Terminal and communication method

Abstract

The terminal includes: a receiving unit that receives a response related to retransmission control from another terminal via a first channel; a sending unit that sends the response related to the retransmission control to a base station via a second channel; and a control unit that determines the timing of sending the second channel based on a predetermined time set between the first channel and the second channel.

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 is being studied, in which terminals communicate directly with each other without going through a base station (e.g., non-patent 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 inter-device direct communication, support is provided for reporting sidelink HARQ (Hybrid Automatic Repeat Request) responses to the base station. By notifying the terminal of the number of slots in the Uu (Radio Interface between UTRAN and the User Equipment) starting from the PSFCH (Physical Sidelink Feedback Channel) of the HARQ response on the transceiver side, the timing for transmitting the HARQ response on the PUCCH (Physical Uplink Control Channel) is determined.

[0011] However, since the processing time for reporting the sidelink HARQ response to the base station is not specified, all terminals must perform reporting operations at any reporting timing instructed by the base station, which may be unrealistic from the perspective of terminal cost.

[0012] The present invention has been made in view of the above-mentioned situation, and an object of the present invention is to enable a base station to indicate the timing at which a HARQ (Hybrid automatic repeat request) response is transmitted via uplink in inter-UE direct communication as a value taking into account the processing time of the terminal.

[0013] Means for solving problems

[0014] According to the disclosed technology, a terminal is provided, which includes: a receiving unit, which receives a response related to retransmission control from other terminals via a first channel; a sending unit, which sends the response related to the retransmission control to a base station via a second channel; and a control unit, which determines the timing of sending the second channel based on a predetermined time set between the first channel and the second channel.

[0015] Effects of the Invention

[0016] According to the disclosed technology, a base station can indicate the timing at which a HARQ (Hybrid automatic repeat request) response is transmitted via uplink in inter-UE direct communication as a value that takes into account the processing time of the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a diagram used to explain V2X.

[0018] Figure 2 This is a diagram for explaining example (1) of the V2X transmission mode.

[0019] Figure 3 This is a diagram for explaining example (2) of the V2X transmission mode.

[0020] Figure 4 This is a diagram for explaining example (3) of the V2X transmission mode.

[0021] Figure 5 This is a diagram for explaining example (4) of the V2X transmission mode.

[0022] Figure 6 This is a diagram for explaining example (5) of the V2X transmission mode.

[0023] Figure 7 This is a diagram for explaining an example (1) of a V2X communication type.

[0024] Figure 8 This is a diagram for explaining example (2) of the V2X communication type.

[0025] Figure 9 This is a diagram for explaining example (3) of the V2X communication type.

[0026] Figure 10 This is a timing diagram showing an operation example (1) of V2X.

[0027] Figure 11 This is a timing diagram showing an operation example (2) of V2X.

[0028] Figure 12 This is a timing diagram showing an operation example (3) of V2X.

[0029] Figure 13 This is a timing diagram showing an operation example (4) of V2X.

[0030] Figure 14 This is a diagram showing an example (1) of a HARQ response in the embodiment of the present invention.

[0031] Figure 15 This is a diagram showing an example (2) of a HARQ response in the embodiment of the present invention.

[0032] Figure 16 This is a diagram showing an example (3) of a HARQ response in the embodiment of the present invention.

[0033] Figure 17 This is a diagram showing an example (4) of a HARQ response in the embodiment of the present invention.

[0034] Figure 18 This is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention.

[0035] Figure 19 This is a diagram showing an example of the functional configuration of the terminal 20 in the embodiment of the present invention.

[0036] Figure 20 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

[0037] 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.

[0038] In the operation of the wireless communication system according to the embodiment 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 post-LTE-Advanced systems (for example, NR) or wireless LAN (Local Area Network).

[0039] 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 another method (eg, Flexible Duplex, etc.).

[0040] 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 .

[0041] Figure 1 This is a diagram for explaining V2X. 3GPP is researching technologies to implement V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending D2D functionality and is promoting standardization. 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 units (RSU) 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.

[0042] 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 underway to achieve high capacity, low latency, high reliability, and QoS (Quality of Service) control in NR-based V2X.

[0043] Regarding LTE and NR V2X, research is envisioned to continue beyond 3GPP specifications. For example, research is envisioned on ensuring interoperability, reducing costs due to high-level implementation, combining and switching multiple RATs (Radio Access Technologies), supporting national regulations, and data acquisition, distribution, database management, and usage for LTE and NR V2X platforms.

