Terminal and communication method

Abstract

The terminal comprises: a receiving unit, which receives a response related to retransmission control from another terminal via a first channel for transmitting and receiving responses related to retransmission control; a control unit, which receives information indicating a first offset from a base station, wherein the first offset is an offset in the time domain from the first channel to a second channel for transmitting the response related to retransmission control to the base station; and a sending unit, which sends the response related to retransmission control to the base station via the second channel, wherein the control unit determines a time domain position of the second channel based on the first offset and a second offset applied to the time domain position of the first channel that determines a starting point of the first offset.

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 LTE's 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 the terminal and the base station, and enables communication between the terminals even when the base station cannot communicate during disasters. In addition, in 3GPP (3rd Generation Partnership Project), D2D is called "sidelink", but in this specification, a more general term, D2D, is used. However, in the description of the implementation methods described later, sidelink is also used as needed.

[0004] D2D communication is roughly divided into D2D discovery (also called D2D discovery) for discovering other terminals that can communicate, and D2D communication (also called D2D direct communication, D2D communication, direct communication between terminals, etc.) for direct communication between terminals. Hereinafter, when D2D communication (D2D communication), D2D discovery (D2D discovery), etc. are not specifically distinguished, they are referred to as D2D. 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 (for example, non-patent document 2).

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-patent document 1: 3GPP TS 36.211 V15.7.0 (2019-09)

[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 the direct communication between terminals in NR-V2X, the action of reporting the HARQ (Hybrid automatic repeat request) response of the side link to the base station is supported. The number of time slots in Uu (The Radio interface between UTRAN and the User Equipment: the wireless interface between UTRAN and the user equipment) starting from the PSFCH (Physical Sidelink Feedback Channel: the physical sidelink feedback channel) of the HARQ response of the transceiver side link is notified to the terminal, thereby determining the timing of sending the PUCCH (Physical Uplink Control Channel: the physical uplink control channel) of the HARQ response.

[0011] However, when the base station is unaware of the synchronization timing of the sidelink, a difference may occur in the timing of transmitting the PUCCH of the HARQ response of the sidelink between the base station and the terminal.

[0012] The present invention has been made in view of the above circumstances, and an object of the present invention is to adjust the timing at which a HARQ (Hybrid automatic repeat request) response is transmitted in uplink in D2D communication.

[0013] Means for solving problems

[0014] According to the disclosed technology, a terminal is provided, comprising: a receiving unit, which receives a response related to retransmission control from another terminal via a first channel for transmitting and receiving responses related to retransmission control; a control unit, which receives information indicating a first offset from a base station, the first offset being an offset in the time domain from the first channel to a second channel for transmitting the response related to retransmission control to the base station; and a sending unit, which sends the response related to retransmission control to the base station via the second channel, the control unit determining a time domain position of the second channel based on the first offset and a second offset applied at the time domain position of the first channel that determines a starting point of the first offset.

[0015] Effects of the Invention

[0016] According to the disclosed technology, it is possible to adjust the timing at which a HARQ (Hybrid automatic repeat request) response is transmitted in uplink in D2D communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a diagram for explaining 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 example (1) of the V2X communication type.

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

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

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

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

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

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

[0030] Fig.14 This is a diagram showing an example (1) of a HARQ response.

[0031] Fig.15 This is a diagram showing example (2) of a HARQ response.

[0032] Fig.16 This is a diagram showing example (3) of a HARQ response.

[0033] Fig.17 This is a diagram showing an example (1) of a HARQ response in the embodiment of the present invention.

[0034] Fig.18 This is a diagram showing example (2) of a HARQ response in the embodiment of the present invention.

[0035] Fig.19 This is a diagram showing example (3) of a HARQ response in the embodiment of the present invention.

[0036] Fig. 20 This is a diagram showing example (4) of a HARQ response in the embodiment of the present invention.

[0037] Fig.21 It is a diagram showing an example of the functional configuration of the base station 10 in the embodiment of the present invention.

[0038] Fig. 22 This is a diagram showing an example of the functional configuration of the terminal 20 in the embodiment of the present invention.

[0039] Fig.23 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

[0040] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In addition, the embodiment described below is only an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0041] When the wireless communication system of the embodiment of the present invention is operated, the existing technology is appropriately used. However, the existing technology is, for example, the existing LTE, but is not limited to the existing LTE. In addition, unless otherwise specified, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and methods after LTE-Advanced (such as NR) or wireless LAN (Local Area Network).

[0042] Furthermore, in the embodiments 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.).

[0043] 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 .

[0044] Figure 1This is a diagram for explaining V2X. In 3GPP, the technology of implementing V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending D2D functions is being studied and standardized. Figure 1 As shown, V2X is a part of ITS (Intelligent Transport Systems), which 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.

[0045] In addition, 3GPP is studying V2X using cellular communication and terminal-to-terminal communication using LTE or NR. V2X using cellular communication is also called cellular V2X. In NR's V2X, research is being promoted to achieve large capacity, low latency, high reliability, and QoS (Quality of Service) control.

[0046] Regarding LTE or NR V2X, it is envisioned that research beyond 3GPP specifications will be conducted in the future. For example, research is envisioned to ensure interoperability, reduce costs due to high-level installation, use or switching methods of multiple RATs (Radio Access Technology), regulatory support in various countries, and data acquisition, publication, database management, and usage methods of LTE or NR V2X platforms.

