSFCH specified by the received SCI.

[0090] In step S305, the terminal 20A transmits a HARQ-ACK using the PUCCH (Physical uplink control channel) resources specified by the DL scheduling DCI (or the SL scheduling DCI), for example, at the timing (e.g., timing in time slots) specified by the DL scheduling DCI (or the SL scheduling DCI), and the base station 10 receives the HARQ-ACK. The HARQ-ACK codebook may include the HARQ-ACK received from the terminal 20B and the HARQ-ACK for the DL data. However, if no DL data is allocated, the HARQ-ACK for the DL data is not included.

[0091] In addition, when HARQ control is not performed, step S304 and step S305 may not be performed.

[0092] Figure 13This is a diagram showing an action example (4) in an embodiment of the present invention. As described above, in the side link of NR, the case of sending HARQ responses through PSFCH is supported. In addition, the format of PSFCH can use the same format as PUCCH (Physical Uplink Control Channel) format 0 (PUCCH format 0). That is, regarding the format of PSFCH, it can be a sequence-based format in which the PRB (Physical Resource Block) size is 1 and ACK and NACK are identified based on the difference in the sequence. The format of PSFCH is not limited to this. The resources of PSFCH can be configured as a codeword at the end of the time slot or multiple codewords at the end. In addition, the period N can be set or pre-defined for the PSFCH resources. The period N can be set in units of time slots or pre-defined.

[0093] exist Figure 13 In the figure, the vertical axis corresponds to the frequency domain and the horizontal axis corresponds to the time domain. PSCCH can be configured in one symbol at the beginning of the time slot, or in multiple symbols starting from the beginning, or in multiple symbols starting from a symbol other than the beginning. PSFCH can be configured in one symbol at the end of the time slot, or in multiple symbols at the end of the time slot. Figure 13 In the example shown, three subchannels are configured in the resource pool, and two PSFCHs are allocated three slots after the slot in which the PSSCH is allocated. The arrow from the PSSCH to the PSFCH represents an example of the PSFCH associated with the PSSCH.

[0094] When the HARQ response in NR-V2X multicast is option 2 of sending ACK or NACK, it is necessary to determine the resources used for PSFCH transmission and reception. Figure 13 As shown, in step S401, terminal 20A as the transmitting terminal 20 performs multicast via SL-SCH to terminal 20B, terminal 20C and terminal 20D as the receiving terminal 20. In the next step S402, terminal 20B uses PSFCH#B to send a HARQ response to terminal 20A, terminal 20C uses PSFCH#C to send a HARQ response to terminal 20A, and terminal 20D uses PSFCH#D to send a HARQ response to terminal 20A. Figure 13 As shown in the example, when the number of available PSFCH resources is less than the number of receiving terminals 20 belonging to the group, it is necessary to decide how to allocate PSFCH resources. In addition, the transmitting terminal 20 can grasp the number of receiving terminals 20 in the multicast.

[0095] Figure 14This is a diagram showing an example of HARQ response. In NR sidelink version 16, frequency division multiplexing (FDM) of PSFCH and PSCCH / PSSCH is not supported in the sidelink. Figure 14 As shown in FIG, PSFCH is transmitted using a different symbol from PSCCH / PSSCH. In addition, only HARQ response is transmitted on PSFCH.

[0096] Therefore, the resources not used for transmitting or receiving HARQ responses during the PSFCH timing remain unused, reducing resource utilization efficiency. To improve resource utilization efficiency, it is preferable to use the frequency resources not used for transmitting or receiving HARQ responses during the PSFCH symbols configured for transmitting or receiving HARQ responses for other purposes.

[0097] Here, a method is proposed of using the following resources for specific channels and / or signals, wherein the resources are time resources (for example, codewords) used in the PSFCH for HARQ response and frequency resources not used in the PSFCH for HARQ response.

[0098] Figure 15 This is a diagram showing an example (1) of resource allocation related to HARQ response in an embodiment of the present invention. Unused frequency resources in PSFCH may refer to any of the following 1) and 2).