[0044] 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 form. 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.

[0045] 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.

[0046] 1) Time Domain Resource Allocation

[0047] 2) Frequency Domain Resource Allocation

[0048] 3) Reference synchronization signal (including SLSS (Sidelink Synchronization Signal))

[0049] 4) Reference signal used for path loss measurement for transmit power control

[0050] In addition, for OFDM (Orthogonal Frequency Division Multiplexing) of SL or UL, any one of CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform-Spread-OFDM), OFDM without transform precoding, and OFDM with transform precoding can also be applied.

[0051] 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.

[0052] 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, a resource pool, a resource, a RAT (Radio Access Technology), a system (including a wireless LAN), or the like.

[0053] Figure 2 This is a diagram for explaining an example (1) of a 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 scheduling information 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 based on the received scheduling information (step 2). Figure 2 The transmission mode of the sidelink communication shown is called sidelink transmission mode 3 in LTE. In LTE sidelink transmission mode 3, 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.

[0054] 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.

[0055] Figure 4 This is a diagram for explaining an 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.

[0056] Figure 5 This is a diagram for explaining an 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.

[0057] Figure 6 This is a diagram for explaining an example (5) of a V2X transmission mode. Figure 6 In the transmission mode of the side link communication shown in FIG, in step 1, the terminal 20A transmits the side link schedule to the terminal 20B via the PSCCH. Then, the terminal 20B transmits the PSSCH to the terminal 20A based on the received schedule information (step 2). Figure 6 The transmission mode of the sidelink communication shown is called sidelink transmission mode 2d in NR.

[0058] Figure 7 This is a diagram for explaining an example (1) of a 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.

[0059] 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.

[0060] 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 (header-UE).

[0061] 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).

[0062] In the following description, it is assumed that the PSFCH is used for transmission of HARQ-ACK on the sidelink. However, this is only an example. For example, HARQ-ACK on the sidelink can be transmitted using the PSCCH, the PSSCH, or other channels.

[0063] For convenience, 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.

[0064] Figure 10 FIG1 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.

[0065] 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 example, the case where both terminal 20A and terminal 20B are within the coverage of the cell is shown, but the operations in the embodiment of the present invention can also be applied to the case where terminal 20B is outside the coverage. In addition, this embodiment is not limited to terminals and base stations, and any communication device can be used.

[0066] As described above, in this embodiment, the terminal 20 is a device mounted on a vehicle such as a car, 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). In addition, the terminal 20 may also be an RSU. This RSU may be a UE-type RSU with UE functions or a gNB-type RSU with base station functions.

[0067] 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 .

[0068] 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 and modulates the codewords of transmit data to generate 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.

[0069] The base station 10 also has cellular communication functions as a base station in LTE or NR, as well as functions for enabling the terminal 20 in this embodiment to communicate (e.g., resource pool configuration, resource allocation, etc.). Furthermore, the base station 10 may also be an RSU (gNB-type RSU).

[0070] 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.

[0071] In step S101 , the terminal 20A autonomously selects resources used for the PSCCH and PSSCH from a resource selection window having a predetermined duration. The resource selection window may be set for the terminal 20 by the base station 10 .

[0072] 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.

[0073] 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 the resource information it independently selects in the SCI.

[0074] In step S104 , 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.

[0075] If the HARQ-ACK received in step S104 indicates a retransmission request, that is, a NACK (negative acknowledgement), terminal 20A retransmits PSCCH and PSSCH to terminal 20B in step S105. Terminal 20A can retransmit PSCCH and PSSCH using autonomously selected resources.

[0076] In addition, when HARQ control is not performed, steps S104 and S105 may not be performed.

[0077] 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.

[0078] In step S201 , the terminal 20A autonomously selects resources used for the PSCCH and PSSCH from a resource selection window having a predetermined duration. The resource selection window may be set for the terminal 20 by the base station 10 .

[0079] 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.

[0080] 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.

[0081] In addition, when blind retransmission is not performed, step S204 may not be performed.

[0082] 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 send information indicating the resources to the terminal 20. Furthermore, when HARQ control is applied, the base station 10 can send information indicating at least one of the resources of the PSFCH and the resources of the PUCCH to the terminal 20.

[0083] 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.