[0047] In the embodiments of the present invention, it is mainly envisioned that the communication device is mounted on a vehicle, but the embodiments of the present invention are not limited to this method. For example, the communication device can be a terminal held by a person, the communication device can also be a device mounted on a drone or an aircraft, the communication device can also be a base station, RSU, relay station (Relay Node), a terminal with scheduling capabilities, etc.

[0048] 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.

[0049] 1) Resource allocation in the time domain

[0050] 2) Resource allocation in the frequency domain

[0051] 3) Reference synchronization signal (including SLSS (Sidelink Synchronization Signal))

[0052] 4) Reference signal used in path loss measurement for transmit power control

[0053] 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, or OFDM with transform precoding can also be used.

[0054] In the SL of LTE, Mode 3 and Mode 4 are defined for resource allocation of the SL to the terminal 20. In Mode 3, transmission resources are dynamically allocated using DCI (Downlink Control Information) sent from the base station 10 to the terminal 20. In addition, in Mode 3, SPS (SemiPersistent Scheduling) can also be performed. In Mode 4, the terminal 20 autonomously selects transmission resources from a resource pool.

[0055] In addition, the time slot in the embodiment of the present invention may also be replaced by a symbol, a mini-time slot, a subframe, a radio frame, or a TTI (Transmission Time Interval). In addition, the cell in the embodiment of the present invention may also 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), etc.

[0056] Figure 2 This is a diagram for explaining example (1) of the V2X transmission mode. Figure 2 In the transmission mode of the sidelink communication shown in FIG. 1 , in step 1, the base station 10 sends the scheduling information of the sidelink 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 scheduling information (step 2). Figure 2 The transmission mode of the sidelink communication shown is called the sidelink transmission mode 3 in LTE. In the sidelink transmission mode 3 in LTE, the sidelink scheduling based on Uu is performed. Uu refers to the wireless 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.

[0057] 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. 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 performs the resource selection itself.

[0058] Figure 4 This is a diagram for explaining example (3) of the V2X transmission mode. Figure 4 In the transmission mode of the side link communication shown in FIG. 1 , in step 1, terminal 20A transmits PSCCH and PSSCH to terminal 20B using the resources selected autonomously. Similarly, terminal 20B transmits PSCCH and PSSCH to 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.

[0059] 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. 1 , 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.

[0060] Figure 6 This is a diagram for explaining example (5) of the V2X transmission mode. Figure 6 In the transmission mode of the side link communication shown in FIG. 1 , terminal 20A transmits the scheduling of the side link to terminal 20B via PSCCH in step 1. Then, terminal 20B transmits PSSCH to terminal 20A according to the received scheduling (step 2). Figure 6 The transmission mode of the sidelink communication shown is called sidelink transmission mode 2d in NR.

[0061] 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 performs unicast to the terminal 20C.

[0062] 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 sends 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 to the group.

[0063] Fig. 9 This is a diagram for explaining example (3) of the V2X communication type. Fig. 9 The communication type of the side link shown is broadcast. Terminal 20A sends PSCCH and PSSCH to one or more terminals 20. Fig. 9 In the example shown, terminal 20A broadcasts to terminal 20B, terminal 20C, and terminal 20D. Figure 7 to Figure 9 The terminal 20A shown is referred to as a head-UE.

[0064] In addition, in NR-V2X, it is envisaged to support HARQ (Hybrid automatic repeat request) in unicast and multicast of the side link. In addition, in NR-V2X, SFCI (Sidelink Feedback Control Information) including HARQ response is defined. In addition, research is underway to send SFCI via PSFCH (Physical Sidelink Feedback Channel).

[0065] In addition, in the following description, it is assumed that PSFCH is used in the transmission of HARQ-ACK in the side link, but this is only an example. For example, PSCCH can be used to transmit HARQ-ACK in the side link, PSSCH can be used to transmit HARQ-ACK in the side link, and other channels can be used to transmit HARQ-ACK in the side link.

[0066] In the following, for the sake of convenience, all the information reported by the terminal 20 in HARQ is referred to as HARQ-ACK. The HARQ-ACK may also be referred to as HARQ-ACK information. In addition, more specifically, the codebook for the HARQ-ACK information reported from the terminal 20 to the base station 10, etc. is referred to as the HARQ-ACK codebook. The HARQ-ACK codebook specifies the bit string of the HARQ-ACK information. In addition, using "HARQ-ACK", NACK is also sent in addition to ACK.

[0067] Fig.10 FIG. 1 is a diagram showing an example (1) of the structure and operation of a wireless communication system in an embodiment of the present invention. Fig.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. Fig.10 The terminal 20A and the terminal 20B are shown as examples.

[0068] Hereinafter, when the terminals 20A, 20B, etc. are not particularly distinguished, they are simply referred to as "terminal 20" or "user device". Fig.10 In the figure, as an example, the case where both the terminal 20A and the terminal 20B are within the coverage of the cell is shown, but the actions in the embodiment of the present invention can also be applied to the case where the terminal 20B is outside the coverage.

[0069] As described above, in this embodiment, the terminal 20 is a device mounted on a vehicle such as a car, and has a cellular communication function and a side link function as a UE in LTE or NR. The terminal 20 may also be a general portable terminal (smartphone, etc.). In addition, the terminal 20 may also be an RSU. The RSU may be a UE type RSU (UE type RSU) having the function of a UE, or a gNB type RSU (gNB type RSU) having the function of a base station device.

[0070] 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 the various sensors is also the terminal 20 .