[0099] 1) Unused frequency resources in PSFCH can refer to Figure 15 The PSFCH resources are not configured (pre-configured or configured). The frequency resources can be represented by PRB, subchannel, BWP, resource pool, carrier, frequency range, etc.

[0100] 2) Unused frequency resources in PSFCH can refer to Figure 15 The resources shown are configured with a PSFCH and are resources where no PSFCH is transmitted. Alternatively, they may be frequency resources other than resources where a PSFCH is transmitted, regardless of whether or not a PSFCH is configured. The frequency resources may be represented, for example, by PRBs, subchannels, BWPs, resource pools, carriers, or frequency ranges.

[0101] Unused frequency resources in the PSFCH can be used for any one of the following channels and / or signals 1), 2), and 3).

[0102] 1) Reference signal (RS)

[0103] For example, the reference signal may be a PSCCH DM-RS (Demodulation-RS), a PSSCH DM-RS, a PSFCH DM-RS, a CSI-RS (Channel State Information-RS), or a PT-RS (Phase Tracking-RS). Furthermore, the reference signal may be any one of a reference signal used for demodulation, a reference signal used for acquiring channel status, a reference signal used for beam steering, and a reference signal used for phase correction.

[0104] 2) PSCCH and / or PSSCH

[0105] For example, the PSCCH and / or PSSCH may include at least any one of the following a) b) c).

[0106] a) Signal used to reserve future resources (Pre-reservation signal)

[0107] Figure 16 This is a diagram showing example (2) of resource configuration related to HARQ response in an embodiment of the present invention. Figure 16 As shown, the unused frequency resources in PSFCH can be used to reserve signals for future resources. Figure 16 In the example shown, the reserved resources are the 3 sub-channels after the 4th time slot of the signal. It is possible to reserve resources for sub-channels different from the sub-channels used to transmit the signal, or to reserve resources for sub-channels of a number different from the number of sub-channels used to transmit the signal. Figure 16 In the PSFCH timing, the signal is configured in resources where PSFCH is not set, but the signal can also be configured in resources where PSFCH is set but not sent, and can also be configured in frequency resources other than resources where PSFCH is sent, regardless of whether the resources are set with PSFCH.

[0108] b) All or part of a transport block

[0109] For example, it can be Figure 16 All or part of the transport blocks transmitted in the frequency resources not used in the PSFCH in the PSFCH opportunity shown may be transport blocks for which HARQ response is not required.

[0110] c)CSI

[0111] For example, CSI may include at least one of CQI (Channel quality indicator), RI (Rank indicator), PMI (Precoding matrix indicator), LI (Layer indicator), and RSRP (Reference signal received power).

[0112] In addition, for example, a HARQ response corresponding to the PSCCH and / or PSSCH may not be generated, and a PSFCH resource corresponding to the PSCCH and / or PSSCH may not be set.

[0113] In addition, for example, a PSFCH resource corresponding to at least one of the PSCCH and PSSCH may be set, and a HARQ response corresponding to at least one of the PSCCH and PSSCH may be transmitted and received. Figure 17 This is a diagram showing an example (3) of resource configuration related to HARQ response in an embodiment of the present invention. Figure 17 As shown, a PSFCH corresponding to at least a portion of the transport blocks configured in at least a portion of the PSCCH and PSSCH can be set, and a corresponding HARQ response can be sent and received. Figure 17 In the PSFCH opportunity, the transport block is configured in the resources where PSFCH is not set, but the transport block can also be configured in the resources where PSFCH is set but not sent, and can also be configured in the frequency resources other than the resources where PSFCH is sent, regardless of whether the resources are set with PSFCH.

[0114] 3) PSFCH used for purposes other than HARQ response

[0115] For example, at least any one of the following a) b) c) may be included.