[0084] Furthermore, the following scenario is envisioned: in step S301, the base station 10 also transmits DCI for DL ​​scheduling (also referred to as DL allocation) to the 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, the terminal 20A receives DL data using the PDSCH using the resources specified by the DL scheduling DCI.

[0085] 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. Alternatively, SCI may be transmitted using at least one of the PSCCH and PSSCH.

[0086] Terminal 20B receives the SCI (PSCCH) and SL data (PSSCH) transmitted from terminal 20A. The SCI received on the PSCCH may include PSFCH resource information for terminal 20B to transmit HARQ-ACK for the received data.

[0087] Alternatively, the resource information may be included in the DL scheduling DCI or SL scheduling DCI transmitted from the base station 10 in step S301, and the terminal 20A may 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 the result.

[0088] 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.

[0089] 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 SL scheduling DCI), for example, at the timing (e.g., timing in slots) specified by the DL scheduling DCI (or SL scheduling DCI), and the base station 10 receives the HARQ-ACK. The HARQ-ACK codebook may include HARQ-ACK for the sidelink and HARQ-ACK for DL ​​data. However, if no DL data is allocated, HARQ-ACK for DL ​​data is not included.

[0090] In addition, in NR Rel-16, the HARQ-ACK of the side link and the HARQ-ACK for DL ​​data are not included in the same HARQ-ACK codebook. In addition, "HARQ-ACK of the side link" may also refer to the HARQ-ACK corresponding to the channel and / or resource of the side link. More specifically, for example, the base station 10 schedules the terminal 20A, and the terminal 20A sends a transport block to the terminal 20B via the PSCCH / PSSCH. The terminal 20B provides feedback to the terminal 20A regarding the transmission of the transport block via the PSCCH / PSSCH, and based on this, the terminal 20A provides feedback of the HARQ-ACK to the base station 10. For example, the terminal 20A may also relay the HARQ-ACK (acknowledgement (ACK) or negative-acknowledgement (NACK)) received from the terminal 20B to the base station 10.

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

[0092] Figure 13 This is a diagram showing an action example (4) in an embodiment of the present invention. As described above, in the side link of NR, HARQ response is supported via PSFCH. In addition, the format of PSFCH can use the same format as PUCCH (Physical Uplink Control Channel) format 0. That is, the format of PSFCH can also 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 also be configured in the codeword at the end of the time slot, multiple codewords at the end of the time slot, or one or more codewords other than the end of the time slot. In addition, it is predetermined whether to set the period N for the PSFCH resources. The period N can be predetermined whether to set it in units of time slots.

[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 symbols 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, or in one or more symbols other than the end of the time slot. Figure 13 In the example shown, three subchannels are set as a resource pool, and two PSFCHs are arranged three slots after the slot in which the PSSCH is arranged. The arrow from the PSSCH to the PSFCH shows 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, terminal 20C uses PSFCH#C, and terminal 20D uses PSFCH#D to send a HARQ response to terminal 20A. Figure 13As 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 also grasp the number of receiving terminals 20 in the multicast.

[0095] Figure 14 1 is a diagram showing an example (1) of a HARQ response in an embodiment of the present invention. Figure 14 As shown in step 4, the HARQ response in the SL is reported to the base station 10. Figure 14 As shown, in RA (Resource Allocation) mode 1 in which the base station 10 performs SL scheduling, SL-HARQ-ACK is fed back to the base station 10. Furthermore, the embodiments of the present invention are not limited to RA mode 1, and any embodiment may be employed as long as the base station 10 controls at least one of the sidelink transmission and sidelink reception of the terminal 20. Figure 14 The DL / UL carriers shown may also be referred to as Uu carriers. Figure 14 The SL carrier shown is composed of 4 subchannels, but the number of subchannels can be less than 4 or more than 4.

[0096] In DL / UL slot #0, base station 10 transmits a SL schedule to terminal 20A via the PDCCH. Subsequently, in SL slots #2 and #4, terminal 20A transmits SL to terminal 20B via the PSCCH and PSSCH. Subsequently, in SL slot #7, terminal 20B transmits HARQ feedback in the SL to terminal 20A via the PSFCH. Subsequently, in DL / UL slot #10, terminal 20A transmits HARQ feedback to base station 10 via the PUCCH.