[0071] In addition, the processing content of the transmission data of the side link of the terminal 20 is basically the same as the processing content of the UL transmission in LTE or NR. For example, the terminal 20 scrambles the codeword of the transmission data, modulates it to generate complex-valued symbols, maps the complex-valued symbols (transmission signal) to layer 1 or layer 2, and performs precoding. Then, the precoded complex-valued symbols are mapped to resource elements to generate a transmission signal (for example, complex-valued time-domain SC-FDMA signal: complex-valued time-domain SC-FDMA signal), and sent from each antenna port.

[0072] In addition, the base station 10 has a cellular communication function as a base station in LTE or NR, and a function for enabling the terminal 20 in this embodiment to communicate (for example, resource pool setting, resource allocation, etc.). In addition, the base station 10 can also be an RSU (gNB type RSU).

[0073] 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.

[0074] 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 .

[0075] In step S102 and step S103, the terminal 20A uses the resources autonomously selected in step S101 to send SCI (Sidelink Control Information) using PSCCH and to send SL data using PSSCH. For example, the terminal 20A may send SCI (PSCCH) using the same time resources as the time resources of the PSSCH and using frequency resources adjacent to the frequency resources of the PSSCH.

[0076] Terminal 20B receives SCI (PSCCH) and SL data (PSSCH) transmitted from terminal 20A. The SCI received using PSCCH may include information on PSFCH resources for terminal 20B to transmit HARQ-ACK for the received data. Terminal 20A may include information on the resources selected autonomously in SCI and transmit it.

[0077] 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.

[0078] If the HARQ-ACK received in step S104 indicates a request for retransmission, that is, NACK (negative acknowledgement), the terminal 20A retransmits the PSCCH and PSSCH to the terminal 20B in step S105. The terminal 20A can retransmit the PSCCH and PSSCH using the autonomously selected resources.

[0079] In addition, when HARQ control is not performed, step S104 and step S105 may not be performed.

[0080] Fig.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 regardless of HARQ control for improving the transmission success rate or the reach.

[0081] 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 .

[0082] In step S202 and step S203, terminal 20A uses the resources autonomously selected in step S201 to send SCI using PSCCH and to send SL data using PSSCH. For example, terminal 20A can send SCI (PSCCH) using the same time resources as the time resources of PSSCH and frequency resources adjacent to the frequency resources of PSSCH.

[0083] 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.

[0084] In addition, when blind retransmission is not performed, step S204 may not be performed.

[0085] Fig.12 3 is a diagram showing 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 scheduling of the side link. That is, the base station 10 can determine the resources of the side link 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 the resources of the PSFCH to the terminal 20.

[0086] 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 description, DCI for SL scheduling is referred to as SL scheduling DCI (SL scheduling DCI).

[0087] In addition, in step S301, it is assumed that the base station 10 also sends DCI for DL ​​scheduling (also referred to as DL allocation) to the terminal 20A using the PDCCH. Hereinafter, for the sake of convenience, the DCI for DL ​​scheduling is referred to as DL scheduling DCI (DL scheduling DCI). The terminal 20A that receives the DL scheduling DCI uses the resources specified by the DL scheduling DCI to receive DL data using the PDSCH.

[0088] In step S302 and step S303, the terminal 20A uses the resources specified by the SL scheduling DCI to send SCI (Sidelink Control Information) using PSCCH, and sends SL data using PSSCH. In addition, in the SL scheduling DCI, only the resources of PSSCH can be specified. In this case, for example, the terminal 20A can send SCI (PSCCH) using the same time resources as the time resources of PSSCH and using frequency resources adjacent to the frequency resources of PSSCH.

[0089] The terminal 20B receives the SCI (PSCCH) and SL data (PSSCH) transmitted from the terminal 20A. The SCI received using the PSCCH includes information on the resources of the PSFCH for the terminal 20B to transmit HARQ-ACK for reception of the data.

[0090] The information of the resource is included in the DL scheduling DCI or SL scheduling DCI sent from the base station 10 in step S301, and the terminal 20A may also obtain the information of the resource from the DL scheduling DCI or SL scheduling DCI and include it in the SCI. Alternatively, assuming that the DCI sent from the base station 10 does not include the information of the resource, the terminal 20A autonomously includes the information of the resource in the SCI and sends it.

[0091] 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.

[0092] In step S305, the terminal 20A, for example, sends HARQ-ACK at a timing (e.g., timing in time slots) specified by the DL scheduling DCI (or the SL scheduling DCI) using a PUCCH (Physical uplink control channel) resource specified by the DL scheduling DCI (or the SL scheduling DCI), and the base station 10 receives the HARQ-ACK. The codebook of the HARQ-ACK may include the HARQ-ACK received from the terminal 20B and the HARQ-ACK for the DL data. However, in the case where there is no allocation of DL data, etc., the HARQ-ACK for the DL data is not included.

[0093] In addition, when HARQ control is not performed, step S304 and step S305 may not be performed.

[0094] Fig.13It is a diagram showing an action example (4) in an embodiment of the present invention. As described above, the side link of NR supports the case of sending HARQ responses through PSFCH. In addition, the format of PSFCH can use the same format as PUCCH (Physical UplinkControl 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 in the codeword at the end of the time slot or multiple codewords at the end. In addition, a period N is set or predefined for the PSFCH resources. The period N can be set or predefined in units of time slots.

[0095] exist Fig.13 In the , 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 a 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 a time slot, or in multiple symbols at the end of a time slot. Fig.13 In the example shown, three subchannels are set in the 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.