[0116] a) CSI (e.g., at least one of CQI, RI, PMI, LI, and RSRP)

[0117] b) SR (Scheduling request)

[0118] c) Signals for BFR (Beam Failure Recovery) (e.g., beam failure indication)

[0119] Furthermore, for example, if PSFCH transmissions for purposes other than HARQ acknowledgments overlap with PSFCH transmissions for HARQ acknowledgments, at least a portion of the information may be multiplexed into the PSFCH resources. Hereinafter, "overlap" primarily refers to resource overlap in the time domain, but "overlap" may also refer to resource overlap in at least one of the time domain, frequency domain, or code domain.

[0120] Furthermore, for example, if a PSFCH transmission for purposes other than HARQ acknowledgments overlaps with a PSFCH transmission for HARQ acknowledgments, either transmission can be discarded based on a set or predefined priority. For example, HARQ acknowledgment transmissions can be prioritized over transmissions for purposes other than HARQ acknowledgments. Furthermore, for example, priorities can be set or predefined for each of CSI, SR, and BFR transmissions.

[0121] Furthermore, for example, if PSFCH transmission or reception for purposes other than HARQ acknowledgments overlaps with PSFCH reception or transmission of HARQ acknowledgments, either transmission or reception may be discarded based on a set or predefined priority. For example, HARQ acknowledgment transmission or reception may be prioritized over transmission or reception for purposes other than HARQ acknowledgments. Furthermore, for example, priorities may be set or predefined for the transmission and reception of CSI, SR, and BFR.

[0122] When PSCCH and / or PSSCH are configured in frequency resources not used in PSFCH, the PSCCH and / or PSSCH can be configured as follows: Figure 18 or Figure 19 As shown.

[0123] Figure 18 This is a diagram showing a configuration example (1) of resources related to HARQ responses in an embodiment of the present invention. Figure 18 This is an example of configuring PSCCH and PSSCH in frequency resources not used in PSFCH. Regarding PSCCH, a single symbol PSCCH having the same structure as the existing two or three symbol PSCCH in the frequency direction can be repeated in the time direction. The same structure as the existing two or three symbol PSCCH can be, for example, Figure 18 As shown in the PSCCH resource block, three REs for PSCCH data and one RE for DMRS are repeated every four REs. The arrangement of data and DMRS is merely an example, and other arrangements are possible.

[0124] The PSSCH may have the same structure as the PSCCH part and may be allocated in the frequency resources not used in the PSFCH, other than the resources allocated with the PSCCH. Figure 18 As shown in the PSSCH resource block, one RE for PSSCH data and one RE for DMRS are repeated every two REs. This data and DMRS configuration is only an example, and other configurations are possible. For example, two REs for PSSCH data and two REs for DMRS may be repeated every four REs.

[0125] Figure 19 This is a diagram showing a configuration example (2) of resources related to HARQ responses in an embodiment of the present invention. This is an example of configuring a single channel in frequency resources not used in PSFCH. The single channel can be either PSCCH or PSSCH. PSCCH or PSSCH can also have Figure 18 The structure is the same as shown.

[0126] like Figure 19 As shown, when PSSCH is configured and multiple types of data (such as control information and transport blocks) are multiplexed, the coding rate can be adjusted according to each data type by setting or pre-defined parameters.

[0127] According to the above embodiment, terminal 20 can avoid frequency domain overlap between the PSFCH used for HARQ responses and newly transmittable channels or signals. Furthermore, by utilizing unused frequency resources in the PSFCH, terminal 20 can improve resource utilization efficiency. Furthermore, by allocating reference signals or control information to unused frequency resources in the PSFCH, terminal 20 can improve transmission quality. Even if these signals are not received, the impact on transmission quality is minimal. Furthermore, in the event of overlapping PSFCH transmissions, terminal 20 can also control collisions.

[0128] That is, it is possible to improve the utilization efficiency of resources related to HARQ (Hybrid automatic repeat request) responses in inter-terminal direct communication.