[0097] However, the processing time in the terminal 20 when sending the HARQ feedback in the SL to the base station 10 is not specified. Figure 15 : is a diagram showing an example (2) of a HARQ response in an embodiment of the present invention. Figure 15 As shown in the processing time, the time required in the terminal 20 from the PSFCH reception occasion to the PUCCH (or PUSCH) is not specified.

[0098] If the processing time in the terminal 20 for sending HARQ feedback in the SL to the base station 10 is not specified, the terminal 20 must handle sending HARQ feedback in the SL to the base station 10 even when the time from the PSFCH reception timing to the PUCCH (or PUSCH) is very short. However, this is unrealistic from a terminal cost perspective. Furthermore, if the processing time in the terminal 20 for sending HARQ feedback in the SL to the base station 10 is specified, it is unclear what time point is used as a reference and how long it should be. Furthermore, this processing time also needs to take into account the timing offset between the Uu carrier and the SL carrier.

[0099] Therefore, the PSFCH processing time may be defined as follows: The PSFCH processing time may be called by another name, or may be implicitly defined by making the earliest feedback timing that the base station 10 can indicate greater than a specific value (eg, 1).

[0100] Figure 16 : is a diagram showing an example (3) of a HARQ response in an embodiment of the present invention. Figure 16 As shown in FIG. 2 , the PSFCH processing time is the time required for processing in the terminal 20 after receiving the PSFCH, and may be the time that ends at the time when the PUCCH can be transmitted.

[0101] For example, the PSFCH processing time value may be limited for a time interval based on at least one of the following 1) to 3). Hereinafter, "timing" may refer to "starting time," "middle time," or "ending time," and is not limited thereto. "Middle time" may also refer to a point in time when half of the channel duration has passed. Furthermore, "PSFCH timing" may include a single symbol for the interval following the PSFCH.

[0102] 1) PSFCH timing

[0103] 2) Timing of UL feedback channel (PUCCH or PUSCH)

[0104] 3) Specific offset based on the timing of the Uu carrier and the timing of the SL carrier

[0105] For example, the PSFCH processing time may be defined as the time from the timing of the PSFCH reception opportunity. The timing of the corresponding UL feedback channel may be indicated or set after the time point after the PSFCH processing time.

[0106] By defining the PSFCH processing time as described above, the base station 10 can perform scheduling in consideration of the time required for PSFCH processing and PUCCH preparation.

[0107] Figure 17 : is a diagram showing an example (3) of a HARQ response in an embodiment of the present invention. Figure 17 As shown, the PSFCH processing time may also be defined as the period starting from the timing of the PSFCH reception opportunity after a specific offset based on the timing difference between the Uu carrier and the SL carrier or a time based on the specific offset. After the time point after the PSFCH processing time, the timing of the corresponding UL feedback channel may be indicated or set.

[0108] like Figure 17 As shown, the so-called specific offset or the time based on the specific offset can be the offset A between the SL carrier and the Uu carrier, or the offset B between the scheduled SL transmission timing when the offset A is set to 0 and the actual scheduled SL transmission timing, or the maximum value of the offset A and the offset B.

[0109] By defining the PSFCH processing time as described above, the base station 10 can perform scheduling taking into account the time required for PSFCH processing and PUCCH preparation. In other words, the base station 10 can perform scheduling taking into account the actual PSFCH timing, which is typically unknown to the base station 10. Furthermore, even when the offset between the Uu carrier and the SL carrier is large, the base station 10 can perform scheduling that takes into account the processing time in the terminal 20.

[0110] In addition, the PSFCH processing time can be defined using any value from the following 1) to 4).

[0111] 1) The same value as the PDSCH processing time. That is, the same period as the period from PDSCH reception to HARQ feedback transmission can be set as the PSFCH processing time. This allows the terminal 20 to reuse the time required from receiving HARQ feedback to transmitting HARQ feedback.

[0112] 2) The same value set as the period from SPS (Semi-persistent scheduling)-PDSCH release to HARQ feedback. That is, the same period as the period from SPS-PDSCH release notification based on the PDCCH to HARQ feedback transmission can also be set as the PSFCH processing time. For example, in UE processing capability 1, the number of symbols N may be 10 when SCS (Subcarrier Spacing) = 15 kHz, 12 when SCS = 30 kHz, 22 when SCS = 60 kHz, and 25 when SCS = 120 kHz. In addition, for example, in UE processing capability 2, the number of symbols N may be 5 when SCS = 15 kHz, 5.5 when SCS = 30 kHz, and 11 when SCS = 60 kHz. These values ​​are the time from when the HARQ feedback is received from the control information, and can be set to a smaller value that can be achieved by the terminal 20 .