[0096] In the case where the HARQ response in the NR-V2X multicast is option 2 of sending ACK or NACK, it is necessary to determine the resources used for the transmission and reception of the PSFCH. Fig.13 As shown, in step S401, terminal 20A as the transmitting terminal 20 performs multicast to terminal 20B, terminal 20C and terminal 20D as the receiving terminal 20 via SL-SCH. 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. Here, as Fig.13 As shown in the example of , 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.

[0097] Fig.14 is a diagram showing an example (1) of a HARQ response. Fig.12 As shown in step S305, the operation of reporting the HARQ response in the SL to the base station 10 is supported. The number of slots in Uu starting from the timing of the PSFCH at which the HARQ response is transmitted is notified to the terminal 20, thereby determining the timing of the PUCCH.

[0098] The timing of the PUCCH may be notified as X time slots from the PSFCH using a PSFCH-to-HARQ-feedback-timing indicator field included in the DCI or an RRC message. Fig.14 An example is shown in which the timing of the PUCCH is notified to be 2 time slots from the PSFCH. In time slot n, the PDCCH is sent through the Uu carrier. Next, in time slot n+1, the PSCCH and PSSCH are sent through the SL carrier. Next, in time slot n+3, the PSFCH is sent through the SL carrier. Next, since the timing of the PUCCH is 2 time slots from the PSFCH, in time slot n+5, the PUCCH is sent through the Uu carrier. In addition, the time slot length can be defined based on the SCS of the Uu carrier. In addition, the name of the PSFCH-to-HARQ-feedback-timing indicator field is only an example, and the field of the DCI that notifies the offset from the PSFCH to the PUCCH may also be other names.

[0099] In addition, in the embodiment of the present invention, PSFCH may also be replaced by PSCCH / PSSCH. In addition, in the embodiment of the present invention, the carrier on which PDCCH is transmitted / received may be the same as or different from the carrier on which PUCCH is transmitted / received. Uu carrier may also mean any one of a carrier for transmitting DL channels and a carrier for transmitting UL channels.

[0100] In the case of PDSCH-to-HARQ in NR-Uu, the time slot n+X of the PUCCH in which the HARQ response is transmitted is determined based on the terminal of the PDSCH in time slot n. X is set, for example, by the PDSCH-to-HARQ-feedback-timing indicator field included in the DCI.

[0101] Fig.15 is a diagram showing an example of SL scheduling. In the case of SL scheduling by dynamic grant or configured grant type 2, the first SL slot is in the corresponding resource pool no earlier than T DL -T TA / 2×T C +m×T slot Sent.DL is the start time of the time slot carrying the corresponding DCI. TA is the timing advance value. C Indicates the time unit, T C =1 / (Δf max ·N f ), and is Δf max =480·10 3 Hz、N f =4096. m is the time slot offset between the DCI and the initial SL sent by the DCI, and is calculated according to the parameter set of the SL.

[0102] Fig.15 An example of timing in the terminal 20 that specifies SL scheduling when m=1 is shown. DL The beginning of the time slot in which the PDCCH is transmitted. DL -T TA *T C To define, such as Fig.15 As shown, T DL The time intermediate to T1 is T2. After T2 is further added with the time slot offset m to obtain T3, the SL time slot is scheduled. Fig.15 As an example, assume that T TA It is the time domain offset between the Uu carrier and the SL carrier. Here, when there is an offset in the time domain between the Uu carrier and the SL carrier, the scheduled SL time slot is after T3, so compared with the case where the time domain offset between the Uu carrier and the SL carrier is 0, the scheduled SL time slot is configured in the next time slot.

[0103] Fig.16 This is a diagram showing example (2) of a HARQ response. When the synchronization source of the SL carrier is not the base station 10, the base station 10 is unaware of the timing of the SL carrier. Therefore, there may be a difference in the timing of the PUCCH for sending the HARQ response in the SL carrier between the base station 10 and the terminal 20. The case where the synchronization source of the SL carrier is not the base station 10 refers to, for example, the case where the synchronization source of the SL carrier is a GNSS (Global Navigation Satellite System), an eNB or a gNB of another operator.

[0104] like Fig.16 As shown, in the Uu carrier, the following case is considered: it is assumed that the Uu carrier and the SL carrier are synchronized based on the time slot n in which the PDCCH is transmitted, and it is assumed that the base station 10 receives the PUCCH in the time slot n+5 which is 2 time slots after the time slot n+3 corresponding to the PSFCH transmission / reception. On the other hand, in the terminal 20, Fig.15In the case of the timing regulation of SL scheduling taking into account the offset between the Uu carrier and the SL carrier as described in , it is possible to send PUCCH in the slot n+6 after 2 slots in the Uu carrier, starting from the position of the PSFCH in the SL carrier. Therefore, it is necessary to make a correction to make the timing of PUCCH consistent between the base station 10 and the terminal 20.

[0105] Therefore, since the terminal 20 sends the HARQ response of the SL to the base station 10, the response timing is assumed according to the specific offset for the offset from the PSFCH to the PUCCH that is set or notified, and the HARQ response of the SL is sent to the base station 10 at the response timing. The offset can mean any information in the time direction, such as the number of time slots.

[0106] Fig.17 1 is a diagram showing an example (1) of a HARQ response in an embodiment of the present invention. Fig.17 As shown, offset A is the time domain offset between the Uu carrier and the SL carrier on the terminal 20 side. Offset A can also be the time domain offset between the time slot boundary of the Uu carrier on the terminal 20 side and the time slot boundary of the SL carrier. Offset B is the time domain offset between the scheduled SL transmission timing and the actually scheduled SL transmission timing when offset A on the terminal 20 side is set to 0.