[0129] (Device Structure)

[0130] Next, the functional configuration examples of the base station 10 and terminal 20 that perform the above-described processing and operations are described. The base station 10 and terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and terminal 20 may each include only a portion of the functions described in the embodiments.

[0131] <Base Station 10>

[0132] Figure 20 1 is a diagram showing an example of the functional configuration of the base station 10. Figure 20 As shown, the base station 10 includes a transmitting unit 110 , a receiving unit 120 , a setting unit 130 , and a control unit 140 . Figure 20 The functional configuration shown is merely an example, and any functional divisions and names of functional units may be used as long as the operations according to the embodiments of the present invention can be executed.

[0133] The transmitter 110 includes a function of generating a signal to be transmitted to the terminal 20 and wirelessly transmitting the signal. The receiver 120 includes a function of receiving various signals transmitted from the terminal 20 and obtaining, for example, higher-layer information from the received signals. Furthermore, the transmitter 110 includes a function of transmitting the NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL reference signals, and the like to the terminal 20.

[0134] The setting unit 130 stores pre-set setting information and various setting information to be sent to the terminal 20 in a storage device, and reads the setting information from the storage device as needed. The content of the setting information is, for example, information related to the setting of D2D communication.

[0135] As described in the embodiments, the control unit 140 performs processing related to the configuration for the terminal 20 to perform D2D communication. Furthermore, the control unit 140 transmits the schedule for D2D communication and DL communication to the terminal 20 via the transmission unit 110. Furthermore, the control unit 140 receives information related to HARQ responses for D2D communication and DL communication from the terminal 20 via the reception unit 120. Functional units related to signal transmission within the control unit 140 may be included in the transmission unit 110, while functional units related to signal reception within the control unit 140 may be included in the reception unit 120.

[0136] <Terminal 20>

[0137] Figure 21 2 is a diagram showing an example of the functional structure of the terminal 20. Figure 21 As shown, the terminal 20 includes a transmitting unit 210 , a receiving unit 220 , a setting unit 230 , and a control unit 240 . Figure 21 The functional configuration shown is merely an example, and any functional divisions and names of functional units may be used as long as the operations according to the embodiments of the present invention can be executed.

[0138] The transmitting unit 210 generates a transmission signal based on the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 receives various signals wirelessly and obtains higher-layer signals from the received physical layer signals. In addition, the receiving unit 220 has the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals or reference signals transmitted from the base station 10. In addition, for example, as D2D communication, the transmitting unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to other terminals 20, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH or PSBCH, etc. from other terminals 20.

[0139] The configuration unit 230 stores various configuration information received by the receiving unit 220 from the base station 10 or the terminal 20 in a storage device and reads it from the storage device as needed. Furthermore, the configuration unit 230 also stores pre-set configuration information. This configuration information may include, for example, information related to D2D communication configuration.

[0140] As described in the embodiment, the control unit 240 controls D2D communication with other terminals 20. Furthermore, the control unit 240 performs processing related to HARQ for D2D communication and DL communication. Furthermore, the control unit 240 transmits to the base station 10 information related to HARQ responses for D2D communication and DL communication to other terminals 20, which are scheduled from the base station 10. Furthermore, the control unit 240 may also schedule D2D communication for other terminals 20. Furthermore, the control unit 240 may autonomously select resources used for D2D communication from a resource selection window. Furthermore, the control unit 240 performs processing related to MCS in the transmission and reception of D2D communication. Functional units related to signal transmission in the control unit 240 may be included in the transmitting unit 210, while functional units related to signal reception in the control unit 240 may be included in the receiving unit 220.

[0141] (Hardware Structure)

[0142] The block diagram used in the description of the above embodiment ( Figure 20 and Figure 21) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired or wireless connections) and using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0143] Functionally, these include, but are not limited to, judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. For example, a functional block (structural unit) that enables the transmission function is called a transmitting unit or a transmitter. As mentioned above, there is no particular limitation on the implementation method.