[0113] 3) The same value set as the PUSCH preparation time. That is, the time from UL grant to PUSCH transmission can also be set as the PSFCH processing time. This allows the terminal 20 to reuse the time required from receiving control information to transmitting it.

[0114] 4) A new value or set of values ​​can be defined as a shorter time than the above 1), 2), and 3). This can avoid unnecessary increase in processing time for simplified processing in terminal 20.

[0115] In addition, the PSFCH processing time may also be the time required for processing the PSFCH and / or preparing the UL feedback channel.

[0116] In addition, when multiple SL-HARQ-ACKs are multiplexed into one UL feedback channel, the PSFCH reception timing corresponding to the PSFCH processing time may be the last PSFCH reception timing in the time direction.

[0117] In addition, the UL feedback channel may be PUCCH or PUSCH.

[0118] Through the above-described embodiment, the transmission and reception timing of the PUCCH of the HARQ response in the transmission-side link can be clarified between the base station 10 and the terminal 20 .

[0119] That is, the base station can indicate the timing at which a HARQ (Hybrid automatic repeat request) response in inter-UE direct communication is transmitted via uplink as a value that takes the processing time of the terminal into consideration.

[0120] (Device Structure)

[0121] 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.

[0122] <Base Station 10>

[0123] Figure 18 1 is a diagram showing an example of the functional configuration of the base station 10. Figure 18 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 18 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] <Terminal 20>

[0128] Figure 19 2 is a diagram showing an example of the functional structure of the terminal 20. Figure 19 As shown, the terminal 20 includes a transmitting unit 210 , a receiving unit 220 , a setting unit 230 , and a control unit 240 . Figure 19 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.

[0129] 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.

[0130] 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.

[0131] 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 information related to HARQ responses for D2D communication and DL communication scheduled from the base station 10 to other terminals 20 to 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 the MCS used in D2D communication transmission and reception. 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.

[0132] (Hardware Structure)

[0133] The block diagram used in the description of the above embodiment ( Figure 18 and Figure 19 ) shows blocks in functional units. 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 can be implemented using multiple devices by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired or wireless connections). The functional blocks can also be implemented by combining software in the above-mentioned one device or the above-mentioned multiple devices.

[0134] Functions include, but are not limited to, judgment, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notification, communication, forwarding, configuration, reconfiguring, allocation (allocating, mapping), and assignment. For example, a functional block (structural unit) that enables transmission is called a transmitting unit or transmitter. As described above, there is no particular limitation on the implementation method.

[0135] 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 20This 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.

[0136] 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.

[0137] 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.

[0138] Processor 1001 controls the entire computer by, for example, running an operating system. Processor 1001 may also be comprised of a central processing unit (CPU) that includes 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.

[0139] 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 operations described in the above embodiments is used. For example, Figure 18 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 19 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. Although the various processes described above are executed by a single processor 1001, two or more processors 1001 can also execute the various processes simultaneously or sequentially. The processor 1001 can also be implemented on one or more chips. In addition, the program can also be transmitted from the network via a telecommunications line.

[0140] 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.

[0141] The auxiliary storage device 1003 is a computer-readable recording medium, and may be composed of, for example, 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 (for example, a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (for example, a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic stripe, and the like. The above-mentioned storage medium may 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.

[0142] 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 may also be referred to as a network device, network controller, network card, or communication module. Communication device 1004 may also include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., 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.

[0143] 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).

[0144] 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 using a single bus or may be configured using separate buses for each device.

[0145] 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.

[0146] (Summary of Implementation Methods)

[0147] As described above, according to an embodiment of the present invention, a terminal is provided, which includes: a receiving unit that receives a response related to retransmission control from other terminals via a first channel; a sending unit that sends a response related to the retransmission control to a base station via a second channel; and a control unit that determines the timing of sending the second channel based on a predetermined time set between the first channel and the second channel.

[0148] The above configuration clarifies the PUCCH transmission and reception timing for HARQ responses on the transmitting link between the base station 10 and the terminal 20. Specifically, the base station can indicate the timing for transmitting HARQ (Hybrid Automatic Repeat Request) responses on the uplink in inter-terminal direct communication, using a value that takes into account the terminal's processing time.