[0107] like Fig.17 As shown in FIG. 1 , the response timing can be determined starting from the time slot of the Uu carrier corresponding to the time offset B in advance from the start time of the corresponding PSFCH. Alternatively, the response timing can be determined starting from the time slot of the Uu carrier corresponding to the time offset B in advance from the end time or middle time of the PSFCH. Fig.17 As shown, the PUCCH is transmitted in a slot two slots later than the slot of the Uu carrier set as the start point, which is the notified offset from the PSFCH to the PUCCH.

[0108] Fig.18 is a diagram showing an example (2) of a HARQ response in an embodiment of the present invention. Fig.17 same, Fig.18 The offset A shown is the time domain offset between the Uu carrier and the SL carrier on the terminal 20 side. The offset B is the time domain offset between the scheduled SL transmission timing when the offset A on the terminal 20 side is set to 0 and the actually scheduled SL transmission timing.

[0109] like Fig.18As shown, the response timing can be determined starting from the time slot of the Uu carrier corresponding to the time when the offset A is pushed back from the start time of the corresponding PSFCH. In addition, the response timing can also be determined starting from the time slot of the Uu carrier corresponding to the time when the offset A is pushed back from the end time or middle time of the PSFCH.

[0110] For example, in the case of offset A>0, if Fig.18 As shown, the PUCCH can be transmitted in a time slot after 1 time slot obtained by subtracting 1 time slot from 2 time slots as the notified offset from PSFCH to PUCCH, starting from the time slot of the Uu carrier set as the starting point. That is, when the notified offset from PSFCH to PUCCH is X time slots, the response timing can be set after X-1 time slots. In addition, for example, when the offset A=0, the PUCCH can be transmitted in a time slot after 2 time slots as the notified offset from PSFCH to PUCCH, starting from the time slot of the Uu carrier set as the starting point. That is, when the notified offset from PSFCH to PUCCH is X time slots, the response timing can be set after X time slots.

[0111] In addition, when the offset A>0, the PUCCH can be transmitted in a time slot after 2 time slots as the notified offset from the PSFCH to the PUCCH from the time slot of the Uu carrier set as the starting point. That is, when the notified offset from the PSFCH to the PUCCH is set to X time slots, the response timing can be set after X time slots. In the case of A=0, the PUCCH can be transmitted in a time slot after 3 time slots obtained by adding 1 time slot to 2 time slots as the notified offset from the PSFCH to the PUCCH from the time slot of the Uu carrier set as the starting point. That is, when the notified offset from the PSFCH to the PUCCH is set to X time slots, the response timing can be set after X+1 time slots.

[0112] Fig.19 This is a diagram showing an example (3) of a HARQ response in an embodiment of the present invention. The response timing can be determined starting from the time slot of the Uu carrier corresponding to "the timing of the PSFCH corresponding to the scheduled SL resource assuming that offset A is 0". It can be assumed that offset A is 0, and further that offset B is 0. In addition, offset A being 0 refers to the case where the timing of UL and SL are consistent.

[0113] like Fig.19 As shown, assuming that offset A (and / or offset B) is 0, the slot three slots after the slot in which the PDCCH of the Uu carrier is transmitted becomes the slot set as the starting point.

[0114] Fig. 20is a diagram showing an example (4) of a HARQ response in an embodiment of the present invention. Fig.19 After determining the time slot to be set as the starting point as shown, Fig. 20 As shown, the PUCCH is transmitted in a slot after 2 slots which is the notified offset from the PSFCH to the PUCCH.

[0115] In addition, the “PSFCH corresponding to the HARQ response” may refer to the PSFCH corresponding to the last SL resource among one or more SL resources scheduled by the corresponding DCI.

[0116] In addition, the timing advance value between DL and UL may be considered. For example, in the case of a UL time slot, it may be replaced with a DL time slot, and the time domain position of the UL time slot set as the starting point may be obtained by applying the timing advance value.

[0117] In addition, since the terminal 20 sends the HARQ response of the SL to the base station 10, the response timing can be determined by setting a specific offset to 0 for the offset from the PSFCH to the PUCCH that is set or notified. When the specific offset is set to 0, the terminal 20 can report the offset A and / or the offset B to the base station 10. The report can be performed through any one of the PHY layer, the MAC layer, or the RRC layer, but is not limited thereto.

[0118] In addition, the offset A can be defined as a value that must be greater than 0. That is, the time from the time slot boundary of the SL carrier to the time slot boundary of the Uu carrier after the time slot boundary can be defined as the offset A. Alternatively, the offset A can also be defined as a value that is also allowed to be less than 0. A negative value can also mean that the time slot boundary of the SL carrier is located later than the time slot boundary of the Uu carrier.

[0119] According to the above-described embodiment, it is possible to make the transmission and reception timing of the PUCCH on which the HARQ response is transmitted in the side link consistent between the base station 10 and the terminal 20 .

[0120] That is, it is possible to adjust the timing at which a HARQ (Hybrid automatic repeat request) response in the D2D communication is transmitted in the uplink.

[0121] (Device Structure)

[0122] Next, the functional configuration examples of the base station 10 and the terminal 20 that perform the above-described processing and operation are described. The base station 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions in the embodiments.