[0144] For example, the base station 10 , the terminal 20 , and the like in one embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 22 This figure shows an example of the hardware configuration of a base station 10 and a terminal 20 according to one embodiment of the present disclosure. The base station 10 and the terminal 20 described above can also 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, and the like.

[0145] In the following description, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and the terminal 20 may include one or more of the devices shown in the figures, or may exclude some of the devices.

[0146] The various functions in the base station 10 and the terminal 20 are implemented by reading predetermined software (programs) into hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004 or controls at least one of the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0147] Processor 1001 controls the entire computer by, for example, executing an operating system. Processor 1001 may also be comprised of a central processing unit (CPU) including interfaces with peripheral devices, a control device, a computing device, registers, and the like. For example, control unit 140 and control unit 240 described above may also be implemented by processor 1001.

[0148] In addition, the processor 1001 reads a program (program code), a software module, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and performs various processes based on the program. As a program, a program that causes the computer to execute at least a part of the actions described in the above embodiments is used. For example, Figure 20 The control unit 140 of the base station 10 shown may also be implemented by a control program stored in the storage device 1002 and executed in the processor 1001. Figure 21 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and executed by the processor 1001. Regarding the various processes described above, although they are described as being executed by a single processor 1001, they can also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be implemented on one or more chips. Furthermore, the program can be transmitted from a network via a telecommunications line.

[0149] The storage device 1002 is a computer-readable recording medium and may be composed of, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), and RAM (Random Access Memory). The storage device 1002 may also be referred to as a register, cache, or main memory (main storage device). The storage device 1002 can store executable programs (program code), software modules, and the like for implementing the communication method according to one embodiment of the present disclosure.

[0150] The auxiliary storage device 1003 is a computer-readable recording medium, and can be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic stripe, etc. The above-mentioned storage medium can be, for example, a database, a server, or other appropriate medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0151] Communication device 1004 is hardware (a transceiver) used to communicate between computers via at least one of a wired network and a wireless network. It is also referred to as a network device, network controller, network card, or communication module. Communication device 1004 may include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, communication device 1004 may also implement a transceiver antenna, an amplifier, a transceiver, a transmission path interface, and the like. The transceiver may also be physically or logically separated from the transmitter and receiver.

[0152] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED light, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrally formed (e.g., a touch panel).

[0153] Furthermore, the processor 1001, the storage device 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between devices.

[0154] Furthermore, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array), and may implement some or all of the functional blocks using this hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0155] (Summary of Implementation Methods)

[0156] As described above, according to an embodiment of the present invention, a terminal is provided, comprising: a control unit that determines the following resources: the resources are frequency domain resources included in the time domain of the first channel configured for sending a response related to retransmission control and are not used in the transmission of the first channel; and a sending unit that uses the resources to send a second channel or signal.

[0157] According to the above structure, the terminal 20 can avoid overlap in the frequency domain between the PSFCH used for HARQ response and the newly transmittable channel or signal. In addition, the terminal 20 can improve resource utilization efficiency by using unused frequency resources in the PSFCH. In addition, the terminal 20 can improve transmission quality by configuring reference signals or control information in frequency resources unused in the PSFCH, and even if they are not received, the impact on transmission quality is small. In addition, in the case of overlap caused by PSFCH transmission, the terminal 20 can also control the conflict. That is, the utilization efficiency of resources related to HARQ (Hybrid automatic repeat request) response in direct communication between terminals can be improved.

[0158] The control unit can determine frequency domain resources not configured with the first channel, frequency domain resources configured with the first channel but not transmitting the first channel, or frequency domain resources not transmitting the first channel. With this configuration, terminal 20 can avoid frequency domain overlap between the PSFCH used for HARQ responses and newly transmittable channels or signals. Furthermore, by utilizing unused frequency resources in the PSFCH, terminal 20 can improve resource utilization efficiency.

[0159] The transmitting unit may use the resources to transmit at least one of a reference signal, CSI (Channel State Information), a Scheduling Request (SR), and a Beam Failure Recovery (BFR) signal. With this configuration, terminal 20 can improve transmission quality by allocating reference signals or control information to frequency resources not used in the PSFCH.