[0149] The control unit may determine the timing of transmitting the second channel based on the predetermined time from the timing of the first channel. With this configuration, the base station 10 and the terminal 20 can clearly define the transmission and reception timing of the PUCCH of the HARQ response in the transmission side link.

[0150] The control unit may also determine the timing for transmitting the second channel based on the predetermined time starting from the time point obtained by adding a predetermined offset to the timing of the first channel. With this configuration, the transmission and reception timing of the PUCCH of the HARQ response in the transmitting side link can be clarified between the base station 10 and the terminal 20.

[0151] The predetermined offset can be determined based on the timing difference between the carrier receiving the first channel and the carrier transmitting the second channel. With this configuration, the base station 10 and the terminal 20 can clearly identify the PUCCH transmission and reception timings of the HARQ response in the transmitting link.

[0152] The control unit may also determine the timing for transmitting the second channel based on the predetermined time, which is the same as the time from the release notification of the physical shared channel (SPS) for semi-persistent scheduling to the response related to retransmission control. With this configuration, the transmission and reception timing of the PUCCH for the HARQ response in the transmitting-side link can be clarified between the base station 10 and the terminal 20.

[0153] In addition, according to an embodiment of the present invention, a communication method is provided, wherein the terminal performs the following steps: a receiving step of receiving a response related to retransmission control from other terminals via a first channel; a sending step of sending a response related to the retransmission control to a base station via a second channel; and a control step of determining the timing of sending the second channel based on a predetermined time set between the first channel and the second channel.

[0154] The above configuration clarifies the PUCCH transmission and reception timing for HARQ responses on the transmitting link between the base station 10 and the terminal 20. Specifically, the base station can indicate the timing for transmitting HARQ (Hybrid Automatic Repeat Request) responses on the uplink in inter-terminal direct communication, using a value that takes into account the terminal's processing time.

[0155] (Supplementary Implementation Methods)

[0156] 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, replacements, etc. In order to facilitate understanding of the invention, specific numerical examples are used for description, but unless otherwise specified, these numerical values ​​are only examples, and any appropriate values ​​may also be used. The distinction between the items in the above description is not essential to the present invention. The matters recorded in two or more items can be combined and used as needed, and the matters recorded in one item can be applied to the matters recorded in another item (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of the physical components. The actions of multiple functional units can be performed by one physical component, or the actions of one functional unit can be performed by multiple physical components. Regarding the processing procedures described in the embodiments, the order of processing can be reversed if there is no 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 can also be implemented by 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.

[0157] 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 may be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), high-layer signaling (e.g., 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 be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0158] Each form / embodiment described in this disclosure may also be applied to at least one of systems utilizing 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), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-Wideband), Bluetooth (registered trademark), other appropriate systems, and next-generation systems derived therefrom. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be employed.

[0159] The processing procedures, timings, and flows of each form / implementation described in this specification may be rearranged in 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.

[0160] In this specification, specific actions 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, it is obvious that various actions 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 (for example, but not limited to, an MME or S-GW). 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 (for example, an MME and an S-GW).

[0161] 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.

[0162] 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.

[0163] 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).

[0164] 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.

[0165] Furthermore, software, commands, information, and the like may also 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.

[0166] 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.

[0167] 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.

[0168] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0169] 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.

[0170] The names used for the above parameters are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and the various names assigned to these various channels and information elements are not limiting in any way.

[0171] 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.

[0172] 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 (RRH) for indoor use). 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 that coverage area.

[0173] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0174] 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.

[0175] 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.

[0176] In addition, the base station in the present disclosure can also be replaced by a user terminal. For example, the various forms / implementations of the present disclosure can also be applied to a structure in which the communication between the base station and the user terminal is replaced by the communication between multiple terminals 20 (for example, it can also be called D2D (Device-to-Device: device to device), V2X (Vehicle-to-Everything: vehicle-to-everything) etc.). In this case, it is also possible to form a structure in which the terminal 20 has the functions of the above-mentioned base station 10. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be replaced by side channels.

[0177] 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.