[0123] <Base station 10>

[0124] Fig.21 1 is a diagram showing an example of the functional configuration of the base station 10. Fig.21 As shown, the base station 10 includes a transmission unit 110 , a reception unit 120 , a setting unit 130 , and a control unit 140 . Fig.21 The functional configuration shown is only an example, and any functional division and name of the functional unit may be used as long as the operation involved in the embodiment of the present invention can be performed.

[0125] The transmitting unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and obtaining, for example, higher layer information from the received signals. In addition, the transmitting unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL reference signals, etc. to the terminal 20.

[0126] The setting unit 130 stores the preset setting information and various setting information to be transmitted 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 the D2D communication.

[0127] As described in the embodiment, the control unit 140 performs processing related to the setting for the terminal 20 to perform D2D communication. In addition, the control unit 140 sends the scheduling of D2D communication and DL communication to the terminal 20 via the transmission unit 110. In addition, the control unit 140 receives information related to the HARQ response of the D2D communication and DL communication from the terminal 20 via the reception unit 120. The functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120.

[0128] <Terminal 20>

[0129] Fig. 22 2 is a diagram showing an example of the functional structure of the terminal 20. Fig. 22 As shown, the terminal 20 includes a transmitting unit 210 , a receiving unit 220 , a setting unit 230 , and a control unit 240 . Fig. 22 The functional configuration shown is only an example, and any functional division and name of the functional unit may be used as long as the operation involved in the embodiment of the present invention can be performed.

[0130] The transmitting unit 210 generates a transmission signal according to the transmission data, and transmits the transmission signal wirelessly. The receiving unit 220 receives various signals wirelessly, and obtains a higher layer signal from the received physical layer signal. In addition, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals or reference signals, etc. 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.

[0131] The setting unit 230 stores various setting information received by the receiving unit 220 from the base station 10 or the terminal 20 in the storage device, and reads it from the storage device as needed. In addition, the setting unit 230 also stores pre-set setting information. The content of the setting information is, for example, information related to the setting of D2D communication.

[0132] As described in the embodiment, the control unit 240 controls the D2D communication with other terminals 20. In addition, the control unit 240 performs processing related to HARQ of D2D communication and DL communication. In addition, the control unit 240 sends information related to HARQ responses of D2D communication and DL communication scheduled from the base station 10 to the base station 10. In addition, the control unit 240 can also schedule D2D communication for other terminals 20. In addition, the control unit 240 can autonomously select resources used in D2D communication from the resource selection window. In addition, the control unit 240 performs processing related to MCS in the transmission and reception of D2D communication. The functional unit related to signal transmission in the control unit 240 can also be included in the transmitting unit 210, and the functional unit related to signal reception in the control unit 240 can also be included in the receiving unit 220.

[0133] (Hardware Structure)

[0134] The block diagram used in the description of the above embodiment ( Fig.21 and Fig. 22) 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 two or more physically or logically separated devices can be directly or indirectly connected (for example, using wires, wirelessly, etc.) and implemented 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.

[0135] Functions include, but are not limited to, judging, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. For example, a functional block (structural part) that enables the transmission function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0136] 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. Fig.23 1 is a diagram showing an example of the hardware structure of a base station 10 and a terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above may 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.

[0137] In the following description, the word "device" may be replaced by "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 figure, or may exclude some of the devices.

[0138] Each function in the base station 10 and the terminal 20 is implemented by the following method: predetermined software (program) is read 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.

[0139] The processor 1001 controls the entire computer by, for example, running an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, the control unit 140, the control unit 240, etc., may also be implemented by the processor 1001.

[0140] 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 accordingly. As a program, a program that causes the computer to execute at least a part of the actions described in the above-mentioned embodiments is used. For example, Fig.21 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. In addition, for example, Fig. 22 The control unit 240 of the terminal 20 shown can also be implemented by a control program stored in the storage device 1002 and running in the processor 1001. Regarding the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by more than one chip. In addition, the program can also be sent from the network via a telecommunication line.

[0141] The storage device 1002 is a computer-readable recording medium, and may be composed of at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, a cache, a main memory (main storage device), etc. The storage device 1002 can store programs (program codes), software modules, etc. that can be executed to implement the communication method involved in one embodiment of the present disclosure.

[0142] The auxiliary storage device 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (CompactDisc 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 strip, etc. The above-mentioned storage medium may be, for example, a database, a server, and other appropriate media including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0143] The communication device 1004 is hardware (transceiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, a transceiver antenna, an amplifier, a transceiver, a transmission path interface, etc. may also be implemented by the communication device 1004. The transceiver may also be physically or logically installed separately from the transmitter and the receiver.

[0144] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0145] In addition, the processor 1001 and the storage device 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured by a single bus or may be configured by different buses between the devices.

[0146] In addition, 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 a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0147] (Summary of Implementation Methods)

[0148] As described above, according to an embodiment of the present invention, there is provided a terminal comprising: a receiving unit, which receives a response related to retransmission control from another terminal via a first channel for transmitting and receiving responses related to retransmission control; a control unit, which receives information indicating a first offset from a base station, the first offset being an offset in the time domain from the first channel to a second channel for transmitting the response related to retransmission control to the base station; and a sending unit, which sends the response related to retransmission control to the base station via the second channel, the control unit determining a time domain position of the second channel based on the first offset and a second offset applied at the time domain position of the first channel that determines a starting point of the first offset.

[0149] The above configuration can make the transmission and reception timing of the PUCCH for transmitting the HARQ response in the sidelink consistent between the base station 10 and the terminal 20. That is, the timing for transmitting the HARQ (Hybrid automatic repeat request) response in the uplink in D2D communication can be adjusted.