[0160] The transmitting unit can use the resource to transmit a signal for reserving the resource. According to this configuration, the terminal 20 can improve transmission quality.

[0161] The second channel may be at least one of a control channel and a shared channel. The transmitter may transmit at least a portion of a transport block via the at least one of the control channel and the shared channel. The terminal further includes a receiver configured to receive a response related to retransmission control corresponding to the transport block via the first channel. With this configuration, terminal 20 can improve transmission quality by transmitting the transport block using unused frequency resources in the PSFCH.

[0162] In addition, according to an embodiment of the present invention, a communication method performed by a terminal is provided, wherein the terminal performs the following steps: a control step of determining the following resources: the resources are frequency domain resources contained in the time domain of the first channel configured for sending a response related to retransmission control and are not used in the transmission of the first channel; and a sending step of sending a second channel or signal via the resources.

[0163] With the above-described structure, terminal 20 can avoid frequency domain overlap between the PSFCH used for HARQ responses and newly transmittable channels or signals. Furthermore, by utilizing unused frequency resources in the PSFCH, terminal 20 can improve resource utilization efficiency. Furthermore, by allocating reference signals or control information in unused frequency resources in the PSFCH, terminal 20 can improve transmission quality, minimizing the impact on transmission quality even when not received. Furthermore, terminal 20 can control conflicts even when PSFCH transmissions overlap. This improves resource utilization efficiency related to HARQ (Hybrid Automatic Repeat Request) responses for inter-terminal direct communication.

[0164] (Supplementary Implementation Methods)

[0165] The above describes the embodiments of the present invention, but the disclosed invention is not limited to such embodiments, and those skilled in the art should understand various variations, modifications, substitutions, and replacements. Specific numerical examples are used to facilitate understanding of the invention, but unless otherwise specified, these numerical values are merely examples, and any appropriate value may be used. The distinction between the items in the above description is not essential to the present invention. Matters recorded in two or more items may be combined and used as needed, and matters recorded in one item may be applied to matters recorded in another item (as long as there is no contradiction). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The actions of multiple functional units may be performed by a single physical component, or the actions of one functional unit may be performed by multiple physical components. Regarding the processing procedures described in the embodiments, the order of processing may be reversed unless there is a contradiction. For the convenience of explaining the processing, the base station 10 and the terminal 20 are described using functional block diagrams, but such devices may also be implemented using hardware, software, or a combination thereof. The software that operates by the processor of the base station 10 according to the embodiment of the present invention and the software that operates by the processor of the terminal 20 according to the embodiment of the present invention can also 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 and any other appropriate storage medium.

[0166] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information can be implemented through physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), high-layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, it may also be an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0167] Each form / embodiment described in this disclosure may also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), 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), CDMA 2000, 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), systems using other appropriate systems, and next-generation systems extended therefrom. Furthermore, a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0168] The processing procedures, timings, and flows of each form / implementation described in this specification may be performed in a different order unless there is a conflict. For example, the methods described in this disclosure use an illustrative order to present the elements of various steps, but are not limited to the specific order presented.

[0169] In this specification, specific operations performed by base station 10 may also be performed by its upper node depending on the situation. In a network consisting of one or more network nodes including base station 10, various operations performed to communicate with terminal 20 can be performed by at least one of base station 10 and other network nodes other than base station 10 (e.g., MME or S-GW, but not limited to these). While the above example illustrates a single other network node other than base station 10, the other network node may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0170] The information or signals described in this disclosure can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0171] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0172] The determination in the present disclosure may be performed using a value represented by one bit (0 or 1), a Boolean value (Boolean: true or false), or a comparison of numerical values (for example, comparison with a predetermined value).

[0173] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to instructions, sets of instructions, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0174] Furthermore, software, commands, information, and the like may be transmitted and received via a transmission medium. For example, if software is transmitted from a web page, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, DSL, etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0175] The information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be referred to in the entire description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0176] In addition, the terms used in this disclosure and those 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 also be referred to as a carrier frequency, a cell, or a frequency carrier.