[0178] As used in this disclosure, terms such as “determining” and “determining” sometimes encompass a variety of actions. For example, “determining” and “judging” may include considering matters that have been “judged” or “determined” as matters that have been “judged” or “determined”, such as calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), or ascertaining. Furthermore, “determining” and “receiving” (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, or accessing (e.g., accessing data in a memory) may be considered matters that have been “judged” or “determined”, such as matters that have been “judged” or “determined”. Furthermore, “determining” and “resolving” may include matters that have been “selected,” chosen, established, or compared, such as matters that have been “selected” or “determined”. That is, "judgment" and "decision" can include matters that are considered to have "judged" or "decided" any action. In addition, "judgment (decision)" can also be replaced by "assuming (assuming)", "expecting (expecting)", "considering (considering)", etc.

[0179] The terms "connected", "coupled" or all variations 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 light (including both visible and invisible) region may be used to "connect" or "couple" to each other.

[0180] 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.

[0181] 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."

[0182] 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.

[0183] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section,” “circuit,” “device,” or the like.

[0184] 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.

[0185] 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 also be 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.

[0186] 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.

[0187] 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.

[0188] 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.

[0189] 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.

[0190] 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.

[0191] 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.

[0192] A TTI can be a unit of time for transmitting data packets (transport blocks), code blocks, code words, etc. after channel coding, or a unit of processing such as scheduling and link adaptation. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0193] 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.

[0194] 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.

[0195] In addition, for long TTI (for example, normal TTI, subframe, etc.), it can be understood as a TTI with a time length of more than 1ms, and for short TTI (for example, shortened TTI, etc.), it can be understood as a TTI with a TTI length smaller than long TTI (long TTI) and greater than 1ms.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] A bandwidth part (BWP) (also known as a fractional bandwidth) can also represent a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a carrier. Common RBs can be identified by their index relative to the common reference point for that carrier. PRBs can be defined within a BWP and numbered within that BWP.

[0201] 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.

[0202] 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".

[0203] 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, such as 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.

[0204] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure also includes cases where the noun following the article is in plural form.

[0205] 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."

[0206] 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).

[0207] 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 first channel, and the PUCCH is an example of a second channel.

[0208] 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.

[0209] Description of labels

[0210] 10: Base Station

[0211] 110: Sending Department

[0212] 120: Receiving Department

[0213] 130: Setting Department

[0214] 140: Control Department

[0215] 20: Terminal

[0216] 210: Sending Department

[0217] 220: Receiving Department

[0218] 230: Setting Department

[0219] 240: Control Department

[0220] 1001: Processor

[0221] 1002: Storage device

[0222] 1003: Auxiliary storage device

[0223] 1004: Communication device

[0224] 1005: Input device

[0225] 1006: Output device

Claims

1. A terminal comprising: a receiving unit configured to receive a feedback channel including response information related to the first retransmission control from another terminal; and a transmitting unit that transmits the response information regarding the first retransmission control as response information regarding the second retransmission control to the base station using an uplink channel, The transmitting unit does not transmit the uplink channel including the response information related to the second retransmission control until a first time has passed since a reception timing of the inter-UE direct communication feedback channel. The first time is shorter than an uplink shared channel preparation time which is a second time from when the terminal receives a UL grant (uplink grant) to when the terminal transmits an uplink shared channel corresponding to the UL grant.

2. The terminal according to claim 1, wherein The uplink channel is a physical uplink shared channel or a physical uplink control channel.

3. A communication method for a terminal, comprising the following steps: receiving a feedback channel including response information related to the first retransmission control from another terminal; and transmitting the response information related to the first retransmission control as response information related to the second retransmission control to the base station using an uplink channel; The step of transmitting includes the steps of: not transmitting the uplink channel including the response information related to the second retransmission control until a first time has passed from a reception timing of the inter-UE direct communication feedback channel; The first time is shorter than an uplink shared channel preparation time which is a second time from when the terminal receives a UL grant (uplink grant) to when the terminal transmits an uplink shared channel corresponding to the UL grant.

4. A communication system comprising a terminal and a base station, wherein: The terminal has: a receiving unit configured to receive a feedback channel including response information related to the first retransmission control from another terminal; and a transmitting unit configured to transmit the response information regarding the first retransmission control as response information regarding the second retransmission control to the base station using an uplink channel, The transmitting unit does not transmit the uplink channel including the response information related to the second retransmission control until a first time has passed since a reception timing of the inter-UE direct communication feedback channel. The first time is shorter than an uplink shared channel preparation time as a second time, wherein the second time is a time from when the terminal receives a UL grant (i.e., an uplink grant) to when the terminal transmits an uplink shared channel corresponding to the UL grant. The base station includes a receiving unit that receives the uplink channel from the terminal.

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