[0150] The second offset may be an offset between a time slot of a carrier configuring the first channel and a time slot of a carrier configuring the second channel. According to this structure, the transmission and reception timing of the PUCCH to which the HARQ response in the side link is sent can be made consistent between the base station 10 and the terminal 20 according to the offset between the side link and the uplink.

[0151] The position obtained by adding the second offset to the time domain position of the first channel can be set as the starting point of the first offset. According to this structure, the transmission and reception timing of the PUCCH to which the HARQ response is sent in the side link can be made consistent between the base station 10 and the terminal 20 according to the offset between the side link and the uplink.

[0152] The second offset may be a time domain offset between resources in the carrier configured with the first channel that are scheduled under the assumption that the offset between the time slot of the carrier configured with the first channel and the time slot of the carrier configured with the second channel is 0 and the actually scheduled resources. According to this structure, the transmission and reception timing of the PUCCH to which the HARQ response in the side link is sent can be made consistent between the base station 10 and the terminal 20 according to the offset between the side link and the uplink.

[0153] The position obtained by subtracting the second offset from the time domain position of the first channel can be set as the starting point of the first offset. According to this structure, the transmission and reception timing of the PUCCH to which the HARQ response is sent in the side link can be made consistent between the base station 10 and the terminal 20 according to the offset between the side link and the uplink.

[0154] In addition, according to an embodiment of the present invention, a communication method is provided, in which a terminal performs the following steps: a receiving step of receiving a response related to retransmission control from another terminal via a first channel used for transmitting and receiving responses related to retransmission control; a controlling step of receiving information representing a first offset from a base station, the first offset being an offset in the time domain from the first channel to a second channel for transmitting the response related to retransmission control to the base station; and a sending step of transmitting the response related to retransmission control to the base station via the second channel, the controlling step including a step of determining a time domain position of the second channel based on the first offset and a second offset applied at the time domain position of the first channel that determines a starting point of the first offset.

[0155] The above configuration can make the transmission and reception timing of the PUCCH for transmitting the HARQ response in the sidelink consistent between the base station 10 and the terminal 20. That is, the timing for transmitting the HARQ (Hybrid automatic repeat request) response in the uplink in D2D communication can be adjusted.

[0156] (Supplementary Implementation Methods)

[0157] 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 promote the understanding of the invention, specific numerical examples are used for description, but unless otherwise specified, these numerical values ​​are only examples, and any appropriate value may also be used. The distinction between the items in the above description is not essential to the present invention, and the items recorded in more than two items can be used in combination as needed, and the items recorded in a certain item can be applied to the items 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 process described in the embodiment, the order of processing can be swapped if there is no contradiction. In order to facilitate the description of the processing, the base station 10 and the terminal 20 are described using functional block diagrams, but such devices can also be implemented in hardware, software, or a combination thereof. The software that operates through the processor of the base station 10 according to the embodiment of the present invention and the software that operates through the processor of the terminal 20 according to the embodiment of the present invention may 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.

[0158] 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 also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0159] Each form / implementation described in the present 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. In addition, a combination of a plurality of systems (for example, a combination of at least one of LTE and LTE-A with 5G, etc.) may be applied.

[0160] The processing procedures, timings, flows, etc. of each form / implementation described in this specification may be changed in order without contradiction. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0161] In this specification, a specific action that is assumed to be performed by the base station 10 may also be performed by its upper node depending on the situation. In a network composed of one or more network nodes having the base station 10, various actions performed to communicate with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station 10 is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0162] The information or signals described in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and can also be input or output via a plurality of network nodes.

[0163] The input or output information can be stored in a specific location (e.g., memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0164] The determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0165] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0166] In addition, software, commands, information, etc. may be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0167] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0168] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0169] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0170] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0171] The names used for the above parameters are not limiting in any way. Furthermore, the formulas etc. 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 all appropriate names, the various names assigned to these various channels and information elements are not limiting in any way.

[0172] In the present disclosure, the terms "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", "component carrier" and the like are used interchangeably. Sometimes, the base station is also referred to as macro cell, small cell, femto cell, pico cell and the like.

[0173] A base station can accommodate one or more (for example, 3) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can 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 part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provide communication services within the coverage area.

[0174] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0175] For mobile stations, those skilled in the art sometimes also use the following terms: 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.

[0176] 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 means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves in an unmanned manner (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.

[0177] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, with respect to a structure in which the communication between a base station and a user terminal is replaced by the 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 that the terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, the terms "uplink" and "downlink" may also be replaced by terms corresponding to the communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may also be replaced by a side channel.

[0178] 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.

[0179] The terms "determining" and "determining" used in the present disclosure sometimes also include a variety of actions. "Judgment" and "determination" may include, for example, considering matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) as matters that have been "judged" or "determined", etc. In addition, "judgment" and "determination" may include matters that have been received (for example, receiving information), transmitted (for example, sending information), input, output, accessed (for example, accessing data in memory) as matters that have been "judged" or "determined", etc. In addition, "judgment" and "determination" may include matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. as matters that have been "judged" or "determined". That is, "judgment" and "decision" may include any action that is considered to be "judged" or "decided". In addition, "judgment (decision)" may be replaced by "assuming", "expecting", "considering", etc.

[0180] 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 to replace "connection". In the context of the present 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 (both visible and invisible) region may be used to "connect" or "couple" to each other.