[0177] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0178] In addition, the information, parameters, etc. described in this disclosure may be represented by absolute values, relative values relative to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0179] The names used for the above parameters are not limiting in any way. Furthermore, the formulas and the like using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting in any way.

[0180] In this disclosure, terms such as "base station (BS)," "wireless 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" are used interchangeably. Base stations are sometimes also referred to as macrocells, small cells, femtocells, and picocells.

[0181] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a portion or the entire coverage area of at least one of the base station and base station subsystem that provide communication services within the coverage area.

[0182] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0183] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: 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 appropriate terms.

[0184] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does 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.

[0185] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, regarding a structure in which the communication between a base station and a user terminal is replaced by communication between multiple terminals 20 (for example, it may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), the various forms / implementations of the present disclosure may also be applied. In this case, it may also be configured such that the terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0186] Likewise, the user terminal in the present disclosure may be replaced by a base station. In this case, the base station may also have the functions of the user terminal described above.

[0187] As used in this disclosure, terms such as “determining” and “determining” sometimes also include a variety of actions. “Determining” and “judging” may, for example, include considering matters such as judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (for example, searching in a table, database or other data structure), and ascertaining as matters that have been “determined” or “determined”. In addition, “determining” and “receiving” (for example, receiving information), transmitting (for example, sending information), inputting, outputting, accessing (for example, accessing data in a memory) as matters that have been “determined” or “determined”. In addition, “determining” and “resolving” may include matters such as selecting, choosing, establishing, and comparing as matters that have been “determined” or “determined”. That is, "judgment" and "decision" can include any action that is considered to have been "judged" or "decided." In addition, "judgment (decision)" can also be replaced by "assuming (assuming)," "expecting (expecting)", "considering (considering)", etc.

[0188] The terms "connected", "coupled" or any variation of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include situations where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used instead of "connection". As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region and optical (visible and invisible) region may be used to "connect" or "couple" to each other.

[0189] The reference signal may be referred to as RS (Reference Signal) for short, or may be called a pilot signal depending on the applied standard.

[0190] The phrase "according to" used in this disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to."

[0191] Any reference to an element using the designations "first," "second," etc., as used in this disclosure, does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, a reference to a first element and a second element does not imply that only two elements can be used or that the first element must precede the second element in any manner.

[0192] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section,” “circuit,” “device,” or the like.

[0193] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," are intended to be inclusive. Furthermore, the term "or" used in this disclosure does not mean an exclusive or.

[0194] A radio frame can be composed of one or more frames in the time domain. In the time domain, one or more frames can be called a subframe. A subframe can be further composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the numerology.

[0195] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a signal or channel. For example, the parameter set may represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by the transceiver in the frequency domain, specific windowing performed by the transceiver in the time domain, and the like.

[0196] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0197] A time slot may contain multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in time units larger than a mini-slot may be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as PDSCH (or PUSCH) mapping type B.

[0198] Radio frame, subframe, time slot, mini-time slot, and symbol all represent time units for signal transmission. Radio frame, subframe, time slot, mini-time slot, and symbol may be referred to by other corresponding names.

[0199] For example, a subframe can be called a Transmission Time Interval (TTI), multiple consecutive subframes can be called a TTI, and a slot or mini-slot can be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be a slot, a mini-slot, or the like, rather than a subframe.

[0200] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each terminal 20 by allocating wireless resources (such as the frequency bandwidth and transmit power available to each terminal 20) in units of TTI. The definition of TTI is not limited to this.

[0201] The TTI can be the time unit for transmitting data packets (transport blocks), code blocks, code words, etc. after channel coding, and can also be the processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (for example, the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped can be shorter than the TTI.

[0202] In addition, when one time slot or one mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can constitute the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) constituting the minimum time unit for scheduling can be controlled.