[0181] The reference signal may be referred to as RS (Reference Signal) for short, or may be referred to as a pilot signal according to the applied standard.

[0182] The phrase "according to" used in the present 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".

[0183] Any reference to an element using the designations "first," "second," etc. 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 method of distinguishing between two or more elements. Therefore, a reference to a first element and a second element does not mean that only two elements can be taken or that the first element must precede the second element in any form.

[0184] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section”, “circuit”, “device” or the like.

[0185] When the terms "include", "including" and their variations are used in the present disclosure, these terms are intended to be inclusive like the term "comprising". Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0186] A radio frame may be composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as subframes. A subframe may further be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is independent of a numerology.

[0187] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, and the like.

[0188] 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.

[0189] A time slot may contain multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in units of time greater than a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type B.

[0190] A radio frame, a subframe, a time slot, a mini-time slot, and a symbol all represent time units for transmitting signals. A radio frame, a subframe, a time slot, a mini-time slot, and a symbol may be referred to by other corresponding names.

[0191] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, and one time slot or one mini time slot may be called a TTI. That is, at least one of a subframe and a TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. In addition, the unit representing a TTI may not be called a subframe, but a time slot, a mini time slot, etc.

[0192] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each terminal 20 to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each terminal 20) in units of TTI. In addition, the definition of TTI is not limited to this.

[0193] TTI can be a transmission time unit for data packets (transport blocks), code blocks, code words, etc. after channel coding, and can also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which the transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0194] In addition, when 1 time slot or 1 mini time slot is called TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can constitute the minimum time unit of scheduling. In addition, the number of time slots (number of mini time slots) constituting the minimum time unit of scheduling can be controlled.

[0195] A TTI having 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 mini-time slot, a sub-time slot, a time slot, etc.

[0196] In addition, for a long TTI (for example, a normal TTI, a subframe, etc.), it can be replaced with a TTI having a time length exceeding 1ms, and for a short TTI (for example, a shortened TTI, etc.), it can be replaced with a TTI length that is smaller than the long TTI (longTTI) and has a TTI length of more than 1ms.

[0197] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers contained in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers contained in an RB may also be determined according to the parameter set.

[0198] In addition, the time domain of an RB may include one or more symbols, and may be the length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. may be composed of one or more resource blocks, respectively.

[0199] 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.

[0200] In addition, a resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

[0201] A bandwidth part (BWP) (which may be referred to as a partial bandwidth, etc.) may represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, the common RBs may be identified by the index of the RBs relative to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0202] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be set for the terminal 20 within one carrier.

[0203] At least one of the set BWPs may be active, and it is not assumed that the terminal 20 transmits and receives a predetermined signal / channel outside the activated BWP. In addition, "cell", "carrier" and the like in the present disclosure may be replaced with "BWP".

[0204] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP: Cyclic Prefix) length, and the like can be changed in various ways.

[0205] In the present disclosure, when an article is added by translation, such as a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in a plural form.

[0206] In the present disclosure, the term "A and B are different" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0207] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched according to execution. In addition, notification of scheduled information is not limited to being performed explicitly (e.g., notification of "yes X"), but may also be performed implicitly (e.g., notification of the scheduled information is not performed).

[0208] In addition, the HARQ response of the present disclosure is an example of a response related to retransmission control. PSSCH is an example of a physical shared channel. PSFCH is an example of a channel for transmitting and receiving a response related to retransmission control. PSCCH is an example of a physical control channel.

[0209] The present disclosure is described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0210] Description of symbols

[0211] 10: Base station;

[0212] 110: Sending department;

[0213] 120: receiving unit;

[0214] 130: Setting department;

[0215] 140: Control Department;

[0216] 20: Terminal;

[0217] 210: Sending department;

[0218] 220: receiving unit;

[0219] 230: Setting department;

[0220] 240: Control Department;

[0221] 1001: processor;

[0222] 1002: storage device;

[0223] 1003: auxiliary storage device;

[0224] 1004: Communication devices;

[0225] 1005: input device;

[0226] 1006: Output device.

Claims

1. A terminal comprising: a receiving unit that receives a response related to retransmission control from another terminal via the first channel; a transmitting unit configured to transmit the response related to the retransmission control to the base station via the second channel; as well as A control unit specifies a time slot for allocating the second channel assuming that the timing of the frame for allocating the first channel is not offset from the timing of the frame for allocating the downlink channel even when the frame for allocating the first channel and the frame for allocating the second channel are not aligned.

2. The terminal according to claim 1, wherein: The control unit receives information indicating an offset in the time domain from the first channel to the second channel from the base station.

3. A communication method performed by a terminal, wherein: The communication method comprises the following steps: receiving a response related to retransmission control from another terminal via the first channel; sending the response related to the retransmission control to the base station via the second channel; as well as Even when the frame configuring the first channel and the frame configuring the second channel are not aligned, the time slot configuring the second channel is specified assuming that the timing of the frame configuring the first channel is not offset from the timing of the frame configuring the downlink channel.

4. A communication system comprising a terminal and a base station, wherein: The terminal has: a receiving unit that receives a response related to retransmission control from another terminal via the first channel; a transmitting unit configured to transmit the response related to the retransmission control to the base station via the second channel; as well as a control unit for specifying a time slot for configuring the second channel on the assumption that the timing of the frame configuring the first channel is not offset from the timing of the frame configuring the downlink channel even when the frame configuring the first channel is not aligned with the frame configuring the second channel, The base station receives the response related to retransmission control from the terminal via the second channel.

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