[0203] A TTI with a time length of 1 ms is also called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a time slot, etc.

[0204] In addition, for long TTI (for example, normal TTI, subframe, etc.), it can be replaced with a TTI with a time length of more than 1ms, and for short TTI (for example, shortened TTI, etc.), it can be replaced with a TTI length that is smaller than long TTI (longTTI) and has a TTI length of more than 1ms.

[0205] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined by the parameter set.

[0206] In addition, the time domain of an RB may include one or more symbols and may be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0207] In addition, one or more RBs may be referred to as a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like.

[0208] 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.

[0209] A bandwidth part (BWP) (also known as a fractional bandwidth) can represent a subset of contiguous common resource blocks (RBs) used for a parameter set within a carrier. Common RBs can be identified by their index relative to the common reference point of the carrier. PRBs can be defined within a BWP and numbered within that BWP.

[0210] 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 the terminal 20 within one carrier.

[0211] At least one of the set BWPs may be active, and it is not assumed that the terminal 20 transmits or receives predetermined signals / channels outside the active BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0212] The above-described structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the structures including the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots in a slot, the number of symbols and RBs in a slot or mini-slot, the number of subcarriers in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length.

[0213] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include cases where the noun following the article is in a plural form.

[0214] In this disclosure, the phrase "A and B are different" may also mean "A and B are different from each other." Furthermore, the phrase may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

[0215] Each form / implementation described in this disclosure may be used individually or in combination, and may be switched between them depending on the execution. Furthermore, notification of scheduled information is not limited to being performed explicitly (e.g., a notification of "yes X") but may also be performed implicitly (e.g., not notifying the scheduled information).

[0216] In addition, the HARQ response in the present disclosure is an example of a response related to retransmission control. The PSFCH is an example of a channel for transmitting and receiving responses related to retransmission control. The PSCCH is an example of a control channel. The PSSCH is an example of a shared channel.

[0217] While the present disclosure has been described in detail above, it should be 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 various modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not have any limiting meaning on the present disclosure.

[0218] Description of labels

[0219] 10: base station;

[0220] 110: Sending department;

[0221] 120: receiving unit;

[0222] 130: Setting department;

[0223] 140: Control Department;

[0224] 20: terminal;

[0225] 210: Sending department;

[0226] 220: receiving unit;

[0227] 230: Setting department;

[0228] 240: Control Department;

[0229] 1001: processor;

[0230] 1002: storage device;

[0231] 1003: auxiliary storage device;

[0232] 1004: Communication device;

[0233] 1005: input device;

[0234] 1006: Output device.

Claims

1. A terminal, wherein: The terminal has: a control unit configured to determine a first frequency resource to be used for transmitting a hybrid automatic repeat request response (HARQ response) in inter-terminal communication, and a second frequency resource to be used for transmitting second information for a different purpose than the HARQ response, from among time resources for a channel set for transmission of the HARQ response; as well as A transmitting unit transmits the second information to other terminals in the time resource via the same channel used for transmitting the HARQ response, based on the second frequency resource different from the first frequency resource.

2. The terminal according to claim 1, wherein: The control unit prioritizes the transmission of the HARQ response over the transmission of the second information when the transmission of the HARQ response and the transmission of the second information via the channel overlap.

3. The terminal according to claim 1 or 2, wherein: The first frequency resource and the second frequency resource are represented by physical resource blocks. The terminal according to claim 1 or 2, wherein: The channel is the Physical Sidelink Feedback Channel PSFCH.

5. A communication method, wherein: The terminal performs the following steps: determining a first frequency resource to be used for transmitting a hybrid automatic repeat request response (HARQ response) in inter-terminal communication, and a second frequency resource to be used for transmitting second information for a different purpose than the HARQ response, within a time resource for a channel set for use in transmitting the HARQ response; as well as The second information is transmitted to other terminals in the time resource via the same channel used for transmitting the HARQ response, using the second frequency resource different from the first frequency resource.

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